text: /*!
   * FullCalendar v2.4.0
   * Docs & License: http://fullcalendar.io/
   * (c) 2015 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: "2.4.0" };
  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',
  	'buttonText',
  	'buttonIcons',
  	'themeButtonIcons'
  ];
  
  
  // Merges an array of option objects into a single object
  function mergeOptions(optionObjs) {
  	return mergeProps(optionObjs, complexOptions);
  }
  
  
  // Given options specified for the calendar's constructor, massages any legacy options into a non-legacy form.
  // Converts View-Option-Hashes into the View-Specific-Options format.
  function massageOverrides(input) {
  	var overrides = { views: input.views || {} }; // the output. ensure a `views` hash
  	var subObj;
  
  	// iterate through all option override properties (except `views`)
  	$.each(input, function(name, val) {
  		if (name != 'views') {
  
  			// could the value be a legacy View-Option-Hash?
  			if (
  				$.isPlainObject(val) &&
  				!/(time|duration|interval)$/i.test(name) && // exclude duration options. might be given as objects
  				$.inArray(name, complexOptions) == -1 // complex options aren't allowed to be View-Option-Hashes
  			) {
  				subObj = null;
  
  				// iterate through the properties of this possible View-Option-Hash value
  				$.each(val, function(subName, subVal) {
  
  					// is the property targeting a view?
  					if (/^(month|week|day|default|basic(Week|Day)?|agenda(Week|Day)?)$/.test(subName)) {
  						if (!overrides.views[subName]) { // ensure the view-target entry exists
  							overrides.views[subName] = {};
  						}
  						overrides.views[subName][name] = subVal; // record the value in the `views` object
  					}
  					else { // a non-View-Option-Hash property
  						if (!subObj) {
  							subObj = {};
  						}
  						subObj[subName] = subVal; // accumulate these unrelated values for later
  					}
  				});
  
  				if (subObj) { // non-View-Option-Hash properties? transfer them as-is
  					overrides[name] = subObj;
  				}
  			}
  			else {
  				overrides[name] = val; // transfer normal options as-is
  			}
  		}
  	});
  
  	return overrides;
  }
  
  ;;
  
  // exports
  fc.intersectionToSeg = intersectionToSeg;
  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;
  }
  
  
  // Turns a container element into a scroller if its contents is taller than the allotted height.
  // Returns true if the element is now a scroller, false otherwise.
  // NOTE: this method is best because it takes weird zooming dimensions into account
  function setPotentialScroller(containerEl, height) {
  	containerEl.height(height).addClass('fc-scroller');
  
  	// are scrollbars needed?
  	if (containerEl[0].scrollHeight - 1 > containerEl[0].clientHeight) { // !!! -1 because IE is often off-by-one :(
  		return true;
  	}
  
  	unsetScroller(containerEl); // undo
  	return false;
  }
  
  
  // Takes an element that might have been a scroller, and turns it back into a normal element.
  function unsetScroller(containerEl) {
  	containerEl.height('').removeClass('fc-scroller');
  }
  
  
  /* General DOM Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
  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).
  function getOuterRect(el) {
  	var offset = el.offset();
  
  	return {
  		left: offset.left,
  		right: offset.left + el.outerWidth(),
  		top: offset.top,
  		bottom: offset.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).
  // NOTE: should use clientLeft/clientTop, but very unreliable cross-browser.
  function getClientRect(el) {
  	var offset = el.offset();
  	var scrollbarWidths = getScrollbarWidths(el);
  	var left = offset.left + getCssFloat(el, 'border-left-width') + scrollbarWidths.left;
  	var top = offset.top + getCssFloat(el, 'border-top-width') + scrollbarWidths.top;
  
  	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).
  function getContentRect(el) {
  	var offset = el.offset(); // just outside of border, margin not included
  	var left = offset.left + getCssFloat(el, 'border-left-width') + getCssFloat(el, 'padding-left');
  	var top = offset.top + getCssFloat(el, 'border-top-width') + getCssFloat(el, 'padding-top');
  
  	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 widths = {
  		left: 0,
  		right: 0,
  		top: 0,
  		bottom: el.innerHeight() - el[0].clientHeight // the paddings cancel out, leaving the bottom scrollbar
  	};
  
  	if (getIsLeftRtlScrollbars() && el.css('direction') == 'rtl') { // is the scrollbar on the left side?
  		widths.left = leftRightWidth;
  	}
  	else {
  		widths.right = leftRightWidth;
  	}
  
  	return widths;
  }
  
  
  // 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;
  }
  
  
  // 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;
  }
  
  
  /* Geometry
  ----------------------------------------------------------------------------------------------------------------------*/
  
  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
  ----------------------------------------------------------------------------------------------------------------------*/
  
  
  // Creates a basic segment with the intersection of the two ranges. Returns undefined if no intersection.
  // Expects all dates to be normalized to the same timezone beforehand.
  // TODO: move to date section?
  function intersectionToSeg(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();
  }
  
  
  function copyOwnProps(src, dest) {
  	for (var name in src) {
  		if (hasOwnProp(src, name)) {
  			dest[name] = src[name];
  		}
  	}
  }
  
  
  // Copies over certain methods with the same names as Object.prototype methods. Overcomes an IE<=8 bug:
  // https://developer.mozilla.org/en-US/docs/ECMAScript_DontEnum_attribute#JScript_DontEnum_Bug
  function copyNativeMethods(src, dest) {
  	var names = [ 'constructor', 'toString', 'valueOf' ];
  	var i, name;
  
  	for (i = 0; i < names.length; i++) {
  		name = names[i];
  
  		if (src[name] !== Object.prototype[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(';');
  }
  
  
  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.
  // https://github.com/jashkenas/underscore/blob/1.6.0/underscore.js#L714
  function debounce(func, wait) {
  	var timeoutId;
  	var args;
  	var context;
  	var timestamp; // of most recent call
  	var later = function() {
  		var last = +new Date() - timestamp;
  		if (last < wait && last > 0) {
  			timeoutId = setTimeout(later, wait - last);
  		}
  		else {
  			timeoutId = null;
  			func.apply(context, args);
  			if (!timeoutId) {
  				context = args = null;
  			}
  		}
  	};
  
  	return function() {
  		context = this;
  		args = arguments;
  		timestamp = +new Date();
  		if (!timeoutId) {
  			timeoutId = setTimeout(later, wait);
  		}
  	};
  }
  
  ;;
  
  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
  var allowValueOptimization;
  var setUTCValues; // function defined below
  var setLocalValues; // function defined below
  
  
  // 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)) {
  		mom = moment.apply(null, args); // clone it
  		transferAmbigs(input, mom); // the ambig flags weren't transfered with the clone
  	}
  	else if (isNativeDate(input) || input === undefined) {
  		mom = moment.apply(null, args); // will be local
  	}
  	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) {
  				if (mom.utcOffset) {
  					mom.utcOffset(input); // if not a valid zone, will assign UTC
  				}
  				else {
  					mom.zone(input); // for moment-pre-2.9
  				}
  			}
  		}
  	}
  
  	mom._fullCalendar = true; // flag for extended functionality
  
  	return mom;
  }
  
  
  // A clone method that works with the flags related to our enhanced functionality.
  // In the future, use moment.momentProperties
  newMomentProto.clone = function() {
  	var mom = oldMomentProto.clone.apply(this, arguments);
  
  	// these flags weren't transfered with the clone
  	transferAmbigs(this, mom);
  	if (this._fullCalendar) {
  		mom._fullCalendar = true;
  	}
  
  	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 || this._lang) // works pre-moment-2.8
  		._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() {
  	var a;
  
  	if (!this._ambigTime) {
  
  		// get the values before any conversion happens
  		a = this.toArray(); // array of y/m/d/h/m/s/ms
  
  		// TODO: use keepLocalTime in the future
  		this.utc(); // set the internal UTC flag (will clear the ambig flags)
  		setUTCValues(this, a.slice(0, 3)); // set the year/month/date. time will be zero
  
  		// Mark the time as ambiguous. This needs to happen after the .utc() call, which might call .utcOffset(),
  		// which clears all ambig flags. Same with setUTCValues with moment-timezone.
  		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.
  // TODO: look into Moment's keepLocalTime functionality
  newMomentProto.stripZone = function() {
  	var a, wasAmbigTime;
  
  	if (!this._ambigZone) {
  
  		// get the values before any conversion happens
  		a = this.toArray(); // array of y/m/d/h/m/s/ms
  		wasAmbigTime = this._ambigTime;
  
  		this.utc(); // set the internal UTC flag (might clear the ambig flags, depending on Moment internals)
  		setUTCValues(this, a); // will set the year/month/date/hours/minutes/seconds/ms
  
  		// 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. Same with setUTCValues with moment-timezone.
  		this._ambigZone = true;
  	}
  
  	return this; // for chaining
  };
  
  // Returns of the moment has a non-ambiguous timezone offset (boolean)
  newMomentProto.hasZone = function() {
  	return !this._ambigZone;
  };
  
  
  // this method implicitly marks a zone
  newMomentProto.local = function() {
  	var a = this.toArray(); // year,month,date,hours,minutes,seconds,ms as an array
  	var wasAmbigZone = this._ambigZone;
  
  	oldMomentProto.local.apply(this, arguments);
  
  	// ensure non-ambiguous
  	// this probably already happened via local() -> utcOffset(), but don't rely on Moment's internals
  	this._ambigTime = false;
  	this._ambigZone = false;
  
  	if (wasAmbigZone) {
  		// If the moment was ambiguously zoned, the date fields were stored as UTC.
  		// We want to preserve these, but in local time.
  		// TODO: look into Moment's keepLocalTime functionality
  		setLocalValues(this, a);
  	}
  
  	return this; // for chaining
  };
  
  
  // implicitly marks a zone
  newMomentProto.utc = function() {
  	oldMomentProto.utc.apply(this, arguments);
  
  	// 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;
  };
  
  
  // methods for arbitrarily manipulating timezone offset.
  // should clear time/zone ambiguity when called.
  $.each([
  	'zone', // only in moment-pre-2.9. deprecated afterwards
  	'utcOffset'
  ], function(i, name) {
  	if (oldMomentProto[name]) { // original method exists?
  
  		// this method implicitly marks a zone (will probably get called upon .utc() and .local())
  		newMomentProto[name] = 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[name].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);
  };
  
  
  // Querying
  // -------------------------------------------------------------------------------------------------
  
  // Is the moment within the specified range? `end` is exclusive.
  // FYI, this method is not a standard Moment method, so always do our enhanced logic.
  newMomentProto.isWithin = function(start, end) {
  	var a = commonlyAmbiguate([ this, start, end ]);
  	return a[0] >= a[1] && a[0] < a[2];
  };
  
  // When isSame is called with units, timezone ambiguity is normalized before the comparison happens.
  // If no units specified, the two moments must be identically the same, with matching ambig flags.
  newMomentProto.isSame = function(input, units) {
  	var a;
  
  	// only do custom logic if this is an enhanced moment
  	if (!this._fullCalendar) {
  		return oldMomentProto.isSame.apply(this, arguments);
  	}
  
  	if (units) {
  		a = commonlyAmbiguate([ this, input ], true); // normalize timezones but don't erase times
  		return oldMomentProto.isSame.call(a[0], a[1], units);
  	}
  	else {
  		input = fc.moment.parseZone(input); // normalize input
  		return oldMomentProto.isSame.call(this, input) &&
  			Boolean(this._ambigTime) === Boolean(input._ambigTime) &&
  			Boolean(this._ambigZone) === Boolean(input._ambigZone);
  	}
  };
  
  // Make these query methods work with ambiguous moments
  $.each([
  	'isBefore',
  	'isAfter'
  ], function(i, methodName) {
  	newMomentProto[methodName] = function(input, units) {
  		var a;
  
  		// only do custom logic if this is an enhanced moment
  		if (!this._fullCalendar) {
  			return oldMomentProto[methodName].apply(this, arguments);
  		}
  
  		a = commonlyAmbiguate([ this, input ]);
  		return oldMomentProto[methodName].call(a[0], a[1], units);
  	};
  });
  
  
  // Misc Internals
  // -------------------------------------------------------------------------------------------------
  
  // given an array of moment-like inputs, return a parallel array w/ moments similarly ambiguated.
  // for example, of one moment has ambig time, but not others, all moments will have their time stripped.
  // set `preserveTime` to `true` to keep times, but only normalize zone ambiguity.
  // returns the original moments if no modifications are necessary.
  function commonlyAmbiguate(inputs, preserveTime) {
  	var anyAmbigTime = false;
  	var anyAmbigZone = false;
  	var len = inputs.length;
  	var moms = [];
  	var i, mom;
  
  	// parse inputs into real moments and query their ambig flags
  	for (i = 0; i < len; i++) {
  		mom = inputs[i];
  		if (!moment.isMoment(mom)) {
  			mom = fc.moment.parseZone(mom);
  		}
  		anyAmbigTime = anyAmbigTime || mom._ambigTime;
  		anyAmbigZone = anyAmbigZone || mom._ambigZone;
  		moms.push(mom);
  	}
  
  	// strip each moment down to lowest common ambiguity
  	// use clones to avoid modifying the original moments
  	for (i = 0; i < len; i++) {
  		mom = moms[i];
  		if (!preserveTime && anyAmbigTime && !mom._ambigTime) {
  			moms[i] = mom.clone().stripTime();
  		}
  		else if (anyAmbigZone && !mom._ambigZone) {
  			moms[i] = mom.clone().stripZone();
  		}
  	}
  
  	return moms;
  }
  
  // Transfers all the flags related to ambiguous time/zone from the `src` moment to the `dest` moment
  // TODO: look into moment.momentProperties for this.
  function transferAmbigs(src, dest) {
  	if (src._ambigTime) {
  		dest._ambigTime = true;
  	}
  	else if (dest._ambigTime) {
  		dest._ambigTime = false;
  	}
  
  	if (src._ambigZone) {
  		dest._ambigZone = true;
  	}
  	else if (dest._ambigZone) {
  		dest._ambigZone = false;
  	}
  }
  
  
  // Sets the year/month/date/etc values of the moment from the given array.
  // Inefficient because it calls each individual setter.
  function setMomentValues(mom, a) {
  	mom.year(a[0] || 0)
  		.month(a[1] || 0)
  		.date(a[2] || 0)
  		.hours(a[3] || 0)
  		.minutes(a[4] || 0)
  		.seconds(a[5] || 0)
  		.milliseconds(a[6] || 0);
  }
  
  // Can we set the moment's internal date directly?
  allowValueOptimization = '_d' in moment() && 'updateOffset' in moment;
  
  // Utility function. Accepts a moment and an array of the UTC year/month/date/etc values to set.
  // Assumes the given moment is already in UTC mode.
  setUTCValues = allowValueOptimization ? function(mom, a) {
  	// simlate what moment's accessors do
  	mom._d.setTime(Date.UTC.apply(Date, a));
  	moment.updateOffset(mom, false); // keepTime=false
  } : setMomentValues;
  
  // Utility function. Accepts a moment and an array of the local year/month/date/etc values to set.
  // Assumes the given moment is already in local mode.
  setLocalValues = allowValueOptimization ? function(mom, a) {
  	// simlate what moment's accessors do
  	mom._d.setTime(+new Date( // FYI, there is now way to apply an array of args to a constructor
  		a[0] || 0,
  		a[1] || 0,
  		a[2] || 0,
  		a[3] || 0,
  		a[4] || 0,
  		a[5] || 0,
  		a[6] || 0
  	));
  	moment.updateOffset(mom, false); // keepTime=false
  } : setMomentValues;
  
  ;;
  
  // Single Date Formatting
  // -------------------------------------------------------------------------------------------------
  
  
  // 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
  }
  
  
  // Formats `date` with a Moment formatting string, but allow our non-zero areas and
  // additional token.
  function formatDate(date, formatStr) {
  	return formatDateWithChunks(date, getFormatStringChunks(formatStr));
  }
  
  
  function formatDateWithChunks(date, chunks) {
  	var s = '';
  	var i;
  
  	for (i=0; i<chunks.length; i++) {
  		s += formatDateWithChunk(date, chunks[i]);
  	}
  
  	return s;
  }
  
  
  // addition formatting tokens we want recognized
  var tokenOverrides = {
  	t: function(date) { // "a" or "p"
  		return oldMomentFormat(date, 'a').charAt(0);
  	},
  	T: function(date) { // "A" or "P"
  		return oldMomentFormat(date, 'A').charAt(0);
  	}
  };
  
  
  function formatDateWithChunk(date, chunk) {
  	var token;
  	var maybeStr;
  
  	if (typeof chunk === 'string') { // a literal string
  		return chunk;
  	}
  	else if ((token = chunk.token)) { // a token, like "YYYY"
  		if (tokenOverrides[token]) {
  			return tokenOverrides[token](date); // use our custom token
  		}
  		return oldMomentFormat(date, token);
  	}
  	else if (chunk.maybe) { // a grouping of other chunks that must be non-zero
  		maybeStr = formatDateWithChunks(date, chunk.maybe);
  		if (maybeStr.match(/[1-9]/)) {
  			return maybeStr;
  		}
  	}
  
  	return '';
  }
  
  
  // 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 || date1.lang).call(date1); // works with moment-pre-2.8
  
  	// Expand localized format strings, like "LL" -> "MMMM D YYYY"
  	formatStr = localeData.longDateFormat(formatStr) || formatStr;
  	// 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.
  
  	separator = separator || ' - ';
  
  	return formatRangeWithChunks(
  		date1,
  		date2,
  		getFormatStringChunks(formatStr),
  		separator,
  		isRTL
  	);
  }
  fc.formatRange = formatRange; // expose
  
  
  function formatRangeWithChunks(date1, date2, chunks, separator, isRTL) {
  	var chunkStr; // the rendering of the chunk
  	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<chunks.length; leftI++) {
  		chunkStr = formatSimilarChunk(date1, date2, chunks[leftI]);
  		if (chunkStr === false) {
  			break;
  		}
  		leftStr += chunkStr;
  	}
  
  	// Similarly, start at the rightmost side of the formatting string and move left
  	for (rightI=chunks.length-1; rightI>leftI; rightI--) {
  		chunkStr = formatSimilarChunk(date1, date2, chunks[rightI]);
  		if (chunkStr === false) {
  			break;
  		}
  		rightStr = chunkStr + 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 += formatDateWithChunk(date1, chunks[middleI]);
  		middleStr2 += formatDateWithChunk(date2, chunks[middleI]);
  	}
  
  	if (middleStr1 || middleStr2) {
  		if (isRTL) {
  			middleStr = middleStr2 + separator + middleStr1;
  		}
  		else {
  			middleStr = middleStr1 + separator + middleStr2;
  		}
  	}
  
  	return leftStr + middleStr + rightStr;
  }
  
  
  var similarUnitMap = {
  	Y: 'year',
  	M: 'month',
  	D: 'day', // day of month
  	d: 'day', // day of week
  	// prevents a separator between anything time-related...
  	A: 'second', // AM/PM
  	a: 'second', // am/pm
  	T: 'second', // A/P
  	t: 'second', // a/p
  	H: 'second', // hour (24)
  	h: 'second', // hour (12)
  	m: 'second', // minute
  	s: 'second' // second
  };
  // TODO: week maybe?
  
