text: /*!
   * FullCalendar v3.6.1
   * Docs & License: https://fullcalendar.io/
   * (c) 2017 Adam Shaw
   */
  
  (function(factory) {
  	if (typeof define === 'function' && define.amd) {
  		define([ 'jquery', 'moment' ], factory);
  	}
  	else if (typeof exports === 'object') { // Node/CommonJS
  		module.exports = factory(require('jquery'), require('moment'));
  	}
  	else {
  		factory(jQuery, moment);
  	}
  })(function($, moment) {
  
  ;;
  
  var FC = $.fullCalendar = {
  	version: "3.6.1",
  	// When introducing internal API incompatibilities (where fullcalendar plugins would break),
  	// the minor version of the calendar should be upped (ex: 2.7.2 -> 2.8.0)
  	// and the below integer should be incremented.
  	internalApiVersion: 11
  };
  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 (options === 'getCalendar') {
  				if (!i) { // first element only
  					res = calendar;
  				}
  			}
  			else if (options === 'destroy') { // don't warn if no calendar object
  				if (calendar) {
  					calendar.destroy();
  					element.removeData('fullCalendar');
  				}
  			}
  			else if (!calendar) {
  				FC.warn("Attempting to call a FullCalendar method on an element with no calendar.");
  			}
  			else if ($.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');
  				}
  			}
  			else {
  				FC.warn("'" + options + "' is an unknown FullCalendar method.");
  			}
  		}
  		// a new calendar initialization
  		else if (!calendar) { // don't initialize twice
  			calendar = new Calendar(element, options);
  			element.data('fullCalendar', calendar);
  			calendar.render();
  		}
  	});
  
  	return res;
  };
  
  
  var complexOptions = [ // names of options that are objects whose properties should be combined
  	'header',
  	'footer',
  	'buttonText',
  	'buttonIcons',
  	'themeButtonIcons'
  ];
  
  
  // Merges an array of option objects into a single object
  function mergeOptions(optionObjs) {
  	return mergeProps(optionObjs, complexOptions);
  }
  
  ;;
  
  // exports
  FC.applyAll = applyAll;
  FC.debounce = debounce;
  FC.isInt = isInt;
  FC.htmlEscape = htmlEscape;
  FC.cssToStr = cssToStr;
  FC.proxy = proxy;
  FC.capitaliseFirstLetter = capitaliseFirstLetter;
  
  
  /* FullCalendar-specific DOM Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
  
  // Given the scrollbar widths of some other container, create borders/margins on rowEls in order to match the left
  // and right space that was offset by the scrollbars. A 1-pixel border first, then margin beyond that.
  function compensateScroll(rowEls, scrollbarWidths) {
  	if (scrollbarWidths.left) {
  		rowEls.css({
  			'border-left-width': 1,
  			'margin-left': scrollbarWidths.left - 1
  		});
  	}
  	if (scrollbarWidths.right) {
  		rowEls.css({
  			'border-right-width': 1,
  			'margin-right': scrollbarWidths.right - 1
  		});
  	}
  }
  
  
  // Undoes compensateScroll and restores all borders/margins
  function uncompensateScroll(rowEls) {
  	rowEls.css({
  		'margin-left': '',
  		'margin-right': '',
  		'border-left-width': '',
  		'border-right-width': ''
  	});
  }
  
  
  // Make the mouse cursor express that an event is not allowed in the current area
  function disableCursor() {
  	$('body').addClass('fc-not-allowed');
  }
  
  
  // Returns the mouse cursor to its original look
  function enableCursor() {
  	$('body').removeClass('fc-not-allowed');
  }
  
  
  // Given a total available height to fill, have `els` (essentially child rows) expand to accomodate.
  // By default, all elements that are shorter than the recommended height are expanded uniformly, not considering
  // any other els that are already too tall. if `shouldRedistribute` is on, it considers these tall rows and 
  // reduces the available height.
  function distributeHeight(els, availableHeight, shouldRedistribute) {
  
  	// *FLOORING NOTE*: we floor in certain places because zoom can give inaccurate floating-point dimensions,
  	// and it is better to be shorter than taller, to avoid creating unnecessary scrollbars.
  
  	var minOffset1 = Math.floor(availableHeight / els.length); // for non-last element
  	var minOffset2 = Math.floor(availableHeight - minOffset1 * (els.length - 1)); // for last element *FLOORING NOTE*
  	var flexEls = []; // elements that are allowed to expand. array of DOM nodes
  	var flexOffsets = []; // amount of vertical space it takes up
  	var flexHeights = []; // actual css height
  	var usedHeight = 0;
  
  	undistributeHeight(els); // give all elements their natural height
  
  	// find elements that are below the recommended height (expandable).
  	// important to query for heights in a single first pass (to avoid reflow oscillation).
  	els.each(function(i, el) {
  		var minOffset = i === els.length - 1 ? minOffset2 : minOffset1;
  		var naturalOffset = $(el).outerHeight(true);
  
  		if (naturalOffset < minOffset) {
  			flexEls.push(el);
  			flexOffsets.push(naturalOffset);
  			flexHeights.push($(el).height());
  		}
  		else {
  			// this element stretches past recommended height (non-expandable). mark the space as occupied.
  			usedHeight += naturalOffset;
  		}
  	});
  
  	// readjust the recommended height to only consider the height available to non-maxed-out rows.
  	if (shouldRedistribute) {
  		availableHeight -= usedHeight;
  		minOffset1 = Math.floor(availableHeight / flexEls.length);
  		minOffset2 = Math.floor(availableHeight - minOffset1 * (flexEls.length - 1)); // *FLOORING NOTE*
  	}
  
  	// assign heights to all expandable elements
  	$(flexEls).each(function(i, el) {
  		var minOffset = i === flexEls.length - 1 ? minOffset2 : minOffset1;
  		var naturalOffset = flexOffsets[i];
  		var naturalHeight = flexHeights[i];
  		var newHeight = minOffset - (naturalOffset - naturalHeight); // subtract the margin/padding
  
  		if (naturalOffset < minOffset) { // we check this again because redistribution might have changed things
  			$(el).height(newHeight);
  		}
  	});
  }
  
  
  // Undoes distrubuteHeight, restoring all els to their natural height
  function undistributeHeight(els) {
  	els.height('');
  }
  
  
  // Given `els`, a jQuery set of <td> cells, find the cell with the largest natural width and set the widths of all the
  // cells to be that width.
  // PREREQUISITE: if you want a cell to take up width, it needs to have a single inner element w/ display:inline
  function matchCellWidths(els) {
  	var maxInnerWidth = 0;
  
  	els.find('> *').each(function(i, innerEl) {
  		var innerWidth = $(innerEl).outerWidth();
  		if (innerWidth > maxInnerWidth) {
  			maxInnerWidth = innerWidth;
  		}
  	});
  
  	maxInnerWidth++; // sometimes not accurate of width the text needs to stay on one line. insurance
  
  	els.width(maxInnerWidth);
  
  	return maxInnerWidth;
  }
  
  
  // Given one element that resides inside another,
  // Subtracts the height of the inner element from the outer element.
  function subtractInnerElHeight(outerEl, innerEl) {
  	var both = outerEl.add(innerEl);
  	var diff;
  
  	// effin' IE8/9/10/11 sometimes returns 0 for dimensions. this weird hack was the only thing that worked
  	both.css({
  		position: 'relative', // cause a reflow, which will force fresh dimension recalculation
  		left: -1 // ensure reflow in case the el was already relative. negative is less likely to cause new scroll
  	});
  	diff = outerEl.outerHeight() - innerEl.outerHeight(); // grab the dimensions
  	both.css({ position: '', left: '' }); // undo hack
  
  	return diff;
  }
  
  
  /* Element Geom Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
  FC.getOuterRect = getOuterRect;
  FC.getClientRect = getClientRect;
  FC.getContentRect = getContentRect;
  FC.getScrollbarWidths = getScrollbarWidths;
  
  
  // borrowed from https://github.com/jquery/jquery-ui/blob/1.11.0/ui/core.js#L51
  function getScrollParent(el) {
  	var position = el.css('position'),
  		scrollParent = el.parents().filter(function() {
  			var parent = $(this);
  			return (/(auto|scroll)/).test(
  				parent.css('overflow') + parent.css('overflow-y') + parent.css('overflow-x')
  			);
  		}).eq(0);
  
  	return position === 'fixed' || !scrollParent.length ? $(el[0].ownerDocument || document) : scrollParent;
  }
  
  
  // Queries the outer bounding area of a jQuery element.
  // Returns a rectangle with absolute coordinates: left, right (exclusive), top, bottom (exclusive).
  // Origin is optional.
  function getOuterRect(el, origin) {
  	var offset = el.offset();
  	var left = offset.left - (origin ? origin.left : 0);
  	var top = offset.top - (origin ? origin.top : 0);
  
  	return {
  		left: left,
  		right: left + el.outerWidth(),
  		top: top,
  		bottom: top + el.outerHeight()
  	};
  }
  
  
  // Queries the area within the margin/border/scrollbars of a jQuery element. Does not go within the padding.
  // Returns a rectangle with absolute coordinates: left, right (exclusive), top, bottom (exclusive).
  // Origin is optional.
  // WARNING: given element can't have borders
  // NOTE: should use clientLeft/clientTop, but very unreliable cross-browser.
  function getClientRect(el, origin) {
  	var offset = el.offset();
  	var scrollbarWidths = getScrollbarWidths(el);
  	var left = offset.left + getCssFloat(el, 'border-left-width') + scrollbarWidths.left - (origin ? origin.left : 0);
  	var top = offset.top + getCssFloat(el, 'border-top-width') + scrollbarWidths.top - (origin ? origin.top : 0);
  
  	return {
  		left: left,
  		right: left + el[0].clientWidth, // clientWidth includes padding but NOT scrollbars
  		top: top,
  		bottom: top + el[0].clientHeight // clientHeight includes padding but NOT scrollbars
  	};
  }
  
  
  // Queries the area within the margin/border/padding of a jQuery element. Assumed not to have scrollbars.
  // Returns a rectangle with absolute coordinates: left, right (exclusive), top, bottom (exclusive).
  // Origin is optional.
  function getContentRect(el, origin) {
  	var offset = el.offset(); // just outside of border, margin not included
  	var left = offset.left + getCssFloat(el, 'border-left-width') + getCssFloat(el, 'padding-left') -
  		(origin ? origin.left : 0);
  	var top = offset.top + getCssFloat(el, 'border-top-width') + getCssFloat(el, 'padding-top') -
  		(origin ? origin.top : 0);
  
  	return {
  		left: left,
  		right: left + el.width(),
  		top: top,
  		bottom: top + el.height()
  	};
  }
  
  
  // Returns the computed left/right/top/bottom scrollbar widths for the given jQuery element.
  // WARNING: given element can't have borders (which will cause offsetWidth/offsetHeight to be larger).
  // NOTE: should use clientLeft/clientTop, but very unreliable cross-browser.
  function getScrollbarWidths(el) {
  	var leftRightWidth = el[0].offsetWidth - el[0].clientWidth;
  	var bottomWidth = el[0].offsetHeight - el[0].clientHeight;
  	var widths;
  
  	leftRightWidth = sanitizeScrollbarWidth(leftRightWidth);
  	bottomWidth = sanitizeScrollbarWidth(bottomWidth);
  
  	widths = { left: 0, right: 0, top: 0, bottom: bottomWidth };
  
  	if (getIsLeftRtlScrollbars() && el.css('direction') == 'rtl') { // is the scrollbar on the left side?
  		widths.left = leftRightWidth;
  	}
  	else {
  		widths.right = leftRightWidth;
  	}
  
  	return widths;
  }
  
  
  // The scrollbar width computations in getScrollbarWidths are sometimes flawed when it comes to
  // retina displays, rounding, and IE11. Massage them into a usable value.
  function sanitizeScrollbarWidth(width) {
  	width = Math.max(0, width); // no negatives
  	width = Math.round(width);
  	return width;
  }
  
  
  // Logic for determining if, when the element is right-to-left, the scrollbar appears on the left side
  
  var _isLeftRtlScrollbars = null;
  
  function getIsLeftRtlScrollbars() { // responsible for caching the computation
  	if (_isLeftRtlScrollbars === null) {
  		_isLeftRtlScrollbars = computeIsLeftRtlScrollbars();
  	}
  	return _isLeftRtlScrollbars;
  }
  
  function computeIsLeftRtlScrollbars() { // creates an offscreen test element, then removes it
  	var el = $('<div><div/></div>')
  		.css({
  			position: 'absolute',
  			top: -1000,
  			left: 0,
  			border: 0,
  			padding: 0,
  			overflow: 'scroll',
  			direction: 'rtl'
  		})
  		.appendTo('body');
  	var innerEl = el.children();
  	var res = innerEl.offset().left > el.offset().left; // is the inner div shifted to accommodate a left scrollbar?
  	el.remove();
  	return res;
  }
  
  
  // Retrieves a jQuery element's computed CSS value as a floating-point number.
  // If the queried value is non-numeric (ex: IE can return "medium" for border width), will just return zero.
  function getCssFloat(el, prop) {
  	return parseFloat(el.css(prop)) || 0;
  }
  
  
  /* Mouse / Touch Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
  FC.preventDefault = preventDefault;
  
  
  // Returns a boolean whether this was a left mouse click and no ctrl key (which means right click on Mac)
  function isPrimaryMouseButton(ev) {
  	return ev.which == 1 && !ev.ctrlKey;
  }
  
  
  function getEvX(ev) {
  	var touches = ev.originalEvent.touches;
  
  	// on mobile FF, pageX for touch events is present, but incorrect,
  	// so, look at touch coordinates first.
  	if (touches && touches.length) {
  		return touches[0].pageX;
  	}
  
  	return ev.pageX;
  }
  
  
  function getEvY(ev) {
  	var touches = ev.originalEvent.touches;
  
  	// on mobile FF, pageX for touch events is present, but incorrect,
  	// so, look at touch coordinates first.
  	if (touches && touches.length) {
  		return touches[0].pageY;
  	}
  
  	return ev.pageY;
  }
  
  
  function getEvIsTouch(ev) {
  	return /^touch/.test(ev.type);
  }
  
  
  function preventSelection(el) {
  	el.addClass('fc-unselectable')
  		.on('selectstart', preventDefault);
  }
  
  
  function allowSelection(el) {
  	el.removeClass('fc-unselectable')
  		.off('selectstart', preventDefault);
  }
  
  
  // Stops a mouse/touch event from doing it's native browser action
  function preventDefault(ev) {
  	ev.preventDefault();
  }
  
  
  /* General Geometry Utils
  ----------------------------------------------------------------------------------------------------------------------*/
  
  FC.intersectRects = intersectRects;
  
  // Returns a new rectangle that is the intersection of the two rectangles. If they don't intersect, returns false
  function intersectRects(rect1, rect2) {
  	var res = {
  		left: Math.max(rect1.left, rect2.left),
  		right: Math.min(rect1.right, rect2.right),
  		top: Math.max(rect1.top, rect2.top),
  		bottom: Math.min(rect1.bottom, rect2.bottom)
  	};
  
  	if (res.left < res.right && res.top < res.bottom) {
  		return res;
  	}
  	return false;
  }
  
  
  // Returns a new point that will have been moved to reside within the given rectangle
  function constrainPoint(point, rect) {
  	return {
  		left: Math.min(Math.max(point.left, rect.left), rect.right),
  		top: Math.min(Math.max(point.top, rect.top), rect.bottom)
  	};
  }
  
  
  // Returns a point that is the center of the given rectangle
  function getRectCenter(rect) {
  	return {
  		left: (rect.left + rect.right) / 2,
  		top: (rect.top + rect.bottom) / 2
  	};
  }
  
  
  // Subtracts point2's coordinates from point1's coordinates, returning a delta
  function diffPoints(point1, point2) {
  	return {
  		left: point1.left - point2.left,
  		top: point1.top - point2.top
  	};
  }
  
  
  /* Object Ordering by Field
  ----------------------------------------------------------------------------------------------------------------------*/
  
  FC.parseFieldSpecs = parseFieldSpecs;
  FC.compareByFieldSpecs = compareByFieldSpecs;
  FC.compareByFieldSpec = compareByFieldSpec;
  FC.flexibleCompare = flexibleCompare;
  
  
  function parseFieldSpecs(input) {
  	var specs = [];
  	var tokens = [];
  	var i, token;
  
  	if (typeof input === 'string') {
  		tokens = input.split(/\s*,\s*/);
  	}
  	else if (typeof input === 'function') {
  		tokens = [ input ];
  	}
  	else if ($.isArray(input)) {
  		tokens = input;
  	}
  
  	for (i = 0; i < tokens.length; i++) {
  		token = tokens[i];
  
  		if (typeof token === 'string') {
  			specs.push(
  				token.charAt(0) == '-' ?
  					{ field: token.substring(1), order: -1 } :
  					{ field: token, order: 1 }
  			);
  		}
  		else if (typeof token === 'function') {
  			specs.push({ func: token });
  		}
  	}
  
  	return specs;
  }
  
  
  function compareByFieldSpecs(obj1, obj2, fieldSpecs) {
  	var i;
  	var cmp;
  
  	for (i = 0; i < fieldSpecs.length; i++) {
  		cmp = compareByFieldSpec(obj1, obj2, fieldSpecs[i]);
  		if (cmp) {
  			return cmp;
  		}
  	}
  
  	return 0;
  }
  
  
  function compareByFieldSpec(obj1, obj2, fieldSpec) {
  	if (fieldSpec.func) {
  		return fieldSpec.func(obj1, obj2);
  	}
  	return flexibleCompare(obj1[fieldSpec.field], obj2[fieldSpec.field]) *
  		(fieldSpec.order || 1);
  }
  
  
  function flexibleCompare(a, b) {
  	if (!a && !b) {
  		return 0;
  	}
  	if (b == null) {
  		return -1;
  	}
  	if (a == null) {
  		return 1;
  	}
  	if ($.type(a) === 'string' || $.type(b) === 'string') {
  		return String(a).localeCompare(String(b));
  	}
  	return a - b;
  }
  
  
  /* Date Utilities
  ----------------------------------------------------------------------------------------------------------------------*/
  
  FC.computeGreatestUnit = computeGreatestUnit;
  FC.divideRangeByDuration = divideRangeByDuration;
  FC.divideDurationByDuration = divideDurationByDuration;
  FC.multiplyDuration = multiplyDuration;
  FC.durationHasTime = durationHasTime;
  
  var dayIDs = [ 'sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat' ];
  var unitsDesc = [ 'year', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond' ]; // descending
  
  
  // 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 computeGreatestUnit(start, end) {
  	var i, unit;
  	var val;
  
  	for (i = 0; i < unitsDesc.length; i++) {
  		unit = unitsDesc[i];
  		val = computeRangeAs(unit, start, end);
  
  		if (val >= 1 && isInt(val)) {
  			break;
  		}
  	}
  
  	return unit; // will be "milliseconds" if nothing else matches
  }
  
  
  // like computeGreatestUnit, but has special abilities to interpret the source input for clues
  function computeDurationGreatestUnit(duration, durationInput) {
  	var unit = computeGreatestUnit(duration);
  
  	// prevent days:7 from being interpreted as a week
  	if (unit === 'week' && typeof durationInput === 'object' && durationInput.days) {
  		unit = 'day';
  	}
  
  	return unit;
  }
  
  
  // 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 typeof str === 'string' &&
  		/^\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;
  }
  
  
  function copyOwnProps(src, dest) {
  	for (var name in src) {
  		if (hasOwnProp(src, name)) {
  			dest[name] = src[name];
  		}
  	}
  }
  
  
  function hasOwnProp(obj, name) {
  	return hasOwnPropMethod.call(obj, name);
  }
  
  
  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 removeMatching(array, testFunc) {
  	var removeCnt = 0;
  	var i = 0;
  
  	while (i < array.length) {
  		if (testFunc(array[i])) { // truthy value means *remove*
  			array.splice(i, 1);
  			removeCnt++;
  		}
  		else {
  			i++;
  		}
  	}
  
  	return removeCnt;
  }
  
  
  function removeExact(array, exactVal) {
  	var removeCnt = 0;
  	var i = 0;
  
  	while (i < array.length) {
  		if (array[i] === exactVal) {
  			array.splice(i, 1);
  			removeCnt++;
  		}
  		else {
  			i++;
  		}
  	}
  
  	return removeCnt;
  }
  FC.removeExact = removeExact;
  
  
  function isArraysEqual(a0, a1) {
  	var len = a0.length;
  	var i;
  
  	if (len == null || len !== a1.length) { // not array? or not same length?
  		return false;
  	}
  
  	for (i = 0; i < len; i++) {
  		if (a0[i] !== a1[i]) {
  			return false;
  		}
  	}
  
  	return true;
  }
  
  
  
  function firstDefined() {
  	for (var i=0; i<arguments.length; i++) {
  		if (arguments[i] !== undefined) {
  			return arguments[i];
  		}
  	}
  }
  
  
  function htmlEscape(s) {
  	return (s + '').replace(/&/g, '&amp;')
  		.replace(/</g, '&lt;')
  		.replace(/>/g, '&gt;')
  		.replace(/'/g, '&#039;')
  		.replace(/"/g, '&quot;')
  		.replace(/\n/g, '<br />');
  }
  
  
  function stripHtmlEntities(text) {
  	return text.replace(/&.*?;/g, '');
  }
  
  
  // Given a hash of CSS properties, returns a string of CSS.
  // Uses property names as-is (no camel-case conversion). Will not make statements for null/undefined values.
  function cssToStr(cssProps) {
  	var statements = [];
  
  	$.each(cssProps, function(name, val) {
  		if (val != null) {
  			statements.push(name + ':' + val);
  		}
  	});
  
  	return statements.join(';');
  }
  
  
  // Given an object hash of HTML attribute names to values,
  // generates a string that can be injected between < > in HTML
  function attrsToStr(attrs) {
  	var parts = [];
  
  	$.each(attrs, function(name, val) {
  		if (val != null) {
  			parts.push(name + '="' + htmlEscape(val) + '"');
  		}
  	});
  
  	return parts.join(' ');
  }
  
  
  function capitaliseFirstLetter(str) {
  	return str.charAt(0).toUpperCase() + str.slice(1);
  }
  
  
  function compareNumbers(a, b) { // for .sort()
  	return a - b;
  }
  
  
  function isInt(n) {
  	return n % 1 === 0;
  }
  
  
  // Returns a method bound to the given object context.
  // Just like one of the jQuery.proxy signatures, but without the undesired behavior of treating the same method with
  // different contexts as identical when binding/unbinding events.
  function proxy(obj, methodName) {
  	var method = obj[methodName];
  
  	return function() {
  		return method.apply(obj, arguments);
  	};
  }
  
  
  // Returns a function, that, as long as it continues to be invoked, will not
  // be triggered. The function will be called after it stops being called for
  // N milliseconds. If `immediate` is passed, trigger the function on the
  // leading edge, instead of the trailing.
  // https://github.com/jashkenas/underscore/blob/1.6.0/underscore.js#L714
  function debounce(func, wait, immediate) {
  	var timeout, args, context, timestamp, result;
  
  	var later = function() {
  		var last = +new Date() - timestamp;
  		if (last < wait) {
  			timeout = setTimeout(later, wait - last);
  		}
  		else {
  			timeout = null;
  			if (!immediate) {
  				result = func.apply(context, args);
  				context = args = null;
  			}
  		}
  	};
  
  	return function() {
  		context = this;
  		args = arguments;
  		timestamp = +new Date();
  		var callNow = immediate && !timeout;
  		if (!timeout) {
  			timeout = setTimeout(later, wait);
  		}
  		if (callNow) {
  			result = func.apply(context, args);
  			context = args = null;
  		}
  		return result;
  	};
  }
  
  ;;
  
  /*
  GENERAL NOTE on moments throughout the *entire rest* of the codebase:
  All moments are assumed to be ambiguously-zoned unless otherwise noted,
  with the NOTABLE EXCEOPTION of start/end dates that live on *Event Objects*.
  Ambiguously-TIMED moments are assumed to be ambiguously-zoned by nature.
  */
  
  var ambigDateOfMonthRegex = /^\s*\d{4}-\d\d$/;
  var ambigTimeOrZoneRegex =
  	/^\s*\d{4}-(?:(\d\d-\d\d)|(W\d\d$)|(W\d\d-\d)|(\d\d\d))((T| )(\d\d(:\d\d(:\d\d(\.\d+)?)?)?)?)?$/;
  var newMomentProto = moment.fn; // where we will attach our new methods
  var oldMomentProto = $.extend({}, newMomentProto); // copy of original moment methods
  
  // tell momentjs to transfer these properties upon clone
  var momentProperties = moment.momentProperties;
  momentProperties.push('_fullCalendar');
  momentProperties.push('_ambigTime');
  momentProperties.push('_ambigZone');
  
  
  // Creating
  // -------------------------------------------------------------------------------------------------
  
  // Creates a new moment, similar to the vanilla moment(...) constructor, but with
  // extra features (ambiguous time, enhanced formatting). When given an existing moment,
  // it will function as a clone (and retain the zone of the moment). Anything else will
  // result in a moment in the local zone.
  FC.moment = function() {
  	return makeMoment(arguments);
  };
  
  // Sames as FC.moment, but forces the resulting moment to be in the UTC timezone.
  FC.moment.utc = function() {
  	var mom = makeMoment(arguments, true);
  
  	// Force it into UTC because makeMoment doesn't guarantee it
  	// (if given a pre-existing moment for example)
  	if (mom.hasTime()) { // don't give ambiguously-timed moments a UTC zone
  		mom.utc();
  	}
  
  	return mom;
  };
  
  // Same as FC.moment, but when given an ISO8601 string, the timezone offset is preserved.
  // ISO8601 strings with no timezone offset will become ambiguously zoned.
  FC.moment.parseZone = function() {
  	return makeMoment(arguments, true, true);
  };
  
  // Builds an enhanced moment from args. When given an existing moment, it clones. When given a
  // native Date, or called with no arguments (the current time), the resulting moment will be local.
  // Anything else needs to be "parsed" (a string or an array), and will be affected by:
  //    parseAsUTC - if there is no zone information, should we parse the input in UTC?
  //    parseZone - if there is zone information, should we force the zone of the moment?
  function makeMoment(args, parseAsUTC, parseZone) {
  	var input = args[0];
  	var isSingleString = args.length == 1 && typeof input === 'string';
  	var isAmbigTime;
  	var isAmbigZone;
  	var ambigMatch;
  	var mom;
  
  	if (moment.isMoment(input) || isNativeDate(input) || input === undefined) {
  		mom = moment.apply(null, args);
  	}
  	else { // "parsing" is required
  		isAmbigTime = false;
  		isAmbigZone = false;
  
  		if (isSingleString) {
  			if (ambigDateOfMonthRegex.test(input)) {
  				// accept strings like '2014-05', but convert to the first of the month
  				input += '-01';
  				args = [ input ]; // for when we pass it on to moment's constructor
  				isAmbigTime = true;
  				isAmbigZone = true;
  			}
  			else if ((ambigMatch = ambigTimeOrZoneRegex.exec(input))) {
  				isAmbigTime = !ambigMatch[5]; // no time part?
  				isAmbigZone = true;
  			}
  		}
  		else if ($.isArray(input)) {
  			// arrays have no timezone information, so assume ambiguous zone
  			isAmbigZone = true;
  		}
  		// otherwise, probably a string with a format
  
  		if (parseAsUTC || isAmbigTime) {
  			mom = moment.utc.apply(moment, args);
  		}
  		else {
  			mom = moment.apply(null, args);
  		}
  
  		if (isAmbigTime) {
  			mom._ambigTime = true;
  			mom._ambigZone = true; // ambiguous time always means ambiguous zone
  		}
  		else if (parseZone) { // let's record the inputted zone somehow
  			if (isAmbigZone) {
  				mom._ambigZone = true;
  			}
  			else if (isSingleString) {
  				mom.utcOffset(input); // if not a valid zone, will assign UTC
  			}
  		}
  	}
  
  	mom._fullCalendar = true; // flag for extended functionality
  
  	return mom;
  }
  
  
  // Week Number
  // -------------------------------------------------------------------------------------------------
  
  
  // Returns the week number, considering the locale's custom week number calcuation
  // `weeks` is an alias for `week`
  newMomentProto.week = newMomentProto.weeks = function(input) {
  	var weekCalc = this._locale._fullCalendar_weekCalc;
  
  	if (input == null && typeof weekCalc === 'function') { // custom function only works for getter
  		return weekCalc(this);
  	}
  	else if (weekCalc === 'ISO') {
  		return oldMomentProto.isoWeek.apply(this, arguments); // ISO getter/setter
  	}
  
  	return oldMomentProto.week.apply(this, arguments); // local getter/setter
  };
  
  
  // Time-of-day
  // -------------------------------------------------------------------------------------------------
  
  // GETTER
  // Returns a Duration with the hours/minutes/seconds/ms values of the moment.
  // If the moment has an ambiguous time, a duration of 00:00 will be returned.
  //
  // SETTER
  // You can supply a Duration, a Moment, or a Duration-like argument.
  // When setting the time, and the moment has an ambiguous time, it then becomes unambiguous.
  newMomentProto.time = function(time) {
  
  	// Fallback to the original method (if there is one) if this moment wasn't created via FullCalendar.
  	// `time` is a generic enough method name where this precaution is necessary to avoid collisions w/ other plugins.
  	if (!this._fullCalendar) {
  		return oldMomentProto.time.apply(this, arguments);
  	}
  
  	if (time == null) { // getter
  		return moment.duration({
  			hours: this.hours(),
  			minutes: this.minutes(),
  			seconds: this.seconds(),
  			milliseconds: this.milliseconds()
  		});
  	}
  	else { // setter
  
  		this._ambigTime = false; // mark that the moment now has a time
  
  		if (!moment.isDuration(time) && !moment.isMoment(time)) {
  			time = moment.duration(time);
  		}
  
  		// The day value should cause overflow (so 24 hours becomes 00:00:00 of next day).
  		// Only for Duration times, not Moment times.
  		var dayHours = 0;
  		if (moment.isDuration(time)) {
  			dayHours = Math.floor(time.asDays()) * 24;
  		}
  
  		// We need to set the individual fields.
  		// Can't use startOf('day') then add duration. In case of DST at start of day.
  		return this.hours(dayHours + time.hours())
  			.minutes(time.minutes())
  			.seconds(time.seconds())
  			.milliseconds(time.milliseconds());
  	}
  };
  
  // Converts the moment to UTC, stripping out its time-of-day and timezone offset,
  // but preserving its YMD. A moment with a stripped time will display no time
  // nor timezone offset when .format() is called.
  newMomentProto.stripTime = function() {
  
  	if (!this._ambigTime) {
  
  		this.utc(true); // keepLocalTime=true (for keeping *date* value)
  
  		// set time to zero
  		this.set({
  			hours: 0,
  			minutes: 0,
  			seconds: 0,
  			ms: 0
  		});
  
  		// Mark the time as ambiguous. This needs to happen after the .utc() call, which might call .utcOffset(),
  		// which clears all ambig flags.
  		this._ambigTime = true;
  		this._ambigZone = true; // if ambiguous time, also ambiguous timezone offset
  	}
  
  	return this; // for chaining
  };
  
  // Returns if the moment has a non-ambiguous time (boolean)
  newMomentProto.hasTime = function() {
  	return !this._ambigTime;
  };
  
  
  // Timezone
  // -------------------------------------------------------------------------------------------------
  
  // Converts the moment to UTC, stripping out its timezone offset, but preserving its
  // YMD and time-of-day. A moment with a stripped timezone offset will display no
  // timezone offset when .format() is called.
  newMomentProto.stripZone = function() {
  	var wasAmbigTime;
  
  	if (!this._ambigZone) {
  
  		wasAmbigTime = this._ambigTime;
  
  		this.utc(true); // keepLocalTime=true (for keeping date and time values)
  
  		// the above call to .utc()/.utcOffset() unfortunately might clear the ambig flags, so restore
  		this._ambigTime = wasAmbigTime || false;
  
  		// Mark the zone as ambiguous. This needs to happen after the .utc() call, which might call .utcOffset(),
  		// which clears the ambig flags.
  		this._ambigZone = true;
  	}
  
  	return this; // for chaining
  };
  
  // Returns of the moment has a non-ambiguous timezone offset (boolean)
  newMomentProto.hasZone = function() {
  	return !this._ambigZone;
  };
  
  
  // implicitly marks a zone
  newMomentProto.local = function(keepLocalTime) {
  
  	// for when converting from ambiguously-zoned to local,
  	// keep the time values when converting from UTC -> local
  	oldMomentProto.local.call(this, this._ambigZone || keepLocalTime);
  
  	// ensure non-ambiguous
  	// this probably already happened via local() -> utcOffset(), but don't rely on Moment's internals
  	this._ambigTime = false;
  	this._ambigZone = false;
  
  	return this; // for chaining
  };
  
  
  // implicitly marks a zone
  newMomentProto.utc = function(keepLocalTime) {
  
  	oldMomentProto.utc.call(this, keepLocalTime);
  
  	// ensure non-ambiguous
  	// this probably already happened via utc() -> utcOffset(), but don't rely on Moment's internals
  	this._ambigTime = false;
  	this._ambigZone = false;
  
  	return this;
  };
  
  
  // implicitly marks a zone (will probably get called upon .utc() and .local())
  newMomentProto.utcOffset = function(tzo) {
  
  	if (tzo != null) { // setter
  		// these assignments needs to happen before the original zone method is called.
  		// I forget why, something to do with a browser crash.
  		this._ambigTime = false;
  		this._ambigZone = false;
  	}
  
  	return oldMomentProto.utcOffset.apply(this, arguments);
  };
  
