text: /*!
   * FullCalendar v3.2.0
   * Docs & License: https://fullcalendar.io/
   * (c) 2017 Adam Shaw
   */
  
  (function (factory) {
      if (typeof define === 'function' && define.amd) {
          define(['jquery', 'moment'], factory);
      }
      else if (typeof exports === 'object') { // Node/CommonJS
          module.exports = factory(require('jquery'), require('moment'));
      }
      else {
          factory(jQuery, moment);
      }
  })(function ($, moment) {
  
      ;
      ;
  
      var FC = $.fullCalendar = {
          version: "3.2.0",
          // When introducing internal API incompatibilities (where fullcalendar plugins would break),
          // the minor version of the calendar should be upped (ex: 2.7.2 -> 2.8.0)
          // and the below integer should be incremented.
          internalApiVersion: 8
      };
      var fcViews = FC.views = {};
  
  
      $.fn.fullCalendar = function (options) {
          var args = Array.prototype.slice.call(arguments, 1); // for a possible method call
          var res = this; // what this function will return (this jQuery object by default)
  
          this.each(function (i, _element) { // loop each DOM element involved
              var element = $(_element);
              var calendar = element.data('fullCalendar'); // get the existing calendar object (if any)
              var singleRes; // the returned value of this single method call
  
              // a method call
              if (typeof options === 'string') {
                  if (calendar && $.isFunction(calendar[options])) {
                      singleRes = calendar[options].apply(calendar, args);
                      if (!i) {
                          res = singleRes; // record the first method call result
                      }
                      if (options === 'destroy') { // for the destroy method, must remove Calendar object data
                          element.removeData('fullCalendar');
                      }
                  }
              }
              // a new calendar initialization
              else if (!calendar) { // don't initialize twice
                  calendar = new Calendar(element, options);
                  element.data('fullCalendar', calendar);
                  calendar.render();
              }
          });
  
          return res;
      };
  
  
      var complexOptions = [ // names of options that are objects whose properties should be combined
          'header',
          'footer',
          'buttonText',
          'buttonIcons',
          'themeButtonIcons'
      ];
  
  
  // Merges an array of option objects into a single object
      function mergeOptions(optionObjs) {
          return mergeProps(optionObjs, complexOptions);
      }
  
      ;
      ;
  
  // exports
      FC.intersectRanges = intersectRanges;
      FC.applyAll = applyAll;
      FC.debounce = debounce;
      FC.isInt = isInt;
      FC.htmlEscape = htmlEscape;
      FC.cssToStr = cssToStr;
      FC.proxy = proxy;
      FC.capitaliseFirstLetter = capitaliseFirstLetter;
  
  
      /* FullCalendar-specific DOM Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
  
  // Given the scrollbar widths of some other container, create borders/margins on rowEls in order to match the left
  // and right space that was offset by the scrollbars. A 1-pixel border first, then margin beyond that.
      function compensateScroll(rowEls, scrollbarWidths) {
          if (scrollbarWidths.left) {
              rowEls.css({
                  'border-left-width': 1,
                  'margin-left': scrollbarWidths.left - 1
              });
          }
          if (scrollbarWidths.right) {
              rowEls.css({
                  'border-right-width': 1,
                  'margin-right': scrollbarWidths.right - 1
              });
          }
      }
  
  
  // Undoes compensateScroll and restores all borders/margins
      function uncompensateScroll(rowEls) {
          rowEls.css({
              'margin-left': '',
              'margin-right': '',
              'border-left-width': '',
              'border-right-width': ''
          });
      }
  
  
  // Make the mouse cursor express that an event is not allowed in the current area
      function disableCursor() {
          $('body').addClass('fc-not-allowed');
      }
  
  
  // Returns the mouse cursor to its original look
      function enableCursor() {
          $('body').removeClass('fc-not-allowed');
      }
  
  
  // Given a total available height to fill, have `els` (essentially child rows) expand to accomodate.
  // By default, all elements that are shorter than the recommended height are expanded uniformly, not considering
  // any other els that are already too tall. if `shouldRedistribute` is on, it considers these tall rows and
  // reduces the available height.
      function distributeHeight(els, availableHeight, shouldRedistribute) {
  
          // *FLOORING NOTE*: we floor in certain places because zoom can give inaccurate floating-point dimensions,
          // and it is better to be shorter than taller, to avoid creating unnecessary scrollbars.
  
          var minOffset1 = Math.floor(availableHeight / els.length); // for non-last element
          var minOffset2 = Math.floor(availableHeight - minOffset1 * (els.length - 1)); // for last element *FLOORING NOTE*
          var flexEls = []; // elements that are allowed to expand. array of DOM nodes
          var flexOffsets = []; // amount of vertical space it takes up
          var flexHeights = []; // actual css height
          var usedHeight = 0;
  
          undistributeHeight(els); // give all elements their natural height
  
          // find elements that are below the recommended height (expandable).
          // important to query for heights in a single first pass (to avoid reflow oscillation).
          els.each(function (i, el) {
              var minOffset = i === els.length - 1 ? minOffset2 : minOffset1;
              var naturalOffset = $(el).outerHeight(true);
  
              if (naturalOffset < minOffset) {
                  flexEls.push(el);
                  flexOffsets.push(naturalOffset);
                  flexHeights.push($(el).height());
              }
              else {
                  // this element stretches past recommended height (non-expandable). mark the space as occupied.
                  usedHeight += naturalOffset;
              }
          });
  
          // readjust the recommended height to only consider the height available to non-maxed-out rows.
          if (shouldRedistribute) {
              availableHeight -= usedHeight;
              minOffset1 = Math.floor(availableHeight / flexEls.length);
              minOffset2 = Math.floor(availableHeight - minOffset1 * (flexEls.length - 1)); // *FLOORING NOTE*
          }
  
          // assign heights to all expandable elements
          $(flexEls).each(function (i, el) {
              var minOffset = i === flexEls.length - 1 ? minOffset2 : minOffset1;
              var naturalOffset = flexOffsets[i];
              var naturalHeight = flexHeights[i];
              var newHeight = minOffset - (naturalOffset - naturalHeight); // subtract the margin/padding
  
              if (naturalOffset < minOffset) { // we check this again because redistribution might have changed things
                  $(el).height(newHeight);
              }
          });
      }
  
  
  // Undoes distrubuteHeight, restoring all els to their natural height
      function undistributeHeight(els) {
          els.height('');
      }
  
  
  // Given `els`, a jQuery set of <td> cells, find the cell with the largest natural width and set the widths of all the
  // cells to be that width.
  // PREREQUISITE: if you want a cell to take up width, it needs to have a single inner element w/ display:inline
      function matchCellWidths(els) {
          var maxInnerWidth = 0;
  
          els.find('> *').each(function (i, innerEl) {
              var innerWidth = $(innerEl).outerWidth();
              if (innerWidth > maxInnerWidth) {
                  maxInnerWidth = innerWidth;
              }
          });
  
          maxInnerWidth++; // sometimes not accurate of width the text needs to stay on one line. insurance
  
          els.width(maxInnerWidth);
  
          return maxInnerWidth;
      }
  
  
  // Given one element that resides inside another,
  // Subtracts the height of the inner element from the outer element.
      function subtractInnerElHeight(outerEl, innerEl) {
          var both = outerEl.add(innerEl);
          var diff;
  
          // effin' IE8/9/10/11 sometimes returns 0 for dimensions. this weird hack was the only thing that worked
          both.css({
              position: 'relative', // cause a reflow, which will force fresh dimension recalculation
              left: -1 // ensure reflow in case the el was already relative. negative is less likely to cause new scroll
          });
          diff = outerEl.outerHeight() - innerEl.outerHeight(); // grab the dimensions
          both.css({position: '', left: ''}); // undo hack
  
          return diff;
      }
  
  
      /* Element Geom Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
      FC.getOuterRect = getOuterRect;
      FC.getClientRect = getClientRect;
      FC.getContentRect = getContentRect;
      FC.getScrollbarWidths = getScrollbarWidths;
  
  
  // borrowed from https://github.com/jquery/jquery-ui/blob/1.11.0/ui/core.js#L51
      function getScrollParent(el) {
          var position = el.css('position'),
              scrollParent = el.parents().filter(function () {
                  var parent = $(this);
                  return (/(auto|scroll)/).test(
                      parent.css('overflow') + parent.css('overflow-y') + parent.css('overflow-x')
                  );
              }).eq(0);
  
          return position === 'fixed' || !scrollParent.length ? $(el[0].ownerDocument || document) : scrollParent;
      }
  
  
  // Queries the outer bounding area of a jQuery element.
  // Returns a rectangle with absolute coordinates: left, right (exclusive), top, bottom (exclusive).
  // Origin is optional.
      function getOuterRect(el, origin) {
          var offset = el.offset();
          var left = offset.left - (origin ? origin.left : 0);
          var top = offset.top - (origin ? origin.top : 0);
  
          return {
              left: left,
              right: left + el.outerWidth(),
              top: top,
              bottom: top + el.outerHeight()
          };
      }
  
  
  // Queries the area within the margin/border/scrollbars of a jQuery element. Does not go within the padding.
  // Returns a rectangle with absolute coordinates: left, right (exclusive), top, bottom (exclusive).
  // Origin is optional.
  // NOTE: should use clientLeft/clientTop, but very unreliable cross-browser.
      function getClientRect(el, origin) {
          var offset = el.offset();
          var scrollbarWidths = getScrollbarWidths(el);
          var left = offset.left + getCssFloat(el, 'border-left-width') + scrollbarWidths.left - (origin ? origin.left : 0);
          var top = offset.top + getCssFloat(el, 'border-top-width') + scrollbarWidths.top - (origin ? origin.top : 0);
  
          return {
              left: left,
              right: left + el[0].clientWidth, // clientWidth includes padding but NOT scrollbars
              top: top,
              bottom: top + el[0].clientHeight // clientHeight includes padding but NOT scrollbars
          };
      }
  
  
  // Queries the area within the margin/border/padding of a jQuery element. Assumed not to have scrollbars.
  // Returns a rectangle with absolute coordinates: left, right (exclusive), top, bottom (exclusive).
  // Origin is optional.
      function getContentRect(el, origin) {
          var offset = el.offset(); // just outside of border, margin not included
          var left = offset.left + getCssFloat(el, 'border-left-width') + getCssFloat(el, 'padding-left') -
              (origin ? origin.left : 0);
          var top = offset.top + getCssFloat(el, 'border-top-width') + getCssFloat(el, 'padding-top') -
              (origin ? origin.top : 0);
  
          return {
              left: left,
              right: left + el.width(),
              top: top,
              bottom: top + el.height()
          };
      }
  
  
  // Returns the computed left/right/top/bottom scrollbar widths for the given jQuery element.
  // NOTE: should use clientLeft/clientTop, but very unreliable cross-browser.
      function getScrollbarWidths(el) {
          var leftRightWidth = el.innerWidth() - el[0].clientWidth; // the paddings cancel out, leaving the scrollbars
          var bottomWidth = el.innerHeight() - el[0].clientHeight; // "
          var widths;
  
          leftRightWidth = sanitizeScrollbarWidth(leftRightWidth);
          bottomWidth = sanitizeScrollbarWidth(bottomWidth);
  
          widths = {left: 0, right: 0, top: 0, bottom: bottomWidth};
  
          if (getIsLeftRtlScrollbars() && el.css('direction') == 'rtl') { // is the scrollbar on the left side?
              widths.left = leftRightWidth;
          }
          else {
              widths.right = leftRightWidth;
          }
  
          return widths;
      }
  
  
  // The scrollbar width computations in getScrollbarWidths are sometimes flawed when it comes to
  // retina displays, rounding, and IE11. Massage them into a usable value.
      function sanitizeScrollbarWidth(width) {
          width = Math.max(0, width); // no negatives
          width = Math.round(width);
          return width;
      }
  
  
  // Logic for determining if, when the element is right-to-left, the scrollbar appears on the left side
  
      var _isLeftRtlScrollbars = null;
  
      function getIsLeftRtlScrollbars() { // responsible for caching the computation
          if (_isLeftRtlScrollbars === null) {
              _isLeftRtlScrollbars = computeIsLeftRtlScrollbars();
          }
          return _isLeftRtlScrollbars;
      }
  
      function computeIsLeftRtlScrollbars() { // creates an offscreen test element, then removes it
          var el = $('<div><div/></div>')
              .css({
                  position: 'absolute',
                  top: -1000,
                  left: 0,
                  border: 0,
                  padding: 0,
                  overflow: 'scroll',
                  direction: 'rtl'
              })
              .appendTo('body');
          var innerEl = el.children();
          var res = innerEl.offset().left > el.offset().left; // is the inner div shifted to accommodate a left scrollbar?
          el.remove();
          return res;
      }
  
  
  // Retrieves a jQuery element's computed CSS value as a floating-point number.
  // If the queried value is non-numeric (ex: IE can return "medium" for border width), will just return zero.
      function getCssFloat(el, prop) {
          return parseFloat(el.css(prop)) || 0;
      }
  
  
      /* Mouse / Touch Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
      FC.preventDefault = preventDefault;
  
  
  // Returns a boolean whether this was a left mouse click and no ctrl key (which means right click on Mac)
      function isPrimaryMouseButton(ev) {
          return ev.which == 1 && !ev.ctrlKey;
      }
  
  
      function getEvX(ev) {
          var touches = ev.originalEvent.touches;
  
          // on mobile FF, pageX for touch events is present, but incorrect,
          // so, look at touch coordinates first.
          if (touches && touches.length) {
              return touches[0].pageX;
          }
  
          return ev.pageX;
      }
  
  
      function getEvY(ev) {
          var touches = ev.originalEvent.touches;
  
          // on mobile FF, pageX for touch events is present, but incorrect,
          // so, look at touch coordinates first.
          if (touches && touches.length) {
              return touches[0].pageY;
          }
  
          return ev.pageY;
      }
  
  
      function getEvIsTouch(ev) {
          return /^touch/.test(ev.type);
      }
  
  
      function preventSelection(el) {
          el.addClass('fc-unselectable')
              .on('selectstart', preventDefault);
      }
  
  
      function allowSelection(el) {
          el.removeClass('fc-unselectable')
              .off('selectstart', preventDefault);
      }
  
  
  // Stops a mouse/touch event from doing it's native browser action
      function preventDefault(ev) {
          ev.preventDefault();
      }
  
  
      /* General Geometry Utils
  ----------------------------------------------------------------------------------------------------------------------*/
  
      FC.intersectRects = intersectRects;
  
  // Returns a new rectangle that is the intersection of the two rectangles. If they don't intersect, returns false
      function intersectRects(rect1, rect2) {
          var res = {
              left: Math.max(rect1.left, rect2.left),
              right: Math.min(rect1.right, rect2.right),
              top: Math.max(rect1.top, rect2.top),
              bottom: Math.min(rect1.bottom, rect2.bottom)
          };
  
          if (res.left < res.right && res.top < res.bottom) {
              return res;
          }
          return false;
      }
  
  
  // Returns a new point that will have been moved to reside within the given rectangle
      function constrainPoint(point, rect) {
          return {
              left: Math.min(Math.max(point.left, rect.left), rect.right),
              top: Math.min(Math.max(point.top, rect.top), rect.bottom)
          };
      }
  
  
  // Returns a point that is the center of the given rectangle
      function getRectCenter(rect) {
          return {
              left: (rect.left + rect.right) / 2,
              top: (rect.top + rect.bottom) / 2
          };
      }
  
  
  // Subtracts point2's coordinates from point1's coordinates, returning a delta
      function diffPoints(point1, point2) {
          return {
              left: point1.left - point2.left,
              top: point1.top - point2.top
          };
      }
  
  
      /* Object Ordering by Field
  ----------------------------------------------------------------------------------------------------------------------*/
  
      FC.parseFieldSpecs = parseFieldSpecs;
      FC.compareByFieldSpecs = compareByFieldSpecs;
      FC.compareByFieldSpec = compareByFieldSpec;
      FC.flexibleCompare = flexibleCompare;
  
  
      function parseFieldSpecs(input) {
          var specs = [];
          var tokens = [];
          var i, token;
  
          if (typeof input === 'string') {
              tokens = input.split(/\s*,\s*/);
          }
          else if (typeof input === 'function') {
              tokens = [input];
          }
          else if ($.isArray(input)) {
              tokens = input;
          }
  
          for (i = 0; i < tokens.length; i++) {
              token = tokens[i];
  
              if (typeof token === 'string') {
                  specs.push(
                      token.charAt(0) == '-' ?
                          {field: token.substring(1), order: -1} :
                          {field: token, order: 1}
                  );
              }
              else if (typeof token === 'function') {
                  specs.push({func: token});
              }
          }
  
          return specs;
      }
  
  
      function compareByFieldSpecs(obj1, obj2, fieldSpecs) {
          var i;
          var cmp;
  
          for (i = 0; i < fieldSpecs.length; i++) {
              cmp = compareByFieldSpec(obj1, obj2, fieldSpecs[i]);
              if (cmp) {
                  return cmp;
              }
          }
  
          return 0;
      }
  
  
      function compareByFieldSpec(obj1, obj2, fieldSpec) {
          if (fieldSpec.func) {
              return fieldSpec.func(obj1, obj2);
          }
          return flexibleCompare(obj1[fieldSpec.field], obj2[fieldSpec.field]) *
              (fieldSpec.order || 1);
      }
  
  
      function flexibleCompare(a, b) {
          if (!a && !b) {
              return 0;
          }
          if (b == null) {
              return -1;
          }
          if (a == null) {
              return 1;
          }
          if ($.type(a) === 'string' || $.type(b) === 'string') {
              return String(a).localeCompare(String(b));
          }
          return a - b;
      }
  
  
      /* FullCalendar-specific Misc Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
  
  // Computes the intersection of the two ranges. Will return fresh date clones in a range.
  // Returns undefined if no intersection.
  // Expects all dates to be normalized to the same timezone beforehand.
  // TODO: move to date section?
      function intersectRanges(subjectRange, constraintRange) {
          var subjectStart = subjectRange.start;
          var subjectEnd = subjectRange.end;
          var constraintStart = constraintRange.start;
          var constraintEnd = constraintRange.end;
          var segStart, segEnd;
          var isStart, isEnd;
  
          if (subjectEnd > constraintStart && subjectStart < constraintEnd) { // in bounds at all?
  
              if (subjectStart >= constraintStart) {
                  segStart = subjectStart.clone();
                  isStart = true;
              }
              else {
                  segStart = constraintStart.clone();
                  isStart = false;
              }
  
              if (subjectEnd <= constraintEnd) {
                  segEnd = subjectEnd.clone();
                  isEnd = true;
              }
              else {
                  segEnd = constraintEnd.clone();
                  isEnd = false;
              }
  
              return {
                  start: segStart,
                  end: segEnd,
                  isStart: isStart,
                  isEnd: isEnd
              };
          }
      }
  
  
      /* Date Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
      FC.computeIntervalUnit = computeIntervalUnit;
      FC.divideRangeByDuration = divideRangeByDuration;
      FC.divideDurationByDuration = divideDurationByDuration;
      FC.multiplyDuration = multiplyDuration;
      FC.durationHasTime = durationHasTime;
  
      var dayIDs = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'];
      var intervalUnits = ['year', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond'];
  
  
  // Diffs the two moments into a Duration where full-days are recorded first, then the remaining time.
  // Moments will have their timezones normalized.
      function diffDayTime(a, b) {
          return moment.duration({
              days: a.clone().stripTime().diff(b.clone().stripTime(), 'days'),
              ms: a.time() - b.time() // time-of-day from day start. disregards timezone
          });
      }
  
  
  // Diffs the two moments via their start-of-day (regardless of timezone). Produces whole-day durations.
      function diffDay(a, b) {
          return moment.duration({
              days: a.clone().stripTime().diff(b.clone().stripTime(), 'days')
          });
      }
  
  
  // Diffs two moments, producing a duration, made of a whole-unit-increment of the given unit. Uses rounding.
      function diffByUnit(a, b, unit) {
          return moment.duration(
              Math.round(a.diff(b, unit, true)), // returnFloat=true
              unit
          );
      }
  
  
  // Computes the unit name of the largest whole-unit period of time.
  // For example, 48 hours will be "days" whereas 49 hours will be "hours".
  // Accepts start/end, a range object, or an original duration object.
      function computeIntervalUnit(start, end) {
          var i, unit;
          var val;
  
          for (i = 0; i < intervalUnits.length; i++) {
              unit = intervalUnits[i];
              val = computeRangeAs(unit, start, end);
  
              if (val >= 1 && isInt(val)) {
                  break;
              }
          }
  
          return unit; // will be "milliseconds" if nothing else matches
      }
  
  
  // Computes the number of units (like "hours") in the given range.
  // Range can be a {start,end} object, separate start/end args, or a Duration.
  // Results are based on Moment's .as() and .diff() methods, so results can depend on internal handling
  // of month-diffing logic (which tends to vary from version to version).
      function computeRangeAs(unit, start, end) {
  
          if (end != null) { // given start, end
              return end.diff(start, unit, true);
          }
          else if (moment.isDuration(start)) { // given duration
              return start.as(unit);
          }
          else { // given { start, end } range object
              return start.end.diff(start.start, unit, true);
          }
      }
  
  
  // Intelligently divides a range (specified by a start/end params) by a duration
      function divideRangeByDuration(start, end, dur) {
          var months;
  
          if (durationHasTime(dur)) {
              return (end - start) / dur;
          }
          months = dur.asMonths();
          if (Math.abs(months) >= 1 && isInt(months)) {
              return end.diff(start, 'months', true) / months;
          }
          return end.diff(start, 'days', true) / dur.asDays();
      }
  
  
  // Intelligently divides one duration by another
      function divideDurationByDuration(dur1, dur2) {
          var months1, months2;
  
          if (durationHasTime(dur1) || durationHasTime(dur2)) {
              return dur1 / dur2;
          }
          months1 = dur1.asMonths();
          months2 = dur2.asMonths();
          if (
              Math.abs(months1) >= 1 && isInt(months1) &&
              Math.abs(months2) >= 1 && isInt(months2)
          ) {
              return months1 / months2;
          }
          return dur1.asDays() / dur2.asDays();
      }
  
  
  // Intelligently multiplies a duration by a number
      function multiplyDuration(dur, n) {
          var months;
  
          if (durationHasTime(dur)) {
              return moment.duration(dur * n);
          }
          months = dur.asMonths();
          if (Math.abs(months) >= 1 && isInt(months)) {
              return moment.duration({months: months * n});
          }
          return moment.duration({days: dur.asDays() * n});
      }
  
  
  // Returns a boolean about whether the given duration has any time parts (hours/minutes/seconds/ms)
      function durationHasTime(dur) {
          return Boolean(dur.hours() || dur.minutes() || dur.seconds() || dur.milliseconds());
      }
  
  
      function isNativeDate(input) {
          return Object.prototype.toString.call(input) === '[object Date]' || input instanceof Date;
      }
  
  
  // Returns a boolean about whether the given input is a time string, like "06:40:00" or "06:00"
      function isTimeString(str) {
          return /^\d+\:\d+(?:\:\d+\.?(?:\d{3})?)?$/.test(str);
      }
  
  
      /* Logging and Debug
  ----------------------------------------------------------------------------------------------------------------------*/
  
      FC.log = function () {
          var console = window.console;
  
          if (console && console.log) {
              return console.log.apply(console, arguments);
          }
      };
  
      FC.warn = function () {
          var console = window.console;
  
          if (console && console.warn) {
              return console.warn.apply(console, arguments);
          }
          else {
              return FC.log.apply(FC, arguments);
          }
      };
  
  
      /* General Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
      var hasOwnPropMethod = {}.hasOwnProperty;
  
  
  // Merges an array of objects into a single object.
  // The second argument allows for an array of property names who's object values will be merged together.
      function mergeProps(propObjs, complexProps) {
          var dest = {};
          var i, name;
          var complexObjs;
          var j, val;
          var props;
  
          if (complexProps) {
              for (i = 0; i < complexProps.length; i++) {
                  name = complexProps[i];
                  complexObjs = [];
  
                  // collect the trailing object values, stopping when a non-object is discovered
                  for (j = propObjs.length - 1; j >= 0; j--) {
                      val = propObjs[j][name];
  
                      if (typeof val === 'object') {
                          complexObjs.unshift(val);
                      }
                      else if (val !== undefined) {
                          dest[name] = val; // if there were no objects, this value will be used
                          break;
                      }
                  }
  
                  // if the trailing values were objects, use the merged value
                  if (complexObjs.length) {
                      dest[name] = mergeProps(complexObjs);
                  }
              }
          }
  
          // copy values into the destination, going from last to first
          for (i = propObjs.length - 1; i >= 0; i--) {
              props = propObjs[i];
  
              for (name in props) {
                  if (!(name in dest)) { // if already assigned by previous props or complex props, don't reassign
                      dest[name] = props[name];
                  }
              }
          }
  
          return dest;
      }
  
  
  // Create an object that has the given prototype. Just like Object.create
      function createObject(proto) {
          var f = function () {
          };
          f.prototype = proto;
          return new f();
      }
  
      FC.createObject = createObject;
  
  
      function copyOwnProps(src, dest) {
          for (var name in src) {
              if (hasOwnProp(src, name)) {
                  dest[name] = src[name];
              }
          }
      }
  
  
      function hasOwnProp(obj, name) {
          return hasOwnPropMethod.call(obj, name);
      }
  
  
  // Is the given value a non-object non-function value?
      function isAtomic(val) {
          return /undefined|null|boolean|number|string/.test($.type(val));
      }
  
  
      function applyAll(functions, thisObj, args) {
          if ($.isFunction(functions)) {
              functions = [functions];
          }
          if (functions) {
              var i;
              var ret;
              for (i = 0; i < functions.length; i++) {
                  ret = functions[i].apply(thisObj, args) || ret;
              }
              return ret;
          }
      }
  
  
      function firstDefined() {
          for (var i = 0; i < arguments.length; i++) {
              if (arguments[i] !== undefined) {
                  return arguments[i];
              }
          }
      }
  
  
      function htmlEscape(s) {
          return (s + '').replace(/&/g, '&amp;')
              .replace(/</g, '&lt;')
              .replace(/>/g, '&gt;')
              .replace(/'/g, '&#039;')
              .replace(/"/g, '&quot;')
              .replace(/\n/g, '<br />');
      }
  
  
      function stripHtmlEntities(text) {
          return text.replace(/&.*?;/g, '');
      }
  
  
  // Given a hash of CSS properties, returns a string of CSS.
  // Uses property names as-is (no camel-case conversion). Will not make statements for null/undefined values.
      function cssToStr(cssProps) {
          var statements = [];
  
          $.each(cssProps, function (name, val) {
              if (val != null) {
                  statements.push(name + ':' + val);
              }
          });
  
          return statements.join(';');
      }
  
  
  // Given an object hash of HTML attribute names to values,
  // generates a string that can be injected between < > in HTML
      function attrsToStr(attrs) {
          var parts = [];
  
          $.each(attrs, function (name, val) {
              if (val != null) {
                  parts.push(name + '="' + htmlEscape(val) + '"');
              }
          });
  
          return parts.join(' ');
      }
  
  
      function capitaliseFirstLetter(str) {
          return str.charAt(0).toUpperCase() + str.slice(1);
      }
  
  
      function compareNumbers(a, b) { // for .sort()
          return a - b;
      }
  
  
      function isInt(n) {
          return n % 1 === 0;
      }
  
  
  // Returns a method bound to the given object context.
  // Just like one of the jQuery.proxy signatures, but without the undesired behavior of treating the same method with
  // different contexts as identical when binding/unbinding events.
      function proxy(obj, methodName) {
          var method = obj[methodName];
  
          return function () {
              return method.apply(obj, arguments);
          };
      }
  
  
  // Returns a function, that, as long as it continues to be invoked, will not
  // be triggered. The function will be called after it stops being called for
  // N milliseconds. If `immediate` is passed, trigger the function on the
  // leading edge, instead of the trailing.
  // https://github.com/jashkenas/underscore/blob/1.6.0/underscore.js#L714
      function debounce(func, wait, immediate) {
          var timeout, args, context, timestamp, result;
  
          var later = function () {
              var last = +new Date() - timestamp;
              if (last < wait) {
                  timeout = setTimeout(later, wait - last);
              }
              else {
                  timeout = null;
                  if (!immediate) {
                      result = func.apply(context, args);
                      context = args = null;
                  }
              }
          };
  
          return function () {
              context = this;
              args = arguments;
              timestamp = +new Date();
              var callNow = immediate && !timeout;
              if (!timeout) {
                  timeout = setTimeout(later, wait);
              }
              if (callNow) {
                  result = func.apply(context, args);
                  context = args = null;
              }
              return result;
          };
      }
  
      ;
      ;
  
      /*
  GENERAL NOTE on moments throughout the *entire rest* of the codebase:
  All moments are assumed to be ambiguously-zoned unless otherwise noted,
  with the NOTABLE EXCEOPTION of start/end dates that live on *Event Objects*.
  Ambiguously-TIMED moments are assumed to be ambiguously-zoned by nature.
  */
  
      var ambigDateOfMonthRegex = /^\s*\d{4}-\d\d$/;
      var ambigTimeOrZoneRegex =
          /^\s*\d{4}-(?:(\d\d-\d\d)|(W\d\d$)|(W\d\d-\d)|(\d\d\d))((T| )(\d\d(:\d\d(:\d\d(\.\d+)?)?)?)?)?$/;
      var newMomentProto = moment.fn; // where we will attach our new methods
      var oldMomentProto = $.extend({}, newMomentProto); // copy of original moment methods
  
  // tell momentjs to transfer these properties upon clone
      var momentProperties = moment.momentProperties;
      momentProperties.push('_fullCalendar');
      momentProperties.push('_ambigTime');
      momentProperties.push('_ambigZone');
  
  
  // Creating
  // -------------------------------------------------------------------------------------------------
  
  // Creates a new moment, similar to the vanilla moment(...) constructor, but with
  // extra features (ambiguous time, enhanced formatting). When given an existing moment,
  // it will function as a clone (and retain the zone of the moment). Anything else will
  // result in a moment in the local zone.
      FC.moment = function () {
          return makeMoment(arguments);
      };
  
  // Sames as FC.moment, but forces the resulting moment to be in the UTC timezone.
      FC.moment.utc = function () {
          var mom = makeMoment(arguments, true);
  
          // Force it into UTC because makeMoment doesn't guarantee it
          // (if given a pre-existing moment for example)
          if (mom.hasTime()) { // don't give ambiguously-timed moments a UTC zone
              mom.utc();
          }
  
          return mom;
      };
  
  // Same as FC.moment, but when given an ISO8601 string, the timezone offset is preserved.
  // ISO8601 strings with no timezone offset will become ambiguously zoned.
      FC.moment.parseZone = function () {
          return makeMoment(arguments, true, true);
      };
  
  // Builds an enhanced moment from args. When given an existing moment, it clones. When given a
  // native Date, or called with no arguments (the current time), the resulting moment will be local.
  // Anything else needs to be "parsed" (a string or an array), and will be affected by:
  //    parseAsUTC - if there is no zone information, should we parse the input in UTC?
  //    parseZone - if there is zone information, should we force the zone of the moment?
      function makeMoment(args, parseAsUTC, parseZone) {
          var input = args[0];
          var isSingleString = args.length == 1 && typeof input === 'string';
          var isAmbigTime;
          var isAmbigZone;
          var ambigMatch;
          var mom;
  
          if (moment.isMoment(input) || isNativeDate(input) || input === undefined) {
              mom = moment.apply(null, args);
          }
          else { // "parsing" is required
              isAmbigTime = false;
              isAmbigZone = false;
  
              if (isSingleString) {
                  if (ambigDateOfMonthRegex.test(input)) {
                      // accept strings like '2014-05', but convert to the first of the month
                      input += '-01';
                      args = [input]; // for when we pass it on to moment's constructor
                      isAmbigTime = true;
                      isAmbigZone = true;
                  }
                  else if ((ambigMatch = ambigTimeOrZoneRegex.exec(input))) {
                      isAmbigTime = !ambigMatch[5]; // no time part?
                      isAmbigZone = true;
                  }
              }
              else if ($.isArray(input)) {
                  // arrays have no timezone information, so assume ambiguous zone
                  isAmbigZone = true;
              }
              // otherwise, probably a string with a format
  
              if (parseAsUTC || isAmbigTime) {
                  mom = moment.utc.apply(moment, args);
              }
              else {
                  mom = moment.apply(null, args);
              }
  
              if (isAmbigTime) {
                  mom._ambigTime = true;
                  mom._ambigZone = true; // ambiguous time always means ambiguous zone
              }
              else if (parseZone) { // let's record the inputted zone somehow
                  if (isAmbigZone) {
                      mom._ambigZone = true;
                  }
                  else if (isSingleString) {
                      mom.utcOffset(input); // if not a valid zone, will assign UTC
                  }
              }
          }
  
          mom._fullCalendar = true; // flag for extended functionality
  
          return mom;
      }
  
  
  // Week Number
  // -------------------------------------------------------------------------------------------------
  
  
  // Returns the week number, considering the locale's custom week number calcuation
  // `weeks` is an alias for `week`
      newMomentProto.week = newMomentProto.weeks = function (input) {
          var weekCalc = this._locale._fullCalendar_weekCalc;
  
          if (input == null && typeof weekCalc === 'function') { // custom function only works for getter
              return weekCalc(this);
          }
          else if (weekCalc === 'ISO') {
              return oldMomentProto.isoWeek.apply(this, arguments); // ISO getter/setter
          }
  
          return oldMomentProto.week.apply(this, arguments); // local getter/setter
      };
  
  
  // Time-of-day
  // -------------------------------------------------------------------------------------------------
  
  // GETTER
  // Returns a Duration with the hours/minutes/seconds/ms values of the moment.
  // If the moment has an ambiguous time, a duration of 00:00 will be returned.
  //
  // SETTER
  // You can supply a Duration, a Moment, or a Duration-like argument.
  // When setting the time, and the moment has an ambiguous time, it then becomes unambiguous.
      newMomentProto.time = function (time) {
  
          // Fallback to the original method (if there is one) if this moment wasn't created via FullCalendar.
          // `time` is a generic enough method name where this precaution is necessary to avoid collisions w/ other plugins.
          if (!this._fullCalendar) {
              return oldMomentProto.time.apply(this, arguments);
          }
  
          if (time == null) { // getter
              return moment.duration({
                  hours: this.hours(),
                  minutes: this.minutes(),
                  seconds: this.seconds(),
                  milliseconds: this.milliseconds()
              });
          }
          else { // setter
  
              this._ambigTime = false; // mark that the moment now has a time
  
              if (!moment.isDuration(time) && !moment.isMoment(time)) {
                  time = moment.duration(time);
              }
  
              // The day value should cause overflow (so 24 hours becomes 00:00:00 of next day).
              // Only for Duration times, not Moment times.
              var dayHours = 0;
              if (moment.isDuration(time)) {
                  dayHours = Math.floor(time.asDays()) * 24;
              }
  
              // We need to set the individual fields.
              // Can't use startOf('day') then add duration. In case of DST at start of day.
              return this.hours(dayHours + time.hours())
                  .minutes(time.minutes())
                  .seconds(time.seconds())
                  .milliseconds(time.milliseconds());
          }
      };
  
  // Converts the moment to UTC, stripping out its time-of-day and timezone offset,
  // but preserving its YMD. A moment with a stripped time will display no time
  // nor timezone offset when .format() is called.
      newMomentProto.stripTime = function () {
  
          if (!this._ambigTime) {
  
              this.utc(true); // keepLocalTime=true (for keeping *date* value)
  
              // set time to zero
              this.set({
                  hours: 0,
                  minutes: 0,
                  seconds: 0,
                  ms: 0
              });
  
              // Mark the time as ambiguous. This needs to happen after the .utc() call, which might call .utcOffset(),
              // which clears all ambig flags.
              this._ambigTime = true;
              this._ambigZone = true; // if ambiguous time, also ambiguous timezone offset
          }
  
          return this; // for chaining
      };
  
  // Returns if the moment has a non-ambiguous time (boolean)
      newMomentProto.hasTime = function () {
          return !this._ambigTime;
      };
  
  
  // Timezone
  // -------------------------------------------------------------------------------------------------
  
  // Converts the moment to UTC, stripping out its timezone offset, but preserving its
  // YMD and time-of-day. A moment with a stripped timezone offset will display no
  // timezone offset when .format() is called.
      newMomentProto.stripZone = function () {
          var wasAmbigTime;
  
          if (!this._ambigZone) {
  
              wasAmbigTime = this._ambigTime;
  
              this.utc(true); // keepLocalTime=true (for keeping date and time values)
  
              // the above call to .utc()/.utcOffset() unfortunately might clear the ambig flags, so restore
              this._ambigTime = wasAmbigTime || false;
  
              // Mark the zone as ambiguous. This needs to happen after the .utc() call, which might call .utcOffset(),
              // which clears the ambig flags.
              this._ambigZone = true;
          }
  
          return this; // for chaining
      };
  
  // Returns of the moment has a non-ambiguous timezone offset (boolean)
      newMomentProto.hasZone = function () {
          return !this._ambigZone;
      };
  
  
  // implicitly marks a zone
      newMomentProto.local = function (keepLocalTime) {
  
          // for when converting from ambiguously-zoned to local,
          // keep the time values when converting from UTC -> local
          oldMomentProto.local.call(this, this._ambigZone || keepLocalTime);
  
          // ensure non-ambiguous
          // this probably already happened via local() -> utcOffset(), but don't rely on Moment's internals
          this._ambigTime = false;
          this._ambigZone = false;
  
          return this; // for chaining
      };
  
  
  // implicitly marks a zone
      newMomentProto.utc = function (keepLocalTime) {
  
          oldMomentProto.utc.call(this, keepLocalTime);
  
          // ensure non-ambiguous
          // this probably already happened via utc() -> utcOffset(), but don't rely on Moment's internals
          this._ambigTime = false;
          this._ambigZone = false;
  
          return this;
      };
  
  
  // implicitly marks a zone (will probably get called upon .utc() and .local())
      newMomentProto.utcOffset = function (tzo) {
  
          if (tzo != null) { // setter
              // these assignments needs to happen before the original zone method is called.
              // I forget why, something to do with a browser crash.
              this._ambigTime = false;
              this._ambigZone = false;
          }
  
          return oldMomentProto.utcOffset.apply(this, arguments);
      };
  
  
  // Formatting
  // -------------------------------------------------------------------------------------------------
  
      newMomentProto.format = function () {
          if (this._fullCalendar && arguments[0]) { // an enhanced moment? and a format string provided?
              return formatDate(this, arguments[0]); // our extended formatting
          }
          if (this._ambigTime) {
              return oldMomentFormat(this, 'YYYY-MM-DD');
          }
          if (this._ambigZone) {
              return oldMomentFormat(this, 'YYYY-MM-DD[T]HH:mm:ss');
          }
          return oldMomentProto.format.apply(this, arguments);
      };
  
      newMomentProto.toISOString = function () {
          if (this._ambigTime) {
              return oldMomentFormat(this, 'YYYY-MM-DD');
          }
          if (this._ambigZone) {
              return oldMomentFormat(this, 'YYYY-MM-DD[T]HH:mm:ss');
          }
          return oldMomentProto.toISOString.apply(this, arguments);
      };
  
      ;
      ;
      (function () {
  
  // exports
          FC.formatDate = formatDate;
          FC.formatRange = formatRange;
          FC.oldMomentFormat = oldMomentFormat;
          FC.queryMostGranularFormatUnit = queryMostGranularFormatUnit;
  
  
  // Config
  // ---------------------------------------------------------------------------------------------------------------------
  
          /*
  Inserted between chunks in the fake ("intermediate") formatting string.
  Important that it passes as whitespace (\s) because moment often identifies non-standalone months
  via a regexp with an \s.
  */
          var PART_SEPARATOR = '\u000b'; // vertical tab
  
          /*
  Inserted as the first character of a literal-text chunk to indicate that the literal text is not actually literal text,
  but rather, a "special" token that has custom rendering (see specialTokens map).
  */
          var SPECIAL_TOKEN_MARKER = '\u001f'; // information separator 1
  
          /*
  Inserted at the beginning and end of a span of text that must have non-zero numeric characters.
  Handling of these markers is done in a post-processing step at the very end of text rendering.
  */
          var MAYBE_MARKER = '\u001e'; // information separator 2
          var MAYBE_REGEXP = new RegExp(MAYBE_MARKER + '([^' + MAYBE_MARKER + ']*)' + MAYBE_MARKER, 'g'); // must be global
  
          /*
  Addition formatting tokens we want recognized
  */
          var specialTokens = {
              t: function (date) { // "a" or "p"
                  return oldMomentFormat(date, 'a').charAt(0);
              },
              T: function (date) { // "A" or "P"
                  return oldMomentFormat(date, 'A').charAt(0);
              }
          };
  
          /*
  The first characters of formatting tokens for units that are 1 day or larger.
  `value` is for ranking relative size (lower means bigger).
  `unit` is a normalized unit, used for comparing moments.
  */
          var largeTokenMap = {
              Y: {value: 1, unit: 'year'},
              M: {value: 2, unit: 'month'},
              W: {value: 3, unit: 'week'}, // ISO week
              w: {value: 3, unit: 'week'}, // local week
              D: {value: 4, unit: 'day'}, // day of month
              d: {value: 4, unit: 'day'} // day of week
          };
  
  
  // Single Date Formatting
  // ---------------------------------------------------------------------------------------------------------------------
  
          /*
  Formats `date` with a Moment formatting string, but allow our non-zero areas and special token
  */
          function formatDate(date, formatStr) {
              return renderFakeFormatString(
                  getParsedFormatString(formatStr).fakeFormatString,
                  date
              );
          }
  
          /*
  Call this if you want Moment's original format method to be used
  */
          function oldMomentFormat(mom, formatStr) {
              return oldMomentProto.format.call(mom, formatStr); // oldMomentProto defined in moment-ext.js
          }
  
  
  // Date Range Formatting
  // -------------------------------------------------------------------------------------------------
  // TODO: make it work with timezone offset
  
          /*
  Using a formatting string meant for a single date, generate a range string, like
  "Sep 2 - 9 2013", that intelligently inserts a separator where the dates differ.
  If the dates are the same as far as the format string is concerned, just return a single
  rendering of one date, without any separator.
  */
          function formatRange(date1, date2, formatStr, separator, isRTL) {
              var localeData;
  
              date1 = FC.moment.parseZone(date1);
              date2 = FC.moment.parseZone(date2);
  
              localeData = date1.localeData();
  
              // Expand localized format strings, like "LL" -> "MMMM D YYYY".
              // BTW, this is not important for `formatDate` because it is impossible to put custom tokens
              // or non-zero areas in Moment's localized format strings.
              formatStr = localeData.longDateFormat(formatStr) || formatStr;
  
              return renderParsedFormat(
                  getParsedFormatString(formatStr),
                  date1,
                  date2,
                  separator || ' - ',
                  isRTL
              );
          }
  
          /*
  Renders a range with an already-parsed format string.
  */
          function renderParsedFormat(parsedFormat, date1, date2, separator, isRTL) {
              var sameUnits = parsedFormat.sameUnits;
              var unzonedDate1 = date1.clone().stripZone(); // for same-unit comparisons
              var unzonedDate2 = date2.clone().stripZone(); // "
  
              var renderedParts1 = renderFakeFormatStringParts(parsedFormat.fakeFormatString, date1);
              var renderedParts2 = renderFakeFormatStringParts(parsedFormat.fakeFormatString, date2);
  
              var leftI;
              var leftStr = '';
              var rightI;
              var rightStr = '';
              var middleI;
              var middleStr1 = '';
              var middleStr2 = '';
              var middleStr = '';
  
              // Start at the leftmost side of the formatting string and continue until you hit a token
              // that is not the same between dates.
              for (
                  leftI = 0;
                  leftI < sameUnits.length && (!sameUnits[leftI] || unzonedDate1.isSame(unzonedDate2, sameUnits[leftI]));
                  leftI++
              ) {
                  leftStr += renderedParts1[leftI];
              }
  
              // Similarly, start at the rightmost side of the formatting string and move left
              for (
                  rightI = sameUnits.length - 1;
                  rightI > leftI && (!sameUnits[rightI] || unzonedDate1.isSame(unzonedDate2, sameUnits[rightI]));
                  rightI--
              ) {
                  // If current chunk is on the boundary of unique date-content, and is a special-case
                  // date-formatting postfix character, then don't consume it. Consider it unique date-content.
                  // TODO: make configurable
                  if (rightI - 1 === leftI && renderedParts1[rightI] === '.') {
                      break;
                  }
  
                  rightStr = renderedParts1[rightI] + rightStr;
              }
  
              // The area in the middle is different for both of the dates.
              // Collect them distinctly so we can jam them together later.
              for (middleI = leftI; middleI <= rightI; middleI++) {
                  middleStr1 += renderedParts1[middleI];
                  middleStr2 += renderedParts2[middleI];
              }
  
              if (middleStr1 || middleStr2) {
                  if (isRTL) {
                      middleStr = middleStr2 + separator + middleStr1;
                  }
                  else {
                      middleStr = middleStr1 + separator + middleStr2;
                  }
              }
  
              return processMaybeMarkers(
                  leftStr + middleStr + rightStr
              );
          }
  
  
  // Format String Parsing
  // ---------------------------------------------------------------------------------------------------------------------
  
          var parsedFormatStrCache = {};
  
          /*
  Returns a parsed format string, leveraging a cache.
  */
          function getParsedFormatString(formatStr) {
              return parsedFormatStrCache[formatStr] ||
                  (parsedFormatStrCache[formatStr] = parseFormatString(formatStr));
          }
  
          /*
  Parses a format string into the following:
  - fakeFormatString: a momentJS formatting string, littered with special control characters that get post-processed.
  - sameUnits: for every part in fakeFormatString, if the part is a token, the value will be a unit string (like "day"),
    that indicates how similar a range's start & end must be in order to share the same formatted text.
    If not a token, then the value is null.
    Always a flat array (not nested liked "chunks").
  */
          function parseFormatString(formatStr) {
              var chunks = chunkFormatString(formatStr);
  
              return {
                  fakeFormatString: buildFakeFormatString(chunks),
                  sameUnits: buildSameUnits(chunks)
              };
          }
  
          /*
  Break the formatting string into an array of chunks.
  A 'maybe' chunk will have nested chunks.
  */
          function chunkFormatString(formatStr) {
              var chunks = [];
              var match;
  
              // TODO: more descrimination
              // \4 is a backreference to the first character of a multi-character set.
              var chunker = /\[([^\]]*)\]|\(([^\)]*)\)|(LTS|LT|(\w)\4*o?)|([^\w\[\(]+)/g;
  
              while ((match = chunker.exec(formatStr))) {
                  if (match[1]) { // a literal string inside [ ... ]
                      chunks.push.apply(chunks, // append
                          splitStringLiteral(match[1])
                      );
                  }
                  else if (match[2]) { // non-zero formatting inside ( ... )
                      chunks.push({maybe: chunkFormatString(match[2])});
                  }
                  else if (match[3]) { // a formatting token
                      chunks.push({token: match[3]});
                  }
                  else if (match[5]) { // an unenclosed literal string
                      chunks.push.apply(chunks, // append
                          splitStringLiteral(match[5])
                      );
                  }
              }
  
              return chunks;
          }
  
          /*
  Potentially splits a literal-text string into multiple parts. For special cases.
  */
          function splitStringLiteral(s) {
              if (s === '. ') {
                  return ['.', ' ']; // for locales with periods bound to the end of each year/month/date
              }
              else {
                  return [s];
              }
          }
  
          /*
  Given chunks parsed from a real format string, generate a fake (aka "intermediate") format string with special control
  characters that will eventually be given to moment for formatting, and then post-processed.
  */
          function buildFakeFormatString(chunks) {
              var parts = [];
              var i, chunk;
  
              for (i = 0; i < chunks.length; i++) {
                  chunk = chunks[i];
  
                  if (typeof chunk === 'string') {
                      parts.push('[' + chunk + ']');
                  }
                  else if (chunk.token) {
                      if (chunk.token in specialTokens) {
                          parts.push(
                              SPECIAL_TOKEN_MARKER + // useful during post-processing
                              '[' + chunk.token + ']' // preserve as literal text
                          );
                      }
                      else {
                          parts.push(chunk.token); // unprotected text implies a format string
                      }
                  }
                  else if (chunk.maybe) {
                      parts.push(
                          MAYBE_MARKER + // useful during post-processing
                          buildFakeFormatString(chunk.maybe) +
                          MAYBE_MARKER
                      );
                  }
              }
  
              return parts.join(PART_SEPARATOR);
          }
  
          /*
  Given parsed chunks from a real formatting string, generates an array of unit strings (like "day") that indicate
  in which regard two dates must be similar in order to share range formatting text.
  The `chunks` can be nested (because of "maybe" chunks), however, the returned array will be flat.
  */
          function buildSameUnits(chunks) {
              var units = [];
              var i, chunk;
              var tokenInfo;
  
              for (i = 0; i < chunks.length; i++) {
                  chunk = chunks[i];
  
                  if (chunk.token) {
                      tokenInfo = largeTokenMap[chunk.token.charAt(0)];
                      units.push(tokenInfo ? tokenInfo.unit : 'second'); // default to a very strict same-second
                  }
                  else if (chunk.maybe) {
                      units.push.apply(units, // append
                          buildSameUnits(chunk.maybe)
                      );
                  }
                  else {
                      units.push(null);
                  }
              }
  
              return units;
          }
  
  
  // Rendering to text
  // ---------------------------------------------------------------------------------------------------------------------
  
          /*
  Formats a date with a fake format string, post-processes the control characters, then returns.
  */
          function renderFakeFormatString(fakeFormatString, date) {
              return processMaybeMarkers(
                  renderFakeFormatStringParts(fakeFormatString, date).join('')
              );
          }
  
          /*
  Formats a date into parts that will have been post-processed, EXCEPT for the "maybe" markers.
  */
          function renderFakeFormatStringParts(fakeFormatString, date) {
              var parts = [];
              var fakeRender = oldMomentFormat(date, fakeFormatString);
              var fakeParts = fakeRender.split(PART_SEPARATOR);
              var i, fakePart;
  
              for (i = 0; i < fakeParts.length; i++) {
                  fakePart = fakeParts[i];
  
                  if (fakePart.charAt(0) === SPECIAL_TOKEN_MARKER) {
                      parts.push(
                          // the literal string IS the token's name.
                          // call special token's registered function.
                          specialTokens[fakePart.substring(1)](date)
                      );
                  }
                  else {
                      parts.push(fakePart);
                  }
              }
  
              return parts;
          }
  
          /*
  Accepts an almost-finally-formatted string and processes the "maybe" control characters, returning a new string.
  */
          function processMaybeMarkers(s) {
              return s.replace(MAYBE_REGEXP, function (m0, m1) { // regex assumed to have 'g' flag
                  if (m1.match(/[1-9]/)) { // any non-zero numeric characters?
                      return m1;
                  }
                  else {
                      return '';
                  }
              });
          }
  
  
  // Misc Utils
  // -------------------------------------------------------------------------------------------------
  
          /*
  Returns a unit string, either 'year', 'month', 'day', or null for the most granular formatting token in the string.
  */
          function queryMostGranularFormatUnit(formatStr) {
              var chunks = chunkFormatString(formatStr);
              var i, chunk;
              var candidate;
              var best;
  
              for (i = 0; i < chunks.length; i++) {
                  chunk = chunks[i];
  
                  if (chunk.token) {
                      candidate = largeTokenMap[chunk.token.charAt(0)];
                      if (candidate) {
                          if (!best || candidate.value > best.value) {
                              best = candidate;
                          }
                      }
                  }
              }
  
              if (best) {
                  return best.unit;
              }
  
              return null;
          };
  
      })();
  
  // quick local references
      var formatDate = FC.formatDate;
      var formatRange = FC.formatRange;
      var oldMomentFormat = FC.oldMomentFormat;
  
      ;
      ;
  
      FC.Class = Class; // export
  
  // Class that all other classes will inherit from
      function Class() {
      }
  
  
  // Called on a class to create a subclass.
  // Last argument contains instance methods. Any argument before the last are considered mixins.
      Class.extend = function () {
          var len = arguments.length;
          var i;
          var members;
  
          for (i = 0; i < len; i++) {
              members = arguments[i];
              if (i < len - 1) { // not the last argument?
                  mixIntoClass(this, members);
              }
          }
  
          return extendClass(this, members || {}); // members will be undefined if no arguments
      };
  
  
  // Adds new member variables/methods to the class's prototype.
  // Can be called with another class, or a plain object hash containing new members.
      Class.mixin = function (members) {
          mixIntoClass(this, members);
      };
  
  
      function extendClass(superClass, members) {
          var subClass;
  
          // ensure a constructor for the subclass, forwarding all arguments to the super-constructor if it doesn't exist
          if (hasOwnProp(members, 'constructor')) {
              subClass = members.constructor;
          }
          if (typeof subClass !== 'function') {
              subClass = members.constructor = function () {
                  superClass.apply(this, arguments);
              };
          }
  
          // build the base prototype for the subclass, which is an new object chained to the superclass's prototype
          subClass.prototype = createObject(superClass.prototype);
  
          // copy each member variable/method onto the the subclass's prototype
          copyOwnProps(members, subClass.prototype);
  
          // copy over all class variables/methods to the subclass, such as `extend` and `mixin`
          copyOwnProps(superClass, subClass);
  
          return subClass;
      }
  
  
      function mixIntoClass(theClass, members) {
          copyOwnProps(members, theClass.prototype);
      }
      ;
      ;
  
      /*
  Wrap jQuery's Deferred Promise object to be slightly more Promise/A+ compliant.
  With the added non-standard feature of synchronously executing handlers on resolved promises,
  which doesn't always happen otherwise (esp with nested .then handlers!?),
  so, this makes things a lot easier, esp because jQuery 3 changed the synchronicity for Deferred objects.
  