  
  // Given a formatting chunk, and given that both dates are similar in the regard the
  // formatting chunk is concerned, format date1 against `chunk`. Otherwise, return `false`.
  function formatSimilarChunk(date1, date2, chunk) {
  	var token;
  	var unit;
  
  	if (typeof chunk === 'string') { // a literal string
  		return chunk;
  	}
  	else if ((token = chunk.token)) {
  		unit = similarUnitMap[token.charAt(0)];
  		// are the dates the same for this unit of measurement?
  		if (unit && date1.isSame(date2, unit)) {
  			return oldMomentFormat(date1, token); // would be the same if we used `date2`
  			// BTW, don't support custom tokens
  		}
  	}
  
  	return false; // the chunk is NOT the same for the two dates
  	// BTW, don't support splitting on non-zero areas
  }
  
  
  // Chunking Utils
  // -------------------------------------------------------------------------------------------------
  
  
  var formatStringChunkCache = {};
  
  
  function getFormatStringChunks(formatStr) {
  	if (formatStr in formatStringChunkCache) {
  		return formatStringChunkCache[formatStr];
  	}
  	return (formatStringChunkCache[formatStr] = chunkFormatString(formatStr));
  }
  
  
  // Break the formatting string into an array of chunks
  function chunkFormatString(formatStr) {
  	var chunks = [];
  	var chunker = /\[([^\]]*)\]|\(([^\)]*)\)|(LTS|LT|(\w)\4*o?)|([^\w\[\(]+)/g; // TODO: more descrimination
  	var match;
  
  	while ((match = chunker.exec(formatStr))) {
  		if (match[1]) { // a literal string inside [ ... ]
  			chunks.push(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(match[5]);
  		}
  	}
  
  	return chunks;
  }
  
  ;;
  
  fc.Class = Class; // export
  
  // class that all other classes will inherit from
  function Class() { }
  
  // called upon a class to create a subclass
  Class.extend = function(members) {
  	var superClass = this;
  	var subClass;
  
  	members = members || {};
  
  	// 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);
  	copyNativeMethods(members, subClass.prototype); // hack for IE8
  
  	// copy over all class variables/methods to the subclass, such as `extend` and `mixin`
  	copyOwnProps(superClass, subClass);
  
  	return subClass;
  };
  
  // 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) {
  	copyOwnProps(members.prototype || members, this.prototype); // TODO: copyNativeMethods?
  };
  ;;
  
  var Emitter = fc.Emitter = Class.extend({
  
  	callbackHash: null,
  
  
  	on: function(name, callback) {
  		this.getCallbacks(name).add(callback);
  		return this; // for chaining
  	},
  
  
  	off: function(name, callback) {
  		this.getCallbacks(name).remove(callback);
  		return this; // for chaining
  	},
  
  
  	trigger: function(name) { // args...
  		var args = Array.prototype.slice.call(arguments, 1);
  
  		this.triggerWith(name, this, args);
  
  		return this; // for chaining
  	},
  
  
  	triggerWith: function(name, context, args) {
  		var callbacks = this.getCallbacks(name);
  
  		callbacks.fireWith(context, args);
  
  		return this; // for chaining
  	},
  
  
  	getCallbacks: function(name) {
  		var callbacks;
  
  		if (!this.callbackHash) {
  			this.callbackHash = {};
  		}
  
  		callbacks = this.callbackHash[name];
  		if (!callbacks) {
  			callbacks = this.callbackHash[name] = $.Callbacks();
  		}
  
  		return callbacks;
  	}
  
  });
  ;;
  
  /* 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({
  
  	isHidden: true,
  	options: null,
  	el: null, // the container element for the popover. generated by this object
  	documentMousedownProxy: null, // document mousedown handler bound to `this`
  	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) {
  			$(document).on('mousedown', this.documentMousedownProxy = proxy(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;
  		}
  
  		$(document).off('mousedown', this.documentMousedownProxy);
  	},
  
  
  	// 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 "coordinate map" converts pixel coordinates into an associated cell, which has an associated date
  ------------------------------------------------------------------------------------------------------------------------
  Common interface:
  
  	CoordMap.prototype = {
  		build: function() {},
  		getCell: function(x, y) {}
  	};
  
  */
  
  /* Coordinate map for a grid component
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var GridCoordMap = Class.extend({
  
  	grid: null, // reference to the Grid
  	rowCoords: null, // array of {top,bottom} objects
  	colCoords: null, // array of {left,right} objects
  
  	containerEl: null, // container element that all coordinates are constrained to. optionally assigned
  	bounds: null,
  
  
  	constructor: function(grid) {
  		this.grid = grid;
  	},
  
  
  	// Queries the grid for the coordinates of all the cells
  	build: function() {
  		this.grid.build();
  		this.rowCoords = this.grid.computeRowCoords();
  		this.colCoords = this.grid.computeColCoords();
  		this.computeBounds();
  	},
  
  
  	// Clears the coordinates data to free up memory
  	clear: function() {
  		this.grid.clear();
  		this.rowCoords = null;
  		this.colCoords = null;
  	},
  
  
  	// Given a coordinate of the document, gets the associated cell. If no cell is underneath, returns null
  	getCell: function(x, y) {
  		var rowCoords = this.rowCoords;
  		var rowCnt = rowCoords.length;
  		var colCoords = this.colCoords;
  		var colCnt = colCoords.length;
  		var hitRow = null;
  		var hitCol = null;
  		var i, coords;
  		var cell;
  
  		if (this.inBounds(x, y)) {
  
  			for (i = 0; i < rowCnt; i++) {
  				coords = rowCoords[i];
  				if (y >= coords.top && y < coords.bottom) {
  					hitRow = i;
  					break;
  				}
  			}
  
  			for (i = 0; i < colCnt; i++) {
  				coords = colCoords[i];
  				if (x >= coords.left && x < coords.right) {
  					hitCol = i;
  					break;
  				}
  			}
  
  			if (hitRow !== null && hitCol !== null) {
  
  				cell = this.grid.getCell(hitRow, hitCol); // expected to return a fresh object we can modify
  				cell.grid = this.grid; // for CellDragListener's isCellsEqual. dragging between grids
  
  				// make the coordinates available on the cell object
  				$.extend(cell, rowCoords[hitRow], colCoords[hitCol]);
  
  				return cell;
  			}
  		}
  
  		return null;
  	},
  
  
  	// If there is a containerEl, compute the bounds into min/max values
  	computeBounds: function() {
  		this.bounds = this.containerEl ?
  			getClientRect(this.containerEl) : // area within scrollbars
  			null;
  	},
  
  
  	// Determines if the given coordinates are in bounds. If no `containerEl`, always true
  	inBounds: function(x, y) {
  		var bounds = this.bounds;
  
  		if (bounds) {
  			return x >= bounds.left && x < bounds.right && y >= bounds.top && y < bounds.bottom;
  		}
  
  		return true;
  	}
  
  });
  
  
  /* Coordinate map that is a combination of multiple other coordinate maps
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var ComboCoordMap = Class.extend({
  
  	coordMaps: null, // an array of CoordMaps
  
  
  	constructor: function(coordMaps) {
  		this.coordMaps = coordMaps;
  	},
  
  
  	// Builds all coordMaps
  	build: function() {
  		var coordMaps = this.coordMaps;
  		var i;
  
  		for (i = 0; i < coordMaps.length; i++) {
  			coordMaps[i].build();
  		}
  	},
  
  
  	// Queries all coordMaps for the cell underneath the given coordinates, returning the first result
  	getCell: function(x, y) {
  		var coordMaps = this.coordMaps;
  		var cell = null;
  		var i;
  
  		for (i = 0; i < coordMaps.length && !cell; i++) {
  			cell = coordMaps[i].getCell(x, y);
  		}
  
  		return cell;
  	},
  
  
  	// Clears all coordMaps
  	clear: function() {
  		var coordMaps = this.coordMaps;
  		var i;
  
  		for (i = 0; i < coordMaps.length; i++) {
  			coordMaps[i].clear();
  		}
  	}
  
  });
  
  ;;
  
  /* Tracks a drag's mouse movement, firing various handlers
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var DragListener = fc.DragListener = Class.extend({
  
  	options: null,
  
  	isListening: false,
  	isDragging: false,
  
  	// coordinates of the initial mousedown
  	originX: null,
  	originY: null,
  
  	// handler attached to the document, bound to the DragListener's `this`
  	mousemoveProxy: null,
  	mouseupProxy: null,
  
  	// for IE8 bug-fighting behavior, for now
  	subjectEl: null, // the element being draged. optional
  	subjectHref: null,
  
  	scrollEl: null,
  	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
  	scrollHandlerProxy: null, // this-scoped function for handling when scrollEl is scrolled
  
  	scrollSensitivity: 30, // pixels from edge for scrolling to start
  	scrollSpeed: 200, // pixels per second, at maximum speed
  	scrollIntervalMs: 50, // millisecond wait between scroll increment
  
  
  	constructor: function(options) {
  		options = options || {};
  		this.options = options;
  		this.subjectEl = options.subjectEl;
  	},
  
  
  	// Call this when the user does a mousedown. Will probably lead to startListening
  	mousedown: function(ev) {
  		if (isPrimaryMouseButton(ev)) {
  
  			ev.preventDefault(); // prevents native selection in most browsers
  
  			this.startListening(ev);
  
  			// start the drag immediately if there is no minimum distance for a drag start
  			if (!this.options.distance) {
  				this.startDrag(ev);
  			}
  		}
  	},
  
  
  	// Call this to start tracking mouse movements
  	startListening: function(ev) {
  		var scrollParent;
  
  		if (!this.isListening) {
  
  			// grab scroll container and attach handler
  			if (ev && this.options.scroll) {
  				scrollParent = getScrollParent($(ev.target));
  				if (!scrollParent.is(window) && !scrollParent.is(document)) {
  					this.scrollEl = scrollParent;
  
  					// scope to `this`, and use `debounce` to make sure rapid calls don't happen
  					this.scrollHandlerProxy = debounce(proxy(this, 'scrollHandler'), 100);
  					this.scrollEl.on('scroll', this.scrollHandlerProxy);
  				}
  			}
  
  			$(document)
  				.on('mousemove', this.mousemoveProxy = proxy(this, 'mousemove'))
  				.on('mouseup', this.mouseupProxy = proxy(this, 'mouseup'))
  				.on('selectstart', this.preventDefault); // prevents native selection in IE<=8
  
  			if (ev) {
  				this.originX = ev.pageX;
  				this.originY = ev.pageY;
  			}
  			else {
  				// if no starting information was given, origin will be the topleft corner of the screen.
  				// if so, dx/dy in the future will be the absolute coordinates.
  				this.originX = 0;
  				this.originY = 0;
  			}
  
  			this.isListening = true;
  			this.listenStart(ev);
  		}
  	},
  
  
  	// Called when drag listening has started (but a real drag has not necessarily began)
  	listenStart: function(ev) {
  		this.trigger('listenStart', ev);
  	},
  
  
  	// Called when the user moves the mouse
  	mousemove: function(ev) {
  		var dx = ev.pageX - this.originX;
  		var dy = ev.pageY - this.originY;
  		var minDistance;
  		var distanceSq; // current distance from the origin, squared
  
  		if (!this.isDragging) { // if not already dragging...
  			// then start the drag if the minimum distance criteria is met
  			minDistance = this.options.distance || 1;
  			distanceSq = dx * dx + dy * dy;
  			if (distanceSq >= minDistance * minDistance) { // use pythagorean theorem
  				this.startDrag(ev);
  			}
  		}
  
  		if (this.isDragging) {
  			this.drag(dx, dy, ev); // report a drag, even if this mousemove initiated the drag
  		}
  	},
  
  
  	// Call this to initiate a legitimate drag.
  	// This function is called internally from this class, but can also be called explicitly from outside
  	startDrag: function(ev) {
  
  		if (!this.isListening) { // startDrag must have manually initiated
  			this.startListening();
  		}
  
  		if (!this.isDragging) {
  			this.isDragging = true;
  			this.dragStart(ev);
  		}
  	},
  
  
  	// Called when the actual drag has started (went beyond minDistance)
  	dragStart: function(ev) {
  		var subjectEl = this.subjectEl;
  
  		this.trigger('dragStart', ev);
  
  		// remove a mousedown'd <a>'s href so it is not visited (IE8 bug)
  		if ((this.subjectHref = subjectEl ? subjectEl.attr('href') : null)) {
  			subjectEl.removeAttr('href');
  		}
  	},
  
  
  	// Called while the mouse is being moved and when we know a legitimate drag is taking place
  	drag: function(dx, dy, ev) {
  		this.trigger('drag', dx, dy, ev);
  		this.updateScroll(ev); // will possibly cause scrolling
  	},
  
  
  	// Called when the user does a mouseup
  	mouseup: function(ev) {
  		this.stopListening(ev);
  	},
  
  
  	// Called when the drag is over. Will not cause listening to stop however.
  	// A concluding 'cellOut' event will NOT be triggered.
  	stopDrag: function(ev) {
  		if (this.isDragging) {
  			this.stopScrolling();
  			this.dragStop(ev);
  			this.isDragging = false;
  		}
  	},
  
  
  	// Called when dragging has been stopped
  	dragStop: function(ev) {
  		var _this = this;
  
  		this.trigger('dragStop', ev);
  
  		// restore a mousedown'd <a>'s href (for IE8 bug)
  		setTimeout(function() { // must be outside of the click's execution
  			if (_this.subjectHref) {
  				_this.subjectEl.attr('href', _this.subjectHref);
  			}
  		}, 0);
  	},
  
  
  	// Call this to stop listening to the user's mouse events
  	stopListening: function(ev) {
  		this.stopDrag(ev); // if there's a current drag, kill it
  
  		if (this.isListening) {
  
  			// remove the scroll handler if there is a scrollEl
  			if (this.scrollEl) {
  				this.scrollEl.off('scroll', this.scrollHandlerProxy);
  				this.scrollHandlerProxy = null;
  			}
  
  			$(document)
  				.off('mousemove', this.mousemoveProxy)
  				.off('mouseup', this.mouseupProxy)
  				.off('selectstart', this.preventDefault);
  
  			this.mousemoveProxy = null;
  			this.mouseupProxy = null;
  
  			this.isListening = false;
  			this.listenStop(ev);
  		}
  	},
  
  
  	// Called when drag listening has stopped
  	listenStop: function(ev) {
  		this.trigger('listenStop', ev);
  	},
  
  
  	// 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));
  		}
  	},
  
  
  	// Stops a given mouse event from doing it's native browser action. In our case, text selection.
  	preventDefault: function(ev) {
  		ev.preventDefault();
  	},
  
  
  	/* Scrolling
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Computes and stores the bounding rectangle of scrollEl
  	computeScrollBounds: function() {
  		var el = this.scrollEl;
  
  		this.scrollBounds = el ? getOuterRect(el) : null;
  			// 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
  	updateScroll: 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 - (ev.pageY - bounds.top)) / sensitivity;
  			bottomCloseness = (sensitivity - (bounds.bottom - ev.pageY)) / sensitivity;
  			leftCloseness = (sensitivity - (ev.pageX - bounds.left)) / sensitivity;
  			rightCloseness = (sensitivity - (bounds.right - ev.pageX)) / 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.stopScrolling();
  		}
  	},
  
  
  	// Kills any existing scrolling animation loop
  	stopScrolling: function() {
  		if (this.scrollIntervalId) {
  			clearInterval(this.scrollIntervalId);
  			this.scrollIntervalId = null;
  
  			// when all done with scrolling, recompute positions since they probably changed
  			this.scrollStop();
  		}
  	},
  
  
  	// Get called when the scrollEl is scrolled (NOTE: this is delayed via debounce)
  	scrollHandler: function() {
  		// recompute all coordinates, but *only* if this is *not* part of our scrolling animation
  		if (!this.scrollIntervalId) {
  			this.scrollStop();
  		}
  	},
  
  
  	// Called when scrolling has stopped, whether through auto scroll, or the user scrolling
  	scrollStop: function() {
  	}
  
  });
  
  ;;
  
  /* Tracks mouse movements over a CoordMap and raises events about which cell the mouse is over.
  ------------------------------------------------------------------------------------------------------------------------
  options:
  - subjectEl
  - subjectCenter
  */
  
  var CellDragListener = DragListener.extend({
  
  	coordMap: null, // converts coordinates to date cells
  	origCell: null, // the cell the mouse was over when listening started
  	cell: null, // the cell the mouse is over
  	coordAdjust: null, // delta that will be added to the mouse coordinates when computing collisions
  
  
  	constructor: function(coordMap, options) {
  		DragListener.prototype.constructor.call(this, options); // call the super-constructor
  
  		this.coordMap = coordMap;
  	},
  
  
  	// Called when drag listening starts (but a real drag has not necessarily began).
  	// ev might be undefined if dragging was started manually.
  	listenStart: function(ev) {
  		var subjectEl = this.subjectEl;
  		var subjectRect;
  		var origPoint;
  		var point;
  
  		DragListener.prototype.listenStart.apply(this, arguments); // call the super-method
  
  		this.computeCoords();
  
  		if (ev) {
  			origPoint = { left: ev.pageX, top: ev.pageY };
  			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.origCell = this.getCell(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 cell. best for large subjects
  				if (this.origCell) {
  					subjectRect = intersectRects(this.origCell, subjectRect) ||
  						subjectRect; // in case there is no intersection
  				}
  
  				point = getRectCenter(subjectRect);
  			}
  
  			this.coordAdjust = diffPoints(point, origPoint); // point - origPoint
  		}
  		else {
  			this.origCell = null;
  			this.coordAdjust = null;
  		}
  	},
  
  
  	// Recomputes the drag-critical positions of elements
  	computeCoords: function() {
  		this.coordMap.build();
  		this.computeScrollBounds();
  	},
  
  
  	// Called when the actual drag has started
  	dragStart: function(ev) {
  		var cell;
  
  		DragListener.prototype.dragStart.apply(this, arguments); // call the super-method
  
  		cell = this.getCell(ev.pageX, ev.pageY); // might be different from this.origCell if the min-distance is large
  
  		// report the initial cell the mouse is over
  		// especially important if no min-distance and drag starts immediately
  		if (cell) {
  			this.cellOver(cell);
  		}
  	},
  
  
  	// Called when the drag moves
  	drag: function(dx, dy, ev) {
  		var cell;
  
  		DragListener.prototype.drag.apply(this, arguments); // call the super-method
  
  		cell = this.getCell(ev.pageX, ev.pageY);
  
  		if (!isCellsEqual(cell, this.cell)) { // a different cell than before?
  			if (this.cell) {
  				this.cellOut();
  			}
  			if (cell) {
  				this.cellOver(cell);
  			}
  		}
  	},
  
  
  	// Called when dragging has been stopped
  	dragStop: function() {
  		this.cellDone();
  		DragListener.prototype.dragStop.apply(this, arguments); // call the super-method
  	},
  
  
  	// Called when a the mouse has just moved over a new cell
  	cellOver: function(cell) {
  		this.cell = cell;
  		this.trigger('cellOver', cell, isCellsEqual(cell, this.origCell), this.origCell);
  	},
  
  
  	// Called when the mouse has just moved out of a cell
  	cellOut: function() {
  		if (this.cell) {
  			this.trigger('cellOut', this.cell);
  			this.cellDone();
  			this.cell = null;
  		}
  	},
  
  
  	// Called after a cellOut. Also called before a dragStop
  	cellDone: function() {
  		if (this.cell) {
  			this.trigger('cellDone', this.cell);
  		}
  	},
  
  
  	// Called when drag listening has stopped
  	listenStop: function() {
  		DragListener.prototype.listenStop.apply(this, arguments); // call the super-method
  
  		this.origCell = this.cell = null;
  		this.coordMap.clear();
  	},
  
  
  	// Called when scrolling has stopped, whether through auto scroll, or the user scrolling
  	scrollStop: function() {
  		DragListener.prototype.scrollStop.apply(this, arguments); // call the super-method
  
  		this.computeCoords(); // cells' absolute positions will be in new places. recompute
  	},
  
  
  	// Gets the cell underneath the coordinates for the given mouse event
  	getCell: function(left, top) {
  
  		if (this.coordAdjust) {
  			left += this.coordAdjust.left;
  			top += this.coordAdjust.top;
  		}
  
  		return this.coordMap.getCell(left, top);
  	}
  
  });
  