  
  // Formatting
  // -------------------------------------------------------------------------------------------------
  
  newMomentProto.format = function() {
  
  	if (this._fullCalendar && arguments[0]) { // an enhanced moment? and a format string provided?
  		return formatDate(this, arguments[0]); // our extended formatting
  	}
  	if (this._ambigTime) {
  		return oldMomentFormat(englishMoment(this), 'YYYY-MM-DD');
  	}
  	if (this._ambigZone) {
  		return oldMomentFormat(englishMoment(this), 'YYYY-MM-DD[T]HH:mm:ss');
  	}
  	if (this._fullCalendar) { // enhanced non-ambig moment?
  		// moment.format() doesn't ensure english, but we want to.
  		return oldMomentFormat(englishMoment(this));
  	}
  
  	return oldMomentProto.format.apply(this, arguments);
  };
  
  newMomentProto.toISOString = function() {
  
  	if (this._ambigTime) {
  		return oldMomentFormat(englishMoment(this), 'YYYY-MM-DD');
  	}
  	if (this._ambigZone) {
  		return oldMomentFormat(englishMoment(this), 'YYYY-MM-DD[T]HH:mm:ss');
  	}
  	if (this._fullCalendar) { // enhanced non-ambig moment?
  		// depending on browser, moment might not output english. ensure english.
  		// https://github.com/moment/moment/blob/2.18.1/src/lib/moment/format.js#L22
  		return oldMomentProto.toISOString.apply(englishMoment(this), arguments);
  	}
  
  	return oldMomentProto.toISOString.apply(this, arguments);
  };
  
  function englishMoment(mom) {
  	if (mom.locale() !== 'en') {
  		return mom.clone().locale('en');
  	}
  	return mom;
  }
  
  ;;
  (function() {
  
  // exports
  FC.formatDate = formatDate;
  FC.formatRange = formatRange;
  FC.oldMomentFormat = oldMomentFormat;
  FC.queryMostGranularFormatUnit = queryMostGranularFormatUnit;
  
  
  // Config
  // ---------------------------------------------------------------------------------------------------------------------
  
  /*
  Inserted between chunks in the fake ("intermediate") formatting string.
  Important that it passes as whitespace (\s) because moment often identifies non-standalone months
  via a regexp with an \s.
  */
  var PART_SEPARATOR = '\u000b'; // vertical tab
  
  /*
  Inserted as the first character of a literal-text chunk to indicate that the literal text is not actually literal text,
  but rather, a "special" token that has custom rendering (see specialTokens map).
  */
  var SPECIAL_TOKEN_MARKER = '\u001f'; // information separator 1
  
  /*
  Inserted at the beginning and end of a span of text that must have non-zero numeric characters.
  Handling of these markers is done in a post-processing step at the very end of text rendering.
  */
  var MAYBE_MARKER = '\u001e'; // information separator 2
  var MAYBE_REGEXP = new RegExp(MAYBE_MARKER + '([^' + MAYBE_MARKER + ']*)' + MAYBE_MARKER, 'g'); // must be global
  
  /*
  Addition formatting tokens we want recognized
  */
  var specialTokens = {
  	t: function(date) { // "a" or "p"
  		return oldMomentFormat(date, 'a').charAt(0);
  	},
  	T: function(date) { // "A" or "P"
  		return oldMomentFormat(date, 'A').charAt(0);
  	}
  };
  
  /*
  The first characters of formatting tokens for units that are 1 day or larger.
  `value` is for ranking relative size (lower means bigger).
  `unit` is a normalized unit, used for comparing moments.
  */
  var largeTokenMap = {
  	Y: { value: 1, unit: 'year' },
  	M: { value: 2, unit: 'month' },
  	W: { value: 3, unit: 'week' }, // ISO week
  	w: { value: 3, unit: 'week' }, // local week
  	D: { value: 4, unit: 'day' }, // day of month
  	d: { value: 4, unit: 'day' } // day of week
  };
  
  
  // Single Date Formatting
  // ---------------------------------------------------------------------------------------------------------------------
  
  /*
  Formats `date` with a Moment formatting string, but allow our non-zero areas and special token
  */
  function formatDate(date, formatStr) {
  	return renderFakeFormatString(
  		getParsedFormatString(formatStr).fakeFormatString,
  		date
  	);
  }
  
  /*
  Call this if you want Moment's original format method to be used
  */
  function oldMomentFormat(mom, formatStr) {
  	return oldMomentProto.format.call(mom, formatStr); // oldMomentProto defined in moment-ext.js
  }
  
  
  // Date Range Formatting
  // -------------------------------------------------------------------------------------------------
  // TODO: make it work with timezone offset
  
  /*
  Using a formatting string meant for a single date, generate a range string, like
  "Sep 2 - 9 2013", that intelligently inserts a separator where the dates differ.
  If the dates are the same as far as the format string is concerned, just return a single
  rendering of one date, without any separator.
  */
  function formatRange(date1, date2, formatStr, separator, isRTL) {
  	var localeData;
  
  	date1 = FC.moment.parseZone(date1);
  	date2 = FC.moment.parseZone(date2);
  
  	localeData = date1.localeData();
  
  	// Expand localized format strings, like "LL" -> "MMMM D YYYY".
  	// BTW, this is not important for `formatDate` because it is impossible to put custom tokens
  	// or non-zero areas in Moment's localized format strings.
  	formatStr = localeData.longDateFormat(formatStr) || formatStr;
  
  	return renderParsedFormat(
  		getParsedFormatString(formatStr),
  		date1,
  		date2,
  		separator || ' - ',
  		isRTL
  	);
  }
  
  /*
  Renders a range with an already-parsed format string.
  */
  function renderParsedFormat(parsedFormat, date1, date2, separator, isRTL) {
  	var sameUnits = parsedFormat.sameUnits;
  	var unzonedDate1 = date1.clone().stripZone(); // for same-unit comparisons
  	var unzonedDate2 = date2.clone().stripZone(); // "
  
  	var renderedParts1 = renderFakeFormatStringParts(parsedFormat.fakeFormatString, date1);
  	var renderedParts2 = renderFakeFormatStringParts(parsedFormat.fakeFormatString, date2);
  
  	var leftI;
  	var leftStr = '';
  	var rightI;
  	var rightStr = '';
  	var middleI;
  	var middleStr1 = '';
  	var middleStr2 = '';
  	var middleStr = '';
  
  	// Start at the leftmost side of the formatting string and continue until you hit a token
  	// that is not the same between dates.
  	for (
  		leftI = 0;
  		leftI < sameUnits.length && (!sameUnits[leftI] || unzonedDate1.isSame(unzonedDate2, sameUnits[leftI]));
  		leftI++
  	) {
  		leftStr += renderedParts1[leftI];
  	}
  
  	// Similarly, start at the rightmost side of the formatting string and move left
  	for (
  		rightI = sameUnits.length - 1;
  		rightI > leftI && (!sameUnits[rightI] || unzonedDate1.isSame(unzonedDate2, sameUnits[rightI]));
  		rightI--
  	) {
  		// If current chunk is on the boundary of unique date-content, and is a special-case
  		// date-formatting postfix character, then don't consume it. Consider it unique date-content.
  		// TODO: make configurable
  		if (rightI - 1 === leftI && renderedParts1[rightI] === '.') {
  			break;
  		}
  
  		rightStr = renderedParts1[rightI] + rightStr;
  	}
  
  	// The area in the middle is different for both of the dates.
  	// Collect them distinctly so we can jam them together later.
  	for (middleI = leftI; middleI <= rightI; middleI++) {
  		middleStr1 += renderedParts1[middleI];
  		middleStr2 += renderedParts2[middleI];
  	}
  
  	if (middleStr1 || middleStr2) {
  		if (isRTL) {
  			middleStr = middleStr2 + separator + middleStr1;
  		}
  		else {
  			middleStr = middleStr1 + separator + middleStr2;
  		}
  	}
  
  	return processMaybeMarkers(
  		leftStr + middleStr + rightStr
  	);
  }
  
  
  // Format String Parsing
  // ---------------------------------------------------------------------------------------------------------------------
  
  var parsedFormatStrCache = {};
  
  /*
  Returns a parsed format string, leveraging a cache.
  */
  function getParsedFormatString(formatStr) {
  	return parsedFormatStrCache[formatStr] ||
  		(parsedFormatStrCache[formatStr] = parseFormatString(formatStr));
  }
  
  /*
  Parses a format string into the following:
  - fakeFormatString: a momentJS formatting string, littered with special control characters that get post-processed.
  - sameUnits: for every part in fakeFormatString, if the part is a token, the value will be a unit string (like "day"),
    that indicates how similar a range's start & end must be in order to share the same formatted text.
    If not a token, then the value is null.
    Always a flat array (not nested liked "chunks").
  */
  function parseFormatString(formatStr) {
  	var chunks = chunkFormatString(formatStr);
  	
  	return {
  		fakeFormatString: buildFakeFormatString(chunks),
  		sameUnits: buildSameUnits(chunks)
  	};
  }
  
  /*
  Break the formatting string into an array of chunks.
  A 'maybe' chunk will have nested chunks.
  */
  function chunkFormatString(formatStr) {
  	var chunks = [];
  	var match;
  
  	// TODO: more descrimination
  	// \4 is a backreference to the first character of a multi-character set.
  	var chunker = /\[([^\]]*)\]|\(([^\)]*)\)|(LTS|LT|(\w)\4*o?)|([^\w\[\(]+)/g;
  
  	while ((match = chunker.exec(formatStr))) {
  		if (match[1]) { // a literal string inside [ ... ]
  			chunks.push.apply(chunks, // append
  				splitStringLiteral(match[1])
  			);
  		}
  		else if (match[2]) { // non-zero formatting inside ( ... )
  			chunks.push({ maybe: chunkFormatString(match[2]) });
  		}
  		else if (match[3]) { // a formatting token
  			chunks.push({ token: match[3] });
  		}
  		else if (match[5]) { // an unenclosed literal string
  			chunks.push.apply(chunks, // append
  				splitStringLiteral(match[5])
  			);
  		}
  	}
  
  	return chunks;
  }
  
  /*
  Potentially splits a literal-text string into multiple parts. For special cases.
  */
  function splitStringLiteral(s) {
  	if (s === '. ') {
  		return [ '.', ' ' ]; // for locales with periods bound to the end of each year/month/date
  	}
  	else {
  		return [ s ];
  	}
  }
  
  /*
  Given chunks parsed from a real format string, generate a fake (aka "intermediate") format string with special control
  characters that will eventually be given to moment for formatting, and then post-processed.
  */
  function buildFakeFormatString(chunks) {
  	var parts = [];
  	var i, chunk;
  
  	for (i = 0; i < chunks.length; i++) {
  		chunk = chunks[i];
  
  		if (typeof chunk === 'string') {
  			parts.push('[' + chunk + ']');
  		}
  		else if (chunk.token) {
  			if (chunk.token in specialTokens) {
  				parts.push(
  					SPECIAL_TOKEN_MARKER + // useful during post-processing
  					'[' + chunk.token + ']' // preserve as literal text
  				);
  			}
  			else {
  				parts.push(chunk.token); // unprotected text implies a format string
  			}
  		}
  		else if (chunk.maybe) {
  			parts.push(
  				MAYBE_MARKER + // useful during post-processing
  				buildFakeFormatString(chunk.maybe) +
  				MAYBE_MARKER
  			);
  		}
  	}
  
  	return parts.join(PART_SEPARATOR);
  }
  
  /*
  Given parsed chunks from a real formatting string, generates an array of unit strings (like "day") that indicate
  in which regard two dates must be similar in order to share range formatting text.
  The `chunks` can be nested (because of "maybe" chunks), however, the returned array will be flat.
  */
  function buildSameUnits(chunks) {
  	var units = [];
  	var i, chunk;
  	var tokenInfo;
  
  	for (i = 0; i < chunks.length; i++) {
  		chunk = chunks[i];
  
  		if (chunk.token) {
  			tokenInfo = largeTokenMap[chunk.token.charAt(0)];
  			units.push(tokenInfo ? tokenInfo.unit : 'second'); // default to a very strict same-second
  		}
  		else if (chunk.maybe) {
  			units.push.apply(units, // append
  				buildSameUnits(chunk.maybe)
  			);
  		}
  		else {
  			units.push(null);
  		}
  	}
  
  	return units;
  }
  
  
  // Rendering to text
  // ---------------------------------------------------------------------------------------------------------------------
  
  /*
  Formats a date with a fake format string, post-processes the control characters, then returns.
  */
  function renderFakeFormatString(fakeFormatString, date) {
  	return processMaybeMarkers(
  		renderFakeFormatStringParts(fakeFormatString, date).join('')
  	);
  }
  
  /*
  Formats a date into parts that will have been post-processed, EXCEPT for the "maybe" markers.
  */
  function renderFakeFormatStringParts(fakeFormatString, date) {
  	var parts = [];
  	var fakeRender = oldMomentFormat(date, fakeFormatString);
  	var fakeParts = fakeRender.split(PART_SEPARATOR);
  	var i, fakePart;
  
  	for (i = 0; i < fakeParts.length; i++) {
  		fakePart = fakeParts[i];
  
  		if (fakePart.charAt(0) === SPECIAL_TOKEN_MARKER) {
  			parts.push(
  				// the literal string IS the token's name.
  				// call special token's registered function.
  				specialTokens[fakePart.substring(1)](date)
  			);
  		}
  		else {
  			parts.push(fakePart);
  		}
  	}
  
  	return parts;
  }
  
  /*
  Accepts an almost-finally-formatted string and processes the "maybe" control characters, returning a new string.
  */
  function processMaybeMarkers(s) {
  	return s.replace(MAYBE_REGEXP, function(m0, m1) { // regex assumed to have 'g' flag
  		if (m1.match(/[1-9]/)) { // any non-zero numeric characters?
  			return m1;
  		}
  		else {
  			return '';
  		}
  	});
  }
  
  
  // Misc Utils
  // -------------------------------------------------------------------------------------------------
  
  /*
  Returns a unit string, either 'year', 'month', 'day', or null for the most granular formatting token in the string.
  */
  function queryMostGranularFormatUnit(formatStr) {
  	var chunks = chunkFormatString(formatStr);
  	var i, chunk;
  	var candidate;
  	var best;
  
  	for (i = 0; i < chunks.length; i++) {
  		chunk = chunks[i];
  
  		if (chunk.token) {
  			candidate = largeTokenMap[chunk.token.charAt(0)];
  			if (candidate) {
  				if (!best || candidate.value > best.value) {
  					best = candidate;
  				}
  			}
  		}
  	}
  
  	if (best) {
  		return best.unit;
  	}
  
  	return null;
  };
  
  })();
  
  // quick local references
  var formatDate = FC.formatDate;
  var formatRange = FC.formatRange;
  var oldMomentFormat = FC.oldMomentFormat;
  
  ;;
  
  FC.Class = Class; // export
  
  // Class that all other classes will inherit from
  function Class() { }
  
  
  // Called on a class to create a subclass.
  // Last argument contains instance methods. Any argument before the last are considered mixins.
  Class.extend = function() {
  	var members = {};
  	var i;
  
  	for (i = 0; i < arguments.length; i++) {
  		copyOwnProps(arguments[i], members);
  	}
  
  	return extendClass(this, members);
  };
  
  
  // 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, this.prototype);
  };
  
  
  function extendClass(superClass, members) {
  	var subClass;
  
  	// ensure a constructor for the subclass, forwarding all arguments to the super-constructor if it doesn't exist
  	if (hasOwnProp(members, 'constructor')) {
  		subClass = members.constructor;
  	}
  	if (typeof subClass !== 'function') {
  		subClass = members.constructor = function() {
  			superClass.apply(this, arguments);
  		};
  	}
  
  	// build the base prototype for the subclass, which is an new object chained to the superclass's prototype
  	subClass.prototype = Object.create(superClass.prototype);
  
  	// copy each member variable/method onto the the subclass's prototype
  	copyOwnProps(members, subClass.prototype);
  
  	// copy over all class variables/methods to the subclass, such as `extend` and `mixin`
  	copyOwnProps(superClass, subClass);
  
  	return subClass;
  }
  
  ;;
  
  var EmitterMixin = FC.EmitterMixin = {
  
  	// jQuery-ification via $(this) allows a non-DOM object to have
  	// the same event handling capabilities (including namespaces).
  
  
  	on: function(types, handler) {
  		$(this).on(types, this._prepareIntercept(handler));
  		return this; // for chaining
  	},
  
  
  	one: function(types, handler) {
  		$(this).one(types, this._prepareIntercept(handler));
  		return this; // for chaining
  	},
  
  
  	_prepareIntercept: function(handler) {
  		// handlers are always called with an "event" object as their first param.
  		// sneak the `this` context and arguments into the extra parameter object
  		// and forward them on to the original handler.
  		var intercept = function(ev, extra) {
  			return handler.apply(
  				extra.context || this,
  				extra.args || []
  			);
  		};
  
  		// mimick jQuery's internal "proxy" system (risky, I know)
  		// causing all functions with the same .guid to appear to be the same.
  		// https://github.com/jquery/jquery/blob/2.2.4/src/core.js#L448
  		// this is needed for calling .off with the original non-intercept handler.
  		if (!handler.guid) {
  			handler.guid = $.guid++;
  		}
  		intercept.guid = handler.guid;
  
  		return intercept;
  	},
  
  
  	off: function(types, handler) {
  		$(this).off(types, handler);
  
  		return this; // for chaining
  	},
  
  
  	trigger: function(types) {
  		var args = Array.prototype.slice.call(arguments, 1); // arguments after the first
  
  		// pass in "extra" info to the intercept
  		$(this).triggerHandler(types, { args: args });
  
  		return this; // for chaining
  	},
  
  
  	triggerWith: function(types, context, args) {
  
  		// `triggerHandler` is less reliant on the DOM compared to `trigger`.
  		// pass in "extra" info to the intercept.
  		$(this).triggerHandler(types, { context: context, args: args });
  
  		return this; // for chaining
  	},
  
  
  	hasHandlers: function(type) {
  		var hash = $._data(this, 'events'); // http://blog.jquery.com/2012/08/09/jquery-1-8-released/
  
  		return hash && hash[type] && hash[type].length > 0;
  	}
  
  };
  
  ;;
  
  /*
  Utility methods for easily listening to events on another object,
  and more importantly, easily unlistening from them.
  */
  var ListenerMixin = FC.ListenerMixin = (function() {
  	var guid = 0;
  	var ListenerMixin = {
  
  		listenerId: null,
  
  		/*
  		Given an `other` object that has on/off methods, bind the given `callback` to an event by the given name.
  		The `callback` will be called with the `this` context of the object that .listenTo is being called on.
  		Can be called:
  			.listenTo(other, eventName, callback)
  		OR
  			.listenTo(other, {
  				eventName1: callback1,
  				eventName2: callback2
  			})
  		*/
  		listenTo: function(other, arg, callback) {
  			if (typeof arg === 'object') { // given dictionary of callbacks
  				for (var eventName in arg) {
  					if (arg.hasOwnProperty(eventName)) {
  						this.listenTo(other, eventName, arg[eventName]);
  					}
  				}
  			}
  			else if (typeof arg === 'string') {
  				other.on(
  					arg + '.' + this.getListenerNamespace(), // use event namespacing to identify this object
  					$.proxy(callback, this) // always use `this` context
  						// the usually-undesired jQuery guid behavior doesn't matter,
  						// because we always unbind via namespace
  				);
  			}
  		},
  
  		/*
  		Causes the current object to stop listening to events on the `other` object.
  		`eventName` is optional. If omitted, will stop listening to ALL events on `other`.
  		*/
  		stopListeningTo: function(other, eventName) {
  			other.off((eventName || '') + '.' + this.getListenerNamespace());
  		},
  
  		/*
  		Returns a string, unique to this object, to be used for event namespacing
  		*/
  		getListenerNamespace: function() {
  			if (this.listenerId == null) {
  				this.listenerId = guid++;
  			}
  			return '_listener' + this.listenerId;
  		}
  
  	};
  	return ListenerMixin;
  })();
  ;;
  
  var ParsableModelMixin = {
  
  	standardPropMap: {}, // will be cloned by defineStandardProps
  
  
  	/*
  	Returns true/false for success.
  	Meant to be only called ONCE, at object creation.
  	*/
  	applyProps: function(rawProps) {
  		var standardPropMap = this.standardPropMap;
  		var manualProps = {};
  		var miscProps = {};
  		var propName;
  
  		for (propName in rawProps) {
  			if (standardPropMap[propName] === true) { // copy verbatim
  				this[propName] = rawProps[propName];
  			}
  			else if (standardPropMap[propName] === false) {
  				manualProps[propName] = rawProps[propName];
  			}
  			else {
  				miscProps[propName] = rawProps[propName];
  			}
  		}
  
  		this.applyMiscProps(miscProps);
  
  		return this.applyManualStandardProps(manualProps);
  	},
  
  
  	/*
  	If subclasses override, they must call this supermethod and return the boolean response.
  	Meant to be only called ONCE, at object creation.
  	*/
  	applyManualStandardProps: function(rawProps) {
  		return true;
  	},
  
  
  	/*
  	Can be called even after initial object creation.
  	*/
  	applyMiscProps: function(rawProps) {
  		// subclasses can implement
  	},
  
  
  	/*
  	TODO: why is this a method when defineStandardProps is static
  	*/
  	isStandardProp: function(propName) {
  		return propName in this.standardPropMap;
  	}
  
  };
  
  
  /*
  TODO: devise a better system
  */
  var ParsableModelMixin_defineStandardProps = function(propDefs) {
  	var proto = this.prototype;
  
  	if (!proto.hasOwnProperty('standardPropMap')) {
  		proto.standardPropMap = Object.create(proto.standardPropMap);
  	}
  
  	copyOwnProps(propDefs, proto.standardPropMap);
  };
  
  
  /*
  TODO: devise a better system
  */
  var ParsableModelMixin_copyVerbatimStandardProps = function(src, dest) {
  	var map = this.prototype.standardPropMap;
  	var propName;
  
  	for (propName in map) {
  		if (
  			src[propName] != null && // in the src object?
  			map[propName] === true // false means "copy verbatim"
  		) {
  			dest[propName] = src[propName];
  		}
  	}
  };
  
  ;;
  
  var Model = Class.extend(EmitterMixin, ListenerMixin, {
  
  	_props: null,
  	_watchers: null,
  	_globalWatchArgs: {}, // mutation protection in Model.watch
  
  	constructor: function() {
  		this._watchers = {};
  		this._props = {};
  		this.applyGlobalWatchers();
  		this.constructed();
  	},
  
  	// useful for monkeypatching. TODO: BaseClass?
  	constructed: function() {
  	},
  
  	applyGlobalWatchers: function() {
  		var map = this._globalWatchArgs;
  		var name;
  
  		for (name in map) {
  			this.watch.apply(this, map[name]);
  		}
  	},
  
  	has: function(name) {
  		return name in this._props;
  	},
  
  	get: function(name) {
  		if (name === undefined) {
  			return this._props;
  		}
  
  		return this._props[name];
  	},
  
  	set: function(name, val) {
  		var newProps;
  
  		if (typeof name === 'string') {
  			newProps = {};
  			newProps[name] = val === undefined ? null : val;
  		}
  		else {
  			newProps = name;
  		}
  
  		this.setProps(newProps);
  	},
  
  	reset: function(newProps) {
  		var oldProps = this._props;
  		var changeset = {}; // will have undefined's to signal unsets
  		var name;
  
  		for (name in oldProps) {
  			changeset[name] = undefined;
  		}
  
  		for (name in newProps) {
  			changeset[name] = newProps[name];
  		}
  
  		this.setProps(changeset);
  	},
  
  	unset: function(name) { // accepts a string or array of strings
  		var newProps = {};
  		var names;
  		var i;
  
  		if (typeof name === 'string') {
  			names = [ name ];
  		}
  		else {
  			names = name;
  		}
  
  		for (i = 0; i < names.length; i++) {
  			newProps[names[i]] = undefined;
  		}
  
  		this.setProps(newProps);
  	},
  
  	setProps: function(newProps) {
  		var changedProps = {};
  		var changedCnt = 0;
  		var name, val;
  
  		for (name in newProps) {
  			val = newProps[name];
  
  			// a change in value?
  			// if an object, don't check equality, because might have been mutated internally.
  			// TODO: eventually enforce immutability.
  			if (
  				typeof val === 'object' ||
  				val !== this._props[name]
  			) {
  				changedProps[name] = val;
  				changedCnt++;
  			}
  		}
  
  		if (changedCnt) {
  
  			this.trigger('before:batchChange', changedProps);
  
  			for (name in changedProps) {
  				val = changedProps[name];
  
  				this.trigger('before:change', name, val);
  				this.trigger('before:change:' + name, val);
  			}
  
  			for (name in changedProps) {
  				val = changedProps[name];
  
  				if (val === undefined) {
  					delete this._props[name];
  				}
  				else {
  					this._props[name] = val;
  				}
  
  				this.trigger('change:' + name, val);
  				this.trigger('change', name, val);
  			}
  
  			this.trigger('batchChange', changedProps);
  		}
  	},
  
  	watch: function(name, depList, startFunc, stopFunc) {
  		var _this = this;
  
  		this.unwatch(name);
  
  		this._watchers[name] = this._watchDeps(depList, function(deps) {
  			var res = startFunc.call(_this, deps);
  
  			if (res && res.then) {
  				_this.unset(name); // put in an unset state while resolving
  				res.then(function(val) {
  					_this.set(name, val);
  				});
  			}
  			else {
  				_this.set(name, res);
  			}
  		}, function(deps) {
  			_this.unset(name);
  
  			if (stopFunc) {
  				stopFunc.call(_this, deps);
  			}
  		});
  	},
  
  	unwatch: function(name) {
  		var watcher = this._watchers[name];
  
  		if (watcher) {
  			delete this._watchers[name];
  			watcher.teardown();
  		}
  	},
  
  	_watchDeps: function(depList, startFunc, stopFunc) {
  		var _this = this;
  		var queuedChangeCnt = 0;
  		var depCnt = depList.length;
  		var satisfyCnt = 0;
  		var values = {}; // what's passed as the `deps` arguments
  		var bindTuples = []; // array of [ eventName, handlerFunc ] arrays
  		var isCallingStop = false;
  
  		function onBeforeDepChange(depName, val, isOptional) {
  			queuedChangeCnt++;
  			if (queuedChangeCnt === 1) { // first change to cause a "stop" ?
  				if (satisfyCnt === depCnt) { // all deps previously satisfied?
  					isCallingStop = true;
  					stopFunc(values);
  					isCallingStop = false;
  				}
  			}
  		}
  
  		function onDepChange(depName, val, isOptional) {
  
  			if (val === undefined) { // unsetting a value?
  
  				// required dependency that was previously set?
  				if (!isOptional && values[depName] !== undefined) {
  					satisfyCnt--;
  				}
  
  				delete values[depName];
  			}
  			else { // setting a value?
  
  				// required dependency that was previously unset?
  				if (!isOptional && values[depName] === undefined) {
  					satisfyCnt++;
  				}
  
  				values[depName] = val;
  			}
  
  			queuedChangeCnt--;
  			if (!queuedChangeCnt) { // last change to cause a "start"?
  
  				// now finally satisfied or satisfied all along?
  				if (satisfyCnt === depCnt) {
  
  					// if the stopFunc initiated another value change, ignore it.
  					// it will be processed by another change event anyway.
  					if (!isCallingStop) {
  						startFunc(values);
  					}
  				}
  			}
  		}
  
  		// intercept for .on() that remembers handlers
  		function bind(eventName, handler) {
  			_this.on(eventName, handler);
  			bindTuples.push([ eventName, handler ]);
  		}
  
  		// listen to dependency changes
  		depList.forEach(function(depName) {
  			var isOptional = false;
  
  			if (depName.charAt(0) === '?') { // TODO: more DRY
  				depName = depName.substring(1);
  				isOptional = true;
  			}
  
  			bind('before:change:' + depName, function(val) {
  				onBeforeDepChange(depName, val, isOptional);
  			});
  
  			bind('change:' + depName, function(val) {
  				onDepChange(depName, val, isOptional);
  			});
  		});
  
  		// process current dependency values
  		depList.forEach(function(depName) {
  			var isOptional = false;
  
  			if (depName.charAt(0) === '?') { // TODO: more DRY
  				depName = depName.substring(1);
  				isOptional = true;
  			}
  
  			if (_this.has(depName)) {
  				values[depName] = _this.get(depName);
  				satisfyCnt++;
  			}
  			else if (isOptional) {
  				satisfyCnt++;
  			}
  		});
  
  		// initially satisfied
  		if (satisfyCnt === depCnt) {
  			startFunc(values);
  		}
  
  		return {
  			teardown: function() {
  				// remove all handlers
  				for (var i = 0; i < bindTuples.length; i++) {
  					_this.off(bindTuples[i][0], bindTuples[i][1]);
  				}
  				bindTuples = null;
  
  				// was satisfied, so call stopFunc
  				if (satisfyCnt === depCnt) {
  					stopFunc();
  				}
  			},
  			flash: function() {
  				if (satisfyCnt === depCnt) {
  					stopFunc();
  					startFunc(values);
  				}
  			}
  		};
  	},
  
  	flash: function(name) {
  		var watcher = this._watchers[name];
  
  		if (watcher) {
  			watcher.flash();
  		}
  	}
  
  });
  
  
  Model.watch = function(name /* , depList, startFunc, stopFunc */) {
  
  	// subclasses should make a masked-copy of the superclass's map
  	// TODO: write test
  	if (!this.prototype.hasOwnProperty('_globalWatchArgs')) {
  		this.prototype._globalWatchArgs = Object.create(this.prototype._globalWatchArgs);
  	}
  
  	this.prototype._globalWatchArgs[name] = arguments;
  };
  
  
  FC.Model = Model;
  
  
  ;;
  
  var Promise = {
  
  	construct: function(executor) {
  		var deferred = $.Deferred();
  		var promise = deferred.promise();
  
  		if (typeof executor === 'function') {
  			executor(
  				function(val) { // resolve
  					deferred.resolve(val);
  					attachImmediatelyResolvingThen(promise, val);
  				},
  				function() { // reject
  					deferred.reject();
  					attachImmediatelyRejectingThen(promise);
  				}
  			);
  		}
  
  		return promise;
  	},
  
  	resolve: function(val) {
  		var deferred = $.Deferred().resolve(val);
  		var promise = deferred.promise();
  
  		attachImmediatelyResolvingThen(promise, val);
  
  		return promise;
  	},
  
  	reject: function() {
  		var deferred = $.Deferred().reject();
  		var promise = deferred.promise();
  
  		attachImmediatelyRejectingThen(promise);
  
  		return promise;
  	}
  
  };
  
  
  function attachImmediatelyResolvingThen(promise, val) {
  	promise.then = function(onResolve) {
  		if (typeof onResolve === 'function') {
  			return Promise.resolve(onResolve(val));
  		}
  		return promise;
  	};
  }
  
  
  function attachImmediatelyRejectingThen(promise) {
  	promise.then = function(onResolve, onReject) {
  		if (typeof onReject === 'function') {
  			onReject();
  		}
  		return promise;
  	};
  }
  
  
  FC.Promise = Promise;
  
  ;;
  
  var TaskQueue = Class.extend(EmitterMixin, {
  
  	q: null,
  	isPaused: false,
  	isRunning: false,
  
  
  	constructor: function() {
  		this.q = [];
  	},
  
  
  	queue: function(/* taskFunc, taskFunc... */) {
  		this.q.push.apply(this.q, arguments); // append
  		this.tryStart();
  	},
  
  
  	pause: function() {
  		this.isPaused = true;
  	},
  
  
  	resume: function() {
  		this.isPaused = false;
  		this.tryStart();
  	},
  
  
  	getIsIdle: function() {
  		return !this.isRunning && !this.isPaused;
  	},
  
  
  	tryStart: function() {
  		if (!this.isRunning && this.canRunNext()) {
  			this.isRunning = true;
  			this.trigger('start');
  			this.runRemaining();
  		}
  	},
  
  
  	canRunNext: function() {
  		return !this.isPaused && this.q.length;
  	},
  
  
  	runRemaining: function() { // assumes at least one task in queue. does not check canRunNext for first task.
  		var _this = this;
  		var task;
  		var res;
  
  		do {
  			task = this.q.shift(); // always freshly reference q. might have been reassigned.
  			res = this.runTask(task);
  
  			if (res && res.then) {
  				res.then(function() { // jshint ignore:line
  					if (_this.canRunNext()) {
  						_this.runRemaining();
  					}
  				});
  				return; // prevent marking as stopped
  			}
  		} while (this.canRunNext());
  
  		this.trigger('stop'); // not really a 'stop' ... more of a 'drained'
  		this.isRunning = false;
  
  		// if 'stop' handler added more tasks.... TODO: write test for this
  		this.tryStart();
  	},
  
  
  	runTask: function(task) {
  		return task(); // task *is* the function, but subclasses can change the format of a task
  	}
  
  });
  
  FC.TaskQueue = TaskQueue;
  
  ;;
  
  var RenderQueue = TaskQueue.extend({
  
  	waitsByNamespace: null,
  	waitNamespace: null,
  	waitId: null,
  
  
  	constructor: function(waitsByNamespace) {
  		TaskQueue.call(this); // super-constructor
  
  		this.waitsByNamespace = waitsByNamespace || {};
  	},
  
  
  	queue: function(taskFunc, namespace, type) {
  		var task = {
  			func: taskFunc,
  			namespace: namespace,
  			type: type
  		};
  		var waitMs;
  
  		if (namespace) {
  			waitMs = this.waitsByNamespace[namespace];
  		}
  
  		if (this.waitNamespace) {
  			if (namespace === this.waitNamespace && waitMs != null) {
  				this.delayWait(waitMs);
  			}
  			else {
  				this.clearWait();
  				this.tryStart();
  			}
  		}
  
  		if (this.compoundTask(task)) { // appended to queue?
  
  			if (!this.waitNamespace && waitMs != null) {
  				this.startWait(namespace, waitMs);
  			}
  			else {
  				this.tryStart();
  			}
  		}
  	},
  
  
  	startWait: function(namespace, waitMs) {
  		this.waitNamespace = namespace;
  		this.spawnWait(waitMs);
  	},
  
  
  	delayWait: function(waitMs) {
  		clearTimeout(this.waitId);
  		this.spawnWait(waitMs);
  	},
  
  
  	spawnWait: function(waitMs) {
  		var _this = this;
  
  		this.waitId = setTimeout(function() {
  			_this.waitNamespace = null;
  			_this.tryStart();
  		}, waitMs);
  	},
  
  
  	clearWait: function() {
  		if (this.waitNamespace) {
  			clearTimeout(this.waitId);
  			this.waitId = null;
  			this.waitNamespace = null;
  		}
  	},
  
  
  	canRunNext: function() {
  		if (!TaskQueue.prototype.canRunNext.apply(this, arguments)) {
  			return false;
  		}
  
  		// waiting for a certain namespace to stop receiving tasks?
  		if (this.waitNamespace) {
  