  TODO: write tests and more comments
  */
  
      function Promise(executor) {
          var deferred = $.Deferred();
          var promise = deferred.promise();
  
          if (typeof executor === 'function') {
              executor(
                  function (value) { // resolve
                      if (Promise.immediate) {
                          promise._value = value;
                      }
                      deferred.resolve(value);
                  },
                  function () { // reject
                      deferred.reject();
                  }
              );
          }
  
          if (Promise.immediate) {
              var origThen = promise.then;
  
              promise.then = function (onFulfilled, onRejected) {
                  var state = promise.state();
  
                  if (state === 'resolved') {
                      if (typeof onFulfilled === 'function') {
                          return Promise.resolve(onFulfilled(promise._value));
                      }
                  }
                  else if (state === 'rejected') {
                      if (typeof onRejected === 'function') {
                          onRejected();
                          return promise; // already rejected
                      }
                  }
  
                  return origThen.call(promise, onFulfilled, onRejected);
              };
          }
  
          return promise; // instanceof Promise will break :( TODO: make Promise a real class
      }
  
      FC.Promise = Promise;
  
      Promise.immediate = true;
  
  
      Promise.resolve = function (value) {
          if (value && typeof value.resolve === 'function') {
              return value.promise();
          }
          if (value && typeof value.then === 'function') {
              return value;
          }
          else {
              var deferred = $.Deferred().resolve(value);
              var promise = deferred.promise();
  
              if (Promise.immediate) {
                  var origThen = promise.then;
  
                  promise._value = value;
  
                  promise.then = function (onFulfilled, onRejected) {
                      if (typeof onFulfilled === 'function') {
                          return Promise.resolve(onFulfilled(value));
                      }
                      return origThen.call(promise, onFulfilled, onRejected);
                  };
              }
  
              return promise;
          }
      };
  
  
      Promise.reject = function () {
          return $.Deferred().reject().promise();
      };
  
  
      Promise.all = function (inputs) {
          var hasAllValues = false;
          var values;
          var i, input;
  
          if (Promise.immediate) {
              hasAllValues = true;
              values = [];
  
              for (i = 0; i < inputs.length; i++) {
                  input = inputs[i];
  
                  if (input && typeof input.state === 'function' && input.state() === 'resolved' && ('_value' in input)) {
                      values.push(input._value);
                  }
                  else if (input && typeof input.then === 'function') {
                      hasAllValues = false;
                      break;
                  }
                  else {
                      values.push(input);
                  }
              }
          }
  
          if (hasAllValues) {
              return Promise.resolve(values);
          }
          else {
              return $.when.apply($.when, inputs).then(function () {
                  return $.when($.makeArray(arguments));
              });
          }
      };
  
      ;
      ;
  
  // TODO: write tests and clean up code
  
      function TaskQueue(debounceWait) {
          var q = []; // array of runFuncs
  
          function addTask(taskFunc) {
              return new Promise(function (resolve) {
  
                  // should run this function when it's taskFunc's turn to run.
                  // responsible for popping itself off the queue.
                  var runFunc = function () {
                      Promise.resolve(taskFunc()) // result might be async, coerce to promise
                          .then(resolve) // resolve TaskQueue::push's promise, for the caller. will receive result of taskFunc.
                          .then(function () {
                              q.shift(); // pop itself off
  
                              // run the next task, if any
                              if (q.length) {
                                  q[0]();
                              }
                          });
                  };
  
                  // always put the task at the end of the queue, BEFORE running the task
                  q.push(runFunc);
  
                  // if it's the only task in the queue, run immediately
                  if (q.length === 1) {
                      runFunc();
                  }
              });
          }
  
          this.add = // potentially debounce, for the public method
              typeof debounceWait === 'number' ?
                  debounce(addTask, debounceWait) :
                  addTask; // if not a number (null/undefined/false), no debounce at all
  
          this.addQuickly = addTask; // guaranteed no debounce
      }
  
      FC.TaskQueue = TaskQueue;
  
      /*
  q = new TaskQueue();
  
  function work(i) {
  	return q.push(function() {
  		trigger();
  		console.log('work' + i);
  	});
  }
  
  var cnt = 0;
  
  function trigger() {
  	if (cnt < 5) {
  		cnt++;
  		work(cnt);
  	}
  }
  
  work(9);
  */
  
      ;
      ;
  
      var EmitterMixin = FC.EmitterMixin = {
  
          // jQuery-ification via $(this) allows a non-DOM object to have
          // the same event handling capabilities (including namespaces).
  
  
          on: function (types, handler) {
              $(this).on(types, this._prepareIntercept(handler));
              return this; // for chaining
          },
  
  
          one: function (types, handler) {
              $(this).one(types, this._prepareIntercept(handler));
              return this; // for chaining
          },
  
  
          _prepareIntercept: function (handler) {
              // handlers are always called with an "event" object as their first param.
              // sneak the `this` context and arguments into the extra parameter object
              // and forward them on to the original handler.
              var intercept = function (ev, extra) {
                  return handler.apply(
                      extra.context || this,
                      extra.args || []
                  );
              };
  
              // mimick jQuery's internal "proxy" system (risky, I know)
              // causing all functions with the same .guid to appear to be the same.
              // https://github.com/jquery/jquery/blob/2.2.4/src/core.js#L448
              // this is needed for calling .off with the original non-intercept handler.
              if (!handler.guid) {
                  handler.guid = $.guid++;
              }
              intercept.guid = handler.guid;
  
              return intercept;
          },
  
  
          off: function (types, handler) {
              $(this).off(types, handler);
  
              return this; // for chaining
          },
  
  
          trigger: function (types) {
              var args = Array.prototype.slice.call(arguments, 1); // arguments after the first
  
              // pass in "extra" info to the intercept
              $(this).triggerHandler(types, {args: args});
  
              return this; // for chaining
          },
  
  
          triggerWith: function (types, context, args) {
  
              // `triggerHandler` is less reliant on the DOM compared to `trigger`.
              // pass in "extra" info to the intercept.
              $(this).triggerHandler(types, {context: context, args: args});
  
              return this; // for chaining
          }
  
      };
  
      ;
      ;
  
      /*
  Utility methods for easily listening to events on another object,
  and more importantly, easily unlistening from them.
  */
      var ListenerMixin = FC.ListenerMixin = (function () {
          var guid = 0;
          var ListenerMixin = {
  
              listenerId: null,
  
              /*
  		Given an `other` object that has on/off methods, bind the given `callback` to an event by the given name.
  		The `callback` will be called with the `this` context of the object that .listenTo is being called on.
  		Can be called:
  			.listenTo(other, eventName, callback)
  		OR
  			.listenTo(other, {
  				eventName1: callback1,
  				eventName2: callback2
  			})
  		*/
              listenTo: function (other, arg, callback) {
                  if (typeof arg === 'object') { // given dictionary of callbacks
                      for (var eventName in arg) {
                          if (arg.hasOwnProperty(eventName)) {
                              this.listenTo(other, eventName, arg[eventName]);
                          }
                      }
                  }
                  else if (typeof arg === 'string') {
                      other.on(
                          arg + '.' + this.getListenerNamespace(), // use event namespacing to identify this object
                          $.proxy(callback, this) // always use `this` context
                          // the usually-undesired jQuery guid behavior doesn't matter,
                          // because we always unbind via namespace
                      );
                  }
              },
  
              /*
  		Causes the current object to stop listening to events on the `other` object.
  		`eventName` is optional. If omitted, will stop listening to ALL events on `other`.
  		*/
              stopListeningTo: function (other, eventName) {
                  other.off((eventName || '') + '.' + this.getListenerNamespace());
              },
  
              /*
  		Returns a string, unique to this object, to be used for event namespacing
  		*/
              getListenerNamespace: function () {
                  if (this.listenerId == null) {
                      this.listenerId = guid++;
                  }
                  return '_listener' + this.listenerId;
              }
  
          };
          return ListenerMixin;
      })();
      ;
      ;
  
      /* A rectangular panel that is absolutely positioned over other content
  ------------------------------------------------------------------------------------------------------------------------
  Options:
  	- className (string)
  	- content (HTML string or jQuery element set)
  	- parentEl
  	- top
  	- left
  	- right (the x coord of where the right edge should be. not a "CSS" right)
  	- autoHide (boolean)
  	- show (callback)
  	- hide (callback)
  */
  
      var Popover = Class.extend(ListenerMixin, {
  
          isHidden: true,
          options: null,
          el: null, // the container element for the popover. generated by this object
          margin: 10, // the space required between the popover and the edges of the scroll container
  
  
          constructor: function (options) {
              this.options = options || {};
          },
  
  
          // Shows the popover on the specified position. Renders it if not already
          show: function () {
              if (this.isHidden) {
                  if (!this.el) {
                      this.render();
                  }
                  this.el.show();
                  this.position();
                  this.isHidden = false;
                  this.trigger('show');
              }
          },
  
  
          // Hides the popover, through CSS, but does not remove it from the DOM
          hide: function () {
              if (!this.isHidden) {
                  this.el.hide();
                  this.isHidden = true;
                  this.trigger('hide');
              }
          },
  
  
          // Creates `this.el` and renders content inside of it
          render: function () {
              var _this = this;
              var options = this.options;
  
              this.el = $('<div class="fc-popover"/>')
                  .addClass(options.className || '')
                  .css({
                      // position initially to the top left to avoid creating scrollbars
                      top: 0,
                      left: 0
                  })
                  .append(options.content)
                  .appendTo(options.parentEl);
  
              // when a click happens on anything inside with a 'fc-close' className, hide the popover
              this.el.on('click', '.fc-close', function () {
                  _this.hide();
              });
  
              if (options.autoHide) {
                  this.listenTo($(document), 'mousedown', this.documentMousedown);
              }
          },
  
  
          // Triggered when the user clicks *anywhere* in the document, for the autoHide feature
          documentMousedown: function (ev) {
              // only hide the popover if the click happened outside the popover
              if (this.el && !$(ev.target).closest(this.el).length) {
                  this.hide();
              }
          },
  
  
          // Hides and unregisters any handlers
          removeElement: function () {
              this.hide();
  
              if (this.el) {
                  this.el.remove();
                  this.el = null;
              }
  
              this.stopListeningTo($(document), 'mousedown');
          },
  
  
          // Positions the popover optimally, using the top/left/right options
          position: function () {
              var options = this.options;
              var origin = this.el.offsetParent().offset();
              var width = this.el.outerWidth();
              var height = this.el.outerHeight();
              var windowEl = $(window);
              var viewportEl = getScrollParent(this.el);
              var viewportTop;
              var viewportLeft;
              var viewportOffset;
              var top; // the "position" (not "offset") values for the popover
              var left; //
  
              // compute top and left
              top = options.top || 0;
              if (options.left !== undefined) {
                  left = options.left;
              }
              else if (options.right !== undefined) {
                  left = options.right - width; // derive the left value from the right value
              }
              else {
                  left = 0;
              }
  
              if (viewportEl.is(window) || viewportEl.is(document)) { // normalize getScrollParent's result
                  viewportEl = windowEl;
                  viewportTop = 0; // the window is always at the top left
                  viewportLeft = 0; // (and .offset() won't work if called here)
              }
              else {
                  viewportOffset = viewportEl.offset();
                  viewportTop = viewportOffset.top;
                  viewportLeft = viewportOffset.left;
              }
  
              // if the window is scrolled, it causes the visible area to be further down
              viewportTop += windowEl.scrollTop();
              viewportLeft += windowEl.scrollLeft();
  
              // constrain to the view port. if constrained by two edges, give precedence to top/left
              if (options.viewportConstrain !== false) {
                  top = Math.min(top, viewportTop + viewportEl.outerHeight() - height - this.margin);
                  top = Math.max(top, viewportTop + this.margin);
                  left = Math.min(left, viewportLeft + viewportEl.outerWidth() - width - this.margin);
                  left = Math.max(left, viewportLeft + this.margin);
              }
  
              this.el.css({
                  top: top - origin.top,
                  left: left - origin.left
              });
          },
  
  
          // Triggers a callback. Calls a function in the option hash of the same name.
          // Arguments beyond the first `name` are forwarded on.
          // TODO: better code reuse for this. Repeat code
          trigger: function (name) {
              if (this.options[name]) {
                  this.options[name].apply(this, Array.prototype.slice.call(arguments, 1));
              }
          }
  
      });
  
      ;
      ;
  
      /*
  A cache for the left/right/top/bottom/width/height values for one or more elements.
  Works with both offset (from topleft document) and position (from offsetParent).
  
  options:
  - els
  - isHorizontal
  - isVertical
  */
      var CoordCache = FC.CoordCache = Class.extend({
  
          els: null, // jQuery set (assumed to be siblings)
          forcedOffsetParentEl: null, // options can override the natural offsetParent
          origin: null, // {left,top} position of offsetParent of els
          boundingRect: null, // constrain cordinates to this rectangle. {left,right,top,bottom} or null
          isHorizontal: false, // whether to query for left/right/width
          isVertical: false, // whether to query for top/bottom/height
  
          // arrays of coordinates (offsets from topleft of document)
          lefts: null,
          rights: null,
          tops: null,
          bottoms: null,
  
  
          constructor: function (options) {
              this.els = $(options.els);
              this.isHorizontal = options.isHorizontal;
              this.isVertical = options.isVertical;
              this.forcedOffsetParentEl = options.offsetParent ? $(options.offsetParent) : null;
          },
  
  
          // Queries the els for coordinates and stores them.
          // Call this method before using and of the get* methods below.
          build: function () {
              var offsetParentEl = this.forcedOffsetParentEl;
              if (!offsetParentEl && this.els.length > 0) {
                  offsetParentEl = this.els.eq(0).offsetParent();
              }
  
              this.origin = offsetParentEl ?
                  offsetParentEl.offset() :
                  null;
  
              this.boundingRect = this.queryBoundingRect();
  
              if (this.isHorizontal) {
                  this.buildElHorizontals();
              }
              if (this.isVertical) {
                  this.buildElVerticals();
              }
          },
  
  
          // Destroys all internal data about coordinates, freeing memory
          clear: function () {
              this.origin = null;
              this.boundingRect = null;
              this.lefts = null;
              this.rights = null;
              this.tops = null;
              this.bottoms = null;
          },
  
  
          // When called, if coord caches aren't built, builds them
          ensureBuilt: function () {
              if (!this.origin) {
                  this.build();
              }
          },
  
  
          // Populates the left/right internal coordinate arrays
          buildElHorizontals: function () {
              var lefts = [];
              var rights = [];
  
              this.els.each(function (i, node) {
                  var el = $(node);
                  var left = el.offset().left;
                  var width = el.outerWidth();
  
                  lefts.push(left);
                  rights.push(left + width);
              });
  
              this.lefts = lefts;
              this.rights = rights;
          },
  
  
          // Populates the top/bottom internal coordinate arrays
          buildElVerticals: function () {
              var tops = [];
              var bottoms = [];
  
              this.els.each(function (i, node) {
                  var el = $(node);
                  var top = el.offset().top;
                  var height = el.outerHeight();
  
                  tops.push(top);
                  bottoms.push(top + height);
              });
  
              this.tops = tops;
              this.bottoms = bottoms;
          },
  
  
          // Given a left offset (from document left), returns the index of the el that it horizontally intersects.
          // If no intersection is made, returns undefined.
          getHorizontalIndex: function (leftOffset) {
              this.ensureBuilt();
  
              var lefts = this.lefts;
              var rights = this.rights;
              var len = lefts.length;
              var i;
  
              for (i = 0; i < len; i++) {
                  if (leftOffset >= lefts[i] && leftOffset < rights[i]) {
                      return i;
                  }
              }
          },
  
  
          // Given a top offset (from document top), returns the index of the el that it vertically intersects.
          // If no intersection is made, returns undefined.
          getVerticalIndex: function (topOffset) {
              this.ensureBuilt();
  
              var tops = this.tops;
              var bottoms = this.bottoms;
              var len = tops.length;
              var i;
  
              for (i = 0; i < len; i++) {
                  if (topOffset >= tops[i] && topOffset < bottoms[i]) {
                      return i;
                  }
              }
          },
  
  
          // Gets the left offset (from document left) of the element at the given index
          getLeftOffset: function (leftIndex) {
              this.ensureBuilt();
              return this.lefts[leftIndex];
          },
  
  
          // Gets the left position (from offsetParent left) of the element at the given index
          getLeftPosition: function (leftIndex) {
              this.ensureBuilt();
              return this.lefts[leftIndex] - this.origin.left;
          },
  
  
          // Gets the right offset (from document left) of the element at the given index.
          // This value is NOT relative to the document's right edge, like the CSS concept of "right" would be.
          getRightOffset: function (leftIndex) {
              this.ensureBuilt();
              return this.rights[leftIndex];
          },
  
  
          // Gets the right position (from offsetParent left) of the element at the given index.
          // This value is NOT relative to the offsetParent's right edge, like the CSS concept of "right" would be.
          getRightPosition: function (leftIndex) {
              this.ensureBuilt();
              return this.rights[leftIndex] - this.origin.left;
          },
  
  
          // Gets the width of the element at the given index
          getWidth: function (leftIndex) {
              this.ensureBuilt();
              return this.rights[leftIndex] - this.lefts[leftIndex];
          },
  
  
          // Gets the top offset (from document top) of the element at the given index
          getTopOffset: function (topIndex) {
              this.ensureBuilt();
              return this.tops[topIndex];
          },
  
  
          // Gets the top position (from offsetParent top) of the element at the given position
          getTopPosition: function (topIndex) {
              this.ensureBuilt();
              return this.tops[topIndex] - this.origin.top;
          },
  
          // Gets the bottom offset (from the document top) of the element at the given index.
          // This value is NOT relative to the offsetParent's bottom edge, like the CSS concept of "bottom" would be.
          getBottomOffset: function (topIndex) {
              this.ensureBuilt();
              return this.bottoms[topIndex];
          },
  
  
          // Gets the bottom position (from the offsetParent top) of the element at the given index.
          // This value is NOT relative to the offsetParent's bottom edge, like the CSS concept of "bottom" would be.
          getBottomPosition: function (topIndex) {
              this.ensureBuilt();
              return this.bottoms[topIndex] - this.origin.top;
          },
  
  
          // Gets the height of the element at the given index
          getHeight: function (topIndex) {
              this.ensureBuilt();
              return this.bottoms[topIndex] - this.tops[topIndex];
          },
  
  
          // Bounding Rect
          // TODO: decouple this from CoordCache
  
          // Compute and return what the elements' bounding rectangle is, from the user's perspective.
          // Right now, only returns a rectangle if constrained by an overflow:scroll element.
          // Returns null if there are no elements
          queryBoundingRect: function () {
              var scrollParentEl;
  
              if (this.els.length > 0) {
                  scrollParentEl = getScrollParent(this.els.eq(0));
  
                  if (!scrollParentEl.is(document)) {
                      return getClientRect(scrollParentEl);
                  }
              }
  
              return null;
          },
  
          isPointInBounds: function (leftOffset, topOffset) {
              return this.isLeftInBounds(leftOffset) && this.isTopInBounds(topOffset);
          },
  
          isLeftInBounds: function (leftOffset) {
              return !this.boundingRect || (leftOffset >= this.boundingRect.left && leftOffset < this.boundingRect.right);
          },
  
          isTopInBounds: function (topOffset) {
              return !this.boundingRect || (topOffset >= this.boundingRect.top && topOffset < this.boundingRect.bottom);
          }
  
      });
  
      ;
      ;
  
      /* Tracks a drag's mouse movement, firing various handlers
  ----------------------------------------------------------------------------------------------------------------------*/
  // TODO: use Emitter
  
      var DragListener = FC.DragListener = Class.extend(ListenerMixin, {
  
          options: null,
          subjectEl: null,
  
          // coordinates of the initial mousedown
          originX: null,
          originY: null,
  
          // the wrapping element that scrolls, or MIGHT scroll if there's overflow.
          // TODO: do this for wrappers that have overflow:hidden as well.
          scrollEl: null,
  
          isInteracting: false,
          isDistanceSurpassed: false,
          isDelayEnded: false,
          isDragging: false,
          isTouch: false,
  
          delay: null,
          delayTimeoutId: null,
          minDistance: null,
  
          shouldCancelTouchScroll: true,
          scrollAlwaysKills: false,
  
  
          constructor: function (options) {
              this.options = options || {};
          },
  
  
          // Interaction (high-level)
          // -----------------------------------------------------------------------------------------------------------------
  
  
          startInteraction: function (ev, extraOptions) {
              var isTouch = getEvIsTouch(ev);
  
              if (ev.type === 'mousedown') {
                  if (GlobalEmitter.get().shouldIgnoreMouse()) {
                      return;
                  }
                  else if (!isPrimaryMouseButton(ev)) {
                      return;
                  }
                  else {
                      ev.preventDefault(); // prevents native selection in most browsers
                  }
              }
  
              if (!this.isInteracting) {
  
                  // process options
                  extraOptions = extraOptions || {};
                  this.delay = firstDefined(extraOptions.delay, this.options.delay, 0);
                  this.minDistance = firstDefined(extraOptions.distance, this.options.distance, 0);
                  this.subjectEl = this.options.subjectEl;
  
                  preventSelection($('body'));
  
                  this.isInteracting = true;
                  this.isTouch = isTouch;
                  this.isDelayEnded = false;
                  this.isDistanceSurpassed = false;
  
                  this.originX = getEvX(ev);
                  this.originY = getEvY(ev);
                  this.scrollEl = getScrollParent($(ev.target));
  
                  this.bindHandlers();
                  this.initAutoScroll();
                  this.handleInteractionStart(ev);
                  this.startDelay(ev);
  
                  if (!this.minDistance) {
                      this.handleDistanceSurpassed(ev);
                  }
              }
          },
  
  
          handleInteractionStart: function (ev) {
              this.trigger('interactionStart', ev);
          },
  
  
          endInteraction: function (ev, isCancelled) {
              if (this.isInteracting) {
                  this.endDrag(ev);
  
                  if (this.delayTimeoutId) {
                      clearTimeout(this.delayTimeoutId);
                      this.delayTimeoutId = null;
                  }
  
                  this.destroyAutoScroll();
                  this.unbindHandlers();
  
                  this.isInteracting = false;
                  this.handleInteractionEnd(ev, isCancelled);
  
                  allowSelection($('body'));
              }
          },
  
  
          handleInteractionEnd: function (ev, isCancelled) {
              this.trigger('interactionEnd', ev, isCancelled || false);
          },
  
  
          // Binding To DOM
          // -----------------------------------------------------------------------------------------------------------------
  
  
          bindHandlers: function () {
              // some browsers (Safari in iOS 10) don't allow preventDefault on touch events that are bound after touchstart,
              // so listen to the GlobalEmitter singleton, which is always bound, instead of the document directly.
              var globalEmitter = GlobalEmitter.get();
  
              if (this.isTouch) {
                  this.listenTo(globalEmitter, {
                      touchmove: this.handleTouchMove,
                      touchend: this.endInteraction,
                      scroll: this.handleTouchScroll
                  });
              }
              else {
                  this.listenTo(globalEmitter, {
                      mousemove: this.handleMouseMove,
                      mouseup: this.endInteraction
                  });
              }
  
              this.listenTo(globalEmitter, {
                  selectstart: preventDefault, // don't allow selection while dragging
                  contextmenu: preventDefault // long taps would open menu on Chrome dev tools
              });
          },
  
  
          unbindHandlers: function () {
              this.stopListeningTo(GlobalEmitter.get());
          },
  
  
          // Drag (high-level)
          // -----------------------------------------------------------------------------------------------------------------
  
  
          // extraOptions ignored if drag already started
          startDrag: function (ev, extraOptions) {
              this.startInteraction(ev, extraOptions); // ensure interaction began
  
              if (!this.isDragging) {
                  this.isDragging = true;
                  this.handleDragStart(ev);
              }
          },
  
  
          handleDragStart: function (ev) {
              this.trigger('dragStart', ev);
          },
  
  
          handleMove: function (ev) {
              var dx = getEvX(ev) - this.originX;
              var dy = getEvY(ev) - this.originY;
              var minDistance = this.minDistance;
              var distanceSq; // current distance from the origin, squared
  
              if (!this.isDistanceSurpassed) {
                  distanceSq = dx * dx + dy * dy;
                  if (distanceSq >= minDistance * minDistance) { // use pythagorean theorem
                      this.handleDistanceSurpassed(ev);
                  }
              }
  
              if (this.isDragging) {
                  this.handleDrag(dx, dy, ev);
              }
          },
  
  
          // Called while the mouse is being moved and when we know a legitimate drag is taking place
          handleDrag: function (dx, dy, ev) {
              this.trigger('drag', dx, dy, ev);
              this.updateAutoScroll(ev); // will possibly cause scrolling
          },
  
  
          endDrag: function (ev) {
              if (this.isDragging) {
                  this.isDragging = false;
                  this.handleDragEnd(ev);
              }
          },
  
  
          handleDragEnd: function (ev) {
              this.trigger('dragEnd', ev);
          },
  
  
          // Delay
          // -----------------------------------------------------------------------------------------------------------------
  
  
          startDelay: function (initialEv) {
              var _this = this;
  
              if (this.delay) {
                  this.delayTimeoutId = setTimeout(function () {
                      _this.handleDelayEnd(initialEv);
                  }, this.delay);
              }
              else {
                  this.handleDelayEnd(initialEv);
              }
          },
  
  
          handleDelayEnd: function (initialEv) {
              this.isDelayEnded = true;
  
              if (this.isDistanceSurpassed) {
                  this.startDrag(initialEv);
              }
          },
  
  
          // Distance
          // -----------------------------------------------------------------------------------------------------------------
  
  
          handleDistanceSurpassed: function (ev) {
              this.isDistanceSurpassed = true;
  
              if (this.isDelayEnded) {
                  this.startDrag(ev);
              }
          },
  
  
          // Mouse / Touch
          // -----------------------------------------------------------------------------------------------------------------
  
  
          handleTouchMove: function (ev) {
  
              // prevent inertia and touchmove-scrolling while dragging
              if (this.isDragging && this.shouldCancelTouchScroll) {
                  ev.preventDefault();
              }
  
              this.handleMove(ev);
          },
  
  
          handleMouseMove: function (ev) {
              this.handleMove(ev);
          },
  
  
          // Scrolling (unrelated to auto-scroll)
          // -----------------------------------------------------------------------------------------------------------------
  
  
          handleTouchScroll: function (ev) {
              // if the drag is being initiated by touch, but a scroll happens before
              // the drag-initiating delay is over, cancel the drag
              if (!this.isDragging || this.scrollAlwaysKills) {
                  this.endInteraction(ev, true); // isCancelled=true
              }
          },
  
  
          // Utils
          // -----------------------------------------------------------------------------------------------------------------
  
  
          // Triggers a callback. Calls a function in the option hash of the same name.
          // Arguments beyond the first `name` are forwarded on.
          trigger: function (name) {
              if (this.options[name]) {
                  this.options[name].apply(this, Array.prototype.slice.call(arguments, 1));
              }
              // makes _methods callable by event name. TODO: kill this
              if (this['_' + name]) {
                  this['_' + name].apply(this, Array.prototype.slice.call(arguments, 1));
              }
          }
  
  
      });
  
      ;
      ;
      /*
  this.scrollEl is set in DragListener
  */
      DragListener.mixin({
  
          isAutoScroll: false,
  
          scrollBounds: null, // { top, bottom, left, right }
          scrollTopVel: null, // pixels per second
          scrollLeftVel: null, // pixels per second
          scrollIntervalId: null, // ID of setTimeout for scrolling animation loop
  
          // defaults
          scrollSensitivity: 30, // pixels from edge for scrolling to start
          scrollSpeed: 200, // pixels per second, at maximum speed
          scrollIntervalMs: 50, // millisecond wait between scroll increment
  
  
          initAutoScroll: function () {
              var scrollEl = this.scrollEl;
  
              this.isAutoScroll =
                  this.options.scroll &&
                  scrollEl &&
                  !scrollEl.is(window) &&
                  !scrollEl.is(document);
  
              if (this.isAutoScroll) {
                  // debounce makes sure rapid calls don't happen
                  this.listenTo(scrollEl, 'scroll', debounce(this.handleDebouncedScroll, 100));
              }
          },
  
  
          destroyAutoScroll: function () {
              this.endAutoScroll(); // kill any animation loop
  
              // remove the scroll handler if there is a scrollEl
              if (this.isAutoScroll) {
                  this.stopListeningTo(this.scrollEl, 'scroll'); // will probably get removed by unbindHandlers too :(
              }
          },
  
  
          // Computes and stores the bounding rectangle of scrollEl
          computeScrollBounds: function () {
              if (this.isAutoScroll) {
                  this.scrollBounds = getOuterRect(this.scrollEl);
                  // TODO: use getClientRect in future. but prevents auto scrolling when on top of scrollbars
              }
          },
  
  
          // Called when the dragging is in progress and scrolling should be updated
          updateAutoScroll: function (ev) {
              var sensitivity = this.scrollSensitivity;
              var bounds = this.scrollBounds;
              var topCloseness, bottomCloseness;
              var leftCloseness, rightCloseness;
              var topVel = 0;
              var leftVel = 0;
  
              if (bounds) { // only scroll if scrollEl exists
  
                  // compute closeness to edges. valid range is from 0.0 - 1.0
                  topCloseness = (sensitivity - (getEvY(ev) - bounds.top)) / sensitivity;
                  bottomCloseness = (sensitivity - (bounds.bottom - getEvY(ev))) / sensitivity;
                  leftCloseness = (sensitivity - (getEvX(ev) - bounds.left)) / sensitivity;
                  rightCloseness = (sensitivity - (bounds.right - getEvX(ev))) / sensitivity;
  
                  // translate vertical closeness into velocity.
                  // mouse must be completely in bounds for velocity to happen.
                  if (topCloseness >= 0 && topCloseness <= 1) {
                      topVel = topCloseness * this.scrollSpeed * -1; // negative. for scrolling up
                  }
                  else if (bottomCloseness >= 0 && bottomCloseness <= 1) {
                      topVel = bottomCloseness * this.scrollSpeed;
                  }
  
                  // translate horizontal closeness into velocity
                  if (leftCloseness >= 0 && leftCloseness <= 1) {
                      leftVel = leftCloseness * this.scrollSpeed * -1; // negative. for scrolling left
                  }
                  else if (rightCloseness >= 0 && rightCloseness <= 1) {
                      leftVel = rightCloseness * this.scrollSpeed;
                  }
              }
  
              this.setScrollVel(topVel, leftVel);
          },
  
  
          // Sets the speed-of-scrolling for the scrollEl
          setScrollVel: function (topVel, leftVel) {
  
              this.scrollTopVel = topVel;
              this.scrollLeftVel = leftVel;
  
              this.constrainScrollVel(); // massages into realistic values
  
              // if there is non-zero velocity, and an animation loop hasn't already started, then START
              if ((this.scrollTopVel || this.scrollLeftVel) && !this.scrollIntervalId) {
                  this.scrollIntervalId = setInterval(
                      proxy(this, 'scrollIntervalFunc'), // scope to `this`
                      this.scrollIntervalMs
                  );
              }
          },
  
  
          // Forces scrollTopVel and scrollLeftVel to be zero if scrolling has already gone all the way
          constrainScrollVel: function () {
              var el = this.scrollEl;
  
              if (this.scrollTopVel < 0) { // scrolling up?
                  if (el.scrollTop() <= 0) { // already scrolled all the way up?
                      this.scrollTopVel = 0;
                  }
              }
              else if (this.scrollTopVel > 0) { // scrolling down?
                  if (el.scrollTop() + el[0].clientHeight >= el[0].scrollHeight) { // already scrolled all the way down?
                      this.scrollTopVel = 0;
                  }
              }
  
              if (this.scrollLeftVel < 0) { // scrolling left?
                  if (el.scrollLeft() <= 0) { // already scrolled all the left?
                      this.scrollLeftVel = 0;
                  }
              }
              else if (this.scrollLeftVel > 0) { // scrolling right?
                  if (el.scrollLeft() + el[0].clientWidth >= el[0].scrollWidth) { // already scrolled all the way right?
                      this.scrollLeftVel = 0;
                  }
              }
          },
  
  
          // This function gets called during every iteration of the scrolling animation loop
          scrollIntervalFunc: function () {
              var el = this.scrollEl;
              var frac = this.scrollIntervalMs / 1000; // considering animation frequency, what the vel should be mult'd by
  
              // change the value of scrollEl's scroll
              if (this.scrollTopVel) {
                  el.scrollTop(el.scrollTop() + this.scrollTopVel * frac);
              }
              if (this.scrollLeftVel) {
                  el.scrollLeft(el.scrollLeft() + this.scrollLeftVel * frac);
              }
  
              this.constrainScrollVel(); // since the scroll values changed, recompute the velocities
  
              // if scrolled all the way, which causes the vels to be zero, stop the animation loop
              if (!this.scrollTopVel && !this.scrollLeftVel) {
                  this.endAutoScroll();
              }
          },
  
  
          // Kills any existing scrolling animation loop
          endAutoScroll: function () {
              if (this.scrollIntervalId) {
                  clearInterval(this.scrollIntervalId);
                  this.scrollIntervalId = null;
  
                  this.handleScrollEnd();
              }
          },
  
  
          // Get called when the scrollEl is scrolled (NOTE: this is delayed via debounce)
          handleDebouncedScroll: function () {
              // recompute all coordinates, but *only* if this is *not* part of our scrolling animation
              if (!this.scrollIntervalId) {
                  this.handleScrollEnd();
              }
          },
  
  
          // Called when scrolling has stopped, whether through auto scroll, or the user scrolling
          handleScrollEnd: function () {
          }
  
      });
      ;
      ;
  
      /* Tracks mouse movements over a component and raises events about which hit the mouse is over.
  ------------------------------------------------------------------------------------------------------------------------
  options:
  - subjectEl
  - subjectCenter
  */
  
      var HitDragListener = DragListener.extend({
  
          component: null, // converts coordinates to hits
          // methods: hitsNeeded, hitsNotNeeded, queryHit
  
          origHit: null, // the hit the mouse was over when listening started
          hit: null, // the hit the mouse is over
          coordAdjust: null, // delta that will be added to the mouse coordinates when computing collisions
  
  
          constructor: function (component, options) {
              DragListener.call(this, options); // call the super-constructor
  
              this.component = component;
          },
  
  
          // Called when drag listening starts (but a real drag has not necessarily began).
          // ev might be undefined if dragging was started manually.
          handleInteractionStart: function (ev) {
              var subjectEl = this.subjectEl;
              var subjectRect;
              var origPoint;
              var point;
  
              this.component.hitsNeeded();
              this.computeScrollBounds(); // for autoscroll
  
              if (ev) {
                  origPoint = {left: getEvX(ev), top: getEvY(ev)};
                  point = origPoint;
  
                  // constrain the point to bounds of the element being dragged
                  if (subjectEl) {
                      subjectRect = getOuterRect(subjectEl); // used for centering as well
                      point = constrainPoint(point, subjectRect);
                  }
  
                  this.origHit = this.queryHit(point.left, point.top);
  
                  // treat the center of the subject as the collision point?
                  if (subjectEl && this.options.subjectCenter) {
  
                      // only consider the area the subject overlaps the hit. best for large subjects.
                      // TODO: skip this if hit didn't supply left/right/top/bottom
                      if (this.origHit) {
                          subjectRect = intersectRects(this.origHit, subjectRect) ||
                              subjectRect; // in case there is no intersection
                      }
  
                      point = getRectCenter(subjectRect);
                  }
  
                  this.coordAdjust = diffPoints(point, origPoint); // point - origPoint
              }
              else {
                  this.origHit = null;
                  this.coordAdjust = null;
              }
  
              // call the super-method. do it after origHit has been computed
              DragListener.prototype.handleInteractionStart.apply(this, arguments);
          },
  
  
          // Called when the actual drag has started
          handleDragStart: function (ev) {
              var hit;
  
              DragListener.prototype.handleDragStart.apply(this, arguments); // call the super-method
  
              // might be different from this.origHit if the min-distance is large
              hit = this.queryHit(getEvX(ev), getEvY(ev));
  
              // report the initial hit the mouse is over
              // especially important if no min-distance and drag starts immediately
              if (hit) {
                  this.handleHitOver(hit);
              }
          },
  
  
          // Called when the drag moves
          handleDrag: function (dx, dy, ev) {
              var hit;
  
              DragListener.prototype.handleDrag.apply(this, arguments); // call the super-method
  
              hit = this.queryHit(getEvX(ev), getEvY(ev));
  
              if (!isHitsEqual(hit, this.hit)) { // a different hit than before?
                  if (this.hit) {
                      this.handleHitOut();
                  }
                  if (hit) {
                      this.handleHitOver(hit);
                  }
              }
          },
  
  
          // Called when dragging has been stopped
          handleDragEnd: function () {
              this.handleHitDone();
              DragListener.prototype.handleDragEnd.apply(this, arguments); // call the super-method
          },
  
  
          // Called when a the mouse has just moved over a new hit
          handleHitOver: function (hit) {
              var isOrig = isHitsEqual(hit, this.origHit);
  
              this.hit = hit;
  
              this.trigger('hitOver', this.hit, isOrig, this.origHit);
          },
  
  
          // Called when the mouse has just moved out of a hit
          handleHitOut: function () {
              if (this.hit) {
                  this.trigger('hitOut', this.hit);
                  this.handleHitDone();
                  this.hit = null;
              }
          },
  
  
          // Called after a hitOut. Also called before a dragStop
          handleHitDone: function () {
              if (this.hit) {
                  this.trigger('hitDone', this.hit);
              }
          },
  
  
          // Called when the interaction ends, whether there was a real drag or not
          handleInteractionEnd: function () {
              DragListener.prototype.handleInteractionEnd.apply(this, arguments); // call the super-method
  
              this.origHit = null;
              this.hit = null;
  
              this.component.hitsNotNeeded();
          },
  
  
          // Called when scrolling has stopped, whether through auto scroll, or the user scrolling
          handleScrollEnd: function () {
              DragListener.prototype.handleScrollEnd.apply(this, arguments); // call the super-method
  
              // hits' absolute positions will be in new places after a user's scroll.
              // HACK for recomputing.
              if (this.isDragging) {
                  this.component.releaseHits();
                  this.component.prepareHits();
              }
          },
  
  
          // Gets the hit underneath the coordinates for the given mouse event
          queryHit: function (left, top) {
  
              if (this.coordAdjust) {
                  left += this.coordAdjust.left;
                  top += this.coordAdjust.top;
              }
  
              return this.component.queryHit(left, top);
          }
  
      });
  
  
  // Returns `true` if the hits are identically equal. `false` otherwise. Must be from the same component.
  // Two null values will be considered equal, as two "out of the component" states are the same.
      function isHitsEqual(hit0, hit1) {
  
          if (!hit0 && !hit1) {
              return true;
          }
  
          if (hit0 && hit1) {
              return hit0.component === hit1.component &&
                  isHitPropsWithin(hit0, hit1) &&
                  isHitPropsWithin(hit1, hit0); // ensures all props are identical
          }
  
          return false;
      }
  
  
  // Returns true if all of subHit's non-standard properties are within superHit
      function isHitPropsWithin(subHit, superHit) {
          for (var propName in subHit) {
              if (!/^(component|left|right|top|bottom)$/.test(propName)) {
                  if (subHit[propName] !== superHit[propName]) {
                      return false;
                  }
              }
          }
          return true;
      }
  
      ;
      ;
  
      /*
  Listens to document and window-level user-interaction events, like touch events and mouse events,
  and fires these events as-is to whoever is observing a GlobalEmitter.
  Best when used as a singleton via GlobalEmitter.get()
  
  Normalizes mouse/touch events. For examples:
  - ignores the the simulated mouse events that happen after a quick tap: mousemove+mousedown+mouseup+click
  - compensates for various buggy scenarios where a touchend does not fire
  */
  
      FC.touchMouseIgnoreWait = 500;
  
      var GlobalEmitter = Class.extend(ListenerMixin, EmitterMixin, {
  
          isTouching: false,
          mouseIgnoreDepth: 0,
          handleScrollProxy: null,
  
  
          bind: function () {
              var _this = this;
  
              this.listenTo($(document), {
                  touchstart: this.handleTouchStart,
                  touchcancel: this.handleTouchCancel,
                  touchend: this.handleTouchEnd,
                  mousedown: this.handleMouseDown,
                  mousemove: this.handleMouseMove,
                  mouseup: this.handleMouseUp,
                  click: this.handleClick,
                  selectstart: this.handleSelectStart,
                  contextmenu: this.handleContextMenu
              });
  
              // because we need to call preventDefault
              // because https://www.chromestatus.com/features/5093566007214080
              // TODO: investigate performance because this is a global handler
              window.addEventListener(
                  'touchmove',
                  this.handleTouchMoveProxy = function (ev) {
                      _this.handleTouchMove($.Event(ev));
                  },
                  {passive: false} // allows preventDefault()
              );
  
              // attach a handler to get called when ANY scroll action happens on the page.
              // this was impossible to do with normal on/off because 'scroll' doesn't bubble.
              // http://stackoverflow.com/a/32954565/96342
              window.addEventListener(
                  'scroll',
                  this.handleScrollProxy = function (ev) {
                      _this.handleScroll($.Event(ev));
                  },
                  true // useCapture
              );
          },
  
          unbind: function () {
              this.stopListeningTo($(document));
  
              window.removeEventListener(
                  'touchmove',
                  this.handleTouchMoveProxy
              );
  
              window.removeEventListener(
                  'scroll',
                  this.handleScrollProxy,
                  true // useCapture
              );
          },
  
  
          // Touch Handlers
          // -----------------------------------------------------------------------------------------------------------------
  
          handleTouchStart: function (ev) {
  
              // if a previous touch interaction never ended with a touchend, then implicitly end it,
              // but since a new touch interaction is about to begin, don't start the mouse ignore period.
              this.stopTouch(ev, true); // skipMouseIgnore=true
  
              this.isTouching = true;
              this.trigger('touchstart', ev);
          },
  
          handleTouchMove: function (ev) {
              if (this.isTouching) {
                  this.trigger('touchmove', ev);
              }
          },
  
          handleTouchCancel: function (ev) {
              if (this.isTouching) {
                  this.trigger('touchcancel', ev);
  
                  // Have touchcancel fire an artificial touchend. That way, handlers won't need to listen to both.
                  // If touchend fires later, it won't have any effect b/c isTouching will be false.
                  this.stopTouch(ev);
              }
          },
  
          handleTouchEnd: function (ev) {
              this.stopTouch(ev);
          },
  
  
          // Mouse Handlers
          // -----------------------------------------------------------------------------------------------------------------
  
          handleMouseDown: function (ev) {
              if (!this.shouldIgnoreMouse()) {
                  this.trigger('mousedown', ev);
              }
          },
  
          handleMouseMove: function (ev) {
              if (!this.shouldIgnoreMouse()) {
                  this.trigger('mousemove', ev);
              }
          },
  
          handleMouseUp: function (ev) {
              if (!this.shouldIgnoreMouse()) {
                  this.trigger('mouseup', ev);
              }
          },
  
          handleClick: function (ev) {
              if (!this.shouldIgnoreMouse()) {
                  this.trigger('click', ev);
              }
          },
  
  
          // Misc Handlers
          // -----------------------------------------------------------------------------------------------------------------
  
          handleSelectStart: function (ev) {
              this.trigger('selectstart', ev);
          },
  
          handleContextMenu: function (ev) {
              this.trigger('contextmenu', ev);
          },
  
          handleScroll: function (ev) {
              this.trigger('scroll', ev);
          },
  
  
          // Utils
          // -----------------------------------------------------------------------------------------------------------------
  
          stopTouch: function (ev, skipMouseIgnore) {
              if (this.isTouching) {
                  this.isTouching = false;
                  this.trigger('touchend', ev);
  
                  if (!skipMouseIgnore) {
                      this.startTouchMouseIgnore();
                  }
              }
          },
  
          startTouchMouseIgnore: function () {
              var _this = this;
              var wait = FC.touchMouseIgnoreWait;
  
              if (wait) {
                  this.mouseIgnoreDepth++;
                  setTimeout(function () {
                      _this.mouseIgnoreDepth--;
                  }, wait);
              }
          },
  
          shouldIgnoreMouse: function () {
              return this.isTouching || Boolean(this.mouseIgnoreDepth);
          }
  
      });
  
  
  // Singleton
  // ---------------------------------------------------------------------------------------------------------------------
  
      (function () {
          var globalEmitter = null;
          var neededCount = 0;
  
  
          // gets the singleton
          GlobalEmitter.get = function () {
  
              if (!globalEmitter) {
                  globalEmitter = new GlobalEmitter();
                  globalEmitter.bind();
              }
  
              return globalEmitter;
          };
  
  
          // called when an object knows it will need a GlobalEmitter in the near future.
          GlobalEmitter.needed = function () {
              GlobalEmitter.get(); // ensures globalEmitter
              neededCount++;
          };
  
  
          // called when the object that originally called needed() doesn't need a GlobalEmitter anymore.
          GlobalEmitter.unneeded = function () {
              neededCount--;
  
              if (!neededCount) { // nobody else needs it
                  globalEmitter.unbind();
                  globalEmitter = null;
              }
          };
  
      })();
  
      ;
      ;
  
      /* Creates a clone of an element and lets it track the mouse as it moves
  ----------------------------------------------------------------------------------------------------------------------*/
  
      var MouseFollower = Class.extend(ListenerMixin, {
  
          options: null,
  
          sourceEl: null, // the element that will be cloned and made to look like it is dragging
          el: null, // the clone of `sourceEl` that will track the mouse
          parentEl: null, // the element that `el` (the clone) will be attached to
  
          // the initial position of el, relative to the offset parent. made to match the initial offset of sourceEl
          top0: null,
          left0: null,
  
          // the absolute coordinates of the initiating touch/mouse action
          y0: null,
          x0: null,
  
          // the number of pixels the mouse has moved from its initial position
          topDelta: null,
          leftDelta: null,
  
          isFollowing: false,
          isHidden: false,
          isAnimating: false, // doing the revert animation?
  
          constructor: function (sourceEl, options) {
              this.options = options = options || {};
              this.sourceEl = sourceEl;
              this.parentEl = options.parentEl ? $(options.parentEl) : sourceEl.parent(); // default to sourceEl's parent
          },
  
  
          // Causes the element to start following the mouse
          start: function (ev) {
              if (!this.isFollowing) {
                  this.isFollowing = true;
  
                  this.y0 = getEvY(ev);
                  this.x0 = getEvX(ev);
                  this.topDelta = 0;
                  this.leftDelta = 0;
  
                  if (!this.isHidden) {
                      this.updatePosition();
                  }
  
                  if (getEvIsTouch(ev)) {
                      this.listenTo($(document), 'touchmove', this.handleMove);
                  }
                  else {
                      this.listenTo($(document), 'mousemove', this.handleMove);
                  }
              }
          },
  
  
          // Causes the element to stop following the mouse. If shouldRevert is true, will animate back to original position.
          // `callback` gets invoked when the animation is complete. If no animation, it is invoked immediately.
          stop: function (shouldRevert, callback) {
              var _this = this;
              var revertDuration = this.options.revertDuration;
  
              function complete() { // might be called by .animate(), which might change `this` context
                  _this.isAnimating = false;
                  _this.removeElement();
  
                  _this.top0 = _this.left0 = null; // reset state for future updatePosition calls
  
                  if (callback) {
                      callback();
                  }
              }
  
              if (this.isFollowing && !this.isAnimating) { // disallow more than one stop animation at a time
                  this.isFollowing = false;
  
                  this.stopListeningTo($(document));
  
                  if (shouldRevert && revertDuration && !this.isHidden) { // do a revert animation?
                      this.isAnimating = true;
                      this.el.animate({
                          top: this.top0,
                          left: this.left0
                      }, {
                          duration: revertDuration,
                          complete: complete
                      });
                  }
                  else {
                      complete();
                  }
              }
          },
  
  
          // Gets the tracking element. Create it if necessary
          getEl: function () {
              var el = this.el;
  
              if (!el) {
                  el = this.el = this.sourceEl.clone()
                      .addClass(this.options.additionalClass || '')
                      .css({
                          position: 'absolute',
                          visibility: '', // in case original element was hidden (commonly through hideEvents())
                          display: this.isHidden ? 'none' : '', // for when initially hidden
                          margin: 0,
                          right: 'auto', // erase and set width instead
                          bottom: 'auto', // erase and set height instead
                          width: this.sourceEl.width(), // explicit height in case there was a 'right' value
                          height: this.sourceEl.height(), // explicit width in case there was a 'bottom' value
                          opacity: this.options.opacity || '',
                          zIndex: this.options.zIndex
                      });
  
                  // we don't want long taps or any mouse interaction causing selection/menus.
                  // would use preventSelection(), but that prevents selectstart, causing problems.
                  el.addClass('fc-unselectable');
  
                  el.appendTo(this.parentEl);
              }
  
              return el;
          },
  
  
          // Removes the tracking element if it has already been created
          removeElement: function () {
              if (this.el) {
                  this.el.remove();
                  this.el = null;
              }
          },
  
  
          // Update the CSS position of the tracking element
          updatePosition: function () {
              var sourceOffset;
              var origin;
  
              this.getEl(); // ensure this.el
  
              // make sure origin info was computed
              if (this.top0 === null) {
                  sourceOffset = this.sourceEl.offset();
                  origin = this.el.offsetParent().offset();
                  this.top0 = sourceOffset.top - origin.top;
                  this.left0 = sourceOffset.left - origin.left;
              }
  
              this.el.css({
                  top: this.top0 + this.topDelta,
                  left: this.left0 + this.leftDelta
              });
          },
  
  
          // Gets called when the user moves the mouse
          handleMove: function (ev) {
              this.topDelta = getEvY(ev) - this.y0;
              this.leftDelta = getEvX(ev) - this.x0;
  
              if (!this.isHidden) {
                  this.updatePosition();
              }
          },
  
  
          // Temporarily makes the tracking element invisible. Can be called before following starts
          hide: function () {
              if (!this.isHidden) {
                  this.isHidden = true;
                  if (this.el) {
                      this.el.hide();
                  }
              }
          },
  
  
          // Show the tracking element after it has been temporarily hidden
          show: function () {
              if (this.isHidden) {
                  this.isHidden = false;
                  this.updatePosition();
                  this.getEl().show();
              }
          }
  
      });
  
      ;
      ;
  
      /* An abstract class comprised of a "grid" of areas that each represent a specific datetime
  ----------------------------------------------------------------------------------------------------------------------*/
  
      var Grid = FC.Grid = Class.extend(ListenerMixin, {
  
          // self-config, overridable by subclasses
          hasDayInteractions: true, // can user click/select ranges of time?
  
          view: null, // a View object
          isRTL: null, // shortcut to the view's isRTL option
  
          start: null,
          end: null,
  
          el: null, // the containing element
          elsByFill: null, // a hash of jQuery element sets used for rendering each fill. Keyed by fill name.
  