  
  // Returns `true` if the cells are identically equal. `false` otherwise.
  // They must have the same row, col, and be from the same grid.
  // Two null values will be considered equal, as two "out of the grid" states are the same.
  function isCellsEqual(cell1, cell2) {
  
  	if (!cell1 && !cell2) {
  		return true;
  	}
  
  	if (cell1 && cell2) {
  		return cell1.grid === cell2.grid &&
  			cell1.row === cell2.row &&
  			cell1.col === cell2.col;
  	}
  
  	return false;
  }
  
  ;;
  
  /* Creates a clone of an element and lets it track the mouse as it moves
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var MouseFollower = Class.extend({
  
  	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 initial position of the mouse
  	mouseY0: null,
  	mouseX0: null,
  
  	// the number of pixels the mouse has moved from its initial position
  	topDelta: null,
  	leftDelta: null,
  
  	mousemoveProxy: null, // document mousemove handler, bound to the MouseFollower's `this`
  
  	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.mouseY0 = ev.pageY;
  			this.mouseX0 = ev.pageX;
  			this.topDelta = 0;
  			this.leftDelta = 0;
  
  			if (!this.isHidden) {
  				this.updatePosition();
  			}
  
  			$(document).on('mousemove', this.mousemoveProxy = proxy(this, 'mousemove'));
  		}
  	},
  
  
  	// 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() {
  			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;
  
  			$(document).off('mousemove', this.mousemoveProxy);
  
  			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) {
  			this.sourceEl.width(); // hack to force IE8 to compute correct bounding box
  			el = this.el = this.sourceEl.clone()
  				.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
  				})
  				.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) {
  			this.sourceEl.width(); // hack to force IE8 to compute correct bounding box
  			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
  	mousemove: function(ev) {
  		this.topDelta = ev.pageY - this.mouseY0;
  		this.leftDelta = ev.pageX - this.mouseX0;
  
  		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();
  		}
  	}
  
  });
  
  ;;
  
  /* A utility class for rendering <tr> rows.
  ----------------------------------------------------------------------------------------------------------------------*/
  // It leverages methods of the subclass and the View to determine custom rendering behavior for each row "type"
  // (such as highlight rows, day rows, helper rows, etc).
  
  var RowRenderer = Class.extend({
  
  	view: null, // a View object
  	isRTL: null, // shortcut to the view's isRTL option
  	cellHtml: '<td/>', // plain default HTML used for a cell when no other is available
  
  
  	constructor: function(view) {
  		this.view = view;
  		this.isRTL = view.opt('isRTL');
  	},
  
  
  	// Renders the HTML for a row, leveraging custom cell-HTML-renderers based on the `rowType`.
  	// Also applies the "intro" and "outro" cells, which are specified by the subclass and views.
  	// `row` is an optional row number.
  	rowHtml: function(rowType, row) {
  		var renderCell = this.getHtmlRenderer('cell', rowType);
  		var rowCellHtml = '';
  		var col;
  		var cell;
  
  		row = row || 0;
  
  		for (col = 0; col < this.colCnt; col++) {
  			cell = this.getCell(row, col);
  			rowCellHtml += renderCell(cell);
  		}
  
  		rowCellHtml = this.bookendCells(rowCellHtml, rowType, row); // apply intro and outro
  
  		return '<tr>' + rowCellHtml + '</tr>';
  	},
  
  
  	// Applies the "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.
  	// `cells` can be an HTML string of <td>'s or a jQuery <tr> element
  	// `row` is an optional row number.
  	bookendCells: function(cells, rowType, row) {
  		var intro = this.getHtmlRenderer('intro', rowType)(row || 0);
  		var outro = this.getHtmlRenderer('outro', rowType)(row || 0);
  		var prependHtml = this.isRTL ? outro : intro;
  		var appendHtml = this.isRTL ? intro : outro;
  
  		if (typeof cells === 'string') {
  			return prependHtml + cells + appendHtml;
  		}
  		else { // a jQuery <tr> element
  			return cells.prepend(prependHtml).append(appendHtml);
  		}
  	},
  
  
  	// Returns an HTML-rendering function given a specific `rendererName` (like cell, intro, or outro) and a specific
  	// `rowType` (like day, eventSkeleton, helperSkeleton), which is optional.
  	// If a renderer for the specific rowType doesn't exist, it will fall back to a generic renderer.
  	// We will query the View object first for any custom rendering functions, then the methods of the subclass.
  	getHtmlRenderer: function(rendererName, rowType) {
  		var view = this.view;
  		var generalName; // like "cellHtml"
  		var specificName; // like "dayCellHtml". based on rowType
  		var provider; // either the View or the RowRenderer subclass, whichever provided the method
  		var renderer;
  
  		generalName = rendererName + 'Html';
  		if (rowType) {
  			specificName = rowType + capitaliseFirstLetter(rendererName) + 'Html';
  		}
  
  		if (specificName && (renderer = view[specificName])) {
  			provider = view;
  		}
  		else if (specificName && (renderer = this[specificName])) {
  			provider = this;
  		}
  		else if ((renderer = view[generalName])) {
  			provider = view;
  		}
  		else if ((renderer = this[generalName])) {
  			provider = this;
  		}
  
  		if (typeof renderer === 'function') {
  			return function() {
  				return renderer.apply(provider, arguments) || ''; // use correct `this` and always return a string
  			};
  		}
  
  		// the rendered can be a plain string as well. if not specified, always an empty string.
  		return function() {
  			return renderer || '';
  		};
  	}
  
  });
  
  ;;
  
  /* An abstract class comprised of a "grid" of cells that each represent a specific datetime
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var Grid = fc.Grid = RowRenderer.extend({
  
  	start: null, // the date of the first cell
  	end: null, // the date after the last cell
  
  	rowCnt: 0, // number of rows
  	colCnt: 0, // number of cols
  
  	el: null, // the containing element
  	coordMap: null, // a GridCoordMap that converts pixel values to datetimes
  	elsByFill: null, // a hash of jQuery element sets used for rendering each fill. Keyed by fill name.
  
  	externalDragStartProxy: null, // binds the Grid's scope to externalDragStart (in DayGrid.events)
  
  	// derived from options
  	colHeadFormat: null, // TODO: move to another class. not applicable to all Grids
  	eventTimeFormat: null,
  	displayEventTime: null,
  	displayEventEnd: null,
  
  	// if all cells are the same length of time, the duration they all share. optional.
  	// when defined, allows the computeCellRange shortcut, as well as improved resizing behavior.
  	cellDuration: null,
  
  	// if defined, holds the unit identified (ex: "year" or "month") that determines the level of granularity
  	// of the date cells. if not defined, assumes to be day and time granularity.
  	largeUnit: null,
  
  
  	constructor: function() {
  		RowRenderer.apply(this, arguments); // call the super-constructor
  
  		this.coordMap = new GridCoordMap(this);
  		this.elsByFill = {};
  		this.externalDragStartProxy = proxy(this, 'externalDragStart');
  	},
  
  
  	/* Options
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Generates the format string used for the text in column headers, if not explicitly defined by 'columnFormat'
  	// TODO: move to another class. not applicable to all Grids
  	computeColHeadFormat: function() {
  		// subclasses must implement if they want to use headHtml()
  	},
  
  
  	// 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 cell system 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;
  
  		// Populate option-derived settings. Look for override first, then compute if necessary.
  		this.colHeadFormat = view.opt('columnFormat') || this.computeColHeadFormat();
  
  		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;
  	},
  
  
  	// Called before the grid's coordinates will need to be queried for cells.
  	// Any non-date-related cell system internal data should be built.
  	build: function() {
  	},
  
  
  	// Called after the grid's coordinates are done being relied upon.
  	// Any non-date-related cell system internal data should be cleared.
  	clear: function() {
  	},
  
  
  	// Converts a range with an inclusive `start` and an exclusive `end` into an array of segment objects
  	rangeToSegs: function(range) {
  		// subclasses must implement
  	},
  
  
  	// Diffs the two dates, returning a duration, based on granularity of the grid
  	diffDates: function(a, b) {
  		if (this.largeUnit) {
  			return diffByUnit(a, b, this.largeUnit);
  		}
  		else {
  			return diffDayTime(a, b);
  		}
  	},
  
  
  	/* Cells
  	------------------------------------------------------------------------------------------------------------------*/
  	// NOTE: columns are ordered left-to-right
  
  
  	// Gets an object containing row/col number, misc data, and range information about the cell.
  	// Accepts row/col values, an object with row/col properties, or a single-number offset from the first cell.
  	getCell: function(row, col) {
  		var cell;
  
  		if (col == null) {
  			if (typeof row === 'number') { // a single-number offset
  				col = row % this.colCnt;
  				row = Math.floor(row / this.colCnt);
  			}
  			else { // an object with row/col properties
  				col = row.col;
  				row = row.row;
  			}
  		}
  
  		cell = { row: row, col: col };
  
  		$.extend(cell, this.getRowData(row), this.getColData(col));
  		$.extend(cell, this.computeCellRange(cell));
  
  		return cell;
  	},
  
  
  	// Given a cell object with index and misc data, generates a range object
  	// If the grid is leveraging cellDuration, this doesn't need to be defined. Only computeCellDate does.
  	// If being overridden, should return a range with reference-free date copies.
  	computeCellRange: function(cell) {
  		var date = this.computeCellDate(cell);
  
  		return {
  			start: date,
  			end: date.clone().add(this.cellDuration)
  		};
  	},
  
  
  	// Given a cell, returns its start date. Should return a reference-free date copy.
  	computeCellDate: function(cell) {
  		// subclasses can implement
  	},
  
  
  	// Retrieves misc data about the given row
  	getRowData: function(row) {
  		return {};
  	},
  
  
  	// Retrieves misc data baout the given column
  	getColData: function(col) {
  		return {};
  	},
  
  
  	// Retrieves the element representing the given row
  	getRowEl: function(row) {
  		// subclasses should implement if leveraging the default getCellDayEl() or computeRowCoords()
  	},
  
  
  	// Retrieves the element representing the given column
  	getColEl: function(col) {
  		// subclasses should implement if leveraging the default getCellDayEl() or computeColCoords()
  	},
  
  
  	// Given a cell object, returns the element that represents the cell's whole-day
  	getCellDayEl: function(cell) {
  		return this.getColEl(cell.col) || this.getRowEl(cell.row);
  	},
  
  
  	/* Cell Coordinates
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Computes the top/bottom coordinates of all rows.
  	// By default, queries the dimensions of the element provided by getRowEl().
  	computeRowCoords: function() {
  		var items = [];
  		var i, el;
  		var top;
  
  		for (i = 0; i < this.rowCnt; i++) {
  			el = this.getRowEl(i);
  			top = el.offset().top;
  			items.push({
  				top: top,
  				bottom: top + el.outerHeight()
  			});
  		}
  
  		return items;
  	},
  
  
  	// Computes the left/right coordinates of all rows.
  	// By default, queries the dimensions of the element provided by getColEl(). Columns can be LTR or RTL.
  	computeColCoords: function() {
  		var items = [];
  		var i, el;
  		var left;
  
  		for (i = 0; i < this.colCnt; i++) {
  			el = this.getColEl(i);
  			left = el.offset().left;
  			items.push({
  				left: left,
  				right: left + el.outerWidth()
  			});
  		}
  
  		return items;
  	},
  
  
  	/* Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Sets the container element that the grid should render inside of.
  	// Does other DOM-related initializations.
  	setElement: function(el) {
  		var _this = this;
  
  		this.el = el;
  
  		// attach a handler to the grid's root element.
  		// jQuery will take care of unregistering them when removeElement gets called.
  		el.on('mousedown', function(ev) {
  			if (
  				!$(ev.target).is('.fc-event-container *, .fc-more') && // not an an event element, or "more.." link
  				!$(ev.target).closest('.fc-popover').length // not on a popover (like the "more.." events one)
  			) {
  				_this.dayMousedown(ev);
  			}
  		});
  
  		// attach event-element-related handlers. in Grid.events
  		// same garbage collection note as above.
  		this.bindSegHandlers();
  
  		this.bindGlobalHandlers();
  	},
  
  
  	// 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.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 cells 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() {
  		$(document).on('dragstart sortstart', this.externalDragStartProxy); // jqui
  	},
  
  
  	// Unbinds DOM handlers from elements that reside outside the grid
  	unbindGlobalHandlers: function() {
  		$(document).off('dragstart sortstart', this.externalDragStartProxy); // jqui
  	},
  
  
  	// Process a mousedown on an element that represents a day. For day clicking and selecting.
  	dayMousedown: function(ev) {
  		var _this = this;
  		var view = this.view;
  		var isSelectable = view.opt('selectable');
  		var dayClickCell; // null if invalid dayClick
  		var selectionRange; // null if invalid selection
  
  		// this listener tracks a mousedown on a day element, and a subsequent drag.
  		// if the drag ends on the same day, it is a 'dayClick'.
  		// if 'selectable' is enabled, this listener also detects selections.
  		var dragListener = new CellDragListener(this.coordMap, {
  			//distance: 5, // needs more work if we want dayClick to fire correctly
  			scroll: view.opt('dragScroll'),
  			dragStart: function() {
  				view.unselect(); // since we could be rendering a new selection, we want to clear any old one
  			},
  			cellOver: function(cell, isOrig, origCell) {
  				if (origCell) { // click needs to have started on a cell
  					dayClickCell = isOrig ? cell : null; // single-cell selection is a day click
  					if (isSelectable) {
  						selectionRange = _this.computeSelection(origCell, cell);
  						if (selectionRange) {
  							_this.renderSelection(selectionRange);
  						}
  						else {
  							disableCursor();
  						}
  					}
  				}
  			},
  			cellOut: function(cell) {
  				dayClickCell = null;
  				selectionRange = null;
  				_this.unrenderSelection();
  				enableCursor();
  			},
  			listenStop: function(ev) {
  				if (dayClickCell) {
  					view.triggerDayClick(dayClickCell, _this.getCellDayEl(dayClickCell), ev);
  				}
  				if (selectionRange) {
  					// the selection will already have been rendered. just report it
  					view.reportSelection(selectionRange, ev);
  				}
  				enableCursor();
  			}
  		});
  
  		dragListener.mousedown(ev); // start listening, which will eventually initiate a dragStart
  	},
  
  
  	/* Event Helper
  	------------------------------------------------------------------------------------------------------------------*/
  	// TODO: should probably move this to Grid.events, like we did event dragging / resizing
  
  
  	// Renders a mock event over the given range
  	renderRangeHelper: function(range, sourceSeg) {
  		var fakeEvent = this.fabricateHelperEvent(range, sourceSeg);
  
  		this.renderHelper(fakeEvent, sourceSeg); // do the actual rendering
  	},
  
  
  	// Builds a fake event given a date range it should cover, 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(range, sourceSeg) {
  		var fakeEvent = sourceSeg ? createObject(sourceSeg.event) : {}; // mask the original event object if possible
  
  		fakeEvent.start = range.start.clone();
  		fakeEvent.end = range.end ? range.end.clone() : null;
  		fakeEvent.allDay = null; // force it to be freshly computed by normalizeEventRange
  		this.view.calendar.normalizeEventRange(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
  	renderHelper: function(event, 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.
  	renderSelection: function(range) {
  		this.renderHighlight(this.selectionRangeToSegs(range));
  	},
  
  
  	// Unrenders any visual indications of a selection. Will unrender a highlight by default.
  	unrenderSelection: function() {
  		this.unrenderHighlight();
  	},
  
  
  	// Given the first and last cells of a selection, returns a range object.
  	// Will return something falsy if the selection is invalid (when outside of selectionConstraint for example).
  	// Subclasses can override and provide additional data in the range object. Will be passed to renderSelection().
  	computeSelection: function(firstCell, lastCell) {
  		var dates = [
  			firstCell.start,
  			firstCell.end,
  			lastCell.start,
  			lastCell.end
  		];
  		var range;
  
  		dates.sort(compareNumbers); // sorts chronologically. works with Moments
  
  		range = {
  			start: dates[0].clone(),
  			end: dates[3].clone()
  		};
  
  		if (!this.view.calendar.isSelectionRangeAllowed(range)) {
  			return null;
  		}
  
  		return range;
  	},
  
  
  	selectionRangeToSegs: function(range) {
  		return this.rangeToSegs(range);
  	},
  
  
  	/* Highlight
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders an emphasis on the given date range. Given an array of segments.
  	renderHighlight: function(segs) {
  		this.renderFill('highlight', segs);
  	},
  
  
  	// 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' ];
  	},
  
  
  	/* Fill System (highlight, background events, business hours)
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// 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 enought o 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
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders a day-of-week header row.
  	// TODO: move to another class. not applicable to all Grids
  	headHtml: function() {
  		return '' +
  			'<div class="fc-row ' + this.view.widgetHeaderClass + '">' +
  				'<table>' +
  					'<thead>' +
  						this.rowHtml('head') + // leverages RowRenderer
  					'</thead>' +
  				'</table>' +
  			'</div>';
  	},
  
  
  	// Used by the `headHtml` method, via RowRenderer, for rendering the HTML of a day-of-week header cell
  	// TODO: move to another class. not applicable to all Grids
  	headCellHtml: function(cell) {
  		var view = this.view;
  		var date = cell.start;
  
  		return '' +
  			'<th class="fc-day-header ' + view.widgetHeaderClass + ' fc-' + dayIDs[date.day()] + '">' +
  				htmlEscape(date.format(this.colHeadFormat)) +
  			'</th>';
  	},
  
  
  	// Renders the HTML for a single-day background cell
  	bgCellHtml: function(cell) {
  		var view = this.view;
  		var date = cell.start;
  		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
  			'></td>';
  	},
  
  
  	// Computes HTML classNames for a single-day cell
  	getDayClasses: function(date) {
  		var view = this.view;
  		var today = view.calendar.getNow().stripTime();
  		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',
  				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({
  
  	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
  
  
  	// Renders the given events onto the grid
  	renderEvents: function(events) {
  		var segs = this.eventsToSegs(events);
  		var bgSegs = [];
  		var fgSegs = [];
  		var i, seg;
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  
  			if (isBgEvent(seg.event)) {
  				bgSegs.push(seg);
  			}
  			else {
  				fgSegs.push(seg);
  			}
  		}
  
  		// Render each different type of segment.
  		// Each function may return a subset of the segs, segs that were actually rendered.
  		bgSegs = this.renderBgSegs(bgSegs) || bgSegs;
  		fgSegs = this.renderFgSegs(fgSegs) || fgSegs;
  
  		this.segs = bgSegs.concat(fgSegs);
  	},
  
  
  	// Unrenders all events currently rendered on the grid
  	unrenderEvents: function() {
  		this.triggerSegMouseout(); // trigger an eventMouseout if user's mouse is over an event
  
  		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 the fill system.
  	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 the fill system.
  	// TODO: consolidate with getEventSkinCss?
  	bgEventSegCss: function(seg) {
  		var view = this.view;
  		var event = seg.event;
  		var source = event.source || {};
  
  		return {
  			'background-color':
  				event.backgroundColor ||
  				event.color ||
  				source.backgroundColor ||
  				source.color ||
  				view.opt('eventBackgroundColor') ||
  				view.opt('eventColor')
  		};
  	},
  
  
  	// Generates an array of classNames to be used for the rendering business hours overlay. Called by the fill system.
  	businessHoursSegClasses: function(seg) {
  		return [ 'fc-nonbusiness', 'fc-bgevent' ];
  	},
  
  
  	/* Handlers
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Attaches event-element-related handlers to the container element and leverage bubbling
  	bindSegHandlers: function() {
  		var _this = this;
  		var view = this.view;
  
  		$.each(
  			{
  				mouseenter: function(seg, ev) {
  					_this.triggerSegMouseover(seg, ev);
  				},
  				mouseleave: function(seg, ev) {
  					_this.triggerSegMouseout(seg, ev);
  				},
  				click: function(seg, ev) {
  					return view.trigger('eventClick', this, seg.event, ev); // can return `false` to cancel
  				},
  				mousedown: function(seg, ev) {
  					if ($(ev.target).is('.fc-resizer') && view.isEventResizable(seg.event)) {
  						_this.segResizeMousedown(seg, ev, $(ev.target).is('.fc-start-resizer'));
  					}
  					else if (view.isEventDraggable(seg.event)) {
  						_this.segDragMousedown(seg, ev);
  					}
  				}
  			},
  			function(name, func) {
  				// attach the handler to the container element and only listen for real event elements via bubbling
  				_this.el.on(name, '.fc-event-container > *', 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 func.call(this, seg, ev); // `this` will be the event element
  					}
  				});
  			}
  		);
  	},
  