  			// if there was a different namespace task in the meantime,
  			// that forces all previously-waiting tasks to suddenly execute.
  			// TODO: find a way to do this in constant time.
  			for (var q = this.q, i = 0; i < q.length; i++) {
  				if (q[i].namespace !== this.waitNamespace) {
  					return true; // allow execution
  				}
  			}
  
  			return false;
  		}
  
  		return true;
  	},
  
  
  	runTask: function(task) {
  		task.func();
  	},
  
  
  	compoundTask: function(newTask) {
  		var q = this.q;
  		var shouldAppend = true;
  		var i, task;
  
  		if (newTask.namespace && newTask.type === 'destroy') {
  
  			// remove all init/add/remove ops with same namespace, regardless of order
  			for (i = q.length - 1; i >= 0; i--) {
  				task = q[i];
  
  				switch (task.type) {
  					case 'init':
  						shouldAppend = false; // jshint ignore:line
  						// the latest destroy is cancelled out by not doing the init
  						// and fallthrough....
  					case 'add':
  					case 'remove':
  						q.splice(i, 1); // remove task
  				}
  			}
  		}
  
  		if (shouldAppend) {
  			q.push(newTask);
  		}
  
  		return shouldAppend;
  	}
  
  });
  
  FC.RenderQueue = RenderQueue;
  
  ;;
  
  /* A rectangular panel that is absolutely positioned over other content
  ------------------------------------------------------------------------------------------------------------------------
  Options:
  	- className (string)
  	- content (HTML string or jQuery element set)
  	- parentEl
  	- top
  	- left
  	- right (the x coord of where the right edge should be. not a "CSS" right)
  	- autoHide (boolean)
  	- show (callback)
  	- hide (callback)
  */
  
  var Popover = Class.extend(ListenerMixin, {
  
  	isHidden: true,
  	options: null,
  	el: null, // the container element for the popover. generated by this object
  	margin: 10, // the space required between the popover and the edges of the scroll container
  
  
  	constructor: function(options) {
  		this.options = options || {};
  	},
  
  
  	// Shows the popover on the specified position. Renders it if not already
  	show: function() {
  		if (this.isHidden) {
  			if (!this.el) {
  				this.render();
  			}
  			this.el.show();
  			this.position();
  			this.isHidden = false;
  			this.trigger('show');
  		}
  	},
  
  
  	// Hides the popover, through CSS, but does not remove it from the DOM
  	hide: function() {
  		if (!this.isHidden) {
  			this.el.hide();
  			this.isHidden = true;
  			this.trigger('hide');
  		}
  	},
  
  
  	// Creates `this.el` and renders content inside of it
  	render: function() {
  		var _this = this;
  		var options = this.options;
  
  		this.el = $('<div class="fc-popover"/>')
  			.addClass(options.className || '')
  			.css({
  				// position initially to the top left to avoid creating scrollbars
  				top: 0,
  				left: 0
  			})
  			.append(options.content)
  			.appendTo(options.parentEl);
  
  		// when a click happens on anything inside with a 'fc-close' className, hide the popover
  		this.el.on('click', '.fc-close', function() {
  			_this.hide();
  		});
  
  		if (options.autoHide) {
  			this.listenTo($(document), 'mousedown', this.documentMousedown);
  		}
  	},
  
  
  	// Triggered when the user clicks *anywhere* in the document, for the autoHide feature
  	documentMousedown: function(ev) {
  		// only hide the popover if the click happened outside the popover
  		if (this.el && !$(ev.target).closest(this.el).length) {
  			this.hide();
  		}
  	},
  
  
  	// Hides and unregisters any handlers
  	removeElement: function() {
  		this.hide();
  
  		if (this.el) {
  			this.el.remove();
  			this.el = null;
  		}
  
  		this.stopListeningTo($(document), 'mousedown');
  	},
  
  
  	// Positions the popover optimally, using the top/left/right options
  	position: function() {
  		var options = this.options;
  		var origin = this.el.offsetParent().offset();
  		var width = this.el.outerWidth();
  		var height = this.el.outerHeight();
  		var windowEl = $(window);
  		var viewportEl = getScrollParent(this.el);
  		var viewportTop;
  		var viewportLeft;
  		var viewportOffset;
  		var top; // the "position" (not "offset") values for the popover
  		var left; //
  
  		// compute top and left
  		top = options.top || 0;
  		if (options.left !== undefined) {
  			left = options.left;
  		}
  		else if (options.right !== undefined) {
  			left = options.right - width; // derive the left value from the right value
  		}
  		else {
  			left = 0;
  		}
  
  		if (viewportEl.is(window) || viewportEl.is(document)) { // normalize getScrollParent's result
  			viewportEl = windowEl;
  			viewportTop = 0; // the window is always at the top left
  			viewportLeft = 0; // (and .offset() won't work if called here)
  		}
  		else {
  			viewportOffset = viewportEl.offset();
  			viewportTop = viewportOffset.top;
  			viewportLeft = viewportOffset.left;
  		}
  
  		// if the window is scrolled, it causes the visible area to be further down
  		viewportTop += windowEl.scrollTop();
  		viewportLeft += windowEl.scrollLeft();
  
  		// constrain to the view port. if constrained by two edges, give precedence to top/left
  		if (options.viewportConstrain !== false) {
  			top = Math.min(top, viewportTop + viewportEl.outerHeight() - height - this.margin);
  			top = Math.max(top, viewportTop + this.margin);
  			left = Math.min(left, viewportLeft + viewportEl.outerWidth() - width - this.margin);
  			left = Math.max(left, viewportLeft + this.margin);
  		}
  
  		this.el.css({
  			top: top - origin.top,
  			left: left - origin.left
  		});
  	},
  
  
  	// Triggers a callback. Calls a function in the option hash of the same name.
  	// Arguments beyond the first `name` are forwarded on.
  	// TODO: better code reuse for this. Repeat code
  	trigger: function(name) {
  		if (this.options[name]) {
  			this.options[name].apply(this, Array.prototype.slice.call(arguments, 1));
  		}
  	}
  
  });
  
  ;;
  
  /*
  A cache for the left/right/top/bottom/width/height values for one or more elements.
  Works with both offset (from topleft document) and position (from offsetParent).
  
  options:
  - els
  - isHorizontal
  - isVertical
  */
  var CoordCache = FC.CoordCache = Class.extend({
  
  	els: null, // jQuery set (assumed to be siblings)
  	forcedOffsetParentEl: null, // options can override the natural offsetParent
  	origin: null, // {left,top} position of offsetParent of els
  	boundingRect: null, // constrain cordinates to this rectangle. {left,right,top,bottom} or null
  	isHorizontal: false, // whether to query for left/right/width
  	isVertical: false, // whether to query for top/bottom/height
  
  	// arrays of coordinates (offsets from topleft of document)
  	lefts: null,
  	rights: null,
  	tops: null,
  	bottoms: null,
  
  
  	constructor: function(options) {
  		this.els = $(options.els);
  		this.isHorizontal = options.isHorizontal;
  		this.isVertical = options.isVertical;
  		this.forcedOffsetParentEl = options.offsetParent ? $(options.offsetParent) : null;
  	},
  
  
  	// Queries the els for coordinates and stores them.
  	// Call this method before using and of the get* methods below.
  	build: function() {
  		var offsetParentEl = this.forcedOffsetParentEl;
  		if (!offsetParentEl && this.els.length > 0) {
  			offsetParentEl = this.els.eq(0).offsetParent();
  		}
  
  		this.origin = offsetParentEl ?
  			offsetParentEl.offset() :
  			null;
  
  		this.boundingRect = this.queryBoundingRect();
  
  		if (this.isHorizontal) {
  			this.buildElHorizontals();
  		}
  		if (this.isVertical) {
  			this.buildElVerticals();
  		}
  	},
  
  
  	// Destroys all internal data about coordinates, freeing memory
  	clear: function() {
  		this.origin = null;
  		this.boundingRect = null;
  		this.lefts = null;
  		this.rights = null;
  		this.tops = null;
  		this.bottoms = null;
  	},
  
  
  	// When called, if coord caches aren't built, builds them
  	ensureBuilt: function() {
  		if (!this.origin) {
  			this.build();
  		}
  	},
  
  
  	// Populates the left/right internal coordinate arrays
  	buildElHorizontals: function() {
  		var lefts = [];
  		var rights = [];
  
  		this.els.each(function(i, node) {
  			var el = $(node);
  			var left = el.offset().left;
  			var width = el.outerWidth();
  
  			lefts.push(left);
  			rights.push(left + width);
  		});
  
  		this.lefts = lefts;
  		this.rights = rights;
  	},
  
  
  	// Populates the top/bottom internal coordinate arrays
  	buildElVerticals: function() {
  		var tops = [];
  		var bottoms = [];
  
  		this.els.each(function(i, node) {
  			var el = $(node);
  			var top = el.offset().top;
  			var height = el.outerHeight();
  
  			tops.push(top);
  			bottoms.push(top + height);
  		});
  
  		this.tops = tops;
  		this.bottoms = bottoms;
  	},
  
  
  	// Given a left offset (from document left), returns the index of the el that it horizontally intersects.
  	// If no intersection is made, returns undefined.
  	getHorizontalIndex: function(leftOffset) {
  		this.ensureBuilt();
  
  		var lefts = this.lefts;
  		var rights = this.rights;
  		var len = lefts.length;
  		var i;
  
  		for (i = 0; i < len; i++) {
  			if (leftOffset >= lefts[i] && leftOffset < rights[i]) {
  				return i;
  			}
  		}
  	},
  
  
  	// Given a top offset (from document top), returns the index of the el that it vertically intersects.
  	// If no intersection is made, returns undefined.
  	getVerticalIndex: function(topOffset) {
  		this.ensureBuilt();
  
  		var tops = this.tops;
  		var bottoms = this.bottoms;
  		var len = tops.length;
  		var i;
  
  		for (i = 0; i < len; i++) {
  			if (topOffset >= tops[i] && topOffset < bottoms[i]) {
  				return i;
  			}
  		}
  	},
  
  
  	// Gets the left offset (from document left) of the element at the given index
  	getLeftOffset: function(leftIndex) {
  		this.ensureBuilt();
  		return this.lefts[leftIndex];
  	},
  
  
  	// Gets the left position (from offsetParent left) of the element at the given index
  	getLeftPosition: function(leftIndex) {
  		this.ensureBuilt();
  		return this.lefts[leftIndex] - this.origin.left;
  	},
  
  
  	// Gets the right offset (from document left) of the element at the given index.
  	// This value is NOT relative to the document's right edge, like the CSS concept of "right" would be.
  	getRightOffset: function(leftIndex) {
  		this.ensureBuilt();
  		return this.rights[leftIndex];
  	},
  
  
  	// Gets the right position (from offsetParent left) of the element at the given index.
  	// This value is NOT relative to the offsetParent's right edge, like the CSS concept of "right" would be.
  	getRightPosition: function(leftIndex) {
  		this.ensureBuilt();
  		return this.rights[leftIndex] - this.origin.left;
  	},
  
  
  	// Gets the width of the element at the given index
  	getWidth: function(leftIndex) {
  		this.ensureBuilt();
  		return this.rights[leftIndex] - this.lefts[leftIndex];
  	},
  
  
  	// Gets the top offset (from document top) of the element at the given index
  	getTopOffset: function(topIndex) {
  		this.ensureBuilt();
  		return this.tops[topIndex];
  	},
  
  
  	// Gets the top position (from offsetParent top) of the element at the given position
  	getTopPosition: function(topIndex) {
  		this.ensureBuilt();
  		return this.tops[topIndex] - this.origin.top;
  	},
  
  	// Gets the bottom offset (from the document top) of the element at the given index.
  	// This value is NOT relative to the offsetParent's bottom edge, like the CSS concept of "bottom" would be.
  	getBottomOffset: function(topIndex) {
  		this.ensureBuilt();
  		return this.bottoms[topIndex];
  	},
  
  
  	// Gets the bottom position (from the offsetParent top) of the element at the given index.
  	// This value is NOT relative to the offsetParent's bottom edge, like the CSS concept of "bottom" would be.
  	getBottomPosition: function(topIndex) {
  		this.ensureBuilt();
  		return this.bottoms[topIndex] - this.origin.top;
  	},
  
  
  	// Gets the height of the element at the given index
  	getHeight: function(topIndex) {
  		this.ensureBuilt();
  		return this.bottoms[topIndex] - this.tops[topIndex];
  	},
  
  
  	// Bounding Rect
  	// TODO: decouple this from CoordCache
  
  	// Compute and return what the elements' bounding rectangle is, from the user's perspective.
  	// Right now, only returns a rectangle if constrained by an overflow:scroll element.
  	// Returns null if there are no elements
  	queryBoundingRect: function() {
  		var scrollParentEl;
  
  		if (this.els.length > 0) {
  			scrollParentEl = getScrollParent(this.els.eq(0));
  
  			if (!scrollParentEl.is(document)) {
  				return getClientRect(scrollParentEl);
  			}
  		}
  
  		return null;
  	},
  
  	isPointInBounds: function(leftOffset, topOffset) {
  		return this.isLeftInBounds(leftOffset) && this.isTopInBounds(topOffset);
  	},
  
  	isLeftInBounds: function(leftOffset) {
  		return !this.boundingRect || (leftOffset >= this.boundingRect.left && leftOffset < this.boundingRect.right);
  	},
  
  	isTopInBounds: function(topOffset) {
  		return !this.boundingRect || (topOffset >= this.boundingRect.top && topOffset < this.boundingRect.bottom);
  	}
  
  });
  
  ;;
  
  /* Tracks a drag's mouse movement, firing various handlers
  ----------------------------------------------------------------------------------------------------------------------*/
  // TODO: use Emitter
  
  var DragListener = FC.DragListener = Class.extend(ListenerMixin, {
  
  	options: null,
  	subjectEl: null,
  
  	// coordinates of the initial mousedown
  	originX: null,
  	originY: null,
  
  	// the wrapping element that scrolls, or MIGHT scroll if there's overflow.
  	// TODO: do this for wrappers that have overflow:hidden as well.
  	scrollEl: null,
  
  	isInteracting: false,
  	isDistanceSurpassed: false,
  	isDelayEnded: false,
  	isDragging: false,
  	isTouch: false,
  	isGeneric: false, // initiated by 'dragstart' (jqui)
  
  	delay: null,
  	delayTimeoutId: null,
  	minDistance: null,
  
  	shouldCancelTouchScroll: true,
  	scrollAlwaysKills: false,
  
  
  	constructor: function(options) {
  		this.options = options || {};
  	},
  
  
  	// Interaction (high-level)
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	startInteraction: function(ev, extraOptions) {
  
  		if (ev.type === 'mousedown') {
  			if (GlobalEmitter.get().shouldIgnoreMouse()) {
  				return;
  			}
  			else if (!isPrimaryMouseButton(ev)) {
  				return;
  			}
  			else {
  				ev.preventDefault(); // prevents native selection in most browsers
  			}
  		}
  
  		if (!this.isInteracting) {
  
  			// process options
  			extraOptions = extraOptions || {};
  			this.delay = firstDefined(extraOptions.delay, this.options.delay, 0);
  			this.minDistance = firstDefined(extraOptions.distance, this.options.distance, 0);
  			this.subjectEl = this.options.subjectEl;
  
  			preventSelection($('body'));
  
  			this.isInteracting = true;
  			this.isTouch = getEvIsTouch(ev);
  			this.isGeneric = ev.type === 'dragstart';
  			this.isDelayEnded = false;
  			this.isDistanceSurpassed = false;
  
  			this.originX = getEvX(ev);
  			this.originY = getEvY(ev);
  			this.scrollEl = getScrollParent($(ev.target));
  
  			this.bindHandlers();
  			this.initAutoScroll();
  			this.handleInteractionStart(ev);
  			this.startDelay(ev);
  
  			if (!this.minDistance) {
  				this.handleDistanceSurpassed(ev);
  			}
  		}
  	},
  
  
  	handleInteractionStart: function(ev) {
  		this.trigger('interactionStart', ev);
  	},
  
  
  	endInteraction: function(ev, isCancelled) {
  		if (this.isInteracting) {
  			this.endDrag(ev);
  
  			if (this.delayTimeoutId) {
  				clearTimeout(this.delayTimeoutId);
  				this.delayTimeoutId = null;
  			}
  
  			this.destroyAutoScroll();
  			this.unbindHandlers();
  
  			this.isInteracting = false;
  			this.handleInteractionEnd(ev, isCancelled);
  
  			allowSelection($('body'));
  		}
  	},
  
  
  	handleInteractionEnd: function(ev, isCancelled) {
  		this.trigger('interactionEnd', ev, isCancelled || false);
  	},
  
  
  	// Binding To DOM
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	bindHandlers: function() {
  		// some browsers (Safari in iOS 10) don't allow preventDefault on touch events that are bound after touchstart,
  		// so listen to the GlobalEmitter singleton, which is always bound, instead of the document directly.
  		var globalEmitter = GlobalEmitter.get();
  
  		if (this.isGeneric) {
  			this.listenTo($(document), { // might only work on iOS because of GlobalEmitter's bind :(
  				drag: this.handleMove,
  				dragstop: this.endInteraction
  			});
  		}
  		else if (this.isTouch) {
  			this.listenTo(globalEmitter, {
  				touchmove: this.handleTouchMove,
  				touchend: this.endInteraction,
  				scroll: this.handleTouchScroll
  			});
  		}
  		else {
  			this.listenTo(globalEmitter, {
  				mousemove: this.handleMouseMove,
  				mouseup: this.endInteraction
  			});
  		}
  
  		this.listenTo(globalEmitter, {
  			selectstart: preventDefault, // don't allow selection while dragging
  			contextmenu: preventDefault // long taps would open menu on Chrome dev tools
  		});
  	},
  
  
  	unbindHandlers: function() {
  		this.stopListeningTo(GlobalEmitter.get());
  		this.stopListeningTo($(document)); // for isGeneric
  	},
  
  
  	// Drag (high-level)
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	// extraOptions ignored if drag already started
  	startDrag: function(ev, extraOptions) {
  		this.startInteraction(ev, extraOptions); // ensure interaction began
  
  		if (!this.isDragging) {
  			this.isDragging = true;
  			this.handleDragStart(ev);
  		}
  	},
  
  
  	handleDragStart: function(ev) {
  		this.trigger('dragStart', ev);
  	},
  
  
  	handleMove: function(ev) {
  		var dx = getEvX(ev) - this.originX;
  		var dy = getEvY(ev) - this.originY;
  		var minDistance = this.minDistance;
  		var distanceSq; // current distance from the origin, squared
  
  		if (!this.isDistanceSurpassed) {
  			distanceSq = dx * dx + dy * dy;
  			if (distanceSq >= minDistance * minDistance) { // use pythagorean theorem
  				this.handleDistanceSurpassed(ev);
  			}
  		}
  
  		if (this.isDragging) {
  			this.handleDrag(dx, dy, ev);
  		}
  	},
  
  
  	// Called while the mouse is being moved and when we know a legitimate drag is taking place
  	handleDrag: function(dx, dy, ev) {
  		this.trigger('drag', dx, dy, ev);
  		this.updateAutoScroll(ev); // will possibly cause scrolling
  	},
  
  
  	endDrag: function(ev) {
  		if (this.isDragging) {
  			this.isDragging = false;
  			this.handleDragEnd(ev);
  		}
  	},
  
  
  	handleDragEnd: function(ev) {
  		this.trigger('dragEnd', ev);
  	},
  
  
  	// Delay
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	startDelay: function(initialEv) {
  		var _this = this;
  
  		if (this.delay) {
  			this.delayTimeoutId = setTimeout(function() {
  				_this.handleDelayEnd(initialEv);
  			}, this.delay);
  		}
  		else {
  			this.handleDelayEnd(initialEv);
  		}
  	},
  
  
  	handleDelayEnd: function(initialEv) {
  		this.isDelayEnded = true;
  
  		if (this.isDistanceSurpassed) {
  			this.startDrag(initialEv);
  		}
  	},
  
  
  	// Distance
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	handleDistanceSurpassed: function(ev) {
  		this.isDistanceSurpassed = true;
  
  		if (this.isDelayEnded) {
  			this.startDrag(ev);
  		}
  	},
  
  
  	// Mouse / Touch
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	handleTouchMove: function(ev) {
  
  		// prevent inertia and touchmove-scrolling while dragging
  		if (this.isDragging && this.shouldCancelTouchScroll) {
  			ev.preventDefault();
  		}
  
  		this.handleMove(ev);
  	},
  
  
  	handleMouseMove: function(ev) {
  		this.handleMove(ev);
  	},
  
  
  	// Scrolling (unrelated to auto-scroll)
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	handleTouchScroll: function(ev) {
  		// if the drag is being initiated by touch, but a scroll happens before
  		// the drag-initiating delay is over, cancel the drag
  		if (!this.isDragging || this.scrollAlwaysKills) {
  			this.endInteraction(ev, true); // isCancelled=true
  		}
  	},
  
  
  	// Utils
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	// Triggers a callback. Calls a function in the option hash of the same name.
  	// Arguments beyond the first `name` are forwarded on.
  	trigger: function(name) {
  		if (this.options[name]) {
  			this.options[name].apply(this, Array.prototype.slice.call(arguments, 1));
  		}
  		// makes _methods callable by event name. TODO: kill this
  		if (this['_' + name]) {
  			this['_' + name].apply(this, Array.prototype.slice.call(arguments, 1));
  		}
  	}
  
  
  });
  
  ;;
  /*
  this.scrollEl is set in DragListener
  */
  DragListener.mixin({
  
  	isAutoScroll: false,
  
  	scrollBounds: null, // { top, bottom, left, right }
  	scrollTopVel: null, // pixels per second
  	scrollLeftVel: null, // pixels per second
  	scrollIntervalId: null, // ID of setTimeout for scrolling animation loop
  
  	// defaults
  	scrollSensitivity: 30, // pixels from edge for scrolling to start
  	scrollSpeed: 200, // pixels per second, at maximum speed
  	scrollIntervalMs: 50, // millisecond wait between scroll increment
  
  
  	initAutoScroll: function() {
  		var scrollEl = this.scrollEl;
  
  		this.isAutoScroll =
  			this.options.scroll &&
  			scrollEl &&
  			!scrollEl.is(window) &&
  			!scrollEl.is(document);
  
  		if (this.isAutoScroll) {
  			// debounce makes sure rapid calls don't happen
  			this.listenTo(scrollEl, 'scroll', debounce(this.handleDebouncedScroll, 100));
  		}
  	},
  
  
  	destroyAutoScroll: function() {
  		this.endAutoScroll(); // kill any animation loop
  
  		// remove the scroll handler if there is a scrollEl
  		if (this.isAutoScroll) {
  			this.stopListeningTo(this.scrollEl, 'scroll'); // will probably get removed by unbindHandlers too :(
  		}
  	},
  
  
  	// Computes and stores the bounding rectangle of scrollEl
  	computeScrollBounds: function() {
  		if (this.isAutoScroll) {
  			this.scrollBounds = getOuterRect(this.scrollEl);
  			// TODO: use getClientRect in future. but prevents auto scrolling when on top of scrollbars
  		}
  	},
  
  
  	// Called when the dragging is in progress and scrolling should be updated
  	updateAutoScroll: function(ev) {
  		var sensitivity = this.scrollSensitivity;
  		var bounds = this.scrollBounds;
  		var topCloseness, bottomCloseness;
  		var leftCloseness, rightCloseness;
  		var topVel = 0;
  		var leftVel = 0;
  
  		if (bounds) { // only scroll if scrollEl exists
  
  			// compute closeness to edges. valid range is from 0.0 - 1.0
  			topCloseness = (sensitivity - (getEvY(ev) - bounds.top)) / sensitivity;
  			bottomCloseness = (sensitivity - (bounds.bottom - getEvY(ev))) / sensitivity;
  			leftCloseness = (sensitivity - (getEvX(ev) - bounds.left)) / sensitivity;
  			rightCloseness = (sensitivity - (bounds.right - getEvX(ev))) / sensitivity;
  
  			// translate vertical closeness into velocity.
  			// mouse must be completely in bounds for velocity to happen.
  			if (topCloseness >= 0 && topCloseness <= 1) {
  				topVel = topCloseness * this.scrollSpeed * -1; // negative. for scrolling up
  			}
  			else if (bottomCloseness >= 0 && bottomCloseness <= 1) {
  				topVel = bottomCloseness * this.scrollSpeed;
  			}
  
  			// translate horizontal closeness into velocity
  			if (leftCloseness >= 0 && leftCloseness <= 1) {
  				leftVel = leftCloseness * this.scrollSpeed * -1; // negative. for scrolling left
  			}
  			else if (rightCloseness >= 0 && rightCloseness <= 1) {
  				leftVel = rightCloseness * this.scrollSpeed;
  			}
  		}
  
  		this.setScrollVel(topVel, leftVel);
  	},
  
  
  	// Sets the speed-of-scrolling for the scrollEl
  	setScrollVel: function(topVel, leftVel) {
  
  		this.scrollTopVel = topVel;
  		this.scrollLeftVel = leftVel;
  
  		this.constrainScrollVel(); // massages into realistic values
  
  		// if there is non-zero velocity, and an animation loop hasn't already started, then START
  		if ((this.scrollTopVel || this.scrollLeftVel) && !this.scrollIntervalId) {
  			this.scrollIntervalId = setInterval(
  				proxy(this, 'scrollIntervalFunc'), // scope to `this`
  				this.scrollIntervalMs
  			);
  		}
  	},
  
  
  	// Forces scrollTopVel and scrollLeftVel to be zero if scrolling has already gone all the way
  	constrainScrollVel: function() {
  		var el = this.scrollEl;
  
  		if (this.scrollTopVel < 0) { // scrolling up?
  			if (el.scrollTop() <= 0) { // already scrolled all the way up?
  				this.scrollTopVel = 0;
  			}
  		}
  		else if (this.scrollTopVel > 0) { // scrolling down?
  			if (el.scrollTop() + el[0].clientHeight >= el[0].scrollHeight) { // already scrolled all the way down?
  				this.scrollTopVel = 0;
  			}
  		}
  
  		if (this.scrollLeftVel < 0) { // scrolling left?
  			if (el.scrollLeft() <= 0) { // already scrolled all the left?
  				this.scrollLeftVel = 0;
  			}
  		}
  		else if (this.scrollLeftVel > 0) { // scrolling right?
  			if (el.scrollLeft() + el[0].clientWidth >= el[0].scrollWidth) { // already scrolled all the way right?
  				this.scrollLeftVel = 0;
  			}
  		}
  	},
  
  
  	// This function gets called during every iteration of the scrolling animation loop
  	scrollIntervalFunc: function() {
  		var el = this.scrollEl;
  		var frac = this.scrollIntervalMs / 1000; // considering animation frequency, what the vel should be mult'd by
  
  		// change the value of scrollEl's scroll
  		if (this.scrollTopVel) {
  			el.scrollTop(el.scrollTop() + this.scrollTopVel * frac);
  		}
  		if (this.scrollLeftVel) {
  			el.scrollLeft(el.scrollLeft() + this.scrollLeftVel * frac);
  		}
  
  		this.constrainScrollVel(); // since the scroll values changed, recompute the velocities
  
  		// if scrolled all the way, which causes the vels to be zero, stop the animation loop
  		if (!this.scrollTopVel && !this.scrollLeftVel) {
  			this.endAutoScroll();
  		}
  	},
  
  
  	// Kills any existing scrolling animation loop
  	endAutoScroll: function() {
  		if (this.scrollIntervalId) {
  			clearInterval(this.scrollIntervalId);
  			this.scrollIntervalId = null;
  
  			this.handleScrollEnd();
  		}
  	},
  
  
  	// Get called when the scrollEl is scrolled (NOTE: this is delayed via debounce)
  	handleDebouncedScroll: function() {
  		// recompute all coordinates, but *only* if this is *not* part of our scrolling animation
  		if (!this.scrollIntervalId) {
  			this.handleScrollEnd();
  		}
  	},
  
  
  	// Called when scrolling has stopped, whether through auto scroll, or the user scrolling
  	handleScrollEnd: function() {
  	}
  
  });
  ;;
  
  /* Tracks mouse movements over a component and raises events about which hit the mouse is over.
  ------------------------------------------------------------------------------------------------------------------------
  options:
  - subjectEl
  - subjectCenter
  */
  
  var HitDragListener = DragListener.extend({
  
  	component: null, // converts coordinates to hits
  		// methods: hitsNeeded, hitsNotNeeded, queryHit
  
  	origHit: null, // the hit the mouse was over when listening started
  	hit: null, // the hit the mouse is over
  	coordAdjust: null, // delta that will be added to the mouse coordinates when computing collisions
  
  
  	constructor: function(component, options) {
  		DragListener.call(this, options); // call the super-constructor
  
  		this.component = component;
  	},
  
  
  	// Called when drag listening starts (but a real drag has not necessarily began).
  	// ev might be undefined if dragging was started manually.
  	handleInteractionStart: function(ev) {
  		var subjectEl = this.subjectEl;
  		var subjectRect;
  		var origPoint;
  		var point;
  
  		this.component.hitsNeeded();
  		this.computeScrollBounds(); // for autoscroll
  
  		if (ev) {
  			origPoint = { left: getEvX(ev), top: getEvY(ev) };
  			point = origPoint;
  
  			// constrain the point to bounds of the element being dragged
  			if (subjectEl) {
  				subjectRect = getOuterRect(subjectEl); // used for centering as well
  				point = constrainPoint(point, subjectRect);
  			}
  
  			this.origHit = this.queryHit(point.left, point.top);
  
  			// treat the center of the subject as the collision point?
  			if (subjectEl && this.options.subjectCenter) {
  
  				// only consider the area the subject overlaps the hit. best for large subjects.
  				// TODO: skip this if hit didn't supply left/right/top/bottom
  				if (this.origHit) {
  					subjectRect = intersectRects(this.origHit, subjectRect) ||
  						subjectRect; // in case there is no intersection
  				}
  
  				point = getRectCenter(subjectRect);
  			}
  
  			this.coordAdjust = diffPoints(point, origPoint); // point - origPoint
  		}
  		else {
  			this.origHit = null;
  			this.coordAdjust = null;
  		}
  
  		// call the super-method. do it after origHit has been computed
  		DragListener.prototype.handleInteractionStart.apply(this, arguments);
  	},
  
  
  	// Called when the actual drag has started
  	handleDragStart: function(ev) {
  		var hit;
  
  		DragListener.prototype.handleDragStart.apply(this, arguments); // call the super-method
  
  		// might be different from this.origHit if the min-distance is large
  		hit = this.queryHit(getEvX(ev), getEvY(ev));
  
  		// report the initial hit the mouse is over
  		// especially important if no min-distance and drag starts immediately
  		if (hit) {
  			this.handleHitOver(hit);
  		}
  	},
  
  
  	// Called when the drag moves
  	handleDrag: function(dx, dy, ev) {
  		var hit;
  
  		DragListener.prototype.handleDrag.apply(this, arguments); // call the super-method
  
  		hit = this.queryHit(getEvX(ev), getEvY(ev));
  
  		if (!isHitsEqual(hit, this.hit)) { // a different hit than before?
  			if (this.hit) {
  				this.handleHitOut();
  			}
  			if (hit) {
  				this.handleHitOver(hit);
  			}
  		}
  	},
  
  
  	// Called when dragging has been stopped
  	handleDragEnd: function() {
  		this.handleHitDone();
  		DragListener.prototype.handleDragEnd.apply(this, arguments); // call the super-method
  	},
  
  
  	// Called when a the mouse has just moved over a new hit
  	handleHitOver: function(hit) {
  		var isOrig = isHitsEqual(hit, this.origHit);
  
  		this.hit = hit;
  
  		this.trigger('hitOver', this.hit, isOrig, this.origHit);
  	},
  
  
  	// Called when the mouse has just moved out of a hit
  	handleHitOut: function() {
  		if (this.hit) {
  			this.trigger('hitOut', this.hit);
  			this.handleHitDone();
  			this.hit = null;
  		}
  	},
  
  
  	// Called after a hitOut. Also called before a dragStop
  	handleHitDone: function() {
  		if (this.hit) {
  			this.trigger('hitDone', this.hit);
  		}
  	},
  
  
  	// Called when the interaction ends, whether there was a real drag or not
  	handleInteractionEnd: function() {
  		DragListener.prototype.handleInteractionEnd.apply(this, arguments); // call the super-method
  
  		this.origHit = null;
  		this.hit = null;
  
  		this.component.hitsNotNeeded();
  	},
  
  
  	// Called when scrolling has stopped, whether through auto scroll, or the user scrolling
  	handleScrollEnd: function() {
  		DragListener.prototype.handleScrollEnd.apply(this, arguments); // call the super-method
  
  		// hits' absolute positions will be in new places after a user's scroll.
  		// HACK for recomputing.
  		if (this.isDragging) {
  			this.component.releaseHits();
  			this.component.prepareHits();
  		}
  	},
  
  
  	// Gets the hit underneath the coordinates for the given mouse event
  	queryHit: function(left, top) {
  
  		if (this.coordAdjust) {
  			left += this.coordAdjust.left;
  			top += this.coordAdjust.top;
  		}
  
  		return this.component.queryHit(left, top);
  	}
  
  });
  
  
  // Returns `true` if the hits are identically equal. `false` otherwise. Must be from the same component.
  // Two null values will be considered equal, as two "out of the component" states are the same.
  function isHitsEqual(hit0, hit1) {
  
  	if (!hit0 && !hit1) {
  		return true;
  	}
  
  	if (hit0 && hit1) {
  		return hit0.component === hit1.component &&
  			isHitPropsWithin(hit0, hit1) &&
  			isHitPropsWithin(hit1, hit0); // ensures all props are identical
  	}
  
  	return false;
  }
  
  
  // Returns true if all of subHit's non-standard properties are within superHit
  function isHitPropsWithin(subHit, superHit) {
  	for (var propName in subHit) {
  		if (!/^(component|left|right|top|bottom)$/.test(propName)) {
  			if (subHit[propName] !== superHit[propName]) {
  				return false;
  			}
  		}
  	}
  	return true;
  }
  
  ;;
  
  /*
  Listens to document and window-level user-interaction events, like touch events and mouse events,
  and fires these events as-is to whoever is observing a GlobalEmitter.
  Best when used as a singleton via GlobalEmitter.get()
  
  Normalizes mouse/touch events. For examples:
  - ignores the the simulated mouse events that happen after a quick tap: mousemove+mousedown+mouseup+click
  - compensates for various buggy scenarios where a touchend does not fire
  */
  