          // derived from options
          eventTimeFormat: null,
          displayEventTime: null,
          displayEventEnd: null,
  
          minResizeDuration: null, // TODO: hack. set by subclasses. minumum event resize duration
  
          // if defined, holds the unit identified (ex: "year" or "month") that determines the level of granularity
          // of the date areas. if not defined, assumes to be day and time granularity.
          // TODO: port isTimeScale into same system?
          largeUnit: null,
  
          dayClickListener: null,
          daySelectListener: null,
          segDragListener: null,
          segResizeListener: null,
          externalDragListener: null,
  
  
          constructor: function (view) {
              this.view = view;
              this.isRTL = view.opt('isRTL');
              this.elsByFill = {};
  
              this.dayClickListener = this.buildDayClickListener();
              this.daySelectListener = this.buildDaySelectListener();
          },
  
  
          /* Options
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Generates the format string used for event time text, if not explicitly defined by 'timeFormat'
          computeEventTimeFormat: function () {
              return this.view.opt('smallTimeFormat');
          },
  
  
          // Determines whether events should have their end times displayed, if not explicitly defined by 'displayEventTime'.
          // Only applies to non-all-day events.
          computeDisplayEventTime: function () {
              return true;
          },
  
  
          // Determines whether events should have their end times displayed, if not explicitly defined by 'displayEventEnd'
          computeDisplayEventEnd: function () {
              return true;
          },
  
  
          /* Dates
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Tells the grid about what period of time to display.
          // Any date-related internal data should be generated.
          setRange: function (range) {
              this.start = range.start.clone();
              this.end = range.end.clone();
  
              this.rangeUpdated();
              this.processRangeOptions();
          },
  
  
          // Called when internal variables that rely on the range should be updated
          rangeUpdated: function () {
          },
  
  
          // Updates values that rely on options and also relate to range
          processRangeOptions: function () {
              var view = this.view;
              var displayEventTime;
              var displayEventEnd;
  
              this.eventTimeFormat =
                  view.opt('eventTimeFormat') ||
                  view.opt('timeFormat') || // deprecated
                  this.computeEventTimeFormat();
  
              displayEventTime = view.opt('displayEventTime');
              if (displayEventTime == null) {
                  displayEventTime = this.computeDisplayEventTime(); // might be based off of range
              }
  
              displayEventEnd = view.opt('displayEventEnd');
              if (displayEventEnd == null) {
                  displayEventEnd = this.computeDisplayEventEnd(); // might be based off of range
              }
  
              this.displayEventTime = displayEventTime;
              this.displayEventEnd = displayEventEnd;
          },
  
  
          // Converts a span (has unzoned start/end and any other grid-specific location information)
          // into an array of segments (pieces of events whose format is decided by the grid).
          spanToSegs: function (span) {
              // subclasses must implement
          },
  
  
          // Diffs the two dates, returning a duration, based on granularity of the grid
          // TODO: port isTimeScale into this system?
          diffDates: function (a, b) {
              if (this.largeUnit) {
                  return diffByUnit(a, b, this.largeUnit);
              }
              else {
                  return diffDayTime(a, b);
              }
          },
  
  
          /* Hit Area
  	------------------------------------------------------------------------------------------------------------------*/
  
          hitsNeededDepth: 0, // necessary because multiple callers might need the same hits
  
          hitsNeeded: function () {
              if (!(this.hitsNeededDepth++)) {
                  this.prepareHits();
              }
          },
  
          hitsNotNeeded: function () {
              if (this.hitsNeededDepth && !(--this.hitsNeededDepth)) {
                  this.releaseHits();
              }
          },
  
  
          // Called before one or more queryHit calls might happen. Should prepare any cached coordinates for queryHit
          prepareHits: function () {
          },
  
  
          // Called when queryHit calls have subsided. Good place to clear any coordinate caches.
          releaseHits: function () {
          },
  
  
          // Given coordinates from the topleft of the document, return data about the date-related area underneath.
          // Can return an object with arbitrary properties (although top/right/left/bottom are encouraged).
          // Must have a `grid` property, a reference to this current grid. TODO: avoid this
          // The returned object will be processed by getHitSpan and getHitEl.
          queryHit: function (leftOffset, topOffset) {
          },
  
  
          // Given position-level information about a date-related area within the grid,
          // should return an object with at least a start/end date. Can provide other information as well.
          getHitSpan: function (hit) {
          },
  
  
          // Given position-level information about a date-related area within the grid,
          // should return a jQuery element that best represents it. passed to dayClick callback.
          getHitEl: function (hit) {
          },
  
  
          /* Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Sets the container element that the grid should render inside of.
          // Does other DOM-related initializations.
          setElement: function (el) {
              this.el = el;
  
              if (this.hasDayInteractions) {
                  preventSelection(el);
  
                  this.bindDayHandler('touchstart', this.dayTouchStart);
                  this.bindDayHandler('mousedown', this.dayMousedown);
              }
  
              // attach event-element-related handlers. in Grid.events
              // same garbage collection note as above.
              this.bindSegHandlers();
  
              this.bindGlobalHandlers();
          },
  
  
          bindDayHandler: function (name, handler) {
              var _this = this;
  
              // attach a handler to the grid's root element.
              // jQuery will take care of unregistering them when removeElement gets called.
              this.el.on(name, function (ev) {
                  if (
                      !$(ev.target).is(
                          _this.segSelector + ',' + // directly on an event element
                          _this.segSelector + ' *,' + // within an event element
                          '.fc-more,' + // a "more.." link
                          'a[data-goto]' // a clickable nav link
                      )
                  ) {
                      return handler.call(_this, ev);
                  }
              });
          },
  
  
          // Removes the grid's container element from the DOM. Undoes any other DOM-related attachments.
          // DOES NOT remove any content beforehand (doesn't clear events or call unrenderDates), unlike View
          removeElement: function () {
              this.unbindGlobalHandlers();
              this.clearDragListeners();
  
              this.el.remove();
  
              // NOTE: we don't null-out this.el for the same reasons we don't do it within View::removeElement
          },
  
  
          // Renders the basic structure of grid view before any content is rendered
          renderSkeleton: function () {
              // subclasses should implement
          },
  
  
          // Renders the grid's date-related content (like areas that represent days/times).
          // Assumes setRange has already been called and the skeleton has already been rendered.
          renderDates: function () {
              // subclasses should implement
          },
  
  
          // Unrenders the grid's date-related content
          unrenderDates: function () {
              // subclasses should implement
          },
  
  
          /* Handlers
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Binds DOM handlers to elements that reside outside the grid, such as the document
          bindGlobalHandlers: function () {
              this.listenTo($(document), {
                  dragstart: this.externalDragStart, // jqui
                  sortstart: this.externalDragStart // jqui
              });
          },
  
  
          // Unbinds DOM handlers from elements that reside outside the grid
          unbindGlobalHandlers: function () {
              this.stopListeningTo($(document));
          },
  
  
          // Process a mousedown on an element that represents a day. For day clicking and selecting.
          dayMousedown: function (ev) {
              var view = this.view;
  
              // prevent a user's clickaway for unselecting a range or an event from
              // causing a dayClick or starting an immediate new selection.
              if (view.isSelected || view.selectedEvent) {
                  return;
              }
  
              this.dayClickListener.startInteraction(ev);
  
              if (view.opt('selectable')) {
                  this.daySelectListener.startInteraction(ev, {
                      distance: view.opt('selectMinDistance')
                  });
              }
          },
  
  
          dayTouchStart: function (ev) {
              var view = this.view;
              var selectLongPressDelay;
  
              // prevent a user's clickaway for unselecting a range or an event from
              // causing a dayClick or starting an immediate new selection.
              if (view.isSelected || view.selectedEvent) {
                  return;
              }
  
              selectLongPressDelay = view.opt('selectLongPressDelay');
              if (selectLongPressDelay == null) {
                  selectLongPressDelay = view.opt('longPressDelay'); // fallback
              }
  
              this.dayClickListener.startInteraction(ev);
  
              if (view.opt('selectable')) {
                  this.daySelectListener.startInteraction(ev, {
                      delay: selectLongPressDelay
                  });
              }
          },
  
  
          // Creates a listener that tracks the user's drag across day elements, for day clicking.
          buildDayClickListener: function () {
              var _this = this;
              var view = this.view;
              var dayClickHit; // null if invalid dayClick
  
              var dragListener = new HitDragListener(this, {
                  scroll: view.opt('dragScroll'),
                  interactionStart: function () {
                      dayClickHit = dragListener.origHit;
                  },
                  hitOver: function (hit, isOrig, origHit) {
                      // if user dragged to another cell at any point, it can no longer be a dayClick
                      if (!isOrig) {
                          dayClickHit = null;
                      }
                  },
                  hitOut: function () { // called before mouse moves to a different hit OR moved out of all hits
                      dayClickHit = null;
                  },
                  interactionEnd: function (ev, isCancelled) {
                      if (!isCancelled && dayClickHit) {
                          view.triggerDayClick(
                              _this.getHitSpan(dayClickHit),
                              _this.getHitEl(dayClickHit),
                              ev
                          );
                      }
                  }
              });
  
              // because dayClickListener won't be called with any time delay, "dragging" will begin immediately,
              // which will kill any touchmoving/scrolling. Prevent this.
              dragListener.shouldCancelTouchScroll = false;
  
              dragListener.scrollAlwaysKills = true;
  
              return dragListener;
          },
  
  
          // Creates a listener that tracks the user's drag across day elements, for day selecting.
          buildDaySelectListener: function () {
              var _this = this;
              var view = this.view;
              var selectionSpan; // null if invalid selection
  
              var dragListener = new HitDragListener(this, {
                  scroll: view.opt('dragScroll'),
                  interactionStart: function () {
                      selectionSpan = null;
                  },
                  dragStart: function () {
                      view.unselect(); // since we could be rendering a new selection, we want to clear any old one
                  },
                  hitOver: function (hit, isOrig, origHit) {
                      if (origHit) { // click needs to have started on a hit
  
                          selectionSpan = _this.computeSelection(
                              _this.getHitSpan(origHit),
                              _this.getHitSpan(hit)
                          );
  
                          if (selectionSpan) {
                              _this.renderSelection(selectionSpan);
                          }
                          else if (selectionSpan === false) {
                              disableCursor();
                          }
                      }
                  },
                  hitOut: function () { // called before mouse moves to a different hit OR moved out of all hits
                      selectionSpan = null;
                      _this.unrenderSelection();
                  },
                  hitDone: function () { // called after a hitOut OR before a dragEnd
                      enableCursor();
                  },
                  interactionEnd: function (ev, isCancelled) {
                      if (!isCancelled && selectionSpan) {
                          // the selection will already have been rendered. just report it
                          view.reportSelection(selectionSpan, ev);
                      }
                  }
              });
  
              return dragListener;
          },
  
  
          // Kills all in-progress dragging.
          // Useful for when public API methods that result in re-rendering are invoked during a drag.
          // Also useful for when touch devices misbehave and don't fire their touchend.
          clearDragListeners: function () {
              this.dayClickListener.endInteraction();
              this.daySelectListener.endInteraction();
  
              if (this.segDragListener) {
                  this.segDragListener.endInteraction(); // will clear this.segDragListener
              }
              if (this.segResizeListener) {
                  this.segResizeListener.endInteraction(); // will clear this.segResizeListener
              }
              if (this.externalDragListener) {
                  this.externalDragListener.endInteraction(); // will clear this.externalDragListener
              }
          },
  
  
          /* Event Helper
  	------------------------------------------------------------------------------------------------------------------*/
          // TODO: should probably move this to Grid.events, like we did event dragging / resizing
  
  
          // Renders a mock event at the given event location, which contains zoned start/end properties.
          // Returns all mock event elements.
          renderEventLocationHelper: function (eventLocation, sourceSeg) {
              var fakeEvent = this.fabricateHelperEvent(eventLocation, sourceSeg);
  
              return this.renderHelper(fakeEvent, sourceSeg); // do the actual rendering
          },
  
  
          // Builds a fake event given zoned event date properties and a segment is should be inspired from.
          // The range's end can be null, in which case the mock event that is rendered will have a null end time.
          // `sourceSeg` is the internal segment object involved in the drag. If null, something external is dragging.
          fabricateHelperEvent: function (eventLocation, sourceSeg) {
              var fakeEvent = sourceSeg ? createObject(sourceSeg.event) : {}; // mask the original event object if possible
  
              fakeEvent.start = eventLocation.start.clone();
              fakeEvent.end = eventLocation.end ? eventLocation.end.clone() : null;
              fakeEvent.allDay = null; // force it to be freshly computed by normalizeEventDates
              this.view.calendar.normalizeEventDates(fakeEvent);
  
              // this extra className will be useful for differentiating real events from mock events in CSS
              fakeEvent.className = (fakeEvent.className || []).concat('fc-helper');
  
              // if something external is being dragged in, don't render a resizer
              if (!sourceSeg) {
                  fakeEvent.editable = false;
              }
  
              return fakeEvent;
          },
  
  
          // Renders a mock event. Given zoned event date properties.
          // Must return all mock event elements.
          renderHelper: function (eventLocation, sourceSeg) {
              // subclasses must implement
          },
  
  
          // Unrenders a mock event
          unrenderHelper: function () {
              // subclasses must implement
          },
  
  
          /* Selection
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a visual indication of a selection. Will highlight by default but can be overridden by subclasses.
          // Given a span (unzoned start/end and other misc data)
          renderSelection: function (span) {
              this.renderHighlight(span);
          },
  
  
          // Unrenders any visual indications of a selection. Will unrender a highlight by default.
          unrenderSelection: function () {
              this.unrenderHighlight();
          },
  
  
          // Given the first and last date-spans of a selection, returns another date-span object.
          // Subclasses can override and provide additional data in the span object. Will be passed to renderSelection().
          // Will return false if the selection is invalid and this should be indicated to the user.
          // Will return null/undefined if a selection invalid but no error should be reported.
          computeSelection: function (span0, span1) {
              var span = this.computeSelectionSpan(span0, span1);
  
              if (span && !this.view.calendar.isSelectionSpanAllowed(span)) {
                  return false;
              }
  
              return span;
          },
  
  
          // Given two spans, must return the combination of the two.
          // TODO: do this separation of concerns (combining VS validation) for event dnd/resize too.
          computeSelectionSpan: function (span0, span1) {
              var dates = [span0.start, span0.end, span1.start, span1.end];
  
              dates.sort(compareNumbers); // sorts chronologically. works with Moments
  
              return {start: dates[0].clone(), end: dates[3].clone()};
          },
  
  
          /* Highlight
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders an emphasis on the given date range. Given a span (unzoned start/end and other misc data)
          renderHighlight: function (span) {
              this.renderFill('highlight', this.spanToSegs(span));
          },
  
  
          // Unrenders the emphasis on a date range
          unrenderHighlight: function () {
              this.unrenderFill('highlight');
          },
  
  
          // Generates an array of classNames for rendering the highlight. Used by the fill system.
          highlightSegClasses: function () {
              return ['fc-highlight'];
          },
  
  
          /* Business Hours
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderBusinessHours: function () {
          },
  
  
          unrenderBusinessHours: function () {
          },
  
  
          /* Now Indicator
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          getNowIndicatorUnit: function () {
          },
  
  
          renderNowIndicator: function (date) {
          },
  
  
          unrenderNowIndicator: function () {
          },
  
  
          /* Fill System (highlight, background events, business hours)
  	--------------------------------------------------------------------------------------------------------------------
  	TODO: remove this system. like we did in TimeGrid
  	*/
  
  
          // Renders a set of rectangles over the given segments of time.
          // MUST RETURN a subset of segs, the segs that were actually rendered.
          // Responsible for populating this.elsByFill. TODO: better API for expressing this requirement
          renderFill: function (type, segs) {
              // subclasses must implement
          },
  
  
          // Unrenders a specific type of fill that is currently rendered on the grid
          unrenderFill: function (type) {
              var el = this.elsByFill[type];
  
              if (el) {
                  el.remove();
                  delete this.elsByFill[type];
              }
          },
  
  
          // Renders and assigns an `el` property for each fill segment. Generic enough to work with different types.
          // Only returns segments that successfully rendered.
          // To be harnessed by renderFill (implemented by subclasses).
          // Analagous to renderFgSegEls.
          renderFillSegEls: function (type, segs) {
              var _this = this;
              var segElMethod = this[type + 'SegEl'];
              var html = '';
              var renderedSegs = [];
              var i;
  
              if (segs.length) {
  
                  // build a large concatenation of segment HTML
                  for (i = 0; i < segs.length; i++) {
                      html += this.fillSegHtml(type, segs[i]);
                  }
  
                  // Grab individual elements from the combined HTML string. Use each as the default rendering.
                  // Then, compute the 'el' for each segment.
                  $(html).each(function (i, node) {
                      var seg = segs[i];
                      var el = $(node);
  
                      // allow custom filter methods per-type
                      if (segElMethod) {
                          el = segElMethod.call(_this, seg, el);
                      }
  
                      if (el) { // custom filters did not cancel the render
                          el = $(el); // allow custom filter to return raw DOM node
  
                          // correct element type? (would be bad if a non-TD were inserted into a table for example)
                          if (el.is(_this.fillSegTag)) {
                              seg.el = el;
                              renderedSegs.push(seg);
                          }
                      }
                  });
              }
  
              return renderedSegs;
          },
  
  
          fillSegTag: 'div', // subclasses can override
  
  
          // Builds the HTML needed for one fill segment. Generic enough to work with different types.
          fillSegHtml: function (type, seg) {
  
              // custom hooks per-type
              var classesMethod = this[type + 'SegClasses'];
              var cssMethod = this[type + 'SegCss'];
  
              var classes = classesMethod ? classesMethod.call(this, seg) : [];
              var css = cssToStr(cssMethod ? cssMethod.call(this, seg) : {});
  
              return '<' + this.fillSegTag +
                  (classes.length ? ' class="' + classes.join(' ') + '"' : '') +
                  (css ? ' style="' + css + '"' : '') +
                  ' />';
          },
  
  
          /* Generic rendering utilities for subclasses
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Computes HTML classNames for a single-day element
          getDayClasses: function (date, noThemeHighlight) {
              var view = this.view;
              var today = view.calendar.getNow();
              var classes = ['fc-' + dayIDs[date.day()]];
  
              if (
                  view.intervalDuration.as('months') == 1 &&
                  date.month() != view.intervalStart.month()
              ) {
                  classes.push('fc-other-month');
              }
  
              if (date.isSame(today, 'day')) {
                  classes.push('fc-today');
  
                  if (noThemeHighlight !== true) {
                      classes.push(view.highlightStateClass);
                  }
              }
              else if (date < today) {
                  classes.push('fc-past');
              }
              else {
                  classes.push('fc-future');
              }
  
              return classes;
          }
  
      });
  
      ;
      ;
  
      /* Event-rendering and event-interaction methods for the abstract Grid class
  ----------------------------------------------------------------------------------------------------------------------*/
  
      Grid.mixin({
  
          // self-config, overridable by subclasses
          segSelector: '.fc-event-container > *', // what constitutes an event element?
  
          mousedOverSeg: null, // the segment object the user's mouse is over. null if over nothing
          isDraggingSeg: false, // is a segment being dragged? boolean
          isResizingSeg: false, // is a segment being resized? boolean
          isDraggingExternal: false, // jqui-dragging an external element? boolean
          segs: null, // the *event* segments currently rendered in the grid. TODO: rename to `eventSegs`
  
  
          // Renders the given events onto the grid
          renderEvents: function (events) {
              var bgEvents = [];
              var fgEvents = [];
              var i;
  
              for (i = 0; i < events.length; i++) {
                  (isBgEvent(events[i]) ? bgEvents : fgEvents).push(events[i]);
              }
  
              this.segs = [].concat( // record all segs
                  this.renderBgEvents(bgEvents),
                  this.renderFgEvents(fgEvents)
              );
          },
  
  
          renderBgEvents: function (events) {
              var segs = this.eventsToSegs(events);
  
              // renderBgSegs might return a subset of segs, segs that were actually rendered
              return this.renderBgSegs(segs) || segs;
          },
  
  
          renderFgEvents: function (events) {
              var segs = this.eventsToSegs(events);
  
              // renderFgSegs might return a subset of segs, segs that were actually rendered
              return this.renderFgSegs(segs) || segs;
          },
  
  
          // Unrenders all events currently rendered on the grid
          unrenderEvents: function () {
              this.handleSegMouseout(); // trigger an eventMouseout if user's mouse is over an event
              this.clearDragListeners();
  
              this.unrenderFgSegs();
              this.unrenderBgSegs();
  
              this.segs = null;
          },
  
  
          // Retrieves all rendered segment objects currently rendered on the grid
          getEventSegs: function () {
              return this.segs || [];
          },
  
  
          /* Foreground Segment Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders foreground event segments onto the grid. May return a subset of segs that were rendered.
          renderFgSegs: function (segs) {
              // subclasses must implement
          },
  
  
          // Unrenders all currently rendered foreground segments
          unrenderFgSegs: function () {
              // subclasses must implement
          },
  
  
          // Renders and assigns an `el` property for each foreground event segment.
          // Only returns segments that successfully rendered.
          // A utility that subclasses may use.
          renderFgSegEls: function (segs, disableResizing) {
              var view = this.view;
              var html = '';
              var renderedSegs = [];
              var i;
  
              if (segs.length) { // don't build an empty html string
  
                  // build a large concatenation of event segment HTML
                  for (i = 0; i < segs.length; i++) {
                      html += this.fgSegHtml(segs[i], disableResizing);
                  }
  
                  // Grab individual elements from the combined HTML string. Use each as the default rendering.
                  // Then, compute the 'el' for each segment. An el might be null if the eventRender callback returned false.
                  $(html).each(function (i, node) {
                      var seg = segs[i];
                      var el = view.resolveEventEl(seg.event, $(node));
  
                      if (el) {
                          el.data('fc-seg', seg); // used by handlers
                          seg.el = el;
                          renderedSegs.push(seg);
                      }
                  });
              }
  
              return renderedSegs;
          },
  
  
          // Generates the HTML for the default rendering of a foreground event segment. Used by renderFgSegEls()
          fgSegHtml: function (seg, disableResizing) {
              // subclasses should implement
          },
  
  
          /* Background Segment Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders the given background event segments onto the grid.
          // Returns a subset of the segs that were actually rendered.
          renderBgSegs: function (segs) {
              return this.renderFill('bgEvent', segs);
          },
  
  
          // Unrenders all the currently rendered background event segments
          unrenderBgSegs: function () {
              this.unrenderFill('bgEvent');
          },
  
  
          // Renders a background event element, given the default rendering. Called by the fill system.
          bgEventSegEl: function (seg, el) {
              return this.view.resolveEventEl(seg.event, el); // will filter through eventRender
          },
  
  
          // Generates an array of classNames to be used for the default rendering of a background event.
          // Called by fillSegHtml.
          bgEventSegClasses: function (seg) {
              var event = seg.event;
              var source = event.source || {};
  
              return ['fc-bgevent'].concat(
                  event.className,
                  source.className || []
              );
          },
  
  
          // Generates a semicolon-separated CSS string to be used for the default rendering of a background event.
          // Called by fillSegHtml.
          bgEventSegCss: function (seg) {
              return {
                  'background-color': this.getSegSkinCss(seg)['background-color']
              };
          },
  
  
          // Generates an array of classNames to be used for the rendering business hours overlay. Called by the fill system.
          // Called by fillSegHtml.
          businessHoursSegClasses: function (seg) {
              return ['fc-nonbusiness', 'fc-bgevent'];
          },
  
  
          /* Business Hours
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Compute business hour segs for the grid's current date range.
          // Caller must ask if whole-day business hours are needed.
          // If no `businessHours` configuration value is specified, assumes the calendar default.
          buildBusinessHourSegs: function (wholeDay, businessHours) {
              return this.eventsToSegs(
                  this.buildBusinessHourEvents(wholeDay, businessHours)
              );
          },
  
  
          // Compute business hour *events* for the grid's current date range.
          // Caller must ask if whole-day business hours are needed.
          // If no `businessHours` configuration value is specified, assumes the calendar default.
          buildBusinessHourEvents: function (wholeDay, businessHours) {
              var calendar = this.view.calendar;
              var events;
  
              if (businessHours == null) {
                  // fallback
                  // access from calendawr. don't access from view. doesn't update with dynamic options.
                  businessHours = calendar.options.businessHours;
              }
  
              events = calendar.computeBusinessHourEvents(wholeDay, businessHours);
  
              // HACK. Eventually refactor business hours "events" system.
              // If no events are given, but businessHours is activated, this means the entire visible range should be
              // marked as *not* business-hours, via inverse-background rendering.
              if (!events.length && businessHours) {
                  events = [
                      $.extend({}, BUSINESS_HOUR_EVENT_DEFAULTS, {
                          start: this.view.end, // guaranteed out-of-range
                          end: this.view.end,   // "
                          dow: null
                      })
                  ];
              }
  
              return events;
          },
  
  
          /* Handlers
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Attaches event-element-related handlers for *all* rendered event segments of the view.
          bindSegHandlers: function () {
              this.bindSegHandlersToEl(this.el);
          },
  
  
          // Attaches event-element-related handlers to an arbitrary container element. leverages bubbling.
          bindSegHandlersToEl: function (el) {
              this.bindSegHandlerToEl(el, 'touchstart', this.handleSegTouchStart);
              this.bindSegHandlerToEl(el, 'mouseenter', this.handleSegMouseover);
              this.bindSegHandlerToEl(el, 'mouseleave', this.handleSegMouseout);
              this.bindSegHandlerToEl(el, 'mousedown', this.handleSegMousedown);
              this.bindSegHandlerToEl(el, 'click', this.handleSegClick);
          },
  
  
          // Executes a handler for any a user-interaction on a segment.
          // Handler gets called with (seg, ev), and with the `this` context of the Grid
          bindSegHandlerToEl: function (el, name, handler) {
              var _this = this;
  
              el.on(name, this.segSelector, function (ev) {
                  var seg = $(this).data('fc-seg'); // grab segment data. put there by View::renderEvents
  
                  // only call the handlers if there is not a drag/resize in progress
                  if (seg && !_this.isDraggingSeg && !_this.isResizingSeg) {
                      return handler.call(_this, seg, ev); // context will be the Grid
                  }
              });
          },
  
  
          handleSegClick: function (seg, ev) {
              var res = this.view.publiclyTrigger('eventClick', seg.el[0], seg.event, ev); // can return `false` to cancel
              if (res === false) {
                  ev.preventDefault();
              }
          },
  
  
          // Updates internal state and triggers handlers for when an event element is moused over
          handleSegMouseover: function (seg, ev) {
              if (
                  !GlobalEmitter.get().shouldIgnoreMouse() &&
                  !this.mousedOverSeg
              ) {
                  this.mousedOverSeg = seg;
                  if (this.view.isEventResizable(seg.event)) {
                      seg.el.addClass('fc-allow-mouse-resize');
                  }
                  this.view.publiclyTrigger('eventMouseover', seg.el[0], seg.event, ev);
              }
          },
  
  
          // Updates internal state and triggers handlers for when an event element is moused out.
          // Can be given no arguments, in which case it will mouseout the segment that was previously moused over.
          handleSegMouseout: function (seg, ev) {
              ev = ev || {}; // if given no args, make a mock mouse event
  
              if (this.mousedOverSeg) {
                  seg = seg || this.mousedOverSeg; // if given no args, use the currently moused-over segment
                  this.mousedOverSeg = null;
                  if (this.view.isEventResizable(seg.event)) {
                      seg.el.removeClass('fc-allow-mouse-resize');
                  }
                  this.view.publiclyTrigger('eventMouseout', seg.el[0], seg.event, ev);
              }
          },
  
  
          handleSegMousedown: function (seg, ev) {
              var isResizing = this.startSegResize(seg, ev, {distance: 5});
  
              if (!isResizing && this.view.isEventDraggable(seg.event)) {
                  this.buildSegDragListener(seg)
                      .startInteraction(ev, {
                          distance: 5
                      });
              }
          },
  
  
          handleSegTouchStart: function (seg, ev) {
              var view = this.view;
              var event = seg.event;
              var isSelected = view.isEventSelected(event);
              var isDraggable = view.isEventDraggable(event);
              var isResizable = view.isEventResizable(event);
              var isResizing = false;
              var dragListener;
              var eventLongPressDelay;
  
              if (isSelected && isResizable) {
                  // only allow resizing of the event is selected
                  isResizing = this.startSegResize(seg, ev);
              }
  
              if (!isResizing && (isDraggable || isResizable)) { // allowed to be selected?
  
                  eventLongPressDelay = view.opt('eventLongPressDelay');
                  if (eventLongPressDelay == null) {
                      eventLongPressDelay = view.opt('longPressDelay'); // fallback
                  }
  
                  dragListener = isDraggable ?
                      this.buildSegDragListener(seg) :
                      this.buildSegSelectListener(seg); // seg isn't draggable, but still needs to be selected
  
                  dragListener.startInteraction(ev, { // won't start if already started
                      delay: isSelected ? 0 : eventLongPressDelay // do delay if not already selected
                  });
              }
          },
  
  
          // returns boolean whether resizing actually started or not.
          // assumes the seg allows resizing.
          // `dragOptions` are optional.
          startSegResize: function (seg, ev, dragOptions) {
              if ($(ev.target).is('.fc-resizer')) {
                  this.buildSegResizeListener(seg, $(ev.target).is('.fc-start-resizer'))
                      .startInteraction(ev, dragOptions);
                  return true;
              }
              return false;
          },
  
  
          /* Event Dragging
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Builds a listener that will track user-dragging on an event segment.
          // Generic enough to work with any type of Grid.
          // Has side effect of setting/unsetting `segDragListener`
          buildSegDragListener: function (seg) {
              var _this = this;
              var view = this.view;
              var calendar = view.calendar;
              var el = seg.el;
              var event = seg.event;
              var isDragging;
              var mouseFollower; // A clone of the original element that will move with the mouse
              var dropLocation; // zoned event date properties
  
              if (this.segDragListener) {
                  return this.segDragListener;
              }
  
              // Tracks mouse movement over the *view's* coordinate map. Allows dragging and dropping between subcomponents
              // of the view.
              var dragListener = this.segDragListener = new HitDragListener(view, {
                  scroll: view.opt('dragScroll'),
                  subjectEl: el,
                  subjectCenter: true,
                  interactionStart: function (ev) {
                      seg.component = _this; // for renderDrag
                      isDragging = false;
                      mouseFollower = new MouseFollower(seg.el, {
                          additionalClass: 'fc-dragging',
                          parentEl: view.el,
                          opacity: dragListener.isTouch ? null : view.opt('dragOpacity'),
                          revertDuration: view.opt('dragRevertDuration'),
                          zIndex: 2 // one above the .fc-view
                      });
                      mouseFollower.hide(); // don't show until we know this is a real drag
                      mouseFollower.start(ev);
                  },
                  dragStart: function (ev) {
                      if (dragListener.isTouch && !view.isEventSelected(event)) {
                          // if not previously selected, will fire after a delay. then, select the event
                          view.selectEvent(event);
                      }
                      isDragging = true;
                      _this.handleSegMouseout(seg, ev); // ensure a mouseout on the manipulated event has been reported
                      _this.segDragStart(seg, ev);
                      view.hideEvent(event); // hide all event segments. our mouseFollower will take over
                  },
                  hitOver: function (hit, isOrig, origHit) {
                      var dragHelperEls;
  
                      // starting hit could be forced (DayGrid.limit)
                      if (seg.hit) {
                          origHit = seg.hit;
                      }
  
                      // since we are querying the parent view, might not belong to this grid
                      dropLocation = _this.computeEventDrop(
                          origHit.component.getHitSpan(origHit),
                          hit.component.getHitSpan(hit),
                          event
                      );
  
                      if (dropLocation && !calendar.isEventSpanAllowed(_this.eventToSpan(dropLocation), event)) {
                          disableCursor();
                          dropLocation = null;
                      }
  
                      // if a valid drop location, have the subclass render a visual indication
                      if (dropLocation && (dragHelperEls = view.renderDrag(dropLocation, seg))) {
  
                          dragHelperEls.addClass('fc-dragging');
                          if (!dragListener.isTouch) {
                              _this.applyDragOpacity(dragHelperEls);
                          }
  
                          mouseFollower.hide(); // if the subclass is already using a mock event "helper", hide our own
                      }
                      else {
                          mouseFollower.show(); // otherwise, have the helper follow the mouse (no snapping)
                      }
  
                      if (isOrig) {
                          dropLocation = null; // needs to have moved hits to be a valid drop
                      }
                  },
                  hitOut: function () { // called before mouse moves to a different hit OR moved out of all hits
                      view.unrenderDrag(); // unrender whatever was done in renderDrag
                      mouseFollower.show(); // show in case we are moving out of all hits
                      dropLocation = null;
                  },
                  hitDone: function () { // Called after a hitOut OR before a dragEnd
                      enableCursor();
                  },
                  interactionEnd: function (ev) {
                      delete seg.component; // prevent side effects
  
                      // do revert animation if hasn't changed. calls a callback when finished (whether animation or not)
                      mouseFollower.stop(!dropLocation, function () {
                          if (isDragging) {
                              view.unrenderDrag();
                              _this.segDragStop(seg, ev);
                          }
  
                          if (dropLocation) {
                              // no need to re-show original, will rerender all anyways. esp important if eventRenderWait
                              view.reportSegDrop(seg, dropLocation, _this.largeUnit, el, ev);
                          }
                          else {
                              view.showEvent(event);
                          }
                      });
                      _this.segDragListener = null;
                  }
              });
  
              return dragListener;
          },
  
  
          // seg isn't draggable, but let's use a generic DragListener
          // simply for the delay, so it can be selected.
          // Has side effect of setting/unsetting `segDragListener`
          buildSegSelectListener: function (seg) {
              var _this = this;
              var view = this.view;
              var event = seg.event;
  
              if (this.segDragListener) {
                  return this.segDragListener;
              }
  
              var dragListener = this.segDragListener = new DragListener({
                  dragStart: function (ev) {
                      if (dragListener.isTouch && !view.isEventSelected(event)) {
                          // if not previously selected, will fire after a delay. then, select the event
                          view.selectEvent(event);
                      }
                  },
                  interactionEnd: function (ev) {
                      _this.segDragListener = null;
                  }
              });
  
              return dragListener;
          },
  
  
          // Called before event segment dragging starts
          segDragStart: function (seg, ev) {
              this.isDraggingSeg = true;
              this.view.publiclyTrigger('eventDragStart', seg.el[0], seg.event, ev, {}); // last argument is jqui dummy
          },
  
  
          // Called after event segment dragging stops
          segDragStop: function (seg, ev) {
              this.isDraggingSeg = false;
              this.view.publiclyTrigger('eventDragStop', seg.el[0], seg.event, ev, {}); // last argument is jqui dummy
          },
  
  
          // Given the spans an event drag began, and the span event was dropped, calculates the new zoned start/end/allDay
          // values for the event. Subclasses may override and set additional properties to be used by renderDrag.
          // A falsy returned value indicates an invalid drop.
          // DOES NOT consider overlap/constraint.
          computeEventDrop: function (startSpan, endSpan, event) {
              var calendar = this.view.calendar;
              var dragStart = startSpan.start;
              var dragEnd = endSpan.start;
              var delta;
              var dropLocation; // zoned event date properties
  
              if (dragStart.hasTime() === dragEnd.hasTime()) {
                  delta = this.diffDates(dragEnd, dragStart);
  
                  // if an all-day event was in a timed area and it was dragged to a different time,
                  // guarantee an end and adjust start/end to have times
                  if (event.allDay && durationHasTime(delta)) {
                      dropLocation = {
                          start: event.start.clone(),
                          end: calendar.getEventEnd(event), // will be an ambig day
                          allDay: false // for normalizeEventTimes
                      };
                      calendar.normalizeEventTimes(dropLocation);
                  }
                  // othewise, work off existing values
                  else {
                      dropLocation = pluckEventDateProps(event);
                  }
  
                  dropLocation.start.add(delta);
                  if (dropLocation.end) {
                      dropLocation.end.add(delta);
                  }
              }
              else {
                  // if switching from day <-> timed, start should be reset to the dropped date, and the end cleared
                  dropLocation = {
                      start: dragEnd.clone(),
                      end: null, // end should be cleared
                      allDay: !dragEnd.hasTime()
                  };
              }
  
              return dropLocation;
          },
  
  
          // Utility for apply dragOpacity to a jQuery set
          applyDragOpacity: function (els) {
              var opacity = this.view.opt('dragOpacity');
  
              if (opacity != null) {
                  els.css('opacity', opacity);
              }
          },
  
  
          /* External Element Dragging
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Called when a jQuery UI drag is initiated anywhere in the DOM
          externalDragStart: function (ev, ui) {
              var view = this.view;
              var el;
              var accept;
  
              if (view.opt('droppable')) { // only listen if this setting is on
                  el = $((ui ? ui.item : null) || ev.target);
  
                  // Test that the dragged element passes the dropAccept selector or filter function.
                  // FYI, the default is "*" (matches all)
                  accept = view.opt('dropAccept');
                  if ($.isFunction(accept) ? accept.call(el[0], el) : el.is(accept)) {
                      if (!this.isDraggingExternal) { // prevent double-listening if fired twice
                          this.listenToExternalDrag(el, ev, ui);
                      }
                  }
              }
          },
  
  
          // Called when a jQuery UI drag starts and it needs to be monitored for dropping
          listenToExternalDrag: function (el, ev, ui) {
              var _this = this;
              var calendar = this.view.calendar;
              var meta = getDraggedElMeta(el); // extra data about event drop, including possible event to create
              var dropLocation; // a null value signals an unsuccessful drag
  
              // listener that tracks mouse movement over date-associated pixel regions
              var dragListener = _this.externalDragListener = new HitDragListener(this, {
                  interactionStart: function () {
                      _this.isDraggingExternal = true;
                  },
                  hitOver: function (hit) {
                      dropLocation = _this.computeExternalDrop(
                          hit.component.getHitSpan(hit), // since we are querying the parent view, might not belong to this grid
                          meta
                      );
  
                      if ( // invalid hit?
                          dropLocation &&
                          !calendar.isExternalSpanAllowed(_this.eventToSpan(dropLocation), dropLocation, meta.eventProps)
                      ) {
                          disableCursor();
                          dropLocation = null;
                      }
  
                      if (dropLocation) {
                          _this.renderDrag(dropLocation); // called without a seg parameter
                      }
                  },
                  hitOut: function () {
                      dropLocation = null; // signal unsuccessful
                  },
                  hitDone: function () { // Called after a hitOut OR before a dragEnd
                      enableCursor();
                      _this.unrenderDrag();
                  },
                  interactionEnd: function (ev) {
                      if (dropLocation) { // element was dropped on a valid hit
                          _this.view.reportExternalDrop(meta, dropLocation, el, ev, ui);
                      }
                      _this.isDraggingExternal = false;
                      _this.externalDragListener = null;
                  }
              });
  
              dragListener.startDrag(ev); // start listening immediately
          },
  
  
          // Given a hit to be dropped upon, and misc data associated with the jqui drag (guaranteed to be a plain object),
          // returns the zoned start/end dates for the event that would result from the hypothetical drop. end might be null.
          // Returning a null value signals an invalid drop hit.
          // DOES NOT consider overlap/constraint.
          computeExternalDrop: function (span, meta) {
              var calendar = this.view.calendar;
              var dropLocation = {
                  start: calendar.applyTimezone(span.start), // simulate a zoned event start date
                  end: null
              };
  
              // if dropped on an all-day span, and element's metadata specified a time, set it
              if (meta.startTime && !dropLocation.start.hasTime()) {
                  dropLocation.start.time(meta.startTime);
              }
  
              if (meta.duration) {
                  dropLocation.end = dropLocation.start.clone().add(meta.duration);
              }
  
              return dropLocation;
          },
  
  
          /* Drag Rendering (for both events and an external elements)
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a visual indication of an event or external element being dragged.
          // `dropLocation` contains hypothetical start/end/allDay values the event would have if dropped. end can be null.
          // `seg` is the internal segment object that is being dragged. If dragging an external element, `seg` is null.
          // A truthy returned value indicates this method has rendered a helper element.
          // Must return elements used for any mock events.
          renderDrag: function (dropLocation, seg) {
              // subclasses must implement
          },
  
  
          // Unrenders a visual indication of an event or external element being dragged
          unrenderDrag: function () {
              // subclasses must implement
          },
  
  
          /* Resizing
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Creates a listener that tracks the user as they resize an event segment.
          // Generic enough to work with any type of Grid.
          buildSegResizeListener: function (seg, isStart) {
              var _this = this;
              var view = this.view;
              var calendar = view.calendar;
              var el = seg.el;
              var event = seg.event;
              var eventEnd = calendar.getEventEnd(event);
              var isDragging;
              var resizeLocation; // zoned event date properties. falsy if invalid resize
  
              // Tracks mouse movement over the *grid's* coordinate map
              var dragListener = this.segResizeListener = new HitDragListener(this, {
                  scroll: view.opt('dragScroll'),
                  subjectEl: el,
                  interactionStart: function () {
                      isDragging = false;
                  },
                  dragStart: function (ev) {
                      isDragging = true;
                      _this.handleSegMouseout(seg, ev); // ensure a mouseout on the manipulated event has been reported
                      _this.segResizeStart(seg, ev);
                  },
                  hitOver: function (hit, isOrig, origHit) {
                      var origHitSpan = _this.getHitSpan(origHit);
                      var hitSpan = _this.getHitSpan(hit);
  
                      resizeLocation = isStart ?
                          _this.computeEventStartResize(origHitSpan, hitSpan, event) :
                          _this.computeEventEndResize(origHitSpan, hitSpan, event);
  
                      if (resizeLocation) {
                          if (!calendar.isEventSpanAllowed(_this.eventToSpan(resizeLocation), event)) {
                              disableCursor();
                              resizeLocation = null;
                          }
                          // no change? (FYI, event dates might have zones)
                          else if (
                              resizeLocation.start.isSame(event.start.clone().stripZone()) &&
                              resizeLocation.end.isSame(eventEnd.clone().stripZone())
                          ) {
                              resizeLocation = null;
                          }
                      }
  
                      if (resizeLocation) {
                          view.hideEvent(event);
                          _this.renderEventResize(resizeLocation, seg);
                      }
                  },
                  hitOut: function () { // called before mouse moves to a different hit OR moved out of all hits
                      resizeLocation = null;
                      view.showEvent(event); // for when out-of-bounds. show original
                  },
                  hitDone: function () { // resets the rendering to show the original event
                      _this.unrenderEventResize();
                      enableCursor();
                  },
                  interactionEnd: function (ev) {
                      if (isDragging) {
                          _this.segResizeStop(seg, ev);
                      }
  
                      if (resizeLocation) { // valid date to resize to?
                          // no need to re-show original, will rerender all anyways. esp important if eventRenderWait
                          view.reportSegResize(seg, resizeLocation, _this.largeUnit, el, ev);
                      }
                      else {
                          view.showEvent(event);
                      }
                      _this.segResizeListener = null;
                  }
              });
  
              return dragListener;
          },
  
  
          // Called before event segment resizing starts
          segResizeStart: function (seg, ev) {
              this.isResizingSeg = true;
              this.view.publiclyTrigger('eventResizeStart', seg.el[0], seg.event, ev, {}); // last argument is jqui dummy
          },
  
  
          // Called after event segment resizing stops
          segResizeStop: function (seg, ev) {
              this.isResizingSeg = false;
              this.view.publiclyTrigger('eventResizeStop', seg.el[0], seg.event, ev, {}); // last argument is jqui dummy
          },
  
  
          // Returns new date-information for an event segment being resized from its start
          computeEventStartResize: function (startSpan, endSpan, event) {
              return this.computeEventResize('start', startSpan, endSpan, event);
          },
  
  
          // Returns new date-information for an event segment being resized from its end
          computeEventEndResize: function (startSpan, endSpan, event) {
              return this.computeEventResize('end', startSpan, endSpan, event);
          },
  
  
          // Returns new zoned date information for an event segment being resized from its start OR end
          // `type` is either 'start' or 'end'.
          // DOES NOT consider overlap/constraint.
          computeEventResize: function (type, startSpan, endSpan, event) {
              var calendar = this.view.calendar;
              var delta = this.diffDates(endSpan[type], startSpan[type]);
              var resizeLocation; // zoned event date properties
              var defaultDuration;
  
              // build original values to work from, guaranteeing a start and end
              resizeLocation = {
                  start: event.start.clone(),
                  end: calendar.getEventEnd(event),
                  allDay: event.allDay
              };
  
              // if an all-day event was in a timed area and was resized to a time, adjust start/end to have times
              if (resizeLocation.allDay && durationHasTime(delta)) {
                  resizeLocation.allDay = false;
                  calendar.normalizeEventTimes(resizeLocation);
              }
  
              resizeLocation[type].add(delta); // apply delta to start or end
  
              // if the event was compressed too small, find a new reasonable duration for it
              if (!resizeLocation.start.isBefore(resizeLocation.end)) {
  
                  defaultDuration =
                      this.minResizeDuration || // TODO: hack
                      (event.allDay ?
                          calendar.defaultAllDayEventDuration :
                          calendar.defaultTimedEventDuration);
  
                  if (type == 'start') { // resizing the start?
                      resizeLocation.start = resizeLocation.end.clone().subtract(defaultDuration);
                  }
                  else { // resizing the end?
                      resizeLocation.end = resizeLocation.start.clone().add(defaultDuration);
                  }
              }
  
              return resizeLocation;
          },
  
  
          // Renders a visual indication of an event being resized.
          // `range` has the updated dates of the event. `seg` is the original segment object involved in the drag.
          // Must return elements used for any mock events.
          renderEventResize: function (range, seg) {
              // subclasses must implement
          },
  
  
          // Unrenders a visual indication of an event being resized.
          unrenderEventResize: function () {
              // subclasses must implement
          },
  
  
          /* Rendering Utils
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Compute the text that should be displayed on an event's element.
          // `range` can be the Event object itself, or something range-like, with at least a `start`.
          // If event times are disabled, or the event has no time, will return a blank string.
          // If not specified, formatStr will default to the eventTimeFormat setting,
          // and displayEnd will default to the displayEventEnd setting.
          getEventTimeText: function (range, formatStr, displayEnd) {
  
              if (formatStr == null) {
                  formatStr = this.eventTimeFormat;
              }
  
              if (displayEnd == null) {
                  displayEnd = this.displayEventEnd;
              }
  
              if (this.displayEventTime && range.start.hasTime()) {
                  if (displayEnd && range.end) {
                      return this.view.formatRange(range, formatStr);
                  }
                  else {
                      return range.start.format(formatStr);
                  }
              }
  
              return '';
          },
  
  
          // Generic utility for generating the HTML classNames for an event segment's element
          getSegClasses: function (seg, isDraggable, isResizable) {
              var view = this.view;
              var classes = [
                  'fc-event',
                  seg.isStart ? 'fc-start' : 'fc-not-start',
                  seg.isEnd ? 'fc-end' : 'fc-not-end'
              ].concat(this.getSegCustomClasses(seg));
  
              if (isDraggable) {
                  classes.push('fc-draggable');
              }
              if (isResizable) {
                  classes.push('fc-resizable');
              }
  
              // event is currently selected? attach a className.
              if (view.isEventSelected(seg.event)) {
                  classes.push('fc-selected');
              }
  
              return classes;
          },
  
  
          // List of classes that were defined by the caller of the API in some way
          getSegCustomClasses: function (seg) {
              var event = seg.event;
  
              return [].concat(
                  event.className, // guaranteed to be an array
                  event.source ? event.source.className : []
              );
          },
  
  
          // Utility for generating event skin-related CSS properties
          getSegSkinCss: function (seg) {
              return {
                  'background-color': this.getSegBackgroundColor(seg),
                  'border-color': this.getSegBorderColor(seg),
                  color: this.getSegTextColor(seg)
              };
          },
  
  
          // Queries for caller-specified color, then falls back to default
          getSegBackgroundColor: function (seg) {
              return seg.event.backgroundColor ||
                  seg.event.color ||
                  this.getSegDefaultBackgroundColor(seg);
          },
  
  
          getSegDefaultBackgroundColor: function (seg) {
              var source = seg.event.source || {};
  
              return source.backgroundColor ||
                  source.color ||
                  this.view.opt('eventBackgroundColor') ||
                  this.view.opt('eventColor');
          },
  
  
          // Queries for caller-specified color, then falls back to default
          getSegBorderColor: function (seg) {
              return seg.event.borderColor ||
                  seg.event.color ||
                  this.getSegDefaultBorderColor(seg);
          },
  
  
          getSegDefaultBorderColor: function (seg) {
              var source = seg.event.source || {};
  
              return source.borderColor ||
                  source.color ||
                  this.view.opt('eventBorderColor') ||
                  this.view.opt('eventColor');
          },
  
  
          // Queries for caller-specified color, then falls back to default
          getSegTextColor: function (seg) {
              return seg.event.textColor ||
                  this.getSegDefaultTextColor(seg);
          },
  
  
          getSegDefaultTextColor: function (seg) {
              var source = seg.event.source || {};
  
              return source.textColor ||
                  this.view.opt('eventTextColor');
          },
  
  
          /* Converting events -> eventRange -> eventSpan -> eventSegs
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Generates an array of segments for the given single event
          // Can accept an event "location" as well (which only has start/end and no allDay)
          eventToSegs: function (event) {
              return this.eventsToSegs([event]);
          },
  
  
          eventToSpan: function (event) {
              return this.eventToSpans(event)[0];
          },
  
  
          // Generates spans (always unzoned) for the given event.
          // Does not do any inverting for inverse-background events.
          // Can accept an event "location" as well (which only has start/end and no allDay)
          eventToSpans: function (event) {
              var range = this.eventToRange(event);
              return this.eventRangeToSpans(range, event);
          },
  
  
          // Converts an array of event objects into an array of event segment objects.
          // A custom `segSliceFunc` may be given for arbitrarily slicing up events.
          // Doesn't guarantee an order for the resulting array.
          eventsToSegs: function (allEvents, segSliceFunc) {
              var _this = this;
              var eventsById = groupEventsById(allEvents);
              var segs = [];
  
              $.each(eventsById, function (id, events) {
                  var ranges = [];
                  var i;
  
                  for (i = 0; i < events.length; i++) {
                      ranges.push(_this.eventToRange(events[i]));
                  }
  