  
  	// Updates internal state and triggers handlers for when an event element is moused over
  	triggerSegMouseover: function(seg, ev) {
  		if (!this.mousedOverSeg) {
  			this.mousedOverSeg = seg;
  			this.view.trigger('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.
  	triggerSegMouseout: 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;
  			this.view.trigger('eventMouseout', seg.el[0], seg.event, ev);
  		}
  	},
  
  
  	/* Event Dragging
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Called when the user does a mousedown on an event, which might lead to dragging.
  	// Generic enough to work with any type of Grid.
  	segDragMousedown: function(seg, ev) {
  		var _this = this;
  		var view = this.view;
  		var calendar = view.calendar;
  		var el = seg.el;
  		var event = seg.event;
  		var dropLocation;
  
  		// A clone of the original element that will move with the mouse
  		var mouseFollower = new MouseFollower(seg.el, {
  			parentEl: view.el,
  			opacity: view.opt('dragOpacity'),
  			revertDuration: view.opt('dragRevertDuration'),
  			zIndex: 2 // one above the .fc-view
  		});
  
  		// Tracks mouse movement over the *view's* coordinate map. Allows dragging and dropping between subcomponents
  		// of the view.
  		var dragListener = new CellDragListener(view.coordMap, {
  			distance: 5,
  			scroll: view.opt('dragScroll'),
  			subjectEl: el,
  			subjectCenter: true,
  			listenStart: function(ev) {
  				mouseFollower.hide(); // don't show until we know this is a real drag
  				mouseFollower.start(ev);
  			},
  			dragStart: function(ev) {
  				_this.triggerSegMouseout(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
  			},
  			cellOver: function(cell, isOrig, origCell) {
  
  				// starting cell could be forced (DayGrid.limit)
  				if (seg.cell) {
  					origCell = seg.cell;
  				}
  
  				dropLocation = _this.computeEventDrop(origCell, cell, event);
  
  				if (dropLocation && !calendar.isEventRangeAllowed(dropLocation, event)) {
  					disableCursor();
  					dropLocation = null;
  				}
  
  				// if a valid drop location, have the subclass render a visual indication
  				if (dropLocation && view.renderDrag(dropLocation, seg)) {
  					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 cells to be a valid drop
  				}
  			},
  			cellOut: function() { // called before mouse moves to a different cell OR moved out of all cells
  				view.unrenderDrag(); // unrender whatever was done in renderDrag
  				mouseFollower.show(); // show in case we are moving out of all cells
  				dropLocation = null;
  			},
  			cellDone: function() { // Called after a cellOut OR before a dragStop
  				enableCursor();
  			},
  			dragStop: function(ev) {
  				// do revert animation if hasn't changed. calls a callback when finished (whether animation or not)
  				mouseFollower.stop(!dropLocation, function() {
  					view.unrenderDrag();
  					view.showEvent(event);
  					_this.segDragStop(seg, ev);
  
  					if (dropLocation) {
  						view.reportEventDrop(event, dropLocation, this.largeUnit, el, ev);
  					}
  				});
  			},
  			listenStop: function() {
  				mouseFollower.stop(); // put in listenStop in case there was a mousedown but the drag never started
  			}
  		});
  
  		dragListener.mousedown(ev); // start listening, which will eventually lead to a dragStart
  	},
  
  
  	// Called before event segment dragging starts
  	segDragStart: function(seg, ev) {
  		this.isDraggingSeg = true;
  		this.view.trigger('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.trigger('eventDragStop', seg.el[0], seg.event, ev, {}); // last argument is jqui dummy
  	},
  
  
  	// Given the cell an event drag began, and the cell event was dropped, calculates the new 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.
  	computeEventDrop: function(startCell, endCell, event) {
  		var calendar = this.view.calendar;
  		var dragStart = startCell.start;
  		var dragEnd = endCell.start;
  		var delta;
  		var dropLocation;
  
  		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 normalizeEventRangeTimes
  				};
  				calendar.normalizeEventRangeTimes(dropLocation);
  			}
  			// othewise, work off existing values
  			else {
  				dropLocation = {
  					start: event.start.clone(),
  					end: event.end ? event.end.clone() : null,
  					allDay: event.allDay // keep it the same
  				};
  			}
  
  			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.each(function(i, node) {
  				// Don't use jQuery (will set an IE filter), do it the old fashioned way.
  				// In IE8, a helper element will disappears if there's a filter.
  				node.style.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 cell dropping
  	listenToExternalDrag: function(el, ev, ui) {
  		var _this = this;
  		var meta = getDraggedElMeta(el); // extra data about event drop, including possible event to create
  		var dragListener;
  		var dropLocation; // a null value signals an unsuccessful drag
  
  		// listener that tracks mouse movement over date-associated pixel regions
  		dragListener = new CellDragListener(this.coordMap, {
  			listenStart: function() {
  				_this.isDraggingExternal = true;
  			},
  			cellOver: function(cell) {
  				dropLocation = _this.computeExternalDrop(cell, meta);
  				if (dropLocation) {
  					_this.renderDrag(dropLocation); // called without a seg parameter
  				}
  				else { // invalid drop cell
  					disableCursor();
  				}
  			},
  			cellOut: function() {
  				dropLocation = null; // signal unsuccessful
  				_this.unrenderDrag();
  				enableCursor();
  			},
  			dragStop: function() {
  				_this.unrenderDrag();
  				enableCursor();
  
  				if (dropLocation) { // element was dropped on a valid date/time cell
  					_this.view.reportExternalDrop(meta, dropLocation, el, ev, ui);
  				}
  			},
  			listenStop: function() {
  				_this.isDraggingExternal = false;
  			}
  		});
  
  		dragListener.startDrag(ev); // start listening immediately
  	},
  
  
  	// Given a cell to be dropped upon, and misc data associated with the jqui drag (guaranteed to be a plain object),
  	// returns 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 cell.
  	computeExternalDrop: function(cell, meta) {
  		var dropLocation = {
  			start: cell.start.clone(),
  			end: null
  		};
  
  		// if dropped on an all-day cell, 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);
  		}
  
  		if (!this.view.calendar.isExternalDropRangeAllowed(dropLocation, meta.eventProps)) {
  			return null;
  		}
  
  		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.
  	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
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Called when the user does a mousedown on an event's resizer, which might lead to resizing.
  	// Generic enough to work with any type of Grid.
  	segResizeMousedown: function(seg, ev, 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 dragListener;
  		var resizeLocation; // falsy if invalid resize
  
  		// Tracks mouse movement over the *grid's* coordinate map
  		dragListener = new CellDragListener(this.coordMap, {
  			distance: 5,
  			scroll: view.opt('dragScroll'),
  			subjectEl: el,
  			dragStart: function(ev) {
  				_this.triggerSegMouseout(seg, ev); // ensure a mouseout on the manipulated event has been reported
  				_this.segResizeStart(seg, ev);
  			},
  			cellOver: function(cell, isOrig, origCell) {
  				resizeLocation = isStart ?
  					_this.computeEventStartResize(origCell, cell, event) :
  					_this.computeEventEndResize(origCell, cell, event);
  
  				if (resizeLocation) {
  					if (!calendar.isEventRangeAllowed(resizeLocation, event)) {
  						disableCursor();
  						resizeLocation = null;
  					}
  					// no change? (TODO: how does this work with timezones?)
  					else if (resizeLocation.start.isSame(event.start) && resizeLocation.end.isSame(eventEnd)) {
  						resizeLocation = null;
  					}
  				}
  
  				if (resizeLocation) {
  					view.hideEvent(event);
  					_this.renderEventResize(resizeLocation, seg);
  				}
  			},
  			cellOut: function() { // called before mouse moves to a different cell OR moved out of all cells
  				resizeLocation = null;
  			},
  			cellDone: function() { // resets the rendering to show the original event
  				_this.unrenderEventResize();
  				view.showEvent(event);
  				enableCursor();
  			},
  			dragStop: function(ev) {
  				_this.segResizeStop(seg, ev);
  
  				if (resizeLocation) { // valid date to resize to?
  					view.reportEventResize(event, resizeLocation, this.largeUnit, el, ev);
  				}
  			}
  		});
  
  		dragListener.mousedown(ev); // start listening, which will eventually lead to a dragStart
  	},
  
  
  	// Called before event segment resizing starts
  	segResizeStart: function(seg, ev) {
  		this.isResizingSeg = true;
  		this.view.trigger('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.trigger('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(startCell, endCell, event) {
  		return this.computeEventResize('start', startCell, endCell, event);
  	},
  
  
  	// Returns new date-information for an event segment being resized from its end
  	computeEventEndResize: function(startCell, endCell, event) {
  		return this.computeEventResize('end', startCell, endCell, event);
  	},
  
  
  	// Returns new date-information for an event segment being resized from its start OR end
  	// `type` is either 'start' or 'end'
  	computeEventResize: function(type, startCell, endCell, event) {
  		var calendar = this.view.calendar;
  		var delta = this.diffDates(endCell[type], startCell[type]);
  		var range;
  		var defaultDuration;
  
  		// build original values to work from, guaranteeing a start and end
  		range = {
  			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 (range.allDay && durationHasTime(delta)) {
  			range.allDay = false;
  			calendar.normalizeEventRangeTimes(range);
  		}
  
  		range[type].add(delta); // apply delta to start or end
  
  		// if the event was compressed too small, find a new reasonable duration for it
  		if (!range.start.isBefore(range.end)) {
  
  			defaultDuration = event.allDay ?
  				calendar.defaultAllDayEventDuration :
  				calendar.defaultTimedEventDuration;
  
  			// between the cell's duration and the event's default duration, use the smaller of the two.
  			// example: if year-length slots, and compressed to one slot, we don't want the event to be a year long
  			if (this.cellDuration && this.cellDuration < defaultDuration) {
  				defaultDuration = this.cellDuration;
  			}
  
  			if (type == 'start') { // resizing the start?
  				range.start = range.end.clone().subtract(defaultDuration);
  			}
  			else { // resizing the end?
  				range.end = range.start.clone().add(defaultDuration);
  			}
  		}
  
  		return range;
  	},
  
  
  	// 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.
  	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 event = seg.event;
  		var classes = [
  			'fc-event',
  			seg.isStart ? 'fc-start' : 'fc-not-start',
  			seg.isEnd ? 'fc-end' : 'fc-not-end'
  		].concat(
  			event.className,
  			event.source ? event.source.className : []
  		);
  
  		if (isDraggable) {
  			classes.push('fc-draggable');
  		}
  		if (isResizable) {
  			classes.push('fc-resizable');
  		}
  
  		return classes;
  	},
  
  
  	// Utility for generating event skin-related CSS properties
  	getEventSkinCss: function(event) {
  		var view = this.view;
  		var source = event.source || {};
  		var eventColor = event.color;
  		var sourceColor = source.color;
  		var optionColor = view.opt('eventColor');
  
  		return {
  			'background-color':
  				event.backgroundColor ||
  				eventColor ||
  				source.backgroundColor ||
  				sourceColor ||
  				view.opt('eventBackgroundColor') ||
  				optionColor,
  			'border-color':
  				event.borderColor ||
  				eventColor ||
  				source.borderColor ||
  				sourceColor ||
  				view.opt('eventBorderColor') ||
  				optionColor,
  			color:
  				event.textColor ||
  				source.textColor ||
  				view.opt('eventTextColor')
  		};
  	},
  
  
  	/* Converting events -> ranges -> segs
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Converts an array of event objects into an array of event segment objects.
  	// A custom `rangeToSegsFunc` may be given for arbitrarily slicing up events.
  	// Doesn't guarantee an order for the resulting array.
  	eventsToSegs: function(events, rangeToSegsFunc) {
  		var eventRanges = this.eventsToRanges(events);
  		var segs = [];
  		var i;
  
  		for (i = 0; i < eventRanges.length; i++) {
  			segs.push.apply(
  				segs,
  				this.eventRangeToSegs(eventRanges[i], rangeToSegsFunc)
  			);
  		}
  
  		return segs;
  	},
  
  
  	// Converts an array of events into an array of "range" objects.
  	// A "range" object is a plain object with start/end properties denoting the time it covers. Also an event property.
  	// For "normal" events, this will be identical to the event's start/end, but for "inverse-background" events,
  	// will create an array of ranges that span the time *not* covered by the given event.
  	// Doesn't guarantee an order for the resulting array.
  	eventsToRanges: function(events) {
  		var _this = this;
  		var eventsById = groupEventsById(events);
  		var ranges = [];
  
  		// group by ID so that related inverse-background events can be rendered together
  		$.each(eventsById, function(id, eventGroup) {
  			if (eventGroup.length) {
  				ranges.push.apply(
  					ranges,
  					isInverseBgEvent(eventGroup[0]) ?
  						_this.eventsToInverseRanges(eventGroup) :
  						_this.eventsToNormalRanges(eventGroup)
  				);
  			}
  		});
  
  		return ranges;
  	},
  
  
  	// Converts an array of "normal" events (not inverted rendering) into a parallel array of ranges
  	eventsToNormalRanges: function(events) {
  		var calendar = this.view.calendar;
  		var ranges = [];
  		var i, event;
  		var eventStart, eventEnd;
  
  		for (i = 0; i < events.length; i++) {
  			event = events[i];
  
  			// make copies and normalize by stripping timezone
  			eventStart = event.start.clone().stripZone();
  			eventEnd = calendar.getEventEnd(event).stripZone();
  
  			ranges.push({
  				event: event,
  				start: eventStart,
  				end: eventEnd,
  				eventStartMS: +eventStart,
  				eventDurationMS: eventEnd - eventStart
  			});
  		}
  
  		return ranges;
  	},
  
  
  	// Converts an array of events, with inverse-background rendering, into an array of range objects.
  	// The range objects will cover all the time NOT covered by the events.
  	eventsToInverseRanges: function(events) {
  		var view = this.view;
  		var viewStart = view.start.clone().stripZone(); // normalize timezone
  		var viewEnd = view.end.clone().stripZone(); // normalize timezone
  		var normalRanges = this.eventsToNormalRanges(events); // will give us normalized dates we can use w/o copies
  		var inverseRanges = [];
  		var event0 = events[0]; // assign this to each range's `.event`
  		var start = viewStart; // the end of the previous range. the start of the new range
  		var i, normalRange;
  
  		// ranges need to be in order. required for our date-walking algorithm
  		normalRanges.sort(compareNormalRanges);
  
  		for (i = 0; i < normalRanges.length; i++) {
  			normalRange = normalRanges[i];
  
  			// add the span of time before the event (if there is any)
  			if (normalRange.start > start) { // compare millisecond time (skip any ambig logic)
  				inverseRanges.push({
  					event: event0,
  					start: start,
  					end: normalRange.start
  				});
  			}
  
  			start = normalRange.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({
  				event: event0,
  				start: start,
  				end: viewEnd
  			});
  		}
  
  		return inverseRanges;
  	},
  
  
  	// Slices the given event range into one or more segment objects.
  	// A `rangeToSegsFunc` custom slicing function can be given.
  	eventRangeToSegs: function(eventRange, rangeToSegsFunc) {
  		var segs;
  		var i, seg;
  
  		eventRange = this.view.calendar.ensureVisibleEventRange(eventRange);
  
  		if (rangeToSegsFunc) {
  			segs = rangeToSegsFunc(eventRange);
  		}
  		else {
  			segs = this.rangeToSegs(eventRange); // defined by the subclass
  		}
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  			seg.event = eventRange.event;
  			seg.eventStartMS = eventRange.eventStartMS;
  			seg.eventDurationMS = eventRange.eventDurationMS;
  		}
  
  		return segs;
  	},
  
  
  	sortSegs: function(segs) {
  		segs.sort(proxy(this, 'compareSegs'));
  	},
  
  
  	// A cmp function for determining which segments should take visual priority
  	// DOES NOT WORK ON INVERTED BACKGROUND EVENTS because they have no eventStartMS/eventDurationMS
  	compareSegs: 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 isBgEvent(event) { // returns true if background OR inverse-background
  	var rendering = getEventRendering(event);
  	return rendering === 'background' || rendering === 'inverse-background';
  }
  
  
  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 compareNormalRanges(range1, range2) {
  	return range1.eventStartMS - range2.eventStartMS; // 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 component that renders a grid of whole-days that runs horizontally. There can be multiple rows, one per week.
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var DayGrid = Grid.extend({
  
  	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
  	breakOnWeeks: null, // should create a new row for each week? set by outside view
  
  	cellDates: null, // flat chronological array of each cell's dates
  	dayToCellOffsets: null, // maps days offsets from grid's start date, to cell offsets
  
  	rowEls: null, // set of fake row elements
  	dayEls: null, // set of whole-day elements comprising the row's background
  	helperEls: null, // set of cell skeleton elements for rendering the mock event "helper"
  
  
  	constructor: function() {
  		Grid.apply(this, arguments);
  
  		this.cellDuration = moment.duration(1, 'day'); // for Grid system
  	},
  
  
  	// 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 cellCnt = rowCnt * colCnt;
  		var html = '';
  		var row;
  		var i, cell;
  
  		for (row = 0; row < rowCnt; row++) {
  			html += this.dayRowHtml(row, isRigid);
  		}
  		this.el.html(html);
  
  		this.rowEls = this.el.find('.fc-row');
  		this.dayEls = this.el.find('.fc-day');
  
  		// trigger dayRender with each cell's element
  		for (i = 0; i < cellCnt; i++) {
  			cell = this.getCell(i);
  			view.trigger('dayRender', null, cell.start, this.dayEls.eq(i));
  		}
  	},
  
  
  	unrenderDates: function() {
  		this.removeSegPopover();
  	},
  
  
  	renderBusinessHours: function() {
  		var events = this.view.calendar.getBusinessHoursEvents(true); // wholeDay=true
  		var segs = this.eventsToSegs(events);
  
  		this.renderFill('businessHours', segs, 'bgevent');
  	},
  
  
  	// Generates the HTML for a single row. `row` is the row number.
  	dayRowHtml: 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.rowHtml('day', row) + // leverages RowRenderer. calls dayCellHtml()
  					'</table>' +
  				'</div>' +
  				'<div class="fc-content-skeleton">' +
  					'<table>' +
  						(this.numbersVisible ?
  							'<thead>' +
  								this.rowHtml('number', row) + // leverages RowRenderer. View will define render method
  							'</thead>' :
  							''
  							) +
  					'</table>' +
  				'</div>' +
  			'</div>';
  	},
  
  
  	// Renders the HTML for a whole-day cell. Will eventually end up in the day-row's background.
  	// We go through a 'day' row type instead of just doing a 'bg' row type so that the View can do custom rendering
  	// specifically for whole-day rows, whereas a 'bg' might also be used for other purposes (TimeGrid bg for example).
  	dayCellHtml: function(cell) {
  		return this.bgCellHtml(cell);
  	},
  
  
  	/* Options
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Computes a default column header formatting string if `colFormat` is not explicitly defined
  	computeColHeadFormat: function() {
  		if (this.rowCnt > 1) { // more than one week row. day numbers will be in each cell
  			return 'ddd'; // "Sat"
  		}
  		else if (this.colCnt > 1) { // multiple days, so full single date string WON'T be in title text
  			return this.view.opt('dayOfMonthFormat'); // "Sat 12/10"
  		}
  		else { // single day, so full single date string will probably be in title text
  			return 'dddd'; // "Saturday"
  		}
  	},
  