  FC.touchMouseIgnoreWait = 500;
  
  var GlobalEmitter = Class.extend(ListenerMixin, EmitterMixin, {
  
  	isTouching: false,
  	mouseIgnoreDepth: 0,
  	handleScrollProxy: null,
  
  
  	bind: function() {
  		var _this = this;
  
  		this.listenTo($(document), {
  			touchstart: this.handleTouchStart,
  			touchcancel: this.handleTouchCancel,
  			touchend: this.handleTouchEnd,
  			mousedown: this.handleMouseDown,
  			mousemove: this.handleMouseMove,
  			mouseup: this.handleMouseUp,
  			click: this.handleClick,
  			selectstart: this.handleSelectStart,
  			contextmenu: this.handleContextMenu
  		});
  
  		// because we need to call preventDefault
  		// because https://www.chromestatus.com/features/5093566007214080
  		// TODO: investigate performance because this is a global handler
  		window.addEventListener(
  			'touchmove',
  			this.handleTouchMoveProxy = function(ev) {
  				_this.handleTouchMove($.Event(ev));
  			},
  			{ passive: false } // allows preventDefault()
  		);
  
  		// attach a handler to get called when ANY scroll action happens on the page.
  		// this was impossible to do with normal on/off because 'scroll' doesn't bubble.
  		// http://stackoverflow.com/a/32954565/96342
  		window.addEventListener(
  			'scroll',
  			this.handleScrollProxy = function(ev) {
  				_this.handleScroll($.Event(ev));
  			},
  			true // useCapture
  		);
  	},
  
  	unbind: function() {
  		this.stopListeningTo($(document));
  
  		window.removeEventListener(
  			'touchmove',
  			this.handleTouchMoveProxy
  		);
  
  		window.removeEventListener(
  			'scroll',
  			this.handleScrollProxy,
  			true // useCapture
  		);
  	},
  
  
  	// Touch Handlers
  	// -----------------------------------------------------------------------------------------------------------------
  
  	handleTouchStart: function(ev) {
  
  		// if a previous touch interaction never ended with a touchend, then implicitly end it,
  		// but since a new touch interaction is about to begin, don't start the mouse ignore period.
  		this.stopTouch(ev, true); // skipMouseIgnore=true
  
  		this.isTouching = true;
  		this.trigger('touchstart', ev);
  	},
  
  	handleTouchMove: function(ev) {
  		if (this.isTouching) {
  			this.trigger('touchmove', ev);
  		}
  	},
  
  	handleTouchCancel: function(ev) {
  		if (this.isTouching) {
  			this.trigger('touchcancel', ev);
  
  			// Have touchcancel fire an artificial touchend. That way, handlers won't need to listen to both.
  			// If touchend fires later, it won't have any effect b/c isTouching will be false.
  			this.stopTouch(ev);
  		}
  	},
  
  	handleTouchEnd: function(ev) {
  		this.stopTouch(ev);
  	},
  
  
  	// Mouse Handlers
  	// -----------------------------------------------------------------------------------------------------------------
  
  	handleMouseDown: function(ev) {
  		if (!this.shouldIgnoreMouse()) {
  			this.trigger('mousedown', ev);
  		}
  	},
  
  	handleMouseMove: function(ev) {
  		if (!this.shouldIgnoreMouse()) {
  			this.trigger('mousemove', ev);
  		}
  	},
  
  	handleMouseUp: function(ev) {
  		if (!this.shouldIgnoreMouse()) {
  			this.trigger('mouseup', ev);
  		}
  	},
  
  	handleClick: function(ev) {
  		if (!this.shouldIgnoreMouse()) {
  			this.trigger('click', ev);
  		}
  	},
  
  
  	// Misc Handlers
  	// -----------------------------------------------------------------------------------------------------------------
  
  	handleSelectStart: function(ev) {
  		this.trigger('selectstart', ev);
  	},
  
  	handleContextMenu: function(ev) {
  		this.trigger('contextmenu', ev);
  	},
  
  	handleScroll: function(ev) {
  		this.trigger('scroll', ev);
  	},
  
  
  	// Utils
  	// -----------------------------------------------------------------------------------------------------------------
  
  	stopTouch: function(ev, skipMouseIgnore) {
  		if (this.isTouching) {
  			this.isTouching = false;
  			this.trigger('touchend', ev);
  
  			if (!skipMouseIgnore) {
  				this.startTouchMouseIgnore();
  			}
  		}
  	},
  
  	startTouchMouseIgnore: function() {
  		var _this = this;
  		var wait = FC.touchMouseIgnoreWait;
  
  		if (wait) {
  			this.mouseIgnoreDepth++;
  			setTimeout(function() {
  				_this.mouseIgnoreDepth--;
  			}, wait);
  		}
  	},
  
  	shouldIgnoreMouse: function() {
  		return this.isTouching || Boolean(this.mouseIgnoreDepth);
  	}
  
  });
  
  
  // Singleton
  // ---------------------------------------------------------------------------------------------------------------------
  
  (function() {
  	var globalEmitter = null;
  	var neededCount = 0;
  
  
  	// gets the singleton
  	GlobalEmitter.get = function() {
  
  		if (!globalEmitter) {
  			globalEmitter = new GlobalEmitter();
  			globalEmitter.bind();
  		}
  
  		return globalEmitter;
  	};
  
  
  	// called when an object knows it will need a GlobalEmitter in the near future.
  	GlobalEmitter.needed = function() {
  		GlobalEmitter.get(); // ensures globalEmitter
  		neededCount++;
  	};
  
  
  	// called when the object that originally called needed() doesn't need a GlobalEmitter anymore.
  	GlobalEmitter.unneeded = function() {
  		neededCount--;
  
  		if (!neededCount) { // nobody else needs it
  			globalEmitter.unbind();
  			globalEmitter = null;
  		}
  	};
  
  })();
  
  ;;
  
  /* Creates a clone of an element and lets it track the mouse as it moves
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var MouseFollower = Class.extend(ListenerMixin, {
  
  	options: null,
  
  	sourceEl: null, // the element that will be cloned and made to look like it is dragging
  	el: null, // the clone of `sourceEl` that will track the mouse
  	parentEl: null, // the element that `el` (the clone) will be attached to
  
  	// the initial position of el, relative to the offset parent. made to match the initial offset of sourceEl
  	top0: null,
  	left0: null,
  
  	// the absolute coordinates of the initiating touch/mouse action
  	y0: null,
  	x0: null,
  
  	// the number of pixels the mouse has moved from its initial position
  	topDelta: null,
  	leftDelta: null,
  
  	isFollowing: false,
  	isHidden: false,
  	isAnimating: false, // doing the revert animation?
  
  	constructor: function(sourceEl, options) {
  		this.options = options = options || {};
  		this.sourceEl = sourceEl;
  		this.parentEl = options.parentEl ? $(options.parentEl) : sourceEl.parent(); // default to sourceEl's parent
  	},
  
  
  	// Causes the element to start following the mouse
  	start: function(ev) {
  		if (!this.isFollowing) {
  			this.isFollowing = true;
  
  			this.y0 = getEvY(ev);
  			this.x0 = getEvX(ev);
  			this.topDelta = 0;
  			this.leftDelta = 0;
  
  			if (!this.isHidden) {
  				this.updatePosition();
  			}
  
  			if (getEvIsTouch(ev)) {
  				this.listenTo($(document), 'touchmove', this.handleMove);
  			}
  			else {
  				this.listenTo($(document), 'mousemove', this.handleMove);
  			}
  		}
  	},
  
  
  	// Causes the element to stop following the mouse. If shouldRevert is true, will animate back to original position.
  	// `callback` gets invoked when the animation is complete. If no animation, it is invoked immediately.
  	stop: function(shouldRevert, callback) {
  		var _this = this;
  		var revertDuration = this.options.revertDuration;
  
  		function complete() { // might be called by .animate(), which might change `this` context
  			_this.isAnimating = false;
  			_this.removeElement();
  
  			_this.top0 = _this.left0 = null; // reset state for future updatePosition calls
  
  			if (callback) {
  				callback();
  			}
  		}
  
  		if (this.isFollowing && !this.isAnimating) { // disallow more than one stop animation at a time
  			this.isFollowing = false;
  
  			this.stopListeningTo($(document));
  
  			if (shouldRevert && revertDuration && !this.isHidden) { // do a revert animation?
  				this.isAnimating = true;
  				this.el.animate({
  					top: this.top0,
  					left: this.left0
  				}, {
  					duration: revertDuration,
  					complete: complete
  				});
  			}
  			else {
  				complete();
  			}
  		}
  	},
  
  
  	// Gets the tracking element. Create it if necessary
  	getEl: function() {
  		var el = this.el;
  
  		if (!el) {
  			el = this.el = this.sourceEl.clone()
  				.addClass(this.options.additionalClass || '')
  				.css({
  					position: 'absolute',
  					visibility: '', // in case original element was hidden (commonly through hideEvents())
  					display: this.isHidden ? 'none' : '', // for when initially hidden
  					margin: 0,
  					right: 'auto', // erase and set width instead
  					bottom: 'auto', // erase and set height instead
  					width: this.sourceEl.width(), // explicit height in case there was a 'right' value
  					height: this.sourceEl.height(), // explicit width in case there was a 'bottom' value
  					opacity: this.options.opacity || '',
  					zIndex: this.options.zIndex
  				});
  
  			// we don't want long taps or any mouse interaction causing selection/menus.
  			// would use preventSelection(), but that prevents selectstart, causing problems.
  			el.addClass('fc-unselectable');
  
  			el.appendTo(this.parentEl);
  		}
  
  		return el;
  	},
  
  
  	// Removes the tracking element if it has already been created
  	removeElement: function() {
  		if (this.el) {
  			this.el.remove();
  			this.el = null;
  		}
  	},
  
  
  	// Update the CSS position of the tracking element
  	updatePosition: function() {
  		var sourceOffset;
  		var origin;
  
  		this.getEl(); // ensure this.el
  
  		// make sure origin info was computed
  		if (this.top0 === null) {
  			sourceOffset = this.sourceEl.offset();
  			origin = this.el.offsetParent().offset();
  			this.top0 = sourceOffset.top - origin.top;
  			this.left0 = sourceOffset.left - origin.left;
  		}
  
  		this.el.css({
  			top: this.top0 + this.topDelta,
  			left: this.left0 + this.leftDelta
  		});
  	},
  
  
  	// Gets called when the user moves the mouse
  	handleMove: function(ev) {
  		this.topDelta = getEvY(ev) - this.y0;
  		this.leftDelta = getEvX(ev) - this.x0;
  
  		if (!this.isHidden) {
  			this.updatePosition();
  		}
  	},
  
  
  	// Temporarily makes the tracking element invisible. Can be called before following starts
  	hide: function() {
  		if (!this.isHidden) {
  			this.isHidden = true;
  			if (this.el) {
  				this.el.hide();
  			}
  		}
  	},
  
  
  	// Show the tracking element after it has been temporarily hidden
  	show: function() {
  		if (this.isHidden) {
  			this.isHidden = false;
  			this.updatePosition();
  			this.getEl().show();
  		}
  	}
  
  });
  
  ;;
  
  /*
  Embodies a div that has potential scrollbars
  */
  var Scroller = FC.Scroller = Class.extend({
  
  	el: null, // the guaranteed outer element
  	scrollEl: null, // the element with the scrollbars
  	overflowX: null,
  	overflowY: null,
  
  
  	constructor: function(options) {
  		options = options || {};
  		this.overflowX = options.overflowX || options.overflow || 'auto';
  		this.overflowY = options.overflowY || options.overflow || 'auto';
  	},
  
  
  	render: function() {
  		this.el = this.renderEl();
  		this.applyOverflow();
  	},
  
  
  	renderEl: function() {
  		return (this.scrollEl = $('<div class="fc-scroller"></div>'));
  	},
  
  
  	// sets to natural height, unlocks overflow
  	clear: function() {
  		this.setHeight('auto');
  		this.applyOverflow();
  	},
  
  
  	destroy: function() {
  		this.el.remove();
  	},
  
  
  	// Overflow
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	applyOverflow: function() {
  		this.scrollEl.css({
  			'overflow-x': this.overflowX,
  			'overflow-y': this.overflowY
  		});
  	},
  
  
  	// Causes any 'auto' overflow values to resolves to 'scroll' or 'hidden'.
  	// Useful for preserving scrollbar widths regardless of future resizes.
  	// Can pass in scrollbarWidths for optimization.
  	lockOverflow: function(scrollbarWidths) {
  		var overflowX = this.overflowX;
  		var overflowY = this.overflowY;
  
  		scrollbarWidths = scrollbarWidths || this.getScrollbarWidths();
  
  		if (overflowX === 'auto') {
  			overflowX = (
  					scrollbarWidths.top || scrollbarWidths.bottom || // horizontal scrollbars?
  					// OR scrolling pane with massless scrollbars?
  					this.scrollEl[0].scrollWidth - 1 > this.scrollEl[0].clientWidth
  						// subtract 1 because of IE off-by-one issue
  				) ? 'scroll' : 'hidden';
  		}
  
  		if (overflowY === 'auto') {
  			overflowY = (
  					scrollbarWidths.left || scrollbarWidths.right || // vertical scrollbars?
  					// OR scrolling pane with massless scrollbars?
  					this.scrollEl[0].scrollHeight - 1 > this.scrollEl[0].clientHeight
  						// subtract 1 because of IE off-by-one issue
  				) ? 'scroll' : 'hidden';
  		}
  
  		this.scrollEl.css({ 'overflow-x': overflowX, 'overflow-y': overflowY });
  	},
  
  
  	// Getters / Setters
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	setHeight: function(height) {
  		this.scrollEl.height(height);
  	},
  
  
  	getScrollTop: function() {
  		return this.scrollEl.scrollTop();
  	},
  
  
  	setScrollTop: function(top) {
  		this.scrollEl.scrollTop(top);
  	},
  
  
  	getClientWidth: function() {
  		return this.scrollEl[0].clientWidth;
  	},
  
  
  	getClientHeight: function() {
  		return this.scrollEl[0].clientHeight;
  	},
  
  
  	getScrollbarWidths: function() {
  		return getScrollbarWidths(this.scrollEl);
  	}
  
  });
  
  ;;
  function Iterator(items) {
      this.items = items || [];
  }
  
  
  /* Calls a method on every item passing the arguments through */
  Iterator.prototype.proxyCall = function(methodName) {
      var args = Array.prototype.slice.call(arguments, 1);
      var results = [];
  
      this.items.forEach(function(item) {
          results.push(item[methodName].apply(item, args));
      });
  
      return results;
  };
  
  ;;
  
  var Interaction = Class.extend({
  
  	view: null,
  	component: null,
  
  
  	constructor: function(component) {
  		this.view = component._getView();
  		this.component = component;
  	},
  
  
  	opt: function(name) {
  		return this.view.opt(name);
  	},
  
  
  	end: function() {
  		// subclasses can implement
  	}
  
  });
  
  ;;
  
  var DateClicking = Interaction.extend({
  
  	dragListener: null,
  
  
  	/*
  	component must implement:
  		- bindDateHandlerToEl
  		- getSafeHitFootprint
  		- getHitEl
  	*/
  	constructor: function(component) {
  		Interaction.call(this, component);
  
  		this.dragListener = this.buildDragListener();
  	},
  
  
  	end: function() {
  		this.dragListener.endInteraction();
  	},
  
  
  	bindToEl: function(el) {
  		var component = this.component;
  		var dragListener = this.dragListener;
  
  		component.bindDateHandlerToEl(el, 'mousedown', function(ev) {
  			if (!component.shouldIgnoreMouse()) {
  				dragListener.startInteraction(ev);
  			}
  		});
  
  		component.bindDateHandlerToEl(el, 'touchstart', function(ev) {
  			if (!component.shouldIgnoreTouch()) {
  				dragListener.startInteraction(ev);
  			}
  		});
  	},
  
  
  	// Creates a listener that tracks the user's drag across day elements, for day clicking.
  	buildDragListener: function() {
  		var _this = this;
  		var component = this.component;
  		var dayClickHit; // null if invalid dayClick
  
  		var dragListener = new HitDragListener(component, {
  			scroll: this.opt('dragScroll'),
  			interactionStart: function() {
  				dayClickHit = dragListener.origHit;
  			},
  			hitOver: function(hit, isOrig, origHit) {
  				// if user dragged to another cell at any point, it can no longer be a dayClick
  				if (!isOrig) {
  					dayClickHit = null;
  				}
  			},
  			hitOut: function() { // called before mouse moves to a different hit OR moved out of all hits
  				dayClickHit = null;
  			},
  			interactionEnd: function(ev, isCancelled) {
  				var componentFootprint;
  
  				if (!isCancelled && dayClickHit) {
  					componentFootprint = component.getSafeHitFootprint(dayClickHit);
  
  					if (componentFootprint) {
  						_this.view.triggerDayClick(componentFootprint, component.getHitEl(dayClickHit), ev);
  					}
  				}
  			}
  		});
  
  		// because dragListener won't be called with any time delay, "dragging" will begin immediately,
  		// which will kill any touchmoving/scrolling. Prevent this.
  		dragListener.shouldCancelTouchScroll = false;
  
  		dragListener.scrollAlwaysKills = true;
  
  		return dragListener;
  	}
  
  });
  
  ;;
  
  var DateSelecting = FC.DateSelecting = Interaction.extend({
  
  	dragListener: null,
  
  
  	/*
  	component must implement:
  		- bindDateHandlerToEl
  		- getSafeHitFootprint
  		- renderHighlight
  		- unrenderHighlight
  	*/
  	constructor: function(component) {
  		Interaction.call(this, component);
  
  		this.dragListener = this.buildDragListener();
  	},
  
  
  	end: function() {
  		this.dragListener.endInteraction();
  	},
  
  
  	getDelay: function() {
  		var delay = this.opt('selectLongPressDelay');
  
  		if (delay == null) {
  			delay = this.opt('longPressDelay'); // fallback
  		}
  
  		return delay;
  	},
  
  
  	bindToEl: function(el) {
  		var _this = this;
  		var component = this.component;
  		var dragListener = this.dragListener;
  
  		component.bindDateHandlerToEl(el, 'mousedown', function(ev) {
  			if (_this.opt('selectable') && !component.shouldIgnoreMouse()) {
  				dragListener.startInteraction(ev, {
  					distance: _this.opt('selectMinDistance')
  				});
  			}
  		});
  
  		component.bindDateHandlerToEl(el, 'touchstart', function(ev) {
  			if (_this.opt('selectable') && !component.shouldIgnoreTouch()) {
  				dragListener.startInteraction(ev, {
  					delay: _this.getDelay()
  				});
  			}
  		});
  
  		preventSelection(el);
  	},
  
  
  	// Creates a listener that tracks the user's drag across day elements, for day selecting.
  	buildDragListener: function() {
  		var _this = this;
  		var component = this.component;
  		var selectionFootprint; // null if invalid selection
  
  		var dragListener = new HitDragListener(component, {
  			scroll: this.opt('dragScroll'),
  			interactionStart: function() {
  				selectionFootprint = null;
  			},
  			dragStart: function(ev) {
  				_this.view.unselect(ev); // since we could be rendering a new selection, we want to clear any old one
  			},
  			hitOver: function(hit, isOrig, origHit) {
  				var origHitFootprint;
  				var hitFootprint;
  
  				if (origHit) { // click needs to have started on a hit
  
  					origHitFootprint = component.getSafeHitFootprint(origHit);
  					hitFootprint = component.getSafeHitFootprint(hit);
  
  					if (origHitFootprint && hitFootprint) {
  						selectionFootprint = _this.computeSelection(origHitFootprint, hitFootprint);
  					}
  					else {
  						selectionFootprint = null;
  					}
  
  					if (selectionFootprint) {
  						component.renderSelectionFootprint(selectionFootprint);
  					}
  					else if (selectionFootprint === false) {
  						disableCursor();
  					}
  				}
  			},
  			hitOut: function() { // called before mouse moves to a different hit OR moved out of all hits
  				selectionFootprint = null;
  				component.unrenderSelection();
  			},
  			hitDone: function() { // called after a hitOut OR before a dragEnd
  				enableCursor();
  			},
  			interactionEnd: function(ev, isCancelled) {
  				if (!isCancelled && selectionFootprint) {
  					// the selection will already have been rendered. just report it
  					_this.view.reportSelection(selectionFootprint, ev);
  				}
  			}
  		});
  
  		return dragListener;
  	},
  
  
  	// Given the first and last date-spans of a selection, returns another date-span object.
  	// Subclasses can override and provide additional data in the span object. Will be passed to renderSelectionFootprint().
  	// Will return false if the selection is invalid and this should be indicated to the user.
  	// Will return null/undefined if a selection invalid but no error should be reported.
  	computeSelection: function(footprint0, footprint1) {
  		var wholeFootprint = this.computeSelectionFootprint(footprint0, footprint1);
  
  		if (wholeFootprint && !this.isSelectionFootprintAllowed(wholeFootprint)) {
  			return false;
  		}
  
  		return wholeFootprint;
  	},
  
  
  	// Given two spans, must return the combination of the two.
  	// TODO: do this separation of concerns (combining VS validation) for event dnd/resize too.
  	// Assumes both footprints are non-open-ended.
  	computeSelectionFootprint: function(footprint0, footprint1) {
  		var ms = [
  			footprint0.unzonedRange.startMs,
  			footprint0.unzonedRange.endMs,
  			footprint1.unzonedRange.startMs,
  			footprint1.unzonedRange.endMs
  		];
  
  		ms.sort(compareNumbers);
  
  		return new ComponentFootprint(
  			new UnzonedRange(ms[0], ms[3]),
  			footprint0.isAllDay
  		);
  	},
  
  
  	isSelectionFootprintAllowed: function(componentFootprint) {
  		return this.component.dateProfile.validUnzonedRange.containsRange(componentFootprint.unzonedRange) &&
  			this.view.calendar.isSelectionFootprintAllowed(componentFootprint);
  	}
  
  });
  
  ;;
  
  var EventDragging = FC.EventDragging = Interaction.extend({
  
  	eventPointing: null,
  	dragListener: null,
  	isDragging: false,
  
  
  	/*
  	component implements:
  		- bindSegHandlerToEl
  		- publiclyTrigger
  		- diffDates
  		- eventRangesToEventFootprints
  		- isEventInstanceGroupAllowed
  	*/
  	constructor: function(component, eventPointing) {
  		Interaction.call(this, component);
  
  		this.eventPointing = eventPointing;
  	},
  
  
  	end: function() {
  		if (this.dragListener) {
  			this.dragListener.endInteraction();
  		}
  	},
  
  
  	getSelectionDelay: function() {
  		var delay = this.opt('eventLongPressDelay');
  
  		if (delay == null) {
  			delay = this.opt('longPressDelay'); // fallback
  		}
  
  		return delay;
  	},
  
  
  	bindToEl: function(el) {
  		var component = this.component;
  
  		component.bindSegHandlerToEl(el, 'mousedown', this.handleMousedown.bind(this));
  		component.bindSegHandlerToEl(el, 'touchstart', this.handleTouchStart.bind(this));
  	},
  
  
  	handleMousedown: function(seg, ev) {
  		if (this.component.canStartDrag(seg, ev)) {
  			this.buildDragListener(seg).startInteraction(ev, { distance: 5 });
  		}
  	},
  
  
  	handleTouchStart: function(seg, ev) {
  		var component = this.component;
  		var settings = {
  			delay: this.view.isEventDefSelected(seg.footprint.eventDef) ? // already selected?
  				0 : this.getSelectionDelay()
  		};
  
  		if (component.canStartDrag(seg, ev)) {
  			this.buildDragListener(seg).startInteraction(ev, settings);
  		}
  		else if (component.canStartSelection(seg, ev)) {
  			this.buildSelectListener(seg).startInteraction(ev, settings);
  		}
  	},
  
  
  	// seg isn't draggable, but let's use a generic DragListener
  	// simply for the delay, so it can be selected.
  	// Has side effect of setting/unsetting `dragListener`
  	buildSelectListener: function(seg) {
  		var _this = this;
  		var view = this.view;
  		var eventDef = seg.footprint.eventDef;
  		var eventInstance = seg.footprint.eventInstance; // null for inverse-background events
  
  		if (this.dragListener) {
  			return this.dragListener;
  		}
  
  		var dragListener = this.dragListener = new DragListener({
  			dragStart: function(ev) {
  				if (
  					dragListener.isTouch &&
  					!view.isEventDefSelected(eventDef) &&
  					eventInstance
  				) {
  					// if not previously selected, will fire after a delay. then, select the event
  					view.selectEventInstance(eventInstance);
  				}
  			},
  			interactionEnd: function(ev) {
  				_this.dragListener = null;
  			}
  		});
  
  		return dragListener;
  	},
  
  
  	// Builds a listener that will track user-dragging on an event segment.
  	// Generic enough to work with any type of Grid.
  	// Has side effect of setting/unsetting `dragListener`
  	buildDragListener: function(seg) {
  		var _this = this;
  		var component = this.component;
  		var view = this.view;
  		var calendar = view.calendar;
  		var eventManager = calendar.eventManager;
  		var el = seg.el;
  		var eventDef = seg.footprint.eventDef;
  		var eventInstance = seg.footprint.eventInstance; // null for inverse-background events
  		var isDragging;
  		var mouseFollower; // A clone of the original element that will move with the mouse
  		var eventDefMutation;
  
  		if (this.dragListener) {
  			return this.dragListener;
  		}
  
  		// Tracks mouse movement over the *view's* coordinate map. Allows dragging and dropping between subcomponents
  		// of the view.
  		var dragListener = this.dragListener = new HitDragListener(view, {
  			scroll: this.opt('dragScroll'),
  			subjectEl: el,
  			subjectCenter: true,
  			interactionStart: function(ev) {
  				seg.component = component; // for renderDrag
  				isDragging = false;
  				mouseFollower = new MouseFollower(seg.el, {
  					additionalClass: 'fc-dragging',
  					parentEl: view.el,
  					opacity: dragListener.isTouch ? null : _this.opt('dragOpacity'),
  					revertDuration: _this.opt('dragRevertDuration'),
  					zIndex: 2 // one above the .fc-view
  				});
  				mouseFollower.hide(); // don't show until we know this is a real drag
  				mouseFollower.start(ev);
  			},
  			dragStart: function(ev) {
  				if (
  					dragListener.isTouch &&
  					!view.isEventDefSelected(eventDef) &&
  					eventInstance
  				) {
  					// if not previously selected, will fire after a delay. then, select the event
  					view.selectEventInstance(eventInstance);
  				}
  				isDragging = true;
  
  				// ensure a mouseout on the manipulated event has been reported
  				_this.eventPointing.handleMouseout(seg, ev);
  
  				_this.segDragStart(seg, ev);
  				view.hideEventsWithId(seg.footprint.eventDef.id);
  			},
  			hitOver: function(hit, isOrig, origHit) {
  				var isAllowed = true;
  				var origFootprint;
  				var footprint;
  				var mutatedEventInstanceGroup;
  
  				// starting hit could be forced (DayGrid.limit)
  				if (seg.hit) {
  					origHit = seg.hit;
  				}
  
  				// hit might not belong to this grid, so query origin grid
  				origFootprint = origHit.component.getSafeHitFootprint(origHit);
  				footprint = hit.component.getSafeHitFootprint(hit);
  
  				if (origFootprint && footprint) {
  					eventDefMutation = _this.computeEventDropMutation(origFootprint, footprint, eventDef);
  
  					if (eventDefMutation) {
  						mutatedEventInstanceGroup = eventManager.buildMutatedEventInstanceGroup(
  							eventDef.id,
  							eventDefMutation
  						);
  						isAllowed = component.isEventInstanceGroupAllowed(mutatedEventInstanceGroup);
  					}
  					else {
  						isAllowed = false;
  					}
  				}
  				else {
  					isAllowed = false;
  				}
  
  				if (!isAllowed) {
  					eventDefMutation = null;
  					disableCursor();
  				}
  
  				// if a valid drop location, have the subclass render a visual indication
  				if (
  					eventDefMutation &&
  					view.renderDrag( // truthy if rendered something
  						component.eventRangesToEventFootprints(
  							mutatedEventInstanceGroup.sliceRenderRanges(component.dateProfile.renderUnzonedRange, calendar)
  						),
  						seg,
  						dragListener.isTouch
  					)
  				) {
  					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) {
  					// needs to have moved hits to be a valid drop
  					eventDefMutation = null;
  				}
  			},
  			hitOut: function() { // called before mouse moves to a different hit OR moved out of all hits
  				view.unrenderDrag(seg); // unrender whatever was done in renderDrag
  				mouseFollower.show(); // show in case we are moving out of all hits
  				eventDefMutation = null;
  			},
  			hitDone: function() { // Called after a hitOut OR before a dragEnd
  				enableCursor();
  			},
  			interactionEnd: function(ev) {
  				delete seg.component; // prevent side effects
  
  				// do revert animation if hasn't changed. calls a callback when finished (whether animation or not)
  				mouseFollower.stop(!eventDefMutation, function() {
  					if (isDragging) {
  						view.unrenderDrag(seg);
  						_this.segDragStop(seg, ev);
  					}
  
  					view.showEventsWithId(seg.footprint.eventDef.id);
  
  					if (eventDefMutation) {
  						// no need to re-show original, will rerender all anyways. esp important if eventRenderWait
  						view.reportEventDrop(eventInstance, eventDefMutation, el, ev);
  					}
  				});
  
  				_this.dragListener = null;
  			}
  		});
  
  		return dragListener;
  	},
  
  
  	// Called before event segment dragging starts
  	segDragStart: function(seg, ev) {
  		this.isDragging = true;
  		this.component.publiclyTrigger('eventDragStart', {
  			context: seg.el[0],
  			args: [
  				seg.footprint.getEventLegacy(),
  				ev,
  				{}, // jqui dummy
  				this.view
  			]
  		});
  	},
  
  
  	// Called after event segment dragging stops
  	segDragStop: function(seg, ev) {
  		this.isDragging = false;
  		this.component.publiclyTrigger('eventDragStop', {
  			context: seg.el[0],
  			args: [
  				seg.footprint.getEventLegacy(),
  				ev,
  				{}, // jqui dummy
  				this.view
  			]
  		});
  	},
  
  
  	// DOES NOT consider overlap/constraint
  	computeEventDropMutation: function(startFootprint, endFootprint, eventDef) {
  		var eventDefMutation = new EventDefMutation();
  
  		eventDefMutation.setDateMutation(
  			this.computeEventDateMutation(startFootprint, endFootprint)
  		);
  
  		return eventDefMutation;
  	},
  
  
  	computeEventDateMutation: function(startFootprint, endFootprint) {
  		var date0 = startFootprint.unzonedRange.getStart();
  		var date1 = endFootprint.unzonedRange.getStart();
  		var clearEnd = false;
  		var forceTimed = false;
  		var forceAllDay = false;
  		var dateDelta;
  		var dateMutation;
  
  		if (startFootprint.isAllDay !== endFootprint.isAllDay) {
  			clearEnd = true;
  
  			if (endFootprint.isAllDay) {
  				forceAllDay = true;
  				date0.stripTime();
  			}
  			else {
  				forceTimed = true;
  			}
  		}
  
  		dateDelta = this.component.diffDates(date1, date0);
  
  		dateMutation = new EventDefDateMutation();
  		dateMutation.clearEnd = clearEnd;
  		dateMutation.forceTimed = forceTimed;
  		dateMutation.forceAllDay = forceAllDay;
  		dateMutation.setDateDelta(dateDelta);
  
  		return dateMutation;
  	}
  
  });
  
  ;;
  
  var EventResizing = FC.EventResizing = Interaction.extend({
  
  	eventPointing: null,
  	dragListener: null,
  	isResizing: false,
  
  
  	/*
  	component impements:
  		- bindSegHandlerToEl
  		- publiclyTrigger
  		- diffDates
  		- eventRangesToEventFootprints
  		- isEventInstanceGroupAllowed
  		- getSafeHitFootprint
  	*/
  
  
  	constructor: function(component, eventPointing) {
  		Interaction.call(this, component);
  
  		this.eventPointing = eventPointing;
  	},
  
  
  	end: function() {
  		if (this.dragListener) {
  			this.dragListener.endInteraction();
  		}
  	},
  
  
  	bindToEl: function(el) {
  		var component = this.component;
  
  		component.bindSegHandlerToEl(el, 'mousedown', this.handleMouseDown.bind(this));
  		component.bindSegHandlerToEl(el, 'touchstart', this.handleTouchStart.bind(this));
  	},
  
  
  	handleMouseDown: function(seg, ev) {
  		if (this.component.canStartResize(seg, ev)) {
  			this.buildDragListener(seg, $(ev.target).is('.fc-start-resizer'))
  				.startInteraction(ev, { distance: 5 });
  		}
  	},
  
  
  	handleTouchStart: function(seg, ev) {
  		if (this.component.canStartResize(seg, ev)) {
  			this.buildDragListener(seg, $(ev.target).is('.fc-start-resizer'))
  				.startInteraction(ev);
  		}
  	},
  
  
  	// Creates a listener that tracks the user as they resize an event segment.
  	// Generic enough to work with any type of Grid.
  	buildDragListener: function(seg, isStart) {
  		var _this = this;
  		var component = this.component;
  		var view = this.view;
  		var calendar = view.calendar;
  		var eventManager = calendar.eventManager;
  		var el = seg.el;
  		var eventDef = seg.footprint.eventDef;
  		var eventInstance = seg.footprint.eventInstance;
  		var isDragging;
  		var resizeMutation; // zoned event date properties. falsy if invalid resize
  
  		// Tracks mouse movement over the *grid's* coordinate map
  		var dragListener = this.dragListener = new HitDragListener(component, {
  			scroll: this.opt('dragScroll'),
  			subjectEl: el,
  			interactionStart: function() {
  				isDragging = false;
  			},
  			dragStart: function(ev) {
  				isDragging = true;
  
  				// ensure a mouseout on the manipulated event has been reported
  				_this.eventPointing.handleMouseout(seg, ev);
  