                  // inverse-background events (utilize only the first event in calculations)
                  if (isInverseBgEvent(events[0])) {
                      ranges = _this.invertRanges(ranges);
  
                      for (i = 0; i < ranges.length; i++) {
                          segs.push.apply(segs, // append to
                              _this.eventRangeToSegs(ranges[i], events[0], segSliceFunc));
                      }
                  }
                  // normal event ranges
                  else {
                      for (i = 0; i < ranges.length; i++) {
                          segs.push.apply(segs, // append to
                              _this.eventRangeToSegs(ranges[i], events[i], segSliceFunc));
                      }
                  }
              });
  
              return segs;
          },
  
  
          // Generates the unzoned start/end dates an event appears to occupy
          // Can accept an event "location" as well (which only has start/end and no allDay)
          eventToRange: function (event) {
              var calendar = this.view.calendar;
              var start = event.start.clone().stripZone();
              var end = (
                  event.end ?
                      event.end.clone() :
                      // derive the end from the start and allDay. compute allDay if necessary
                      calendar.getDefaultEventEnd(
                          event.allDay != null ?
                              event.allDay :
                              !event.start.hasTime(),
                          event.start
                      )
              ).stripZone();
  
              // hack: dynamic locale change forgets to upate stored event localed
              calendar.localizeMoment(start);
              calendar.localizeMoment(end);
  
              return {start: start, end: end};
          },
  
  
          // Given an event's range (unzoned start/end), and the event itself,
          // slice into segments (using the segSliceFunc function if specified)
          eventRangeToSegs: function (range, event, segSliceFunc) {
              var spans = this.eventRangeToSpans(range, event);
              var segs = [];
              var i;
  
              for (i = 0; i < spans.length; i++) {
                  segs.push.apply(segs, // append to
                      this.eventSpanToSegs(spans[i], event, segSliceFunc));
              }
  
              return segs;
          },
  
  
          // Given an event's unzoned date range, return an array of "span" objects.
          // Subclasses can override.
          eventRangeToSpans: function (range, event) {
              return [$.extend({}, range)]; // copy into a single-item array
          },
  
  
          // Given an event's span (unzoned start/end and other misc data), and the event itself,
          // slices into segments and attaches event-derived properties to them.
          eventSpanToSegs: function (span, event, segSliceFunc) {
              var segs = segSliceFunc ? segSliceFunc(span) : this.spanToSegs(span);
              var i, seg;
  
              for (i = 0; i < segs.length; i++) {
                  seg = segs[i];
                  seg.event = event;
                  seg.eventStartMS = +span.start; // TODO: not the best name after making spans unzoned
                  seg.eventDurationMS = span.end - span.start;
              }
  
              return segs;
          },
  
  
          // Produces a new array of range objects that will cover all the time NOT covered by the given ranges.
          // SIDE EFFECT: will mutate the given array and will use its date references.
          invertRanges: function (ranges) {
              var view = this.view;
              var viewStart = view.start.clone(); // need a copy
              var viewEnd = view.end.clone(); // need a copy
              var inverseRanges = [];
              var start = viewStart; // the end of the previous range. the start of the new range
              var i, range;
  
              // ranges need to be in order. required for our date-walking algorithm
              ranges.sort(compareRanges);
  
              for (i = 0; i < ranges.length; i++) {
                  range = ranges[i];
  
                  // add the span of time before the event (if there is any)
                  if (range.start > start) { // compare millisecond time (skip any ambig logic)
                      inverseRanges.push({
                          start: start,
                          end: range.start
                      });
                  }
  
                  start = range.end;
              }
  
              // add the span of time after the last event (if there is any)
              if (start < viewEnd) { // compare millisecond time (skip any ambig logic)
                  inverseRanges.push({
                      start: start,
                      end: viewEnd
                  });
              }
  
              return inverseRanges;
          },
  
  
          sortEventSegs: function (segs) {
              segs.sort(proxy(this, 'compareEventSegs'));
          },
  
  
          // A cmp function for determining which segments should take visual priority
          compareEventSegs: function (seg1, seg2) {
              return seg1.eventStartMS - seg2.eventStartMS || // earlier events go first
                  seg2.eventDurationMS - seg1.eventDurationMS || // tie? longer events go first
                  seg2.event.allDay - seg1.event.allDay || // tie? put all-day events first (booleans cast to 0/1)
                  compareByFieldSpecs(seg1.event, seg2.event, this.view.eventOrderSpecs);
          }
  
      });
  
  
      /* Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
  
      function pluckEventDateProps(event) {
          return {
              start: event.start.clone(),
              end: event.end ? event.end.clone() : null,
              allDay: event.allDay // keep it the same
          };
      }
  
      FC.pluckEventDateProps = pluckEventDateProps;
  
  
      function isBgEvent(event) { // returns true if background OR inverse-background
          var rendering = getEventRendering(event);
          return rendering === 'background' || rendering === 'inverse-background';
      }
  
      FC.isBgEvent = isBgEvent; // export
  
  
      function isInverseBgEvent(event) {
          return getEventRendering(event) === 'inverse-background';
      }
  
  
      function getEventRendering(event) {
          return firstDefined((event.source || {}).rendering, event.rendering);
      }
  
  
      function groupEventsById(events) {
          var eventsById = {};
          var i, event;
  
          for (i = 0; i < events.length; i++) {
              event = events[i];
              (eventsById[event._id] || (eventsById[event._id] = [])).push(event);
          }
  
          return eventsById;
      }
  
  
  // A cmp function for determining which non-inverted "ranges" (see above) happen earlier
      function compareRanges(range1, range2) {
          return range1.start - range2.start; // earlier ranges go first
      }
  
  
      /* External-Dragging-Element Data
  ----------------------------------------------------------------------------------------------------------------------*/
  
  // Require all HTML5 data-* attributes used by FullCalendar to have this prefix.
  // A value of '' will query attributes like data-event. A value of 'fc' will query attributes like data-fc-event.
      FC.dataAttrPrefix = '';
  
  // Given a jQuery element that might represent a dragged FullCalendar event, returns an intermediate data structure
  // to be used for Event Object creation.
  // A defined `.eventProps`, even when empty, indicates that an event should be created.
      function getDraggedElMeta(el) {
          var prefix = FC.dataAttrPrefix;
          var eventProps; // properties for creating the event, not related to date/time
          var startTime; // a Duration
          var duration;
          var stick;
  
          if (prefix) {
              prefix += '-';
          }
          eventProps = el.data(prefix + 'event') || null;
  
          if (eventProps) {
              if (typeof eventProps === 'object') {
                  eventProps = $.extend({}, eventProps); // make a copy
              }
              else { // something like 1 or true. still signal event creation
                  eventProps = {};
              }
  
              // pluck special-cased date/time properties
              startTime = eventProps.start;
              if (startTime == null) {
                  startTime = eventProps.time;
              } // accept 'time' as well
              duration = eventProps.duration;
              stick = eventProps.stick;
              delete eventProps.start;
              delete eventProps.time;
              delete eventProps.duration;
              delete eventProps.stick;
          }
  
          // fallback to standalone attribute values for each of the date/time properties
          if (startTime == null) {
              startTime = el.data(prefix + 'start');
          }
          if (startTime == null) {
              startTime = el.data(prefix + 'time');
          } // accept 'time' as well
          if (duration == null) {
              duration = el.data(prefix + 'duration');
          }
          if (stick == null) {
              stick = el.data(prefix + 'stick');
          }
  
          // massage into correct data types
          startTime = startTime != null ? moment.duration(startTime) : null;
          duration = duration != null ? moment.duration(duration) : null;
          stick = Boolean(stick);
  
          return {eventProps: eventProps, startTime: startTime, duration: duration, stick: stick};
      }
  
  
      ;
      ;
  
      /*
  A set of rendering and date-related methods for a visual component comprised of one or more rows of day columns.
  Prerequisite: the object being mixed into needs to be a *Grid*
  */
      var DayTableMixin = FC.DayTableMixin = {
  
          breakOnWeeks: false, // should create a new row for each week?
          dayDates: null, // whole-day dates for each column. left to right
          dayIndices: null, // for each day from start, the offset
          daysPerRow: null,
          rowCnt: null,
          colCnt: null,
          colHeadFormat: null,
  
  
          // Populates internal variables used for date calculation and rendering
          updateDayTable: function () {
              var view = this.view;
              var date = this.start.clone();
              var dayIndex = -1;
              var dayIndices = [];
              var dayDates = [];
              var daysPerRow;
              var firstDay;
              var rowCnt;
  
              while (date.isBefore(this.end)) { // loop each day from start to end
                  if (view.isHiddenDay(date)) {
                      dayIndices.push(dayIndex + 0.5); // mark that it's between indices
                  }
                  else {
                      dayIndex++;
                      dayIndices.push(dayIndex);
                      dayDates.push(date.clone());
                  }
                  date.add(1, 'days');
              }
  
              if (this.breakOnWeeks) {
                  // count columns until the day-of-week repeats
                  firstDay = dayDates[0].day();
                  for (daysPerRow = 1; daysPerRow < dayDates.length; daysPerRow++) {
                      if (dayDates[daysPerRow].day() == firstDay) {
                          break;
                      }
                  }
                  rowCnt = Math.ceil(dayDates.length / daysPerRow);
              }
              else {
                  rowCnt = 1;
                  daysPerRow = dayDates.length;
              }
  
              this.dayDates = dayDates;
              this.dayIndices = dayIndices;
              this.daysPerRow = daysPerRow;
              this.rowCnt = rowCnt;
  
              this.updateDayTableCols();
          },
  
  
          // Computes and assigned the colCnt property and updates any options that may be computed from it
          updateDayTableCols: function () {
              this.colCnt = this.computeColCnt();
              this.colHeadFormat = this.view.opt('columnFormat') || this.computeColHeadFormat();
          },
  
  
          // Determines how many columns there should be in the table
          computeColCnt: function () {
              return this.daysPerRow;
          },
  
  
          // Computes the ambiguously-timed moment for the given cell
          getCellDate: function (row, col) {
              return this.dayDates[
                  this.getCellDayIndex(row, col)
                  ].clone();
          },
  
  
          // Computes the ambiguously-timed date range for the given cell
          getCellRange: function (row, col) {
              var start = this.getCellDate(row, col);
              var end = start.clone().add(1, 'days');
  
              return {start: start, end: end};
          },
  
  
          // Returns the number of day cells, chronologically, from the first of the grid (0-based)
          getCellDayIndex: function (row, col) {
              return row * this.daysPerRow + this.getColDayIndex(col);
          },
  
  
          // Returns the numner of day cells, chronologically, from the first cell in *any given row*
          getColDayIndex: function (col) {
              if (this.isRTL) {
                  return this.colCnt - 1 - col;
              }
              else {
                  return col;
              }
          },
  
  
          // Given a date, returns its chronolocial cell-index from the first cell of the grid.
          // If the date lies between cells (because of hiddenDays), returns a floating-point value between offsets.
          // If before the first offset, returns a negative number.
          // If after the last offset, returns an offset past the last cell offset.
          // Only works for *start* dates of cells. Will not work for exclusive end dates for cells.
          getDateDayIndex: function (date) {
              var dayIndices = this.dayIndices;
              var dayOffset = date.diff(this.start, 'days');
  
              if (dayOffset < 0) {
                  return dayIndices[0] - 1;
              }
              else if (dayOffset >= dayIndices.length) {
                  return dayIndices[dayIndices.length - 1] + 1;
              }
              else {
                  return dayIndices[dayOffset];
              }
          },
  
  
          /* Options
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Computes a default column header formatting string if `colFormat` is not explicitly defined
          computeColHeadFormat: function () {
              // if more than one week row, or if there are a lot of columns with not much space,
              // put just the day numbers will be in each cell
              if (this.rowCnt > 1 || this.colCnt > 10) {
                  return 'ddd'; // "Sat"
              }
              // multiple days, so full single date string WON'T be in title text
              else if (this.colCnt > 1) {
                  return this.view.opt('dayOfMonthFormat'); // "Sat 12/10"
              }
              // single day, so full single date string will probably be in title text
              else {
                  return 'dddd'; // "Saturday"
              }
          },
  
  
          /* Slicing
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Slices up a date range into a segment for every week-row it intersects with
          sliceRangeByRow: function (range) {
              var daysPerRow = this.daysPerRow;
              var normalRange = this.view.computeDayRange(range); // make whole-day range, considering nextDayThreshold
              var rangeFirst = this.getDateDayIndex(normalRange.start); // inclusive first index
              var rangeLast = this.getDateDayIndex(normalRange.end.clone().subtract(1, 'days')); // inclusive last index
              var segs = [];
              var row;
              var rowFirst, rowLast; // inclusive day-index range for current row
              var segFirst, segLast; // inclusive day-index range for segment
  
              for (row = 0; row < this.rowCnt; row++) {
                  rowFirst = row * daysPerRow;
                  rowLast = rowFirst + daysPerRow - 1;
  
                  // intersect segment's offset range with the row's
                  segFirst = Math.max(rangeFirst, rowFirst);
                  segLast = Math.min(rangeLast, rowLast);
  
                  // deal with in-between indices
                  segFirst = Math.ceil(segFirst); // in-between starts round to next cell
                  segLast = Math.floor(segLast); // in-between ends round to prev cell
  
                  if (segFirst <= segLast) { // was there any intersection with the current row?
                      segs.push({
                          row: row,
  
                          // normalize to start of row
                          firstRowDayIndex: segFirst - rowFirst,
                          lastRowDayIndex: segLast - rowFirst,
  
                          // must be matching integers to be the segment's start/end
                          isStart: segFirst === rangeFirst,
                          isEnd: segLast === rangeLast
                      });
                  }
              }
  
              return segs;
          },
  
  
          // Slices up a date range into a segment for every day-cell it intersects with.
          // TODO: make more DRY with sliceRangeByRow somehow.
          sliceRangeByDay: function (range) {
              var daysPerRow = this.daysPerRow;
              var normalRange = this.view.computeDayRange(range); // make whole-day range, considering nextDayThreshold
              var rangeFirst = this.getDateDayIndex(normalRange.start); // inclusive first index
              var rangeLast = this.getDateDayIndex(normalRange.end.clone().subtract(1, 'days')); // inclusive last index
              var segs = [];
              var row;
              var rowFirst, rowLast; // inclusive day-index range for current row
              var i;
              var segFirst, segLast; // inclusive day-index range for segment
  
              for (row = 0; row < this.rowCnt; row++) {
                  rowFirst = row * daysPerRow;
                  rowLast = rowFirst + daysPerRow - 1;
  
                  for (i = rowFirst; i <= rowLast; i++) {
  
                      // intersect segment's offset range with the row's
                      segFirst = Math.max(rangeFirst, i);
                      segLast = Math.min(rangeLast, i);
  
                      // deal with in-between indices
                      segFirst = Math.ceil(segFirst); // in-between starts round to next cell
                      segLast = Math.floor(segLast); // in-between ends round to prev cell
  
                      if (segFirst <= segLast) { // was there any intersection with the current row?
                          segs.push({
                              row: row,
  
                              // normalize to start of row
                              firstRowDayIndex: segFirst - rowFirst,
                              lastRowDayIndex: segLast - rowFirst,
  
                              // must be matching integers to be the segment's start/end
                              isStart: segFirst === rangeFirst,
                              isEnd: segLast === rangeLast
                          });
                      }
                  }
              }
  
              return segs;
          },
  
  
          /* Header Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderHeadHtml: function () {
              var view = this.view;
  
              return '' +
                  '<div class="fc-row ' + view.widgetHeaderClass + '">' +
                  '<table>' +
                  '<thead>' +
                  this.renderHeadTrHtml() +
                  '</thead>' +
                  '</table>' +
                  '</div>';
          },
  
  
          renderHeadIntroHtml: function () {
              return this.renderIntroHtml(); // fall back to generic
          },
  
  
          renderHeadTrHtml: function () {
              return '' +
                  '<tr>' +
                  (this.isRTL ? '' : this.renderHeadIntroHtml()) +
                  this.renderHeadDateCellsHtml() +
                  (this.isRTL ? this.renderHeadIntroHtml() : '') +
                  '</tr>';
          },
  
  
          renderHeadDateCellsHtml: function () {
              var htmls = [];
              var col, date;
  
              for (col = 0; col < this.colCnt; col++) {
                  date = this.getCellDate(0, col);
                  htmls.push(this.renderHeadDateCellHtml(date));
              }
  
              return htmls.join('');
          },
  
  
          // TODO: when internalApiVersion, accept an object for HTML attributes
          // (colspan should be no different)
          renderHeadDateCellHtml: function (date, colspan, otherAttrs) {
              var view = this.view;
              var classNames = [
                  'fc-day-header',
                  view.widgetHeaderClass
              ];
  
              // if only one row of days, the classNames on the header can represent the specific days beneath
              if (this.rowCnt === 1) {
                  classNames = classNames.concat(
                      // includes the day-of-week class
                      // noThemeHighlight=true (don't highlight the header)
                      this.getDayClasses(date, true)
                  );
              }
              else {
                  classNames.push('fc-' + dayIDs[date.day()]); // only add the day-of-week class
              }
  
              return '' +
                  '<th class="' + classNames.join(' ') + '"' +
                  (this.rowCnt === 1 ?
                      ' data-date="' + date.format('YYYY-MM-DD') + '"' :
                      '') +
                  (colspan > 1 ?
                      ' colspan="' + colspan + '"' :
                      '') +
                  (otherAttrs ?
                      ' ' + otherAttrs :
                      '') +
                  '>' +
                  // don't make a link if the heading could represent multiple days, or if there's only one day (forceOff)
                  view.buildGotoAnchorHtml(
                      {date: date, forceOff: this.rowCnt > 1 || this.colCnt === 1},
                      htmlEscape(date.format(this.colHeadFormat)) // inner HTML
                  ) +
                  '</th>';
          },
  
  
          /* Background Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderBgTrHtml: function (row) {
              return '' +
                  '<tr>' +
                  (this.isRTL ? '' : this.renderBgIntroHtml(row)) +
                  this.renderBgCellsHtml(row) +
                  (this.isRTL ? this.renderBgIntroHtml(row) : '') +
                  '</tr>';
          },
  
  
          renderBgIntroHtml: function (row) {
              return this.renderIntroHtml(); // fall back to generic
          },
  
  
          renderBgCellsHtml: function (row) {
              var htmls = [];
              var col, date;
  
              for (col = 0; col < this.colCnt; col++) {
                  date = this.getCellDate(row, col);
                  htmls.push(this.renderBgCellHtml(date));
              }
  
              return htmls.join('');
          },
  
  
          renderBgCellHtml: function (date, otherAttrs) {
              var view = this.view;
              var classes = this.getDayClasses(date);
  
              classes.unshift('fc-day', view.widgetContentClass);
  
              return '<td class="' + classes.join(' ') + '"' +
                  ' data-date="' + date.format('YYYY-MM-DD') + '"' + // if date has a time, won't format it
                  (otherAttrs ?
                      ' ' + otherAttrs :
                      '') +
                  '></td>';
          },
  
  
          /* Generic
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Generates the default HTML intro for any row. User classes should override
          renderIntroHtml: function () {
          },
  
  
          // TODO: a generic method for dealing with <tr>, RTL, intro
          // when increment internalApiVersion
          // wrapTr (scheduler)
  
  
          /* Utils
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Applies the generic "intro" and "outro" HTML to the given cells.
          // Intro means the leftmost cell when the calendar is LTR and the rightmost cell when RTL. Vice-versa for outro.
          bookendCells: function (trEl) {
              var introHtml = this.renderIntroHtml();
  
              if (introHtml) {
                  if (this.isRTL) {
                      trEl.append(introHtml);
                  }
                  else {
                      trEl.prepend(introHtml);
                  }
              }
          }
  
      };
  
      ;
      ;
  
      /* A component that renders a grid of whole-days that runs horizontally. There can be multiple rows, one per week.
  ----------------------------------------------------------------------------------------------------------------------*/
  
      var DayGrid = FC.DayGrid = Grid.extend(DayTableMixin, {
  
          numbersVisible: false, // should render a row for day/week numbers? set by outside view. TODO: make internal
          bottomCoordPadding: 0, // hack for extending the hit area for the last row of the coordinate grid
  
          rowEls: null, // set of fake row elements
          cellEls: null, // set of whole-day elements comprising the row's background
          helperEls: null, // set of cell skeleton elements for rendering the mock event "helper"
  
          rowCoordCache: null,
          colCoordCache: null,
  
  
          // Renders the rows and columns into the component's `this.el`, which should already be assigned.
          // isRigid determins whether the individual rows should ignore the contents and be a constant height.
          // Relies on the view's colCnt and rowCnt. In the future, this component should probably be self-sufficient.
          renderDates: function (isRigid) {
              var view = this.view;
              var rowCnt = this.rowCnt;
              var colCnt = this.colCnt;
              var html = '';
              var row;
              var col;
  
              for (row = 0; row < rowCnt; row++) {
                  html += this.renderDayRowHtml(row, isRigid);
              }
              this.el.html(html);
  
              this.rowEls = this.el.find('.fc-row');
              this.cellEls = this.el.find('.fc-day');
  
              this.rowCoordCache = new CoordCache({
                  els: this.rowEls,
                  isVertical: true
              });
              this.colCoordCache = new CoordCache({
                  els: this.cellEls.slice(0, this.colCnt), // only the first row
                  isHorizontal: true
              });
  
              // trigger dayRender with each cell's element
              for (row = 0; row < rowCnt; row++) {
                  for (col = 0; col < colCnt; col++) {
                      view.publiclyTrigger(
                          'dayRender',
                          null,
                          this.getCellDate(row, col),
                          this.getCellEl(row, col)
                      );
                  }
              }
          },
  
  
          unrenderDates: function () {
              this.removeSegPopover();
          },
  
  
          renderBusinessHours: function () {
              var segs = this.buildBusinessHourSegs(true); // wholeDay=true
              this.renderFill('businessHours', segs, 'bgevent');
          },
  
  
          unrenderBusinessHours: function () {
              this.unrenderFill('businessHours');
          },
  
  
          // Generates the HTML for a single row, which is a div that wraps a table.
          // `row` is the row number.
          renderDayRowHtml: function (row, isRigid) {
              var view = this.view;
              var classes = ['fc-row', 'fc-week', view.widgetContentClass];
  
              if (isRigid) {
                  classes.push('fc-rigid');
              }
  
              return '' +
                  '<div class="' + classes.join(' ') + '">' +
                  '<div class="fc-bg">' +
                  '<table>' +
                  this.renderBgTrHtml(row) +
                  '</table>' +
                  '</div>' +
                  '<div class="fc-content-skeleton">' +
                  '<table>' +
                  (this.numbersVisible ?
                          '<thead>' +
                          this.renderNumberTrHtml(row) +
                          '</thead>' :
                          ''
                  ) +
                  '</table>' +
                  '</div>' +
                  '</div>';
          },
  
  
          /* Grid Number Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderNumberTrHtml: function (row) {
              return '' +
                  '<tr>' +
                  (this.isRTL ? '' : this.renderNumberIntroHtml(row)) +
                  this.renderNumberCellsHtml(row) +
                  (this.isRTL ? this.renderNumberIntroHtml(row) : '') +
                  '</tr>';
          },
  
  
          renderNumberIntroHtml: function (row) {
              return this.renderIntroHtml();
          },
  
  
          renderNumberCellsHtml: function (row) {
              var htmls = [];
              var col, date;
  
              for (col = 0; col < this.colCnt; col++) {
                  date = this.getCellDate(row, col);
                  htmls.push(this.renderNumberCellHtml(date));
              }
  
              return htmls.join('');
          },
  
  
          // Generates the HTML for the <td>s of the "number" row in the DayGrid's content skeleton.
          // The number row will only exist if either day numbers or week numbers are turned on.
          renderNumberCellHtml: function (date) {
              var html = '';
              var classes;
              var weekCalcFirstDoW;
  
              if (!this.view.dayNumbersVisible && !this.view.cellWeekNumbersVisible) {
                  // no numbers in day cell (week number must be along the side)
                  return '<td/>'; //  will create an empty space above events :(
              }
  
              classes = this.getDayClasses(date);
              classes.unshift('fc-day-top');
  
              if (this.view.cellWeekNumbersVisible) {
                  // To determine the day of week number change under ISO, we cannot
                  // rely on moment.js methods such as firstDayOfWeek() or weekday(),
                  // because they rely on the locale's dow (possibly overridden by
                  // our firstDay option), which may not be Monday. We cannot change
                  // dow, because that would affect the calendar start day as well.
                  if (date._locale._fullCalendar_weekCalc === 'ISO') {
                      weekCalcFirstDoW = 1;  // Monday by ISO 8601 definition
                  }
                  else {
                      weekCalcFirstDoW = date._locale.firstDayOfWeek();
                  }
              }
  
              html += '<td class="' + classes.join(' ') + '" data-date="' + date.format() + '">';
  
              if (this.view.cellWeekNumbersVisible && (date.day() == weekCalcFirstDoW)) {
                  html += this.view.buildGotoAnchorHtml(
                      {date: date, type: 'week'},
                      {'class': 'fc-week-number'},
                      date.format('w') // inner HTML
                  );
              }
  
              if (this.view.dayNumbersVisible) {
                  html += this.view.buildGotoAnchorHtml(
                      date,
                      {'class': 'fc-day-number'},
                      date.date() // inner HTML
                  );
              }
  
              html += '</td>';
  
              return html;
          },
  
  
          /* Options
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Computes a default event time formatting string if `timeFormat` is not explicitly defined
          computeEventTimeFormat: function () {
              return this.view.opt('extraSmallTimeFormat'); // like "6p" or "6:30p"
          },
  
  
          // Computes a default `displayEventEnd` value if one is not expliclty defined
          computeDisplayEventEnd: function () {
              return this.colCnt == 1; // we'll likely have space if there's only one day
          },
  
  
          /* Dates
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          rangeUpdated: function () {
              this.updateDayTable();
          },
  
  
          // Slices up the given span (unzoned start/end with other misc data) into an array of segments
          spanToSegs: function (span) {
              var segs = this.sliceRangeByRow(span);
              var i, seg;
  
              for (i = 0; i < segs.length; i++) {
                  seg = segs[i];
                  if (this.isRTL) {
                      seg.leftCol = this.daysPerRow - 1 - seg.lastRowDayIndex;
                      seg.rightCol = this.daysPerRow - 1 - seg.firstRowDayIndex;
                  }
                  else {
                      seg.leftCol = seg.firstRowDayIndex;
                      seg.rightCol = seg.lastRowDayIndex;
                  }
              }
  
              return segs;
          },
  
  
          /* Hit System
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          prepareHits: function () {
              this.colCoordCache.build();
              this.rowCoordCache.build();
              this.rowCoordCache.bottoms[this.rowCnt - 1] += this.bottomCoordPadding; // hack
          },
  
  
          releaseHits: function () {
              this.colCoordCache.clear();
              this.rowCoordCache.clear();
          },
  
  
          queryHit: function (leftOffset, topOffset) {
              if (this.colCoordCache.isLeftInBounds(leftOffset) && this.rowCoordCache.isTopInBounds(topOffset)) {
                  var col = this.colCoordCache.getHorizontalIndex(leftOffset);
                  var row = this.rowCoordCache.getVerticalIndex(topOffset);
  
                  if (row != null && col != null) {
                      return this.getCellHit(row, col);
                  }
              }
          },
  
  
          getHitSpan: function (hit) {
              return this.getCellRange(hit.row, hit.col);
          },
  
  
          getHitEl: function (hit) {
              return this.getCellEl(hit.row, hit.col);
          },
  
  
          /* Cell System
  	------------------------------------------------------------------------------------------------------------------*/
          // FYI: the first column is the leftmost column, regardless of date
  
  
          getCellHit: function (row, col) {
              return {
                  row: row,
                  col: col,
                  component: this, // needed unfortunately :(
                  left: this.colCoordCache.getLeftOffset(col),
                  right: this.colCoordCache.getRightOffset(col),
                  top: this.rowCoordCache.getTopOffset(row),
                  bottom: this.rowCoordCache.getBottomOffset(row)
              };
          },
  
  
          getCellEl: function (row, col) {
              return this.cellEls.eq(row * this.colCnt + col);
          },
  
  
          /* Event Drag Visualization
  	------------------------------------------------------------------------------------------------------------------*/
          // TODO: move to DayGrid.event, similar to what we did with Grid's drag methods
  
  
          // Renders a visual indication of an event or external element being dragged.
          // `eventLocation` has zoned start and end (optional)
          renderDrag: function (eventLocation, seg) {
  
              // always render a highlight underneath
              this.renderHighlight(this.eventToSpan(eventLocation));
  
              // if a segment from the same calendar but another component is being dragged, render a helper event
              if (seg && seg.component !== this) {
                  return this.renderEventLocationHelper(eventLocation, seg); // returns mock event elements
              }
          },
  
  
          // Unrenders any visual indication of a hovering event
          unrenderDrag: function () {
              this.unrenderHighlight();
              this.unrenderHelper();
          },
  
  
          /* Event Resize Visualization
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a visual indication of an event being resized
          renderEventResize: function (eventLocation, seg) {
              this.renderHighlight(this.eventToSpan(eventLocation));
              return this.renderEventLocationHelper(eventLocation, seg); // returns mock event elements
          },
  
  
          // Unrenders a visual indication of an event being resized
          unrenderEventResize: function () {
              this.unrenderHighlight();
              this.unrenderHelper();
          },
  
  
          /* Event Helper
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a mock "helper" event. `sourceSeg` is the associated internal segment object. It can be null.
          renderHelper: function (event, sourceSeg) {
              var helperNodes = [];
              var segs = this.eventToSegs(event);
              var rowStructs;
  
              segs = this.renderFgSegEls(segs); // assigns each seg's el and returns a subset of segs that were rendered
              rowStructs = this.renderSegRows(segs);
  
              // inject each new event skeleton into each associated row
              this.rowEls.each(function (row, rowNode) {
                  var rowEl = $(rowNode); // the .fc-row
                  var skeletonEl = $('<div class="fc-helper-skeleton"><table/></div>'); // will be absolutely positioned
                  var skeletonTop;
  
                  // If there is an original segment, match the top position. Otherwise, put it at the row's top level
                  if (sourceSeg && sourceSeg.row === row) {
                      skeletonTop = sourceSeg.el.position().top;
                  }
                  else {
                      skeletonTop = rowEl.find('.fc-content-skeleton tbody').position().top;
                  }
  
                  skeletonEl.css('top', skeletonTop)
                      .find('table')
                      .append(rowStructs[row].tbodyEl);
  
                  rowEl.append(skeletonEl);
                  helperNodes.push(skeletonEl[0]);
              });
  
              return ( // must return the elements rendered
                  this.helperEls = $(helperNodes) // array -> jQuery set
              );
          },
  
  
          // Unrenders any visual indication of a mock helper event
          unrenderHelper: function () {
              if (this.helperEls) {
                  this.helperEls.remove();
                  this.helperEls = null;
              }
          },
  
  
          /* Fill System (highlight, background events, business hours)
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          fillSegTag: 'td', // override the default tag name
  
  
          // Renders a set of rectangles over the given segments of days.
          // Only returns segments that successfully rendered.
          renderFill: function (type, segs, className) {
              var nodes = [];
              var i, seg;
              var skeletonEl;
  
              segs = this.renderFillSegEls(type, segs); // assignes `.el` to each seg. returns successfully rendered segs
  
              for (i = 0; i < segs.length; i++) {
                  seg = segs[i];
                  skeletonEl = this.renderFillRow(type, seg, className);
                  this.rowEls.eq(seg.row).append(skeletonEl);
                  nodes.push(skeletonEl[0]);
              }
  
              this.elsByFill[type] = $(nodes);
  
              return segs;
          },
  
  
          // Generates the HTML needed for one row of a fill. Requires the seg's el to be rendered.
          renderFillRow: function (type, seg, className) {
              var colCnt = this.colCnt;
              var startCol = seg.leftCol;
              var endCol = seg.rightCol + 1;
              var skeletonEl;
              var trEl;
  
              className = className || type.toLowerCase();
  
              skeletonEl = $(
                  '<div class="fc-' + className + '-skeleton">' +
                  '<table><tr/></table>' +
                  '</div>'
              );
              trEl = skeletonEl.find('tr');
  
              if (startCol > 0) {
                  trEl.append('<td colspan="' + startCol + '"/>');
              }
  
              trEl.append(
                  seg.el.attr('colspan', endCol - startCol)
              );
  
              if (endCol < colCnt) {
                  trEl.append('<td colspan="' + (colCnt - endCol) + '"/>');
              }
  
              this.bookendCells(trEl);
  
              return skeletonEl;
          }
  
      });
  
      ;
      ;
  
      /* Event-rendering methods for the DayGrid class
  ----------------------------------------------------------------------------------------------------------------------*/
  
      DayGrid.mixin({
  
          rowStructs: null, // an array of objects, each holding information about a row's foreground event-rendering
  
  
          // Unrenders all events currently rendered on the grid
          unrenderEvents: function () {
              this.removeSegPopover(); // removes the "more.." events popover
              Grid.prototype.unrenderEvents.apply(this, arguments); // calls the super-method
          },
  
  
          // Retrieves all rendered segment objects currently rendered on the grid
          getEventSegs: function () {
              return Grid.prototype.getEventSegs.call(this) // get the segments from the super-method
                  .concat(this.popoverSegs || []); // append the segments from the "more..." popover
          },
  
  
          // Renders the given background event segments onto the grid
          renderBgSegs: function (segs) {
  
              // don't render timed background events
              var allDaySegs = $.grep(segs, function (seg) {
                  return seg.event.allDay;
              });
  
              return Grid.prototype.renderBgSegs.call(this, allDaySegs); // call the super-method
          },
  
  
          // Renders the given foreground event segments onto the grid
          renderFgSegs: function (segs) {
              var rowStructs;
  
              // render an `.el` on each seg
              // returns a subset of the segs. segs that were actually rendered
              segs = this.renderFgSegEls(segs);
  
              rowStructs = this.rowStructs = this.renderSegRows(segs);
  
              // append to each row's content skeleton
              this.rowEls.each(function (i, rowNode) {
                  $(rowNode).find('.fc-content-skeleton > table').append(
                      rowStructs[i].tbodyEl
                  );
              });
  
              return segs; // return only the segs that were actually rendered
          },
  
  
          // Unrenders all currently rendered foreground event segments
          unrenderFgSegs: function () {
              var rowStructs = this.rowStructs || [];
              var rowStruct;
  
              while ((rowStruct = rowStructs.pop())) {
                  rowStruct.tbodyEl.remove();
              }
  
              this.rowStructs = null;
          },
  
  
          // Uses the given events array to generate <tbody> elements that should be appended to each row's content skeleton.
          // Returns an array of rowStruct objects (see the bottom of `renderSegRow`).
          // PRECONDITION: each segment shoud already have a rendered and assigned `.el`
          renderSegRows: function (segs) {
              var rowStructs = [];
              var segRows;
              var row;
  
              segRows = this.groupSegRows(segs); // group into nested arrays
  
              // iterate each row of segment groupings
              for (row = 0; row < segRows.length; row++) {
                  rowStructs.push(
                      this.renderSegRow(row, segRows[row])
                  );
              }
  
              return rowStructs;
          },
  
  
          // Builds the HTML to be used for the default element for an individual segment
          fgSegHtml: function (seg, disableResizing) {
              var view = this.view;
              var event = seg.event;
              var isDraggable = view.isEventDraggable(event);
              var isResizableFromStart = !disableResizing && event.allDay &&
                  seg.isStart && view.isEventResizableFromStart(event);
              var isResizableFromEnd = !disableResizing && event.allDay &&
                  seg.isEnd && view.isEventResizableFromEnd(event);
              var classes = this.getSegClasses(seg, isDraggable, isResizableFromStart || isResizableFromEnd);
              var skinCss = cssToStr(this.getSegSkinCss(seg));
              var timeHtml = '';
              var timeText;
              var titleHtml;
  
              classes.unshift('fc-day-grid-event', 'fc-h-event');
  
              // Only display a timed events time if it is the starting segment
              if (seg.isStart) {
                  timeText = this.getEventTimeText(event);
                  if (timeText) {
                      timeHtml = '<span class="fc-time">' + htmlEscape(timeText) + '</span>';
                  }
              }
  
              titleHtml =
                  '<span class="fc-title">' +
                  (htmlEscape(event.title || '') || '&nbsp;') + // we always want one line of height
                  '</span>';
  
              return '<a class="' + classes.join(' ') + '"' +
                  (event.url ?
                          ' href="' + htmlEscape(event.url) + '"' :
                          ''
                  ) +
                  (skinCss ?
                          ' style="' + skinCss + '"' :
                          ''
                  ) +
                  '>' +
                  '<div class="fc-content">' +
                  (this.isRTL ?
                          titleHtml + ' ' + timeHtml : // put a natural space in between
                          timeHtml + ' ' + titleHtml   //
                  ) +
                  '</div>' +
                  (isResizableFromStart ?
                          '<div class="fc-resizer fc-start-resizer" />' :
                          ''
                  ) +
                  (isResizableFromEnd ?
                          '<div class="fc-resizer fc-end-resizer" />' :
                          ''
                  ) +
                  '</a>';
          },
  
  
          // Given a row # and an array of segments all in the same row, render a <tbody> element, a skeleton that contains
          // the segments. Returns object with a bunch of internal data about how the render was calculated.
          // NOTE: modifies rowSegs
          renderSegRow: function (row, rowSegs) {
              var colCnt = this.colCnt;
              var segLevels = this.buildSegLevels(rowSegs); // group into sub-arrays of levels
              var levelCnt = Math.max(1, segLevels.length); // ensure at least one level
              var tbody = $('<tbody/>');
              var segMatrix = []; // lookup for which segments are rendered into which level+col cells
              var cellMatrix = []; // lookup for all <td> elements of the level+col matrix
              var loneCellMatrix = []; // lookup for <td> elements that only take up a single column
              var i, levelSegs;
              var col;
              var tr;
              var j, seg;
              var td;
  
              // populates empty cells from the current column (`col`) to `endCol`
              function emptyCellsUntil(endCol) {
                  while (col < endCol) {
                      // try to grab a cell from the level above and extend its rowspan. otherwise, create a fresh cell
                      td = (loneCellMatrix[i - 1] || [])[col];
                      if (td) {
                          td.attr(
                              'rowspan',
                              parseInt(td.attr('rowspan') || 1, 10) + 1
                          );
                      }
                      else {
                          td = $('<td/>');
                          tr.append(td);
                      }
                      cellMatrix[i][col] = td;
                      loneCellMatrix[i][col] = td;
                      col++;
                  }
              }
  
              for (i = 0; i < levelCnt; i++) { // iterate through all levels
                  levelSegs = segLevels[i];
                  col = 0;
                  tr = $('<tr/>');
  
                  segMatrix.push([]);
                  cellMatrix.push([]);
                  loneCellMatrix.push([]);
  
                  // levelCnt might be 1 even though there are no actual levels. protect against this.
                  // this single empty row is useful for styling.
                  if (levelSegs) {
                      for (j = 0; j < levelSegs.length; j++) { // iterate through segments in level
                          seg = levelSegs[j];
  
                          emptyCellsUntil(seg.leftCol);
  
                          // create a container that occupies or more columns. append the event element.
                          td = $('<td class="fc-event-container"/>').append(seg.el);
                          if (seg.leftCol != seg.rightCol) {
                              td.attr('colspan', seg.rightCol - seg.leftCol + 1);
                          }
                          else { // a single-column segment
                              loneCellMatrix[i][col] = td;
                          }
  
                          while (col <= seg.rightCol) {
                              cellMatrix[i][col] = td;
                              segMatrix[i][col] = seg;
                              col++;
                          }
  
                          tr.append(td);
                      }
                  }
  
                  emptyCellsUntil(colCnt); // finish off the row
                  this.bookendCells(tr);
                  tbody.append(tr);
              }
  
              return { // a "rowStruct"
                  row: row, // the row number
                  tbodyEl: tbody,
                  cellMatrix: cellMatrix,
                  segMatrix: segMatrix,
                  segLevels: segLevels,
                  segs: rowSegs
              };
          },
  
  
          // Stacks a flat array of segments, which are all assumed to be in the same row, into subarrays of vertical levels.
          // NOTE: modifies segs
          buildSegLevels: function (segs) {
              var levels = [];
              var i, seg;
              var j;
  
              // Give preference to elements with certain criteria, so they have
              // a chance to be closer to the top.
              this.sortEventSegs(segs);
  
              for (i = 0; i < segs.length; i++) {
                  seg = segs[i];
  
                  // loop through levels, starting with the topmost, until the segment doesn't collide with other segments
                  for (j = 0; j < levels.length; j++) {
                      if (!isDaySegCollision(seg, levels[j])) {
                          break;
                      }
                  }
                  // `j` now holds the desired subrow index
                  seg.level = j;
  
                  // create new level array if needed and append segment
                  (levels[j] || (levels[j] = [])).push(seg);
              }
  
              // order segments left-to-right. very important if calendar is RTL
              for (j = 0; j < levels.length; j++) {
                  levels[j].sort(compareDaySegCols);
              }
  
              return levels;
          },
  
  
          // Given a flat array of segments, return an array of sub-arrays, grouped by each segment's row
          groupSegRows: function (segs) {
              var segRows = [];
              var i;
  
              for (i = 0; i < this.rowCnt; i++) {
                  segRows.push([]);
              }
  
              for (i = 0; i < segs.length; i++) {
                  segRows[segs[i].row].push(segs[i]);
              }
  
              return segRows;
          }
  
      });
  
  
  // Computes whether two segments' columns collide. They are assumed to be in the same row.
      function isDaySegCollision(seg, otherSegs) {
          var i, otherSeg;
  
          for (i = 0; i < otherSegs.length; i++) {
              otherSeg = otherSegs[i];
  
              if (
                  otherSeg.leftCol <= seg.rightCol &&
                  otherSeg.rightCol >= seg.leftCol
              ) {
                  return true;
              }
          }
  
          return false;
      }
  
  
  // A cmp function for determining the leftmost event
      function compareDaySegCols(a, b) {
          return a.leftCol - b.leftCol;
      }
  
      ;
      ;
  
      /* Methods relate to limiting the number events for a given day on a DayGrid
  ----------------------------------------------------------------------------------------------------------------------*/
  // NOTE: all the segs being passed around in here are foreground segs
  
      DayGrid.mixin({
  
          segPopover: null, // the Popover that holds events that can't fit in a cell. null when not visible
          popoverSegs: null, // an array of segment objects that the segPopover holds. null when not visible
  
  
          removeSegPopover: function () {
              if (this.segPopover) {
                  this.segPopover.hide(); // in handler, will call segPopover's removeElement
              }
          },
  
  
          // Limits the number of "levels" (vertically stacking layers of events) for each row of the grid.
          // `levelLimit` can be false (don't limit), a number, or true (should be computed).
          limitRows: function (levelLimit) {
              var rowStructs = this.rowStructs || [];
              var row; // row #
              var rowLevelLimit;
  
              for (row = 0; row < rowStructs.length; row++) {
                  this.unlimitRow(row);
  
                  if (!levelLimit) {
                      rowLevelLimit = false;
                  }
                  else if (typeof levelLimit === 'number') {
                      rowLevelLimit = levelLimit;
                  }
                  else {
                      rowLevelLimit = this.computeRowLevelLimit(row);
                  }
  
                  if (rowLevelLimit !== false) {
                      this.limitRow(row, rowLevelLimit);
                  }
              }
          },
  
  
          // Computes the number of levels a row will accomodate without going outside its bounds.
          // Assumes the row is "rigid" (maintains a constant height regardless of what is inside).
          // `row` is the row number.
          computeRowLevelLimit: function (row) {
              var rowEl = this.rowEls.eq(row); // the containing "fake" row div
              var rowHeight = rowEl.height(); // TODO: cache somehow?
              var trEls = this.rowStructs[row].tbodyEl.children();
              var i, trEl;
              var trHeight;
  
              function iterInnerHeights(i, childNode) {
                  trHeight = Math.max(trHeight, $(childNode).outerHeight());
              }
  
              // Reveal one level <tr> at a time and stop when we find one out of bounds
              for (i = 0; i < trEls.length; i++) {
                  trEl = trEls.eq(i).removeClass('fc-limited'); // reset to original state (reveal)
  
                  // with rowspans>1 and IE8, trEl.outerHeight() would return the height of the largest cell,
                  // so instead, find the tallest inner content element.
                  trHeight = 0;
                  trEl.find('> td > :first-child').each(iterInnerHeights);
  
                  if (trEl.position().top + trHeight > rowHeight) {
                      return i;
                  }
              }
  
              return false; // should not limit at all
          },
  
  
          // Limits the given grid row to the maximum number of levels and injects "more" links if necessary.
          // `row` is the row number.
          // `levelLimit` is a number for the maximum (inclusive) number of levels allowed.
          limitRow: function (row, levelLimit) {
              var _this = this;
              var rowStruct = this.rowStructs[row];
              var moreNodes = []; // array of "more" <a> links and <td> DOM nodes
              var col = 0; // col #, left-to-right (not chronologically)
              var levelSegs; // array of segment objects in the last allowable level, ordered left-to-right
              var cellMatrix; // a matrix (by level, then column) of all <td> jQuery elements in the row
              var limitedNodes; // array of temporarily hidden level <tr> and segment <td> DOM nodes
              var i, seg;
              var segsBelow; // array of segment objects below `seg` in the current `col`
              var totalSegsBelow; // total number of segments below `seg` in any of the columns `seg` occupies
              var colSegsBelow; // array of segment arrays, below seg, one for each column (offset from segs's first column)
              var td, rowspan;
              var segMoreNodes; // array of "more" <td> cells that will stand-in for the current seg's cell
              var j;
              var moreTd, moreWrap, moreLink;
  
              // Iterates through empty level cells and places "more" links inside if need be
              function emptyCellsUntil(endCol) { // goes from current `col` to `endCol`
                  while (col < endCol) {
                      segsBelow = _this.getCellSegs(row, col, levelLimit);
                      if (segsBelow.length) {
                          td = cellMatrix[levelLimit - 1][col];
                          moreLink = _this.renderMoreLink(row, col, segsBelow);
                          moreWrap = $('<div/>').append(moreLink);
                          td.append(moreWrap);
                          moreNodes.push(moreWrap[0]);
                      }
                      col++;
                  }
              }
  
              if (levelLimit && levelLimit < rowStruct.segLevels.length) { // is it actually over the limit?
                  levelSegs = rowStruct.segLevels[levelLimit - 1];
                  cellMatrix = rowStruct.cellMatrix;
  
                  limitedNodes = rowStruct.tbodyEl.children().slice(levelLimit) // get level <tr> elements past the limit
                      .addClass('fc-limited').get(); // hide elements and get a simple DOM-nodes array
  
                  // iterate though segments in the last allowable level
                  for (i = 0; i < levelSegs.length; i++) {
                      seg = levelSegs[i];
                      emptyCellsUntil(seg.leftCol); // process empty cells before the segment
  
                      // determine *all* segments below `seg` that occupy the same columns
                      colSegsBelow = [];
                      totalSegsBelow = 0;
                      while (col <= seg.rightCol) {
                          segsBelow = this.getCellSegs(row, col, levelLimit);
                          colSegsBelow.push(segsBelow);
                          totalSegsBelow += segsBelow.length;
                          col++;
                      }
  
                      if (totalSegsBelow) { // do we need to replace this segment with one or many "more" links?
                          td = cellMatrix[levelLimit - 1][seg.leftCol]; // the segment's parent cell
                          rowspan = td.attr('rowspan') || 1;
                          segMoreNodes = [];
  
                          // make a replacement <td> for each column the segment occupies. will be one for each colspan
                          for (j = 0; j < colSegsBelow.length; j++) {
                              moreTd = $('<td class="fc-more-cell"/>').attr('rowspan', rowspan);
                              segsBelow = colSegsBelow[j];
                              moreLink = this.renderMoreLink(
                                  row,
                                  seg.leftCol + j,
                                  [seg].concat(segsBelow) // count seg as hidden too
                              );
                              moreWrap = $('<div/>').append(moreLink);
                              moreTd.append(moreWrap);
                              segMoreNodes.push(moreTd[0]);
                              moreNodes.push(moreTd[0]);
                          }
  
                          td.addClass('fc-limited').after($(segMoreNodes)); // hide original <td> and inject replacements
                          limitedNodes.push(td[0]);
                      }
                  }
  
                  emptyCellsUntil(this.colCnt); // finish off the level
                  rowStruct.moreEls = $(moreNodes); // for easy undoing later
                  rowStruct.limitedEls = $(limitedNodes); // for easy undoing later
              }
          },
  
  
          // Reveals all levels and removes all "more"-related elements for a grid's row.
          // `row` is a row number.
          unlimitRow: function (row) {
              var rowStruct = this.rowStructs[row];
  
              if (rowStruct.moreEls) {
                  rowStruct.moreEls.remove();
                  rowStruct.moreEls = null;
              }
  
              if (rowStruct.limitedEls) {
                  rowStruct.limitedEls.removeClass('fc-limited');
                  rowStruct.limitedEls = null;
              }
          },
  
  
          // Renders an <a> element that represents hidden event element for a cell.
          // Responsible for attaching click handler as well.
          renderMoreLink: function (row, col, hiddenSegs) {
              var _this = this;
              var view = this.view;
  
              return $('<a class="fc-more"/>')
                  .text(
                      this.getMoreLinkText(hiddenSegs.length)
                  )
                  .on('click', function (ev) {
                      var clickOption = view.opt('eventLimitClick');
                      var date = _this.getCellDate(row, col);
                      var moreEl = $(this);
                      var dayEl = _this.getCellEl(row, col);
                      var allSegs = _this.getCellSegs(row, col);
  
                      // rescope the segments to be within the cell's date
                      var reslicedAllSegs = _this.resliceDaySegs(allSegs, date);
                      var reslicedHiddenSegs = _this.resliceDaySegs(hiddenSegs, date);
  
                      if (typeof clickOption === 'function') {
                          // the returned value can be an atomic option
                          clickOption = view.publiclyTrigger('eventLimitClick', null, {
                              date: date,
                              dayEl: dayEl,
                              moreEl: moreEl,
                              segs: reslicedAllSegs,
                              hiddenSegs: reslicedHiddenSegs
                          }, ev);
                      }
  
                      if (clickOption === 'popover') {
                          _this.showSegPopover(row, col, moreEl, reslicedAllSegs);
                      }
                      else if (typeof clickOption === 'string') { // a view name
                          view.calendar.zoomTo(date, clickOption);
                      }
                  });
          },
  
  
          // Reveals the popover that displays all events within a cell
          showSegPopover: function (row, col, moreLink, segs) {
              var _this = this;
              var view = this.view;
              var moreWrap = moreLink.parent(); // the <div> wrapper around the <a>
              var topEl; // the element we want to match the top coordinate of
              var options;
  
              if (this.rowCnt == 1) {
                  topEl = view.el; // will cause the popover to cover any sort of header
              }
              else {
                  topEl = this.rowEls.eq(row); // will align with top of row
              }
  
              options = {
                  className: 'fc-more-popover',
                  content: this.renderSegPopoverContent(row, col, segs),
                  parentEl: this.view.el, // attach to root of view. guarantees outside of scrollbars.
                  top: topEl.offset().top,
                  autoHide: true, // when the user clicks elsewhere, hide the popover
                  viewportConstrain: view.opt('popoverViewportConstrain'),
                  hide: function () {
                      // kill everything when the popover is hidden
                      // notify events to be removed
                      if (_this.popoverSegs) {
                          var seg;
                          for (var i = 0; i < _this.popoverSegs.length; ++i) {
                              seg = _this.popoverSegs[i];
                              view.publiclyTrigger('eventDestroy', seg.event, seg.event, seg.el);
                          }
                      }
                      _this.segPopover.removeElement();
                      _this.segPopover = null;
                      _this.popoverSegs = null;
                  }
              };
  
              // Determine horizontal coordinate.
              // We use the moreWrap instead of the <td> to avoid border confusion.
              if (this.isRTL) {
                  options.right = moreWrap.offset().left + moreWrap.outerWidth() + 1; // +1 to be over cell border
              }
              else {
                  options.left = moreWrap.offset().left - 1; // -1 to be over cell border
              }
  
              this.segPopover = new Popover(options);
              this.segPopover.show();
  
              // the popover doesn't live within the grid's container element, and thus won't get the event
              // delegated-handlers for free. attach event-related handlers to the popover.
              this.bindSegHandlersToEl(this.segPopover.el);
          },
  