  
  	// 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
  	},
  
  
  	/* Cell System
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	rangeUpdated: function() {
  		var cellDates;
  		var firstDay;
  		var rowCnt;
  		var colCnt;
  
  		this.updateCellDates(); // populates cellDates and dayToCellOffsets
  		cellDates = this.cellDates;
  
  		if (this.breakOnWeeks) {
  			// count columns until the day-of-week repeats
  			firstDay = cellDates[0].day();
  			for (colCnt = 1; colCnt < cellDates.length; colCnt++) {
  				if (cellDates[colCnt].day() == firstDay) {
  					break;
  				}
  			}
  			rowCnt = Math.ceil(cellDates.length / colCnt);
  		}
  		else {
  			rowCnt = 1;
  			colCnt = cellDates.length;
  		}
  
  		this.rowCnt = rowCnt;
  		this.colCnt = colCnt;
  	},
  
  
  	// Populates cellDates and dayToCellOffsets
  	updateCellDates: function() {
  		var view = this.view;
  		var date = this.start.clone();
  		var dates = [];
  		var offset = -1;
  		var offsets = [];
  
  		while (date.isBefore(this.end)) { // loop each day from start to end
  			if (view.isHiddenDay(date)) {
  				offsets.push(offset + 0.5); // mark that it's between offsets
  			}
  			else {
  				offset++;
  				offsets.push(offset);
  				dates.push(date.clone());
  			}
  			date.add(1, 'days');
  		}
  
  		this.cellDates = dates;
  		this.dayToCellOffsets = offsets;
  	},
  
  
  	// Given a cell object, generates its start date. Returns a reference-free copy.
  	computeCellDate: function(cell) {
  		var colCnt = this.colCnt;
  		var index = cell.row * colCnt + (this.isRTL ? colCnt - cell.col - 1 : cell.col);
  
  		return this.cellDates[index].clone();
  	},
  
  
  	// Retrieves the element representing the given row
  	getRowEl: function(row) {
  		return this.rowEls.eq(row);
  	},
  
  
  	// Retrieves the element representing the given column
  	getColEl: function(col) {
  		return this.dayEls.eq(col);
  	},
  
  
  	// Gets the whole-day element associated with the cell
  	getCellDayEl: function(cell) {
  		return this.dayEls.eq(cell.row * this.colCnt + cell.col);
  	},
  
  
  	// Overrides Grid's method for when row coordinates are computed
  	computeRowCoords: function() {
  		var rowCoords = Grid.prototype.computeRowCoords.call(this); // call the super-method
  
  		// hack for extending last row (used by AgendaView)
  		rowCoords[rowCoords.length - 1].bottom += this.bottomCoordPadding;
  
  		return rowCoords;
  	},
  
  
  	/* Dates
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Slices up a date range by row into an array of segments
  	rangeToSegs: function(range) {
  		var isRTL = this.isRTL;
  		var rowCnt = this.rowCnt;
  		var colCnt = this.colCnt;
  		var segs = [];
  		var first, last; // inclusive cell-offset range for given range
  		var row;
  		var rowFirst, rowLast; // inclusive cell-offset range for current row
  		var isStart, isEnd;
  		var segFirst, segLast; // inclusive cell-offset range for segment
  		var seg;
  
  		range = this.view.computeDayRange(range); // make whole-day range, considering nextDayThreshold
  		first = this.dateToCellOffset(range.start);
  		last = this.dateToCellOffset(range.end.subtract(1, 'days')); // offset of inclusive end date
  
  		for (row = 0; row < rowCnt; row++) {
  			rowFirst = row * colCnt;
  			rowLast = rowFirst + colCnt - 1;
  
  			// intersect segment's offset range with the row's
  			segFirst = Math.max(rowFirst, first);
  			segLast = Math.min(rowLast, last);
  
  			// 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?
  
  				// must be matching integers to be the segment's start/end
  				isStart = segFirst === first;
  				isEnd = segLast === last;
  
  				// translate offsets to be relative to start-of-row
  				segFirst -= rowFirst;
  				segLast -= rowFirst;
  
  				seg = { row: row, isStart: isStart, isEnd: isEnd };
  				if (isRTL) {
  					seg.leftCol = colCnt - segLast - 1;
  					seg.rightCol = colCnt - segFirst - 1;
  				}
  				else {
  					seg.leftCol = segFirst;
  					seg.rightCol = segLast;
  				}
  				segs.push(seg);
  			}
  		}
  
  		return segs;
  	},
  
  
  	// Given a date, returns its chronolocial cell-offset 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.
  	dateToCellOffset: function(date) {
  		var offsets = this.dayToCellOffsets;
  		var day = date.diff(this.start, 'days');
  
  		if (day < 0) {
  			return offsets[0] - 1;
  		}
  		else if (day >= offsets.length) {
  			return offsets[offsets.length - 1] + 1;
  		}
  		else {
  			return offsets[day];
  		}
  	},
  
  
  	/* 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.
  	// The dropLocation's end can be null. seg can be null. See Grid::renderDrag for more info.
  	renderDrag: function(dropLocation, seg) {
  
  		// always render a highlight underneath
  		this.renderHighlight(this.eventRangeToSegs(dropLocation));
  
  		// if a segment from the same calendar but another component is being dragged, render a helper event
  		if (seg && !seg.el.closest(this.el).length) {
  
  			this.renderRangeHelper(dropLocation, seg);
  			this.applyDragOpacity(this.helperEls);
  
  			return true; // a helper has been rendered
  		}
  	},
  
  
  	// 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(range, seg) {
  		this.renderHighlight(this.eventRangeToSegs(range));
  		this.renderRangeHelper(range, seg);
  	},
  
  
  	// 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.eventsToSegs([ 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]);
  		});
  
  		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, type);
  
  		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.getEventSkinCss(event));
  		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, 'eventSkeleton');
  			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.sortSegs(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 cell;
  		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) {
  				cell = _this.getCell(row, col);
  				segsBelow = _this.getCellSegs(cell, levelLimit);
  				if (segsBelow.length) {
  					td = cellMatrix[levelLimit - 1][col];
  					moreLink = _this.renderMoreLink(cell, 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) {
  					cell = this.getCell(row, col);
  					segsBelow = this.getCellSegs(cell, 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];
  						cell = this.getCell(row, seg.leftCol + j);
  						moreLink = this.renderMoreLink(cell, [ 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(cell, 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 = cell.start;
  				var moreEl = $(this);
  				var dayEl = _this.getCellDayEl(cell);
  				var allSegs = _this.getCellSegs(cell);
  
  				// 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.trigger('eventLimitClick', null, {
  						date: date,
  						dayEl: dayEl,
  						moreEl: moreEl,
  						segs: reslicedAllSegs,
  						hiddenSegs: reslicedHiddenSegs
  					}, ev);
  				}
  
  				if (clickOption === 'popover') {
  					_this.showSegPopover(cell, 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(cell, 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(cell.row); // will align with top of row
  		}
  
  		options = {
  			className: 'fc-more-popover',
  			content: this.renderSegPopoverContent(cell, segs),
  			parentEl: this.el,
  			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
  				_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();
  	},
  
  
  	// Builds the inner DOM contents of the segment popover
  	renderSegPopoverContent: function(cell, segs) {
  		var view = this.view;
  		var isTheme = view.opt('theme');
  		var title = cell.start.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
  			segs[i].cell = cell;
  
  			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().stripTime();
  		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 = intersectionToSeg(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.sortSegs(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(cell, startLevel) {
  		var segMatrix = this.rowStructs[cell.row].segMatrix;
  		var level = startLevel || 0;
  		var segs = [];
  		var seg;
  
  		while (level < segMatrix.length) {
  			seg = segMatrix[level][cell.col];
  			if (seg) {
  				segs.push(seg);
  			}
  			level++;
  		}
  
  		return segs;
  	}
  
  });
  
  ;;
  
  /* A component that renders one or more columns of vertical time slots
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var TimeGrid = Grid.extend({
  
  	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
  	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
  	colDates: null, // whole-day dates for each column. left to right
  	labelFormat: null, // formatting string for times running along vertical axis
  	labelInterval: null, // duration of how often a label should be displayed for a slot
  
  	dayEls: null, // cells elements in the day-row background
  	slatEls: null, // elements running horizontally across all columns
  
  	slatTops: null, // an array of top positions, relative to the container. last item holds bottom of last slot
  
  	helperEl: null, // cell skeleton element for rendering the mock event "helper"
  
  	businessHourSegs: 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.dayEls = this.el.find('.fc-day');
  		this.slatEls = this.el.find('.fc-slats tr');
  	},
  
  
  	renderBusinessHours: function() {
  		var events = this.view.calendar.getBusinessHoursEvents();
  		this.businessHourSegs = this.renderFill('businessHours', this.eventsToSegs(events), 'bgevent');
  	},
  
  
  	// Renders the basic HTML skeleton for the grid
  	renderHtml: function() {
  		return '' +
  			'<div class="fc-bg">' +
  				'<table>' +
  					this.rowHtml('slotBg') + // leverages RowRenderer, which will call slotBgCellHtml
  				'</table>' +
  			'</div>' +
  			'<div class="fc-slats">' +
  				'<table>' +
  					this.slatRowHtml() +
  				'</table>' +
  			'</div>';
  	},
  
  
  	// Renders the HTML for a vertical background cell behind the slots.
  	// This method is distinct from 'bg' because we wanted a new `rowType` so the View could customize the rendering.
  	slotBgCellHtml: function(cell) {
  		return this.bgCellHtml(cell);
  	},
  
  
  	// Generates the HTML for the horizontal "slats" that run width-wise. Has a time axis on a side. Depends on RTL.
  	slatRowHtml: 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); // after .time() will be in UTC. but that's good, avoids DST issues
  			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 ' + (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.cellDuration = snapDuration; // for Grid system
  
  		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('axisFormat') || // deprecated
  			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 column header formatting string if `colFormat` is not explicitly defined
  	computeColHeadFormat: function() {
  		if (this.colCnt > 1) { // multiple days, so full single date string WON'T be in title text
  			return this.view.opt('dayOfMonthFormat'); // "Sat 12/10"
  		}
  		else { // single day, so full single date string will probably be in title text
  			return 'dddd'; // "Saturday"
  		}
  	},
  
  
  	// 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;
  	},
  
  
  	/* Cell System
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	rangeUpdated: function() {
  		var view = this.view;
  		var colDates = [];
  		var date;
  
  		date = this.start.clone();
  		while (date.isBefore(this.end)) {
  			colDates.push(date.clone());
  			date.add(1, 'day');
  			date = view.skipHiddenDays(date);
  		}
  
  		if (this.isRTL) {
  			colDates.reverse();
  		}
  
  		this.colDates = colDates;
  		this.colCnt = colDates.length;
  		this.rowCnt = Math.ceil((this.maxTime - this.minTime) / this.snapDuration); // # of vertical snaps
  	},
  
  
  	// Given a cell object, generates its start date. Returns a reference-free copy.
  	computeCellDate: function(cell) {
  		var date = this.colDates[cell.col];
  		var time = this.computeSnapTime(cell.row);
  
  		date = this.view.calendar.rezoneDate(date); // give it a 00:00 time
  		date.time(time);
  
  		return date;
  	},
  
  
  	// Retrieves the element representing the given column
  	getColEl: function(col) {
  		return this.dayEls.eq(col);
  	},
  
  
  	/* Dates
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Given a row number of the grid, representing a "snap", returns a time (Duration) from its start-of-day
  	computeSnapTime: function(row) {
  		return moment.duration(this.minTime + this.snapDuration * row);
  	},
  
  
  	// Slices up a date range by column into an array of segments
  	rangeToSegs: function(range) {
  		var colCnt = this.colCnt;
  		var segs = [];
  		var seg;
  		var col;
  		var colDate;
  		var colRange;
  
  		// normalize :(
  		range = {
  			start: range.start.clone().stripZone(),
  			end: range.end.clone().stripZone()
  		};
  
  		for (col = 0; col < colCnt; col++) {
  			colDate = this.colDates[col]; // will be ambig time/timezone
  			colRange = {
  				start: colDate.clone().time(this.minTime),
  				end: colDate.clone().time(this.maxTime)
  			};
  			seg = intersectionToSeg(range, colRange); // both will be ambig timezone
  			if (seg) {
  				seg.col = col;
  				segs.push(seg);
  			}
  		}
  
  		return segs;
  	},
  
  
  	/* Coordinates
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	updateSize: function(isResize) { // NOT a standard Grid method
  		this.computeSlatTops();
  
  		if (isResize) {
  			this.updateSegVerticals();
  		}
  	},
  
  
  	// Computes the top/bottom coordinates of each "snap" rows
  	computeRowCoords: function() {
  		var originTop = this.el.offset().top;
  		var items = [];
  		var i;
  		var item;
  
  		for (i = 0; i < this.rowCnt; i++) {
  			item = {
  				top: originTop + this.computeTimeTop(this.computeSnapTime(i))
  			};
  			if (i > 0) {
  				items[i - 1].bottom = item.top;
  			}
  			items.push(item);
  		}
  		item.bottom = item.top + this.computeTimeTop(this.computeSnapTime(i));
  
  		return items;
  	},
  
  
  	// 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.clone().stripZone() - startOfDayDate.clone().stripTime()
  			)
  		);
  	},
  
  
  	// Computes the top coordinate, relative to the bounds of the grid, of the given time (a Duration).
  	computeTimeTop: function(time) {
  		var slatCoverage = (time - this.minTime) / this.slotDuration; // floating-point value of # of slots covered
  		var slatIndex;
  		var slatRemainder;
  		var slatTop;
  		var slatBottom;
  
  		// constrain. because minTime/maxTime might be customized
  		slatCoverage = Math.max(0, slatCoverage);
  		slatCoverage = Math.min(this.slatEls.length, slatCoverage);
  
  		slatIndex = Math.floor(slatCoverage); // an integer index of the furthest whole slot
  		slatRemainder = slatCoverage - slatIndex;
  		slatTop = this.slatTops[slatIndex]; // the top position of the furthest whole slot
  
  		if (slatRemainder) { // time spans part-way into the slot
  			slatBottom = this.slatTops[slatIndex + 1];
  			return slatTop + (slatBottom - slatTop) * slatRemainder; // part-way between slots
  		}
  		else {
  			return slatTop;
  		}
  	},
  
  
  	// Queries each `slatEl` for its position relative to the grid's container and stores it in `slatTops`.
  	// Includes the the bottom of the last slat as the last item in the array.
  	computeSlatTops: function() {
  		var tops = [];
  		var top;
  
  		this.slatEls.each(function(i, node) {
  			top = $(node).position().top;
  			tops.push(top);
  		});
  
  		tops.push(top + this.slatEls.last().outerHeight()); // bottom of the last slat
  
  		this.slatTops = tops;
  	},
  
  
  	/* Event Drag Visualization
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders a visual indication of an event being dragged over the specified date(s).
  	// dropLocation's end might be null, as well as `seg`. See Grid::renderDrag for more info.
  	// A returned value of `true` signals that a mock "helper" event has been rendered.
  	renderDrag: function(dropLocation, seg) {
  
  		if (seg) { // if there is event information for this drag, render a helper event
  			this.renderRangeHelper(dropLocation, seg);
  			this.applyDragOpacity(this.helperEl);
  
  			return true; // signal that a helper has been rendered
  		}
  		else {
  			// otherwise, just render a highlight
  			this.renderHighlight(this.eventRangeToSegs(dropLocation));
  		}
  	},
  
  
  	// 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(range, seg) {
  		this.renderRangeHelper(range, seg);
  	},
  
  
  	// 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) {
  		var segs = this.eventsToSegs([ event ]);
  		var tableEl;
  		var i, seg;
  		var sourceEl;
  
  		segs = this.renderFgSegEls(segs); // assigns each seg's el and returns a subset of segs that were rendered
  		tableEl = this.renderSegTable(segs);
  
  		// 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')
  				});
  			}
  		}
  
  		this.helperEl = $('<div class="fc-helper-skeleton"/>')
  			.append(tableEl)
  				.appendTo(this.el);
  	},
  
  
  	// Unrenders any mock helper event
  	unrenderHelper: function() {
  		if (this.helperEl) {
  			this.helperEl.remove();
  			this.helperEl = null;
  		}
  	},
  
  
  	/* Selection
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders a visual indication of a selection. Overrides the default, which was to simply render a highlight.
  	renderSelection: function(range) {
  		if (this.view.opt('selectHelper')) { // this setting signals that a mock helper event should be rendered
  			this.renderRangeHelper(range);
  		}
  		else {
  			this.renderHighlight(this.selectionRangeToSegs(range));
  		}
  	},
  
  
  	// Unrenders any visual indication of a selection
  	unrenderSelection: function() {
  		this.unrenderHelper();
  		this.unrenderHighlight();
  	},
  
  
  	/* Fill System (highlight, background events, business hours)
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders a set of rectangles over the given time segments.
  	// Only returns segments that successfully rendered.
  	renderFill: function(type, segs, className) {
  		var segCols;
  		var skeletonEl;
  		var trEl;
  		var col, colSegs;
  		var tdEl;
  		var containerEl;
  		var dayDate;
  		var i, seg;
  
  		if (segs.length) {
  
  			segs = this.renderFillSegEls(type, segs); // assignes `.el` to each seg. returns successfully rendered segs
  			segCols = this.groupSegCols(segs); // group into sub-arrays, and assigns 'col' to each seg
  
  			className = className || type.toLowerCase();
  			skeletonEl = $(
  				'<div class="fc-' + className + '-skeleton">' +
  					'<table><tr/></table>' +
  				'</div>'
  			);
  			trEl = skeletonEl.find('tr');
  
  			for (col = 0; col < segCols.length; col++) {
  				colSegs = segCols[col];
  				tdEl = $('<td/>').appendTo(trEl);
  
  				if (colSegs.length) {
  					containerEl = $('<div class="fc-' + className + '-container"/>').appendTo(tdEl);
  					dayDate = this.colDates[col];
  
  					for (i = 0; i < colSegs.length; i++) {
  						seg = colSegs[i];
  						containerEl.append(
  							seg.el.css({
  								top: this.computeDateTop(seg.start, dayDate),
  								bottom: -this.computeDateTop(seg.end, dayDate) // the y position of the bottom edge
  							})
  						);
  					}
  				}
  			}
  
  			this.bookendCells(trEl, type);
  
  			this.el.append(skeletonEl);
  			this.elsByFill[type] = skeletonEl;
  		}
  
  		return segs;
  	}
  
  });
  
  ;;
  
  /* Event-rendering methods for the TimeGrid class
  ----------------------------------------------------------------------------------------------------------------------*/
  
  TimeGrid.mixin({
  
  	eventSkeletonEl: null, // has cells with event-containers, which contain absolutely positioned event elements
  
  
  	// Renders the given foreground event segments onto the grid
  	renderFgSegs: function(segs) {
  		segs = this.renderFgSegEls(segs); // returns a subset of the segs. segs that were actually rendered
  
  		this.el.append(
  			this.eventSkeletonEl = $('<div class="fc-content-skeleton"/>')
  				.append(this.renderSegTable(segs))
  		);
  
  		return segs; // return only the segs that were actually rendered
  	},
  
  
  	// Unrenders all currently rendered foreground event segments
  	unrenderFgSegs: function(segs) {
  		if (this.eventSkeletonEl) {
  			this.eventSkeletonEl.remove();
  			this.eventSkeletonEl = null;
  		}
  	},
  
  
  	// Renders and returns the <table> portion of the event-skeleton.
  	// Returns an object with properties 'tbodyEl' and 'segs'.
  	renderSegTable: function(segs) {
  		var tableEl = $('<table><tr/></table>');
  		var trEl = tableEl.find('tr');
  		var segCols;
  		var i, seg;
  		var col, colSegs;
  		var containerEl;
  
  		segCols = this.groupSegCols(segs); // group into sub-arrays, and assigns 'col' to each seg
  
  		this.computeSegVerticals(segs); // compute and assign top/bottom
  
  		for (col = 0; col < segCols.length; col++) { // iterate each column grouping
  			colSegs = segCols[col];
  			this.placeSlotSegs(colSegs); // compute horizontal coordinates, z-index's, and reorder the array
  
  			containerEl = $('<div class="fc-event-container"/>');
  