  				_this.segResizeStart(seg, ev);
  			},
  			hitOver: function(hit, isOrig, origHit) {
  				var isAllowed = true;
  				var origHitFootprint = component.getSafeHitFootprint(origHit);
  				var hitFootprint = component.getSafeHitFootprint(hit);
  				var mutatedEventInstanceGroup;
  
  				if (origHitFootprint && hitFootprint) {
  					resizeMutation = isStart ?
  						_this.computeEventStartResizeMutation(origHitFootprint, hitFootprint, seg.footprint) :
  						_this.computeEventEndResizeMutation(origHitFootprint, hitFootprint, seg.footprint);
  
  					if (resizeMutation) {
  						mutatedEventInstanceGroup = eventManager.buildMutatedEventInstanceGroup(
  							eventDef.id,
  							resizeMutation
  						);
  						isAllowed = component.isEventInstanceGroupAllowed(mutatedEventInstanceGroup);
  					}
  					else {
  						isAllowed = false;
  					}
  				}
  				else {
  					isAllowed = false;
  				}
  
  				if (!isAllowed) {
  					resizeMutation = null;
  					disableCursor();
  				}
  				else if (resizeMutation.isEmpty()) {
  					// no change. (FYI, event dates might have zones)
  					resizeMutation = null;
  				}
  
  				if (resizeMutation) {
  					view.hideEventsWithId(seg.footprint.eventDef.id);
  					view.renderEventResize(
  						component.eventRangesToEventFootprints(
  							mutatedEventInstanceGroup.sliceRenderRanges(component.dateProfile.renderUnzonedRange, calendar)
  						),
  						seg
  					);
  				}
  			},
  			hitOut: function() { // called before mouse moves to a different hit OR moved out of all hits
  				resizeMutation = null;
  			},
  			hitDone: function() { // resets the rendering to show the original event
  				view.unrenderEventResize(seg);
  				view.showEventsWithId(seg.footprint.eventDef.id);
  				enableCursor();
  			},
  			interactionEnd: function(ev) {
  				if (isDragging) {
  					_this.segResizeStop(seg, ev);
  				}
  
  				if (resizeMutation) { // valid date to resize to?
  					// no need to re-show original, will rerender all anyways. esp important if eventRenderWait
  					view.reportEventResize(eventInstance, resizeMutation, el, ev);
  				}
  
  				_this.dragListener = null;
  			}
  		});
  
  		return dragListener;
  	},
  
  
  	// Called before event segment resizing starts
  	segResizeStart: function(seg, ev) {
  		this.isResizing = true;
  		this.component.publiclyTrigger('eventResizeStart', {
  			context: seg.el[0],
  			args: [
  				seg.footprint.getEventLegacy(),
  				ev,
  				{}, // jqui dummy
  				this.view
  			]
  		});
  	},
  
  
  	// Called after event segment resizing stops
  	segResizeStop: function(seg, ev) {
  		this.isResizing = false;
  		this.component.publiclyTrigger('eventResizeStop', {
  			context: seg.el[0],
  			args: [
  				seg.footprint.getEventLegacy(),
  				ev,
  				{}, // jqui dummy
  				this.view
  			]
  		});
  	},
  
  
  	// Returns new date-information for an event segment being resized from its start
  	computeEventStartResizeMutation: function(startFootprint, endFootprint, origEventFootprint) {
  		var origRange = origEventFootprint.componentFootprint.unzonedRange;
  		var startDelta = this.component.diffDates(
  			endFootprint.unzonedRange.getStart(),
  			startFootprint.unzonedRange.getStart()
  		);
  		var dateMutation;
  		var eventDefMutation;
  
  		if (origRange.getStart().add(startDelta) < origRange.getEnd()) {
  
  			dateMutation = new EventDefDateMutation();
  			dateMutation.setStartDelta(startDelta);
  
  			eventDefMutation = new EventDefMutation();
  			eventDefMutation.setDateMutation(dateMutation);
  
  			return eventDefMutation;
  		}
  
  		return false;
  	},
  
  
  	// Returns new date-information for an event segment being resized from its end
  	computeEventEndResizeMutation: function(startFootprint, endFootprint, origEventFootprint) {
  		var origRange = origEventFootprint.componentFootprint.unzonedRange;
  		var endDelta = this.component.diffDates(
  			endFootprint.unzonedRange.getEnd(),
  			startFootprint.unzonedRange.getEnd()
  		);
  		var dateMutation;
  		var eventDefMutation;
  
  		if (origRange.getEnd().add(endDelta) > origRange.getStart()) {
  
  			dateMutation = new EventDefDateMutation();
  			dateMutation.setEndDelta(endDelta);
  
  			eventDefMutation = new EventDefMutation();
  			eventDefMutation.setDateMutation(dateMutation);
  
  			return eventDefMutation;
  		}
  
  		return false;
  	}
  
  });
  
  ;;
  
  var ExternalDropping = FC.ExternalDropping = Interaction.extend(ListenerMixin, {
  
  	dragListener: null,
  	isDragging: false, // jqui-dragging an external element? boolean
  
  
  	/*
  	component impements:
  		- eventRangesToEventFootprints
  		- isEventInstanceGroupAllowed
  		- isExternalInstanceGroupAllowed
  		- renderDrag
  		- unrenderDrag
  	*/
  
  
  	end: function() {
  		if (this.dragListener) {
  			this.dragListener.endInteraction();
  		}
  	},
  
  
  	bindToDocument: function() {
  		this.listenTo($(document), {
  			dragstart: this.handleDragStart, // jqui
  			sortstart: this.handleDragStart // jqui
  		});
  	},
  
  
  	unbindFromDocument: function() {
  		this.stopListeningTo($(document));
  	},
  
  
  	// Called when a jQuery UI drag is initiated anywhere in the DOM
  	handleDragStart: function(ev, ui) {
  		var el;
  		var accept;
  
  		if (this.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 = this.opt('dropAccept');
  			if ($.isFunction(accept) ? accept.call(el[0], el) : el.is(accept)) {
  				if (!this.isDragging) { // prevent double-listening if fired twice
  					this.listenToExternalDrag(el, ev, ui);
  				}
  			}
  		}
  	},
  
  
  	// Called when a jQuery UI drag starts and it needs to be monitored for dropping
  	listenToExternalDrag: function(el, ev, ui) {
  		var _this = this;
  		var component = this.component;
  		var view = this.view;
  		var meta = getDraggedElMeta(el); // extra data about event drop, including possible event to create
  		var singleEventDef; // a null value signals an unsuccessful drag
  
  		// listener that tracks mouse movement over date-associated pixel regions
  		var dragListener = _this.dragListener = new HitDragListener(component, {
  			interactionStart: function() {
  				_this.isDragging = true;
  			},
  			hitOver: function(hit) {
  				var isAllowed = true;
  				var hitFootprint = hit.component.getSafeHitFootprint(hit); // hit might not belong to this grid
  				var mutatedEventInstanceGroup;
  
  				if (hitFootprint) {
  					singleEventDef = _this.computeExternalDrop(hitFootprint, meta);
  
  					if (singleEventDef) {
  						mutatedEventInstanceGroup = new EventInstanceGroup(
  							singleEventDef.buildInstances()
  						);
  						isAllowed = meta.eventProps ? // isEvent?
  							component.isEventInstanceGroupAllowed(mutatedEventInstanceGroup) :
  							component.isExternalInstanceGroupAllowed(mutatedEventInstanceGroup);
  					}
  					else {
  						isAllowed = false;
  					}
  				}
  				else {
  					isAllowed = false;
  				}
  
  				if (!isAllowed) {
  					singleEventDef = null;
  					disableCursor();
  				}
  
  				if (singleEventDef) {
  					component.renderDrag( // called without a seg parameter
  						component.eventRangesToEventFootprints(
  							mutatedEventInstanceGroup.sliceRenderRanges(component.dateProfile.renderUnzonedRange, view.calendar)
  						)
  					);
  				}
  			},
  			hitOut: function() {
  				singleEventDef = null; // signal unsuccessful
  			},
  			hitDone: function() { // Called after a hitOut OR before a dragEnd
  				enableCursor();
  				component.unrenderDrag();
  			},
  			interactionEnd: function(ev) {
  
  				if (singleEventDef) { // element was dropped on a valid hit
  					view.reportExternalDrop(
  						singleEventDef,
  						Boolean(meta.eventProps), // isEvent
  						Boolean(meta.stick), // isSticky
  						el, ev, ui
  					);
  				}
  
  				_this.isDragging = false;
  				_this.dragListener = null;
  			}
  		});
  
  		dragListener.startDrag(ev); // start listening immediately
  	},
  
  
  	// Given a hit to be dropped upon, and misc data associated with the jqui drag (guaranteed to be a plain object),
  	// returns the zoned start/end dates for the event that would result from the hypothetical drop. end might be null.
  	// Returning a null value signals an invalid drop hit.
  	// DOES NOT consider overlap/constraint.
  	// Assumes both footprints are non-open-ended.
  	computeExternalDrop: function(componentFootprint, meta) {
  		var calendar = this.view.calendar;
  		var start = FC.moment.utc(componentFootprint.unzonedRange.startMs).stripZone();
  		var end;
  		var eventDef;
  
  		if (componentFootprint.isAllDay) {
  			// if dropped on an all-day span, and element's metadata specified a time, set it
  			if (meta.startTime) {
  				start.time(meta.startTime);
  			}
  			else {
  				start.stripTime();
  			}
  		}
  
  		if (meta.duration) {
  			end = start.clone().add(meta.duration);
  		}
  
  		start = calendar.applyTimezone(start);
  
  		if (end) {
  			end = calendar.applyTimezone(end);
  		}
  
  		eventDef = SingleEventDef.parse(
  			$.extend({}, meta.eventProps, {
  				start: start,
  				end: end
  			}),
  			new EventSource(calendar)
  		);
  
  		return eventDef;
  	}
  
  });
  
  
  /* 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 };
  }
  
  ;;
  
  var EventPointing = FC.EventPointing = Interaction.extend({
  
  	mousedOverSeg: null, // the segment object the user's mouse is over. null if over nothing
  
  
  	/*
  	component must implement:
  		- publiclyTrigger
  	*/
  
  
  	bindToEl: function(el) {
  		var component = this.component;
  
  		component.bindSegHandlerToEl(el, 'click', this.handleClick.bind(this));
  		component.bindSegHandlerToEl(el, 'mouseenter', this.handleMouseover.bind(this));
  		component.bindSegHandlerToEl(el, 'mouseleave', this.handleMouseout.bind(this));
  	},
  
  
  	handleClick: function(seg, ev) {
  		var res = this.component.publiclyTrigger('eventClick', { // can return `false` to cancel
  			context: seg.el[0],
  			args: [ seg.footprint.getEventLegacy(), ev, this.view ]
  		});
  
  		if (res === false) {
  			ev.preventDefault();
  		}
  	},
  
  
  	// Updates internal state and triggers handlers for when an event element is moused over
  	handleMouseover: function(seg, ev) {
  		if (
  			!GlobalEmitter.get().shouldIgnoreMouse() &&
  			!this.mousedOverSeg
  		) {
  			this.mousedOverSeg = seg;
  
  			// TODO: move to EventSelecting's responsibility
  			if (this.view.isEventDefResizable(seg.footprint.eventDef)) {
  				seg.el.addClass('fc-allow-mouse-resize');
  			}
  
  			this.component.publiclyTrigger('eventMouseover', {
  				context: seg.el[0],
  				args: [ seg.footprint.getEventLegacy(), ev, this.view ]
  			});
  		}
  	},
  
  
  	// 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.
  	handleMouseout: function(seg, ev) {
  		if (this.mousedOverSeg) {
  			this.mousedOverSeg = null;
  
  			// TODO: move to EventSelecting's responsibility
  			if (this.view.isEventDefResizable(seg.footprint.eventDef)) {
  				seg.el.removeClass('fc-allow-mouse-resize');
  			}
  
  			this.component.publiclyTrigger('eventMouseout', {
  				context: seg.el[0],
  				args: [
  					seg.footprint.getEventLegacy(),
  					ev || {}, // if given no arg, make a mock mouse event
  					this.view
  				]
  			});
  		}
  	},
  
  
  	end: function() {
  		if (this.mousedOverSeg) {
  			this.handleMouseout(this.mousedOverSeg);
  		}
  	}
  
  });
  
  ;;
  
  var StandardInteractionsMixin = FC.StandardInteractionsMixin = {
  	dateClickingClass: DateClicking,
  	dateSelectingClass: DateSelecting,
  	eventPointingClass: EventPointing,
  	eventDraggingClass: EventDragging,
  	eventResizingClass: EventResizing,
  	externalDroppingClass: ExternalDropping
  };
  
  ;;
  
  var EventRenderer = FC.EventRenderer = Class.extend({
  
  	view: null,
  	component: null,
  	fillRenderer: null, // might remain null
  
  	fgSegs: null,
  	bgSegs: null,
  
  	// derived from options
  	eventTimeFormat: null,
  	displayEventTime: null,
  	displayEventEnd: null,
  
  
  	constructor: function(component, fillRenderer) { // fillRenderer is optional
  		this.view = component._getView();
  		this.component = component;
  		this.fillRenderer = fillRenderer;
  	},
  
  
  	opt: function(name) {
  		return this.view.opt(name);
  	},
  
  
  	// Updates values that rely on options and also relate to range
  	rangeUpdated: function() {
  		var displayEventTime;
  		var displayEventEnd;
  
  		this.eventTimeFormat =
  			this.opt('eventTimeFormat') ||
  			this.opt('timeFormat') || // deprecated
  			this.computeEventTimeFormat();
  
  		displayEventTime = this.opt('displayEventTime');
  		if (displayEventTime == null) {
  			displayEventTime = this.computeDisplayEventTime(); // might be based off of range
  		}
  
  		displayEventEnd = this.opt('displayEventEnd');
  		if (displayEventEnd == null) {
  			displayEventEnd = this.computeDisplayEventEnd(); // might be based off of range
  		}
  
  		this.displayEventTime = displayEventTime;
  		this.displayEventEnd = displayEventEnd;
  	},
  
  
  	render: function(eventsPayload) {
  		var dateProfile = this.component._getDateProfile();
  		var eventDefId;
  		var instanceGroup;
  		var eventRanges;
  		var bgRanges = [];
  		var fgRanges = [];
  
  		for (eventDefId in eventsPayload) {
  			instanceGroup = eventsPayload[eventDefId];
  
  			eventRanges = instanceGroup.sliceRenderRanges(
  				dateProfile.activeUnzonedRange
  			);
  
  			if (instanceGroup.getEventDef().hasBgRendering()) {
  				bgRanges.push.apply(bgRanges, eventRanges);
  			}
  			else {
  				fgRanges.push.apply(fgRanges, eventRanges);
  			}
  		}
  
  		this.renderBgRanges(bgRanges);
  		this.renderFgRanges(fgRanges);
  	},
  
  
  	unrender: function() {
  		this.unrenderBgRanges();
  		this.unrenderFgRanges();
  	},
  
  
  	renderFgRanges: function(eventRanges) {
  		var eventFootprints = this.component.eventRangesToEventFootprints(eventRanges);
  		var segs = this.component.eventFootprintsToSegs(eventFootprints);
  
  		// render an `.el` on each seg
  		// returns a subset of the segs. segs that were actually rendered
  		segs = this.renderFgSegEls(segs);
  
  		if (this.renderFgSegs(segs) !== false) { // no failure?
  			this.fgSegs = segs;
  		}
  	},
  
  
  	unrenderFgRanges: function() {
  		this.unrenderFgSegs(this.fgSegs || []);
  		this.fgSegs = null;
  	},
  
  
  	renderBgRanges: function(eventRanges) {
  		var eventFootprints = this.component.eventRangesToEventFootprints(eventRanges);
  		var segs = this.component.eventFootprintsToSegs(eventFootprints);
  
  		if (this.renderBgSegs(segs) !== false) { // no failure?
  			this.bgSegs = segs;
  		}
  	},
  
  
  	unrenderBgRanges: function() {
  		this.unrenderBgSegs();
  		this.bgSegs = null;
  	},
  
  
  	getSegs: function() {
  		return (this.bgSegs || []).concat(this.fgSegs || []);
  	},
  
  
  	// Renders foreground event segments onto the grid
  	renderFgSegs: function(segs) {
  		// subclasses must implement
  		// segs already has rendered els, and has been filtered.
  
  		return false; // signal failure if not implemented
  	},
  
  
  	// Unrenders all currently rendered foreground segments
  	unrenderFgSegs: function(segs) {
  		// subclasses must implement
  	},
  
  
  	renderBgSegs: function(segs) {
  		var _this = this;
  
  		if (this.fillRenderer) {
  			this.fillRenderer.renderSegs('bgEvent', segs, {
  				getClasses: function(seg) {
  					return _this.getBgClasses(seg.footprint.eventDef);
  				},
  				getCss: function(seg) {
  					return {
  						'background-color': _this.getBgColor(seg.footprint.eventDef)
  					};
  				},
  				filterEl: function(seg, el) {
  					return _this.filterEventRenderEl(seg.footprint, el);
  				}
  			});
  		}
  		else {
  			return false; // signal failure if no fillRenderer
  		}
  	},
  
  
  	unrenderBgSegs: function() {
  		if (this.fillRenderer) {
  			this.fillRenderer.unrender('bgEvent');
  		}
  	},
  
  
  	// Renders and assigns an `el` property for each foreground event segment.
  	// Only returns segments that successfully rendered.
  	renderFgSegEls: function(segs, disableResizing) {
  		var _this = this;
  		var hasEventRenderHandlers = this.view.hasPublicHandlers('eventRender');
  		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++) {
  				this.beforeFgSegHtml(segs[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 = $(node);
  
  				if (hasEventRenderHandlers) { // optimization
  					el = _this.filterEventRenderEl(seg.footprint, el);
  				}
  
  				if (el) {
  					el.data('fc-seg', seg); // used by handlers
  					seg.el = el;
  					renderedSegs.push(seg);
  				}
  			});
  		}
  
  		return renderedSegs;
  	},
  
  
  	beforeFgSegHtml: function(seg) { // hack
  	},
  
  
  	// Generates the HTML for the default rendering of a foreground event segment. Used by renderFgSegEls()
  	fgSegHtml: function(seg, disableResizing) {
  		// subclasses should implement
  	},
  
  
  	// Generic utility for generating the HTML classNames for an event segment's element
  	getSegClasses: function(seg, isDraggable, isResizable) {
  		var classes = [
  			'fc-event',
  			seg.isStart ? 'fc-start' : 'fc-not-start',
  			seg.isEnd ? 'fc-end' : 'fc-not-end'
  		].concat(this.getClasses(seg.footprint.eventDef));
  
  		if (isDraggable) {
  			classes.push('fc-draggable');
  		}
  		if (isResizable) {
  			classes.push('fc-resizable');
  		}
  
  		// event is currently selected? attach a className.
  		if (this.view.isEventDefSelected(seg.footprint.eventDef)) {
  			classes.push('fc-selected');
  		}
  
  		return classes;
  	},
  
  
  	// 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.
  	filterEventRenderEl: function(eventFootprint, el) {
  		var legacy = eventFootprint.getEventLegacy();
  
  		var custom = this.view.publiclyTrigger('eventRender', {
  			context: legacy,
  			args: [ legacy, el, this.view ]
  		});
  
  		if (custom === false) { // means don't render at all
  			el = null;
  		}
  		else if (custom && custom !== true) {
  			el = $(custom);
  		}
  
  		return el;
  	},
  
  
  	// 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.
  	getTimeText: function(eventFootprint, formatStr, displayEnd) {
  		return this._getTimeText(
  			eventFootprint.eventInstance.dateProfile.start,
  			eventFootprint.eventInstance.dateProfile.end,
  			eventFootprint.componentFootprint.isAllDay,
  			formatStr,
  			displayEnd
  		);
  	},
  
  
  	_getTimeText: function(start, end, isAllDay, formatStr, displayEnd) {
  		if (formatStr == null) {
  			formatStr = this.eventTimeFormat;
  		}
  
  		if (displayEnd == null) {
  			displayEnd = this.displayEventEnd;
  		}
  
  		if (this.displayEventTime && !isAllDay) {
  			if (displayEnd && end) {
  				return this.view.formatRange(
  					{ start: start, end: end },
  					false, // allDay
  					formatStr
  				);
  			}
  			else {
  				return start.format(formatStr);
  			}
  		}
  
  		return '';
  	},
  
  
  	computeEventTimeFormat: function() {
  		return this.opt('smallTimeFormat');
  	},
  
  
  	computeDisplayEventTime: function() {
  		return true;
  	},
  
  
  	computeDisplayEventEnd: function() {
  		return true;
  	},
  
  
  	getBgClasses: function(eventDef) {
  		var classNames = this.getClasses(eventDef);
  		classNames.push('fc-bgevent');
  		return classNames;
  	},
  
  
  	getClasses: function(eventDef) {
  		var objs = this.getStylingObjs(eventDef);
  		var i;
  		var classNames = [];
  
  		for (i = 0; i < objs.length; i++) {
  			classNames.push.apply( // append
  				classNames,
  				objs[i].eventClassName || objs[i].className || []
  			);
  		}
  
  		return classNames;
  	},
  
  
  	// Utility for generating event skin-related CSS properties
  	getSkinCss: function(eventDef) {
  		return {
  			'background-color': this.getBgColor(eventDef),
  			'border-color': this.getBorderColor(eventDef),
  			color: this.getTextColor(eventDef)
  		};
  	},
  
  
  	// Queries for caller-specified color, then falls back to default
  	getBgColor: function(eventDef) {
  		var objs = this.getStylingObjs(eventDef);
  		var i;
  		var val;
  
  		for (i = 0; i < objs.length && !val; i++) {
  			val = objs[i].eventBackgroundColor || objs[i].eventColor ||
  				objs[i].backgroundColor || objs[i].color;
  		}
  
  		if (!val) {
  			val = this.opt('eventBackgroundColor') || this.opt('eventColor');
  		}
  
  		return val;
  	},
  
  
  	// Queries for caller-specified color, then falls back to default
  	getBorderColor: function(eventDef) {
  		var objs = this.getStylingObjs(eventDef);
  		var i;
  		var val;
  
  		for (i = 0; i < objs.length && !val; i++) {
  			val = objs[i].eventBorderColor || objs[i].eventColor ||
  				objs[i].borderColor || objs[i].color;
  		}
  
  		if (!val) {
  			val = this.opt('eventBorderColor') || this.opt('eventColor');
  		}
  
  		return val;
  	},
  
  
  	// Queries for caller-specified color, then falls back to default
  	getTextColor: function(eventDef) {
  		var objs = this.getStylingObjs(eventDef);
  		var i;
  		var val;
  
  		for (i = 0; i < objs.length && !val; i++) {
  			val = objs[i].eventTextColor ||
  				objs[i].textColor;
  		}
  
  		if (!val) {
  			val = this.opt('eventTextColor');
  		}
  
  		return val;
  	},
  
  
  	getStylingObjs: function(eventDef) {
  		var objs = this.getFallbackStylingObjs(eventDef);
  		objs.unshift(eventDef);
  		return objs;
  	},
  
  
  	getFallbackStylingObjs: function(eventDef) {
  		return [ eventDef.source ];
  	},
  
  
  	sortEventSegs: function(segs) {
  		segs.sort(proxy(this, 'compareEventSegs'));
  	},
  
  
  	// A cmp function for determining which segments should take visual priority
  	compareEventSegs: function(seg1, seg2) {
  		var f1 = seg1.footprint.componentFootprint;
  		var r1 = f1.unzonedRange;
  		var f2 = seg2.footprint.componentFootprint;
  		var r2 = f2.unzonedRange;
  
  		return r1.startMs - r2.startMs || // earlier events go first
  			(r2.endMs - r2.startMs) - (r1.endMs - r1.startMs) || // tie? longer events go first
  			f2.isAllDay - f1.isAllDay || // tie? put all-day events first (booleans cast to 0/1)
  			compareByFieldSpecs(
  				seg1.footprint.eventDef,
  				seg2.footprint.eventDef,
  				this.view.eventOrderSpecs
  			);
  	}
  
  });
  
  ;;
  
  var BusinessHourRenderer = FC.BusinessHourRenderer = Class.extend({
  
  	component: null,
  	fillRenderer: null,
  	segs: null,
  
  
  	/*
  	component implements:
  		- eventRangesToEventFootprints
  		- eventFootprintsToSegs
  	*/
  	constructor: function(component, fillRenderer) {
  		this.component = component;
  		this.fillRenderer = fillRenderer;
  	},
  
  
  	render: function(businessHourGenerator) {
  		var component = this.component;
  		var unzonedRange = component._getDateProfile().activeUnzonedRange;
  
  		var eventInstanceGroup = businessHourGenerator.buildEventInstanceGroup(
  			component.hasAllDayBusinessHours,
  			unzonedRange
  		);
  
  		var eventFootprints = eventInstanceGroup ?
  			component.eventRangesToEventFootprints(
  				eventInstanceGroup.sliceRenderRanges(unzonedRange)
  			) :
  			[];
  
  		this.renderEventFootprints(eventFootprints);
  	},
  
  
  	renderEventFootprints: function(eventFootprints) {
  		var segs = this.component.eventFootprintsToSegs(eventFootprints);
  
  		this.renderSegs(segs);
  		this.segs = segs;
  	},
  
  
  	renderSegs: function(segs) {
  		if (this.fillRenderer) {
  			this.fillRenderer.renderSegs('businessHours', segs, {
  				getClasses: function(seg) {
  					return [ 'fc-nonbusiness', 'fc-bgevent' ];
  				}
  			});
  		}
  	},
  
  
  	unrender: function() {
  		if (this.fillRenderer) {
  			this.fillRenderer.unrender('businessHours');
  		}
  
  		this.segs = null;
  	},
  
  
  	getSegs: function() {
  		return this.segs || [];
  	}
  
  });
  
  ;;
  
  var FillRenderer = FC.FillRenderer = Class.extend({ // use for highlight, background events, business hours
  
  	fillSegTag: 'div',
  	component: null,
  	elsByFill: null, // a hash of jQuery element sets used for rendering each fill. Keyed by fill name.
  
  
  	constructor: function(component) {
  		this.component = component;
  		this.elsByFill = {};
  	},
  
  
  	renderFootprint: function(type, componentFootprint, props) {
  		this.renderSegs(
  			type,
  			this.component.componentFootprintToSegs(componentFootprint),
  			props
  		);
  	},
  
  
  	renderSegs: function(type, segs, props) {
  		var els;
  
  		segs = this.buildSegEls(type, segs, props); // assignes `.el` to each seg. returns successfully rendered segs
  		els = this.attachSegEls(type, segs);
  
  		if (els) {
  			this.reportEls(type, els);
  		}
  
  		return segs;
  	},
  
  
  	// Unrenders a specific type of fill that is currently rendered on the grid
  	unrender: 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.
  	buildSegEls: function(type, segs, props) {
  		var _this = this;
  		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.buildSegHtml(type, segs[i], props);
  			}
  
  			// 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 (props.filterEl) {
  					el = props.filterEl(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;
  	},
  
  
  	// Builds the HTML needed for one fill segment. Generic enough to work with different types.
  	buildSegHtml: function(type, seg, props) {
  		// custom hooks per-type
  		var classes = props.getClasses ? props.getClasses(seg) : [];
  		var css = cssToStr(props.getCss ? props.getCss(seg) : {});
  
  		return '<' + this.fillSegTag +
  			(classes.length ? ' class="' + classes.join(' ') + '"' : '') +
  			(css ? ' style="' + css + '"' : '') +
  			' />';
  	},
  
  
  	// Should return wrapping DOM structure
  	attachSegEls: function(type, segs) {
  		// subclasses must implement
  	},
  
  
  	reportEls: function(type, nodes) {
  		if (this.elsByFill[type]) {
  			this.elsByFill[type] = this.elsByFill[type].add(nodes);
  		}
  		else {
  			this.elsByFill[type] = $(nodes);
  		}
  	}
  
  });
  
  ;;
  
  var HelperRenderer = FC.HelperRenderer = Class.extend({
  
  	view: null,
  	component: null,
  	eventRenderer: null,
  	helperEls: null,
  
  
  	constructor: function(component, eventRenderer) {
  		this.view = component._getView();
  		this.component = component;
  		this.eventRenderer = eventRenderer;
  	},
  
  
  	renderComponentFootprint: function(componentFootprint) {
  		this.renderEventFootprints([
  			this.fabricateEventFootprint(componentFootprint)
  		]);
  	},
  
  
  	renderEventDraggingFootprints: function(eventFootprints, sourceSeg, isTouch) {
  		this.renderEventFootprints(
  			eventFootprints,
  			sourceSeg,
  			'fc-dragging',
  			isTouch ? null : this.view.opt('dragOpacity')
  		);
  	},
  
  
  	renderEventResizingFootprints: function(eventFootprints, sourceSeg, isTouch) {
  		this.renderEventFootprints(
  			eventFootprints,
  			sourceSeg,
  			'fc-resizing'
  		);
  	},
  
  
  	renderEventFootprints: function(eventFootprints, sourceSeg, extraClassNames, opacity) {
  		var segs = this.component.eventFootprintsToSegs(eventFootprints);
  		var classNames = 'fc-helper ' + (extraClassNames || '');
  		var i;
  
  		// assigns each seg's el and returns a subset of segs that were rendered
  		segs = this.eventRenderer.renderFgSegEls(segs);
  
  		for (i = 0; i < segs.length; i++) {
  			segs[i].el.addClass(classNames);
  		}
  
  		if (opacity != null) {
  			for (i = 0; i < segs.length; i++) {
  				segs[i].el.css('opacity', opacity);
  			}
  		}
  
  		this.helperEls = this.renderSegs(segs, sourceSeg);
  	},
  
  
  	/*
  	Must return all mock event elements
  	*/
  	renderSegs: function(segs, sourceSeg) {
  		// Subclasses must implement
  	},
  
  
  	unrender: function() {
  		if (this.helperEls) {
  			this.helperEls.remove();
  			this.helperEls = null;
  		}
  	},
  
  
  	fabricateEventFootprint: function(componentFootprint) {
  		var calendar = this.view.calendar;
  		var eventDateProfile = calendar.footprintToDateProfile(componentFootprint);
  		var dummyEvent = new SingleEventDef(new EventSource(calendar));
  		var dummyInstance;
  
  		dummyEvent.dateProfile = eventDateProfile;
  		dummyInstance = dummyEvent.buildInstance();
  
  		return new EventFootprint(componentFootprint, dummyEvent, dummyInstance);
  	}
  
  });
  
  ;;
  
  var Component = Model.extend({
  
  	el: null,
  
  
  	setElement: function(el) {
  		this.el = el;
  		this.bindGlobalHandlers();
  		this.renderSkeleton();
  		this.set('isInDom', true);
  	},
  
  
  	removeElement: function() {
  		this.unset('isInDom');
  		this.unrenderSkeleton();
  		this.unbindGlobalHandlers();
  
  		this.el.remove();
  		// NOTE: don't null-out this.el in case the View was destroyed within an API callback.
  		// We don't null-out the View's other jQuery element references upon destroy,
  		//  so we shouldn't kill this.el either.
  	},
  
  
  	bindGlobalHandlers: function() {
  	},
  
  
  	unbindGlobalHandlers: function() {
  	},
  
  
  	/*
  	NOTE: Can't have a `render` method. Read the deprecation notice in View::executeDateRender
  	*/
  
  
  	// 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
  	}
  
  });
  
  ;;
  
  var DateComponent = FC.DateComponent = Component.extend({
  
  	uid: null,
  	childrenByUid: null,
  	isRTL: false, // frequently accessed options
  	nextDayThreshold: null, // "
  	dateProfile: null, // hack
  
  	eventRendererClass: null,
  	helperRendererClass: null,
  	businessHourRendererClass: null,
  	fillRendererClass: null,
  
  	eventRenderer: null,
  	helperRenderer: null,
  	businessHourRenderer: null,
  	fillRenderer: null,
  
  	hitsNeededDepth: 0, // necessary because multiple callers might need the same hits
  
  	hasAllDayBusinessHours: false, // TODO: unify with largeUnit and isTimeScale?
  
  	isDatesRendered: false,
  
  
  	constructor: function() {
  		Component.call(this);
  
  		this.uid = String(DateComponent.guid++);
  		this.childrenByUid = {};
  
  		this.nextDayThreshold = moment.duration(this.opt('nextDayThreshold'));
  		this.isRTL = this.opt('isRTL');
  
  		if (this.fillRendererClass) {
  			this.fillRenderer = new this.fillRendererClass(this);
  		}
  
  		if (this.eventRendererClass) { // fillRenderer is optional -----v
  			this.eventRenderer = new this.eventRendererClass(this, this.fillRenderer);
  		}
  
  		if (this.helperRendererClass && this.eventRenderer) {
  			this.helperRenderer = new this.helperRendererClass(this, this.eventRenderer);
  		}
  
  		if (this.businessHourRendererClass && this.fillRenderer) {
  			this.businessHourRenderer = new this.businessHourRendererClass(this, this.fillRenderer);
  		}
  	},
  
  
  	addChild: function(child) {
  		if (!this.childrenByUid[child.uid]) {
  			this.childrenByUid[child.uid] = child;
  
  			return true;
  		}
  
  		return false;
  	},
  
  
  	removeChild: function(child) {
  		if (this.childrenByUid[child.uid]) {
  			delete this.childrenByUid[child.uid];
  
  			return true;
  		}
  
  		return false;
  	},
  
  
  	// TODO: only do if isInDom?
  	// TODO: make part of Component, along with children/batch-render system?
  	updateSize: function(totalHeight, isAuto, isResize) {
  		this.callChildren('updateSize', arguments);
  	},
  
  
  	// Options
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	opt: function(name) {
  		return this._getView().opt(name); // default implementation
  	},
  
  
  	publiclyTrigger: function(/**/) {
  		var calendar = this._getCalendar();
  
  		return calendar.publiclyTrigger.apply(calendar, arguments);
  	},
  
  
  	hasPublicHandlers: function(/**/) {
  		var calendar = this._getCalendar();
  
  		return calendar.hasPublicHandlers.apply(calendar, arguments);
  	},
  
  
  	// Date
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	executeDateRender: function(dateProfile) {
  		this.dateProfile = dateProfile; // for rendering
  		this.renderDates(dateProfile);
  		this.isDatesRendered = true;
  		this.callChildren('executeDateRender', arguments);
  	},
  
  
  	executeDateUnrender: function() { // wrapper
  		this.callChildren('executeDateUnrender', arguments);
  		this.dateProfile = null;
  		this.unrenderDates();
  		this.isDatesRendered = false;
  	},
  
  
  	// date-cell content only
  	renderDates: function(dateProfile) {
  		// subclasses should implement
  	},
  
  
  	// date-cell content only
  	unrenderDates: function() {
  		// subclasses should override
  	},
  
  
  	// Now-Indicator
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	// Returns a string unit, like 'second' or 'minute' that defined how often the current time indicator
  	// should be refreshed. If something falsy is returned, no time indicator is rendered at all.
  	getNowIndicatorUnit: function() {
  		// subclasses should implement
  	},
  