  
          // Builds the inner DOM contents of the segment popover
          renderSegPopoverContent: function (row, col, segs) {
              var view = this.view;
              var isTheme = view.opt('theme');
              var title = this.getCellDate(row, col).format(view.opt('dayPopoverFormat'));
              var content = $(
                  '<div class="fc-header ' + view.widgetHeaderClass + '">' +
                  '<span class="fc-close ' +
                  (isTheme ? 'ui-icon ui-icon-closethick' : 'fc-icon fc-icon-x') +
                  '"></span>' +
                  '<span class="fc-title">' +
                  htmlEscape(title) +
                  '</span>' +
                  '<div class="fc-clear"/>' +
                  '</div>' +
                  '<div class="fc-body ' + view.widgetContentClass + '">' +
                  '<div class="fc-event-container"></div>' +
                  '</div>'
              );
              var segContainer = content.find('.fc-event-container');
              var i;
  
              // render each seg's `el` and only return the visible segs
              segs = this.renderFgSegEls(segs, true); // disableResizing=true
              this.popoverSegs = segs;
  
              for (i = 0; i < segs.length; i++) {
  
                  // because segments in the popover are not part of a grid coordinate system, provide a hint to any
                  // grids that want to do drag-n-drop about which cell it came from
                  this.hitsNeeded();
                  segs[i].hit = this.getCellHit(row, col);
                  this.hitsNotNeeded();
  
                  segContainer.append(segs[i].el);
              }
  
              return content;
          },
  
  
          // Given the events within an array of segment objects, reslice them to be in a single day
          resliceDaySegs: function (segs, dayDate) {
  
              // build an array of the original events
              var events = $.map(segs, function (seg) {
                  return seg.event;
              });
  
              var dayStart = dayDate.clone();
              var dayEnd = dayStart.clone().add(1, 'days');
              var dayRange = {start: dayStart, end: dayEnd};
  
              // slice the events with a custom slicing function
              segs = this.eventsToSegs(
                  events,
                  function (range) {
                      var seg = intersectRanges(range, dayRange); // undefind if no intersection
                      return seg ? [seg] : []; // must return an array of segments
                  }
              );
  
              // force an order because eventsToSegs doesn't guarantee one
              this.sortEventSegs(segs);
  
              return segs;
          },
  
  
          // Generates the text that should be inside a "more" link, given the number of events it represents
          getMoreLinkText: function (num) {
              var opt = this.view.opt('eventLimitText');
  
              if (typeof opt === 'function') {
                  return opt(num);
              }
              else {
                  return '+' + num + ' ' + opt;
              }
          },
  
  
          // Returns segments within a given cell.
          // If `startLevel` is specified, returns only events including and below that level. Otherwise returns all segs.
          getCellSegs: function (row, col, startLevel) {
              var segMatrix = this.rowStructs[row].segMatrix;
              var level = startLevel || 0;
              var segs = [];
              var seg;
  
              while (level < segMatrix.length) {
                  seg = segMatrix[level][col];
                  if (seg) {
                      segs.push(seg);
                  }
                  level++;
              }
  
              return segs;
          }
  
      });
  
      ;
      ;
  
      /* A component that renders one or more columns of vertical time slots
  ----------------------------------------------------------------------------------------------------------------------*/
  // We mixin DayTable, even though there is only a single row of days
  
      var TimeGrid = FC.TimeGrid = Grid.extend(DayTableMixin, {
  
          slotDuration: null, // duration of a "slot", a distinct time segment on given day, visualized by lines
          snapDuration: null, // granularity of time for dragging and selecting
          snapsPerSlot: null,
          minTime: null, // Duration object that denotes the first visible time of any given day
          maxTime: null, // Duration object that denotes the exclusive visible end time of any given day
          labelFormat: null, // formatting string for times running along vertical axis
          labelInterval: null, // duration of how often a label should be displayed for a slot
  
          colEls: null, // cells elements in the day-row background
          slatContainerEl: null, // div that wraps all the slat rows
          slatEls: null, // elements running horizontally across all columns
          nowIndicatorEls: null,
  
          colCoordCache: null,
          slatCoordCache: null,
  
  
          constructor: function () {
              Grid.apply(this, arguments); // call the super-constructor
  
              this.processOptions();
          },
  
  
          // Renders the time grid into `this.el`, which should already be assigned.
          // Relies on the view's colCnt. In the future, this component should probably be self-sufficient.
          renderDates: function () {
              this.el.html(this.renderHtml());
              this.colEls = this.el.find('.fc-day');
              this.slatContainerEl = this.el.find('.fc-slats');
              this.slatEls = this.slatContainerEl.find('tr');
  
              this.colCoordCache = new CoordCache({
                  els: this.colEls,
                  isHorizontal: true
              });
              this.slatCoordCache = new CoordCache({
                  els: this.slatEls,
                  isVertical: true
              });
  
              this.renderContentSkeleton();
          },
  
  
          // Renders the basic HTML skeleton for the grid
          renderHtml: function () {
              return '' +
                  '<div class="fc-bg">' +
                  '<table>' +
                  this.renderBgTrHtml(0) + // row=0
                  '</table>' +
                  '</div>' +
                  '<div class="fc-slats">' +
                  '<table>' +
                  this.renderSlatRowHtml() +
                  '</table>' +
                  '</div>';
          },
  
  
          // Generates the HTML for the horizontal "slats" that run width-wise. Has a time axis on a side. Depends on RTL.
          renderSlatRowHtml: function () {
              var view = this.view;
              var isRTL = this.isRTL;
              var html = '';
              var slotTime = moment.duration(+this.minTime); // wish there was .clone() for durations
              var slotDate; // will be on the view's first day, but we only care about its time
              var isLabeled;
              var axisHtml;
  
              // Calculate the time for each slot
              while (slotTime < this.maxTime) {
                  slotDate = this.start.clone().time(slotTime);
                  isLabeled = isInt(divideDurationByDuration(slotTime, this.labelInterval));
  
                  axisHtml =
                      '<td class="fc-axis fc-time ' + view.widgetContentClass + '" ' + view.axisStyleAttr() + '>' +
                      (isLabeled ?
                              '<span>' + // for matchCellWidths
                              htmlEscape(slotDate.format(this.labelFormat)) +
                              '</span>' :
                              ''
                      ) +
                      '</td>';
  
                  html +=
                      '<tr data-time="' + slotDate.format('HH:mm:ss') + '"' +
                      (isLabeled ? '' : ' class="fc-minor"') +
                      '>' +
                      (!isRTL ? axisHtml : '') +
                      '<td class="' + view.widgetContentClass + '"/>' +
                      (isRTL ? axisHtml : '') +
                      "</tr>";
  
                  slotTime.add(this.slotDuration);
              }
  
              return html;
          },
  
  
          /* Options
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Parses various options into properties of this object
          processOptions: function () {
              var view = this.view;
              var slotDuration = view.opt('slotDuration');
              var snapDuration = view.opt('snapDuration');
              var input;
  
              slotDuration = moment.duration(slotDuration);
              snapDuration = snapDuration ? moment.duration(snapDuration) : slotDuration;
  
              this.slotDuration = slotDuration;
              this.snapDuration = snapDuration;
              this.snapsPerSlot = slotDuration / snapDuration; // TODO: ensure an integer multiple?
  
              this.minResizeDuration = snapDuration; // hack
  
              this.minTime = moment.duration(view.opt('minTime'));
              this.maxTime = moment.duration(view.opt('maxTime'));
  
              // might be an array value (for TimelineView).
              // if so, getting the most granular entry (the last one probably).
              input = view.opt('slotLabelFormat');
              if ($.isArray(input)) {
                  input = input[input.length - 1];
              }
  
              this.labelFormat =
                  input ||
                  view.opt('smallTimeFormat'); // the computed default
  
              input = view.opt('slotLabelInterval');
              this.labelInterval = input ?
                  moment.duration(input) :
                  this.computeLabelInterval(slotDuration);
          },
  
  
          // Computes an automatic value for slotLabelInterval
          computeLabelInterval: function (slotDuration) {
              var i;
              var labelInterval;
              var slotsPerLabel;
  
              // find the smallest stock label interval that results in more than one slots-per-label
              for (i = AGENDA_STOCK_SUB_DURATIONS.length - 1; i >= 0; i--) {
                  labelInterval = moment.duration(AGENDA_STOCK_SUB_DURATIONS[i]);
                  slotsPerLabel = divideDurationByDuration(labelInterval, slotDuration);
                  if (isInt(slotsPerLabel) && slotsPerLabel > 1) {
                      return labelInterval;
                  }
              }
  
              return moment.duration(slotDuration); // fall back. clone
          },
  
  
          // Computes a default event time formatting string if `timeFormat` is not explicitly defined
          computeEventTimeFormat: function () {
              return this.view.opt('noMeridiemTimeFormat'); // like "6:30" (no AM/PM)
          },
  
  
          // Computes a default `displayEventEnd` value if one is not expliclty defined
          computeDisplayEventEnd: function () {
              return true;
          },
  
  
          /* Hit System
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          prepareHits: function () {
              this.colCoordCache.build();
              this.slatCoordCache.build();
          },
  
  
          releaseHits: function () {
              this.colCoordCache.clear();
              // NOTE: don't clear slatCoordCache because we rely on it for computeTimeTop
          },
  
  
          queryHit: function (leftOffset, topOffset) {
              var snapsPerSlot = this.snapsPerSlot;
              var colCoordCache = this.colCoordCache;
              var slatCoordCache = this.slatCoordCache;
  
              if (colCoordCache.isLeftInBounds(leftOffset) && slatCoordCache.isTopInBounds(topOffset)) {
                  var colIndex = colCoordCache.getHorizontalIndex(leftOffset);
                  var slatIndex = slatCoordCache.getVerticalIndex(topOffset);
  
                  if (colIndex != null && slatIndex != null) {
                      var slatTop = slatCoordCache.getTopOffset(slatIndex);
                      var slatHeight = slatCoordCache.getHeight(slatIndex);
                      var partial = (topOffset - slatTop) / slatHeight; // floating point number between 0 and 1
                      var localSnapIndex = Math.floor(partial * snapsPerSlot); // the snap # relative to start of slat
                      var snapIndex = slatIndex * snapsPerSlot + localSnapIndex;
                      var snapTop = slatTop + (localSnapIndex / snapsPerSlot) * slatHeight;
                      var snapBottom = slatTop + ((localSnapIndex + 1) / snapsPerSlot) * slatHeight;
  
                      return {
                          col: colIndex,
                          snap: snapIndex,
                          component: this, // needed unfortunately :(
                          left: colCoordCache.getLeftOffset(colIndex),
                          right: colCoordCache.getRightOffset(colIndex),
                          top: snapTop,
                          bottom: snapBottom
                      };
                  }
              }
          },
  
  
          getHitSpan: function (hit) {
              var start = this.getCellDate(0, hit.col); // row=0
              var time = this.computeSnapTime(hit.snap); // pass in the snap-index
              var end;
  
              start.time(time);
              end = start.clone().add(this.snapDuration);
  
              return {start: start, end: end};
          },
  
  
          getHitEl: function (hit) {
              return this.colEls.eq(hit.col);
          },
  
  
          /* Dates
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          rangeUpdated: function () {
              this.updateDayTable();
          },
  
  
          // Given a row number of the grid, representing a "snap", returns a time (Duration) from its start-of-day
          computeSnapTime: function (snapIndex) {
              return moment.duration(this.minTime + this.snapDuration * snapIndex);
          },
  
  
          // Slices up the given span (unzoned start/end with other misc data) into an array of segments
          spanToSegs: function (span) {
              var segs = this.sliceRangeByTimes(span);
              var i;
  
              for (i = 0; i < segs.length; i++) {
                  if (this.isRTL) {
                      segs[i].col = this.daysPerRow - 1 - segs[i].dayIndex;
                  }
                  else {
                      segs[i].col = segs[i].dayIndex;
                  }
              }
  
              return segs;
          },
  
  
          sliceRangeByTimes: function (range) {
              var segs = [];
              var seg;
              var dayIndex;
              var dayDate;
              var dayRange;
  
              for (dayIndex = 0; dayIndex < this.daysPerRow; dayIndex++) {
                  dayDate = this.dayDates[dayIndex].clone(); // TODO: better API for this?
                  dayRange = {
                      start: dayDate.clone().time(this.minTime),
                      end: dayDate.clone().time(this.maxTime)
                  };
                  seg = intersectRanges(range, dayRange); // both will be ambig timezone
                  if (seg) {
                      seg.dayIndex = dayIndex;
                      segs.push(seg);
                  }
              }
  
              return segs;
          },
  
  
          /* Coordinates
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          updateSize: function (isResize) { // NOT a standard Grid method
              this.slatCoordCache.build();
  
              if (isResize) {
                  this.updateSegVerticals(
                      [].concat(this.fgSegs || [], this.bgSegs || [], this.businessSegs || [])
                  );
              }
          },
  
  
          getTotalSlatHeight: function () {
              return this.slatContainerEl.outerHeight();
          },
  
  
          // Computes the top coordinate, relative to the bounds of the grid, of the given date.
          // A `startOfDayDate` must be given for avoiding ambiguity over how to treat midnight.
          computeDateTop: function (date, startOfDayDate) {
              return this.computeTimeTop(
                  moment.duration(
                      date - startOfDayDate.clone().stripTime()
                  )
              );
          },
  
  
          // Computes the top coordinate, relative to the bounds of the grid, of the given time (a Duration).
          computeTimeTop: function (time) {
              var len = this.slatEls.length;
              var slatCoverage = (time - this.minTime) / this.slotDuration; // floating-point value of # of slots covered
              var slatIndex;
              var slatRemainder;
  
              // compute a floating-point number for how many slats should be progressed through.
              // from 0 to number of slats (inclusive)
              // constrained because minTime/maxTime might be customized.
              slatCoverage = Math.max(0, slatCoverage);
              slatCoverage = Math.min(len, slatCoverage);
  
              // an integer index of the furthest whole slat
              // from 0 to number slats (*exclusive*, so len-1)
              slatIndex = Math.floor(slatCoverage);
              slatIndex = Math.min(slatIndex, len - 1);
  
              // how much further through the slatIndex slat (from 0.0-1.0) must be covered in addition.
              // could be 1.0 if slatCoverage is covering *all* the slots
              slatRemainder = slatCoverage - slatIndex;
  
              return this.slatCoordCache.getTopPosition(slatIndex) +
                  this.slatCoordCache.getHeight(slatIndex) * slatRemainder;
          },
  
  
          /* Event Drag Visualization
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a visual indication of an event being dragged over the specified date(s).
          // A returned value of `true` signals that a mock "helper" event has been rendered.
          renderDrag: function (eventLocation, seg) {
  
              if (seg) { // if there is event information for this drag, render a helper event
  
                  // returns mock event elements
                  // signal that a helper has been rendered
                  return this.renderEventLocationHelper(eventLocation, seg);
              }
              else {
                  // otherwise, just render a highlight
                  this.renderHighlight(this.eventToSpan(eventLocation));
              }
          },
  
  
          // Unrenders any visual indication of an event being dragged
          unrenderDrag: function () {
              this.unrenderHelper();
              this.unrenderHighlight();
          },
  
  
          /* Event Resize Visualization
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a visual indication of an event being resized
          renderEventResize: function (eventLocation, seg) {
              return this.renderEventLocationHelper(eventLocation, seg); // returns mock event elements
          },
  
  
          // Unrenders any visual indication of an event being resized
          unrenderEventResize: function () {
              this.unrenderHelper();
          },
  
  
          /* Event Helper
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a mock "helper" event. `sourceSeg` is the original segment object and might be null (an external drag)
          renderHelper: function (event, sourceSeg) {
              return this.renderHelperSegs(this.eventToSegs(event), sourceSeg); // returns mock event elements
          },
  
  
          // Unrenders any mock helper event
          unrenderHelper: function () {
              this.unrenderHelperSegs();
          },
  
  
          /* Business Hours
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderBusinessHours: function () {
              this.renderBusinessSegs(
                  this.buildBusinessHourSegs()
              );
          },
  
  
          unrenderBusinessHours: function () {
              this.unrenderBusinessSegs();
          },
  
  
          /* Now Indicator
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          getNowIndicatorUnit: function () {
              return 'minute'; // will refresh on the minute
          },
  
  
          renderNowIndicator: function (date) {
              // seg system might be overkill, but it handles scenario where line needs to be rendered
              //  more than once because of columns with the same date (resources columns for example)
              var segs = this.spanToSegs({start: date, end: date});
              var top = this.computeDateTop(date, date);
              var nodes = [];
              var i;
  
              // render lines within the columns
              for (i = 0; i < segs.length; i++) {
                  nodes.push($('<div class="fc-now-indicator fc-now-indicator-line"></div>')
                      .css('top', top)
                      .appendTo(this.colContainerEls.eq(segs[i].col))[0]);
              }
  
              // render an arrow over the axis
              if (segs.length > 0) { // is the current time in view?
                  nodes.push($('<div class="fc-now-indicator fc-now-indicator-arrow"></div>')
                      .css('top', top)
                      .appendTo(this.el.find('.fc-content-skeleton'))[0]);
              }
  
              this.nowIndicatorEls = $(nodes);
          },
  
  
          unrenderNowIndicator: function () {
              if (this.nowIndicatorEls) {
                  this.nowIndicatorEls.remove();
                  this.nowIndicatorEls = null;
              }
          },
  
  
          /* Selection
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a visual indication of a selection. Overrides the default, which was to simply render a highlight.
          renderSelection: function (span) {
              if (this.view.opt('selectHelper')) { // this setting signals that a mock helper event should be rendered
  
                  // normally acceps an eventLocation, span has a start/end, which is good enough
                  this.renderEventLocationHelper(span);
              }
              else {
                  this.renderHighlight(span);
              }
          },
  
  
          // Unrenders any visual indication of a selection
          unrenderSelection: function () {
              this.unrenderHelper();
              this.unrenderHighlight();
          },
  
  
          /* Highlight
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderHighlight: function (span) {
              this.renderHighlightSegs(this.spanToSegs(span));
          },
  
  
          unrenderHighlight: function () {
              this.unrenderHighlightSegs();
          }
  
      });
  
      ;
      ;
  
      /* Methods for rendering SEGMENTS, pieces of content that live on the view
   ( this file is no longer just for events )
  ----------------------------------------------------------------------------------------------------------------------*/
  
      TimeGrid.mixin({
  
          colContainerEls: null, // containers for each column
  
          // inner-containers for each column where different types of segs live
          fgContainerEls: null,
          bgContainerEls: null,
          helperContainerEls: null,
          highlightContainerEls: null,
          businessContainerEls: null,
  
          // arrays of different types of displayed segments
          fgSegs: null,
          bgSegs: null,
          helperSegs: null,
          highlightSegs: null,
          businessSegs: null,
  
  
          // Renders the DOM that the view's content will live in
          renderContentSkeleton: function () {
              var cellHtml = '';
              var i;
              var skeletonEl;
  
              for (i = 0; i < this.colCnt; i++) {
                  cellHtml +=
                      '<td>' +
                      '<div class="fc-content-col">' +
                      '<div class="fc-event-container fc-helper-container"></div>' +
                      '<div class="fc-event-container"></div>' +
                      '<div class="fc-highlight-container"></div>' +
                      '<div class="fc-bgevent-container"></div>' +
                      '<div class="fc-business-container"></div>' +
                      '</div>' +
                      '</td>';
              }
  
              skeletonEl = $(
                  '<div class="fc-content-skeleton">' +
                  '<table>' +
                  '<tr>' + cellHtml + '</tr>' +
                  '</table>' +
                  '</div>'
              );
  
              this.colContainerEls = skeletonEl.find('.fc-content-col');
              this.helperContainerEls = skeletonEl.find('.fc-helper-container');
              this.fgContainerEls = skeletonEl.find('.fc-event-container:not(.fc-helper-container)');
              this.bgContainerEls = skeletonEl.find('.fc-bgevent-container');
              this.highlightContainerEls = skeletonEl.find('.fc-highlight-container');
              this.businessContainerEls = skeletonEl.find('.fc-business-container');
  
              this.bookendCells(skeletonEl.find('tr')); // TODO: do this on string level
              this.el.append(skeletonEl);
          },
  
  
          /* Foreground Events
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderFgSegs: function (segs) {
              segs = this.renderFgSegsIntoContainers(segs, this.fgContainerEls);
              this.fgSegs = segs;
              return segs; // needed for Grid::renderEvents
          },
  
  
          unrenderFgSegs: function () {
              this.unrenderNamedSegs('fgSegs');
          },
  
  
          /* Foreground Helper Events
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderHelperSegs: function (segs, sourceSeg) {
              var helperEls = [];
              var i, seg;
              var sourceEl;
  
              segs = this.renderFgSegsIntoContainers(segs, this.helperContainerEls);
  
              // Try to make the segment that is in the same row as sourceSeg look the same
              for (i = 0; i < segs.length; i++) {
                  seg = segs[i];
                  if (sourceSeg && sourceSeg.col === seg.col) {
                      sourceEl = sourceSeg.el;
                      seg.el.css({
                          left: sourceEl.css('left'),
                          right: sourceEl.css('right'),
                          'margin-left': sourceEl.css('margin-left'),
                          'margin-right': sourceEl.css('margin-right')
                      });
                  }
                  helperEls.push(seg.el[0]);
              }
  
              this.helperSegs = segs;
  
              return $(helperEls); // must return rendered helpers
          },
  
  
          unrenderHelperSegs: function () {
              this.unrenderNamedSegs('helperSegs');
          },
  
  
          /* Background Events
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderBgSegs: function (segs) {
              segs = this.renderFillSegEls('bgEvent', segs); // TODO: old fill system
              this.updateSegVerticals(segs);
              this.attachSegsByCol(this.groupSegsByCol(segs), this.bgContainerEls);
              this.bgSegs = segs;
              return segs; // needed for Grid::renderEvents
          },
  
  
          unrenderBgSegs: function () {
              this.unrenderNamedSegs('bgSegs');
          },
  
  
          /* Highlight
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderHighlightSegs: function (segs) {
              segs = this.renderFillSegEls('highlight', segs); // TODO: old fill system
              this.updateSegVerticals(segs);
              this.attachSegsByCol(this.groupSegsByCol(segs), this.highlightContainerEls);
              this.highlightSegs = segs;
          },
  
  
          unrenderHighlightSegs: function () {
              this.unrenderNamedSegs('highlightSegs');
          },
  
  
          /* Business Hours
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderBusinessSegs: function (segs) {
              segs = this.renderFillSegEls('businessHours', segs); // TODO: old fill system
              this.updateSegVerticals(segs);
              this.attachSegsByCol(this.groupSegsByCol(segs), this.businessContainerEls);
              this.businessSegs = segs;
          },
  
  
          unrenderBusinessSegs: function () {
              this.unrenderNamedSegs('businessSegs');
          },
  
  
          /* Seg Rendering Utils
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Given a flat array of segments, return an array of sub-arrays, grouped by each segment's col
          groupSegsByCol: function (segs) {
              var segsByCol = [];
              var i;
  
              for (i = 0; i < this.colCnt; i++) {
                  segsByCol.push([]);
              }
  
              for (i = 0; i < segs.length; i++) {
                  segsByCol[segs[i].col].push(segs[i]);
              }
  
              return segsByCol;
          },
  
  
          // Given segments grouped by column, insert the segments' elements into a parallel array of container
          // elements, each living within a column.
          attachSegsByCol: function (segsByCol, containerEls) {
              var col;
              var segs;
              var i;
  
              for (col = 0; col < this.colCnt; col++) { // iterate each column grouping
                  segs = segsByCol[col];
  
                  for (i = 0; i < segs.length; i++) {
                      containerEls.eq(col).append(segs[i].el);
                  }
              }
          },
  
  
          // Given the name of a property of `this` object, assumed to be an array of segments,
          // loops through each segment and removes from DOM. Will null-out the property afterwards.
          unrenderNamedSegs: function (propName) {
              var segs = this[propName];
              var i;
  
              if (segs) {
                  for (i = 0; i < segs.length; i++) {
                      segs[i].el.remove();
                  }
                  this[propName] = null;
              }
          },
  
  
          /* Foreground Event Rendering Utils
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Given an array of foreground segments, render a DOM element for each, computes position,
          // and attaches to the column inner-container elements.
          renderFgSegsIntoContainers: function (segs, containerEls) {
              var segsByCol;
              var col;
  
              segs = this.renderFgSegEls(segs); // will call fgSegHtml
              segsByCol = this.groupSegsByCol(segs);
  
              for (col = 0; col < this.colCnt; col++) {
                  this.updateFgSegCoords(segsByCol[col]);
              }
  
              this.attachSegsByCol(segsByCol, containerEls);
  
              return segs;
          },
  
  
          // Renders the HTML for a single event segment's default rendering
          fgSegHtml: function (seg, disableResizing) {
              var view = this.view;
              var event = seg.event;
              var isDraggable = view.isEventDraggable(event);
              var isResizableFromStart = !disableResizing && seg.isStart && view.isEventResizableFromStart(event);
              var isResizableFromEnd = !disableResizing && seg.isEnd && view.isEventResizableFromEnd(event);
              var classes = this.getSegClasses(seg, isDraggable, isResizableFromStart || isResizableFromEnd);
              var skinCss = cssToStr(this.getSegSkinCss(seg));
              var timeText;
              var fullTimeText; // more verbose time text. for the print stylesheet
              var startTimeText; // just the start time text
  
              classes.unshift('fc-time-grid-event', 'fc-v-event');
  
              if (view.isMultiDayEvent(event)) { // if the event appears to span more than one day...
                  // Don't display time text on segments that run entirely through a day.
                  // That would appear as midnight-midnight and would look dumb.
                  // Otherwise, display the time text for the *segment's* times (like 6pm-midnight or midnight-10am)
                  if (seg.isStart || seg.isEnd) {
                      timeText = this.getEventTimeText(seg);
                      fullTimeText = this.getEventTimeText(seg, 'LT');
                      startTimeText = this.getEventTimeText(seg, null, false); // displayEnd=false
                  }
              } else {
                  // Display the normal time text for the *event's* times
                  timeText = this.getEventTimeText(event);
                  fullTimeText = this.getEventTimeText(event, 'LT');
                  startTimeText = this.getEventTimeText(event, null, false); // displayEnd=false
              }
  
              return '<a class="' + classes.join(' ') + '"' +
                  (event.url ?
                          ' href="' + htmlEscape(event.url) + '"' :
                          ''
                  ) +
                  (skinCss ?
                          ' style="' + skinCss + '"' :
                          ''
                  ) +
                  '>' +
                  '<div class="fc-content">' +
                  (timeText ?
                          '<div class="fc-time"' +
                          ' data-start="' + htmlEscape(startTimeText) + '"' +
                          ' data-full="' + htmlEscape(fullTimeText) + '"' +
                          '>' +
                          '<span>' + htmlEscape(timeText) + '</span>' +
                          '</div>' :
                          ''
                  ) +
                  (event.title ?
                          '<div class="fc-title">' +
                          htmlEscape(event.title) +
                          '</div>' :
                          ''
                  ) +
                  '</div>' +
                  '<div class="fc-bg"/>' +
                  /* TODO: write CSS for this
  				(isResizableFromStart ?
  					'<div class="fc-resizer fc-start-resizer" />' :
  					''
  					) +
  				*/
                  (isResizableFromEnd ?
                          '<div class="fc-resizer fc-end-resizer" />' :
                          ''
                  ) +
                  '</a>';
          },
  
  
          /* Seg Position Utils
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Refreshes the CSS top/bottom coordinates for each segment element.
          // Works when called after initial render, after a window resize/zoom for example.
          updateSegVerticals: function (segs) {
              this.computeSegVerticals(segs);
              this.assignSegVerticals(segs);
          },
  
  
          // For each segment in an array, computes and assigns its top and bottom properties
          computeSegVerticals: function (segs) {
              var i, seg;
  
              for (i = 0; i < segs.length; i++) {
                  seg = segs[i];
                  seg.top = this.computeDateTop(seg.start, seg.start);
                  seg.bottom = this.computeDateTop(seg.end, seg.start);
              }
          },
  
  
          // Given segments that already have their top/bottom properties computed, applies those values to
          // the segments' elements.
          assignSegVerticals: function (segs) {
              var i, seg;
  
              for (i = 0; i < segs.length; i++) {
                  seg = segs[i];
                  seg.el.css(this.generateSegVerticalCss(seg));
              }
          },
  
  
          // Generates an object with CSS properties for the top/bottom coordinates of a segment element
          generateSegVerticalCss: function (seg) {
              return {
                  top: seg.top,
                  bottom: -seg.bottom // flipped because needs to be space beyond bottom edge of event container
              };
          },
  
  
          /* Foreground Event Positioning Utils
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Given segments that are assumed to all live in the *same column*,
          // compute their verical/horizontal coordinates and assign to their elements.
          updateFgSegCoords: function (segs) {
              this.computeSegVerticals(segs); // horizontals relies on this
              this.computeFgSegHorizontals(segs); // compute horizontal coordinates, z-index's, and reorder the array
              this.assignSegVerticals(segs);
              this.assignFgSegHorizontals(segs);
          },
  
  
          // Given an array of segments that are all in the same column, sets the backwardCoord and forwardCoord on each.
          // NOTE: Also reorders the given array by date!
          computeFgSegHorizontals: function (segs) {
              var levels;
              var level0;
              var i;
  
              this.sortEventSegs(segs); // order by certain criteria
              levels = buildSlotSegLevels(segs);
              computeForwardSlotSegs(levels);
  
              if ((level0 = levels[0])) {
  
                  for (i = 0; i < level0.length; i++) {
                      computeSlotSegPressures(level0[i]);
                  }
  
                  for (i = 0; i < level0.length; i++) {
                      this.computeFgSegForwardBack(level0[i], 0, 0);
                  }
              }
          },
  
  
          // Calculate seg.forwardCoord and seg.backwardCoord for the segment, where both values range
          // from 0 to 1. If the calendar is left-to-right, the seg.backwardCoord maps to "left" and
          // seg.forwardCoord maps to "right" (via percentage). Vice-versa if the calendar is right-to-left.
          //
          // The segment might be part of a "series", which means consecutive segments with the same pressure
          // who's width is unknown until an edge has been hit. `seriesBackwardPressure` is the number of
          // segments behind this one in the current series, and `seriesBackwardCoord` is the starting
          // coordinate of the first segment in the series.
          computeFgSegForwardBack: function (seg, seriesBackwardPressure, seriesBackwardCoord) {
              var forwardSegs = seg.forwardSegs;
              var i;
  
              if (seg.forwardCoord === undefined) { // not already computed
  
                  if (!forwardSegs.length) {
  
                      // if there are no forward segments, this segment should butt up against the edge
                      seg.forwardCoord = 1;
                  }
                  else {
  
                      // sort highest pressure first
                      this.sortForwardSegs(forwardSegs);
  
                      // this segment's forwardCoord will be calculated from the backwardCoord of the
                      // highest-pressure forward segment.
                      this.computeFgSegForwardBack(forwardSegs[0], seriesBackwardPressure + 1, seriesBackwardCoord);
                      seg.forwardCoord = forwardSegs[0].backwardCoord;
                  }
  
                  // calculate the backwardCoord from the forwardCoord. consider the series
                  seg.backwardCoord = seg.forwardCoord -
                      (seg.forwardCoord - seriesBackwardCoord) / // available width for series
                      (seriesBackwardPressure + 1); // # of segments in the series
  
                  // use this segment's coordinates to computed the coordinates of the less-pressurized
                  // forward segments
                  for (i = 0; i < forwardSegs.length; i++) {
                      this.computeFgSegForwardBack(forwardSegs[i], 0, seg.forwardCoord);
                  }
              }
          },
  
  
          sortForwardSegs: function (forwardSegs) {
              forwardSegs.sort(proxy(this, 'compareForwardSegs'));
          },
  
  
          // A cmp function for determining which forward segment to rely on more when computing coordinates.
          compareForwardSegs: function (seg1, seg2) {
              // put higher-pressure first
              return seg2.forwardPressure - seg1.forwardPressure ||
                  // put segments that are closer to initial edge first (and favor ones with no coords yet)
                  (seg1.backwardCoord || 0) - (seg2.backwardCoord || 0) ||
                  // do normal sorting...
                  this.compareEventSegs(seg1, seg2);
          },
  
  
          // Given foreground event segments that have already had their position coordinates computed,
          // assigns position-related CSS values to their elements.
          assignFgSegHorizontals: function (segs) {
              var i, seg;
  
              for (i = 0; i < segs.length; i++) {
                  seg = segs[i];
                  seg.el.css(this.generateFgSegHorizontalCss(seg));
  
                  // if the height is short, add a className for alternate styling
                  if (seg.bottom - seg.top < 30) {
                      seg.el.addClass('fc-short');
                  }
              }
          },
  
  
          // Generates an object with CSS properties/values that should be applied to an event segment element.
          // Contains important positioning-related properties that should be applied to any event element, customized or not.
          generateFgSegHorizontalCss: function (seg) {
              var shouldOverlap = this.view.opt('slotEventOverlap');
              var backwardCoord = seg.backwardCoord; // the left side if LTR. the right side if RTL. floating-point
              var forwardCoord = seg.forwardCoord; // the right side if LTR. the left side if RTL. floating-point
              var props = this.generateSegVerticalCss(seg); // get top/bottom first
              var left; // amount of space from left edge, a fraction of the total width
              var right; // amount of space from right edge, a fraction of the total width
  
              if (shouldOverlap) {
                  // double the width, but don't go beyond the maximum forward coordinate (1.0)
                  forwardCoord = Math.min(1, backwardCoord + (forwardCoord - backwardCoord) * 2);
              }
  
              if (this.isRTL) {
                  left = 1 - forwardCoord;
                  right = backwardCoord;
              }
              else {
                  left = backwardCoord;
                  right = 1 - forwardCoord;
              }
  
              props.zIndex = seg.level + 1; // convert from 0-base to 1-based
              props.left = left * 100 + '%';
              props.right = right * 100 + '%';
  
              if (shouldOverlap && seg.forwardPressure) {
                  // add padding to the edge so that forward stacked events don't cover the resizer's icon
                  props[this.isRTL ? 'marginLeft' : 'marginRight'] = 10 * 2; // 10 is a guesstimate of the icon's width
              }
  
              return props;
          }
  
      });
  
  
  // Builds an array of segments "levels". The first level will be the leftmost tier of segments if the calendar is
  // left-to-right, or the rightmost if the calendar is right-to-left. Assumes the segments are already ordered by date.
      function buildSlotSegLevels(segs) {
          var levels = [];
          var i, seg;
          var j;
  
          for (i = 0; i < segs.length; i++) {
              seg = segs[i];
  
              // go through all the levels and stop on the first level where there are no collisions
              for (j = 0; j < levels.length; j++) {
                  if (!computeSlotSegCollisions(seg, levels[j]).length) {
                      break;
                  }
              }
  
              seg.level = j;
  
              (levels[j] || (levels[j] = [])).push(seg);
          }
  
          return levels;
      }
  
  
  // For every segment, figure out the other segments that are in subsequent
  // levels that also occupy the same vertical space. Accumulate in seg.forwardSegs
      function computeForwardSlotSegs(levels) {
          var i, level;
          var j, seg;
          var k;
  
          for (i = 0; i < levels.length; i++) {
              level = levels[i];
  
              for (j = 0; j < level.length; j++) {
                  seg = level[j];
  
                  seg.forwardSegs = [];
                  for (k = i + 1; k < levels.length; k++) {
                      computeSlotSegCollisions(seg, levels[k], seg.forwardSegs);
                  }
              }
          }
      }
  
  
  // Figure out which path forward (via seg.forwardSegs) results in the longest path until
  // the furthest edge is reached. The number of segments in this path will be seg.forwardPressure
      function computeSlotSegPressures(seg) {
          var forwardSegs = seg.forwardSegs;
          var forwardPressure = 0;
          var i, forwardSeg;
  
          if (seg.forwardPressure === undefined) { // not already computed
  
              for (i = 0; i < forwardSegs.length; i++) {
                  forwardSeg = forwardSegs[i];
  
                  // figure out the child's maximum forward path
                  computeSlotSegPressures(forwardSeg);
  
                  // either use the existing maximum, or use the child's forward pressure
                  // plus one (for the forwardSeg itself)
                  forwardPressure = Math.max(
                      forwardPressure,
                      1 + forwardSeg.forwardPressure
                  );
              }
  
              seg.forwardPressure = forwardPressure;
          }
      }
  
  
  // Find all the segments in `otherSegs` that vertically collide with `seg`.
  // Append into an optionally-supplied `results` array and return.
      function computeSlotSegCollisions(seg, otherSegs, results) {
          results = results || [];
  
          for (var i = 0; i < otherSegs.length; i++) {
              if (isSlotSegCollision(seg, otherSegs[i])) {
                  results.push(otherSegs[i]);
              }
          }
  
          return results;
      }
  
  
  // Do these segments occupy the same vertical space?
      function isSlotSegCollision(seg1, seg2) {
          return seg1.bottom > seg2.top && seg1.top < seg2.bottom;
      }
  
      ;
      ;
  
      /* An abstract class from which other views inherit from
  ----------------------------------------------------------------------------------------------------------------------*/
  
      var View = FC.View = Class.extend(EmitterMixin, ListenerMixin, {
  
          type: null, // subclass' view name (string)
          name: null, // deprecated. use `type` instead
          title: null, // the text that will be displayed in the header's title
  
          calendar: null, // owner Calendar object
          options: null, // hash containing all options. already merged with view-specific-options
          el: null, // the view's containing element. set by Calendar
  
          isDateSet: false,
          isDateRendered: false,
          dateRenderQueue: null,
  
          isEventsBound: false,
          isEventsSet: false,
          isEventsRendered: false,
          eventRenderQueue: null,
  
          // range the view is actually displaying (moments)
          start: null,
          end: null, // exclusive
  
          // range the view is formally responsible for (moments)
          // may be different from start/end. for example, a month view might have 1st-31st, excluding padded dates
          intervalStart: null,
          intervalEnd: null, // exclusive
          intervalDuration: null,
          intervalUnit: null, // name of largest unit being displayed, like "month" or "week"
  
          isRTL: false,
          isSelected: false, // boolean whether a range of time is user-selected or not
          selectedEvent: null,
  
          eventOrderSpecs: null, // criteria for ordering events when they have same date/time
  
          // classNames styled by jqui themes
          widgetHeaderClass: null,
          widgetContentClass: null,
          highlightStateClass: null,
  
          // for date utils, computed from options
          nextDayThreshold: null,
          isHiddenDayHash: null,
  
          // now indicator
          isNowIndicatorRendered: null,
          initialNowDate: null, // result first getNow call
          initialNowQueriedMs: null, // ms time the getNow was called
          nowIndicatorTimeoutID: null, // for refresh timing of now indicator
          nowIndicatorIntervalID: null, // "
  
  
          constructor: function (calendar, type, options, intervalDuration) {
  
              this.calendar = calendar;
              this.type = this.name = type; // .name is deprecated
              this.options = options;
              this.intervalDuration = intervalDuration || moment.duration(1, 'day');
  
              this.nextDayThreshold = moment.duration(this.opt('nextDayThreshold'));
              this.initThemingProps();
              this.initHiddenDays();
              this.isRTL = this.opt('isRTL');
  
              this.eventOrderSpecs = parseFieldSpecs(this.opt('eventOrder'));
  
              this.dateRenderQueue = new TaskQueue();
              this.eventRenderQueue = new TaskQueue(this.opt('eventRenderWait'));
  
              this.initialize();
          },
  
  
          // A good place for subclasses to initialize member variables
          initialize: function () {
              // subclasses can implement
          },
  
  
          // Retrieves an option with the given name
          opt: function (name) {
              return this.options[name];
          },
  
  
          // Triggers handlers that are view-related. Modifies args before passing to calendar.
          publiclyTrigger: function (name, thisObj) { // arguments beyond thisObj are passed along
              var calendar = this.calendar;
  
              return calendar.publiclyTrigger.apply(
                  calendar,
                  [name, thisObj || this].concat(
                      Array.prototype.slice.call(arguments, 2), // arguments beyond thisObj
                      [this] // always make the last argument a reference to the view. TODO: deprecate
                  )
              );
          },
  
  
          // Returns a proxy of the given promise that will be rejected if the given event fires
          // before the promise resolves.
          rejectOn: function (eventName, promise) {
              var _this = this;
  
              return new Promise(function (resolve, reject) {
                  _this.one(eventName, reject);
  
                  function cleanup() {
                      _this.off(eventName, reject);
                  }
  
                  promise.then(function (res) { // success
                      cleanup();
                      resolve(res);
                  }, function () { // failure
                      cleanup();
                      reject();
                  });
              });
          },
  
  
          /* Date Computation
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Updates all internal dates for displaying the given unzoned range.
          setRange: function (range) {
              $.extend(this, range); // assigns every property to this object's member variables
              this.updateTitle();
          },
  
  
          // Given a single current unzoned date, produce information about what range to display.
          // Subclasses can override. Must return all properties.
          computeRange: function (date) {
              var intervalUnit = computeIntervalUnit(this.intervalDuration);
              var intervalStart = date.clone().startOf(intervalUnit);
              var intervalEnd = intervalStart.clone().add(this.intervalDuration);
              var start, end;
  
              // normalize the range's time-ambiguity
              if (/year|month|week|day/.test(intervalUnit)) { // whole-days?
                  intervalStart.stripTime();
                  intervalEnd.stripTime();
              }
              else { // needs to have a time?
                  if (!intervalStart.hasTime()) {
                      intervalStart = this.calendar.time(0); // give 00:00 time
                  }
                  if (!intervalEnd.hasTime()) {
                      intervalEnd = this.calendar.time(0); // give 00:00 time
                  }
              }
  
              start = intervalStart.clone();
              start = this.skipHiddenDays(start);
              end = intervalEnd.clone();
              end = this.skipHiddenDays(end, -1, true); // exclusively move backwards
  
              return {
                  intervalUnit: intervalUnit,
                  intervalStart: intervalStart,
                  intervalEnd: intervalEnd,
                  start: start,
                  end: end
              };
          },
  
  
          // Computes the new date when the user hits the prev button, given the current date
          computePrevDate: function (date) {
              return this.massageCurrentDate(
                  date.clone().startOf(this.intervalUnit).subtract(this.intervalDuration), -1
              );
          },
  
  
          // Computes the new date when the user hits the next button, given the current date
          computeNextDate: function (date) {
              return this.massageCurrentDate(
                  date.clone().startOf(this.intervalUnit).add(this.intervalDuration)
              );
          },
  
  
          // Given an arbitrarily calculated current date of the calendar, returns a date that is ensured to be completely
          // visible. `direction` is optional and indicates which direction the current date was being
          // incremented or decremented (1 or -1).
          massageCurrentDate: function (date, direction) {
              if (this.intervalDuration.as('days') <= 1) { // if the view displays a single day or smaller
                  if (this.isHiddenDay(date)) {
                      date = this.skipHiddenDays(date, direction);
                      date.startOf('day');
                  }
              }
  
              return date;
          },
  
  
          /* Title and Date Formatting
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Sets the view's title property to the most updated computed value
          updateTitle: function () {
              this.title = this.computeTitle();
              this.calendar.setToolbarsTitle(this.title);
          },
  
  
          // Computes what the title at the top of the calendar should be for this view
          computeTitle: function () {
              var start, end;
  
              // for views that span a large unit of time, show the proper interval, ignoring stray days before and after
              if (this.intervalUnit === 'year' || this.intervalUnit === 'month') {
                  start = this.intervalStart;
                  end = this.intervalEnd;
              }
              else { // for day units or smaller, use the actual day range
                  start = this.start;
                  end = this.end;
              }
  
              return this.formatRange(
                  {
                      // in case intervalStart/End has a time, make sure timezone is correct
                      start: this.calendar.applyTimezone(start),
                      end: this.calendar.applyTimezone(end)
                  },
                  this.opt('titleFormat') || this.computeTitleFormat(),
                  this.opt('titleRangeSeparator')
              );
          },
  
  
          // Generates the format string that should be used to generate the title for the current date range.
          // Attempts to compute the most appropriate format if not explicitly specified with `titleFormat`.
          computeTitleFormat: function () {
              if (this.intervalUnit == 'year') {
                  return 'YYYY';
              }
              else if (this.intervalUnit == 'month') {
                  return this.opt('monthYearFormat'); // like "September 2014"
              }
              else if (this.intervalDuration.as('days') > 1) {
                  return 'll'; // multi-day range. shorter, like "Sep 9 - 10 2014"
              }
              else {
                  return 'LL'; // one day. longer, like "September 9 2014"
              }
          },
  
  
          // Utility for formatting a range. Accepts a range object, formatting string, and optional separator.
          // Displays all-day ranges naturally, with an inclusive end. Takes the current isRTL into account.
          // The timezones of the dates within `range` will be respected.
          formatRange: function (range, formatStr, separator) {
              var end = range.end;
  
              if (!end.hasTime()) { // all-day?
                  end = end.clone().subtract(1); // convert to inclusive. last ms of previous day
              }
  
              return formatRange(range.start, end, formatStr, separator, this.opt('isRTL'));
          },
  
  
          getAllDayHtml: function () {
              return this.opt('allDayHtml') || htmlEscape(this.opt('allDayText'));
          },
  
  
          /* Navigation
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Generates HTML for an anchor to another view into the calendar.
          // Will either generate an <a> tag or a non-clickable <span> tag, depending on enabled settings.
          // `gotoOptions` can either be a moment input, or an object with the form:
          // { date, type, forceOff }
          // `type` is a view-type like "day" or "week". default value is "day".
          // `attrs` and `innerHtml` are use to generate the rest of the HTML tag.
          buildGotoAnchorHtml: function (gotoOptions, attrs, innerHtml) {
              var date, type, forceOff;
              var finalOptions;
  
              if ($.isPlainObject(gotoOptions)) {
                  date = gotoOptions.date;
                  type = gotoOptions.type;
                  forceOff = gotoOptions.forceOff;
              }
              else {
                  date = gotoOptions; // a single moment input
              }
              date = FC.moment(date); // if a string, parse it
  
              finalOptions = { // for serialization into the link
                  date: date.format('YYYY-MM-DD'),
                  type: type || 'day'
              };
  
              if (typeof attrs === 'string') {
                  innerHtml = attrs;
                  attrs = null;
              }
  
              attrs = attrs ? ' ' + attrsToStr(attrs) : ''; // will have a leading space
              innerHtml = innerHtml || '';
  
              if (!forceOff && this.opt('navLinks')) {
                  return '<a' + attrs +
                      ' data-goto="' + htmlEscape(JSON.stringify(finalOptions)) + '">' +
                      innerHtml +
                      '</a>';
              }
              else {
                  return '<span' + attrs + '>' +
                      innerHtml +
                      '</span>';
              }
          },
  
  
          // Rendering Non-date-related Content
          // -----------------------------------------------------------------------------------------------------------------
  
  
          // Sets the container element that the view should render inside of, does global DOM-related initializations,
          // and renders all the non-date-related content inside.
          setElement: function (el) {
              this.el = el;
              this.bindGlobalHandlers();
              this.renderSkeleton();
          },
  
  
          // Removes the view's container element from the DOM, clearing any content beforehand.
          // Undoes any other DOM-related attachments.
          removeElement: function () {
              this.unsetDate();
              this.unrenderSkeleton();
  
              this.unbindGlobalHandlers();
  
              this.el.remove();
              // NOTE: don't null-out this.el in case the View was destroyed within an API callback.
              // We don't null-out the View's other jQuery element references upon destroy,
              //  so we shouldn't kill this.el either.
          },
  
  
          // Renders the basic structure of the view before any content is rendered
          renderSkeleton: function () {
              // subclasses should implement
          },
  
  
          // Unrenders the basic structure of the view
          unrenderSkeleton: function () {
              // subclasses should implement
          },
  
  
          // Date Setting/Unsetting
          // -----------------------------------------------------------------------------------------------------------------
  
  
          setDate: function (date) {
              var isReset = this.isDateSet;
  
              this.isDateSet = true;
              this.handleDate(date, isReset);
              this.trigger(isReset ? 'dateReset' : 'dateSet', date);
          },
  
  
          unsetDate: function () {
              if (this.isDateSet) {
                  this.isDateSet = false;
                  this.handleDateUnset();
                  this.trigger('dateUnset');
              }
          },
  
  
          // Date Handling
          // -----------------------------------------------------------------------------------------------------------------
  
  
          handleDate: function (date, isReset) {
              var _this = this;
  
              this.unbindEvents(); // will do nothing if not already bound
              this.requestDateRender(date).then(function () {
                  // wish we could start earlier, but setRange/computeRange needs to execute first
                  _this.bindEvents(); // will request events
              });
          },
  
  
          handleDateUnset: function () {
              this.unbindEvents();
              this.requestDateUnrender();
          },
  
  
          // Date Render Queuing
          // -----------------------------------------------------------------------------------------------------------------
  
  
          // if date not specified, uses current
          requestDateRender: function (date) {
              var _this = this;
  
              return this.dateRenderQueue.add(function () {
                  return _this.executeDateRender(date);
              });
          },
  
  
          requestDateUnrender: function () {
              var _this = this;
  
              return this.dateRenderQueue.add(function () {
                  return _this.executeDateUnrender();
              });
          },
  
  
          // Date High-level Rendering
          // -----------------------------------------------------------------------------------------------------------------
  
  
          // if date not specified, uses current
          executeDateRender: function (date) {
              var _this = this;
  
              // if rendering a new date, reset scroll to initial state (scrollTime)
              if (date) {
                  this.captureInitialScroll();
              }
              else {
                  this.captureScroll(); // a rerender of the current date
              }
  
              this.freezeHeight();
  
              return this.executeDateUnrender().then(function () {
  
                  if (date) {
                      _this.setRange(_this.computeRange(date));
                  }
  
                  if (_this.render) {
                      _this.render(); // TODO: deprecate
                  }
  
                  _this.renderDates();
                  _this.updateSize();
                  _this.renderBusinessHours(); // might need coordinates, so should go after updateSize()
                  _this.startNowIndicator();
  
                  _this.thawHeight();
                  _this.releaseScroll();
  
                  _this.isDateRendered = true;
                  _this.onDateRender();
                  _this.trigger('dateRender');
              });
          },
  
  
          executeDateUnrender: function () {
              var _this = this;
  
              if (_this.isDateRendered) {
                  return this.requestEventsUnrender().then(function () {
  
                      _this.unselect();
                      _this.stopNowIndicator();
                      _this.triggerUnrender();
                      _this.unrenderBusinessHours();
                      _this.unrenderDates();
  
                      if (_this.destroy) {
                          _this.destroy(); // TODO: deprecate
                      }
  
                      _this.isDateRendered = false;
                      _this.trigger('dateUnrender');
                  });
              }
              else {
                  return Promise.resolve();
              }
          },
  
  
          // Date Rendering Triggers
          // -----------------------------------------------------------------------------------------------------------------
  
  
          onDateRender: function () {
              this.triggerRender();
          },
  
  
          // Date Low-level Rendering
          // -----------------------------------------------------------------------------------------------------------------
  
  
          // date-cell content only
          renderDates: function () {
              // subclasses should implement
          },
  
  
          // date-cell content only
          unrenderDates: function () {
              // subclasses should override
          },
  
  
          // Misc view rendering utils
          // -------------------------
  
  
          // Signals that the view's content has been rendered
          triggerRender: function () {
              this.publiclyTrigger('viewRender', this, this, this.el);
          },
  
  
          // Signals that the view's content is about to be unrendered
          triggerUnrender: function () {
              this.publiclyTrigger('viewDestroy', this, this, this.el);
          },
  
  
          // Binds DOM handlers to elements that reside outside the view container, such as the document
          bindGlobalHandlers: function () {
              this.listenTo(GlobalEmitter.get(), {
                  touchstart: this.processUnselect,
                  mousedown: this.handleDocumentMousedown
              });
          },
  