  			// assign positioning CSS and insert into container
  			for (i = 0; i < colSegs.length; i++) {
  				seg = colSegs[i];
  				seg.el.css(this.generateSegPositionCss(seg));
  
  				// if the height is short, add a className for alternate styling
  				if (seg.bottom - seg.top < 30) {
  					seg.el.addClass('fc-short');
  				}
  
  				containerEl.append(seg.el);
  			}
  
  			trEl.append($('<td/>').append(containerEl));
  		}
  
  		this.bookendCells(trEl, 'eventSkeleton');
  
  		return tableEl;
  	},
  
  
  	// 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!
  	placeSlotSegs: function(segs) {
  		var levels;
  		var level0;
  		var i;
  
  		this.sortSegs(segs); // order by date
  		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.computeSlotSegCoords(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.
  	computeSlotSegCoords: 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.sortForwardSlotSegs(forwardSegs);
  
  				// this segment's forwardCoord will be calculated from the backwardCoord of the
  				// highest-pressure forward segment.
  				this.computeSlotSegCoords(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.computeSlotSegCoords(forwardSegs[i], 0, seg.forwardCoord);
  			}
  		}
  	},
  
  
  	// Refreshes the CSS top/bottom coordinates for each segment element. Probably after a window resize/zoom.
  	// Repositions business hours segs too, so not just for events. Maybe shouldn't be here.
  	updateSegVerticals: function() {
  		var allSegs = (this.segs || []).concat(this.businessHourSegs || []);
  		var i;
  
  		this.computeSegVerticals(allSegs);
  
  		for (i = 0; i < allSegs.length; i++) {
  			allSegs[i].el.css(
  				this.generateSegVerticalCss(allSegs[i])
  			);
  		}
  	},
  
  
  	// 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);
  		}
  	},
  
  
  	// 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.getEventSkinCss(event));
  		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>';
  	},
  
  
  	// 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.
  	generateSegPositionCss: 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;
  	},
  
  
  	// 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
  		};
  	},
  
  
  	// Given a flat array of segments, return an array of sub-arrays, grouped by each segment's col
  	groupSegCols: function(segs) {
  		var segCols = [];
  		var i;
  
  		for (i = 0; i < this.colCnt; i++) {
  			segCols.push([]);
  		}
  
  		for (i = 0; i < segs.length; i++) {
  			segCols[segs[i].col].push(segs[i]);
  		}
  
  		return segCols;
  	},
  
  
  	sortForwardSlotSegs: function(forwardSegs) {
  		forwardSegs.sort(proxy(this, 'compareForwardSlotSegs'));
  	},
  
  
  	// A cmp function for determining which forward segment to rely on more when computing coordinates.
  	compareForwardSlotSegs: 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.compareSegs(seg1, seg2);
  	}
  
  });
  
  
  // 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({
  
  	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
  	coordMap: null, // a CoordMap object for converting pixel regions to dates
  	el: null, // the view's containing element. set by Calendar
  
  	displaying: null, // a promise representing the state of rendering. null if no render requested
  	isSkeletonRendered: false,
  	isEventsRendered: false,
  
  	// 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
  
  	eventOrderSpecs: null, // criteria for ordering events when they have same date/time
  
  	// subclasses can optionally use a scroll container
  	scrollerEl: null, // the element that will most likely scroll when content is too tall
  	scrollTop: null, // cached vertical scroll value
  
  	// classNames styled by jqui themes
  	widgetHeaderClass: null,
  	widgetContentClass: null,
  	highlightStateClass: null,
  
  	// for date utils, computed from options
  	nextDayThreshold: null,
  	isHiddenDayHash: null,
  
  	// document handlers, bound to `this` object
  	documentMousedownProxy: null, // TODO: doesn't work with touch
  
  
  	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.documentMousedownProxy = proxy(this, 'documentMousedown');
  
  		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.
  	trigger: function(name, thisObj) { // arguments beyond thisObj are passed along
  		var calendar = this.calendar;
  
  		return calendar.trigger.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
  			)
  		);
  	},
  
  
  	/* Dates
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Updates all internal dates to center around the given current date
  	setDate: function(date) {
  		this.setRange(this.computeRange(date));
  	},
  
  
  	// Updates all internal dates for displaying the given range.
  	// Expects all values to be normalized (like what computeRange does).
  	setRange: function(range) {
  		$.extend(this, range);
  		this.updateTitle();
  	},
  
  
  	// Given a single current 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.rezoneDate(intervalStart); // convert to current timezone, with 00:00
  			}
  			if (!intervalEnd.hasTime()) {
  				intervalEnd = this.calendar.rezoneDate(intervalEnd); // convert to current timezone, with 00:00
  			}
  		}
  
  		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();
  	},
  
  
  	// Computes what the title at the top of the calendar should be for this view
  	computeTitle: function() {
  		return this.formatRange(
  			{ start: this.intervalStart, end: this.intervalEnd },
  			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.
  	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'));
  	},
  
  
  	/* Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Sets the container element that the view should render inside of.
  	// Does other DOM-related initializations.
  	setElement: function(el) {
  		this.el = el;
  		this.bindGlobalHandlers();
  	},
  
  
  	// Removes the view's container element from the DOM, clearing any content beforehand.
  	// Undoes any other DOM-related attachments.
  	removeElement: function() {
  		this.clear(); // clears all content
  
  		// clean up the skeleton
  		if (this.isSkeletonRendered) {
  			this.unrenderSkeleton();
  			this.isSkeletonRendered = false;
  		}
  
  		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.
  	},
  
  
  	// Does everything necessary to display the view centered around the given date.
  	// Does every type of rendering EXCEPT rendering events.
  	// Is asychronous and returns a promise.
  	display: function(date) {
  		var _this = this;
  		var scrollState = null;
  
  		if (this.displaying) {
  			scrollState = this.queryScroll();
  		}
  
  		return this.clear().then(function() { // clear the content first (async)
  			return (
  				_this.displaying =
  					$.when(_this.displayView(date)) // displayView might return a promise
  						.then(function() {
  							_this.forceScroll(_this.computeInitialScroll(scrollState));
  							_this.triggerRender();
  						})
  			);
  		});
  	},
  
  
  	// Does everything necessary to clear the content of the view.
  	// Clears dates and events. Does not clear the skeleton.
  	// Is asychronous and returns a promise.
  	clear: function() {
  		var _this = this;
  		var displaying = this.displaying;
  
  		if (displaying) { // previously displayed, or in the process of being displayed?
  			return displaying.then(function() { // wait for the display to finish
  				_this.displaying = null;
  				_this.clearEvents();
  				return _this.clearView(); // might return a promise. chain it
  			});
  		}
  		else {
  			return $.when(); // an immediately-resolved promise
  		}
  	},
  
  
  	// Displays the view's non-event content, such as date-related content or anything required by events.
  	// Renders the view's non-content skeleton if necessary.
  	// Can be asynchronous and return a promise.
  	displayView: function(date) {
  		if (!this.isSkeletonRendered) {
  			this.renderSkeleton();
  			this.isSkeletonRendered = true;
  		}
  		this.setDate(date);
  		if (this.render) {
  			this.render(); // TODO: deprecate
  		}
  		this.renderDates();
  		this.updateSize();
  		this.renderBusinessHours(); // might need coordinates, so should go after updateSize()
  	},
  
  
  	// Unrenders the view content that was rendered in displayView.
  	// Can be asynchronous and return a promise.
  	clearView: function() {
  		this.unselect();
  		this.triggerUnrender();
  		this.unrenderBusinessHours();
  		this.unrenderDates();
  		if (this.destroy) {
  			this.destroy(); // TODO: deprecate
  		}
  	},
  
  
  	// 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
  	},
  
  
  	// Renders the view's date-related content (like cells that represent days/times).
  	// Assumes setRange has already been called and the skeleton has already been rendered.
  	renderDates: function() {
  		// subclasses should implement
  	},
  
  
  	// Unrenders the view's date-related content
  	unrenderDates: function() {
  		// subclasses should override
  	},
  
  
  	// 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
  	},
  
  
  	// Signals that the view's content has been rendered
  	triggerRender: function() {
  		this.trigger('viewRender', this, this, this.el);
  	},
  
  
  	// Signals that the view's content is about to be unrendered
  	triggerUnrender: function() {
  		this.trigger('viewDestroy', this, this, this.el);
  	},
  
  
  	// Binds DOM handlers to elements that reside outside the view container, such as the document
  	bindGlobalHandlers: function() {
  		$(document).on('mousedown', this.documentMousedownProxy);
  	},
  
  
  	// Unbinds DOM handlers from elements that reside outside the view container
  	unbindGlobalHandlers: function() {
  		$(document).off('mousedown', this.documentMousedownProxy);
  	},
  
  
  	// 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';
  	},
  
  
  	/* Dimensions
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Refreshes anything dependant upon sizing of the container element of the grid
  	updateSize: function(isResize) {
  		var scrollState;
  
  		if (isResize) {
  			scrollState = this.queryScroll();
  		}
  
  		this.updateHeight(isResize);
  		this.updateWidth(isResize);
  
  		if (isResize) {
  			this.setScroll(scrollState);
  		}
  	},
  
  
  	// 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
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Given the total height of the view, return the number of pixels that should be used for the scroller.
  	// Utility for subclasses.
  	computeScrollerHeight: function(totalHeight) {
  		var scrollerEl = this.scrollerEl;
  		var both;
  		var otherHeight; // cumulative height of everything that is not the scrollerEl in the view (header+borders)
  
  		both = this.el.add(scrollerEl);
  
  		// fuckin 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
  		});
  		otherHeight = this.el.outerHeight() - scrollerEl.height(); // grab the dimensions
  		both.css({ position: '', left: '' }); // undo hack
  
  		return totalHeight - otherHeight;
  	},
  
  
  	// Computes the initial pre-configured scroll state prior to allowing the user to change it.
  	// Given the scroll state from the previous rendering. If first time rendering, given null.
  	computeInitialScroll: function(previousScrollState) {
  		return 0;
  	},
  
  
  	// Retrieves the view's current natural scroll state. Can return an arbitrary format.
  	queryScroll: function() {
  		if (this.scrollerEl) {
  			return this.scrollerEl.scrollTop(); // operates on scrollerEl by default
  		}
  	},
  
  
  	// Sets the view's scroll state. Will accept the same format computeInitialScroll and queryScroll produce.
  	setScroll: function(scrollState) {
  		if (this.scrollerEl) {
  			return this.scrollerEl.scrollTop(scrollState); // operates on scrollerEl by default
  		}
  	},
  
  
  	// Sets the scroll state, making sure to overcome any predefined scroll value the browser has in mind
  	forceScroll: function(scrollState) {
  		var _this = this;
  
  		this.setScroll(scrollState);
  		setTimeout(function() {
  			_this.setScroll(scrollState);
  		}, 0);
  	},
  
  
  	/* Event Elements / Segments
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Does everything necessary to display the given events onto the current view
  	displayEvents: function(events) {
  		var scrollState = this.queryScroll();
  
  		this.clearEvents();
  		this.renderEvents(events);
  		this.isEventsRendered = true;
  		this.setScroll(scrollState);
  		this.triggerEventRender();
  	},
  
  
  	// Does everything necessary to clear the view's currently-rendered events
  	clearEvents: function() {
  		if (this.isEventsRendered) {
  			this.triggerEventUnrender();
  			if (this.destroyEvents) {
  				this.destroyEvents(); // TODO: deprecate
  			}
  			this.unrenderEvents();
  			this.isEventsRendered = false;
  		}
  	},
  
  
  	// Renders the events onto the view.
  	renderEvents: function(events) {
  		// subclasses should implement
  	},
  
  
  	// Removes event elements from the view.
  	unrenderEvents: function() {
  		// subclasses should implement
  	},
  
  
  	// Signals that all events have been rendered
  	triggerEventRender: function() {
  		this.renderedEventSegEach(function(seg) {
  			this.trigger('eventAfterRender', seg.event, seg.event, seg.el);
  		});
  		this.trigger('eventAfterAllRender');
  	},
  
  
  	// Signals that all event elements are about to be removed
  	triggerEventUnrender: function() {
  		this.renderedEventSegEach(function(seg) {
  			this.trigger('eventDestroy', seg.event, seg.event, seg.el);
  		});
  	},
  
  
  	// 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.trigger('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) {
  		var source = event.source || {};
  
  		return firstDefined(
  			event.startEditable,
  			source.startEditable,
  			this.opt('eventStartEditable'),
  			event.editable,
  			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 start/end/allDay values for the event.
  	reportEventDrop: function(event, dropLocation, largeUnit, el, ev) {
  		var calendar = this.calendar;
  		var mutateResult = calendar.mutateEvent(event, dropLocation, largeUnit);
  		var undoFunc = function() {
  			mutateResult.undo();
  			calendar.reportEventChange();
  		};
  
  		this.triggerEventDrop(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.trigger('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 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.trigger('drop', el[0], dropLocation.start, ev, ui);
  
  		if (event) {
  			this.trigger('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`
  	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
  	reportEventResize: function(event, resizeLocation, largeUnit, el, ev) {
  		var calendar = this.calendar;
  		var mutateResult = calendar.mutateEvent(event, resizeLocation, largeUnit);
  		var undoFunc = function() {
  			mutateResult.undo();
  			calendar.reportEventChange();
  		};
  
  		this.triggerEventResize(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.trigger('eventResize', el[0], event, durationDelta, undoFunc, ev, {}); // {} = jqui dummy
  	},
  
  
  	/* Selection
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Selects a date range on the view. `start` and `end` are both Moments.
  	// `ev` is the native mouse event that begin the interaction.
  	select: function(range, ev) {
  		this.unselect(ev);
  		this.renderSelection(range);
  		this.reportSelection(range, ev);
  	},
  
  
  	// Renders a visual indication of the selection
  	renderSelection: function(range) {
  		// subclasses should implement
  	},
  
  
  	// Called when a new selection is made. Updates internal state and triggers handlers.
  	reportSelection: function(range, ev) {
  		this.isSelected = true;
  		this.triggerSelect(range, ev);
  	},
  
  
  	// Triggers handlers to 'select'
  	triggerSelect: function(range, ev) {
  		this.trigger('select', null, range.start, range.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.trigger('unselect', null, ev);
  		}
  	},
  
  
  	// Unrenders a visual indication of selection
  	unrenderSelection: function() {
  		// subclasses should implement
  	},
  
  
  	// Handler for unselecting when the user clicks something and the 'unselectAuto' setting is on
  	documentMousedown: function(ev) {
  		var ignore;
  
  		// is there a selection, and has the user made a proper left click?
  		if (this.isSelected && this.opt('unselectAuto') && isPrimaryMouseButton(ev)) {
  
  			// 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);
  			}
  		}
  	},
  
  
  	/* Day Click
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Triggers handlers to 'dayClick'
  	triggerDayClick: function(cell, dayEl, ev) {
  		this.trigger('dayClick', dayEl, cell.start, 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;
  	}
  
  });
  
  ;;
  
  var Calendar = fc.Calendar = Class.extend({
  
  	dirDefaults: null, // option defaults related to LTR or RTL
  	langDefaults: null, // option defaults related to current locale
  	overrides: null, // option overrides given to the fullCalendar constructor
  	options: null, // all defaults combined with overrides
  	viewSpecCache: null, // cache of view definitions
  	view: null, // current View object
  	header: 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() {
  	},
  
  
  	// Initializes `this.options` and other important options-related objects
  	initOptions: function(overrides) {
  		var lang, langDefaults;
  		var isRTL, dirDefaults;
  
  		// converts legacy options into non-legacy ones.
  		// in the future, when this is removed, don't use `overrides` reference. make a copy.
  		overrides = massageOverrides(overrides);
  
  		lang = overrides.lang;
  		langDefaults = langOptionHash[lang];
  		if (!langDefaults) {
  			lang = Calendar.defaults.lang;
  			langDefaults = langOptionHash[lang] || {};
  		}
  
  		isRTL = firstDefined(
  			overrides.isRTL,
  			langDefaults.isRTL,
  			Calendar.defaults.isRTL
  		);
  		dirDefaults = isRTL ? Calendar.rtlDefaults : {};
  
  		this.dirDefaults = dirDefaults;
  		this.langDefaults = langDefaults;
  		this.overrides = overrides;
  		this.options = mergeOptions([ // merge defaults and overrides. lowest to highest precedence
  			Calendar.defaults, // global defaults
  			dirDefaults,
  			langDefaults,
  			overrides
  		]);
  		populateInstanceComputableOptions(this.options);
  
  		this.viewSpecCache = {}; // somewhat unrelated
  	},
  
  
  	// 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();
  			$.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.langDefaults, // 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)
  		]);
  		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] ||
  				(spec.singleUnit ? buttonText[spec.singleUnit] : null);
  		}
  
  		// highest to lowest priority
  		spec.buttonTextOverride =
  			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.langDefaults) ||
  			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.trigger('loading', null, true, this.view);
  		}
  	},
  
  
  	// Should be called when any type of async data fetching completes
  	popLoading: function() {
  		if (!(--this.loadingLevel)) {
  			this.trigger('loading', null, false, this.view);
  		}
  	},
  
  
  	// Given arguments to the select method in the API, returns a range
  	buildSelectRange: function(start, end) {
  
  		start = this.moment(start);
  		if (end) {
  			end = this.moment(end);
  		}
  		else if (start.hasTime()) {
  			end = start.clone().add(this.defaultTimedEventDuration);
  		}
  		else {
  			end = start.clone().add(this.defaultAllDayEventDuration);
  		}
  
  		return { start: start, end: end };
  	}
  
  });
  
  
  Calendar.mixin(Emitter);
  
  
  function Calendar_constructor(element, overrides) {
  	var t = this;
  
  
  	t.initOptions(overrides || {});
  	var options = this.options;
  
  	
  	// Exports
  	// -----------------------------------------------------------------------------------
  
  	t.render = render;
  	t.destroy = destroy;
  	t.refetchEvents = refetchEvents;
  	t.reportEvents = reportEvents;
  	t.reportEventChange = reportEventChange;
  	t.rerenderEvents = renderEvents; // `renderEvents` serves as a rerender. an API method
  	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;
  	t.trigger = trigger;
  
  
  
  	// Language-data Internals
  	// -----------------------------------------------------------------------------------
  	// Apply overrides to the current language's data
  
  
  	var localeData = createObject( // make a cheap copy
  		getMomentLocaleData(options.lang) // will fall back to en
  	);
  
  	if (options.monthNames) {
  		localeData._months = options.monthNames;
  	}
  	if (options.monthNamesShort) {
  		localeData._monthsShort = options.monthNamesShort;
  	}
  	if (options.dayNames) {
  		localeData._weekdays = options.dayNames;
  	}
  	if (options.dayNamesShort) {
  		localeData._weekdaysShort = options.dayNamesShort;
  	}
  	if (options.firstDay != null) {
  		var _week = createObject(localeData._week); // _week: { dow: # }
  		_week.dow = options.firstDay;
  		localeData._week = _week;
  	}
  
  	// assign a normalized value, to be used by our .week() moment extension
  	localeData._fullCalendar_weekCalc = (function(weekCalc) {
  		if (typeof weekCalc === 'function') {
  			return weekCalc;
  		}
  		else if (weekCalc === 'local') {
  			return weekCalc;
  		}
  		else if (weekCalc === 'iso' || weekCalc === 'ISO') {
  			return 'ISO';
  		}
  	})(options.weekNumberCalculation);
  
  
  
  	// Calendar-specific Date Utilities
  	// -----------------------------------------------------------------------------------
  
  
  	t.defaultAllDayEventDuration = moment.duration(options.defaultAllDayEventDuration);
  	t.defaultTimedEventDuration = moment.duration(options.defaultTimedEventDuration);
  