  
  	// Renders a current time indicator at the given datetime
  	renderNowIndicator: function(date) {
  		this.callChildren('renderNowIndicator', arguments);
  	},
  
  
  	// Undoes the rendering actions from renderNowIndicator
  	unrenderNowIndicator: function() {
  		this.callChildren('unrenderNowIndicator', arguments);
  	},
  
  
  	// Business Hours
  	// ---------------------------------------------------------------------------------------------------------------
  
  
  	renderBusinessHours: function(businessHourGenerator) {
  		if (this.businessHourRenderer) {
  			this.businessHourRenderer.render(businessHourGenerator);
  		}
  
  		this.callChildren('renderBusinessHours', arguments);
  	},
  
  
  	// Unrenders previously-rendered business-hours
  	unrenderBusinessHours: function() {
  		this.callChildren('unrenderBusinessHours', arguments);
  
  		if (this.businessHourRenderer) {
  			this.businessHourRenderer.unrender();
  		}
  	},
  
  
  	// Event Displaying
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	executeEventRender: function(eventsPayload) {
  		if (this.eventRenderer) {
  			this.eventRenderer.rangeUpdated(); // poorly named now
  			this.eventRenderer.render(eventsPayload);
  		}
  		else if (this.renderEvents) { // legacy
  			this.renderEvents(convertEventsPayloadToLegacyArray(eventsPayload));
  		}
  
  		this.callChildren('executeEventRender', arguments);
  	},
  
  
  	executeEventUnrender: function() {
  		this.callChildren('executeEventUnrender', arguments);
  
  		if (this.eventRenderer) {
  			this.eventRenderer.unrender();
  		}
  		else if (this.destroyEvents) { // legacy
  			this.destroyEvents();
  		}
  	},
  
  
  	getBusinessHourSegs: function() { // recursive
  		var segs = this.getOwnBusinessHourSegs();
  
  		this.iterChildren(function(child) {
  			segs.push.apply(segs, child.getBusinessHourSegs());
  		});
  
  		return segs;
  	},
  
  
  	getOwnBusinessHourSegs: function() {
  		if (this.businessHourRenderer) {
  			return this.businessHourRenderer.getSegs();
  		}
  
  		return [];
  	},
  
  
  	getEventSegs: function() { // recursive
  		var segs = this.getOwnEventSegs();
  
  		this.iterChildren(function(child) {
  			segs.push.apply(segs, child.getEventSegs());
  		});
  
  		return segs;
  	},
  
  
  	getOwnEventSegs: function() { // just for itself
  		if (this.eventRenderer) {
  			return this.eventRenderer.getSegs();
  		}
  
  		return [];
  	},
  
  
  	// Event Rendering Triggering
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	triggerAfterEventsRendered: function() {
  		this.triggerAfterEventSegsRendered(
  			this.getEventSegs()
  		);
  
  		this.publiclyTrigger('eventAfterAllRender', {
  			context: this,
  			args: [ this ]
  		});
  	},
  
  
  	triggerAfterEventSegsRendered: function(segs) {
  		var _this = this;
  
  		// an optimization, because getEventLegacy is expensive
  		if (this.hasPublicHandlers('eventAfterRender')) {
  			segs.forEach(function(seg) {
  				var legacy;
  
  				if (seg.el) { // necessary?
  					legacy = seg.footprint.getEventLegacy();
  
  					_this.publiclyTrigger('eventAfterRender', {
  						context: legacy,
  						args: [ legacy, seg.el, _this ]
  					});
  				}
  			});
  		}
  	},
  
  
  	triggerBeforeEventsDestroyed: function() {
  		this.triggerBeforeEventSegsDestroyed(
  			this.getEventSegs()
  		);
  	},
  
  
  	triggerBeforeEventSegsDestroyed: function(segs) {
  		var _this = this;
  
  		if (this.hasPublicHandlers('eventDestroy')) {
  			segs.forEach(function(seg) {
  				var legacy;
  
  				if (seg.el) { // necessary?
  					legacy = seg.footprint.getEventLegacy();
  
  					_this.publiclyTrigger('eventDestroy', {
  						context: legacy,
  						args: [ legacy, seg.el, _this ]
  					});
  				}
  			});
  		}
  	},
  
  
  	// Event Rendering Utils
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	// Hides all rendered event segments linked to the given event
  	// RECURSIVE with subcomponents
  	showEventsWithId: function(eventDefId) {
  
  		this.getEventSegs().forEach(function(seg) {
  			if (
  				seg.footprint.eventDef.id === eventDefId &&
  				seg.el // necessary?
  			) {
  				seg.el.css('visibility', '');
  			}
  		});
  
  		this.callChildren('showEventsWithId', arguments);
  	},
  
  
  	// Shows all rendered event segments linked to the given event
  	// RECURSIVE with subcomponents
  	hideEventsWithId: function(eventDefId) {
  
  		this.getEventSegs().forEach(function(seg) {
  			if (
  				seg.footprint.eventDef.id === eventDefId &&
  				seg.el // necessary?
  			) {
  				seg.el.css('visibility', 'hidden');
  			}
  		});
  
  		this.callChildren('hideEventsWithId', arguments);
  	},
  
  
  	// Drag-n-Drop Rendering (for both events and external elements)
  	// ---------------------------------------------------------------------------------------------------------------
  
  
  	// Renders a visual indication of a event or external-element drag over the given drop zone.
  	// If an external-element, seg will be `null`.
  	// Must return elements used for any mock events.
  	renderDrag: function(eventFootprints, seg, isTouch) {
  		var renderedHelper = false;
  
  		this.iterChildren(function(child) {
  			if (child.renderDrag(eventFootprints, seg, isTouch)) {
  				renderedHelper = true;
  			}
  		});
  
  		return renderedHelper;
  	},
  
  
  	// Unrenders a visual indication of an event or external-element being dragged.
  	unrenderDrag: function() {
  		this.callChildren('unrenderDrag', arguments);
  	},
  
  
  	// Event Resizing
  	// ---------------------------------------------------------------------------------------------------------------
  
  
  	// Renders a visual indication of an event being resized.
  	renderEventResize: function(eventFootprints, seg, isTouch) {
  		this.callChildren('renderEventResize', arguments);
  	},
  
  
  	// Unrenders a visual indication of an event being resized.
  	unrenderEventResize: function() {
  		this.callChildren('unrenderEventResize', arguments);
  	},
  
  
  	// Selection
  	// ---------------------------------------------------------------------------------------------------------------
  
  
  	// Renders a visual indication of the selection
  	// TODO: rename to `renderSelection` after legacy is gone
  	renderSelectionFootprint: function(componentFootprint) {
  		this.renderHighlight(componentFootprint);
  
  		this.callChildren('renderSelectionFootprint', arguments);
  	},
  
  
  	// Unrenders a visual indication of selection
  	unrenderSelection: function() {
  		this.unrenderHighlight();
  
  		this.callChildren('unrenderSelection', arguments);
  	},
  
  
  	// Highlight
  	// ---------------------------------------------------------------------------------------------------------------
  
  
  	// Renders an emphasis on the given date range. Given a span (unzoned start/end and other misc data)
  	renderHighlight: function(componentFootprint) {
  		if (this.fillRenderer) {
  			this.fillRenderer.renderFootprint(
  				'highlight',
  				componentFootprint,
  				{
  					getClasses: function() {
  						return [ 'fc-highlight' ];
  					}
  				}
  			);
  		}
  
  		this.callChildren('renderHighlight', arguments);
  	},
  
  
  	// Unrenders the emphasis on a date range
  	unrenderHighlight: function() {
  		if (this.fillRenderer) {
  			this.fillRenderer.unrender('highlight');
  		}
  
  		this.callChildren('unrenderHighlight', arguments);
  	},
  
  
  	// Hit Areas
  	// ---------------------------------------------------------------------------------------------------------------
  	// just because all DateComponents support this interface
  	// doesn't mean they need to have their own internal coord system. they can defer to sub-components.
  
  
  	hitsNeeded: function() {
  		if (!(this.hitsNeededDepth++)) {
  			this.prepareHits();
  		}
  
  		this.callChildren('hitsNeeded', arguments);
  	},
  
  
  	hitsNotNeeded: function() {
  		if (this.hitsNeededDepth && !(--this.hitsNeededDepth)) {
  			this.releaseHits();
  		}
  
  		this.callChildren('hitsNotNeeded', arguments);
  	},
  
  
  	prepareHits: function() {
  		// subclasses can implement
  	},
  
  
  	releaseHits: function() {
  		// subclasses can implement
  	},
  
  
  	// Given coordinates from the topleft of the document, return data about the date-related area underneath.
  	// Can return an object with arbitrary properties (although top/right/left/bottom are encouraged).
  	// Must have a `grid` property, a reference to this current grid. TODO: avoid this
  	// The returned object will be processed by getHitFootprint and getHitEl.
  	queryHit: function(leftOffset, topOffset) {
  		var childrenByUid = this.childrenByUid;
  		var uid;
  		var hit;
  
  		for (uid in childrenByUid) {
  			hit = childrenByUid[uid].queryHit(leftOffset, topOffset);
  
  			if (hit) {
  				break;
  			}
  		}
  
  		return hit;
  	},
  
  
  	getSafeHitFootprint: function(hit) {
  		var footprint = this.getHitFootprint(hit);
  
  		if (!this.dateProfile.activeUnzonedRange.containsRange(footprint.unzonedRange)) {
  			return null;
  		}
  
  		return footprint;
  	},
  
  
  	getHitFootprint: function(hit) {
  	},
  
  
  	// Given position-level information about a date-related area within the grid,
  	// should return a jQuery element that best represents it. passed to dayClick callback.
  	getHitEl: function(hit) {
  	},
  
  
  	/* Converting eventRange -> eventFootprint
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	eventRangesToEventFootprints: function(eventRanges) {
  		var eventFootprints = [];
  		var i;
  
  		for (i = 0; i < eventRanges.length; i++) {
  			eventFootprints.push.apply( // append
  				eventFootprints,
  				this.eventRangeToEventFootprints(eventRanges[i])
  			);
  		}
  
  		return eventFootprints;
  	},
  
  
  	eventRangeToEventFootprints: function(eventRange) {
  		return [ eventRangeToEventFootprint(eventRange) ];
  	},
  
  
  	/* Converting componentFootprint/eventFootprint -> segs
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	eventFootprintsToSegs: function(eventFootprints) {
  		var segs = [];
  		var i;
  
  		for (i = 0; i < eventFootprints.length; i++) {
  			segs.push.apply(segs,
  				this.eventFootprintToSegs(eventFootprints[i])
  			);
  		}
  
  		return segs;
  	},
  
  
  	// Given an event's span (unzoned start/end and other misc data), and the event itself,
  	// slices into segments and attaches event-derived properties to them.
  	// eventSpan - { start, end, isStart, isEnd, otherthings... }
  	eventFootprintToSegs: function(eventFootprint) {
  		var unzonedRange = eventFootprint.componentFootprint.unzonedRange;
  		var segs;
  		var i, seg;
  
  		segs = this.componentFootprintToSegs(eventFootprint.componentFootprint);
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  
  			if (!unzonedRange.isStart) {
  				seg.isStart = false;
  			}
  			if (!unzonedRange.isEnd) {
  				seg.isEnd = false;
  			}
  
  			seg.footprint = eventFootprint;
  			// TODO: rename to seg.eventFootprint
  		}
  
  		return segs;
  	},
  
  
  	componentFootprintToSegs: function(componentFootprint) {
  		return [];
  	},
  
  
  	// Utils
  	// ---------------------------------------------------------------------------------------------------------------
  
  
  	callChildren: function(methodName, args) {
  		this.iterChildren(function(child) {
  			child[methodName].apply(child, args);
  		});
  	},
  
  
  	iterChildren: function(func) {
  		var childrenByUid = this.childrenByUid;
  		var uid;
  
  		for (uid in childrenByUid) {
  			func(childrenByUid[uid]);
  		}
  	},
  
  
  	_getCalendar: function() { // TODO: strip out. move to generic parent.
  		return this.calendar || this.view.calendar;
  	},
  
  
  	_getView: function() { // TODO: strip out. move to generic parent.
  		return this.view;
  	},
  
  
  	_getDateProfile: function() {
  		return this._getView().get('dateProfile');
  	}
  
  });
  
  
  DateComponent.guid = 0; // TODO: better system for this?
  
  
  // legacy
  
  function convertEventsPayloadToLegacyArray(eventsPayload) {
  	var eventDefId;
  	var eventInstances;
  	var legacyEvents = [];
  	var i;
  
  	for (eventDefId in eventsPayload) {
  		eventInstances = eventsPayload[eventDefId].eventInstances;
  
  		for (i = 0; i < eventInstances.length; i++) {
  			legacyEvents.push(
  				eventInstances[i].toLegacy()
  			);
  		}
  	}
  
  	return legacyEvents;
  }
  
  ;;
  
  DateComponent.mixin({
  
  	// Generates HTML for an anchor to another view into the calendar.
  	// Will either generate an <a> tag or a non-clickable <span> tag, depending on enabled settings.
  	// `gotoOptions` can either be a moment input, or an object with the form:
  	// { date, type, forceOff }
  	// `type` is a view-type like "day" or "week". default value is "day".
  	// `attrs` and `innerHtml` are use to generate the rest of the HTML tag.
  	buildGotoAnchorHtml: function(gotoOptions, attrs, innerHtml) {
  		var date, type, forceOff;
  		var finalOptions;
  
  		if ($.isPlainObject(gotoOptions)) {
  			date = gotoOptions.date;
  			type = gotoOptions.type;
  			forceOff = gotoOptions.forceOff;
  		}
  		else {
  			date = gotoOptions; // a single moment input
  		}
  		date = FC.moment(date); // if a string, parse it
  
  		finalOptions = { // for serialization into the link
  			date: date.format('YYYY-MM-DD'),
  			type: type || 'day'
  		};
  
  		if (typeof attrs === 'string') {
  			innerHtml = attrs;
  			attrs = null;
  		}
  
  		attrs = attrs ? ' ' + attrsToStr(attrs) : ''; // will have a leading space
  		innerHtml = innerHtml || '';
  
  		if (!forceOff && this.opt('navLinks')) {
  			return '<a' + attrs +
  				' data-goto="' + htmlEscape(JSON.stringify(finalOptions)) + '">' +
  				innerHtml +
  				'</a>';
  		}
  		else {
  			return '<span' + attrs + '>' +
  				innerHtml +
  				'</span>';
  		}
  	},
  
  
  	getAllDayHtml: function() {
  		return this.opt('allDayHtml') || htmlEscape(this.opt('allDayText'));
  	},
  
  
  	// Computes HTML classNames for a single-day element
  	getDayClasses: function(date, noThemeHighlight) {
  		var view = this._getView();
  		var classes = [];
  		var today;
  
  		if (!this.dateProfile.activeUnzonedRange.containsDate(date)) {
  			classes.push('fc-disabled-day'); // TODO: jQuery UI theme?
  		}
  		else {
  			classes.push('fc-' + dayIDs[date.day()]);
  
  			if (view.isDateInOtherMonth(date, this.dateProfile)) { // TODO: use DateComponent subclass somehow
  				classes.push('fc-other-month');
  			}
  
  			today = view.calendar.getNow();
  
  			if (date.isSame(today, 'day')) {
  				classes.push('fc-today');
  
  				if (noThemeHighlight !== true) {
  					classes.push(view.calendar.theme.getClass('today'));
  				}
  			}
  			else if (date < today) {
  				classes.push('fc-past');
  			}
  			else {
  				classes.push('fc-future');
  			}
  		}
  
  		return classes;
  	},
  
  
  	// Utility for formatting a range. Accepts a range object, formatting string, and optional separator.
  	// Displays all-day ranges naturally, with an inclusive end. Takes the current isRTL into account.
  	// The timezones of the dates within `range` will be respected.
  	formatRange: function(range, isAllDay, formatStr, separator) {
  		var end = range.end;
  
  		if (isAllDay) {
  			end = end.clone().subtract(1); // convert to inclusive. last ms of previous day
  		}
  
  		return formatRange(range.start, end, formatStr, separator, this.isRTL);
  	},
  
  
  	// Compute the number of the give units in the "current" range.
  	// Will return a floating-point number. Won't round.
  	currentRangeAs: function(unit) {
  		return this._getDateProfile().currentUnzonedRange.as(unit);
  	},
  
  
  	// Returns the date range of the full days the given range visually appears to occupy.
  	// Returns a plain object with start/end, NOT an UnzonedRange!
  	computeDayRange: function(unzonedRange) {
  		var calendar = this._getCalendar();
  		var startDay = calendar.msToUtcMoment(unzonedRange.startMs, true); // the beginning of the day the range starts
  		var end = calendar.msToUtcMoment(unzonedRange.endMs);
  		var endTimeMS = +end.time(); // # of milliseconds into `endDay`
  		var endDay = end.clone().stripTime(); // the beginning of the day the range exclusively ends
  
  		// 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 end is within `startDay` but not past nextDayThreshold, assign the default duration of one day.
  		if (endDay <= startDay) {
  			endDay = startDay.clone().add(1, 'days');
  		}
  
  		return { start: startDay, end: endDay };
  	},
  
  
  	// Does the given range visually appear to occupy more than one day?
  	isMultiDayRange: function(unzonedRange) {
  		var dayRange = this.computeDayRange(unzonedRange);
  
  		return dayRange.end.diff(dayRange.start, 'days') > 1;
  	}
  
  });
  
  ;;
  
  var InteractiveDateComponent = FC.InteractiveDateComponent = DateComponent.extend({
  
  	dateClickingClass: null,
  	dateSelectingClass: null,
  	eventPointingClass: null,
  	eventDraggingClass: null,
  	eventResizingClass: null,
  	externalDroppingClass: null,
  
  	dateClicking: null,
  	dateSelecting: null,
  	eventPointing: null,
  	eventDragging: null,
  	eventResizing: null,
  	externalDropping: null,
  
  	// self-config, overridable by subclasses
  	segSelector: '.fc-event-container > *', // what constitutes an event element?
  
  	// if defined, holds the unit identified (ex: "year" or "month") that determines the level of granularity
  	// of the date areas. if not defined, assumes to be day and time granularity.
  	// TODO: port isTimeScale into same system?
  	largeUnit: null,
  
  
  	constructor: function() {
  		DateComponent.call(this);
  
  		if (this.dateSelectingClass) {
  			this.dateClicking = new this.dateClickingClass(this);
  		}
  
  		if (this.dateSelectingClass) {
  			this.dateSelecting = new this.dateSelectingClass(this);
  		}
  
  		if (this.eventPointingClass) {
  			this.eventPointing = new this.eventPointingClass(this);
  		}
  
  		if (this.eventDraggingClass && this.eventPointing) {
  			this.eventDragging = new this.eventDraggingClass(this, this.eventPointing);
  		}
  
  		if (this.eventResizingClass && this.eventPointing) {
  			this.eventResizing = new this.eventResizingClass(this, this.eventPointing);
  		}
  
  		if (this.externalDroppingClass) {
  			this.externalDropping = new this.externalDroppingClass(this);
  		}
  	},
  
  
  	// Sets the container element that the view should render inside of, does global DOM-related initializations,
  	// and renders all the non-date-related content inside.
  	setElement: function(el) {
  		DateComponent.prototype.setElement.apply(this, arguments);
  
  		if (this.dateClicking) {
  			this.dateClicking.bindToEl(el);
  		}
  
  		if (this.dateSelecting) {
  			this.dateSelecting.bindToEl(el);
  		}
  
  		this.bindAllSegHandlersToEl(el);
  	},
  
  
  	unrender: function() {
  		this.endInteractions();
  
  		DateComponent.prototype.unrender.apply(this, arguments);
  	},
  
  
  	executeEventUnrender: function() {
  		this.endInteractions();
  
  		DateComponent.prototype.executeEventUnrender.apply(this, arguments);
  	},
  
  
  	bindGlobalHandlers: function() {
  		DateComponent.prototype.bindGlobalHandlers.apply(this, arguments);
  
  		if (this.externalDropping) {
  			this.externalDropping.bindToDocument();
  		}
  	},
  
  
  	unbindGlobalHandlers: function() {
  		DateComponent.prototype.unbindGlobalHandlers.apply(this, arguments);
  
  		if (this.externalDropping) {
  			this.externalDropping.unbindFromDocument();
  		}
  	},
  
  
  	bindDateHandlerToEl: function(el, name, handler) {
  		var _this = this;
  
  		// attach a handler to the grid's root element.
  		// jQuery will take care of unregistering them when removeElement gets called.
  		this.el.on(name, function(ev) {
  			if (
  				!$(ev.target).is(
  					_this.segSelector + ',' + // directly on an event element
  					_this.segSelector + ' *,' + // within an event element
  					'.fc-more,' + // a "more.." link
  					'a[data-goto]' // a clickable nav link
  				)
  			) {
  				return handler.call(_this, ev);
  			}
  		});
  	},
  
  
  	bindAllSegHandlersToEl: function(el) {
  		[
  			this.eventPointing,
  			this.eventDragging,
  			this.eventResizing
  		].forEach(function(eventInteraction) {
  			if (eventInteraction) {
  				eventInteraction.bindToEl(el);
  			}
  		});
  	},
  
  
  	bindSegHandlerToEl: function(el, name, handler) {
  		var _this = this;
  
  		el.on(name, this.segSelector, function(ev) {
  			var seg = $(this).data('fc-seg'); // grab segment data. put there by View::renderEventsPayload
  
  			if (seg && !_this.shouldIgnoreEventPointing()) {
  				return handler.call(_this, seg, ev); // context will be the Grid
  			}
  		});
  	},
  
  
  	shouldIgnoreMouse: function() {
  		// HACK
  		// This will still work even though bindDateHandlerToEl doesn't use GlobalEmitter.
  		return GlobalEmitter.get().shouldIgnoreMouse();
  	},
  
  
  	shouldIgnoreTouch: function() {
  		var view = this._getView();
  
  		// On iOS (and Android?) when a new selection is initiated overtop another selection,
  		// the touchend never fires because the elements gets removed mid-touch-interaction (my theory).
  		// HACK: simply don't allow this to happen.
  		// ALSO: prevent selection when an *event* is already raised.
  		return view.isSelected || view.selectedEvent;
  	},
  
  
  	shouldIgnoreEventPointing: function() {
  		// only call the handlers if there is not a drag/resize in progress
  		return (this.eventDragging && this.eventDragging.isDragging) ||
  			(this.eventResizing && this.eventResizing.isResizing);
  	},
  
  
  	canStartSelection: function(seg, ev) {
  		return getEvIsTouch(ev) &&
  			!this.canStartResize(seg, ev) &&
  			(this.isEventDefDraggable(seg.footprint.eventDef) ||
  			 this.isEventDefResizable(seg.footprint.eventDef));
  	},
  
  
  	canStartDrag: function(seg, ev) {
  		return !this.canStartResize(seg, ev) &&
  			this.isEventDefDraggable(seg.footprint.eventDef);
  	},
  
  
  	canStartResize: function(seg, ev) {
  		var view = this._getView();
  		var eventDef = seg.footprint.eventDef;
  
  		return (!getEvIsTouch(ev) || view.isEventDefSelected(eventDef)) &&
  			this.isEventDefResizable(eventDef) &&
  			$(ev.target).is('.fc-resizer');
  	},
  
  
  	// Kills all in-progress dragging.
  	// Useful for when public API methods that result in re-rendering are invoked during a drag.
  	// Also useful for when touch devices misbehave and don't fire their touchend.
  	endInteractions: function() {
  		[
  			this.dateClicking,
  			this.dateSelecting,
  			this.eventPointing,
  			this.eventDragging,
  			this.eventResizing
  		].forEach(function(interaction) {
  			if (interaction) {
  				interaction.end();
  			}
  		});
  	},
  
  
  	// Event Drag-n-Drop
  	// ---------------------------------------------------------------------------------------------------------------
  
  
  	// Computes if the given event is allowed to be dragged by the user
  	isEventDefDraggable: function(eventDef) {
  		return this.isEventDefStartEditable(eventDef);
  	},
  
  
  	isEventDefStartEditable: function(eventDef) {
  		var isEditable = eventDef.isStartExplicitlyEditable();
  
  		if (isEditable == null) {
  			isEditable = this.opt('eventStartEditable');
  
  			if (isEditable == null) {
  				isEditable = this.isEventDefGenerallyEditable(eventDef);
  			}
  		}
  
  		return isEditable;
  	},
  
  
  	isEventDefGenerallyEditable: function(eventDef) {
  		var isEditable = eventDef.isExplicitlyEditable();
  
  		if (isEditable == null) {
  			isEditable = this.opt('editable');
  		}
  
  		return isEditable;
  	},
  
  
  	// Event Resizing
  	// ---------------------------------------------------------------------------------------------------------------
  
  
  	// Computes if the given event is allowed to be resized from its starting edge
  	isEventDefResizableFromStart: function(eventDef) {
  		return this.opt('eventResizableFromStart') && this.isEventDefResizable(eventDef);
  	},
  
  
  	// Computes if the given event is allowed to be resized from its ending edge
  	isEventDefResizableFromEnd: function(eventDef) {
  		return this.isEventDefResizable(eventDef);
  	},
  
  
  	// Computes if the given event is allowed to be resized by the user at all
  	isEventDefResizable: function(eventDef) {
  		var isResizable = eventDef.isDurationExplicitlyEditable();
  
  		if (isResizable == null) {
  			isResizable = this.opt('eventDurationEditable');
  
  			if (isResizable == null) {
  				isResizable = this.isEventDefGenerallyEditable(eventDef);
  			}
  		}
  		return isResizable;
  	},
  
  
  	// Event Mutation / Constraints
  	// ---------------------------------------------------------------------------------------------------------------
  
  
  	// Diffs the two dates, returning a duration, based on granularity of the grid
  	// TODO: port isTimeScale into this system?
  	diffDates: function(a, b) {
  		if (this.largeUnit) {
  			return diffByUnit(a, b, this.largeUnit);
  		}
  		else {
  			return diffDayTime(a, b);
  		}
  	},
  
  
  	// is it allowed, in relation to the view's validRange?
  	// NOTE: very similar to isExternalInstanceGroupAllowed
  	isEventInstanceGroupAllowed: function(eventInstanceGroup) {
  		var view = this._getView();
  		var dateProfile = this.dateProfile;
  		var eventFootprints = this.eventRangesToEventFootprints(eventInstanceGroup.getAllEventRanges());
  		var i;
  
  		for (i = 0; i < eventFootprints.length; i++) {
  			// TODO: just use getAllEventRanges directly
  			if (!dateProfile.validUnzonedRange.containsRange(eventFootprints[i].componentFootprint.unzonedRange)) {
  				return false;
  			}
  		}
  
  		return view.calendar.isEventInstanceGroupAllowed(eventInstanceGroup);
  	},
  
  
  	// NOTE: very similar to isEventInstanceGroupAllowed
  	// when it's a completely anonymous external drag, no event.
  	isExternalInstanceGroupAllowed: function(eventInstanceGroup) {
  		var view = this._getView();
  		var dateProfile = this.dateProfile;
  		var eventFootprints = this.eventRangesToEventFootprints(eventInstanceGroup.getAllEventRanges());
  		var i;
  
  		for (i = 0; i < eventFootprints.length; i++) {
  			if (!dateProfile.validUnzonedRange.containsRange(eventFootprints[i].componentFootprint.unzonedRange)) {
  				return false;
  			}
  		}
  
  		for (i = 0; i < eventFootprints.length; i++) {
  			// treat it as a selection
  			// TODO: pass in eventInstanceGroup instead
  			//  because we don't want calendar's constraint system to depend on a component's
  			//  determination of footprints.
  			if (!view.calendar.isSelectionFootprintAllowed(eventFootprints[i].componentFootprint)) {
  				return false;
  			}
  		}
  
  		return true;
  	}
  
  });
  
  ;;
  
  /*
  A set of rendering and date-related methods for a visual component comprised of one or more rows of day columns.
  Prerequisite: the object being mixed into needs to be a *Grid*
  */
  var DayTableMixin = FC.DayTableMixin = {
  
  	breakOnWeeks: false, // should create a new row for each week?
  	dayDates: null, // whole-day dates for each column. left to right
  	dayIndices: null, // for each day from start, the offset
  	daysPerRow: null,
  	rowCnt: null,
  	colCnt: null,
  	colHeadFormat: null,
  
  
  	// Populates internal variables used for date calculation and rendering
  	updateDayTable: function() {
  		var view = this.view;
  		var calendar = view.calendar;
  		var date = calendar.msToUtcMoment(this.dateProfile.renderUnzonedRange.startMs, true);
  		var end = calendar.msToUtcMoment(this.dateProfile.renderUnzonedRange.endMs, true);
  		var dayIndex = -1;
  		var dayIndices = [];
  		var dayDates = [];
  		var daysPerRow;
  		var firstDay;
  		var rowCnt;
  
  		while (date.isBefore(end)) { // loop each day from start to end
  			if (view.isHiddenDay(date)) {
  				dayIndices.push(dayIndex + 0.5); // mark that it's between indices
  			}
  			else {
  				dayIndex++;
  				dayIndices.push(dayIndex);
  				dayDates.push(date.clone());
  			}
  			date.add(1, 'days');
  		}
  
  		if (this.breakOnWeeks) {
  			// count columns until the day-of-week repeats
  			firstDay = dayDates[0].day();
  			for (daysPerRow = 1; daysPerRow < dayDates.length; daysPerRow++) {
  				if (dayDates[daysPerRow].day() == firstDay) {
  					break;
  				}
  			}
  			rowCnt = Math.ceil(dayDates.length / daysPerRow);
  		}
  		else {
  			rowCnt = 1;
  			daysPerRow = dayDates.length;
  		}
  
  		this.dayDates = dayDates;
  		this.dayIndices = dayIndices;
  		this.daysPerRow = daysPerRow;
  		this.rowCnt = rowCnt;
  
  		this.updateDayTableCols();
  	},
  
  
  	// Computes and assigned the colCnt property and updates any options that may be computed from it
  	updateDayTableCols: function() {
  		this.colCnt = this.computeColCnt();
  		this.colHeadFormat = this.opt('columnFormat') || this.computeColHeadFormat();
  	},
  
  
  	// Determines how many columns there should be in the table
  	computeColCnt: function() {
  		return this.daysPerRow;
  	},
  
  
  	// Computes the ambiguously-timed moment for the given cell
  	getCellDate: function(row, col) {
  		return this.dayDates[
  				this.getCellDayIndex(row, col)
  			].clone();
  	},
  
  
  	// Computes the ambiguously-timed date range for the given cell
  	getCellRange: function(row, col) {
  		var start = this.getCellDate(row, col);
  		var end = start.clone().add(1, 'days');
  
  		return { start: start, end: end };
  	},
  
  
  	// Returns the number of day cells, chronologically, from the first of the grid (0-based)
  	getCellDayIndex: function(row, col) {
  		return row * this.daysPerRow + this.getColDayIndex(col);
  	},
  
  
  	// Returns the numner of day cells, chronologically, from the first cell in *any given row*
  	getColDayIndex: function(col) {
  		if (this.isRTL) {
  			return this.colCnt - 1 - col;
  		}
  		else {
  			return col;
  		}
  	},
  
  
  	// Given a date, returns its chronolocial cell-index from the first cell of the grid.
  	// If the date lies between cells (because of hiddenDays), returns a floating-point value between offsets.
  	// If before the first offset, returns a negative number.
  	// If after the last offset, returns an offset past the last cell offset.
  	// Only works for *start* dates of cells. Will not work for exclusive end dates for cells.
  	getDateDayIndex: function(date) {
  		var dayIndices = this.dayIndices;
  		var dayOffset = date.diff(this.dayDates[0], 'days');
  
  		if (dayOffset < 0) {
  			return dayIndices[0] - 1;
  		}
  		else if (dayOffset >= dayIndices.length) {
  			return dayIndices[dayIndices.length - 1] + 1;
  		}
  		else {
  			return dayIndices[dayOffset];
  		}
  	},
  
  
  	/* Options
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Computes a default column header formatting string if `colFormat` is not explicitly defined
  	computeColHeadFormat: function() {
  		// if more than one week row, or if there are a lot of columns with not much space,
  		// put just the day numbers will be in each cell
  		if (this.rowCnt > 1 || this.colCnt > 10) {
  			return 'ddd'; // "Sat"
  		}
  		// multiple days, so full single date string WON'T be in title text
  		else if (this.colCnt > 1) {
  			return this.opt('dayOfMonthFormat'); // "Sat 12/10"
  		}
  		// single day, so full single date string will probably be in title text
  		else {
  			return 'dddd'; // "Saturday"
  		}
  	},
  
  
  	/* Slicing
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Slices up a date range into a segment for every week-row it intersects with
  	sliceRangeByRow: function(unzonedRange) {
  		var daysPerRow = this.daysPerRow;
  		var normalRange = this.view.computeDayRange(unzonedRange); // make whole-day range, considering nextDayThreshold
  		var rangeFirst = this.getDateDayIndex(normalRange.start); // inclusive first index
  		var rangeLast = this.getDateDayIndex(normalRange.end.clone().subtract(1, 'days')); // inclusive last index
  		var segs = [];
  		var row;
  		var rowFirst, rowLast; // inclusive day-index range for current row
  		var segFirst, segLast; // inclusive day-index range for segment
  
  		for (row = 0; row < this.rowCnt; row++) {
  			rowFirst = row * daysPerRow;
  			rowLast = rowFirst + daysPerRow - 1;
  
  			// intersect segment's offset range with the row's
  			segFirst = Math.max(rangeFirst, rowFirst);
  			segLast = Math.min(rangeLast, rowLast);
  
  			// deal with in-between indices
  			segFirst = Math.ceil(segFirst); // in-between starts round to next cell
  			segLast = Math.floor(segLast); // in-between ends round to prev cell
  
  			if (segFirst <= segLast) { // was there any intersection with the current row?
  				segs.push({
  					row: row,
  
  					// normalize to start of row
  					firstRowDayIndex: segFirst - rowFirst,
  					lastRowDayIndex: segLast - rowFirst,
  