  
          // Unbinds DOM handlers from elements that reside outside the view container
          unbindGlobalHandlers: function () {
              this.stopListeningTo(GlobalEmitter.get());
          },
  
  
          // Initializes internal variables related to theming
          initThemingProps: function () {
              var tm = this.opt('theme') ? 'ui' : 'fc';
  
              this.widgetHeaderClass = tm + '-widget-header';
              this.widgetContentClass = tm + '-widget-content';
              this.highlightStateClass = tm + '-state-highlight';
          },
  
  
          /* Business Hours
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders business-hours onto the view. Assumes updateSize has already been called.
          renderBusinessHours: function () {
              // subclasses should implement
          },
  
  
          // Unrenders previously-rendered business-hours
          unrenderBusinessHours: function () {
              // subclasses should implement
          },
  
  
          /* Now Indicator
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Immediately render the current time indicator and begins re-rendering it at an interval,
          // which is defined by this.getNowIndicatorUnit().
          // TODO: somehow do this for the current whole day's background too
          startNowIndicator: function () {
              var _this = this;
              var unit;
              var update;
              var delay; // ms wait value
  
              if (this.opt('nowIndicator')) {
                  unit = this.getNowIndicatorUnit();
                  if (unit) {
                      update = proxy(this, 'updateNowIndicator'); // bind to `this`
  
                      this.initialNowDate = this.calendar.getNow();
                      this.initialNowQueriedMs = +new Date();
                      this.renderNowIndicator(this.initialNowDate);
                      this.isNowIndicatorRendered = true;
  
                      // wait until the beginning of the next interval
                      delay = this.initialNowDate.clone().startOf(unit).add(1, unit) - this.initialNowDate;
                      this.nowIndicatorTimeoutID = setTimeout(function () {
                          _this.nowIndicatorTimeoutID = null;
                          update();
                          delay = +moment.duration(1, unit);
                          delay = Math.max(100, delay); // prevent too frequent
                          _this.nowIndicatorIntervalID = setInterval(update, delay); // update every interval
                      }, delay);
                  }
              }
          },
  
  
          // rerenders the now indicator, computing the new current time from the amount of time that has passed
          // since the initial getNow call.
          updateNowIndicator: function () {
              if (this.isNowIndicatorRendered) {
                  this.unrenderNowIndicator();
                  this.renderNowIndicator(
                      this.initialNowDate.clone().add(new Date() - this.initialNowQueriedMs) // add ms
                  );
              }
          },
  
  
          // Immediately unrenders the view's current time indicator and stops any re-rendering timers.
          // Won't cause side effects if indicator isn't rendered.
          stopNowIndicator: function () {
              if (this.isNowIndicatorRendered) {
  
                  if (this.nowIndicatorTimeoutID) {
                      clearTimeout(this.nowIndicatorTimeoutID);
                      this.nowIndicatorTimeoutID = null;
                  }
                  if (this.nowIndicatorIntervalID) {
                      clearTimeout(this.nowIndicatorIntervalID);
                      this.nowIndicatorIntervalID = null;
                  }
  
                  this.unrenderNowIndicator();
                  this.isNowIndicatorRendered = false;
              }
          },
  
  
          // Returns a string unit, like 'second' or 'minute' that defined how often the current time indicator
          // should be refreshed. If something falsy is returned, no time indicator is rendered at all.
          getNowIndicatorUnit: function () {
              // subclasses should implement
          },
  
  
          // Renders a current time indicator at the given datetime
          renderNowIndicator: function (date) {
              // subclasses should implement
          },
  
  
          // Undoes the rendering actions from renderNowIndicator
          unrenderNowIndicator: function () {
              // subclasses should implement
          },
  
  
          /* Dimensions
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Refreshes anything dependant upon sizing of the container element of the grid
          updateSize: function (isResize) {
  
              if (isResize) {
                  this.captureScroll();
              }
  
              this.updateHeight(isResize);
              this.updateWidth(isResize);
              this.updateNowIndicator();
  
              if (isResize) {
                  this.releaseScroll();
              }
          },
  
  
          // Refreshes the horizontal dimensions of the calendar
          updateWidth: function (isResize) {
              // subclasses should implement
          },
  
  
          // Refreshes the vertical dimensions of the calendar
          updateHeight: function (isResize) {
              var calendar = this.calendar; // we poll the calendar for height information
  
              this.setHeight(
                  calendar.getSuggestedViewHeight(),
                  calendar.isHeightAuto()
              );
          },
  
  
          // Updates the vertical dimensions of the calendar to the specified height.
          // if `isAuto` is set to true, height becomes merely a suggestion and the view should use its "natural" height.
          setHeight: function (height, isAuto) {
              // subclasses should implement
          },
  
  
          /* Scroller
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          capturedScroll: null,
          capturedScrollDepth: 0,
  
  
          captureScroll: function () {
              if (!(this.capturedScrollDepth++)) {
                  this.capturedScroll = this.isDateRendered ? this.queryScroll() : {}; // require a render first
                  return true; // root?
              }
              return false;
          },
  
  
          captureInitialScroll: function (forcedScroll) {
              if (this.captureScroll()) { // root?
                  this.capturedScroll.isInitial = true;
  
                  if (forcedScroll) {
                      $.extend(this.capturedScroll, forcedScroll);
                  }
                  else {
                      this.capturedScroll.isComputed = true;
                  }
              }
          },
  
  
          releaseScroll: function () {
              var scroll = this.capturedScroll;
              var isRoot = this.discardScroll();
  
              if (scroll.isComputed) {
                  if (isRoot) {
                      // only compute initial scroll if it will actually be used (is the root capture)
                      $.extend(scroll, this.computeInitialScroll());
                  }
                  else {
                      scroll = null; // scroll couldn't be computed. don't apply it to the DOM
                  }
              }
  
              if (scroll) {
                  // we act immediately on a releaseScroll operation, as opposed to captureScroll.
                  // if capture/release wraps a render operation that screws up the scroll,
                  // we still want to restore it a good state after, regardless of depth.
  
                  if (scroll.isInitial) {
                      this.hardSetScroll(scroll); // outsmart how browsers set scroll on initial DOM
                  }
                  else {
                      this.setScroll(scroll);
                  }
              }
          },
  
  
          discardScroll: function () {
              if (!(--this.capturedScrollDepth)) {
                  this.capturedScroll = null;
                  return true; // root?
              }
              return false;
          },
  
  
          computeInitialScroll: function () {
              return {};
          },
  
  
          queryScroll: function () {
              return {};
          },
  
  
          hardSetScroll: function (scroll) {
              var _this = this;
              var exec = function () {
                  _this.setScroll(scroll);
              };
              exec();
              setTimeout(exec, 0); // to surely clear the browser's initial scroll for the DOM
          },
  
  
          setScroll: function (scroll) {
          },
  
  
          /* Height Freezing
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          freezeHeight: function () {
              this.calendar.freezeContentHeight();
          },
  
  
          thawHeight: function () {
              this.calendar.thawContentHeight();
          },
  
  
          // Event Binding/Unbinding
          // -----------------------------------------------------------------------------------------------------------------
  
  
          bindEvents: function () {
              var _this = this;
  
              if (!this.isEventsBound) {
                  this.isEventsBound = true;
                  this.rejectOn('eventsUnbind', this.requestEvents()).then(function (events) { // TODO: test rejection
                      _this.listenTo(_this.calendar, 'eventsReset', _this.setEvents);
                      _this.setEvents(events);
                  });
              }
          },
  
  
          unbindEvents: function () {
              if (this.isEventsBound) {
                  this.isEventsBound = false;
                  this.stopListeningTo(this.calendar, 'eventsReset');
                  this.unsetEvents();
                  this.trigger('eventsUnbind');
              }
          },
  
  
          // Event Setting/Unsetting
          // -----------------------------------------------------------------------------------------------------------------
  
  
          setEvents: function (events) {
              var isReset = this.isEventSet;
  
              this.isEventsSet = true;
              this.handleEvents(events, isReset);
              this.trigger(isReset ? 'eventsReset' : 'eventsSet', events);
          },
  
  
          unsetEvents: function () {
              if (this.isEventsSet) {
                  this.isEventsSet = false;
                  this.handleEventsUnset();
                  this.trigger('eventsUnset');
              }
          },
  
  
          whenEventsSet: function () {
              var _this = this;
  
              if (this.isEventsSet) {
                  return Promise.resolve(this.getCurrentEvents());
              }
              else {
                  return new Promise(function (resolve) {
                      _this.one('eventsSet', resolve);
                  });
              }
          },
  
  
          // Event Handling
          // -----------------------------------------------------------------------------------------------------------------
  
  
          handleEvents: function (events, isReset) {
              this.requestEventsRender(events);
          },
  
  
          handleEventsUnset: function () {
              this.requestEventsUnrender();
          },
  
  
          // Event Render Queuing
          // -----------------------------------------------------------------------------------------------------------------
  
  
          // assumes any previous event renders have been cleared already
          requestEventsRender: function (events) {
              var _this = this;
  
              return this.eventRenderQueue.add(function () { // might not return a promise if debounced!? bad
                  return _this.executeEventsRender(events);
              });
          },
  
  
          requestEventsUnrender: function () {
              var _this = this;
  
              if (this.isEventsRendered) {
                  return this.eventRenderQueue.addQuickly(function () {
                      return _this.executeEventsUnrender();
                  });
              }
              else {
                  return Promise.resolve();
              }
          },
  
  
          requestCurrentEventsRender: function () {
              if (this.isEventsSet) {
                  this.requestEventsRender(this.getCurrentEvents());
              }
              else {
                  return Promise.reject();
              }
          },
  
  
          // Event High-level Rendering
          // -----------------------------------------------------------------------------------------------------------------
  
  
          executeEventsRender: function (events) {
              var _this = this;
  
              this.captureScroll();
              this.freezeHeight();
  
              return this.executeEventsUnrender().then(function () {
                  _this.renderEvents(events);
  
                  _this.thawHeight();
                  _this.releaseScroll();
  
                  _this.isEventsRendered = true;
                  _this.onEventsRender();
                  _this.trigger('eventsRender');
              });
          },
  
  
          executeEventsUnrender: function () {
              if (this.isEventsRendered) {
                  this.onBeforeEventsUnrender();
  
                  this.captureScroll();
                  this.freezeHeight();
  
                  if (this.destroyEvents) {
                      this.destroyEvents(); // TODO: deprecate
                  }
  
                  this.unrenderEvents();
  
                  this.thawHeight();
                  this.releaseScroll();
  
                  this.isEventsRendered = false;
                  this.trigger('eventsUnrender');
              }
  
              return Promise.resolve(); // always synchronous
          },
  
  
          // Event Rendering Triggers
          // -----------------------------------------------------------------------------------------------------------------
  
  
          // Signals that all events have been rendered
          onEventsRender: function () {
              this.renderedEventSegEach(function (seg) {
                  this.publiclyTrigger('eventAfterRender', seg.event, seg.event, seg.el);
              });
              this.publiclyTrigger('eventAfterAllRender');
          },
  
  
          // Signals that all event elements are about to be removed
          onBeforeEventsUnrender: function () {
              this.renderedEventSegEach(function (seg) {
                  this.publiclyTrigger('eventDestroy', seg.event, seg.event, seg.el);
              });
          },
  
  
          // Event Low-level Rendering
          // -----------------------------------------------------------------------------------------------------------------
  
  
          // Renders the events onto the view.
          renderEvents: function (events) {
              // subclasses should implement
          },
  
  
          // Removes event elements from the view.
          unrenderEvents: function () {
              // subclasses should implement
          },
  
  
          // Event Data Access
          // -----------------------------------------------------------------------------------------------------------------
  
  
          requestEvents: function () {
              return this.calendar.requestEvents(this.start, this.end);
          },
  
  
          getCurrentEvents: function () {
              return this.calendar.getPrunedEventCache();
          },
  
  
          // Event Rendering Utils
          // -----------------------------------------------------------------------------------------------------------------
  
  
          // Given an event and the default element used for rendering, returns the element that should actually be used.
          // Basically runs events and elements through the eventRender hook.
          resolveEventEl: function (event, el) {
              var custom = this.publiclyTrigger('eventRender', event, event, el);
  
              if (custom === false) { // means don't render at all
                  el = null;
              }
              else if (custom && custom !== true) {
                  el = $(custom);
              }
  
              return el;
          },
  
  
          // Hides all rendered event segments linked to the given event
          showEvent: function (event) {
              this.renderedEventSegEach(function (seg) {
                  seg.el.css('visibility', '');
              }, event);
          },
  
  
          // Shows all rendered event segments linked to the given event
          hideEvent: function (event) {
              this.renderedEventSegEach(function (seg) {
                  seg.el.css('visibility', 'hidden');
              }, event);
          },
  
  
          // Iterates through event segments that have been rendered (have an el). Goes through all by default.
          // If the optional `event` argument is specified, only iterates through segments linked to that event.
          // The `this` value of the callback function will be the view.
          renderedEventSegEach: function (func, event) {
              var segs = this.getEventSegs();
              var i;
  
              for (i = 0; i < segs.length; i++) {
                  if (!event || segs[i].event._id === event._id) {
                      if (segs[i].el) {
                          func.call(this, segs[i]);
                      }
                  }
              }
          },
  
  
          // Retrieves all the rendered segment objects for the view
          getEventSegs: function () {
              // subclasses must implement
              return [];
          },
  
  
          /* Event Drag-n-Drop
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Computes if the given event is allowed to be dragged by the user
          isEventDraggable: function (event) {
              return this.isEventStartEditable(event);
          },
  
  
          isEventStartEditable: function (event) {
              return firstDefined(
                  event.startEditable,
                  (event.source || {}).startEditable,
                  this.opt('eventStartEditable'),
                  this.isEventGenerallyEditable(event)
              );
          },
  
  
          isEventGenerallyEditable: function (event) {
              return firstDefined(
                  event.editable,
                  (event.source || {}).editable,
                  this.opt('editable')
              );
          },
  
  
          // Must be called when an event in the view is dropped onto new location.
          // `dropLocation` is an object that contains the new zoned start/end/allDay values for the event.
          reportSegDrop: function (seg, dropLocation, largeUnit, el, ev) {
              var calendar = this.calendar;
              var mutateResult = calendar.mutateSeg(seg, dropLocation, largeUnit);
              var undoFunc = function () {
                  mutateResult.undo();
                  calendar.reportEventChange();
              };
  
              this.triggerEventDrop(seg.event, mutateResult.dateDelta, undoFunc, el, ev);
              calendar.reportEventChange(); // will rerender events
          },
  
  
          // Triggers event-drop handlers that have subscribed via the API
          triggerEventDrop: function (event, dateDelta, undoFunc, el, ev) {
              this.publiclyTrigger('eventDrop', el[0], event, dateDelta, undoFunc, ev, {}); // {} = jqui dummy
          },
  
  
          /* External Element Drag-n-Drop
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Must be called when an external element, via jQuery UI, has been dropped onto the calendar.
          // `meta` is the parsed data that has been embedded into the dragging event.
          // `dropLocation` is an object that contains the new zoned start/end/allDay values for the event.
          reportExternalDrop: function (meta, dropLocation, el, ev, ui) {
              var eventProps = meta.eventProps;
              var eventInput;
              var event;
  
              // Try to build an event object and render it. TODO: decouple the two
              if (eventProps) {
                  eventInput = $.extend({}, eventProps, dropLocation);
                  event = this.calendar.renderEvent(eventInput, meta.stick)[0]; // renderEvent returns an array
              }
  
              this.triggerExternalDrop(event, dropLocation, el, ev, ui);
          },
  
  
          // Triggers external-drop handlers that have subscribed via the API
          triggerExternalDrop: function (event, dropLocation, el, ev, ui) {
  
              // trigger 'drop' regardless of whether element represents an event
              this.publiclyTrigger('drop', el[0], dropLocation.start, ev, ui);
  
              if (event) {
                  this.publiclyTrigger('eventReceive', null, event); // signal an external event landed
              }
          },
  
  
          /* Drag-n-Drop Rendering (for both events and external elements)
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a visual indication of a event or external-element drag over the given drop zone.
          // If an external-element, seg will be `null`.
          // Must return elements used for any mock events.
          renderDrag: function (dropLocation, seg) {
              // subclasses must implement
          },
  
  
          // Unrenders a visual indication of an event or external-element being dragged.
          unrenderDrag: function () {
              // subclasses must implement
          },
  
  
          /* Event Resizing
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Computes if the given event is allowed to be resized from its starting edge
          isEventResizableFromStart: function (event) {
              return this.opt('eventResizableFromStart') && this.isEventResizable(event);
          },
  
  
          // Computes if the given event is allowed to be resized from its ending edge
          isEventResizableFromEnd: function (event) {
              return this.isEventResizable(event);
          },
  
  
          // Computes if the given event is allowed to be resized by the user at all
          isEventResizable: function (event) {
              var source = event.source || {};
  
              return firstDefined(
                  event.durationEditable,
                  source.durationEditable,
                  this.opt('eventDurationEditable'),
                  event.editable,
                  source.editable,
                  this.opt('editable')
              );
          },
  
  
          // Must be called when an event in the view has been resized to a new length
          reportSegResize: function (seg, resizeLocation, largeUnit, el, ev) {
              var calendar = this.calendar;
              var mutateResult = calendar.mutateSeg(seg, resizeLocation, largeUnit);
              var undoFunc = function () {
                  mutateResult.undo();
                  calendar.reportEventChange();
              };
  
              this.triggerEventResize(seg.event, mutateResult.durationDelta, undoFunc, el, ev);
              calendar.reportEventChange(); // will rerender events
          },
  
  
          // Triggers event-resize handlers that have subscribed via the API
          triggerEventResize: function (event, durationDelta, undoFunc, el, ev) {
              this.publiclyTrigger('eventResize', el[0], event, durationDelta, undoFunc, ev, {}); // {} = jqui dummy
          },
  
  
          /* Selection (time range)
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Selects a date span on the view. `start` and `end` are both Moments.
          // `ev` is the native mouse event that begin the interaction.
          select: function (span, ev) {
              this.unselect(ev);
              this.renderSelection(span);
              this.reportSelection(span, ev);
          },
  
  
          // Renders a visual indication of the selection
          renderSelection: function (span) {
              // subclasses should implement
          },
  
  
          // Called when a new selection is made. Updates internal state and triggers handlers.
          reportSelection: function (span, ev) {
              this.isSelected = true;
              this.triggerSelect(span, ev);
          },
  
  
          // Triggers handlers to 'select'
          triggerSelect: function (span, ev) {
              this.publiclyTrigger(
                  'select',
                  null,
                  this.calendar.applyTimezone(span.start), // convert to calendar's tz for external API
                  this.calendar.applyTimezone(span.end), // "
                  ev
              );
          },
  
  
          // Undoes a selection. updates in the internal state and triggers handlers.
          // `ev` is the native mouse event that began the interaction.
          unselect: function (ev) {
              if (this.isSelected) {
                  this.isSelected = false;
                  if (this.destroySelection) {
                      this.destroySelection(); // TODO: deprecate
                  }
                  this.unrenderSelection();
                  this.publiclyTrigger('unselect', null, ev);
              }
          },
  
  
          // Unrenders a visual indication of selection
          unrenderSelection: function () {
              // subclasses should implement
          },
  
  
          /* Event Selection
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          selectEvent: function (event) {
              if (!this.selectedEvent || this.selectedEvent !== event) {
                  this.unselectEvent();
                  this.renderedEventSegEach(function (seg) {
                      seg.el.addClass('fc-selected');
                  }, event);
                  this.selectedEvent = event;
              }
          },
  
  
          unselectEvent: function () {
              if (this.selectedEvent) {
                  this.renderedEventSegEach(function (seg) {
                      seg.el.removeClass('fc-selected');
                  }, this.selectedEvent);
                  this.selectedEvent = null;
              }
          },
  
  
          isEventSelected: function (event) {
              // event references might change on refetchEvents(), while selectedEvent doesn't,
              // so compare IDs
              return this.selectedEvent && this.selectedEvent._id === event._id;
          },
  
  
          /* Mouse / Touch Unselecting (time range & event unselection)
  	------------------------------------------------------------------------------------------------------------------*/
          // TODO: move consistently to down/start or up/end?
          // TODO: don't kill previous selection if touch scrolling
  
  
          handleDocumentMousedown: function (ev) {
              if (isPrimaryMouseButton(ev)) {
                  this.processUnselect(ev);
              }
          },
  
  
          processUnselect: function (ev) {
              this.processRangeUnselect(ev);
              this.processEventUnselect(ev);
          },
  
  
          processRangeUnselect: function (ev) {
              var ignore;
  
              // is there a time-range selection?
              if (this.isSelected && this.opt('unselectAuto')) {
                  // only unselect if the clicked element is not identical to or inside of an 'unselectCancel' element
                  ignore = this.opt('unselectCancel');
                  if (!ignore || !$(ev.target).closest(ignore).length) {
                      this.unselect(ev);
                  }
              }
          },
  
  
          processEventUnselect: function (ev) {
              if (this.selectedEvent) {
                  if (!$(ev.target).closest('.fc-selected').length) {
                      this.unselectEvent();
                  }
              }
          },
  
  
          /* Day Click
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Triggers handlers to 'dayClick'
          // Span has start/end of the clicked area. Only the start is useful.
          triggerDayClick: function (span, dayEl, ev) {
              this.publiclyTrigger(
                  'dayClick',
                  dayEl,
                  this.calendar.applyTimezone(span.start), // convert to calendar's timezone for external API
                  ev
              );
          },
  
  
          /* Date Utils
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Initializes internal variables related to calculating hidden days-of-week
          initHiddenDays: function () {
              var hiddenDays = this.opt('hiddenDays') || []; // array of day-of-week indices that are hidden
              var isHiddenDayHash = []; // is the day-of-week hidden? (hash with day-of-week-index -> bool)
              var dayCnt = 0;
              var i;
  
              if (this.opt('weekends') === false) {
                  hiddenDays.push(0, 6); // 0=sunday, 6=saturday
              }
  
              for (i = 0; i < 7; i++) {
                  if (
                      !(isHiddenDayHash[i] = $.inArray(i, hiddenDays) !== -1)
                  ) {
                      dayCnt++;
                  }
              }
  
              if (!dayCnt) {
                  throw 'invalid hiddenDays'; // all days were hidden? bad.
              }
  
              this.isHiddenDayHash = isHiddenDayHash;
          },
  
  
          // Is the current day hidden?
          // `day` is a day-of-week index (0-6), or a Moment
          isHiddenDay: function (day) {
              if (moment.isMoment(day)) {
                  day = day.day();
              }
              return this.isHiddenDayHash[day];
          },
  
  
          // Incrementing the current day until it is no longer a hidden day, returning a copy.
          // If the initial value of `date` is not a hidden day, don't do anything.
          // Pass `isExclusive` as `true` if you are dealing with an end date.
          // `inc` defaults to `1` (increment one day forward each time)
          skipHiddenDays: function (date, inc, isExclusive) {
              var out = date.clone();
              inc = inc || 1;
              while (
                  this.isHiddenDayHash[(out.day() + (isExclusive ? inc : 0) + 7) % 7]
                  ) {
                  out.add(inc, 'days');
              }
              return out;
          },
  
  
          // Returns the date range of the full days the given range visually appears to occupy.
          // Returns a new range object.
          computeDayRange: function (range) {
              var startDay = range.start.clone().stripTime(); // the beginning of the day the range starts
              var end = range.end;
              var endDay = null;
              var endTimeMS;
  
              if (end) {
                  endDay = end.clone().stripTime(); // the beginning of the day the range exclusively ends
                  endTimeMS = +end.time(); // # of milliseconds into `endDay`
  
                  // If the end time is actually inclusively part of the next day and is equal to or
                  // beyond the next day threshold, adjust the end to be the exclusive end of `endDay`.
                  // Otherwise, leaving it as inclusive will cause it to exclude `endDay`.
                  if (endTimeMS && endTimeMS >= this.nextDayThreshold) {
                      endDay.add(1, 'days');
                  }
              }
  
              // If no end was specified, or if it is within `startDay` but not past nextDayThreshold,
              // assign the default duration of one day.
              if (!end || endDay <= startDay) {
                  endDay = startDay.clone().add(1, 'days');
              }
  
              return {start: startDay, end: endDay};
          },
  
  
          // Does the given event visually appear to occupy more than one day?
          isMultiDayEvent: function (event) {
              var range = this.computeDayRange(event); // event is range-ish
  
              return range.end.diff(range.start, 'days') > 1;
          }
  
      });
  
      ;
      ;
  
      /*
  Embodies a div that has potential scrollbars
  */
      var Scroller = FC.Scroller = Class.extend({
  
          el: null, // the guaranteed outer element
          scrollEl: null, // the element with the scrollbars
          overflowX: null,
          overflowY: null,
  
  
          constructor: function (options) {
              options = options || {};
              this.overflowX = options.overflowX || options.overflow || 'auto';
              this.overflowY = options.overflowY || options.overflow || 'auto';
          },
  
  
          render: function () {
              this.el = this.renderEl();
              this.applyOverflow();
          },
  
  
          renderEl: function () {
              return (this.scrollEl = $('<div class="fc-scroller"></div>'));
          },
  
  
          // sets to natural height, unlocks overflow
          clear: function () {
              this.setHeight('auto');
              this.applyOverflow();
          },
  
  
          destroy: function () {
              this.el.remove();
          },
  
  
          // Overflow
          // -----------------------------------------------------------------------------------------------------------------
  
  
          applyOverflow: function () {
              this.scrollEl.css({
                  'overflow-x': this.overflowX,
                  'overflow-y': this.overflowY
              });
          },
  
  
          // Causes any 'auto' overflow values to resolves to 'scroll' or 'hidden'.
          // Useful for preserving scrollbar widths regardless of future resizes.
          // Can pass in scrollbarWidths for optimization.
          lockOverflow: function (scrollbarWidths) {
              var overflowX = this.overflowX;
              var overflowY = this.overflowY;
  
              scrollbarWidths = scrollbarWidths || this.getScrollbarWidths();
  
              if (overflowX === 'auto') {
                  overflowX = (
                      scrollbarWidths.top || scrollbarWidths.bottom || // horizontal scrollbars?
                      // OR scrolling pane with massless scrollbars?
                      this.scrollEl[0].scrollWidth - 1 > this.scrollEl[0].clientWidth
                      // subtract 1 because of IE off-by-one issue
                  ) ? 'scroll' : 'hidden';
              }
  
              if (overflowY === 'auto') {
                  overflowY = (
                      scrollbarWidths.left || scrollbarWidths.right || // vertical scrollbars?
                      // OR scrolling pane with massless scrollbars?
                      this.scrollEl[0].scrollHeight - 1 > this.scrollEl[0].clientHeight
                      // subtract 1 because of IE off-by-one issue
                  ) ? 'scroll' : 'hidden';
              }
  
              this.scrollEl.css({'overflow-x': overflowX, 'overflow-y': overflowY});
          },
  
  
          // Getters / Setters
          // -----------------------------------------------------------------------------------------------------------------
  
  
          setHeight: function (height) {
              this.scrollEl.height(height);
          },
  
  
          getScrollTop: function () {
              return this.scrollEl.scrollTop();
          },
  
  
          setScrollTop: function (top) {
              this.scrollEl.scrollTop(top);
          },
  
  
          getClientWidth: function () {
              return this.scrollEl[0].clientWidth;
          },
  
  
          getClientHeight: function () {
              return this.scrollEl[0].clientHeight;
          },
  
  
          getScrollbarWidths: function () {
              return getScrollbarWidths(this.scrollEl);
          }
  
      });
  
      ;
      ;
  
      function Iterator(items) {
          this.items = items || [];
      }
  
  
      /* Calls a method on every item passing the arguments through */
      Iterator.prototype.proxyCall = function (methodName) {
          var args = Array.prototype.slice.call(arguments, 1);
          var results = [];
  
          this.items.forEach(function (item) {
              results.push(item[methodName].apply(item, args));
          });
  
          return results;
      };
  
      ;
      ;
  
      /* Toolbar with buttons and title
  ----------------------------------------------------------------------------------------------------------------------*/
  
      function Toolbar(calendar, toolbarOptions) {
          var t = this;
  
          // exports
          t.setToolbarOptions = setToolbarOptions;
          t.render = render;
          t.removeElement = removeElement;
          t.updateTitle = updateTitle;
          t.activateButton = activateButton;
          t.deactivateButton = deactivateButton;
          t.disableButton = disableButton;
          t.enableButton = enableButton;
          t.getViewsWithButtons = getViewsWithButtons;
          t.el = null; // mirrors local `el`
  
          // locals
          var el;
          var viewsWithButtons = [];
          var tm;
  
          // method to update toolbar-specific options, not calendar-wide options
          function setToolbarOptions(newToolbarOptions) {
              toolbarOptions = newToolbarOptions;
          }
  
          // can be called repeatedly and will rerender
          function render() {
              var sections = toolbarOptions.layout;
  
              tm = calendar.options.theme ? 'ui' : 'fc';
  
              if (sections) {
                  if (!el) {
                      el = this.el = $("<div class='fc-toolbar " + toolbarOptions.extraClasses + "'/>");
                  }
                  else {
                      el.empty();
                  }
                  el.append(renderSection('left'))
                      .append(renderSection('right'))
                      .append(renderSection('center'))
                      .append('<div class="fc-clear"/>');
              }
              else {
                  removeElement();
              }
          }
  
  
          function removeElement() {
              if (el) {
                  el.remove();
                  el = t.el = null;
              }
          }
  
  
          function renderSection(position) {
              var sectionEl = $('<div class="fc-' + position + '"/>');
              var buttonStr = toolbarOptions.layout[position];
  
              if (buttonStr) {
                  $.each(buttonStr.split(' '), function (i) {
                      var groupChildren = $();
                      var isOnlyButtons = true;
                      var groupEl;
  
                      $.each(this.split(','), function (j, buttonName) {
                          var customButtonProps;
                          var viewSpec;
                          var buttonClick;
                          var overrideText; // text explicitly set by calendar's constructor options. overcomes icons
                          var defaultText;
                          var themeIcon;
                          var normalIcon;
                          var innerHtml;
                          var classes;
                          var button; // the element
  
                          if (buttonName == 'title') {
                              groupChildren = groupChildren.add($('<h2>&nbsp;</h2>')); // we always want it to take up height
                              isOnlyButtons = false;
                          }
                          else {
                              if ((customButtonProps = (calendar.options.customButtons || {})[buttonName])) {
                                  buttonClick = function (ev) {
                                      if (customButtonProps.click) {
                                          customButtonProps.click.call(button[0], ev);
                                      }
                                  };
                                  overrideText = ''; // icons will override text
                                  defaultText = customButtonProps.text;
                              }
                              else if ((viewSpec = calendar.getViewSpec(buttonName))) {
                                  buttonClick = function () {
                                      calendar.changeView(buttonName);
                                  };
                                  viewsWithButtons.push(buttonName);
                                  overrideText = viewSpec.buttonTextOverride;
                                  defaultText = viewSpec.buttonTextDefault;
                              }
                              else if (calendar[buttonName]) { // a calendar method
                                  buttonClick = function () {
                                      calendar[buttonName]();
                                  };
                                  overrideText = (calendar.overrides.buttonText || {})[buttonName];
                                  defaultText = calendar.options.buttonText[buttonName]; // everything else is considered default
                              }
  
                              if (buttonClick) {
  
                                  themeIcon =
                                      customButtonProps ?
                                          customButtonProps.themeIcon :
                                          calendar.options.themeButtonIcons[buttonName];
  
                                  normalIcon =
                                      customButtonProps ?
                                          customButtonProps.icon :
                                          calendar.options.buttonIcons[buttonName];
  
                                  if (overrideText) {
                                      innerHtml = htmlEscape(overrideText);
                                  }
                                  else if (themeIcon && calendar.options.theme) {
                                      innerHtml = "<span class='ui-icon ui-icon-" + themeIcon + "'></span>";
                                  }
                                  else if (normalIcon && !calendar.options.theme) {
                                      innerHtml = "<span class='fc-icon fc-icon-" + normalIcon + "'></span>";
                                  }
                                  else {
                                      innerHtml = htmlEscape(defaultText);
                                  }
  
                                  classes = [
                                      'fc-' + buttonName + '-button',
                                      tm + '-button',
                                      tm + '-state-default'
                                  ];
  
                                  button = $( // type="button" so that it doesn't submit a form
                                      '<button type="button" class="' + classes.join(' ') + '">' +
                                      innerHtml +
                                      '</button>'
                                  )
                                      .click(function (ev) {
                                          // don't process clicks for disabled buttons
                                          if (!button.hasClass(tm + '-state-disabled')) {
  
                                              buttonClick(ev);
  
                                              // after the click action, if the button becomes the "active" tab, or disabled,
                                              // it should never have a hover class, so remove it now.
                                              if (
                                                  button.hasClass(tm + '-state-active') ||
                                                  button.hasClass(tm + '-state-disabled')
                                              ) {
                                                  button.removeClass(tm + '-state-hover');
                                              }
                                          }
                                      })
                                      .mousedown(function () {
                                          // the *down* effect (mouse pressed in).
                                          // only on buttons that are not the "active" tab, or disabled
                                          button
                                              .not('.' + tm + '-state-active')
                                              .not('.' + tm + '-state-disabled')
                                              .addClass(tm + '-state-down');
                                      })
                                      .mouseup(function () {
                                          // undo the *down* effect
                                          button.removeClass(tm + '-state-down');
                                      })
                                      .hover(
                                          function () {
                                              // the *hover* effect.
                                              // only on buttons that are not the "active" tab, or disabled
                                              button
                                                  .not('.' + tm + '-state-active')
                                                  .not('.' + tm + '-state-disabled')
                                                  .addClass(tm + '-state-hover');
                                          },
                                          function () {
                                              // undo the *hover* effect
                                              button
                                                  .removeClass(tm + '-state-hover')
                                                  .removeClass(tm + '-state-down'); // if mouseleave happens before mouseup
                                          }
                                      );
  
                                  groupChildren = groupChildren.add(button);
                              }
                          }
                      });
  
                      if (isOnlyButtons) {
                          groupChildren
                              .first().addClass(tm + '-corner-left').end()
                              .last().addClass(tm + '-corner-right').end();
                      }
  
                      if (groupChildren.length > 1) {
                          groupEl = $('<div/>');
                          if (isOnlyButtons) {
                              groupEl.addClass('fc-button-group');
                          }
                          groupEl.append(groupChildren);
                          sectionEl.append(groupEl);
                      }
                      else {
                          sectionEl.append(groupChildren); // 1 or 0 children
                      }
                  });
              }
  
              return sectionEl;
          }
  
  
          function updateTitle(text) {
              if (el) {
                  el.find('h2').text(text);
              }
          }
  
  
          function activateButton(buttonName) {
              if (el) {
                  el.find('.fc-' + buttonName + '-button')
                      .addClass(tm + '-state-active');
              }
          }
  
  
          function deactivateButton(buttonName) {
              if (el) {
                  el.find('.fc-' + buttonName + '-button')
                      .removeClass(tm + '-state-active');
              }
          }
  
  
          function disableButton(buttonName) {
              if (el) {
                  el.find('.fc-' + buttonName + '-button')
                      .prop('disabled', true)
                      .addClass(tm + '-state-disabled');
              }
          }
  
  
          function enableButton(buttonName) {
              if (el) {
                  el.find('.fc-' + buttonName + '-button')
                      .prop('disabled', false)
                      .removeClass(tm + '-state-disabled');
              }
          }
  
  
          function getViewsWithButtons() {
              return viewsWithButtons;
          }
  
      }
  
      ;
      ;
  
      var Calendar = FC.Calendar = Class.extend({
  
          dirDefaults: null, // option defaults related to LTR or RTL
          localeDefaults: null, // option defaults related to current locale
          overrides: null, // option overrides given to the fullCalendar constructor
          dynamicOverrides: null, // options set with dynamic setter method. higher precedence than view overrides.
          options: null, // all defaults combined with overrides
          viewSpecCache: null, // cache of view definitions
          view: null, // current View object
          header: null,
          footer: null,
          loadingLevel: 0, // number of simultaneous loading tasks
  
  
          // a lot of this class' OOP logic is scoped within this constructor function,
          // but in the future, write individual methods on the prototype.
          constructor: Calendar_constructor,
  
  
          // Subclasses can override this for initialization logic after the constructor has been called
          initialize: function () {
          },
  
  
          // Computes the flattened options hash for the calendar and assigns to `this.options`.
          // Assumes this.overrides and this.dynamicOverrides have already been initialized.
          populateOptionsHash: function () {
              var locale, localeDefaults;
              var isRTL, dirDefaults;
  
              locale = firstDefined( // explicit locale option given?
                  this.dynamicOverrides.locale,
                  this.overrides.locale
              );
              localeDefaults = localeOptionHash[locale];
              if (!localeDefaults) { // explicit locale option not given or invalid?
                  locale = Calendar.defaults.locale;
                  localeDefaults = localeOptionHash[locale] || {};
              }
  
              isRTL = firstDefined( // based on options computed so far, is direction RTL?
                  this.dynamicOverrides.isRTL,
                  this.overrides.isRTL,
                  localeDefaults.isRTL,
                  Calendar.defaults.isRTL
              );
              dirDefaults = isRTL ? Calendar.rtlDefaults : {};
  
              this.dirDefaults = dirDefaults;
              this.localeDefaults = localeDefaults;
              this.options = mergeOptions([ // merge defaults and overrides. lowest to highest precedence
                  Calendar.defaults, // global defaults
                  dirDefaults,
                  localeDefaults,
                  this.overrides,
                  this.dynamicOverrides
              ]);
              populateInstanceComputableOptions(this.options); // fill in gaps with computed options
          },
  
  
          // Gets information about how to create a view. Will use a cache.
          getViewSpec: function (viewType) {
              var cache = this.viewSpecCache;
  
              return cache[viewType] || (cache[viewType] = this.buildViewSpec(viewType));
          },
  
  
          // Given a duration singular unit, like "week" or "day", finds a matching view spec.
          // Preference is given to views that have corresponding buttons.
          getUnitViewSpec: function (unit) {
              var viewTypes;
              var i;
              var spec;
  
              if ($.inArray(unit, intervalUnits) != -1) {
  
                  // put views that have buttons first. there will be duplicates, but oh well
                  viewTypes = this.header.getViewsWithButtons(); // TODO: include footer as well?
                  $.each(FC.views, function (viewType) { // all views
                      viewTypes.push(viewType);
                  });
  
                  for (i = 0; i < viewTypes.length; i++) {
                      spec = this.getViewSpec(viewTypes[i]);
                      if (spec) {
                          if (spec.singleUnit == unit) {
                              return spec;
                          }
                      }
                  }
              }
          },
  
  
          // Builds an object with information on how to create a given view
          buildViewSpec: function (requestedViewType) {
              var viewOverrides = this.overrides.views || {};
              var specChain = []; // for the view. lowest to highest priority
              var defaultsChain = []; // for the view. lowest to highest priority
              var overridesChain = []; // for the view. lowest to highest priority
              var viewType = requestedViewType;
              var spec; // for the view
              var overrides; // for the view
              var duration;
              var unit;
  
              // iterate from the specific view definition to a more general one until we hit an actual View class
              while (viewType) {
                  spec = fcViews[viewType];
                  overrides = viewOverrides[viewType];
                  viewType = null; // clear. might repopulate for another iteration
  
                  if (typeof spec === 'function') { // TODO: deprecate
                      spec = {'class': spec};
                  }
  
                  if (spec) {
                      specChain.unshift(spec);
                      defaultsChain.unshift(spec.defaults || {});
                      duration = duration || spec.duration;
                      viewType = viewType || spec.type;
                  }
  
                  if (overrides) {
                      overridesChain.unshift(overrides); // view-specific option hashes have options at zero-level
                      duration = duration || overrides.duration;
                      viewType = viewType || overrides.type;
                  }
              }
  
              spec = mergeProps(specChain);
              spec.type = requestedViewType;
              if (!spec['class']) {
                  return false;
              }
  
              if (duration) {
                  duration = moment.duration(duration);
                  if (duration.valueOf()) { // valid?
                      spec.duration = duration;
                      unit = computeIntervalUnit(duration);
  
                      // view is a single-unit duration, like "week" or "day"
                      // incorporate options for this. lowest priority
                      if (duration.as(unit) === 1) {
                          spec.singleUnit = unit;
                          overridesChain.unshift(viewOverrides[unit] || {});
                      }
                  }
              }
  
              spec.defaults = mergeOptions(defaultsChain);
              spec.overrides = mergeOptions(overridesChain);
  
              this.buildViewSpecOptions(spec);
              this.buildViewSpecButtonText(spec, requestedViewType);
  
              return spec;
          },
  
  
          // Builds and assigns a view spec's options object from its already-assigned defaults and overrides
          buildViewSpecOptions: function (spec) {
              spec.options = mergeOptions([ // lowest to highest priority
                  Calendar.defaults, // global defaults
                  spec.defaults, // view's defaults (from ViewSubclass.defaults)
                  this.dirDefaults,
                  this.localeDefaults, // locale and dir take precedence over view's defaults!
                  this.overrides, // calendar's overrides (options given to constructor)
                  spec.overrides, // view's overrides (view-specific options)
                  this.dynamicOverrides // dynamically set via setter. highest precedence
              ]);
              populateInstanceComputableOptions(spec.options);
          },
  
  
          // Computes and assigns a view spec's buttonText-related options
          buildViewSpecButtonText: function (spec, requestedViewType) {
  
              // given an options object with a possible `buttonText` hash, lookup the buttonText for the
              // requested view, falling back to a generic unit entry like "week" or "day"
              function queryButtonText(options) {
                  var buttonText = options.buttonText || {};
                  return buttonText[requestedViewType] ||
                      // view can decide to look up a certain key
                      (spec.buttonTextKey ? buttonText[spec.buttonTextKey] : null) ||
                      // a key like "month"
                      (spec.singleUnit ? buttonText[spec.singleUnit] : null);
              }
  
              // highest to lowest priority
              spec.buttonTextOverride =
                  queryButtonText(this.dynamicOverrides) ||
                  queryButtonText(this.overrides) || // constructor-specified buttonText lookup hash takes precedence
                  spec.overrides.buttonText; // `buttonText` for view-specific options is a string
  
              // highest to lowest priority. mirrors buildViewSpecOptions
              spec.buttonTextDefault =
                  queryButtonText(this.localeDefaults) ||
                  queryButtonText(this.dirDefaults) ||
                  spec.defaults.buttonText || // a single string. from ViewSubclass.defaults
                  queryButtonText(Calendar.defaults) ||
                  (spec.duration ? this.humanizeDuration(spec.duration) : null) || // like "3 days"
                  requestedViewType; // fall back to given view name
          },
  
  
          // Given a view name for a custom view or a standard view, creates a ready-to-go View object
          instantiateView: function (viewType) {
              var spec = this.getViewSpec(viewType);
  
              return new spec['class'](this, viewType, spec.options, spec.duration);
          },
  
  
          // Returns a boolean about whether the view is okay to instantiate at some point
          isValidViewType: function (viewType) {
              return Boolean(this.getViewSpec(viewType));
          },
  
  
          // Should be called when any type of async data fetching begins
          pushLoading: function () {
              if (!(this.loadingLevel++)) {
                  this.publiclyTrigger('loading', null, true, this.view);
              }
          },
  
  
          // Should be called when any type of async data fetching completes
          popLoading: function () {
              if (!(--this.loadingLevel)) {
                  this.publiclyTrigger('loading', null, false, this.view);
              }
          },
  
  
          // Given arguments to the select method in the API, returns a span (unzoned start/end and other info)
          buildSelectSpan: function (zonedStartInput, zonedEndInput) {
              var start = this.moment(zonedStartInput).stripZone();
              var end;
  
              if (zonedEndInput) {
                  end = this.moment(zonedEndInput).stripZone();
              }
              else if (start.hasTime()) {
                  end = start.clone().add(this.defaultTimedEventDuration);
              }
              else {
                  end = start.clone().add(this.defaultAllDayEventDuration);
              }
  
              return {start: start, end: end};
          }
  
      });
  
  
      Calendar.mixin(EmitterMixin);
  
  
      function Calendar_constructor(element, overrides) {
          var t = this;
  
          // declare the current calendar instance relies on GlobalEmitter. needed for garbage collection.
          GlobalEmitter.needed();
  
  
          // Exports
          // -----------------------------------------------------------------------------------
  
          t.render = render;
          t.destroy = destroy;
          t.rerenderEvents = rerenderEvents;
          t.changeView = renderView; // `renderView` will switch to another view
          t.select = select;
          t.unselect = unselect;
          t.prev = prev;
          t.next = next;
          t.prevYear = prevYear;
          t.nextYear = nextYear;
          t.today = today;
          t.gotoDate = gotoDate;
          t.incrementDate = incrementDate;
          t.zoomTo = zoomTo;
          t.getDate = getDate;
          t.getCalendar = getCalendar;
          t.getView = getView;
          t.option = option; // getter/setter method
          t.publiclyTrigger = publiclyTrigger;
  
  
          // Options
          // -----------------------------------------------------------------------------------
  
          t.dynamicOverrides = {};
          t.viewSpecCache = {};
          t.optionHandlers = {}; // for Calendar.options.js
          t.overrides = $.extend({}, overrides); // make a copy
  
          t.populateOptionsHash(); // sets this.options
  
  
          // Locale-data Internals
          // -----------------------------------------------------------------------------------
          // Apply overrides to the current locale's data
  
          var localeData;
  
          // Called immediately, and when any of the options change.
          // Happens before any internal objects rebuild or rerender, because this is very core.
          t.bindOptions([
              'locale', 'monthNames', 'monthNamesShort', 'dayNames', 'dayNamesShort', 'firstDay', 'weekNumberCalculation'
          ], function (locale, monthNames, monthNamesShort, dayNames, dayNamesShort, firstDay, weekNumberCalculation) {
  
              // normalize
              if (weekNumberCalculation === 'iso') {
                  weekNumberCalculation = 'ISO'; // normalize
              }
  
              localeData = createObject( // make a cheap copy
                  getMomentLocaleData(locale) // will fall back to en
              );
  
              if (monthNames) {
                  localeData._months = monthNames;
              }
              if (monthNamesShort) {
                  localeData._monthsShort = monthNamesShort;
              }
              if (dayNames) {
                  localeData._weekdays = dayNames;
              }
              if (dayNamesShort) {
                  localeData._weekdaysShort = dayNamesShort;
              }
  
              if (firstDay == null && weekNumberCalculation === 'ISO') {
                  firstDay = 1;
              }
              if (firstDay != null) {
                  var _week = createObject(localeData._week); // _week: { dow: # }
                  _week.dow = firstDay;
                  localeData._week = _week;
              }
  
              if ( // whitelist certain kinds of input
                  weekNumberCalculation === 'ISO' ||
                  weekNumberCalculation === 'local' ||
                  typeof weekNumberCalculation === 'function'
              ) {
                  localeData._fullCalendar_weekCalc = weekNumberCalculation; // moment-ext will know what to do with it
              }
  
              // If the internal current date object already exists, move to new locale.
              // We do NOT need to do this technique for event dates, because this happens when converting to "segments".
              if (date) {
                  localizeMoment(date); // sets to localeData
              }
          });
  
  
          // Calendar-specific Date Utilities
          // -----------------------------------------------------------------------------------
  
  
          t.defaultAllDayEventDuration = moment.duration(t.options.defaultAllDayEventDuration);
          t.defaultTimedEventDuration = moment.duration(t.options.defaultTimedEventDuration);
  
  
          // Builds a moment using the settings of the current calendar: timezone and locale.
          // Accepts anything the vanilla moment() constructor accepts.
          t.moment = function () {
              var mom;
  
              if (t.options.timezone === 'local') {
                  mom = FC.moment.apply(null, arguments);
  
                  // Force the moment to be local, because FC.moment doesn't guarantee it.
                  if (mom.hasTime()) { // don't give ambiguously-timed moments a local zone
                      mom.local();
                  }
              }
              else if (t.options.timezone === 'UTC') {
                  mom = FC.moment.utc.apply(null, arguments); // process as UTC
              }
              else {
                  mom = FC.moment.parseZone.apply(null, arguments); // let the input decide the zone
              }
  
              localizeMoment(mom);
  
              return mom;
          };
  
  
          // Updates the given moment's locale settings to the current calendar locale settings.
          function localizeMoment(mom) {
              mom._locale = localeData;
          }
  
          t.localizeMoment = localizeMoment;
  
  
          // Returns a boolean about whether or not the calendar knows how to calculate
          // the timezone offset of arbitrary dates in the current timezone.
          t.getIsAmbigTimezone = function () {
              return t.options.timezone !== 'local' && t.options.timezone !== 'UTC';
          };
  
  
          // Returns a copy of the given date in the current timezone. Has no effect on dates without times.
          t.applyTimezone = function (date) {
              if (!date.hasTime()) {
                  return date.clone();
              }
  
              var zonedDate = t.moment(date.toArray());
              var timeAdjust = date.time() - zonedDate.time();
              var adjustedZonedDate;
  
              // Safari sometimes has problems with this coersion when near DST. Adjust if necessary. (bug #2396)
              if (timeAdjust) { // is the time result different than expected?
                  adjustedZonedDate = zonedDate.clone().add(timeAdjust); // add milliseconds
                  if (date.time() - adjustedZonedDate.time() === 0) { // does it match perfectly now?
                      zonedDate = adjustedZonedDate;
                  }
              }
  
              return zonedDate;
          };
  
  
          // Returns a moment for the current date, as defined by the client's computer or from the `now` option.
          // Will return an moment with an ambiguous timezone.
          t.getNow = function () {
              var now = t.options.now;
              if (typeof now === 'function') {
                  now = now();
              }
              return t.moment(now).stripZone();
          };
  
  
          // Get an event's normalized end date. If not present, calculate it from the defaults.
          t.getEventEnd = function (event) {
              if (event.end) {
                  return event.end.clone();
              }
              else {
                  return t.getDefaultEventEnd(event.allDay, event.start);
              }
          };
  
  
          // Given an event's allDay status and start date, return what its fallback end date should be.
          // TODO: rename to computeDefaultEventEnd
          t.getDefaultEventEnd = function (allDay, zonedStart) {
              var end = zonedStart.clone();
  
              if (allDay) {
                  end.stripTime().add(t.defaultAllDayEventDuration);
              }
              else {
                  end.add(t.defaultTimedEventDuration);
              }
  
              if (t.getIsAmbigTimezone()) {
                  end.stripZone(); // we don't know what the tzo should be
              }
  
              return end;
          };
  
  
          // Produces a human-readable string for the given duration.
          // Side-effect: changes the locale of the given duration.
          t.humanizeDuration = function (duration) {
              return duration.locale(t.options.locale).humanize();
          };
  
  
          // Imports
          // -----------------------------------------------------------------------------------
  
  
          EventManager.call(t);
  
  
          // Locals
          // -----------------------------------------------------------------------------------
  
  
          var _element = element[0];
          var toolbarsManager;
          var header;
          var footer;
          var content;
          var tm; // for making theme classes
          var currentView; // NOTE: keep this in sync with this.view
          var viewsByType = {}; // holds all instantiated view instances, current or not
          var suggestedViewHeight;
          var windowResizeProxy; // wraps the windowResize function
          var ignoreWindowResize = 0;
          var date; // unzoned
  
  
          // Main Rendering
          // -----------------------------------------------------------------------------------
  
  
          // compute the initial ambig-timezone date
          if (t.options.defaultDate != null) {
              date = t.moment(t.options.defaultDate).stripZone();
          }
          else {
              date = t.getNow(); // getNow already returns unzoned
          }
  
  
          function render() {
              if (!content) {
                  initialRender();
              }
              else if (elementVisible()) {
                  // mainly for the public API
                  calcSize();
                  renderView();
              }
          }
  
  
          function initialRender() {
              element.addClass('fc');
  