  
  	// Builds a moment using the settings of the current calendar: timezone and language.
  	// Accepts anything the vanilla moment() constructor accepts.
  	t.moment = function() {
  		var mom;
  
  		if (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 (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
  		}
  
  		if ('_locale' in mom) { // moment 2.8 and above
  			mom._locale = localeData;
  		}
  		else { // pre-moment-2.8
  			mom._lang = localeData;
  		}
  
  		return mom;
  	};
  
  
  	// 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 options.timezone !== 'local' && options.timezone !== 'UTC';
  	};
  
  
  	// Returns a copy of the given date in the current timezone of it is ambiguously zoned.
  	// This will also give the date an unambiguous time.
  	t.rezoneDate = function(date) {
  		return t.moment(date.toArray());
  	};
  
  
  	// Returns a moment for the current date, as defined by the client's computer,
  	// or overridden by the `now` option.
  	t.getNow = function() {
  		var now = options.now;
  		if (typeof now === 'function') {
  			now = now();
  		}
  		return t.moment(now);
  	};
  
  
  	// 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 swhat its fallback end date should be.
  	t.getDefaultEventEnd = function(allDay, start) { // TODO: rename to computeDefaultEventEnd
  		var end = start.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 || duration.lang).call(duration, options.lang) // works moment-pre-2.8
  			.humanize();
  	};
  
  
  	
  	// Imports
  	// -----------------------------------------------------------------------------------
  
  
  	EventManager.call(t, options);
  	var isFetchNeeded = t.isFetchNeeded;
  	var fetchEvents = t.fetchEvents;
  
  
  
  	// Locals
  	// -----------------------------------------------------------------------------------
  
  
  	var _element = element[0];
  	var header;
  	var headerElement;
  	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;
  	var events = [];
  	
  	
  	
  	// Main Rendering
  	// -----------------------------------------------------------------------------------
  
  
  	if (options.defaultDate != null) {
  		date = t.moment(options.defaultDate);
  	}
  	else {
  		date = t.getNow();
  	}
  	
  	
  	function render() {
  		if (!content) {
  			initialRender();
  		}
  		else if (elementVisible()) {
  			// mainly for the public API
  			calcSize();
  			renderView();
  		}
  	}
  	
  	
  	function initialRender() {
  		tm = options.theme ? 'ui' : 'fc';
  		element.addClass('fc');
  
  		if (options.isRTL) {
  			element.addClass('fc-rtl');
  		}
  		else {
  			element.addClass('fc-ltr');
  		}
  
  		if (options.theme) {
  			element.addClass('ui-widget');
  		}
  		else {
  			element.addClass('fc-unthemed');
  		}
  
  		content = $("<div class='fc-view-container'/>").prependTo(element);
  
  		header = t.header = new Header(t, options);
  		headerElement = header.render();
  		if (headerElement) {
  			element.prepend(headerElement);
  		}
  
  		renderView(options.defaultView);
  
  		if (options.handleWindowResize) {
  			windowResizeProxy = debounce(windowResize, 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.
  		}
  
  		header.removeElement();
  		content.remove();
  		element.removeClass('fc fc-ltr fc-rtl fc-unthemed ui-widget');
  
  		if (windowResizeProxy) {
  			$(window).unbind('resize', windowResizeProxy);
  		}
  	}
  	
  	
  	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.
  	function renderView(viewType) {
  		ignoreWindowResize++;
  
  		// if viewType is changing, remove the old view's rendering
  		if (currentView && viewType && currentView.type !== viewType) {
  			header.deactivateButton(currentView.type);
  			freezeContentHeight(); // prevent a scroll jump when view element is removed
  			currentView.removeElement();
  			currentView = t.view = null;
  		}
  
  		// 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)
  			);
  			header.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.displaying ||
  				!date.isWithin(currentView.intervalStart, currentView.intervalEnd) // implicit date window change
  			) {
  				if (elementVisible()) {
  
  					freezeContentHeight();
  					currentView.display(date);
  					unfreezeContentHeight(); // immediately unfreeze regardless of whether display is async
  
  					// need to do this after View::render, so dates are calculated
  					updateHeaderTitle();
  					updateTodayButton();
  
  					getAndRenderEvents();
  				}
  			}
  		}
  
  		unfreezeContentHeight(); // undo any lone freezeContentHeight calls
  		ignoreWindowResize--;
  	}
  
  	
  
  	// Resizing
  	// -----------------------------------------------------------------------------------
  
  
  	t.getSuggestedViewHeight = function() {
  		if (suggestedViewHeight === undefined) {
  			calcSize();
  		}
  		return suggestedViewHeight;
  	};
  
  
  	t.isHeightAuto = function() {
  		return options.contentHeight === 'auto' || 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
  		if (typeof options.contentHeight === 'number') { // exists and not 'auto'
  			suggestedViewHeight = options.contentHeight;
  		}
  		else if (typeof options.height === 'number') { // exists and not 'auto'
  			suggestedViewHeight = options.height - (headerElement ? headerElement.outerHeight(true) : 0);
  		}
  		else {
  			suggestedViewHeight = Math.round(content.width() / Math.max(options.aspectRatio, .5));
  		}
  	}
  	
  	
  	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.trigger('windowResize', _element);
  			}
  		}
  	}
  	
  	
  	
  	/* Event Fetching/Rendering
  	-----------------------------------------------------------------------------*/
  	// TODO: going forward, most of this stuff should be directly handled by the view
  
  
  	function refetchEvents() { // can be called as an API method
  		destroyEvents(); // so that events are cleared before user starts waiting for AJAX
  		fetchAndRenderEvents();
  	}
  
  
  	function renderEvents() { // destroys old events if previously rendered
  		if (elementVisible()) {
  			freezeContentHeight();
  			currentView.displayEvents(events);
  			unfreezeContentHeight();
  		}
  	}
  
  
  	function destroyEvents() {
  		freezeContentHeight();
  		currentView.clearEvents();
  		unfreezeContentHeight();
  	}
  	
  
  	function getAndRenderEvents() {
  		if (!options.lazyFetching || isFetchNeeded(currentView.start, currentView.end)) {
  			fetchAndRenderEvents();
  		}
  		else {
  			renderEvents();
  		}
  	}
  
  
  	function fetchAndRenderEvents() {
  		fetchEvents(currentView.start, currentView.end);
  			// ... will call reportEvents
  			// ... which will call renderEvents
  	}
  
  	
  	// called when event data arrives
  	function reportEvents(_events) {
  		events = _events;
  		renderEvents();
  	}
  
  
  	// called when a single event's data has been changed
  	function reportEventChange() {
  		renderEvents();
  	}
  
  
  
  	/* Header Updating
  	-----------------------------------------------------------------------------*/
  
  
  	function updateHeaderTitle() {
  		header.updateTitle(currentView.title);
  	}
  
  
  	function updateTodayButton() {
  		var now = t.getNow();
  		if (now.isWithin(currentView.intervalStart, currentView.intervalEnd)) {
  			header.disableButton('today');
  		}
  		else {
  			header.enableButton('today');
  		}
  	}
  	
  
  
  	/* Selection
  	-----------------------------------------------------------------------------*/
  	
  
  	function select(start, end) {
  		currentView.select(
  			t.buildSelectRange.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(dateInput) {
  		date = t.moment(dateInput);
  		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;
  		renderView(spec ? spec.type : null);
  	}
  	
  	
  	function getDate() {
  		return date.clone();
  	}
  
  
  
  	/* Height "Freezing"
  	-----------------------------------------------------------------------------*/
  	// TODO: move this into the view
  
  
  	function freezeContentHeight() {
  		content.css({
  			width: '100%',
  			height: content.height(),
  			overflow: 'hidden'
  		});
  	}
  
  
  	function unfreezeContentHeight() {
  		content.css({
  			width: '',
  			height: '',
  			overflow: ''
  		});
  	}
  	
  	
  	
  	/* Misc
  	-----------------------------------------------------------------------------*/
  	
  
  	function getCalendar() {
  		return t;
  	}
  
  	
  	function getView() {
  		return currentView;
  	}
  	
  	
  	function option(name, value) {
  		if (value === undefined) {
  			return options[name];
  		}
  		if (name == 'height' || name == 'contentHeight' || name == 'aspectRatio') {
  			options[name] = value;
  			updateSize(true); // true = allow recalculation of height
  		}
  	}
  	
  	
  	function trigger(name, thisObj) { // overrides the Emitter's trigger method :(
  		var args = Array.prototype.slice.call(arguments, 2);
  
  		thisObj = thisObj || _element;
  		this.triggerWith(name, thisObj, args); // Emitter's method
  
  		if (options[name]) {
  			return options[name].apply(thisObj, args);
  		}
  	}
  
  	t.initialize();
  }
  
  ;;
  
  Calendar.defaults = {
  
  	titleRangeSeparator: ' \u2014 ', // emphasized dash
  	monthYearFormat: 'MMMM YYYY', // required for en. other languages 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,
  
  	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'
  	},
  	
  	// 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,
  	
  	dropAccept: '*',
  
  	eventOrder: 'title',
  
  	eventLimit: false,
  	eventLimitText: 'more',
  	eventLimitClick: 'popover',
  	dayPopoverFormat: 'LL',
  	
  	handleWindowResize: true,
  	windowResizeDelay: 200 // milliseconds before an updateSize happens
  	
  };
  
  
  Calendar.englishDefaults = { // used by lang.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 langOptionHash = fc.langs = {}; // initialize and expose
  
  
  // TODO: document the structure and ordering of a FullCalendar lang file
  // TODO: rename everything "lang" to "locale", like what the moment project did
  
  
  // Initialize jQuery UI datepicker translations while using some of the translations
  // Will set this as the default language for datepicker.
  fc.datepickerLang = function(langCode, dpLangCode, dpOptions) {
  
  	// get the FullCalendar internal option hash for this language. create if necessary
  	var fcOptions = langOptionHash[langCode] || (langOptionHash[langCode] = {});
  
  	// 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 language data.
  		// FullCalendar and MomentJS use language codes like "pt-br" but Datepicker
  		// does it like "pt-BR" or if it doesn't have the language, maybe just "pt".
  		// Make an alias so the language can be referenced either way.
  		$.datepicker.regional[dpLangCode] =
  			$.datepicker.regional[langCode] = // alias
  				dpOptions;
  
  		// Alias 'en' to the default language 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 language as the global default.
  fc.lang = function(langCode, newFcOptions) {
  	var fcOptions;
  	var momOptions;
  
  	// get the FullCalendar internal option hash for this language. create if necessary
  	fcOptions = langOptionHash[langCode] || (langOptionHash[langCode] = {});
  
  	// provided new options for this language? merge them in
  	if (newFcOptions) {
  		fcOptions = langOptionHash[langCode] = mergeOptions([ fcOptions, newFcOptions ]);
  	}
  
  	// compute language 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(langCode); // will fall back to en
  	$.each(momComputableOptions, function(name, func) {
  		if (fcOptions[name] == null) {
  			fcOptions[name] = func(momOptions, fcOptions);
  		}
  	});
  
  	// set it as the default language for FullCalendar
  	Calendar.defaults.lang = langCode;
  };
  
  
  // NOTE: can't guarantee any of these computations will run because not every language 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)$/, '($1)') // like above, but for foreign langs
  			.replace(/\s*a$/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)$/, '($1)') // like above, but for foreign langs
  			.replace(/\s*a$/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)$/, '') // like above, but for foreign langs
  			.replace(/\s*a$/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)
  var instanceComputableOptions = { // TODO: best place for this? related to lang?
  
  	// 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.
  // Works with moment-pre-2.8
  function getMomentLocaleData(langCode) {
  	var func = moment.localeData || moment.langData;
  	return func.call(moment, langCode) ||
  		func.call(moment, 'en'); // the newer localData could return null, so fall back to en
  }
  
  
  // Initialize English by forcing computation of moment-derived options.
  // Also, sets it as the default.
  fc.lang('en', Calendar.englishDefaults);
  
  ;;
  
  /* Top toolbar area with buttons and title
  ----------------------------------------------------------------------------------------------------------------------*/
  // TODO: rename all header-related things to "toolbar"
  
  function Header(calendar, options) {
  	var t = this;
  	
  	// exports
  	t.render = render;
  	t.removeElement = removeElement;
  	t.updateTitle = updateTitle;
  	t.activateButton = activateButton;
  	t.deactivateButton = deactivateButton;
  	t.disableButton = disableButton;
  	t.enableButton = enableButton;
  	t.getViewsWithButtons = getViewsWithButtons;
  	
  	// locals
  	var el = $();
  	var viewsWithButtons = [];
  	var tm;
  
  
  	function render() {
  		var sections = options.header;
  
  		tm = options.theme ? 'ui' : 'fc';
  
  		if (sections) {
  			el = $("<div class='fc-toolbar'/>")
  				.append(renderSection('left'))
  				.append(renderSection('right'))
  				.append(renderSection('center'))
  				.append('<div class="fc-clear"/>');
  
  			return el;
  		}
  	}
  	
  	
  	function removeElement() {
  		el.remove();
  		el = $();
  	}
  	
  	
  	function renderSection(position) {
  		var sectionEl = $('<div class="fc-' + position + '"/>');
  		var buttonStr = options.header[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($('<h4>&nbsp;</h4>')); // 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 = options.buttonText[buttonName]; // everything else is considered default
  						}
  
  						if (buttonClick) {
  
  							themeIcon =
  								customButtonProps ?
  									customButtonProps.themeIcon :
  									options.themeButtonIcons[buttonName];
  
  							normalIcon =
  								customButtonProps ?
  									customButtonProps.icon :
  									options.buttonIcons[buttonName];
  
  							if (overrideText) {
  								innerHtml = htmlEscape(overrideText);
  							}
  							else if (themeIcon && options.theme) {
  								innerHtml = "<span class='ui-icon ui-icon-" + themeIcon + "'></span>";
  							}
  							else if (normalIcon && !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) {
  		el.find('h4').text(text);
  	}
  	
  	
  	function activateButton(buttonName) {
  		el.find('.fc-' + buttonName + '-button')
  			.addClass(tm + '-state-active');
  	}
  	
  	
  	function deactivateButton(buttonName) {
  		el.find('.fc-' + buttonName + '-button')
  			.removeClass(tm + '-state-active');
  	}
  	
  	
  	function disableButton(buttonName) {
  		el.find('.fc-' + buttonName + '-button')
  			.attr('disabled', 'disabled')
  			.addClass(tm + '-state-disabled');
  	}
  	
  	
  	function enableButton(buttonName) {
  		el.find('.fc-' + buttonName + '-button')
  			.removeAttr('disabled')
  			.removeClass(tm + '-state-disabled');
  	}
  
  
  	function getViewsWithButtons() {
  		return viewsWithButtons;
  	}
  
  }
  
  ;;
  
  fc.sourceNormalizers = [];
  fc.sourceFetchers = [];
  
  var ajaxDefaults = {
  	dataType: 'json',
  	cache: false
  };
  
  var eventGUID = 1;
  
  
  function EventManager(options) { // assumed to be a calendar
  	var t = this;
  	
  	
  	// exports
  	t.isFetchNeeded = isFetchNeeded;
  	t.fetchEvents = fetchEvents;
  	t.addEventSource = addEventSource;
  	t.removeEventSource = removeEventSource;
  	t.updateEvent = updateEvent;
  	t.renderEvent = renderEvent;
  	t.removeEvents = removeEvents;
  	t.clientEvents = clientEvents;
  	t.mutateEvent = mutateEvent;
  	t.normalizeEventRange = normalizeEventRange;
  	t.normalizeEventRangeTimes = normalizeEventRangeTimes;
  	t.ensureVisibleEventRange = ensureVisibleEventRange;
  	
  	
  	// imports
  	var reportEvents = t.reportEvents;
  	
  	
  	// locals
  	var stickySource = { events: [] };
  	var sources = [ stickySource ];
  	var rangeStart, rangeEnd;
  	var currentFetchID = 0;
  	var pendingSourceCnt = 0;
  	var cache = []; // holds events that have already been expanded
  
  
  	$.each(
  		(options.events ? [ options.events ] : []).concat(options.eventSources || []),
  		function(i, sourceInput) {
  			var source = buildEventSource(sourceInput);
  			if (source) {
  				sources.push(source);
  			}
  		}
  	);
  	
  	
  	
  	/* Fetching
  	-----------------------------------------------------------------------------*/
  	
  	
  	function isFetchNeeded(start, end) {
  		return !rangeStart || // nothing has been fetched yet?
  			// or, a part of the new range is outside of the old range? (after normalizing)
  			start.clone().stripZone() < rangeStart.clone().stripZone() ||
  			end.clone().stripZone() > rangeEnd.clone().stripZone();
  	}
  	
  	
  	function fetchEvents(start, end) {
  		rangeStart = start;
  		rangeEnd = end;
  		cache = [];
  		var fetchID = ++currentFetchID;
  		var len = sources.length;
  		pendingSourceCnt = len;
  		for (var i=0; i<len; i++) {
  			fetchEventSource(sources[i], fetchID);
  		}
  	}
  	
  	
  	function fetchEventSource(source, fetchID) {
  		_fetchEventSource(source, function(eventInputs) {
  			var isArraySource = $.isArray(source.events);
  			var i, eventInput;
  			var abstractEvent;
  
  			if (fetchID == currentFetchID) {
  
  				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(
  								cache,
  								expandEvent(abstractEvent) // add individual expanded events to the cache
  							);
  						}
  					}
  				}
  
  				pendingSourceCnt--;
  				if (!pendingSourceCnt) {
  					reportEvents(cache);
  				}
  			}
  		});
  	}
  	
  	
  	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(),
  				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 ($.isFunction(events)) {
  				t.pushLoading();
  				events.call(
  					t, // this, the Calendar object
  					rangeStart.clone(),
  					rangeEnd.clone(),
  					options.timezone,
  					function(events) {
  						callback(events);
  						t.popLoading();
  					}
  				);
  			}
  			else if ($.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, options.startParam);
  				var endParam = firstDefined(source.endParam, options.endParam);
  				var timezoneParam = firstDefined(source.timezoneParam, options.timezoneParam);
  
  				if (startParam) {
  					data[startParam] = rangeStart.format();
  				}
  				if (endParam) {
  					data[endParam] = rangeEnd.format();
  				}
  				if (options.timezone && options.timezone != 'local') {
  					data[timezoneParam] = 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);
  			pendingSourceCnt++;
  			fetchEventSource(source, currentFetchID); // will eventually call reportEvents
  		}
  	}
  
  
  	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(source) {
  		sources = $.grep(sources, function(src) {
  			return !isSourcesEqual(src, source);
  		});
  		// remove all client events from that source
  		cache = $.grep(cache, function(e) {
  			return !isSourcesEqual(e.source, source);
  		});
  		reportEvents(cache);
  	}
  
  
  	function isSourcesEqual(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
  	}
  	
  	
  	
  	/* Manipulation
  	-----------------------------------------------------------------------------*/
  
  
  	// Only ever called from the externally-facing API
  	function updateEvent(event) {
  
  		// 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
  		reportEvents(cache); // 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) {
  		var abstractEvent = buildEventFromInput(eventInput);
  		var events;
  		var i, event;
  
  		if (abstractEvent) { // not false (a valid input)
  			events = expandEvent(abstractEvent);
  
  			for (i = 0; i < events.length; i++) {
  				event = events[i];
  
  				if (!event.source) {
  					if (stick) {
  						stickySource.events.push(event);
  						event.source = stickySource;
  					}
  					cache.push(event);
  				}
  			}
  
  			reportEvents(cache);
  
  			return events;
  		}
  
  		return [];
  	}
  	
  	
  	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);
  			}
  		}
  
  		reportEvents(cache);
  	}
  	
  	
  	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
  	}
  	
  	
  	