  					// must be matching integers to be the segment's start/end
  					isStart: segFirst === rangeFirst,
  					isEnd: segLast === rangeLast
  				});
  			}
  		}
  
  		return segs;
  	},
  
  
  	// Slices up a date range into a segment for every day-cell it intersects with.
  	// TODO: make more DRY with sliceRangeByRow somehow.
  	sliceRangeByDay: function(unzonedRange) {
  		var daysPerRow = this.daysPerRow;
  		var normalRange = this.view.computeDayRange(unzonedRange); // make whole-day range, considering nextDayThreshold
  		var rangeFirst = this.getDateDayIndex(normalRange.start); // inclusive first index
  		var rangeLast = this.getDateDayIndex(normalRange.end.clone().subtract(1, 'days')); // inclusive last index
  		var segs = [];
  		var row;
  		var rowFirst, rowLast; // inclusive day-index range for current row
  		var i;
  		var segFirst, segLast; // inclusive day-index range for segment
  
  		for (row = 0; row < this.rowCnt; row++) {
  			rowFirst = row * daysPerRow;
  			rowLast = rowFirst + daysPerRow - 1;
  
  			for (i = rowFirst; i <= rowLast; i++) {
  
  				// intersect segment's offset range with the row's
  				segFirst = Math.max(rangeFirst, i);
  				segLast = Math.min(rangeLast, i);
  
  				// deal with in-between indices
  				segFirst = Math.ceil(segFirst); // in-between starts round to next cell
  				segLast = Math.floor(segLast); // in-between ends round to prev cell
  
  				if (segFirst <= segLast) { // was there any intersection with the current row?
  					segs.push({
  						row: row,
  
  						// normalize to start of row
  						firstRowDayIndex: segFirst - rowFirst,
  						lastRowDayIndex: segLast - rowFirst,
  
  						// must be matching integers to be the segment's start/end
  						isStart: segFirst === rangeFirst,
  						isEnd: segLast === rangeLast
  					});
  				}
  			}
  		}
  
  		return segs;
  	},
  
  
  	/* Header Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	renderHeadHtml: function() {
  		var theme = this.view.calendar.theme;
  
  		return '' +
  			'<div class="fc-row ' + theme.getClass('headerRow') + '">' +
  				'<table class="' + theme.getClass('tableGrid') + '">' +
  					'<thead>' +
  						this.renderHeadTrHtml() +
  					'</thead>' +
  				'</table>' +
  			'</div>';
  	},
  
  
  	renderHeadIntroHtml: function() {
  		return this.renderIntroHtml(); // fall back to generic
  	},
  
  
  	renderHeadTrHtml: function() {
  		return '' +
  			'<tr>' +
  				(this.isRTL ? '' : this.renderHeadIntroHtml()) +
  				this.renderHeadDateCellsHtml() +
  				(this.isRTL ? this.renderHeadIntroHtml() : '') +
  			'</tr>';
  	},
  
  
  	renderHeadDateCellsHtml: function() {
  		var htmls = [];
  		var col, date;
  
  		for (col = 0; col < this.colCnt; col++) {
  			date = this.getCellDate(0, col);
  			htmls.push(this.renderHeadDateCellHtml(date));
  		}
  
  		return htmls.join('');
  	},
  
  
  	// TODO: when internalApiVersion, accept an object for HTML attributes
  	// (colspan should be no different)
  	renderHeadDateCellHtml: function(date, colspan, otherAttrs) {
  		var view = this.view;
  		var isDateValid = this.dateProfile.activeUnzonedRange.containsDate(date); // TODO: called too frequently. cache somehow.
  		var classNames = [
  			'fc-day-header',
  			view.calendar.theme.getClass('widgetHeader')
  		];
  		var innerHtml = htmlEscape(date.format(this.colHeadFormat));
  
  		// if only one row of days, the classNames on the header can represent the specific days beneath
  		if (this.rowCnt === 1) {
  			classNames = classNames.concat(
  				// includes the day-of-week class
  				// noThemeHighlight=true (don't highlight the header)
  				this.getDayClasses(date, true)
  			);
  		}
  		else {
  			classNames.push('fc-' + dayIDs[date.day()]); // only add the day-of-week class
  		}
  
  		return '' +
              '<th class="' + classNames.join(' ') + '"' +
  				((isDateValid && this.rowCnt) === 1 ?
  					' data-date="' + date.format('YYYY-MM-DD') + '"' :
  					'') +
  				(colspan > 1 ?
  					' colspan="' + colspan + '"' :
  					'') +
  				(otherAttrs ?
  					' ' + otherAttrs :
  					'') +
  				'>' +
  				(isDateValid ?
  					// don't make a link if the heading could represent multiple days, or if there's only one day (forceOff)
  					view.buildGotoAnchorHtml(
  						{ date: date, forceOff: this.rowCnt > 1 || this.colCnt === 1 },
  						innerHtml
  					) :
  					// if not valid, display text, but no link
  					innerHtml
  				) +
  			'</th>';
  	},
  
  
  	/* Background Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	renderBgTrHtml: function(row) {
  		return '' +
  			'<tr>' +
  				(this.isRTL ? '' : this.renderBgIntroHtml(row)) +
  				this.renderBgCellsHtml(row) +
  				(this.isRTL ? this.renderBgIntroHtml(row) : '') +
  			'</tr>';
  	},
  
  
  	renderBgIntroHtml: function(row) {
  		return this.renderIntroHtml(); // fall back to generic
  	},
  
  
  	renderBgCellsHtml: function(row) {
  		var htmls = [];
  		var col, date;
  
  		for (col = 0; col < this.colCnt; col++) {
  			date = this.getCellDate(row, col);
  			htmls.push(this.renderBgCellHtml(date));
  		}
  
  		return htmls.join('');
  	},
  
  
  	renderBgCellHtml: function(date, otherAttrs) {
  		var view = this.view;
  		var isDateValid = this.dateProfile.activeUnzonedRange.containsDate(date); // TODO: called too frequently. cache somehow.
  		var classes = this.getDayClasses(date);
  
  		classes.unshift('fc-day', view.calendar.theme.getClass('widgetContent'));
  
  		return '<td class="' + classes.join(' ') + '"' +
  			(isDateValid ?
  				' data-date="' + date.format('YYYY-MM-DD') + '"' : // if date has a time, won't format it
  				'') +
  			(otherAttrs ?
  				' ' + otherAttrs :
  				'') +
  			'></td>';
  	},
  
  
  	/* Generic
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Generates the default HTML intro for any row. User classes should override
  	renderIntroHtml: function() {
  	},
  
  
  	// TODO: a generic method for dealing with <tr>, RTL, intro
  	// when increment internalApiVersion
  	// wrapTr (scheduler)
  
  
  	/* Utils
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Applies the generic "intro" and "outro" HTML to the given cells.
  	// Intro means the leftmost cell when the calendar is LTR and the rightmost cell when RTL. Vice-versa for outro.
  	bookendCells: function(trEl) {
  		var introHtml = this.renderIntroHtml();
  
  		if (introHtml) {
  			if (this.isRTL) {
  				trEl.append(introHtml);
  			}
  			else {
  				trEl.prepend(introHtml);
  			}
  		}
  	}
  
  };
  
  ;;
  
  /* An abstract class from which other views inherit from
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var View = FC.View = InteractiveDateComponent.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
  	viewSpec: null,
  	options: null, // hash containing all options. already merged with view-specific-options
  
  	renderQueue: null,
  	batchRenderDepth: 0,
  	queuedScroll: null,
  
  	isSelected: false, // boolean whether a range of time is user-selected or not
  	selectedEventInstance: null,
  
  	eventOrderSpecs: null, // criteria for ordering events when they have same date/time
  
  	// for date utils, computed from options
  	isHiddenDayHash: null,
  
  	// now indicator
  	isNowIndicatorRendered: null,
  	initialNowDate: null, // result first getNow call
  	initialNowQueriedMs: null, // ms time the getNow was called
  	nowIndicatorTimeoutID: null, // for refresh timing of now indicator
  	nowIndicatorIntervalID: null, // "
  
  	constructor: function(calendar, viewSpec) {
  		this.calendar = calendar;
  		this.viewSpec = viewSpec;
  
  		// shortcuts
  		this.type = viewSpec.type;
  		this.options = viewSpec.options;
  
  		// .name is deprecated
  		this.name = this.type;
  
  		InteractiveDateComponent.call(this);
  
  		this.initRenderQueue();
  		this.initHiddenDays();
  		this.bindBaseRenderHandlers();
  		this.eventOrderSpecs = parseFieldSpecs(this.opt('eventOrder'));
  
  		// legacy
  		if (this.initialize) {
  			this.initialize();
  		}
  	},
  
  
  	_getView: function() {
  		return this;
  	},
  
  
  	// Retrieves an option with the given name
  	opt: function(name) {
  		return this.options[name];
  	},
  
  
  	/* Render Queue
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	initRenderQueue: function() {
  		this.renderQueue = new RenderQueue({
  			event: this.opt('eventRenderWait')
  		});
  
  		this.renderQueue.on('start', this.onRenderQueueStart.bind(this));
  		this.renderQueue.on('stop', this.onRenderQueueStop.bind(this));
  
  		this.on('before:change', this.startBatchRender);
  		this.on('change', this.stopBatchRender);
  	},
  
  
  	onRenderQueueStart: function() {
  		this.calendar.freezeContentHeight();
  		this.addScroll(this.queryScroll());
  	},
  
  
  	onRenderQueueStop: function() {
  		if (this.calendar.updateViewSize()) { // success?
  			this.popScroll();
  		}
  		this.calendar.thawContentHeight();
  	},
  
  
  	startBatchRender: function() {
  		if (!(this.batchRenderDepth++)) {
  			this.renderQueue.pause();
  		}
  	},
  
  
  	stopBatchRender: function() {
  		if (!(--this.batchRenderDepth)) {
  			this.renderQueue.resume();
  		}
  	},
  
  
  	requestRender: function(func, namespace, actionType) {
  		this.renderQueue.queue(func, namespace, actionType);
  	},
  
  
  	// given func will auto-bind to `this`
  	whenSizeUpdated: function(func) {
  		if (this.renderQueue.isRunning) {
  			this.renderQueue.one('stop', func.bind(this));
  		}
  		else {
  			func.call(this);
  		}
  	},
  
  
  	/* Title and Date Formatting
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Computes what the title at the top of the calendar should be for this view
  	computeTitle: function(dateProfile) {
  		var unzonedRange;
  
  		// for views that span a large unit of time, show the proper interval, ignoring stray days before and after
  		if (/^(year|month)$/.test(dateProfile.currentRangeUnit)) {
  			unzonedRange = dateProfile.currentUnzonedRange;
  		}
  		else { // for day units or smaller, use the actual day range
  			unzonedRange = dateProfile.activeUnzonedRange;
  		}
  
  		return this.formatRange(
  			{
  				start: this.calendar.msToMoment(unzonedRange.startMs, dateProfile.isRangeAllDay),
  				end: this.calendar.msToMoment(unzonedRange.endMs, dateProfile.isRangeAllDay)
  			},
  			dateProfile.isRangeAllDay,
  			this.opt('titleFormat') || this.computeTitleFormat(dateProfile),
  			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(dateProfile) {
  		var currentRangeUnit = dateProfile.currentRangeUnit;
  
  		if (currentRangeUnit == 'year') {
  			return 'YYYY';
  		}
  		else if (currentRangeUnit == 'month') {
  			return this.opt('monthYearFormat'); // like "September 2014"
  		}
  		else if (dateProfile.currentUnzonedRange.as('days') > 1) {
  			return 'll'; // multi-day range. shorter, like "Sep 9 - 10 2014"
  		}
  		else {
  			return 'LL'; // one day. longer, like "September 9 2014"
  		}
  	},
  
  
  	// Date Setting/Unsetting
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	setDate: function(date) {
  		var currentDateProfile = this.get('dateProfile');
  		var newDateProfile = this.buildDateProfile(date, null, true); // forceToValid=true
  
  		if (
  			!currentDateProfile ||
  			!currentDateProfile.activeUnzonedRange.equals(newDateProfile.activeUnzonedRange)
  		) {
  			this.set('dateProfile', newDateProfile);
  		}
  	},
  
  
  	unsetDate: function() {
  		this.unset('dateProfile');
  	},
  
  
  	// Event Data
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	fetchInitialEvents: function(dateProfile) {
  		var calendar = this.calendar;
  		var forceAllDay = dateProfile.isRangeAllDay && !this.usesMinMaxTime;
  
  		return calendar.requestEvents(
  			calendar.msToMoment(dateProfile.activeUnzonedRange.startMs, forceAllDay),
  			calendar.msToMoment(dateProfile.activeUnzonedRange.endMs, forceAllDay)
  		);
  	},
  
  
  	bindEventChanges: function() {
  		this.listenTo(this.calendar, 'eventsReset', this.resetEvents); // TODO: make this a real event
  	},
  
  
  	unbindEventChanges: function() {
  		this.stopListeningTo(this.calendar, 'eventsReset');
  	},
  
  
  	setEvents: function(eventsPayload) {
  		this.set('currentEvents', eventsPayload);
  		this.set('hasEvents', true);
  	},
  
  
  	unsetEvents: function() {
  		this.unset('currentEvents');
  		this.unset('hasEvents');
  	},
  
  
  	resetEvents: function(eventsPayload) {
  		this.startBatchRender();
  		this.unsetEvents();
  		this.setEvents(eventsPayload);
  		this.stopBatchRender();
  	},
  
  
  	// Date High-level Rendering
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	requestDateRender: function(dateProfile) {
  		var _this = this;
  
  		this.requestRender(function() {
  			_this.executeDateRender(dateProfile);
  		}, 'date', 'init');
  	},
  
  
  	requestDateUnrender: function() {
  		var _this = this;
  
  		this.requestRender(function() {
  			_this.executeDateUnrender();
  		}, 'date', 'destroy');
  	},
  
  
  	// if dateProfile not specified, uses current
  	executeDateRender: function(dateProfile) {
  		DateComponent.prototype.executeDateRender.apply(this, arguments);
  
  		if (this.render) {
  			this.render(); // TODO: deprecate
  		}
  
  		this.trigger('datesRendered');
  		this.addScroll({ isDateInit: true });
  		this.startNowIndicator(); // shouldn't render yet because updateSize will be called soon
  	},
  
  
  	executeDateUnrender: function() {
  		this.unselect();
  		this.stopNowIndicator();
  		this.trigger('before:datesUnrendered');
  
  		if (this.destroy) {
  			this.destroy(); // TODO: deprecate
  		}
  
  		DateComponent.prototype.executeDateUnrender.apply(this, arguments);
  	},
  
  
  	// "Base" rendering
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	bindBaseRenderHandlers: function() {
  		var _this = this;
  
  		this.on('datesRendered', function() {
  			_this.whenSizeUpdated(
  				_this.triggerViewRender
  			);
  		});
  
  		this.on('before:datesUnrendered', function() {
  			_this.triggerViewDestroy();
  		});
  	},
  
  
  	triggerViewRender: function() {
  		this.publiclyTrigger('viewRender', {
  			context: this,
  			args: [ this, this.el ]
  		});
  	},
  
  
  	triggerViewDestroy: function() {
  		this.publiclyTrigger('viewDestroy', {
  			context: this,
  			args: [ this, this.el ]
  		});
  	},
  
  
  	// Event High-level Rendering
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	requestEventsRender: function(eventsPayload) {
  		var _this = this;
  
  		this.requestRender(function() {
  			_this.executeEventRender(eventsPayload);
  			_this.whenSizeUpdated(
  				_this.triggerAfterEventsRendered
  			);
  		}, 'event', 'init');
  	},
  
  
  	requestEventsUnrender: function() {
  		var _this = this;
  
  		this.requestRender(function() {
  			_this.triggerBeforeEventsDestroyed();
  			_this.executeEventUnrender();
  		}, 'event', 'destroy');
  	},
  
  
  	// Business Hour High-level Rendering
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	requestBusinessHoursRender: function(businessHourGenerator) {
  		var _this = this;
  
  		this.requestRender(function() {
  			_this.renderBusinessHours(businessHourGenerator);
  		}, 'businessHours', 'init');
  	},
  
  	requestBusinessHoursUnrender: function() {
  		var _this = this;
  
  		this.requestRender(function() {
  			_this.unrenderBusinessHours();
  		}, 'businessHours', 'destroy');
  	},
  
  
  	// Misc view rendering utils
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	// Binds DOM handlers to elements that reside outside the view container, such as the document
  	bindGlobalHandlers: function() {
  		InteractiveDateComponent.prototype.bindGlobalHandlers.apply(this, arguments);
  
  		this.listenTo(GlobalEmitter.get(), {
  			touchstart: this.processUnselect,
  			mousedown: this.handleDocumentMousedown
  		});
  	},
  
  
  	// Unbinds DOM handlers from elements that reside outside the view container
  	unbindGlobalHandlers: function() {
  		InteractiveDateComponent.prototype.unbindGlobalHandlers.apply(this, arguments);
  
  		this.stopListeningTo(GlobalEmitter.get());
  	},
  
  
  	/* Now Indicator
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Immediately render the current time indicator and begins re-rendering it at an interval,
  	// which is defined by this.getNowIndicatorUnit().
  	// TODO: somehow do this for the current whole day's background too
  	startNowIndicator: function() {
  		var _this = this;
  		var unit;
  		var update;
  		var delay; // ms wait value
  
  		if (this.opt('nowIndicator')) {
  			unit = this.getNowIndicatorUnit();
  			if (unit) {
  				update = proxy(this, 'updateNowIndicator'); // bind to `this`
  
  				this.initialNowDate = this.calendar.getNow();
  				this.initialNowQueriedMs = +new Date();
  
  				// wait until the beginning of the next interval
  				delay = this.initialNowDate.clone().startOf(unit).add(1, unit) - this.initialNowDate;
  				this.nowIndicatorTimeoutID = setTimeout(function() {
  					_this.nowIndicatorTimeoutID = null;
  					update();
  					delay = +moment.duration(1, unit);
  					delay = Math.max(100, delay); // prevent too frequent
  					_this.nowIndicatorIntervalID = setInterval(update, delay); // update every interval
  				}, delay);
  			}
  
  			// rendering will be initiated in updateSize
  		}
  	},
  
  
  	// rerenders the now indicator, computing the new current time from the amount of time that has passed
  	// since the initial getNow call.
  	updateNowIndicator: function() {
  		if (
  			this.isDatesRendered &&
  			this.initialNowDate // activated before?
  		) {
  			this.unrenderNowIndicator(); // won't unrender if unnecessary
  			this.renderNowIndicator(
  				this.initialNowDate.clone().add(new Date() - this.initialNowQueriedMs) // add ms
  			);
  			this.isNowIndicatorRendered = true;
  		}
  	},
  
  
  	// Immediately unrenders the view's current time indicator and stops any re-rendering timers.
  	// Won't cause side effects if indicator isn't rendered.
  	stopNowIndicator: function() {
  		if (this.isNowIndicatorRendered) {
  
  			if (this.nowIndicatorTimeoutID) {
  				clearTimeout(this.nowIndicatorTimeoutID);
  				this.nowIndicatorTimeoutID = null;
  			}
  			if (this.nowIndicatorIntervalID) {
  				clearTimeout(this.nowIndicatorIntervalID);
  				this.nowIndicatorIntervalID = null;
  			}
  
  			this.unrenderNowIndicator();
  			this.isNowIndicatorRendered = false;
  		}
  	},
  
  
  	/* Dimensions
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	updateSize: function(totalHeight, isAuto, isResize) {
  
  		if (this.setHeight) { // for legacy API
  			this.setHeight(totalHeight, isAuto);
  		}
  		else {
  			InteractiveDateComponent.prototype.updateSize.apply(this, arguments);
  		}
  
  		this.updateNowIndicator();
  	},
  
  
  	/* Scroller
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	addScroll: function(scroll) {
  		var queuedScroll = this.queuedScroll || (this.queuedScroll = {});
  
  		$.extend(queuedScroll, scroll);
  	},
  
  
  	popScroll: function() {
  		this.applyQueuedScroll();
  		this.queuedScroll = null;
  	},
  
  
  	applyQueuedScroll: function() {
  		if (this.queuedScroll) {
  			this.applyScroll(this.queuedScroll);
  		}
  	},
  
  
  	queryScroll: function() {
  		var scroll = {};
  
  		if (this.isDatesRendered) {
  			$.extend(scroll, this.queryDateScroll());
  		}
  
  		return scroll;
  	},
  
  
  	applyScroll: function(scroll) {
  		if (scroll.isDateInit && this.isDatesRendered) {
  			$.extend(scroll, this.computeInitialDateScroll());
  		}
  
  		if (this.isDatesRendered) {
  			this.applyDateScroll(scroll);
  		}
  	},
  
  
  	computeInitialDateScroll: function() {
  		return {}; // subclasses must implement
  	},
  
  
  	queryDateScroll: function() {
  		return {}; // subclasses must implement
  	},
  
  
  	applyDateScroll: function(scroll) {
  		; // subclasses must implement
  	},
  
  
  	/* Event Drag-n-Drop
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	reportEventDrop: function(eventInstance, eventMutation, el, ev) {
  		var eventManager = this.calendar.eventManager;
  		var undoFunc = eventManager.mutateEventsWithId(
  			eventInstance.def.id,
  			eventMutation,
  			this.calendar
  		);
  		var dateMutation = eventMutation.dateMutation;
  
  		// update the EventInstance, for handlers
  		if (dateMutation) {
  			eventInstance.dateProfile = dateMutation.buildNewDateProfile(
  				eventInstance.dateProfile,
  				this.calendar
  			);
  		}
  
  		this.triggerEventDrop(
  			eventInstance,
  			// a drop doesn't necessarily mean a date mutation (ex: resource change)
  			(dateMutation && dateMutation.dateDelta) || moment.duration(),
  			undoFunc,
  			el, ev
  		);
  	},
  
  
  	// Triggers event-drop handlers that have subscribed via the API
  	triggerEventDrop: function(eventInstance, dateDelta, undoFunc, el, ev) {
  		this.publiclyTrigger('eventDrop', {
  			context: el[0],
  			args: [
  				eventInstance.toLegacy(),
  				dateDelta,
  				undoFunc,
  				ev,
  				{}, // {} = jqui dummy
  				this
  			]
  		});
  	},
  
  
  	/* External Element Drag-n-Drop
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Must be called when an external element, via jQuery UI, has been dropped onto the calendar.
  	// `meta` is the parsed data that has been embedded into the dragging event.
  	// `dropLocation` is an object that contains the new zoned start/end/allDay values for the event.
  	reportExternalDrop: function(singleEventDef, isEvent, isSticky, el, ev, ui) {
  
  		if (isEvent) {
  			this.calendar.eventManager.addEventDef(singleEventDef, isSticky);
  		}
  
  		this.triggerExternalDrop(singleEventDef, isEvent, el, ev, ui);
  	},
  
  
  	// Triggers external-drop handlers that have subscribed via the API
  	triggerExternalDrop: function(singleEventDef, isEvent, el, ev, ui) {
  
  		// trigger 'drop' regardless of whether element represents an event
  		this.publiclyTrigger('drop', {
  			context: el[0],
  			args: [
  				singleEventDef.dateProfile.start.clone(),
  				ev,
  				ui,
  				this
  			]
  		});
  
  		if (isEvent) {
  			// signal an external event landed
  			this.publiclyTrigger('eventReceive', {
  				context: this,
  				args: [
  					singleEventDef.buildInstance().toLegacy(),
  					this
  				]
  			});
  		}
  	},
  
  
  	/* Event Resizing
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Must be called when an event in the view has been resized to a new length
  	reportEventResize: function(eventInstance, eventMutation, el, ev) {
  		var eventManager = this.calendar.eventManager;
  		var undoFunc = eventManager.mutateEventsWithId(
  			eventInstance.def.id,
  			eventMutation,
  			this.calendar
  		);
  
  		// update the EventInstance, for handlers
  		eventInstance.dateProfile = eventMutation.dateMutation.buildNewDateProfile(
  			eventInstance.dateProfile,
  			this.calendar
  		);
  
  		this.triggerEventResize(
  			eventInstance,
  			eventMutation.dateMutation.endDelta,
  			undoFunc,
  			el, ev
  		);
  	},
  
  
  	// Triggers event-resize handlers that have subscribed via the API
  	triggerEventResize: function(eventInstance, durationDelta, undoFunc, el, ev) {
  		this.publiclyTrigger('eventResize', {
  			context: el[0],
  			args: [
  				eventInstance.toLegacy(),
  				durationDelta,
  				undoFunc,
  				ev,
  				{}, // {} = jqui dummy
  				this
  			]
  		});
  	},
  
  
  	/* Selection (time range)
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Selects a date span on the view. `start` and `end` are both Moments.
  	// `ev` is the native mouse event that begin the interaction.
  	select: function(footprint, ev) {
  		this.unselect(ev);
  		this.renderSelectionFootprint(footprint);
  		this.reportSelection(footprint, ev);
  	},
  
  
  	renderSelectionFootprint: function(footprint, ev) {
  		if (this.renderSelection) { // legacy method in custom view classes
  			this.renderSelection(
  				footprint.toLegacy(this.calendar)
  			);
  		}
  		else {
  			InteractiveDateComponent.prototype.renderSelectionFootprint.apply(this, arguments);
  		}
  	},
  
  
  	// Called when a new selection is made. Updates internal state and triggers handlers.
  	reportSelection: function(footprint, ev) {
  		this.isSelected = true;
  		this.triggerSelect(footprint, ev);
  	},
  
  
  	// Triggers handlers to 'select'
  	triggerSelect: function(footprint, ev) {
  		var dateProfile = this.calendar.footprintToDateProfile(footprint); // abuse of "Event"DateProfile?
  
  		this.publiclyTrigger('select', {
  			context: this,
  			args: [
  				dateProfile.start,
  				dateProfile.end,
  				ev,
  				this
  			]
  		});
  	},
  
  
  	// Undoes a selection. updates in the internal state and triggers handlers.
  	// `ev` is the native mouse event that began the interaction.
  	unselect: function(ev) {
  		if (this.isSelected) {
  			this.isSelected = false;
  			if (this.destroySelection) {
  				this.destroySelection(); // TODO: deprecate
  			}
  			this.unrenderSelection();
  			this.publiclyTrigger('unselect', {
  				context: this,
  				args: [ ev, this ]
  			});
  		}
  	},
  
  
  	/* Event Selection
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	selectEventInstance: function(eventInstance) {
  		if (
  			!this.selectedEventInstance ||
  			this.selectedEventInstance !== eventInstance
  		) {
  			this.unselectEventInstance();
  
  			this.getEventSegs().forEach(function(seg) {
  				if (
  					seg.footprint.eventInstance === eventInstance &&
  					seg.el // necessary?
  				) {
  					seg.el.addClass('fc-selected');
  				}
  			});
  
  			this.selectedEventInstance = eventInstance;
  		}
  	},
  
  
  	unselectEventInstance: function() {
  		if (this.selectedEventInstance) {
  
  			this.getEventSegs().forEach(function(seg) {
  				if (seg.el) { // necessary?
  					seg.el.removeClass('fc-selected');
  				}
  			});
  
  			this.selectedEventInstance = null;
  		}
  	},
  
  
  	isEventDefSelected: function(eventDef) {
  		// event references might change on refetchEvents(), while selectedEventInstance doesn't,
  		// so compare IDs
  		return this.selectedEventInstance && this.selectedEventInstance.def.id === eventDef.id;
  	},
  
  
  	/* Mouse / Touch Unselecting (time range & event unselection)
  	------------------------------------------------------------------------------------------------------------------*/
  	// TODO: move consistently to down/start or up/end?
  	// TODO: don't kill previous selection if touch scrolling
  
  
  	handleDocumentMousedown: function(ev) {
  		if (isPrimaryMouseButton(ev)) {
  			this.processUnselect(ev);
  		}
  	},
  
  
  	processUnselect: function(ev) {
  		this.processRangeUnselect(ev);
  		this.processEventUnselect(ev);
  	},
  
  
  	processRangeUnselect: function(ev) {
  		var ignore;
  
  		// is there a time-range selection?
  		if (this.isSelected && this.opt('unselectAuto')) {
  			// only unselect if the clicked element is not identical to or inside of an 'unselectCancel' element
  			ignore = this.opt('unselectCancel');
  			if (!ignore || !$(ev.target).closest(ignore).length) {
  				this.unselect(ev);
  			}
  		}
  	},
  
  
  	processEventUnselect: function(ev) {
  		if (this.selectedEventInstance) {
  			if (!$(ev.target).closest('.fc-selected').length) {
  				this.unselectEventInstance();
  			}
  		}
  	},
  
  
  	/* Triggers
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	triggerBaseRendered: function() {
  		this.publiclyTrigger('viewRender', {
  			context: this,
  			args: [ this, this.el ]
  		});
  	},
  
  
  	triggerBaseUnrendered: function() {
  		this.publiclyTrigger('viewDestroy', {
  			context: this,
  			args: [ this, this.el ]
  		});
  	},
  
  
  	// Triggers handlers to 'dayClick'
  	// Span has start/end of the clicked area. Only the start is useful.
  	triggerDayClick: function(footprint, dayEl, ev) {
  		var dateProfile = this.calendar.footprintToDateProfile(footprint); // abuse of "Event"DateProfile?
  
  		this.publiclyTrigger('dayClick', {
  			context: dayEl,
  			args: [ dateProfile.start, ev, this ]
  		});
  	}
  
  });
  
  
  View.watch('displayingDates', [ 'isInDom', 'dateProfile' ], function(deps) {
  	this.requestDateRender(deps.dateProfile);
  }, function() {
  	this.requestDateUnrender();
  });
  
  
  View.watch('displayingBusinessHours', [ 'displayingDates', 'businessHourGenerator' ], function(deps) {
  	this.requestBusinessHoursRender(deps.businessHourGenerator);
  }, function() {
  	this.requestBusinessHoursUnrender();
  });
  
  
  View.watch('initialEvents', [ 'dateProfile' ], function(deps) {
  	return this.fetchInitialEvents(deps.dateProfile);
  });
  
  
  View.watch('bindingEvents', [ 'initialEvents' ], function(deps) {
  	this.setEvents(deps.initialEvents);
  	this.bindEventChanges();
  }, function() {
  	this.unbindEventChanges();
  	this.unsetEvents();
  });
  
  
  View.watch('displayingEvents', [ 'displayingDates', 'hasEvents' ], function() {
  	this.requestEventsRender(this.get('currentEvents'));
  }, function() {
  	this.requestEventsUnrender();
  });
  
  
  View.watch('title', [ 'dateProfile' ], function(deps) {
  	return (this.title = this.computeTitle(deps.dateProfile)); // assign to View for legacy reasons
  });
  
  
  View.watch('legacyDateProps', [ 'dateProfile' ], function(deps) {
  	var calendar = this.calendar;
  	var dateProfile = deps.dateProfile;
  
  	// DEPRECATED, but we need to keep it updated...
  	this.start = calendar.msToMoment(dateProfile.activeUnzonedRange.startMs, dateProfile.isRangeAllDay);
  	this.end = calendar.msToMoment(dateProfile.activeUnzonedRange.endMs, dateProfile.isRangeAllDay);
  	this.intervalStart = calendar.msToMoment(dateProfile.currentUnzonedRange.startMs, dateProfile.isRangeAllDay);
  	this.intervalEnd = calendar.msToMoment(dateProfile.currentUnzonedRange.endMs, dateProfile.isRangeAllDay);
  });
  
  ;;
  
  View.mixin({
  
  	usesMinMaxTime: false, // whether minTime/maxTime will affect the activeUnzonedRange. Views must opt-in.
  