              // event delegation for nav links
              element.on('click.fc', 'a[data-goto]', function (ev) {
                  var anchorEl = $(this);
                  var gotoOptions = anchorEl.data('goto'); // will automatically parse JSON
                  var date = t.moment(gotoOptions.date);
                  var viewType = gotoOptions.type;
  
                  // property like "navLinkDayClick". might be a string or a function
                  var customAction = currentView.opt('navLink' + capitaliseFirstLetter(viewType) + 'Click');
  
                  if (typeof customAction === 'function') {
                      customAction(date, ev);
                  }
                  else {
                      if (typeof customAction === 'string') {
                          viewType = customAction;
                      }
                      zoomTo(date, viewType);
                  }
              });
  
              // called immediately, and upon option change
              t.bindOption('theme', function (theme) {
                  tm = theme ? 'ui' : 'fc'; // affects a larger scope
                  element.toggleClass('ui-widget', theme);
                  element.toggleClass('fc-unthemed', !theme);
              });
  
              // called immediately, and upon option change.
              // HACK: locale often affects isRTL, so we explicitly listen to that too.
              t.bindOptions(['isRTL', 'locale'], function (isRTL) {
                  element.toggleClass('fc-ltr', !isRTL);
                  element.toggleClass('fc-rtl', isRTL);
              });
  
              content = $("<div class='fc-view-container'/>").prependTo(element);
  
              var toolbars = buildToolbars();
              toolbarsManager = new Iterator(toolbars);
  
              header = t.header = toolbars[0];
              footer = t.footer = toolbars[1];
  
              renderHeader();
              renderFooter();
              renderView(t.options.defaultView);
  
              if (t.options.handleWindowResize) {
                  windowResizeProxy = debounce(windowResize, t.options.windowResizeDelay); // prevents rapid calls
                  $(window).resize(windowResizeProxy);
              }
          }
  
  
          function destroy() {
  
              if (currentView) {
                  currentView.removeElement();
  
                  // NOTE: don't null-out currentView/t.view in case API methods are called after destroy.
                  // It is still the "current" view, just not rendered.
              }
  
              toolbarsManager.proxyCall('removeElement');
              content.remove();
              element.removeClass('fc fc-ltr fc-rtl fc-unthemed ui-widget');
  
              element.off('.fc'); // unbind nav link handlers
  
              if (windowResizeProxy) {
                  $(window).unbind('resize', windowResizeProxy);
              }
  
              GlobalEmitter.unneeded();
          }
  
  
          function elementVisible() {
              return element.is(':visible');
          }
  
  
          // View Rendering
          // -----------------------------------------------------------------------------------
  
  
          // Renders a view because of a date change, view-type change, or for the first time.
          // If not given a viewType, keep the current view but render different dates.
          // Accepts an optional scroll state to restore to.
          function renderView(viewType, forcedScroll) {
              ignoreWindowResize++;
  
              var needsClearView = currentView && viewType && currentView.type !== viewType;
  
              // if viewType is changing, remove the old view's rendering
              if (needsClearView) {
                  freezeContentHeight(); // prevent a scroll jump when view element is removed
                  clearView();
              }
  
              // if viewType changed, or the view was never created, create a fresh view
              if (!currentView && viewType) {
                  currentView = t.view =
                      viewsByType[viewType] ||
                      (viewsByType[viewType] = t.instantiateView(viewType));
  
                  currentView.setElement(
                      $("<div class='fc-view fc-" + viewType + "-view' />").appendTo(content)
                  );
                  toolbarsManager.proxyCall('activateButton', viewType);
              }
  
              if (currentView) {
  
                  // in case the view should render a period of time that is completely hidden
                  date = currentView.massageCurrentDate(date);
  
                  // render or rerender the view
                  if (
                      !currentView.isDateSet ||
                      !( // NOT within interval range signals an implicit date window change
                          date >= currentView.intervalStart &&
                          date < currentView.intervalEnd
                      )
                  ) {
                      if (elementVisible()) {
  
                          if (forcedScroll) {
                              currentView.captureInitialScroll(forcedScroll);
                          }
  
                          currentView.setDate(date, forcedScroll);
  
                          if (forcedScroll) {
                              currentView.releaseScroll();
                          }
  
                          // need to do this after View::render, so dates are calculated
                          // NOTE: view updates title text proactively
                          updateToolbarsTodayButton();
                      }
                  }
              }
  
              if (needsClearView) {
                  thawContentHeight();
              }
  
              ignoreWindowResize--;
          }
  
  
          // Unrenders the current view and reflects this change in the Header.
          // Unregsiters the `currentView`, but does not remove from viewByType hash.
          function clearView() {
              toolbarsManager.proxyCall('deactivateButton', currentView.type);
              currentView.removeElement();
              currentView = t.view = null;
          }
  
  
          // Destroys the view, including the view object. Then, re-instantiates it and renders it.
          // Maintains the same scroll state.
          // TODO: maintain any other user-manipulated state.
          function reinitView() {
              ignoreWindowResize++;
              freezeContentHeight();
  
              var viewType = currentView.type;
              var scrollState = currentView.queryScroll();
              clearView();
              calcSize();
              renderView(viewType, scrollState);
  
              thawContentHeight();
              ignoreWindowResize--;
          }
  
  
          // Resizing
          // -----------------------------------------------------------------------------------
  
  
          t.getSuggestedViewHeight = function () {
              if (suggestedViewHeight === undefined) {
                  calcSize();
              }
              return suggestedViewHeight;
          };
  
  
          t.isHeightAuto = function () {
              return t.options.contentHeight === 'auto' || t.options.height === 'auto';
          };
  
  
          function updateSize(shouldRecalc) {
              if (elementVisible()) {
  
                  if (shouldRecalc) {
                      _calcSize();
                  }
  
                  ignoreWindowResize++;
                  currentView.updateSize(true); // isResize=true. will poll getSuggestedViewHeight() and isHeightAuto()
                  ignoreWindowResize--;
  
                  return true; // signal success
              }
          }
  
  
          function calcSize() {
              if (elementVisible()) {
                  _calcSize();
              }
          }
  
  
          function _calcSize() { // assumes elementVisible
              var contentHeightInput = t.options.contentHeight;
              var heightInput = t.options.height;
  
              if (typeof contentHeightInput === 'number') { // exists and not 'auto'
                  suggestedViewHeight = contentHeightInput;
              }
              else if (typeof contentHeightInput === 'function') { // exists and is a function
                  suggestedViewHeight = contentHeightInput();
              }
              else if (typeof heightInput === 'number') { // exists and not 'auto'
                  suggestedViewHeight = heightInput - queryToolbarsHeight();
              }
              else if (typeof heightInput === 'function') { // exists and is a function
                  suggestedViewHeight = heightInput() - queryToolbarsHeight();
              }
              else if (heightInput === 'parent') { // set to height of parent element
                  suggestedViewHeight = element.parent().height() - queryToolbarsHeight();
              }
              else {
                  suggestedViewHeight = Math.round(content.width() / Math.max(t.options.aspectRatio, .5));
              }
          }
  
  
          function queryToolbarsHeight() {
              return toolbarsManager.items.reduce(function (accumulator, toolbar) {
                  var toolbarHeight = toolbar.el ? toolbar.el.outerHeight(true) : 0; // includes margin
                  return accumulator + toolbarHeight;
              }, 0);
          }
  
  
          function windowResize(ev) {
              if (
                  !ignoreWindowResize &&
                  ev.target === window && // so we don't process jqui "resize" events that have bubbled up
                  currentView.start // view has already been rendered
              ) {
                  if (updateSize(true)) {
                      currentView.publiclyTrigger('windowResize', _element);
                  }
              }
          }
  
  
          /* Event Rendering
  	-----------------------------------------------------------------------------*/
  
  
          function rerenderEvents() { // API method. destroys old events if previously rendered.
              if (elementVisible()) {
                  t.reportEventChange(); // will re-trasmit events to the view, causing a rerender
              }
          }
  
  
          /* Toolbars
  	-----------------------------------------------------------------------------*/
  
  
          function buildToolbars() {
              return [
                  new Toolbar(t, computeHeaderOptions()),
                  new Toolbar(t, computeFooterOptions())
              ];
          }
  
  
          function computeHeaderOptions() {
              return {
                  extraClasses: 'fc-header-toolbar',
                  layout: t.options.header
              };
          }
  
  
          function computeFooterOptions() {
              return {
                  extraClasses: 'fc-footer-toolbar',
                  layout: t.options.footer
              };
          }
  
  
          // can be called repeatedly and Header will rerender
          function renderHeader() {
              header.setToolbarOptions(computeHeaderOptions());
              header.render();
              if (header.el) {
                  element.prepend(header.el);
              }
          }
  
  
          // can be called repeatedly and Footer will rerender
          function renderFooter() {
              footer.setToolbarOptions(computeFooterOptions());
              footer.render();
              if (footer.el) {
                  element.append(footer.el);
              }
          }
  
  
          t.setToolbarsTitle = function (title) {
              toolbarsManager.proxyCall('updateTitle', title);
          };
  
  
          function updateToolbarsTodayButton() {
              var now = t.getNow();
              if (now >= currentView.intervalStart && now < currentView.intervalEnd) {
                  toolbarsManager.proxyCall('disableButton', 'today');
              }
              else {
                  toolbarsManager.proxyCall('enableButton', 'today');
              }
          }
  
  
          /* Selection
  	-----------------------------------------------------------------------------*/
  
  
          // this public method receives start/end dates in any format, with any timezone
          function select(zonedStartInput, zonedEndInput) {
              currentView.select(
                  t.buildSelectSpan.apply(t, arguments)
              );
          }
  
  
          function unselect() { // safe to be called before renderView
              if (currentView) {
                  currentView.unselect();
              }
          }
  
  
          /* Date
  	-----------------------------------------------------------------------------*/
  
  
          function prev() {
              date = currentView.computePrevDate(date);
              renderView();
          }
  
  
          function next() {
              date = currentView.computeNextDate(date);
              renderView();
          }
  
  
          function prevYear() {
              date.add(-1, 'years');
              renderView();
          }
  
  
          function nextYear() {
              date.add(1, 'years');
              renderView();
          }
  
  
          function today() {
              date = t.getNow();
              renderView();
          }
  
  
          function gotoDate(zonedDateInput) {
              date = t.moment(zonedDateInput).stripZone();
              renderView();
          }
  
  
          function incrementDate(delta) {
              date.add(moment.duration(delta));
              renderView();
          }
  
  
          // Forces navigation to a view for the given date.
          // `viewType` can be a specific view name or a generic one like "week" or "day".
          function zoomTo(newDate, viewType) {
              var spec;
  
              viewType = viewType || 'day'; // day is default zoom
              spec = t.getViewSpec(viewType) || t.getUnitViewSpec(viewType);
  
              date = newDate.clone();
              renderView(spec ? spec.type : null);
          }
  
  
          // for external API
          function getDate() {
              return t.applyTimezone(date); // infuse the calendar's timezone
          }
  
  
          /* Height "Freezing"
  	-----------------------------------------------------------------------------*/
  
  
          t.freezeContentHeight = freezeContentHeight;
          t.thawContentHeight = thawContentHeight;
  
          var freezeContentHeightDepth = 0;
  
  
          function freezeContentHeight() {
              if (!(freezeContentHeightDepth++)) {
                  content.css({
                      width: '100%',
                      height: content.height(),
                      overflow: 'hidden'
                  });
              }
          }
  
  
          function thawContentHeight() {
              if (!(--freezeContentHeightDepth)) {
                  content.css({
                      width: '',
                      height: '',
                      overflow: ''
                  });
              }
          }
  
  
          /* Misc
  	-----------------------------------------------------------------------------*/
  
  
          function getCalendar() {
              return t;
          }
  
  
          function getView() {
              return currentView;
          }
  
  
          function option(name, value) {
              var newOptionHash;
  
              if (typeof name === 'string') {
                  if (value === undefined) { // getter
                      return t.options[name];
                  }
                  else { // setter for individual option
                      newOptionHash = {};
                      newOptionHash[name] = value;
                      setOptions(newOptionHash);
                  }
              }
              else if (typeof name === 'object') { // compound setter with object input
                  setOptions(name);
              }
          }
  
  
          function setOptions(newOptionHash) {
              var optionCnt = 0;
              var optionName;
  
              for (optionName in newOptionHash) {
                  t.dynamicOverrides[optionName] = newOptionHash[optionName];
              }
  
              t.viewSpecCache = {}; // the dynamic override invalidates the options in this cache, so just clear it
              t.populateOptionsHash(); // this.options needs to be recomputed after the dynamic override
  
              // trigger handlers after this.options has been updated
              for (optionName in newOptionHash) {
                  t.triggerOptionHandlers(optionName); // recall bindOption/bindOptions
                  optionCnt++;
              }
  
              // special-case handling of single option change.
              // if only one option change, `optionName` will be its name.
              if (optionCnt === 1) {
                  if (optionName === 'height' || optionName === 'contentHeight' || optionName === 'aspectRatio') {
                      updateSize(true); // true = allow recalculation of height
                      return;
                  }
                  else if (optionName === 'defaultDate') {
                      return; // can't change date this way. use gotoDate instead
                  }
                  else if (optionName === 'businessHours') {
                      if (currentView) {
                          currentView.unrenderBusinessHours();
                          currentView.renderBusinessHours();
                      }
                      return;
                  }
                  else if (optionName === 'timezone') {
                      t.rezoneArrayEventSources();
                      t.refetchEvents();
                      return;
                  }
              }
  
              // catch-all. rerender the header and footer and rebuild/rerender the current view
              renderHeader();
              renderFooter();
              viewsByType = {}; // even non-current views will be affected by this option change. do before rerender
              reinitView();
          }
  
  
          function publiclyTrigger(name, thisObj) {
              var args = Array.prototype.slice.call(arguments, 2);
  
              thisObj = thisObj || _element;
              this.triggerWith(name, thisObj, args); // Emitter's method
  
              if (t.options[name]) {
                  return t.options[name].apply(thisObj, args);
              }
          }
  
          t.initialize();
      }
  
      ;
      ;
      /*
  Options binding/triggering system.
  */
      Calendar.mixin({
  
          // A map of option names to arrays of handler objects. Initialized to {} in Calendar.
          // Format for a handler object:
          // {
          //   func // callback function to be called upon change
          //   names // option names whose values should be given to func
          // }
          optionHandlers: null,
  
          // Calls handlerFunc immediately, and when the given option has changed.
          // handlerFunc will be given the option value.
          bindOption: function (optionName, handlerFunc) {
              this.bindOptions([optionName], handlerFunc);
          },
  
          // Calls handlerFunc immediately, and when any of the given options change.
          // handlerFunc will be given each option value as ordered function arguments.
          bindOptions: function (optionNames, handlerFunc) {
              var handlerObj = {func: handlerFunc, names: optionNames};
              var i;
  
              for (i = 0; i < optionNames.length; i++) {
                  this.registerOptionHandlerObj(optionNames[i], handlerObj);
              }
  
              this.triggerOptionHandlerObj(handlerObj);
          },
  
          // Puts the given handler object into the internal hash
          registerOptionHandlerObj: function (optionName, handlerObj) {
              (this.optionHandlers[optionName] || (this.optionHandlers[optionName] = []))
                  .push(handlerObj);
          },
  
          // Reports that the given option has changed, and calls all appropriate handlers.
          triggerOptionHandlers: function (optionName) {
              var handlerObjs = this.optionHandlers[optionName] || [];
              var i;
  
              for (i = 0; i < handlerObjs.length; i++) {
                  this.triggerOptionHandlerObj(handlerObjs[i]);
              }
          },
  
          // Calls the callback for a specific handler object, passing in the appropriate arguments.
          triggerOptionHandlerObj: function (handlerObj) {
              var optionNames = handlerObj.names;
              var optionValues = [];
              var i;
  
              for (i = 0; i < optionNames.length; i++) {
                  optionValues.push(this.options[optionNames[i]]);
              }
  
              handlerObj.func.apply(this, optionValues); // maintain the Calendar's `this` context
          }
  
      });
  
      ;
      ;
  
      Calendar.defaults = {
  
          titleRangeSeparator: ' \u2013 ', // en dash
          monthYearFormat: 'MMMM YYYY', // required for en. other locales rely on datepicker computable option
  
          defaultTimedEventDuration: '02:00:00',
          defaultAllDayEventDuration: {days: 1},
          forceEventDuration: false,
          nextDayThreshold: '09:00:00', // 9am
  
          // display
          defaultView: 'month',
          aspectRatio: 1.35,
          header: {
              left: 'title',
              center: '',
              right: 'today prev,next'
          },
          weekends: true,
          weekNumbers: false,
  
          weekNumberTitle: 'W',
          weekNumberCalculation: 'local',
  
          //editable: false,
  
          //nowIndicator: false,
  
          scrollTime: '06:00:00',
  
          // event ajax
          lazyFetching: true,
          startParam: 'start',
          endParam: 'end',
          timezoneParam: 'timezone',
  
          timezone: false,
  
          //allDayDefault: undefined,
  
          // locale
          isRTL: false,
          buttonText: {
              prev: "prev",
              next: "next",
              prevYear: "prev year",
              nextYear: "next year",
              year: 'year', // TODO: locale files need to specify this
              today: 'today',
              month: 'month',
              week: 'week',
              day: 'day'
          },
  
          buttonIcons: {
              prev: 'left-single-arrow',
              next: 'right-single-arrow',
              prevYear: 'left-double-arrow',
              nextYear: 'right-double-arrow'
          },
  
          allDayText: 'all-day',
  
          // jquery-ui theming
          theme: false,
          themeButtonIcons: {
              prev: 'circle-triangle-w',
              next: 'circle-triangle-e',
              prevYear: 'seek-prev',
              nextYear: 'seek-next'
          },
  
          //eventResizableFromStart: false,
          dragOpacity: .75,
          dragRevertDuration: 500,
          dragScroll: true,
  
          //selectable: false,
          unselectAuto: true,
          //selectMinDistance: 0,
  
          dropAccept: '*',
  
          eventOrder: 'title',
          //eventRenderWait: null,
  
          eventLimit: false,
          eventLimitText: 'more',
          eventLimitClick: 'popover',
          dayPopoverFormat: 'LL',
  
          handleWindowResize: true,
          windowResizeDelay: 100, // milliseconds before an updateSize happens
  
          longPressDelay: 1000
  
      };
  
  
      Calendar.englishDefaults = { // used by locale.js
          dayPopoverFormat: 'dddd, MMMM D'
      };
  
  
      Calendar.rtlDefaults = { // right-to-left defaults
          header: { // TODO: smarter solution (first/center/last ?)
              left: 'next,prev today',
              center: '',
              right: 'title'
          },
          buttonIcons: {
              prev: 'right-single-arrow',
              next: 'left-single-arrow',
              prevYear: 'right-double-arrow',
              nextYear: 'left-double-arrow'
          },
          themeButtonIcons: {
              prev: 'circle-triangle-e',
              next: 'circle-triangle-w',
              nextYear: 'seek-prev',
              prevYear: 'seek-next'
          }
      };
  
      ;
      ;
  
      var localeOptionHash = FC.locales = {}; // initialize and expose
  
  
  // TODO: document the structure and ordering of a FullCalendar locale file
  
  
  // Initialize jQuery UI datepicker translations while using some of the translations
  // Will set this as the default locales for datepicker.
      FC.datepickerLocale = function (localeCode, dpLocaleCode, dpOptions) {
  
          // get the FullCalendar internal option hash for this locale. create if necessary
          var fcOptions = localeOptionHash[localeCode] || (localeOptionHash[localeCode] = {});
  
          // transfer some simple options from datepicker to fc
          fcOptions.isRTL = dpOptions.isRTL;
          fcOptions.weekNumberTitle = dpOptions.weekHeader;
  
          // compute some more complex options from datepicker
          $.each(dpComputableOptions, function (name, func) {
              fcOptions[name] = func(dpOptions);
          });
  
          // is jQuery UI Datepicker is on the page?
          if ($.datepicker) {
  
              // Register the locale data.
              // FullCalendar and MomentJS use locale codes like "pt-br" but Datepicker
              // does it like "pt-BR" or if it doesn't have the locale, maybe just "pt".
              // Make an alias so the locale can be referenced either way.
              $.datepicker.regional[dpLocaleCode] =
                  $.datepicker.regional[localeCode] = // alias
                      dpOptions;
  
              // Alias 'en' to the default locale data. Do this every time.
              $.datepicker.regional.en = $.datepicker.regional[''];
  
              // Set as Datepicker's global defaults.
              $.datepicker.setDefaults(dpOptions);
          }
      };
  
  
  // Sets FullCalendar-specific translations. Will set the locales as the global default.
      FC.locale = function (localeCode, newFcOptions) {
          var fcOptions;
          var momOptions;
  
          // get the FullCalendar internal option hash for this locale. create if necessary
          fcOptions = localeOptionHash[localeCode] || (localeOptionHash[localeCode] = {});
  
          // provided new options for this locales? merge them in
          if (newFcOptions) {
              fcOptions = localeOptionHash[localeCode] = mergeOptions([fcOptions, newFcOptions]);
          }
  
          // compute locale options that weren't defined.
          // always do this. newFcOptions can be undefined when initializing from i18n file,
          // so no way to tell if this is an initialization or a default-setting.
          momOptions = getMomentLocaleData(localeCode); // will fall back to en
          $.each(momComputableOptions, function (name, func) {
              if (fcOptions[name] == null) {
                  fcOptions[name] = func(momOptions, fcOptions);
              }
          });
  
          // set it as the default locale for FullCalendar
          Calendar.defaults.locale = localeCode;
      };
  
  
  // NOTE: can't guarantee any of these computations will run because not every locale has datepicker
  // configs, so make sure there are English fallbacks for these in the defaults file.
      var dpComputableOptions = {
  
          buttonText: function (dpOptions) {
              return {
                  // the translations sometimes wrongly contain HTML entities
                  prev: stripHtmlEntities(dpOptions.prevText),
                  next: stripHtmlEntities(dpOptions.nextText),
                  today: stripHtmlEntities(dpOptions.currentText)
              };
          },
  
          // Produces format strings like "MMMM YYYY" -> "September 2014"
          monthYearFormat: function (dpOptions) {
              return dpOptions.showMonthAfterYear ?
                  'YYYY[' + dpOptions.yearSuffix + '] MMMM' :
                  'MMMM YYYY[' + dpOptions.yearSuffix + ']';
          }
  
      };
  
      var momComputableOptions = {
  
          // Produces format strings like "ddd M/D" -> "Fri 9/15"
          dayOfMonthFormat: function (momOptions, fcOptions) {
              var format = momOptions.longDateFormat('l'); // for the format like "M/D/YYYY"
  
              // strip the year off the edge, as well as other misc non-whitespace chars
              format = format.replace(/^Y+[^\w\s]*|[^\w\s]*Y+$/g, '');
  
              if (fcOptions.isRTL) {
                  format += ' ddd'; // for RTL, add day-of-week to end
              }
              else {
                  format = 'ddd ' + format; // for LTR, add day-of-week to beginning
              }
              return format;
          },
  
          // Produces format strings like "h:mma" -> "6:00pm"
          mediumTimeFormat: function (momOptions) { // can't be called `timeFormat` because collides with option
              return momOptions.longDateFormat('LT')
                  .replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
          },
  
          // Produces format strings like "h(:mm)a" -> "6pm" / "6:30pm"
          smallTimeFormat: function (momOptions) {
              return momOptions.longDateFormat('LT')
                  .replace(':mm', '(:mm)')
                  .replace(/(\Wmm)$/, '($1)') // like above, but for foreign locales
                  .replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
          },
  
          // Produces format strings like "h(:mm)t" -> "6p" / "6:30p"
          extraSmallTimeFormat: function (momOptions) {
              return momOptions.longDateFormat('LT')
                  .replace(':mm', '(:mm)')
                  .replace(/(\Wmm)$/, '($1)') // like above, but for foreign locales
                  .replace(/\s*a$/i, 't'); // convert to AM/PM/am/pm to lowercase one-letter. remove any spaces beforehand
          },
  
          // Produces format strings like "ha" / "H" -> "6pm" / "18"
          hourFormat: function (momOptions) {
              return momOptions.longDateFormat('LT')
                  .replace(':mm', '')
                  .replace(/(\Wmm)$/, '') // like above, but for foreign locales
                  .replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
          },
  
          // Produces format strings like "h:mm" -> "6:30" (with no AM/PM)
          noMeridiemTimeFormat: function (momOptions) {
              return momOptions.longDateFormat('LT')
                  .replace(/\s*a$/i, ''); // remove trailing AM/PM
          }
  
      };
  
  
  // options that should be computed off live calendar options (considers override options)
  // TODO: best place for this? related to locale?
  // TODO: flipping text based on isRTL is a bad idea because the CSS `direction` might want to handle it
      var instanceComputableOptions = {
  
          // Produces format strings for results like "Mo 16"
          smallDayDateFormat: function (options) {
              return options.isRTL ?
                  'D dd' :
                  'dd D';
          },
  
          // Produces format strings for results like "Wk 5"
          weekFormat: function (options) {
              return options.isRTL ?
                  'w[ ' + options.weekNumberTitle + ']' :
                  '[' + options.weekNumberTitle + ' ]w';
          },
  
          // Produces format strings for results like "Wk5"
          smallWeekFormat: function (options) {
              return options.isRTL ?
                  'w[' + options.weekNumberTitle + ']' :
                  '[' + options.weekNumberTitle + ']w';
          }
  
      };
  
      function populateInstanceComputableOptions(options) {
          $.each(instanceComputableOptions, function (name, func) {
              if (options[name] == null) {
                  options[name] = func(options);
              }
          });
      }
  
  
  // Returns moment's internal locale data. If doesn't exist, returns English.
      function getMomentLocaleData(localeCode) {
          return moment.localeData(localeCode) || moment.localeData('en');
      }
  
  
  // Initialize English by forcing computation of moment-derived options.
  // Also, sets it as the default.
      FC.locale('en', Calendar.englishDefaults);
  
      ;
      ;
  
      FC.sourceNormalizers = [];
      FC.sourceFetchers = [];
  
      var ajaxDefaults = {
          dataType: 'json',
          cache: false
      };
  
      var eventGUID = 1;
  
  
      function EventManager() { // assumed to be a calendar
          var t = this;
  
  
          // exports
          t.requestEvents = requestEvents;
          t.reportEventChange = reportEventChange;
          t.isFetchNeeded = isFetchNeeded;
          t.fetchEvents = fetchEvents;
          t.fetchEventSources = fetchEventSources;
          t.refetchEvents = refetchEvents;
          t.refetchEventSources = refetchEventSources;
          t.getEventSources = getEventSources;
          t.getEventSourceById = getEventSourceById;
          t.addEventSource = addEventSource;
          t.removeEventSource = removeEventSource;
          t.removeEventSources = removeEventSources;
          t.updateEvent = updateEvent;
          t.updateEvents = updateEvents;
          t.renderEvent = renderEvent;
          t.renderEvents = renderEvents;
          t.removeEvents = removeEvents;
          t.clientEvents = clientEvents;
          t.mutateEvent = mutateEvent;
          t.normalizeEventDates = normalizeEventDates;
          t.normalizeEventTimes = normalizeEventTimes;
  
  
          // locals
          var stickySource = {events: []};
          var sources = [stickySource];
          var rangeStart, rangeEnd;
          var pendingSourceCnt = 0; // outstanding fetch requests, max one per source
          var cache = []; // holds events that have already been expanded
          var prunedCache; // like cache, but only events that intersect with rangeStart/rangeEnd
  
  
          $.each(
              (t.options.events ? [t.options.events] : []).concat(t.options.eventSources || []),
              function (i, sourceInput) {
                  var source = buildEventSource(sourceInput);
                  if (source) {
                      sources.push(source);
                  }
              }
          );
  
  
          function requestEvents(start, end) {
              if (!t.options.lazyFetching || isFetchNeeded(start, end)) {
                  return fetchEvents(start, end);
              }
              else {
                  return Promise.resolve(prunedCache);
              }
          }
  
  
          function reportEventChange() {
              prunedCache = filterEventsWithinRange(cache);
              t.trigger('eventsReset', prunedCache);
          }
  
  
          function filterEventsWithinRange(events) {
              var filteredEvents = [];
              var i, event;
  
              for (i = 0; i < events.length; i++) {
                  event = events[i];
  
                  if (
                      event.start.clone().stripZone() < rangeEnd &&
                      t.getEventEnd(event).stripZone() > rangeStart
                  ) {
                      filteredEvents.push(event);
                  }
              }
  
              return filteredEvents;
          }
  
  
          t.getEventCache = function () {
              return cache;
          };
  
  
          t.getPrunedEventCache = function () {
              return prunedCache;
          };
  
  
          /* Fetching
  	-----------------------------------------------------------------------------*/
  
  
          // start and end are assumed to be unzoned
          function isFetchNeeded(start, end) {
              return !rangeStart || // nothing has been fetched yet?
                  start < rangeStart || end > rangeEnd; // is part of the new range outside of the old range?
          }
  
  
          function fetchEvents(start, end) {
              rangeStart = start;
              rangeEnd = end;
              return refetchEvents();
          }
  
  
          // poorly named. fetches all sources with current `rangeStart` and `rangeEnd`.
          function refetchEvents() {
              return fetchEventSources(sources, 'reset');
          }
  
  
          // poorly named. fetches a subset of event sources.
          function refetchEventSources(matchInputs) {
              return fetchEventSources(getEventSourcesByMatchArray(matchInputs));
          }
  
  
          // expects an array of event source objects (the originals, not copies)
          // `specialFetchType` is an optimization parameter that affects purging of the event cache.
          function fetchEventSources(specificSources, specialFetchType) {
              var i, source;
  
              if (specialFetchType === 'reset') {
                  cache = [];
              }
              else if (specialFetchType !== 'add') {
                  cache = excludeEventsBySources(cache, specificSources);
              }
  
              for (i = 0; i < specificSources.length; i++) {
                  source = specificSources[i];
  
                  // already-pending sources have already been accounted for in pendingSourceCnt
                  if (source._status !== 'pending') {
                      pendingSourceCnt++;
                  }
  
                  source._fetchId = (source._fetchId || 0) + 1;
                  source._status = 'pending';
              }
  
              for (i = 0; i < specificSources.length; i++) {
                  source = specificSources[i];
                  tryFetchEventSource(source, source._fetchId);
              }
  
              if (pendingSourceCnt) {
                  return new Promise(function (resolve) {
                      t.one('eventsReceived', resolve); // will send prunedCache
                  });
              }
              else { // executed all synchronously, or no sources at all
                  return Promise.resolve(prunedCache);
              }
          }
  
  
          // fetches an event source and processes its result ONLY if it is still the current fetch.
          // caller is responsible for incrementing pendingSourceCnt first.
          function tryFetchEventSource(source, fetchId) {
              _fetchEventSource(source, function (eventInputs) {
                  var isArraySource = $.isArray(source.events);
                  var i, eventInput;
                  var abstractEvent;
  
                  if (
                      // is this the source's most recent fetch?
                  // if not, rely on an upcoming fetch of this source to decrement pendingSourceCnt
                      fetchId === source._fetchId &&
                      // event source no longer valid?
                      source._status !== 'rejected'
                  ) {
                      source._status = 'resolved';
  
                      if (eventInputs) {
                          for (i = 0; i < eventInputs.length; i++) {
                              eventInput = eventInputs[i];
  
                              if (isArraySource) { // array sources have already been convert to Event Objects
                                  abstractEvent = eventInput;
                              }
                              else {
                                  abstractEvent = buildEventFromInput(eventInput, source);
                              }
  
                              if (abstractEvent) { // not false (an invalid event)
                                  cache.push.apply( // append
                                      cache,
                                      expandEvent(abstractEvent) // add individual expanded events to the cache
                                  );
                              }
                          }
                      }
  
                      decrementPendingSourceCnt();
                  }
              });
          }
  
  
          function rejectEventSource(source) {
              var wasPending = source._status === 'pending';
  
              source._status = 'rejected';
  
              if (wasPending) {
                  decrementPendingSourceCnt();
              }
          }
  
  
          function decrementPendingSourceCnt() {
              pendingSourceCnt--;
              if (!pendingSourceCnt) {
                  reportEventChange(cache); // updates prunedCache
                  t.trigger('eventsReceived', prunedCache);
              }
          }
  
  
          function _fetchEventSource(source, callback) {
              var i;
              var fetchers = FC.sourceFetchers;
              var res;
  
              for (i = 0; i < fetchers.length; i++) {
                  res = fetchers[i].call(
                      t, // this, the Calendar object
                      source,
                      rangeStart.clone(),
                      rangeEnd.clone(),
                      t.options.timezone,
                      callback
                  );
  
                  if (res === true) {
                      // the fetcher is in charge. made its own async request
                      return;
                  }
                  else if (typeof res == 'object') {
                      // the fetcher returned a new source. process it
                      _fetchEventSource(res, callback);
                      return;
                  }
              }
  
              var events = source.events;
              if (events) {
                  if ($.isFunction(events)) {
                      t.pushLoading();
                      events.call(
                          t, // this, the Calendar object
                          rangeStart.clone(),
                          rangeEnd.clone(),
                          t.options.timezone,
                          function (events) {
                              callback(events);
                              t.popLoading();
                          }
                      );
                  }
                  else if ($.isArray(events)) {
                      callback(events);
                  }
                  else {
                      callback();
                  }
              } else {
                  var url = source.url;
                  if (url) {
                      var success = source.success;
                      var error = source.error;
                      var complete = source.complete;
  
                      // retrieve any outbound GET/POST $.ajax data from the options
                      var customData;
                      if ($.isFunction(source.data)) {
                          // supplied as a function that returns a key/value object
                          customData = source.data();
                      }
                      else {
                          // supplied as a straight key/value object
                          customData = source.data;
                      }
  
                      // use a copy of the custom data so we can modify the parameters
                      // and not affect the passed-in object.
                      var data = $.extend({}, customData || {});
  
                      var startParam = firstDefined(source.startParam, t.options.startParam);
                      var endParam = firstDefined(source.endParam, t.options.endParam);
                      var timezoneParam = firstDefined(source.timezoneParam, t.options.timezoneParam);
  
                      if (startParam) {
                          data[startParam] = rangeStart.format();
                      }
                      if (endParam) {
                          data[endParam] = rangeEnd.format();
                      }
                      if (t.options.timezone && t.options.timezone != 'local') {
                          data[timezoneParam] = t.options.timezone;
                      }
  
                      t.pushLoading();
                      $.ajax($.extend({}, ajaxDefaults, source, {
                          data: data,
                          success: function (events) {
                              events = events || [];
                              var res = applyAll(success, this, arguments);
                              if ($.isArray(res)) {
                                  events = res;
                              }
                              callback(events);
                          },
                          error: function () {
                              applyAll(error, this, arguments);
                              callback();
                          },
                          complete: function () {
                              applyAll(complete, this, arguments);
                              t.popLoading();
                          }
                      }));
                  } else {
                      callback();
                  }
              }
          }
  
  
          /* Sources
  	-----------------------------------------------------------------------------*/
  
  
          function addEventSource(sourceInput) {
              var source = buildEventSource(sourceInput);
              if (source) {
                  sources.push(source);
                  fetchEventSources([source], 'add'); // will eventually call reportEventChange
              }
          }
  
  
          function buildEventSource(sourceInput) { // will return undefined if invalid source
              var normalizers = FC.sourceNormalizers;
              var source;
              var i;
  
              if ($.isFunction(sourceInput) || $.isArray(sourceInput)) {
                  source = {events: sourceInput};
              }
              else if (typeof sourceInput === 'string') {
                  source = {url: sourceInput};
              }
              else if (typeof sourceInput === 'object') {
                  source = $.extend({}, sourceInput); // shallow copy
              }
  
              if (source) {
  
                  // TODO: repeat code, same code for event classNames
                  if (source.className) {
                      if (typeof source.className === 'string') {
                          source.className = source.className.split(/\s+/);
                      }
                      // otherwise, assumed to be an array
                  }
                  else {
                      source.className = [];
                  }
  
                  // for array sources, we convert to standard Event Objects up front
                  if ($.isArray(source.events)) {
                      source.origArray = source.events; // for removeEventSource
                      source.events = $.map(source.events, function (eventInput) {
                          return buildEventFromInput(eventInput, source);
                      });
                  }
  
                  for (i = 0; i < normalizers.length; i++) {
                      normalizers[i].call(t, source);
                  }
  
                  return source;
              }
          }
  
  
          function removeEventSource(matchInput) {
              removeSpecificEventSources(
                  getEventSourcesByMatch(matchInput)
              );
          }
  
  
          // if called with no arguments, removes all.
          function removeEventSources(matchInputs) {
              if (matchInputs == null) {
                  removeSpecificEventSources(sources, true); // isAll=true
              }
              else {
                  removeSpecificEventSources(
                      getEventSourcesByMatchArray(matchInputs)
                  );
              }
          }
  
  
          function removeSpecificEventSources(targetSources, isAll) {
              var i;
  
              // cancel pending requests
              for (i = 0; i < targetSources.length; i++) {
                  rejectEventSource(targetSources[i]);
              }
  
              if (isAll) { // an optimization
                  sources = [];
                  cache = [];
              }
              else {
                  // remove from persisted source list
                  sources = $.grep(sources, function (source) {
                      for (i = 0; i < targetSources.length; i++) {
                          if (source === targetSources[i]) {
                              return false; // exclude
                          }
                      }
                      return true; // include
                  });
  
                  cache = excludeEventsBySources(cache, targetSources);
              }
  
              reportEventChange();
          }
  
  
          function getEventSources() {
              return sources.slice(1); // returns a shallow copy of sources with stickySource removed
          }
  
  
          function getEventSourceById(id) {
              return $.grep(sources, function (source) {
                  return source.id && source.id === id;
              })[0];
          }
  
  
          // like getEventSourcesByMatch, but accepts multple match criteria (like multiple IDs)
          function getEventSourcesByMatchArray(matchInputs) {
  
              // coerce into an array
              if (!matchInputs) {
                  matchInputs = [];
              }
              else if (!$.isArray(matchInputs)) {
                  matchInputs = [matchInputs];
              }
  
              var matchingSources = [];
              var i;
  
              // resolve raw inputs to real event source objects
              for (i = 0; i < matchInputs.length; i++) {
                  matchingSources.push.apply( // append
                      matchingSources,
                      getEventSourcesByMatch(matchInputs[i])
                  );
              }
  
              return matchingSources;
          }
  
  
          // matchInput can either by a real event source object, an ID, or the function/URL for the source.
          // returns an array of matching source objects.
          function getEventSourcesByMatch(matchInput) {
              var i, source;
  
              // given an proper event source object
              for (i = 0; i < sources.length; i++) {
                  source = sources[i];
                  if (source === matchInput) {
                      return [source];
                  }
              }
  
              // an ID match
              source = getEventSourceById(matchInput);
              if (source) {
                  return [source];
              }
  
              return $.grep(sources, function (source) {
                  return isSourcesEquivalent(matchInput, source);
              });
          }
  
  
          function isSourcesEquivalent(source1, source2) {
              return source1 && source2 && getSourcePrimitive(source1) == getSourcePrimitive(source2);
          }
  
  
          function getSourcePrimitive(source) {
              return (
                      (typeof source === 'object') ? // a normalized event source?
                          (source.origArray || source.googleCalendarId || source.url || source.events) : // get the primitive
                          null
                  ) ||
                  source; // the given argument *is* the primitive
          }
  
  
          // util
          // returns a filtered array without events that are part of any of the given sources
          function excludeEventsBySources(specificEvents, specificSources) {
              return $.grep(specificEvents, function (event) {
                  for (var i = 0; i < specificSources.length; i++) {
                      if (event.source === specificSources[i]) {
                          return false; // exclude
                      }
                  }
                  return true; // keep
              });
          }
  
  
          /* Manipulation
  	-----------------------------------------------------------------------------*/
  
  
          // Only ever called from the externally-facing API
          function updateEvent(event) {
              updateEvents([event]);
          }
  
  
          // Only ever called from the externally-facing API
          function updateEvents(events) {
              var i, event;
  
              for (i = 0; i < events.length; i++) {
                  event = events[i];
  
                  // massage start/end values, even if date string values
                  event.start = t.moment(event.start);
                  if (event.end) {
                      event.end = t.moment(event.end);
                  }
                  else {
                      event.end = null;
                  }
  
                  mutateEvent(event, getMiscEventProps(event)); // will handle start/end/allDay normalization
              }
  
              reportEventChange(); // reports event modifications (so we can redraw)
          }
  
  
          // Returns a hash of misc event properties that should be copied over to related events.
          function getMiscEventProps(event) {
              var props = {};
  
              $.each(event, function (name, val) {
                  if (isMiscEventPropName(name)) {
                      if (val !== undefined && isAtomic(val)) { // a defined non-object
                          props[name] = val;
                      }
                  }
              });
  
              return props;
          }
  
          // non-date-related, non-id-related, non-secret
          function isMiscEventPropName(name) {
              return !/^_|^(id|allDay|start|end)$/.test(name);
          }
  
  
          // returns the expanded events that were created
          function renderEvent(eventInput, stick) {
              return renderEvents([eventInput], stick);
          }
  
  
          // returns the expanded events that were created
          function renderEvents(eventInputs, stick) {
              var renderedEvents = [];
              var renderableEvents;
              var abstractEvent;
              var i, j, event;
  
              for (i = 0; i < eventInputs.length; i++) {
                  abstractEvent = buildEventFromInput(eventInputs[i]);
  
                  if (abstractEvent) { // not false (a valid input)
                      renderableEvents = expandEvent(abstractEvent);
  
                      for (j = 0; j < renderableEvents.length; j++) {
                          event = renderableEvents[j];
  
                          if (!event.source) {
                              if (stick) {
                                  stickySource.events.push(event);
                                  event.source = stickySource;
                              }
                              cache.push(event);
                          }
                      }
  
                      renderedEvents = renderedEvents.concat(renderableEvents);
                  }
              }
  
              if (renderedEvents.length) { // any new events rendered?
                  reportEventChange();
              }
  
              return renderedEvents;
          }
  
  
          function removeEvents(filter) {
              var eventID;
              var i;
  
              if (filter == null) { // null or undefined. remove all events
                  filter = function () {
                      return true;
                  }; // will always match
              }
              else if (!$.isFunction(filter)) { // an event ID
                  eventID = filter + '';
                  filter = function (event) {
                      return event._id == eventID;
                  };
              }
  
              // Purge event(s) from our local cache
              cache = $.grep(cache, filter, true); // inverse=true
  
              // Remove events from array sources.
              // This works because they have been converted to official Event Objects up front.
              // (and as a result, event._id has been calculated).
              for (i = 0; i < sources.length; i++) {
                  if ($.isArray(sources[i].events)) {
                      sources[i].events = $.grep(sources[i].events, filter, true);
                  }
              }
  
              reportEventChange();
          }
  
  
          function clientEvents(filter) {
              if ($.isFunction(filter)) {
                  return $.grep(cache, filter);
              }
              else if (filter != null) { // not null, not undefined. an event ID
                  filter += '';
                  return $.grep(cache, function (e) {
                      return e._id == filter;
                  });
              }
              return cache; // else, return all
          }
  
  
          // Makes sure all array event sources have their internal event objects
          // converted over to the Calendar's current timezone.
          t.rezoneArrayEventSources = function () {
              var i;
              var events;
              var j;
  
              for (i = 0; i < sources.length; i++) {
                  events = sources[i].events;
                  if ($.isArray(events)) {
  
                      for (j = 0; j < events.length; j++) {
                          rezoneEventDates(events[j]);
                      }
                  }
              }
          };
  
          function rezoneEventDates(event) {
              event.start = t.moment(event.start);
              if (event.end) {
                  event.end = t.moment(event.end);
              }
              backupEventDates(event);
          }
  
  
          /* Event Normalization
  	-----------------------------------------------------------------------------*/
  
  
          // Given a raw object with key/value properties, returns an "abstract" Event object.
          // An "abstract" event is an event that, if recurring, will not have been expanded yet.
          // Will return `false` when input is invalid.
          // `source` is optional
          function buildEventFromInput(input, source) {
              var out = {};
              var start, end;
              var allDay;
  
              if (t.options.eventDataTransform) {
                  input = t.options.eventDataTransform(input);
              }
              if (source && source.eventDataTransform) {
                  input = source.eventDataTransform(input);
              }
  
              // Copy all properties over to the resulting object.
              // The special-case properties will be copied over afterwards.
              $.extend(out, input);
  
              if (source) {
                  out.source = source;
              }
  
              out._id = input._id || (input.id === undefined ? '_fc' + eventGUID++ : input.id + '');
  
              if (input.className) {
                  if (typeof input.className == 'string') {
                      out.className = input.className.split(/\s+/);
                  }
                  else { // assumed to be an array
                      out.className = input.className;
                  }
              }
              else {
                  out.className = [];
              }
  
              start = input.start || input.date; // "date" is an alias for "start"
              end = input.end;
  
              // parse as a time (Duration) if applicable
              if (isTimeString(start)) {
                  start = moment.duration(start);
              }
              if (isTimeString(end)) {
                  end = moment.duration(end);
              }
  
              if (input.dow || moment.isDuration(start) || moment.isDuration(end)) {
  
                  // the event is "abstract" (recurring) so don't calculate exact start/end dates just yet
                  out.start = start ? moment.duration(start) : null; // will be a Duration or null
                  out.end = end ? moment.duration(end) : null; // will be a Duration or null
                  out._recurring = true; // our internal marker
              }
              else {
  
                  if (start) {
                      start = t.moment(start);
                      if (!start.isValid()) {
                          return false;
                      }
                  }
  
                  if (end) {
                      end = t.moment(end);
                      if (!end.isValid()) {
                          end = null; // let defaults take over
                      }
                  }
  
                  allDay = input.allDay;
                  if (allDay === undefined) { // still undefined? fallback to default
                      allDay = firstDefined(
                          source ? source.allDayDefault : undefined,
                          t.options.allDayDefault
                      );
                      // still undefined? normalizeEventDates will calculate it
                  }
  
                  assignDatesToEvent(start, end, allDay, out);
              }
  
              t.normalizeEvent(out); // hook for external use. a prototype method
  
              return out;
          }
  
          t.buildEventFromInput = buildEventFromInput;
  
  
          // Normalizes and assigns the given dates to the given partially-formed event object.
          // NOTE: mutates the given start/end moments. does not make a copy.
          function assignDatesToEvent(start, end, allDay, event) {
              event.start = start;
              event.end = end;
              event.allDay = allDay;
              normalizeEventDates(event);
              backupEventDates(event);
          }
  
  
          // Ensures proper values for allDay/start/end. Accepts an Event object, or a plain object with event-ish properties.
          // NOTE: Will modify the given object.
          function normalizeEventDates(eventProps) {
  
              normalizeEventTimes(eventProps);
  
              if (eventProps.end && !eventProps.end.isAfter(eventProps.start)) {
                  eventProps.end = null;
              }
  
              if (!eventProps.end) {
                  if (t.options.forceEventDuration) {
                      eventProps.end = t.getDefaultEventEnd(eventProps.allDay, eventProps.start);
                  }
                  else {
                      eventProps.end = null;
                  }
              }
          }
  
  
          // Ensures the allDay property exists and the timeliness of the start/end dates are consistent
          function normalizeEventTimes(eventProps) {
              if (eventProps.allDay == null) {
                  eventProps.allDay = !(eventProps.start.hasTime() || (eventProps.end && eventProps.end.hasTime()));
              }
  
              if (eventProps.allDay) {
                  eventProps.start.stripTime();
                  if (eventProps.end) {
                      // TODO: consider nextDayThreshold here? If so, will require a lot of testing and adjustment
                      eventProps.end.stripTime();
                  }
              }
              else {
                  if (!eventProps.start.hasTime()) {
                      eventProps.start = t.applyTimezone(eventProps.start.time(0)); // will assign a 00:00 time
                  }
                  if (eventProps.end && !eventProps.end.hasTime()) {
                      eventProps.end = t.applyTimezone(eventProps.end.time(0)); // will assign a 00:00 time
                  }
              }
          }
  
  
          // If the given event is a recurring event, break it down into an array of individual instances.
          // If not a recurring event, return an array with the single original event.
          // If given a falsy input (probably because of a failed buildEventFromInput call), returns an empty array.
          // HACK: can override the recurring window by providing custom rangeStart/rangeEnd (for businessHours).
          function expandEvent(abstractEvent, _rangeStart, _rangeEnd) {
              var events = [];
              var dowHash;
              var dow;
              var i;
              var date;
              var startTime, endTime;
              var start, end;
              var event;
  
              _rangeStart = _rangeStart || rangeStart;
              _rangeEnd = _rangeEnd || rangeEnd;
  
              if (abstractEvent) {
                  if (abstractEvent._recurring) {
  
                      // make a boolean hash as to whether the event occurs on each day-of-week
                      if ((dow = abstractEvent.dow)) {
                          dowHash = {};
                          for (i = 0; i < dow.length; i++) {
                              dowHash[dow[i]] = true;
                          }
                      }
  
                      // iterate through every day in the current range
                      date = _rangeStart.clone().stripTime(); // holds the date of the current day
                      while (date.isBefore(_rangeEnd)) {
  
                          if (!dowHash || dowHash[date.day()]) { // if everyday, or this particular day-of-week
  
                              startTime = abstractEvent.start; // the stored start and end properties are times (Durations)
                              endTime = abstractEvent.end; // "
                              start = date.clone();
                              end = null;
  
                              if (startTime) {
                                  start = start.time(startTime);
                              }
                              if (endTime) {
                                  end = date.clone().time(endTime);
                              }
  
                              event = $.extend({}, abstractEvent); // make a copy of the original
                              assignDatesToEvent(
                                  start, end,
                                  !startTime && !endTime, // allDay?
                                  event
                              );
                              events.push(event);
                          }
  
                          date.add(1, 'days');
                      }
                  }
                  else {
                      events.push(abstractEvent); // return the original event. will be a one-item array
                  }
              }
  
              return events;
          }
  
          t.expandEvent = expandEvent;
  
  
          /* Event Modification Math
  	-----------------------------------------------------------------------------------------*/
  
  
          // Modifies an event and all related events by applying the given properties.
          // Special date-diffing logic is used for manipulation of dates.
          // If `props` does not contain start/end dates, the updated values are assumed to be the event's current start/end.
          // All date comparisons are done against the event's pristine _start and _end dates.
          // Returns an object with delta information and a function to undo all operations.
          // For making computations in a granularity greater than day/time, specify largeUnit.
          // NOTE: The given `newProps` might be mutated for normalization purposes.
          function mutateEvent(event, newProps, largeUnit) {
              var miscProps = {};
              var oldProps;
              var clearEnd;
              var startDelta;
              var endDelta;
              var durationDelta;
              var undoFunc;
  
              // diffs the dates in the appropriate way, returning a duration
              function diffDates(date1, date0) { // date1 - date0
                  if (largeUnit) {
                      return diffByUnit(date1, date0, largeUnit);
                  }
                  else if (newProps.allDay) {
                      return diffDay(date1, date0);
                  }
                  else {
                      return diffDayTime(date1, date0);
                  }
              }
  
              newProps = newProps || {};
  
              // normalize new date-related properties
              if (!newProps.start) {
                  newProps.start = event.start.clone();
              }
              if (newProps.end === undefined) {
                  newProps.end = event.end ? event.end.clone() : null;
              }
              if (newProps.allDay == null) { // is null or undefined?
                  newProps.allDay = event.allDay;
              }
              normalizeEventDates(newProps);
  
              // create normalized versions of the original props to compare against
              // need a real end value, for diffing
              oldProps = {
                  start: event._start.clone(),
                  end: event._end ? event._end.clone() : t.getDefaultEventEnd(event._allDay, event._start),
                  allDay: newProps.allDay // normalize the dates in the same regard as the new properties
              };
              normalizeEventDates(oldProps);
  