  	/* 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 (options.eventDataTransform) {
  			input = 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,
  					options.allDayDefault
  				);
  				// still undefined? normalizeEventRange will calculate it
  			}
  
  			assignDatesToEvent(start, end, allDay, out);
  		}
  
  		return out;
  	}
  
  
  	// 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;
  		normalizeEventRange(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 normalizeEventRange(props) {
  
  		normalizeEventRangeTimes(props);
  
  		if (props.end && !props.end.isAfter(props.start)) {
  			props.end = null;
  		}
  
  		if (!props.end) {
  			if (options.forceEventDuration) {
  				props.end = t.getDefaultEventEnd(props.allDay, props.start);
  			}
  			else {
  				props.end = null;
  			}
  		}
  	}
  
  
  	// Ensures the allDay property exists and the timeliness of the start/end dates are consistent
  	function normalizeEventRangeTimes(range) {
  		if (range.allDay == null) {
  			range.allDay = !(range.start.hasTime() || (range.end && range.end.hasTime()));
  		}
  
  		if (range.allDay) {
  			range.start.stripTime();
  			if (range.end) {
  				// TODO: consider nextDayThreshold here? If so, will require a lot of testing and adjustment
  				range.end.stripTime();
  			}
  		}
  		else {
  			if (!range.start.hasTime()) {
  				range.start = t.rezoneDate(range.start); // will assign a 00:00 time
  			}
  			if (range.end && !range.end.hasTime()) {
  				range.end = t.rezoneDate(range.end); // will assign a 00:00 time
  			}
  		}
  	}
  
  
  	// If `range` is a proper range with a start and end, returns the original object.
  	// If missing an end, computes a new range with an end, computing it as if it were an event.
  	// TODO: make this a part of the event -> eventRange system
  	function ensureVisibleEventRange(range) {
  		var allDay;
  
  		if (!range.end) {
  
  			allDay = range.allDay; // range might be more event-ish than we think
  			if (allDay == null) {
  				allDay = !range.start.hasTime();
  			}
  
  			range = $.extend({}, range); // make a copy, copying over other misc properties
  			range.end = t.getDefaultEventEnd(allDay, range.start);
  		}
  		return range;
  	}
  
  
  	// 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;
  	}
  
  
  
  	/* 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;
  		}
  		normalizeEventRange(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
  		};
  		normalizeEventRange(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
  			};
  			normalizeEventRange(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]();
  			}
  		};
  	}
  
  
  	/* Business Hours
  	-----------------------------------------------------------------------------------------*/
  
  	t.getBusinessHoursEvents = getBusinessHoursEvents;
  
  
  	// Returns an array of events as to when the business hours occur in the given view.
  	// Abuse of our event system :(
  	function getBusinessHoursEvents(wholeDay) {
  		var optionVal = options.businessHours;
  		var defaultVal = {
  			className: 'fc-nonbusiness',
  			start: '09:00',
  			end: '17:00',
  			dow: [ 1, 2, 3, 4, 5 ], // monday - friday
  			rendering: 'inverse-background'
  		};
  		var view = t.getView();
  		var eventInput;
  
  		if (optionVal) { // `true` (which means "use the defaults") or an override object
  			eventInput = $.extend(
  				{}, // copy to a new object in either case
  				defaultVal,
  				typeof optionVal === 'object' ? optionVal : {} // override the defaults
  			);
  		}
  
  		if (eventInput) {
  
  			// if a whole-day series is requested, clear the start/end times
  			if (wholeDay) {
  				eventInput.start = null;
  				eventInput.end = null;
  			}
  
  			return expandEvent(
  				buildEventFromInput(eventInput),
  				view.start,
  				view.end
  			);
  		}
  
  		return [];
  	}
  
  
  	/* Overlapping / Constraining
  	-----------------------------------------------------------------------------------------*/
  
  	t.isEventRangeAllowed = isEventRangeAllowed;
  	t.isSelectionRangeAllowed = isSelectionRangeAllowed;
  	t.isExternalDropRangeAllowed = isExternalDropRangeAllowed;
  
  
  	function isEventRangeAllowed(range, event) {
  		var source = event.source || {};
  		var constraint = firstDefined(
  			event.constraint,
  			source.constraint,
  			options.eventConstraint
  		);
  		var overlap = firstDefined(
  			event.overlap,
  			source.overlap,
  			options.eventOverlap
  		);
  
  		range = ensureVisibleEventRange(range); // ensure a proper range with an end for isRangeAllowed
  
  		return isRangeAllowed(range, constraint, overlap, event);
  	}
  
  
  	function isSelectionRangeAllowed(range) {
  		return isRangeAllowed(range, options.selectConstraint, options.selectOverlap);
  	}
  
  
  	// when `eventProps` is defined, consider this an event.
  	// `eventProps` can contain misc non-date-related info about the event.
  	function isExternalDropRangeAllowed(range, eventProps) {
  		var eventInput;
  		var event;
  
  		// note: very similar logic is in View's reportExternalDrop
  		if (eventProps) {
  			eventInput = $.extend({}, eventProps, range);
  			event = expandEvent(buildEventFromInput(eventInput))[0];
  		}
  
  		if (event) {
  			return isEventRangeAllowed(range, event);
  		}
  		else { // treat it as a selection
  
  			range = ensureVisibleEventRange(range); // ensure a proper range with an end for isSelectionRangeAllowed
  
  			return isSelectionRangeAllowed(range);
  		}
  	}
  
  
  	// Returns true if the given range (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.
  	function isRangeAllowed(range, constraint, overlap, event) {
  		var constraintEvents;
  		var anyContainment;
  		var peerEvents;
  		var i, peerEvent;
  		var peerOverlap;
  
  		// normalize. fyi, we're normalizing in too many places :(
  		range = $.extend({}, range); // copy all properties in case there are misc non-date properties
  		range.start = range.start.clone().stripZone();
  		range.end = range.end.clone().stripZone();
  
  		// 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 = constraintToEvents(constraint);
  
  			anyContainment = false;
  			for (i = 0; i < constraintEvents.length; i++) {
  				if (eventContainsRange(constraintEvents[i], range)) {
  					anyContainment = true;
  					break;
  				}
  			}
  
  			if (!anyContainment) {
  				return false;
  			}
  		}
  
  		peerEvents = t.getPeerEvents(event, range);
  
  		for (i = 0; i < peerEvents.length; i++)  {
  			peerEvent = peerEvents[i];
  
  			// there needs to be an actual intersection before disallowing anything
  			if (eventIntersectsRange(peerEvent, range)) {
  
  				// 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)
  	function constraintToEvents(constraintInput) {
  
  		if (constraintInput === 'businessHours') {
  			return getBusinessHoursEvents();
  		}
  
  		if (typeof constraintInput === 'object') {
  			return expandEvent(buildEventFromInput(constraintInput));
  		}
  
  		return clientEvents(constraintInput); // probably an ID
  	}
  
  
  	// Does the event's date range fully contain the given range?
  	// start/end already assumed to have stripped zones :(
  	function eventContainsRange(event, range) {
  		var eventStart = event.start.clone().stripZone();
  		var eventEnd = t.getEventEnd(event).stripZone();
  
  		return range.start >= eventStart && range.end <= eventEnd;
  	}
  
  
  	// Does the event's date range intersect with the given range?
  	// start/end already assumed to have stripped zones :(
  	function eventIntersectsRange(event, range) {
  		var eventStart = event.start.clone().stripZone();
  		var eventEnd = t.getEventEnd(event).stripZone();
  
  		return range.start < eventEnd && range.end > eventStart;
  	}
  
  
  	t.getEventCache = function() {
  		return cache;
  	};
  
  }
  
  
  // Returns a list of events that the given event should be compared against when being considered for a move to
  // the specified range. Attached to the Calendar's prototype because EventManager is a mixin for a Calendar.
  Calendar.prototype.getPeerEvents = function(event, range) {
  	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;
  }
  
  ;;
  
  /* 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 = View.extend({
  
  	dayGrid: null, // the main subcomponent that does most of the heavy lifting
  
  	dayNumbersVisible: false, // display day numbers on each day cell?
  	weekNumbersVisible: false, // display week numbers along the side?
  
  	weekNumberWidth: null, // width of all the week-number cells running down the side
  
  	headRowEl: null, // the fake row element of the day-of-week header
  
  
  	initialize: function() {
  		this.dayGrid = new DayGrid(this);
  		this.coordMap = this.dayGrid.coordMap; // the view's date-to-cell mapping is identical to the subcomponent's
  	},
  
  
  	// 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
  		this.weekNumbersVisible = this.opt('weekNumbers');
  		this.dayGrid.numbersVisible = this.dayNumbersVisible || this.weekNumbersVisible;
  
  		this.el.addClass('fc-basic-view').html(this.renderHtml());
  
  		this.headRowEl = this.el.find('thead .fc-row');
  
  		this.scrollerEl = this.el.find('.fc-day-grid-container');
  		this.dayGrid.coordMap.containerEl = this.scrollerEl; // constrain clicks/etc to the dimensions of the scroller
  
  		this.dayGrid.setElement(this.el.find('.fc-day-grid'));
  		this.dayGrid.renderDates(this.hasRigidRows());
  	},
  
  
  	// 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();
  	},
  
  
  	renderBusinessHours: function() {
  		this.dayGrid.renderBusinessHours();
  	},
  
  
  	// Builds the HTML skeleton for the view.
  	// The day-grid component will render inside of a container defined by this HTML.
  	renderHtml: function() {
  		return '' +
  			'<table>' +
  				'<thead class="fc-head">' +
  					'<tr>' +
  						'<td class="' + this.widgetHeaderClass + '">' +
  							this.dayGrid.headHtml() + // render the day-of-week headers
  						'</td>' +
  					'</tr>' +
  				'</thead>' +
  				'<tbody class="fc-body">' +
  					'<tr>' +
  						'<td class="' + this.widgetContentClass + '">' +
  							'<div class="fc-day-grid-container">' +
  								'<div class="fc-day-grid"/>' +
  							'</div>' +
  						'</td>' +
  					'</tr>' +
  				'</tbody>' +
  			'</table>';
  	},
  
  
  	// Generates the HTML that will go before the day-of week header cells.
  	// Queried by the DayGrid subcomponent when generating rows. Ordering depends on isRTL.
  	headIntroHtml: function() {
  		if (this.weekNumbersVisible) {
  			return '' +
  				'<th class="fc-week-number ' + this.widgetHeaderClass + '" ' + this.weekNumberStyleAttr() + '>' +
  					'<span>' + // needed for matchCellWidths
  						htmlEscape(this.opt('weekNumberTitle')) +
  					'</span>' +
  				'</th>';
  		}
  	},
  
  
  	// Generates the HTML that will go before content-skeleton cells that display the day/week numbers.
  	// Queried by the DayGrid subcomponent. Ordering depends on isRTL.
  	numberIntroHtml: function(row) {
  		if (this.weekNumbersVisible) {
  			return '' +
  				'<td class="fc-week-number" ' + this.weekNumberStyleAttr() + '>' +
  					'<span>' + // needed for matchCellWidths
  						this.dayGrid.getCell(row, 0).start.format('w') +
  					'</span>' +
  				'</td>';
  		}
  	},
  
  
  	// Generates the HTML that goes before the day bg cells for each day-row.
  	// Queried by the DayGrid subcomponent. Ordering depends on isRTL.
  	dayIntroHtml: function() {
  		if (this.weekNumbersVisible) {
  			return '<td class="fc-week-number ' + this.widgetContentClass + '" ' +
  				this.weekNumberStyleAttr() + '></td>';
  		}
  	},
  
  
  	// Generates the HTML that goes before every other type of row generated by DayGrid. Ordering depends on isRTL.
  	// Affects helper-skeleton and highlight-skeleton rows.
  	introHtml: function() {
  		if (this.weekNumbersVisible) {
  			return '<td class="fc-week-number" ' + this.weekNumberStyleAttr() + '></td>';
  		}
  	},
  
  
  	// 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.
  	numberCellHtml: function(cell) {
  		var date = cell.start;
  		var classes;
  
  		if (!this.dayNumbersVisible) { // if there are week numbers but not day numbers
  			return '<td/>'; //  will create an empty space above events :(
  		}
  
  		classes = this.dayGrid.getDayClasses(date);
  		classes.unshift('fc-day-number');
  
  		return '' +
  			'<td class="' + classes.join(' ') + '" data-date="' + date.format() + '">' +
  				date.date() +
  			'</td>';
  	},
  
  
  	// 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.weekNumbersVisible) {
  			// 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;
  
  		// reset all heights to be natural
  		unsetScroller(this.scrollerEl);
  		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
  		}
  
  		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 && setPotentialScroller(this.scrollerEl, scrollerHeight)) { // using scrollbars?
  
  			compensateScroll(this.headRowEl, getScrollbarWidths(this.scrollerEl));
  
  			// doing the scrollbar compensation might have created text overflow which created more height. redo
  			scrollerHeight = this.computeScrollerHeight(totalHeight);
  			this.scrollerEl.height(scrollerHeight);
  		}
  	},
  
  
  	// 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
  		}
  	},
  
  
  	/* 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) a renderEvents() call always happens after this, which will eventually call updateHeight()
  		// B) in IE8, this causes a flash whenever events are rerendered
  	},
  
  
  	/* 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(range) {
  		this.dayGrid.renderSelection(range);
  	},
  
  
  	// Unrenders a visual indications of a selection
  	unrenderSelection: function() {
  		this.dayGrid.unrenderSelection();
  	}
  
  });
  
  ;;
  
  /* A month view with day cells running in rows (one-per-week) and columns
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var 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) {
  
  		isAuto = isAuto || this.opt('weekMode') === 'variable'; // LEGACY: weekMode is deprecated
  
  		// 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() {
  		var weekMode = this.opt('weekMode'); // LEGACY: weekMode is deprecated
  		if (weekMode) {
  			return weekMode === 'fixed'; // if any other type of weekMode, assume NOT fixed
  		}
  
  		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 = View.extend({
  
  	timeGrid: null, // the main time-grid subcomponent of this view
  	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
  
  	noScrollRowEls: null, // set of fake row elements that must compensate when scrollerEl has scrollbars
  
  	// when the time-grid isn't tall enough to occupy the given height, we render an <hr> underneath
  	bottomRuleEl: null,
  	bottomRuleHeight: null,
  
  
  	initialize: function() {
  		this.timeGrid = new TimeGrid(this);
  
  		if (this.opt('allDaySlot')) { // should we display the "all-day" area?
  			this.dayGrid = new DayGrid(this); // the all-day subcomponent of this view
  
  			// the coordinate grid will be a combination of both subcomponents' grids
  			this.coordMap = new ComboCoordMap([
  				this.dayGrid.coordMap,
  				this.timeGrid.coordMap
  			]);
  		}
  		else {
  			this.coordMap = this.timeGrid.coordMap;
  		}
  	},
  
  
  	/* 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.renderHtml());
  
  		// the element that wraps the time-grid that will probably scroll
  		this.scrollerEl = this.el.find('.fc-time-grid-container');
  		this.timeGrid.coordMap.containerEl = this.scrollerEl; // don't accept clicks/etc outside of this
  
  		this.timeGrid.setElement(this.el.find('.fc-time-grid'));
  		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
  	},
  
  
  	// 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();
  		}
  	},
  
  
  	renderBusinessHours: function() {
  		this.timeGrid.renderBusinessHours();
  
  		if (this.dayGrid) {
  			this.dayGrid.renderBusinessHours();
  		}
  	},
  
  
  	// Builds the HTML skeleton for the view.
  	// The day-grid and time-grid components will render inside containers defined by this HTML.
  	renderHtml: function() {
  		return '' +
  			'<table>' +
  				'<thead class="fc-head">' +
  					'<tr>' +
  						'<td class="' + this.widgetHeaderClass + '">' +
  							this.timeGrid.headHtml() + // render the day-of-week headers
  						'</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 + '"/>' :
  								''
  								) +
  							'<div class="fc-time-grid-container">' +
  								'<div class="fc-time-grid"/>' +
  							'</div>' +
  						'</td>' +
  					'</tr>' +
  				'</tbody>' +
  			'</table>';
  	},
  
  
  	// Generates the HTML that will go before the day-of week header cells.
  	// Queried by the TimeGrid subcomponent when generating rows. Ordering depends on isRTL.
  	headIntroHtml: function() {
  		var date;
  		var weekText;
  
  		if (this.opt('weekNumbers')) {
  			date = this.timeGrid.getCell(0).start;
  			weekText = date.format(this.opt('smallWeekFormat'));
  
  			return '' +
  				'<th class="fc-axis fc-week-number ' + this.widgetHeaderClass + '" ' + this.axisStyleAttr() + '>' +
  					'<span>' + // needed for matchCellWidths
  						htmlEscape(weekText) +
  					'</span>' +
  				'</th>';
  		}
  		else {
  			return '<th class="fc-axis ' + this.widgetHeaderClass + '" ' + this.axisStyleAttr() + '></th>';
  		}
  	},
  
  
  	// Generates the HTML that goes before the all-day cells.
  	// Queried by the DayGrid subcomponent when generating rows. Ordering depends on isRTL.
  	dayIntroHtml: function() {
  		return '' +
  			'<td class="fc-axis ' + this.widgetContentClass + '" ' + this.axisStyleAttr() + '>' +
  				'<span>' + // needed for matchCellWidths
  					(this.opt('allDayHtml') || htmlEscape(this.opt('allDayText'))) +
  				'</span>' +
  			'</td>';
  	},
  
  
  	// Generates the HTML that goes before the bg of the TimeGrid slot area. Long vertical column.
  	slotBgIntroHtml: function() {
  		return '<td class="fc-axis ' + this.widgetContentClass + '" ' + this.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.
  	// Queried by the TimeGrid and DayGrid subcomponents when generating rows. Ordering depends on isRTL.
  	introHtml: function() {
  		return '<td class="fc-axis" ' + this.axisStyleAttr() + '></td>';
  	},
  
  
  	// 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 '';
  	},
  
  
  	/* 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;
  
  		if (this.bottomRuleHeight === null) {
  			// calculate the height of the rule the very first time
  			this.bottomRuleHeight = this.bottomRuleEl.outerHeight();
  		}
  		this.bottomRuleEl.hide(); // .show() will be called later if this <hr> is necessary
  
  		// reset all dimensions back to the original state
  		this.scrollerEl.css('overflow', '');
  		unsetScroller(this.scrollerEl);
  		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, or let the contents be natural height?
  
  			scrollerHeight = this.computeScrollerHeight(totalHeight);
  			if (setPotentialScroller(this.scrollerEl, scrollerHeight)) { // using scrollbars?
  
  				// make the all-day and header rows lines up
  				compensateScroll(this.noScrollRowEls, getScrollbarWidths(this.scrollerEl));
  
  				// 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.scrollerEl.height(scrollerHeight);
  			}
  			else { // no scrollbars
  				// still, force a height and display the bottom rule (marks the end of day)
  				this.scrollerEl.height(scrollerHeight).css('overflow', 'hidden'); // in case <hr> goes outside
  				this.bottomRuleEl.show();
  			}
  		}
  	},
  
  
  	// 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;
  	},
  
  
  	/* 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) a renderEvents() call always happens after this, which will eventually call updateHeight()
  		// B) in IE8, this causes a flash whenever events are rerendered
  	},
  
  
  	/* 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(range) {
  		if (range.start.hasTime() || range.end.hasTime()) {
  			this.timeGrid.renderSelection(range);
  		}
  		else if (this.dayGrid) {
  			this.dayGrid.renderSelection(range);
  		}
  	},
  
  
  	// Unrenders a visual indications of a selection
  	unrenderSelection: function() {
  		this.timeGrid.unrenderSelection();
  		if (this.dayGrid) {
  			this.dayGrid.unrenderSelection();
  		}
  	}
  
  });
  
  ;;
  
  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,
  		allDayText: 'all-day',
  		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 }
  };
  ;;
  
  return fc; // export for Node/CommonJS
  });