              // need to clear the end date if explicitly changed to null
              clearEnd = event._end !== null && newProps.end === null;
  
              // compute the delta for moving the start date
              startDelta = diffDates(newProps.start, oldProps.start);
  
              // compute the delta for moving the end date
              if (newProps.end) {
                  endDelta = diffDates(newProps.end, oldProps.end);
                  durationDelta = endDelta.subtract(startDelta);
              }
              else {
                  durationDelta = null;
              }
  
              // gather all non-date-related properties
              $.each(newProps, function (name, val) {
                  if (isMiscEventPropName(name)) {
                      if (val !== undefined) {
                          miscProps[name] = val;
                      }
                  }
              });
  
              // apply the operations to the event and all related events
              undoFunc = mutateEvents(
                  clientEvents(event._id), // get events with this ID
                  clearEnd,
                  newProps.allDay,
                  startDelta,
                  durationDelta,
                  miscProps
              );
  
              return {
                  dateDelta: startDelta,
                  durationDelta: durationDelta,
                  undo: undoFunc
              };
          }
  
  
          // Modifies an array of events in the following ways (operations are in order):
          // - clear the event's `end`
          // - convert the event to allDay
          // - add `dateDelta` to the start and end
          // - add `durationDelta` to the event's duration
          // - assign `miscProps` to the event
          //
          // Returns a function that can be called to undo all the operations.
          //
          // TODO: don't use so many closures. possible memory issues when lots of events with same ID.
          //
          function mutateEvents(events, clearEnd, allDay, dateDelta, durationDelta, miscProps) {
              var isAmbigTimezone = t.getIsAmbigTimezone();
              var undoFunctions = [];
  
              // normalize zero-length deltas to be null
              if (dateDelta && !dateDelta.valueOf()) {
                  dateDelta = null;
              }
              if (durationDelta && !durationDelta.valueOf()) {
                  durationDelta = null;
              }
  
              $.each(events, function (i, event) {
                  var oldProps;
                  var newProps;
  
                  // build an object holding all the old values, both date-related and misc.
                  // for the undo function.
                  oldProps = {
                      start: event.start.clone(),
                      end: event.end ? event.end.clone() : null,
                      allDay: event.allDay
                  };
                  $.each(miscProps, function (name) {
                      oldProps[name] = event[name];
                  });
  
                  // new date-related properties. work off the original date snapshot.
                  // ok to use references because they will be thrown away when backupEventDates is called.
                  newProps = {
                      start: event._start,
                      end: event._end,
                      allDay: allDay // normalize the dates in the same regard as the new properties
                  };
                  normalizeEventDates(newProps); // massages start/end/allDay
  
                  // strip or ensure the end date
                  if (clearEnd) {
                      newProps.end = null;
                  }
                  else if (durationDelta && !newProps.end) { // the duration translation requires an end date
                      newProps.end = t.getDefaultEventEnd(newProps.allDay, newProps.start);
                  }
  
                  if (dateDelta) {
                      newProps.start.add(dateDelta);
                      if (newProps.end) {
                          newProps.end.add(dateDelta);
                      }
                  }
  
                  if (durationDelta) {
                      newProps.end.add(durationDelta); // end already ensured above
                  }
  
                  // if the dates have changed, and we know it is impossible to recompute the
                  // timezone offsets, strip the zone.
                  if (
                      isAmbigTimezone &&
                      !newProps.allDay &&
                      (dateDelta || durationDelta)
                  ) {
                      newProps.start.stripZone();
                      if (newProps.end) {
                          newProps.end.stripZone();
                      }
                  }
  
                  $.extend(event, miscProps, newProps); // copy over misc props, then date-related props
                  backupEventDates(event); // regenerate internal _start/_end/_allDay
  
                  undoFunctions.push(function () {
                      $.extend(event, oldProps);
                      backupEventDates(event); // regenerate internal _start/_end/_allDay
                  });
              });
  
              return function () {
                  for (var i = 0; i < undoFunctions.length; i++) {
                      undoFunctions[i]();
                  }
              };
          }
  
      }
  
  
  // returns an undo function
      Calendar.prototype.mutateSeg = function (seg, newProps) {
          return this.mutateEvent(seg.event, newProps);
      };
  
  
  // hook for external libs to manipulate event properties upon creation.
  // should manipulate the event in-place.
      Calendar.prototype.normalizeEvent = function (event) {
      };
  
  
  // Does the given span (start, end, and other location information)
  // fully contain the other?
      Calendar.prototype.spanContainsSpan = function (outerSpan, innerSpan) {
          var eventStart = outerSpan.start.clone().stripZone();
          var eventEnd = this.getEventEnd(outerSpan).stripZone();
  
          return innerSpan.start >= eventStart && innerSpan.end <= eventEnd;
      };
  
  
  // Returns a list of events that the given event should be compared against when being considered for a move to
  // the specified span. Attached to the Calendar's prototype because EventManager is a mixin for a Calendar.
      Calendar.prototype.getPeerEvents = function (span, event) {
          var cache = this.getEventCache();
          var peerEvents = [];
          var i, otherEvent;
  
          for (i = 0; i < cache.length; i++) {
              otherEvent = cache[i];
              if (
                  !event ||
                  event._id !== otherEvent._id // don't compare the event to itself or other related [repeating] events
              ) {
                  peerEvents.push(otherEvent);
              }
          }
  
          return peerEvents;
      };
  
  
  // updates the "backup" properties, which are preserved in order to compute diffs later on.
      function backupEventDates(event) {
          event._allDay = event.allDay;
          event._start = event.start.clone();
          event._end = event.end ? event.end.clone() : null;
      }
  
  
      /* Overlapping / Constraining
  -----------------------------------------------------------------------------------------*/
  
  
  // Determines if the given event can be relocated to the given span (unzoned start/end with other misc data)
      Calendar.prototype.isEventSpanAllowed = function (span, event) {
          var source = event.source || {};
  
          var constraint = firstDefined(
              event.constraint,
              source.constraint,
              this.options.eventConstraint
          );
  
          var overlap = firstDefined(
              event.overlap,
              source.overlap,
              this.options.eventOverlap
          );
  
          return this.isSpanAllowed(span, constraint, overlap, event) &&
              (!this.options.eventAllow || this.options.eventAllow(span, event) !== false);
      };
  
  
  // Determines if an external event can be relocated to the given span (unzoned start/end with other misc data)
      Calendar.prototype.isExternalSpanAllowed = function (eventSpan, eventLocation, eventProps) {
          var eventInput;
          var event;
  
          // note: very similar logic is in View's reportExternalDrop
          if (eventProps) {
              eventInput = $.extend({}, eventProps, eventLocation);
              event = this.expandEvent(
                  this.buildEventFromInput(eventInput)
              )[0];
          }
  
          if (event) {
              return this.isEventSpanAllowed(eventSpan, event);
          }
          else { // treat it as a selection
  
              return this.isSelectionSpanAllowed(eventSpan);
          }
      };
  
  
  // Determines the given span (unzoned start/end with other misc data) can be selected.
      Calendar.prototype.isSelectionSpanAllowed = function (span) {
          return this.isSpanAllowed(span, this.options.selectConstraint, this.options.selectOverlap) &&
              (!this.options.selectAllow || this.options.selectAllow(span) !== false);
      };
  
  
  // Returns true if the given span (caused by an event drop/resize or a selection) is allowed to exist
  // according to the constraint/overlap settings.
  // `event` is not required if checking a selection.
      Calendar.prototype.isSpanAllowed = function (span, constraint, overlap, event) {
          var constraintEvents;
          var anyContainment;
          var peerEvents;
          var i, peerEvent;
          var peerOverlap;
  
          // the range must be fully contained by at least one of produced constraint events
          if (constraint != null) {
  
              // not treated as an event! intermediate data structure
              // TODO: use ranges in the future
              constraintEvents = this.constraintToEvents(constraint);
              if (constraintEvents) { // not invalid
  
                  anyContainment = false;
                  for (i = 0; i < constraintEvents.length; i++) {
                      if (this.spanContainsSpan(constraintEvents[i], span)) {
                          anyContainment = true;
                          break;
                      }
                  }
  
                  if (!anyContainment) {
                      return false;
                  }
              }
          }
  
          peerEvents = this.getPeerEvents(span, event);
  
          for (i = 0; i < peerEvents.length; i++) {
              peerEvent = peerEvents[i];
  
              // there needs to be an actual intersection before disallowing anything
              if (this.eventIntersectsRange(peerEvent, span)) {
  
                  // evaluate overlap for the given range and short-circuit if necessary
                  if (overlap === false) {
                      return false;
                  }
                  // if the event's overlap is a test function, pass the peer event in question as the first param
                  else if (typeof overlap === 'function' && !overlap(peerEvent, event)) {
                      return false;
                  }
  
                  // if we are computing if the given range is allowable for an event, consider the other event's
                  // EventObject-specific or Source-specific `overlap` property
                  if (event) {
                      peerOverlap = firstDefined(
                          peerEvent.overlap,
                          (peerEvent.source || {}).overlap
                          // we already considered the global `eventOverlap`
                      );
                      if (peerOverlap === false) {
                          return false;
                      }
                      // if the peer event's overlap is a test function, pass the subject event as the first param
                      if (typeof peerOverlap === 'function' && !peerOverlap(event, peerEvent)) {
                          return false;
                      }
                  }
              }
          }
  
          return true;
      };
  
  
  // Given an event input from the API, produces an array of event objects. Possible event inputs:
  // 'businessHours'
  // An event ID (number or string)
  // An object with specific start/end dates or a recurring event (like what businessHours accepts)
      Calendar.prototype.constraintToEvents = function (constraintInput) {
  
          if (constraintInput === 'businessHours') {
              return this.getCurrentBusinessHourEvents();
          }
  
          if (typeof constraintInput === 'object') {
              if (constraintInput.start != null) { // needs to be event-like input
                  return this.expandEvent(this.buildEventFromInput(constraintInput));
              }
              else {
                  return null; // invalid
              }
          }
  
          return this.clientEvents(constraintInput); // probably an ID
      };
  
  
  // Does the event's date range intersect with the given range?
  // start/end already assumed to have stripped zones :(
      Calendar.prototype.eventIntersectsRange = function (event, range) {
          var eventStart = event.start.clone().stripZone();
          var eventEnd = this.getEventEnd(event).stripZone();
  
          return range.start < eventEnd && range.end > eventStart;
      };
  
  
      /* Business Hours
  -----------------------------------------------------------------------------------------*/
  
      var BUSINESS_HOUR_EVENT_DEFAULTS = {
          id: '_fcBusinessHours', // will relate events from different calls to expandEvent
          start: '09:00',
          end: '17:00',
          dow: [1, 2, 3, 4, 5], // monday - friday
          rendering: 'inverse-background'
          // classNames are defined in businessHoursSegClasses
      };
  
  // Return events objects for business hours within the current view.
  // Abuse of our event system :(
      Calendar.prototype.getCurrentBusinessHourEvents = function (wholeDay) {
          return this.computeBusinessHourEvents(wholeDay, this.options.businessHours);
      };
  
  // Given a raw input value from options, return events objects for business hours within the current view.
      Calendar.prototype.computeBusinessHourEvents = function (wholeDay, input) {
          if (input === true) {
              return this.expandBusinessHourEvents(wholeDay, [{}]);
          }
          else if ($.isPlainObject(input)) {
              return this.expandBusinessHourEvents(wholeDay, [input]);
          }
          else if ($.isArray(input)) {
              return this.expandBusinessHourEvents(wholeDay, input, true);
          }
          else {
              return [];
          }
      };
  
  // inputs expected to be an array of objects.
  // if ignoreNoDow is true, will ignore entries that don't specify a day-of-week (dow) key.
      Calendar.prototype.expandBusinessHourEvents = function (wholeDay, inputs, ignoreNoDow) {
          var view = this.getView();
          var events = [];
          var i, input;
  
          for (i = 0; i < inputs.length; i++) {
              input = inputs[i];
  
              if (ignoreNoDow && !input.dow) {
                  continue;
              }
  
              // give defaults. will make a copy
              input = $.extend({}, BUSINESS_HOUR_EVENT_DEFAULTS, input);
  
              // if a whole-day series is requested, clear the start/end times
              if (wholeDay) {
                  input.start = null;
                  input.end = null;
              }
  
              events.push.apply(events, // append
                  this.expandEvent(
                      this.buildEventFromInput(input),
                      view.start,
                      view.end
                  )
              );
          }
  
          return events;
      };
  
      ;
      ;
  
      /* An abstract class for the "basic" views, as well as month view. Renders one or more rows of day cells.
  ----------------------------------------------------------------------------------------------------------------------*/
  // It is a manager for a DayGrid subcomponent, which does most of the heavy lifting.
  // It is responsible for managing width/height.
  
      var BasicView = FC.BasicView = View.extend({
  
          scroller: null,
  
          dayGridClass: DayGrid, // class the dayGrid will be instantiated from (overridable by subclasses)
          dayGrid: null, // the main subcomponent that does most of the heavy lifting
  
          dayNumbersVisible: false, // display day numbers on each day cell?
          colWeekNumbersVisible: false, // display week numbers along the side?
          cellWeekNumbersVisible: false, // display week numbers in day cell?
  
          weekNumberWidth: null, // width of all the week-number cells running down the side
  
          headContainerEl: null, // div that hold's the dayGrid's rendered date header
          headRowEl: null, // the fake row element of the day-of-week header
  
  
          initialize: function () {
              this.dayGrid = this.instantiateDayGrid();
  
              this.scroller = new Scroller({
                  overflowX: 'hidden',
                  overflowY: 'auto'
              });
          },
  
  
          // Generates the DayGrid object this view needs. Draws from this.dayGridClass
          instantiateDayGrid: function () {
              // generate a subclass on the fly with BasicView-specific behavior
              // TODO: cache this subclass
              var subclass = this.dayGridClass.extend(basicDayGridMethods);
  
              return new subclass(this);
          },
  
  
          // Sets the display range and computes all necessary dates
          setRange: function (range) {
              View.prototype.setRange.call(this, range); // call the super-method
  
              this.dayGrid.breakOnWeeks = /year|month|week/.test(this.intervalUnit); // do before setRange
              this.dayGrid.setRange(range);
          },
  
  
          // Compute the value to feed into setRange. Overrides superclass.
          computeRange: function (date) {
              var range = View.prototype.computeRange.call(this, date); // get value from the super-method
  
              // year and month views should be aligned with weeks. this is already done for week
              if (/year|month/.test(range.intervalUnit)) {
                  range.start.startOf('week');
                  range.start = this.skipHiddenDays(range.start);
  
                  // make end-of-week if not already
                  if (range.end.weekday()) {
                      range.end.add(1, 'week').startOf('week');
                      range.end = this.skipHiddenDays(range.end, -1, true); // exclusively move backwards
                  }
              }
  
              return range;
          },
  
  
          // Renders the view into `this.el`, which should already be assigned
          renderDates: function () {
  
              this.dayNumbersVisible = this.dayGrid.rowCnt > 1; // TODO: make grid responsible
              if (this.opt('weekNumbers')) {
                  if (this.opt('weekNumbersWithinDays')) {
                      this.cellWeekNumbersVisible = true;
                      this.colWeekNumbersVisible = false;
                  }
                  else {
                      this.cellWeekNumbersVisible = false;
                      this.colWeekNumbersVisible = true;
                  }
                  ;
              }
              this.dayGrid.numbersVisible = this.dayNumbersVisible ||
                  this.cellWeekNumbersVisible || this.colWeekNumbersVisible;
  
              this.el.addClass('fc-basic-view').html(this.renderSkeletonHtml());
              this.renderHead();
  
              this.scroller.render();
              var dayGridContainerEl = this.scroller.el.addClass('fc-day-grid-container');
              var dayGridEl = $('<div class="fc-day-grid" />').appendTo(dayGridContainerEl);
              this.el.find('.fc-body > tr > td').append(dayGridContainerEl);
  
              this.dayGrid.setElement(dayGridEl);
              this.dayGrid.renderDates(this.hasRigidRows());
          },
  
  
          // render the day-of-week headers
          renderHead: function () {
              this.headContainerEl =
                  this.el.find('.fc-head-container')
                      .html(this.dayGrid.renderHeadHtml());
              this.headRowEl = this.headContainerEl.find('.fc-row');
          },
  
  
          // Unrenders the content of the view. Since we haven't separated skeleton rendering from date rendering,
          // always completely kill the dayGrid's rendering.
          unrenderDates: function () {
              this.dayGrid.unrenderDates();
              this.dayGrid.removeElement();
              this.scroller.destroy();
          },
  
  
          renderBusinessHours: function () {
              this.dayGrid.renderBusinessHours();
          },
  
  
          unrenderBusinessHours: function () {
              this.dayGrid.unrenderBusinessHours();
          },
  
  
          // Builds the HTML skeleton for the view.
          // The day-grid component will render inside of a container defined by this HTML.
          renderSkeletonHtml: function () {
              return '' +
                  '<table>' +
                  '<thead class="fc-head">' +
                  '<tr>' +
                  '<td class="fc-head-container ' + this.widgetHeaderClass + '"></td>' +
                  '</tr>' +
                  '</thead>' +
                  '<tbody class="fc-body">' +
                  '<tr>' +
                  '<td class="' + this.widgetContentClass + '"></td>' +
                  '</tr>' +
                  '</tbody>' +
                  '</table>';
          },
  
  
          // Generates an HTML attribute string for setting the width of the week number column, if it is known
          weekNumberStyleAttr: function () {
              if (this.weekNumberWidth !== null) {
                  return 'style="width:' + this.weekNumberWidth + 'px"';
              }
              return '';
          },
  
  
          // Determines whether each row should have a constant height
          hasRigidRows: function () {
              var eventLimit = this.opt('eventLimit');
              return eventLimit && typeof eventLimit !== 'number';
          },
  
  
          /* Dimensions
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Refreshes the horizontal dimensions of the view
          updateWidth: function () {
              if (this.colWeekNumbersVisible) {
                  // Make sure all week number cells running down the side have the same width.
                  // Record the width for cells created later.
                  this.weekNumberWidth = matchCellWidths(
                      this.el.find('.fc-week-number')
                  );
              }
          },
  
  
          // Adjusts the vertical dimensions of the view to the specified values
          setHeight: function (totalHeight, isAuto) {
              var eventLimit = this.opt('eventLimit');
              var scrollerHeight;
              var scrollbarWidths;
  
              // reset all heights to be natural
              this.scroller.clear();
              uncompensateScroll(this.headRowEl);
  
              this.dayGrid.removeSegPopover(); // kill the "more" popover if displayed
  
              // is the event limit a constant level number?
              if (eventLimit && typeof eventLimit === 'number') {
                  this.dayGrid.limitRows(eventLimit); // limit the levels first so the height can redistribute after
              }
  
              // distribute the height to the rows
              // (totalHeight is a "recommended" value if isAuto)
              scrollerHeight = this.computeScrollerHeight(totalHeight);
              this.setGridHeight(scrollerHeight, isAuto);
  
              // is the event limit dynamically calculated?
              if (eventLimit && typeof eventLimit !== 'number') {
                  this.dayGrid.limitRows(eventLimit); // limit the levels after the grid's row heights have been set
              }
  
              if (!isAuto) { // should we force dimensions of the scroll container?
  
                  this.scroller.setHeight(scrollerHeight);
                  scrollbarWidths = this.scroller.getScrollbarWidths();
  
                  if (scrollbarWidths.left || scrollbarWidths.right) { // using scrollbars?
  
                      compensateScroll(this.headRowEl, scrollbarWidths);
  
                      // doing the scrollbar compensation might have created text overflow which created more height. redo
                      scrollerHeight = this.computeScrollerHeight(totalHeight);
                      this.scroller.setHeight(scrollerHeight);
                  }
  
                  // guarantees the same scrollbar widths
                  this.scroller.lockOverflow(scrollbarWidths);
              }
          },
  
  
          // given a desired total height of the view, returns what the height of the scroller should be
          computeScrollerHeight: function (totalHeight) {
              return totalHeight -
                  subtractInnerElHeight(this.el, this.scroller.el); // everything that's NOT the scroller
          },
  
  
          // Sets the height of just the DayGrid component in this view
          setGridHeight: function (height, isAuto) {
              if (isAuto) {
                  undistributeHeight(this.dayGrid.rowEls); // let the rows be their natural height with no expanding
              }
              else {
                  distributeHeight(this.dayGrid.rowEls, height, true); // true = compensate for height-hogging rows
              }
          },
  
  
          /* Scroll
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          computeInitialScroll: function () {
              return {top: 0};
          },
  
  
          queryScroll: function () {
              return {top: this.scroller.getScrollTop()};
          },
  
  
          setScroll: function (scroll) {
              this.scroller.setScrollTop(scroll.top);
          },
  
  
          /* Hit Areas
  	------------------------------------------------------------------------------------------------------------------*/
          // forward all hit-related method calls to dayGrid
  
  
          hitsNeeded: function () {
              this.dayGrid.hitsNeeded();
          },
  
  
          hitsNotNeeded: function () {
              this.dayGrid.hitsNotNeeded();
          },
  
  
          prepareHits: function () {
              this.dayGrid.prepareHits();
          },
  
  
          releaseHits: function () {
              this.dayGrid.releaseHits();
          },
  
  
          queryHit: function (left, top) {
              return this.dayGrid.queryHit(left, top);
          },
  
  
          getHitSpan: function (hit) {
              return this.dayGrid.getHitSpan(hit);
          },
  
  
          getHitEl: function (hit) {
              return this.dayGrid.getHitEl(hit);
          },
  
  
          /* Events
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders the given events onto the view and populates the segments array
          renderEvents: function (events) {
              this.dayGrid.renderEvents(events);
  
              this.updateHeight(); // must compensate for events that overflow the row
          },
  
  
          // Retrieves all segment objects that are rendered in the view
          getEventSegs: function () {
              return this.dayGrid.getEventSegs();
          },
  
  
          // Unrenders all event elements and clears internal segment data
          unrenderEvents: function () {
              this.dayGrid.unrenderEvents();
  
              // we DON'T need to call updateHeight() because
              // a renderEvents() call always happens after this, which will eventually call updateHeight()
          },
  
  
          /* Dragging (for both events and external elements)
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // A returned value of `true` signals that a mock "helper" event has been rendered.
          renderDrag: function (dropLocation, seg) {
              return this.dayGrid.renderDrag(dropLocation, seg);
          },
  
  
          unrenderDrag: function () {
              this.dayGrid.unrenderDrag();
          },
  
  
          /* Selection
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a visual indication of a selection
          renderSelection: function (span) {
              this.dayGrid.renderSelection(span);
          },
  
  
          // Unrenders a visual indications of a selection
          unrenderSelection: function () {
              this.dayGrid.unrenderSelection();
          }
  
      });
  
  
  // Methods that will customize the rendering behavior of the BasicView's dayGrid
      var basicDayGridMethods = {
  
  
          // Generates the HTML that will go before the day-of week header cells
          renderHeadIntroHtml: function () {
              var view = this.view;
  
              if (view.colWeekNumbersVisible) {
                  return '' +
                      '<th class="fc-week-number ' + view.widgetHeaderClass + '" ' + view.weekNumberStyleAttr() + '>' +
                      '<span>' + // needed for matchCellWidths
                      htmlEscape(view.opt('weekNumberTitle')) +
                      '</span>' +
                      '</th>';
              }
  
              return '';
          },
  
  
          // Generates the HTML that will go before content-skeleton cells that display the day/week numbers
          renderNumberIntroHtml: function (row) {
              var view = this.view;
              var weekStart = this.getCellDate(row, 0);
  
              if (view.colWeekNumbersVisible) {
                  return '' +
                      '<td class="fc-week-number" ' + view.weekNumberStyleAttr() + '>' +
                      view.buildGotoAnchorHtml( // aside from link, important for matchCellWidths
                          {date: weekStart, type: 'week', forceOff: this.colCnt === 1},
                          weekStart.format('w') // inner HTML
                      ) +
                      '</td>';
              }
  
              return '';
          },
  
  
          // Generates the HTML that goes before the day bg cells for each day-row
          renderBgIntroHtml: function () {
              var view = this.view;
  
              if (view.colWeekNumbersVisible) {
                  return '<td class="fc-week-number ' + view.widgetContentClass + '" ' +
                      view.weekNumberStyleAttr() + '></td>';
              }
  
              return '';
          },
  
  
          // Generates the HTML that goes before every other type of row generated by DayGrid.
          // Affects helper-skeleton and highlight-skeleton rows.
          renderIntroHtml: function () {
              var view = this.view;
  
              if (view.colWeekNumbersVisible) {
                  return '<td class="fc-week-number" ' + view.weekNumberStyleAttr() + '></td>';
              }
  
              return '';
          }
  
      };
  
      ;
      ;
  
      /* A month view with day cells running in rows (one-per-week) and columns
  ----------------------------------------------------------------------------------------------------------------------*/
  
      var MonthView = FC.MonthView = BasicView.extend({
  
          // Produces information about what range to display
          computeRange: function (date) {
              var range = BasicView.prototype.computeRange.call(this, date); // get value from super-method
              var rowCnt;
  
              // ensure 6 weeks
              if (this.isFixedWeeks()) {
                  rowCnt = Math.ceil(range.end.diff(range.start, 'weeks', true)); // could be partial weeks due to hiddenDays
                  range.end.add(6 - rowCnt, 'weeks');
              }
  
              return range;
          },
  
  
          // Overrides the default BasicView behavior to have special multi-week auto-height logic
          setGridHeight: function (height, isAuto) {
  
              // if auto, make the height of each row the height that it would be if there were 6 weeks
              if (isAuto) {
                  height *= this.rowCnt / 6;
              }
  
              distributeHeight(this.dayGrid.rowEls, height, !isAuto); // if auto, don't compensate for height-hogging rows
          },
  
  
          isFixedWeeks: function () {
              return this.opt('fixedWeekCount');
          }
  
      });
  
      ;
      ;
  
      fcViews.basic = {
          'class': BasicView
      };
  
      fcViews.basicDay = {
          type: 'basic',
          duration: {days: 1}
      };
  
      fcViews.basicWeek = {
          type: 'basic',
          duration: {weeks: 1}
      };
  
      fcViews.month = {
          'class': MonthView,
          duration: {months: 1}, // important for prev/next
          defaults: {
              fixedWeekCount: true
          }
      };
      ;
      ;
  
      /* An abstract class for all agenda-related views. Displays one more columns with time slots running vertically.
  ----------------------------------------------------------------------------------------------------------------------*/
  // Is a manager for the TimeGrid subcomponent and possibly the DayGrid subcomponent (if allDaySlot is on).
  // Responsible for managing width/height.
  
      var AgendaView = FC.AgendaView = View.extend({
  
          scroller: null,
  
          timeGridClass: TimeGrid, // class used to instantiate the timeGrid. subclasses can override
          timeGrid: null, // the main time-grid subcomponent of this view
  
          dayGridClass: DayGrid, // class used to instantiate the dayGrid. subclasses can override
          dayGrid: null, // the "all-day" subcomponent. if all-day is turned off, this will be null
  
          axisWidth: null, // the width of the time axis running down the side
  
          headContainerEl: null, // div that hold's the timeGrid's rendered date header
          noScrollRowEls: null, // set of fake row elements that must compensate when scroller has scrollbars
  
          // when the time-grid isn't tall enough to occupy the given height, we render an <hr> underneath
          bottomRuleEl: null,
  
  
          initialize: function () {
              this.timeGrid = this.instantiateTimeGrid();
  
              if (this.opt('allDaySlot')) { // should we display the "all-day" area?
                  this.dayGrid = this.instantiateDayGrid(); // the all-day subcomponent of this view
              }
  
              this.scroller = new Scroller({
                  overflowX: 'hidden',
                  overflowY: 'auto'
              });
          },
  
  
          // Instantiates the TimeGrid object this view needs. Draws from this.timeGridClass
          instantiateTimeGrid: function () {
              var subclass = this.timeGridClass.extend(agendaTimeGridMethods);
  
              return new subclass(this);
          },
  
  
          // Instantiates the DayGrid object this view might need. Draws from this.dayGridClass
          instantiateDayGrid: function () {
              var subclass = this.dayGridClass.extend(agendaDayGridMethods);
  
              return new subclass(this);
          },
  
  
          /* Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Sets the display range and computes all necessary dates
          setRange: function (range) {
              View.prototype.setRange.call(this, range); // call the super-method
  
              this.timeGrid.setRange(range);
              if (this.dayGrid) {
                  this.dayGrid.setRange(range);
              }
          },
  
  
          // Renders the view into `this.el`, which has already been assigned
          renderDates: function () {
  
              this.el.addClass('fc-agenda-view').html(this.renderSkeletonHtml());
              this.renderHead();
  
              this.scroller.render();
              var timeGridWrapEl = this.scroller.el.addClass('fc-time-grid-container');
              var timeGridEl = $('<div class="fc-time-grid" />').appendTo(timeGridWrapEl);
              this.el.find('.fc-body > tr > td').append(timeGridWrapEl);
  
              this.timeGrid.setElement(timeGridEl);
              this.timeGrid.renderDates();
  
              // the <hr> that sometimes displays under the time-grid
              this.bottomRuleEl = $('<hr class="fc-divider ' + this.widgetHeaderClass + '"/>')
                  .appendTo(this.timeGrid.el); // inject it into the time-grid
  
              if (this.dayGrid) {
                  this.dayGrid.setElement(this.el.find('.fc-day-grid'));
                  this.dayGrid.renderDates();
  
                  // have the day-grid extend it's coordinate area over the <hr> dividing the two grids
                  this.dayGrid.bottomCoordPadding = this.dayGrid.el.next('hr').outerHeight();
              }
  
              this.noScrollRowEls = this.el.find('.fc-row:not(.fc-scroller *)'); // fake rows not within the scroller
          },
  
  
          // render the day-of-week headers
          renderHead: function () {
              this.headContainerEl =
                  this.el.find('.fc-head-container')
                      .html(this.timeGrid.renderHeadHtml());
          },
  
  
          // Unrenders the content of the view. Since we haven't separated skeleton rendering from date rendering,
          // always completely kill each grid's rendering.
          unrenderDates: function () {
              this.timeGrid.unrenderDates();
              this.timeGrid.removeElement();
  
              if (this.dayGrid) {
                  this.dayGrid.unrenderDates();
                  this.dayGrid.removeElement();
              }
  
              this.scroller.destroy();
          },
  
  
          // Builds the HTML skeleton for the view.
          // The day-grid and time-grid components will render inside containers defined by this HTML.
          renderSkeletonHtml: function () {
              return '' +
                  '<table>' +
                  '<thead class="fc-head">' +
                  '<tr>' +
                  '<td class="fc-head-container ' + this.widgetHeaderClass + '"></td>' +
                  '</tr>' +
                  '</thead>' +
                  '<tbody class="fc-body">' +
                  '<tr>' +
                  '<td class="' + this.widgetContentClass + '">' +
                  (this.dayGrid ?
                          '<div class="fc-day-grid"/>' +
                          '<hr class="fc-divider ' + this.widgetHeaderClass + '"/>' :
                          ''
                  ) +
                  '</td>' +
                  '</tr>' +
                  '</tbody>' +
                  '</table>';
          },
  
  
          // Generates an HTML attribute string for setting the width of the axis, if it is known
          axisStyleAttr: function () {
              if (this.axisWidth !== null) {
                  return 'style="width:' + this.axisWidth + 'px"';
              }
              return '';
          },
  
  
          /* Business Hours
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          renderBusinessHours: function () {
              this.timeGrid.renderBusinessHours();
  
              if (this.dayGrid) {
                  this.dayGrid.renderBusinessHours();
              }
          },
  
  
          unrenderBusinessHours: function () {
              this.timeGrid.unrenderBusinessHours();
  
              if (this.dayGrid) {
                  this.dayGrid.unrenderBusinessHours();
              }
          },
  
  
          /* Now Indicator
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          getNowIndicatorUnit: function () {
              return this.timeGrid.getNowIndicatorUnit();
          },
  
  
          renderNowIndicator: function (date) {
              this.timeGrid.renderNowIndicator(date);
          },
  
  
          unrenderNowIndicator: function () {
              this.timeGrid.unrenderNowIndicator();
          },
  
  
          /* Dimensions
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          updateSize: function (isResize) {
              this.timeGrid.updateSize(isResize);
  
              View.prototype.updateSize.call(this, isResize); // call the super-method
          },
  
  
          // Refreshes the horizontal dimensions of the view
          updateWidth: function () {
              // make all axis cells line up, and record the width so newly created axis cells will have it
              this.axisWidth = matchCellWidths(this.el.find('.fc-axis'));
          },
  
  
          // Adjusts the vertical dimensions of the view to the specified values
          setHeight: function (totalHeight, isAuto) {
              var eventLimit;
              var scrollerHeight;
              var scrollbarWidths;
  
              // reset all dimensions back to the original state
              this.bottomRuleEl.hide(); // .show() will be called later if this <hr> is necessary
              this.scroller.clear(); // sets height to 'auto' and clears overflow
              uncompensateScroll(this.noScrollRowEls);
  
              // limit number of events in the all-day area
              if (this.dayGrid) {
                  this.dayGrid.removeSegPopover(); // kill the "more" popover if displayed
  
                  eventLimit = this.opt('eventLimit');
                  if (eventLimit && typeof eventLimit !== 'number') {
                      eventLimit = AGENDA_ALL_DAY_EVENT_LIMIT; // make sure "auto" goes to a real number
                  }
                  if (eventLimit) {
                      this.dayGrid.limitRows(eventLimit);
                  }
              }
  
              if (!isAuto) { // should we force dimensions of the scroll container?
  
                  scrollerHeight = this.computeScrollerHeight(totalHeight);
                  this.scroller.setHeight(scrollerHeight);
                  scrollbarWidths = this.scroller.getScrollbarWidths();
  
                  if (scrollbarWidths.left || scrollbarWidths.right) { // using scrollbars?
  
                      // make the all-day and header rows lines up
                      compensateScroll(this.noScrollRowEls, scrollbarWidths);
  
                      // the scrollbar compensation might have changed text flow, which might affect height, so recalculate
                      // and reapply the desired height to the scroller.
                      scrollerHeight = this.computeScrollerHeight(totalHeight);
                      this.scroller.setHeight(scrollerHeight);
                  }
  
                  // guarantees the same scrollbar widths
                  this.scroller.lockOverflow(scrollbarWidths);
  
                  // if there's any space below the slats, show the horizontal rule.
                  // this won't cause any new overflow, because lockOverflow already called.
                  if (this.timeGrid.getTotalSlatHeight() < scrollerHeight) {
                      this.bottomRuleEl.show();
                  }
              }
          },
  
  
          // given a desired total height of the view, returns what the height of the scroller should be
          computeScrollerHeight: function (totalHeight) {
              return totalHeight -
                  subtractInnerElHeight(this.el, this.scroller.el); // everything that's NOT the scroller
          },
  
  
          /* Scroll
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Computes the initial pre-configured scroll state prior to allowing the user to change it
          computeInitialScroll: function () {
              var scrollTime = moment.duration(this.opt('scrollTime'));
              var top = this.timeGrid.computeTimeTop(scrollTime);
  
              // zoom can give weird floating-point values. rather scroll a little bit further
              top = Math.ceil(top);
  
              if (top) {
                  top++; // to overcome top border that slots beyond the first have. looks better
              }
  
              return {top: top};
          },
  
  
          queryScroll: function () {
              return {top: this.scroller.getScrollTop()};
          },
  
  
          setScroll: function (scroll) {
              this.scroller.setScrollTop(scroll.top);
          },
  
  
          /* Hit Areas
  	------------------------------------------------------------------------------------------------------------------*/
          // forward all hit-related method calls to the grids (dayGrid might not be defined)
  
  
          hitsNeeded: function () {
              this.timeGrid.hitsNeeded();
              if (this.dayGrid) {
                  this.dayGrid.hitsNeeded();
              }
          },
  
  
          hitsNotNeeded: function () {
              this.timeGrid.hitsNotNeeded();
              if (this.dayGrid) {
                  this.dayGrid.hitsNotNeeded();
              }
          },
  
  
          prepareHits: function () {
              this.timeGrid.prepareHits();
              if (this.dayGrid) {
                  this.dayGrid.prepareHits();
              }
          },
  
  
          releaseHits: function () {
              this.timeGrid.releaseHits();
              if (this.dayGrid) {
                  this.dayGrid.releaseHits();
              }
          },
  
  
          queryHit: function (left, top) {
              var hit = this.timeGrid.queryHit(left, top);
  
              if (!hit && this.dayGrid) {
                  hit = this.dayGrid.queryHit(left, top);
              }
  
              return hit;
          },
  
  
          getHitSpan: function (hit) {
              // TODO: hit.component is set as a hack to identify where the hit came from
              return hit.component.getHitSpan(hit);
          },
  
  
          getHitEl: function (hit) {
              // TODO: hit.component is set as a hack to identify where the hit came from
              return hit.component.getHitEl(hit);
          },
  
  
          /* Events
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders events onto the view and populates the View's segment array
          renderEvents: function (events) {
              var dayEvents = [];
              var timedEvents = [];
              var daySegs = [];
              var timedSegs;
              var i;
  
              // separate the events into all-day and timed
              for (i = 0; i < events.length; i++) {
                  if (events[i].allDay) {
                      dayEvents.push(events[i]);
                  }
                  else {
                      timedEvents.push(events[i]);
                  }
              }
  
              // render the events in the subcomponents
              timedSegs = this.timeGrid.renderEvents(timedEvents);
              if (this.dayGrid) {
                  daySegs = this.dayGrid.renderEvents(dayEvents);
              }
  
              // the all-day area is flexible and might have a lot of events, so shift the height
              this.updateHeight();
          },
  
  
          // Retrieves all segment objects that are rendered in the view
          getEventSegs: function () {
              return this.timeGrid.getEventSegs().concat(
                  this.dayGrid ? this.dayGrid.getEventSegs() : []
              );
          },
  
  
          // Unrenders all event elements and clears internal segment data
          unrenderEvents: function () {
  
              // unrender the events in the subcomponents
              this.timeGrid.unrenderEvents();
              if (this.dayGrid) {
                  this.dayGrid.unrenderEvents();
              }
  
              // we DON'T need to call updateHeight() because
              // a renderEvents() call always happens after this, which will eventually call updateHeight()
          },
  
  
          /* Dragging (for events and external elements)
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // A returned value of `true` signals that a mock "helper" event has been rendered.
          renderDrag: function (dropLocation, seg) {
              if (dropLocation.start.hasTime()) {
                  return this.timeGrid.renderDrag(dropLocation, seg);
              }
              else if (this.dayGrid) {
                  return this.dayGrid.renderDrag(dropLocation, seg);
              }
          },
  
  
          unrenderDrag: function () {
              this.timeGrid.unrenderDrag();
              if (this.dayGrid) {
                  this.dayGrid.unrenderDrag();
              }
          },
  
  
          /* Selection
  	------------------------------------------------------------------------------------------------------------------*/
  
  
          // Renders a visual indication of a selection
          renderSelection: function (span) {
              if (span.start.hasTime() || span.end.hasTime()) {
                  this.timeGrid.renderSelection(span);
              }
              else if (this.dayGrid) {
                  this.dayGrid.renderSelection(span);
              }
          },
  
  
          // Unrenders a visual indications of a selection
          unrenderSelection: function () {
              this.timeGrid.unrenderSelection();
              if (this.dayGrid) {
                  this.dayGrid.unrenderSelection();
              }
          }
  
      });
  
  
  // Methods that will customize the rendering behavior of the AgendaView's timeGrid
  // TODO: move into TimeGrid
      var agendaTimeGridMethods = {
  
  
          // Generates the HTML that will go before the day-of week header cells
          renderHeadIntroHtml: function () {
              var view = this.view;
              var weekText;
  
              if (view.opt('weekNumbers')) {
                  weekText = this.start.format(view.opt('smallWeekFormat'));
  
                  return '' +
                      '<th class="fc-axis fc-week-number ' + view.widgetHeaderClass + '" ' + view.axisStyleAttr() + '>' +
                      view.buildGotoAnchorHtml( // aside from link, important for matchCellWidths
                          {date: this.start, type: 'week', forceOff: this.colCnt > 1},
                          htmlEscape(weekText) // inner HTML
                      ) +
                      '</th>';
              }
              else {
                  return '<th class="fc-axis ' + view.widgetHeaderClass + '" ' + view.axisStyleAttr() + '></th>';
              }
          },
  
  
          // Generates the HTML that goes before the bg of the TimeGrid slot area. Long vertical column.
          renderBgIntroHtml: function () {
              var view = this.view;
  
              return '<td class="fc-axis ' + view.widgetContentClass + '" ' + view.axisStyleAttr() + '></td>';
          },
  
  
          // Generates the HTML that goes before all other types of cells.
          // Affects content-skeleton, helper-skeleton, highlight-skeleton for both the time-grid and day-grid.
          renderIntroHtml: function () {
              var view = this.view;
  
              return '<td class="fc-axis" ' + view.axisStyleAttr() + '></td>';
          }
  
      };
  
  
  // Methods that will customize the rendering behavior of the AgendaView's dayGrid
      var agendaDayGridMethods = {
  
  
          // Generates the HTML that goes before the all-day cells
          renderBgIntroHtml: function () {
              var view = this.view;
  
              return '' +
                  '<td class="fc-axis ' + view.widgetContentClass + '" ' + view.axisStyleAttr() + '>' +
                  '<span>' + // needed for matchCellWidths
                  view.getAllDayHtml() +
                  '</span>' +
                  '</td>';
          },
  
  
          // Generates the HTML that goes before all other types of cells.
          // Affects content-skeleton, helper-skeleton, highlight-skeleton for both the time-grid and day-grid.
          renderIntroHtml: function () {
              var view = this.view;
  
              return '<td class="fc-axis" ' + view.axisStyleAttr() + '></td>';
          }
  
      };
  
      ;
      ;
  
      var AGENDA_ALL_DAY_EVENT_LIMIT = 5;
  
  // potential nice values for the slot-duration and interval-duration
  // from largest to smallest
      var AGENDA_STOCK_SUB_DURATIONS = [
          {hours: 1},
          {minutes: 30},
          {minutes: 15},
          {seconds: 30},
          {seconds: 15}
      ];
  
      fcViews.agenda = {
          'class': AgendaView,
          defaults: {
              allDaySlot: true,
              slotDuration: '00:30:00',
              minTime: '00:00:00',
              maxTime: '24:00:00',
              slotEventOverlap: true // a bad name. confused with overlap/constraint system
          }
      };
  
      fcViews.agendaDay = {
          type: 'agenda',
          duration: {days: 1}
      };
  
      fcViews.agendaWeek = {
          type: 'agenda',
          duration: {weeks: 1}
      };
      ;
      ;
  
      /*
  Responsible for the scroller, and forwarding event-related actions into the "grid"
  */
      var ListView = View.extend({
  
          grid: null,
          scroller: null,
  
          initialize: function () {
              this.grid = new ListViewGrid(this);
              this.scroller = new Scroller({
                  overflowX: 'hidden',
                  overflowY: 'auto'
              });
          },
  
          setRange: function (range) {
              View.prototype.setRange.call(this, range); // super
  
              this.grid.setRange(range); // needs to process range-related options
          },
  
          renderSkeleton: function () {
              this.el.addClass(
                  'fc-list-view ' +
                  this.widgetContentClass
              );
  
              this.scroller.render();
              this.scroller.el.appendTo(this.el);
  
              this.grid.setElement(this.scroller.scrollEl);
          },
  
          unrenderSkeleton: function () {
              this.scroller.destroy(); // will remove the Grid too
          },
  
          setHeight: function (totalHeight, isAuto) {
              this.scroller.setHeight(this.computeScrollerHeight(totalHeight));
          },
  
          computeScrollerHeight: function (totalHeight) {
              return totalHeight -
                  subtractInnerElHeight(this.el, this.scroller.el); // everything that's NOT the scroller
          },
  
          renderEvents: function (events) {
              this.grid.renderEvents(events);
          },
  
          unrenderEvents: function () {
              this.grid.unrenderEvents();
          },
  
          isEventResizable: function (event) {
              return false;
          },
  
          isEventDraggable: function (event) {
              return false;
          }
  
      });
  
      /*
  Responsible for event rendering and user-interaction.
  Its "el" is the inner-content of the above view's scroller.
  */
      var ListViewGrid = Grid.extend({
  
          segSelector: '.fc-list-item', // which elements accept event actions
          hasDayInteractions: false, // no day selection or day clicking
  
          // slices by day
          spanToSegs: function (span) {
              var view = this.view;
              var dayStart = view.start.clone().time(0); // timed, so segs get times!
              var dayIndex = 0;
              var seg;
              var segs = [];
  
              while (dayStart < view.end) {
  
                  seg = intersectRanges(span, {
                      start: dayStart,
                      end: dayStart.clone().add(1, 'day')
                  });
  
                  if (seg) {
                      seg.dayIndex = dayIndex;
                      segs.push(seg);
                  }
  
                  dayStart.add(1, 'day');
                  dayIndex++;
  
                  // detect when span won't go fully into the next day,
                  // and mutate the latest seg to the be the end.
                  if (
                      seg && !seg.isEnd && span.end.hasTime() &&
                      span.end < dayStart.clone().add(this.view.nextDayThreshold)
                  ) {
                      seg.end = span.end.clone();
                      seg.isEnd = true;
                      break;
                  }
              }
  
              return segs;
          },
  
          // like "4:00am"
          computeEventTimeFormat: function () {
              return this.view.opt('mediumTimeFormat');
          },
  
          // for events with a url, the whole <tr> should be clickable,
          // but it's impossible to wrap with an <a> tag. simulate this.
          handleSegClick: function (seg, ev) {
              var url;
  
              Grid.prototype.handleSegClick.apply(this, arguments); // super. might prevent the default action
  
              // not clicking on or within an <a> with an href
              if (!$(ev.target).closest('a[href]').length) {
                  url = seg.event.url;
                  if (url && !ev.isDefaultPrevented()) { // jsEvent not cancelled in handler
                      window.location.href = url; // simulate link click
                  }
              }
          },
  
          // returns list of foreground segs that were actually rendered
          renderFgSegs: function (segs) {
              segs = this.renderFgSegEls(segs); // might filter away hidden events
  
              if (!segs.length) {
                  this.renderEmptyMessage();
              }
              else {
                  this.renderSegList(segs);
              }
  
              return segs;
          },
  
          renderEmptyMessage: function () {
              this.el.html(
                  '<div class="fc-list-empty-wrap2">' + // TODO: try less wraps
                  '<div class="fc-list-empty-wrap1">' +
                  '<div class="fc-list-empty">' +
                  htmlEscape(this.view.opt('noEventsMessage')) +
                  '</div>' +
                  '</div>' +
                  '</div>'
              );
          },
  
          // render the event segments in the view
          renderSegList: function (allSegs) {
              var segsByDay = this.groupSegsByDay(allSegs); // sparse array
              var dayIndex;
              var daySegs;
              var i;
              var tableEl = $('<table class="fc-list-table"><tbody/></table>');
              var tbodyEl = tableEl.find('tbody');
  
              for (dayIndex = 0; dayIndex < segsByDay.length; dayIndex++) {
                  daySegs = segsByDay[dayIndex];
                  if (daySegs) { // sparse array, so might be undefined
  
                      // append a day header
                      tbodyEl.append(this.dayHeaderHtml(
                          this.view.start.clone().add(dayIndex, 'days')
                      ));
  
                      this.sortEventSegs(daySegs);
  
                      for (i = 0; i < daySegs.length; i++) {
                          tbodyEl.append(daySegs[i].el); // append event row
                      }
                  }
              }
  
              this.el.empty().append(tableEl);
          },
  
          // Returns a sparse array of arrays, segs grouped by their dayIndex
          groupSegsByDay: function (segs) {
              var segsByDay = []; // sparse array
              var i, seg;
  
              for (i = 0; i < segs.length; i++) {
                  seg = segs[i];
                  (segsByDay[seg.dayIndex] || (segsByDay[seg.dayIndex] = []))
                      .push(seg);
              }
  
              return segsByDay;
          },
  
          // generates the HTML for the day headers that live amongst the event rows
          dayHeaderHtml: function (dayDate) {
              var view = this.view;
              var mainFormat = view.opt('listDayFormat');
              var altFormat = view.opt('listDayAltFormat');
  
              return '<tr class="fc-list-heading" data-date="' + dayDate.format('YYYY-MM-DD') + '">' +
                  '<td class="' + view.widgetHeaderClass + '" colspan="3">' +
                  (mainFormat ?
                      view.buildGotoAnchorHtml(
                          dayDate,
                          {'class': 'fc-list-heading-main'},
                          htmlEscape(dayDate.format(mainFormat)) // inner HTML
                      ) :
                      '') +
                  (altFormat ?
                      view.buildGotoAnchorHtml(
                          dayDate,
                          {'class': 'fc-list-heading-alt'},
                          htmlEscape(dayDate.format(altFormat)) // inner HTML
                      ) :
                      '') +
                  '</td>' +
                  '</tr>';
          },
  
          // generates the HTML for a single event row
          fgSegHtml: function (seg) {
              var view = this.view;
              var classes = ['fc-list-item'].concat(this.getSegCustomClasses(seg));
              var bgColor = this.getSegBackgroundColor(seg);
              var event = seg.event;
              var url = event.url;
              var timeHtml;
  
              if (event.allDay) {
                  timeHtml = view.getAllDayHtml();
              }
              else if (view.isMultiDayEvent(event)) { // if the event appears to span more than one day
                  if (seg.isStart || seg.isEnd) { // outer segment that probably lasts part of the day
                      timeHtml = htmlEscape(this.getEventTimeText(seg));
                  }
                  else { // inner segment that lasts the whole day
                      timeHtml = view.getAllDayHtml();
                  }
              }
              else {
                  // Display the normal time text for the *event's* times
                  timeHtml = htmlEscape(this.getEventTimeText(event));
              }
  
              if (url) {
                  classes.push('fc-has-url');
              }
  
              return '<tr class="' + classes.join(' ') + '">' +
                  (this.displayEventTime ?
                      '<td class="fc-list-item-time ' + view.widgetContentClass + '">' +
                      (timeHtml || '') +
                      '</td>' :
                      '') +
                  '<td class="fc-list-item-marker ' + view.widgetContentClass + '">' +
                  '<span class="fc-event-dot"' +
                  (bgColor ?
                      ' style="background-color:' + bgColor + '"' :
                      '') +
                  '></span>' +
                  '</td>' +
                  '<td class="fc-list-item-title ' + view.widgetContentClass + '">' +
                  '<a' + (url ? ' href="' + htmlEscape(url) + '"' : '') + '>' +
                  htmlEscape(seg.event.title || '') +
                  '</a>' +
                  '</td>' +
                  '</tr>';
          }
  
      });
  
      ;
      ;
  
      fcViews.list = {
          'class': ListView,
          buttonTextKey: 'list', // what to lookup in locale files
          defaults: {
              buttonText: 'list', // text to display for English
              listDayFormat: 'LL', // like "January 1, 2016"
              noEventsMessage: 'No events to display'
          }
      };
  
      fcViews.listDay = {
          type: 'list',
          duration: {days: 1},
          defaults: {
              listDayFormat: 'dddd' // day-of-week is all we need. full date is probably in header
          }
      };
  
      fcViews.listWeek = {
          type: 'list',
          duration: {weeks: 1},
          defaults: {
              listDayFormat: 'dddd', // day-of-week is more important
              listDayAltFormat: 'LL'
          }
      };
  
      fcViews.listMonth = {
          type: 'list',
          duration: {month: 1},
          defaults: {
              listDayAltFormat: 'dddd' // day-of-week is nice-to-have
          }
      };
  
      fcViews.listYear = {
          type: 'list',
          duration: {year: 1},
          defaults: {
              listDayAltFormat: 'dddd' // day-of-week is nice-to-have
          }
      };
  
      ;
      ;
  
      return FC; // export for Node/CommonJS
  });