  	// DEPRECATED
  	start: null, // use activeUnzonedRange
  	end: null, // use activeUnzonedRange
  	intervalStart: null, // use currentUnzonedRange
  	intervalEnd: null, // use currentUnzonedRange
  
  
  	/* Date Range Computation
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Builds a structure with info about what the dates/ranges will be for the "prev" view.
  	buildPrevDateProfile: function(date) {
  		var dateProfile = this.get('dateProfile');
  		var prevDate = date.clone().startOf(dateProfile.currentRangeUnit)
  			.subtract(dateProfile.dateIncrement);
  
  		return this.buildDateProfile(prevDate, -1);
  	},
  
  
  	// Builds a structure with info about what the dates/ranges will be for the "next" view.
  	buildNextDateProfile: function(date) {
  		var dateProfile = this.get('dateProfile');
  		var nextDate = date.clone().startOf(dateProfile.currentRangeUnit)
  			.add(dateProfile.dateIncrement);
  
  		return this.buildDateProfile(nextDate, 1);
  	},
  
  
  	// Builds a structure holding dates/ranges for rendering around the given date.
  	// Optional direction param indicates whether the date is being incremented/decremented
  	// from its previous value. decremented = -1, incremented = 1 (default).
  	buildDateProfile: function(date, direction, forceToValid) {
  		var isDateAllDay = !date.hasTime();
  		var validUnzonedRange;
  		var minTime = null;
  		var maxTime = null;
  		var currentInfo;
  		var isRangeAllDay;
  		var renderUnzonedRange;
  		var activeUnzonedRange;
  		var isValid;
  
  		validUnzonedRange = this.buildValidRange();
  		validUnzonedRange = this.trimHiddenDays(validUnzonedRange);
  
  		if (forceToValid) {
  			date = this.calendar.msToUtcMoment(
  				validUnzonedRange.constrainDate(date), // returns MS
  				isDateAllDay
  			);
  		}
  
  		currentInfo = this.buildCurrentRangeInfo(date, direction);
  		isRangeAllDay = /^(year|month|week|day)$/.test(currentInfo.unit);
  		renderUnzonedRange = this.buildRenderRange(
  			this.trimHiddenDays(currentInfo.unzonedRange),
  			currentInfo.unit,
  			isRangeAllDay
  		);
  		renderUnzonedRange = this.trimHiddenDays(renderUnzonedRange);
  		activeUnzonedRange = renderUnzonedRange.clone();
  
  		if (!this.opt('showNonCurrentDates')) {
  			activeUnzonedRange = activeUnzonedRange.intersect(currentInfo.unzonedRange);
  		}
  
  		minTime = moment.duration(this.opt('minTime'));
  		maxTime = moment.duration(this.opt('maxTime'));
  		activeUnzonedRange = this.adjustActiveRange(activeUnzonedRange, minTime, maxTime);
  		activeUnzonedRange = activeUnzonedRange.intersect(validUnzonedRange); // might return null
  
  		if (activeUnzonedRange) {
  			date = this.calendar.msToUtcMoment(
  				activeUnzonedRange.constrainDate(date), // returns MS
  				isDateAllDay
  			);
  		}
  
  		// it's invalid if the originally requested date is not contained,
  		// or if the range is completely outside of the valid range.
  		isValid = currentInfo.unzonedRange.intersectsWith(validUnzonedRange);
  
  		return {
  			// constraint for where prev/next operations can go and where events can be dragged/resized to.
  			// an object with optional start and end properties.
  			validUnzonedRange: validUnzonedRange,
  
  			// range the view is formally responsible for.
  			// for example, a month view might have 1st-31st, excluding padded dates
  			currentUnzonedRange: currentInfo.unzonedRange,
  
  			// name of largest unit being displayed, like "month" or "week"
  			currentRangeUnit: currentInfo.unit,
  
  			isRangeAllDay: isRangeAllDay,
  
  			// dates that display events and accept drag-n-drop
  			// will be `null` if no dates accept events
  			activeUnzonedRange: activeUnzonedRange,
  
  			// date range with a rendered skeleton
  			// includes not-active days that need some sort of DOM
  			renderUnzonedRange: renderUnzonedRange,
  
  			// Duration object that denotes the first visible time of any given day
  			minTime: minTime,
  
  			// Duration object that denotes the exclusive visible end time of any given day
  			maxTime: maxTime,
  
  			isValid: isValid,
  
  			date: date,
  
  			// how far the current date will move for a prev/next operation
  			dateIncrement: this.buildDateIncrement(currentInfo.duration)
  				// pass a fallback (might be null) ^
  		};
  	},
  
  
  	// Builds an object with optional start/end properties.
  	// Indicates the minimum/maximum dates to display.
  	// not responsible for trimming hidden days.
  	buildValidRange: function() {
  		return this.getUnzonedRangeOption('validRange', this.calendar.getNow()) ||
  			new UnzonedRange(); // completely open-ended
  	},
  
  
  	// Builds a structure with info about the "current" range, the range that is
  	// highlighted as being the current month for example.
  	// See buildDateProfile for a description of `direction`.
  	// Guaranteed to have `range` and `unit` properties. `duration` is optional.
  	// TODO: accept a MS-time instead of a moment `date`?
  	buildCurrentRangeInfo: function(date, direction) {
  		var duration = null;
  		var unit = null;
  		var unzonedRange = null;
  		var dayCount;
  
  		if (this.viewSpec.duration) {
  			duration = this.viewSpec.duration;
  			unit = this.viewSpec.durationUnit;
  			unzonedRange = this.buildRangeFromDuration(date, direction, duration, unit);
  		}
  		else if ((dayCount = this.opt('dayCount'))) {
  			unit = 'day';
  			unzonedRange = this.buildRangeFromDayCount(date, direction, dayCount);
  		}
  		else if ((unzonedRange = this.buildCustomVisibleRange(date))) {
  			unit = computeGreatestUnit(unzonedRange.getStart(), unzonedRange.getEnd());
  		}
  		else {
  			duration = this.getFallbackDuration();
  			unit = computeGreatestUnit(duration);
  			unzonedRange = this.buildRangeFromDuration(date, direction, duration, unit);
  		}
  
  		return { duration: duration, unit: unit, unzonedRange: unzonedRange };
  	},
  
  
  	getFallbackDuration: function() {
  		return moment.duration({ days: 1 });
  	},
  
  
  	// Returns a new activeUnzonedRange to have time values (un-ambiguate)
  	// minTime or maxTime causes the range to expand.
  	adjustActiveRange: function(unzonedRange, minTime, maxTime) {
  		var start = unzonedRange.getStart();
  		var end = unzonedRange.getEnd();
  
  		if (this.usesMinMaxTime) {
  
  			if (minTime < 0) {
  				start.time(0).add(minTime);
  			}
  
  			if (maxTime > 24 * 60 * 60 * 1000) { // beyond 24 hours?
  				end.time(maxTime - (24 * 60 * 60 * 1000));
  			}
  		}
  
  		return new UnzonedRange(start, end);
  	},
  
  
  	// Builds the "current" range when it is specified as an explicit duration.
  	// `unit` is the already-computed computeGreatestUnit value of duration.
  	// TODO: accept a MS-time instead of a moment `date`?
  	buildRangeFromDuration: function(date, direction, duration, unit) {
  		var alignment = this.opt('dateAlignment');
  		var start = date.clone();
  		var end;
  		var dateIncrementInput;
  		var dateIncrementDuration;
  
  		// if the view displays a single day or smaller
  		if (duration.as('days') <= 1) {
  			if (this.isHiddenDay(start)) {
  				start = this.skipHiddenDays(start, direction);
  				start.startOf('day');
  			}
  		}
  
  		// compute what the alignment should be
  		if (!alignment) {
  			dateIncrementInput = this.opt('dateIncrement');
  
  			if (dateIncrementInput) {
  				dateIncrementDuration = moment.duration(dateIncrementInput);
  
  				// use the smaller of the two units
  				if (dateIncrementDuration < duration) {
  					alignment = computeDurationGreatestUnit(dateIncrementDuration, dateIncrementInput);
  				}
  				else {
  					alignment = unit;
  				}
  			}
  			else {
  				alignment = unit;
  			}
  		}
  
  		start.startOf(alignment);
  		end = start.clone().add(duration);
  
  		return new UnzonedRange(start, end);
  	},
  
  
  	// Builds the "current" range when a dayCount is specified.
  	// TODO: accept a MS-time instead of a moment `date`?
  	buildRangeFromDayCount: function(date, direction, dayCount) {
  		var customAlignment = this.opt('dateAlignment');
  		var runningCount = 0;
  		var start = date.clone();
  		var end;
  
  		if (customAlignment) {
  			start.startOf(customAlignment);
  		}
  
  		start.startOf('day');
  		start = this.skipHiddenDays(start, direction);
  
  		end = start.clone();
  		do {
  			end.add(1, 'day');
  			if (!this.isHiddenDay(end)) {
  				runningCount++;
  			}
  		} while (runningCount < dayCount);
  
  		return new UnzonedRange(start, end);
  	},
  
  
  	// Builds a normalized range object for the "visible" range,
  	// which is a way to define the currentUnzonedRange and activeUnzonedRange at the same time.
  	// TODO: accept a MS-time instead of a moment `date`?
  	buildCustomVisibleRange: function(date) {
  		var visibleUnzonedRange = this.getUnzonedRangeOption(
  			'visibleRange',
  			this.calendar.applyTimezone(date) // correct zone. also generates new obj that avoids mutations
  		);
  
  		if (visibleUnzonedRange && (visibleUnzonedRange.startMs === null || visibleUnzonedRange.endMs === null)) {
  			return null;
  		}
  
  		return visibleUnzonedRange;
  	},
  
  
  	// Computes the range that will represent the element/cells for *rendering*,
  	// but which may have voided days/times.
  	// not responsible for trimming hidden days.
  	buildRenderRange: function(currentUnzonedRange, currentRangeUnit, isRangeAllDay) {
  		return currentUnzonedRange.clone();
  	},
  
  
  	// Compute the duration value that should be added/substracted to the current date
  	// when a prev/next operation happens.
  	buildDateIncrement: function(fallback) {
  		var dateIncrementInput = this.opt('dateIncrement');
  		var customAlignment;
  
  		if (dateIncrementInput) {
  			return moment.duration(dateIncrementInput);
  		}
  		else if ((customAlignment = this.opt('dateAlignment'))) {
  			return moment.duration(1, customAlignment);
  		}
  		else if (fallback) {
  			return fallback;
  		}
  		else {
  			return moment.duration({ days: 1 });
  		}
  	},
  
  
  	// Remove days from the beginning and end of the range that are computed as hidden.
  	trimHiddenDays: function(inputUnzonedRange) {
  		var start = inputUnzonedRange.getStart();
  		var end = inputUnzonedRange.getEnd();
  
  		if (start) {
  			start = this.skipHiddenDays(start);
  		}
  
  		if (end) {
  			end = this.skipHiddenDays(end, -1, true);
  		}
  
  		return new UnzonedRange(start, end);
  	},
  
  
  	// For DateComponent::getDayClasses
  	isDateInOtherMonth: function(date, dateProfile) {
  		return false;
  	},
  
  
  	// Arguments after name will be forwarded to a hypothetical function value
  	// WARNING: passed-in arguments will be given to generator functions as-is and can cause side-effects.
  	// Always clone your objects if you fear mutation.
  	getUnzonedRangeOption: function(name) {
  		var val = this.opt(name);
  
  		if (typeof val === 'function') {
  			val = val.apply(
  				null,
  				Array.prototype.slice.call(arguments, 1)
  			);
  		}
  
  		if (val) {
  			return this.calendar.parseUnzonedRange(val);
  		}
  	},
  
  
  	/* Hidden Days
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// 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.
  	// DOES NOT CONSIDER validUnzonedRange!
  	// 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;
  	}
  
  });
  
  ;;
  
  /* Toolbar with buttons and title
  ----------------------------------------------------------------------------------------------------------------------*/
  
  function Toolbar(calendar, toolbarOptions) {
  	var t = this;
  
  	// exports
  	t.setToolbarOptions = setToolbarOptions;
  	t.render = render;
  	t.removeElement = removeElement;
  	t.updateTitle = updateTitle;
  	t.activateButton = activateButton;
  	t.deactivateButton = deactivateButton;
  	t.disableButton = disableButton;
  	t.enableButton = enableButton;
  	t.getViewsWithButtons = getViewsWithButtons;
  	t.el = null; // mirrors local `el`
  
  	// locals
  	var el;
  	var viewsWithButtons = [];
  
  	// method to update toolbar-specific options, not calendar-wide options
  	function setToolbarOptions(newToolbarOptions) {
  		toolbarOptions = newToolbarOptions;
  	}
  
  	// can be called repeatedly and will rerender
  	function render() {
  		var sections = toolbarOptions.layout;
  
  		if (sections) {
  			if (!el) {
  				el = this.el = $("<div class='fc-toolbar "+ toolbarOptions.extraClasses + "'/>");
  			}
  			else {
  				el.empty();
  			}
  			el.append(renderSection('left'))
  				.append(renderSection('right'))
  				.append(renderSection('center'))
  				.append('<div class="fc-clear"/>');
  		}
  		else {
  			removeElement();
  		}
  	}
  
  
  	function removeElement() {
  		if (el) {
  			el.remove();
  			el = t.el = null;
  		}
  	}
  
  
  	function renderSection(position) {
  		var theme = calendar.theme;
  		var sectionEl = $('<div class="fc-' + position + '"/>');
  		var buttonStr = toolbarOptions.layout[position];
  		var calendarCustomButtons = calendar.opt('customButtons') || {};
  		var calendarButtonTextOverrides = calendar.overrides.buttonText || {};
  		var calendarButtonText = calendar.opt('buttonText') || {};
  
  		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 buttonIcon; // only one of these will be set
  					var buttonText; // "
  					var buttonInnerHtml;
  					var buttonClasses;
  					var buttonEl;
  
  					if (buttonName == 'title') {
  						groupChildren = groupChildren.add($('<h2>&nbsp;</h2>')); // we always want it to take up height
  						isOnlyButtons = false;
  					}
  					else {
  
  						if ((customButtonProps = calendarCustomButtons[buttonName])) {
  							buttonClick = function(ev) {
  								if (customButtonProps.click) {
  									customButtonProps.click.call(buttonEl[0], ev);
  								}
  							};
  							(buttonIcon = theme.getCustomButtonIconClass(customButtonProps)) ||
  							(buttonIcon = theme.getIconClass(buttonName)) ||
  							(buttonText = customButtonProps.text); // jshint ignore:line
  						}
  						else if ((viewSpec = calendar.getViewSpec(buttonName))) {
  							viewsWithButtons.push(buttonName);
  							buttonClick = function() {
  								calendar.changeView(buttonName);
  							};
  							(buttonText = viewSpec.buttonTextOverride) ||
  							(buttonIcon = theme.getIconClass(buttonName)) ||
  							(buttonText = viewSpec.buttonTextDefault); // jshint ignore:line
  						}
  						else if (calendar[buttonName]) { // a calendar method
  							buttonClick = function() {
  								calendar[buttonName]();
  							};
  							(buttonText = calendarButtonTextOverrides[buttonName]) ||
  							(buttonIcon = theme.getIconClass(buttonName)) ||
  							(buttonText = calendarButtonText[buttonName]); // jshint ignore:line
  							//            ^ everything else is considered default
  						}
  
  						if (buttonClick) {
  
  							buttonClasses = [
  								'fc-' + buttonName + '-button',
  								theme.getClass('button'),
  								theme.getClass('stateDefault')
  							];
  
  							if (buttonText) {
  								buttonInnerHtml = htmlEscape(buttonText);
  							}
  							else if (buttonIcon) {
  								buttonInnerHtml = "<span class='" + buttonIcon + "'></span>";
  							}
  
  							buttonEl = $( // type="button" so that it doesn't submit a form
  								'<button type="button" class="' + buttonClasses.join(' ') + '">' +
  									buttonInnerHtml +
  								'</button>'
  								)
  								.click(function(ev) {
  									// don't process clicks for disabled buttons
  									if (!buttonEl.hasClass(theme.getClass('stateDisabled'))) {
  
  										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 (
  											buttonEl.hasClass(theme.getClass('stateActive')) ||
  											buttonEl.hasClass(theme.getClass('stateDisabled'))
  										) {
  											buttonEl.removeClass(theme.getClass('stateHover'));
  										}
  									}
  								})
  								.mousedown(function() {
  									// the *down* effect (mouse pressed in).
  									// only on buttons that are not the "active" tab, or disabled
  									buttonEl
  										.not('.' + theme.getClass('stateActive'))
  										.not('.' + theme.getClass('stateDisabled'))
  										.addClass(theme.getClass('stateDown'));
  								})
  								.mouseup(function() {
  									// undo the *down* effect
  									buttonEl.removeClass(theme.getClass('stateDown'));
  								})
  								.hover(
  									function() {
  										// the *hover* effect.
  										// only on buttons that are not the "active" tab, or disabled
  										buttonEl
  											.not('.' + theme.getClass('stateActive'))
  											.not('.' + theme.getClass('stateDisabled'))
  											.addClass(theme.getClass('stateHover'));
  									},
  									function() {
  										// undo the *hover* effect
  										buttonEl
  											.removeClass(theme.getClass('stateHover'))
  											.removeClass(theme.getClass('stateDown')); // if mouseleave happens before mouseup
  									}
  								);
  
  							groupChildren = groupChildren.add(buttonEl);
  						}
  					}
  				});
  
  				if (isOnlyButtons) {
  					groupChildren
  						.first().addClass(theme.getClass('cornerLeft')).end()
  						.last().addClass(theme.getClass('cornerRight')).end();
  				}
  
  				if (groupChildren.length > 1) {
  					groupEl = $('<div/>');
  					if (isOnlyButtons) {
  						groupEl.addClass(theme.getClass('buttonGroup'));
  					}
  					groupEl.append(groupChildren);
  					sectionEl.append(groupEl);
  				}
  				else {
  					sectionEl.append(groupChildren); // 1 or 0 children
  				}
  			});
  		}
  
  		return sectionEl;
  	}
  
  
  	function updateTitle(text) {
  		if (el) {
  			el.find('h2').text(text);
  		}
  	}
  
  
  	function activateButton(buttonName) {
  		if (el) {
  			el.find('.fc-' + buttonName + '-button')
  				.addClass(calendar.theme.getClass('stateActive'));
  		}
  	}
  
  
  	function deactivateButton(buttonName) {
  		if (el) {
  			el.find('.fc-' + buttonName + '-button')
  				.removeClass(calendar.theme.getClass('stateActive'));
  		}
  	}
  
  
  	function disableButton(buttonName) {
  		if (el) {
  			el.find('.fc-' + buttonName + '-button')
  				.prop('disabled', true)
  				.addClass(calendar.theme.getClass('stateDisabled'));
  		}
  	}
  
  
  	function enableButton(buttonName) {
  		if (el) {
  			el.find('.fc-' + buttonName + '-button')
  				.prop('disabled', false)
  				.removeClass(calendar.theme.getClass('stateDisabled'));
  		}
  	}
  
  
  	function getViewsWithButtons() {
  		return viewsWithButtons;
  	}
  
  }
  
  ;;
  
  var Calendar = FC.Calendar = Class.extend(EmitterMixin, ListenerMixin, {
  
  	view: null, // current View object
  	viewsByType: null, // holds all instantiated view instances, current or not
  	currentDate: null, // unzoned moment. private (public API should use getDate instead)
  	theme: null,
  	businessHourGenerator: null,
  	loadingLevel: 0, // number of simultaneous loading tasks
  
  
  	constructor: function(el, overrides) {
  
  		// declare the current calendar instance relies on GlobalEmitter. needed for garbage collection.
  		// unneeded() is called in destroy.
  		GlobalEmitter.needed();
  
  		this.el = el;
  		this.viewsByType = {};
  		this.viewSpecCache = {};
  
  		this.initOptionsInternals(overrides);
  		this.initMomentInternals(); // needs to happen after options hash initialized
  		this.initCurrentDate();
  		this.initEventManager();
  
  		this.constructed();
  	},
  
  
  	// useful for monkeypatching. TODO: BaseClass?
  	constructed: function() {
  	},
  
  
  	// Public API
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	getView: function() {
  		return this.view;
  	},
  
  
  	publiclyTrigger: function(name, triggerInfo) {
  		var optHandler = this.opt(name);
  		var context;
  		var args;
  
  		if ($.isPlainObject(triggerInfo)) {
  			context = triggerInfo.context;
  			args = triggerInfo.args;
  		}
  		else if ($.isArray(triggerInfo)) {
  			args = triggerInfo;
  		}
  
  		if (context == null) {
  			context = this.el[0]; // fallback context
  		}
  
  		if (!args) {
  			args = [];
  		}
  
  		this.triggerWith(name, context, args); // Emitter's method
  
  		if (optHandler) {
  			return optHandler.apply(context, args);
  		}
  	},
  
  
  	hasPublicHandlers: function(name) {
  		return this.hasHandlers(name) ||
  			this.opt(name); // handler specified in options
  	},
  
  
  	// View
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	// 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, spec);
  	},
  
  
  	// Returns a boolean about whether the view is okay to instantiate at some point
  	isValidViewType: function(viewType) {
  		return Boolean(this.getViewSpec(viewType));
  	},
  
  
  	changeView: function(viewName, dateOrRange) {
  
  		if (dateOrRange) {
  
  			if (dateOrRange.start && dateOrRange.end) { // a range
  				this.recordOptionOverrides({ // will not rerender
  					visibleRange: dateOrRange
  				});
  			}
  			else { // a date
  				this.currentDate = this.moment(dateOrRange).stripZone(); // just like gotoDate
  			}
  		}
  
  		this.renderView(viewName);
  	},
  
  
  	// Forces navigation to a view for the given date.
  	// `viewType` can be a specific view name or a generic one like "week" or "day".
  	zoomTo: function(newDate, viewType) {
  		var spec;
  
  		viewType = viewType || 'day'; // day is default zoom
  		spec = this.getViewSpec(viewType) || this.getUnitViewSpec(viewType);
  
  		this.currentDate = newDate.clone();
  		this.renderView(spec ? spec.type : null);
  	},
  
  
  	// Current Date
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	initCurrentDate: function() {
  		var defaultDateInput = this.opt('defaultDate');
  
  		// compute the initial ambig-timezone date
  		if (defaultDateInput != null) {
  			this.currentDate = this.moment(defaultDateInput).stripZone();
  		}
  		else {
  			this.currentDate = this.getNow(); // getNow already returns unzoned
  		}
  	},
  
  
  	prev: function() {
  		var prevInfo = this.view.buildPrevDateProfile(this.currentDate);
  
  		if (prevInfo.isValid) {
  			this.currentDate = prevInfo.date;
  			this.renderView();
  		}
  	},
  
  
  	next: function() {
  		var nextInfo = this.view.buildNextDateProfile(this.currentDate);
  
  		if (nextInfo.isValid) {
  			this.currentDate = nextInfo.date;
  			this.renderView();
  		}
  	},
  
  
  	prevYear: function() {
  		this.currentDate.add(-1, 'years');
  		this.renderView();
  	},
  
  
  	nextYear: function() {
  		this.currentDate.add(1, 'years');
  		this.renderView();
  	},
  
  
  	today: function() {
  		this.currentDate = this.getNow(); // should deny like prev/next?
  		this.renderView();
  	},
  
  
  	gotoDate: function(zonedDateInput) {
  		this.currentDate = this.moment(zonedDateInput).stripZone();
  		this.renderView();
  	},
  
  
  	incrementDate: function(delta) {
  		this.currentDate.add(moment.duration(delta));
  		this.renderView();
  	},
  
  
  	// for external API
  	getDate: function() {
  		return this.applyTimezone(this.currentDate); // infuse the calendar's timezone
  	},
  
  
  	// Loading Triggering
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	// Should be called when any type of async data fetching begins
  	pushLoading: function() {
  		if (!(this.loadingLevel++)) {
  			this.publiclyTrigger('loading', [ true, this.view ]);
  		}
  	},
  
  
  	// Should be called when any type of async data fetching completes
  	popLoading: function() {
  		if (!(--this.loadingLevel)) {
  			this.publiclyTrigger('loading', [ false, this.view ]);
  		}
  	},
  
  
  	// Selection
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	// this public method receives start/end dates in any format, with any timezone
  	select: function(zonedStartInput, zonedEndInput) {
  		this.view.select(
  			this.buildSelectFootprint.apply(this, arguments)
  		);
  	},
  
  
  	unselect: function() { // safe to be called before renderView
  		if (this.view) {
  			this.view.unselect();
  		}
  	},
  
  
  	// Given arguments to the select method in the API, returns a span (unzoned start/end and other info)
  	buildSelectFootprint: function(zonedStartInput, zonedEndInput) {
  		var start = this.moment(zonedStartInput).stripZone();
  		var end;
  
  		if (zonedEndInput) {
  			end = this.moment(zonedEndInput).stripZone();
  		}
  		else if (start.hasTime()) {
  			end = start.clone().add(this.defaultTimedEventDuration);
  		}
  		else {
  			end = start.clone().add(this.defaultAllDayEventDuration);
  		}
  
  		return new ComponentFootprint(
  			new UnzonedRange(start, end),
  			!start.hasTime()
  		);
  	},
  
  
  	// Misc
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	// will return `null` if invalid range
  	parseUnzonedRange: function(rangeInput) {
  		var start = null;
  		var end = null;
  
  		if (rangeInput.start) {
  			start = this.moment(rangeInput.start).stripZone();
  		}
  
  		if (rangeInput.end) {
  			end = this.moment(rangeInput.end).stripZone();
  		}
  
  		if (!start && !end) {
  			return null;
  		}
  
  		if (start && end && end.isBefore(start)) {
  			return null;
  		}
  
  		return new UnzonedRange(start, end);
  	},
  
  
  	rerenderEvents: function() { // API method. destroys old events if previously rendered.
  		this.view.flash('displayingEvents');
  	},
  
  
  	initEventManager: function() {
  		var _this = this;
  		var eventManager = new EventManager(this);
  		var rawSources = this.opt('eventSources') || [];
  		var singleRawSource = this.opt('events');
  
  		this.eventManager = eventManager;
  
  		if (singleRawSource) {
  			rawSources.unshift(singleRawSource);
  		}
  
  		eventManager.on('release', function(eventsPayload) {
  			_this.trigger('eventsReset', eventsPayload);
  		});
  
  		eventManager.freeze();
  
  		rawSources.forEach(function(rawSource) {
  			var source = EventSourceParser.parse(rawSource, _this);
  
  			if (source) {
  				eventManager.addSource(source);
  			}
  		});
  
  		eventManager.thaw();
  	},
  
  
  	requestEvents: function(start, end) {
  		return this.eventManager.requestEvents(
  			start,
  			end,
  			this.opt('timezone'),
  			!this.opt('lazyFetching')
  		);
  	}
  
  });
  
  ;;
  /*
  Options binding/triggering system.
  */
  Calendar.mixin({
  
  	dirDefaults: null, // option defaults related to LTR or RTL
  	localeDefaults: null, // option defaults related to current locale
  	overrides: null, // option overrides given to the fullCalendar constructor
  	dynamicOverrides: null, // options set with dynamic setter method. higher precedence than view overrides.
  	optionsModel: null, // all defaults combined with overrides
  
  
  	initOptionsInternals: function(overrides) {
  		this.overrides = $.extend({}, overrides); // make a copy
  		this.dynamicOverrides = {};
  		this.optionsModel = new Model();
  
  		this.populateOptionsHash();
  	},
  
  
  	// public getter/setter
  	option: function(name, value) {
  		var newOptionHash;
  
  		if (typeof name === 'string') {
  			if (value === undefined) { // getter
  				return this.optionsModel.get(name);
  			}
  			else { // setter for individual option
  				newOptionHash = {};
  				newOptionHash[name] = value;
  				this.setOptions(newOptionHash);
  			}
  		}
  		else if (typeof name === 'object') { // compound setter with object input
  			this.setOptions(name);
  		}
  	},
  
  
  	// private getter
  	opt: function(name) {
  		return this.optionsModel.get(name);
  	},
  
  
  	setOptions: function(newOptionHash) {
  		var optionCnt = 0;
  		var optionName;
  
  		this.recordOptionOverrides(newOptionHash); // will trigger optionsModel watchers
  
  		for (optionName in newOptionHash) {
  			optionCnt++;
  		}
  
  		// special-case handling of single option change.
  		// if only one option change, `optionName` will be its name.
  		if (optionCnt === 1) {
  			if (optionName === 'height' || optionName === 'contentHeight' || optionName === 'aspectRatio') {
  				this.updateViewSize(true); // isResize=true
  				return;
  			}
  			else if (optionName === 'defaultDate') {
  				return; // can't change date this way. use gotoDate instead
  			}
  			else if (optionName === 'businessHours') {
  				return; // optionsModel already reacts to this
  			}
  			else if (optionName === 'timezone') {
  				this.view.flash('initialEvents');
  				return;
  			}
  		}
  
  		// catch-all. rerender the header and footer and rebuild/rerender the current view
  		this.renderHeader();
  		this.renderFooter();
  
  		// even non-current views will be affected by this option change. do before rerender
  		// TODO: detangle
  		this.viewsByType = {};
  
  		this.reinitView();
  	},
  
  
  	// Computes the flattened options hash for the calendar and assigns to `this.options`.
  	// Assumes this.overrides and this.dynamicOverrides have already been initialized.
  	populateOptionsHash: function() {
  		var locale, localeDefaults;
  		var isRTL, dirDefaults;
  		var rawOptions;
  
  		locale = firstDefined( // explicit locale option given?
  			this.dynamicOverrides.locale,
  			this.overrides.locale
  		);
  		localeDefaults = localeOptionHash[locale];
  		if (!localeDefaults) { // explicit locale option not given or invalid?
  			locale = Calendar.defaults.locale;
  			localeDefaults = localeOptionHash[locale] || {};
  		}
  
  		isRTL = firstDefined( // based on options computed so far, is direction RTL?
  			this.dynamicOverrides.isRTL,
  			this.overrides.isRTL,
  			localeDefaults.isRTL,
  			Calendar.defaults.isRTL
  		);
  		dirDefaults = isRTL ? Calendar.rtlDefaults : {};
  
  		this.dirDefaults = dirDefaults;
  		this.localeDefaults = localeDefaults;
  
  		rawOptions = mergeOptions([ // merge defaults and overrides. lowest to highest precedence
  			Calendar.defaults, // global defaults
  			dirDefaults,
  			localeDefaults,
  			this.overrides,
  			this.dynamicOverrides
  		]);
  		populateInstanceComputableOptions(rawOptions); // fill in gaps with computed options
  
  		this.optionsModel.reset(rawOptions);
  	},
  
  
  	// stores the new options internally, but does not rerender anything.
  	recordOptionOverrides: function(newOptionHash) {
  		var optionName;
  
  		for (optionName in newOptionHash) {
  			this.dynamicOverrides[optionName] = newOptionHash[optionName];
  		}
  
  		this.viewSpecCache = {}; // the dynamic override invalidates the options in this cache, so just clear it
  		this.populateOptionsHash(); // this.options needs to be recomputed after the dynamic override
  	}
  
  });
  
  ;;
  
  Calendar.mixin({
  
  	defaultAllDayEventDuration: null,
  	defaultTimedEventDuration: null,
  	localeData: null,
  
  
  	initMomentInternals: function() {
  		var _this = this;
  
  		this.defaultAllDayEventDuration = moment.duration(this.opt('defaultAllDayEventDuration'));
  		this.defaultTimedEventDuration = moment.duration(this.opt('defaultTimedEventDuration'));
  
  		// Called immediately, and when any of the options change.
  		// Happens before any internal objects rebuild or rerender, because this is very core.
  		this.optionsModel.watch('buildingMomentLocale', [
  			'?locale', '?monthNames', '?monthNamesShort', '?dayNames', '?dayNamesShort',
  			'?firstDay', '?weekNumberCalculation'
  		], function(opts) {
  			var weekNumberCalculation = opts.weekNumberCalculation;
  			var firstDay = opts.firstDay;
  			var _week;
  
  			// normalize
  			if (weekNumberCalculation === 'iso') {
  				weekNumberCalculation = 'ISO'; // normalize
  			}
  
  			var localeData = Object.create( // make a cheap copy
  				getMomentLocaleData(opts.locale) // will fall back to en
  			);
  
  			if (opts.monthNames) {
  				localeData._months = opts.monthNames;
  			}
  			if (opts.monthNamesShort) {
  				localeData._monthsShort = opts.monthNamesShort;
  			}
  			if (opts.dayNames) {
  				localeData._weekdays = opts.dayNames;
  			}
  			if (opts.dayNamesShort) {
  				localeData._weekdaysShort = opts.dayNamesShort;
  			}
  
  			if (firstDay == null && weekNumberCalculation === 'ISO') {
  				firstDay = 1;
  			}
  			if (firstDay != null) {
  				_week = Object.create(localeData._week); // _week: { dow: # }
  				_week.dow = firstDay;
  				localeData._week = _week;
  			}
  
  			if ( // whitelist certain kinds of input
  				weekNumberCalculation === 'ISO' ||
  				weekNumberCalculation === 'local' ||
  				typeof weekNumberCalculation === 'function'
  			) {
  				localeData._fullCalendar_weekCalc = weekNumberCalculation; // moment-ext will know what to do with it
  			}
  
  			_this.localeData = localeData;
  
  			// If the internal current date object already exists, move to new locale.
  			// We do NOT need to do this technique for event dates, because this happens when converting to "segments".
  			if (_this.currentDate) {
  				_this.localizeMoment(_this.currentDate); // sets to localeData
  			}
  		});
  	},
  
  
  	// Builds a moment using the settings of the current calendar: timezone and locale.
  	// Accepts anything the vanilla moment() constructor accepts.
  	moment: function() {
  		var mom;
  
  		if (this.opt('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 (this.opt('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
  		}
  
  		this.localizeMoment(mom); // TODO
  
  		return mom;
  	},
  
  
  	msToMoment: function(ms, forceAllDay) {
  		var mom = FC.moment.utc(ms); // TODO: optimize by using Date.UTC
  
  		if (forceAllDay) {
  			mom.stripTime();
  		}
  		else {
  			mom = this.applyTimezone(mom); // may or may not apply locale
  		}
  
  		this.localizeMoment(mom);
  
  		return mom;
  	},
  
  
  	msToUtcMoment: function(ms, forceAllDay) {
  		var mom = FC.moment.utc(ms); // TODO: optimize by using Date.UTC
  
  		if (forceAllDay) {
  			mom.stripTime();
  		}
  
  		this.localizeMoment(mom);
  
  		return mom;
  	},
  
  
  	// Updates the given moment's locale settings to the current calendar locale settings.
  	localizeMoment: function(mom) {
  		mom._locale = this.localeData;
  	},
  
  
  	// Returns a boolean about whether or not the calendar knows how to calculate
  	// the timezone offset of arbitrary dates in the current timezone.
  	getIsAmbigTimezone: function() {
  		return this.opt('timezone') !== 'local' && this.opt('timezone') !== 'UTC';
  	},
  
  
  	// Returns a copy of the given date in the current timezone. Has no effect on dates without times.
  	applyTimezone: function(date) {
  		if (!date.hasTime()) {
  			return date.clone();
  		}
  
  		var zonedDate = this.moment(date.toArray());
  		var timeAdjust = date.time() - zonedDate.time();
  		var adjustedZonedDate;
  
  		// Safari sometimes has problems with this coersion when near DST. Adjust if necessary. (bug #2396)
  		if (timeAdjust) { // is the time result different than expected?
  			adjustedZonedDate = zonedDate.clone().add(timeAdjust); // add milliseconds
  			if (date.time() - adjustedZonedDate.time() === 0) { // does it match perfectly now?
  				zonedDate = adjustedZonedDate;
  			}
  		}
  
  		return zonedDate;
  	},
  
  
  	/*
  	Assumes the footprint is non-open-ended.
  	*/
  	footprintToDateProfile: function(componentFootprint, ignoreEnd) {
  		var start = FC.moment.utc(componentFootprint.unzonedRange.startMs);
  		var end;
  
  		if (!ignoreEnd) {
  			end = FC.moment.utc(componentFootprint.unzonedRange.endMs);
  		}
  
  		if (componentFootprint.isAllDay) {
  			start.stripTime();
  
  			if (end) {
  				end.stripTime();
  			}
  		}
  		else {
  			start = this.applyTimezone(start);
  
  			if (end) {
  				end = this.applyTimezone(end);
  			}
  		}
  
  		return new EventDateProfile(start, end, this);
  	},
  
  
  	// Returns a moment for the current date, as defined by the client's computer or from the `now` option.
  	// Will return an moment with an ambiguous timezone.
  	getNow: function() {
  		var now = this.opt('now');
  		if (typeof now === 'function') {
  			now = now();
  		}
  		return this.moment(now).stripZone();
  	},
  
  
  	// Produces a human-readable string for the given duration.
  	// Side-effect: changes the locale of the given duration.
  	humanizeDuration: function(duration) {
  		return duration.locale(this.opt('locale')).humanize();
  	},
  
  
  
  	// Event-Specific Date Utilities. TODO: move
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	// Get an event's normalized end date. If not present, calculate it from the defaults.
  	getEventEnd: function(event) {
  		if (event.end) {
  			return event.end.clone();
  		}
  		else {
  			return this.getDefaultEventEnd(event.allDay, event.start);
  		}
  	},
  
  
  	// Given an event's allDay status and start date, return what its fallback end date should be.
  	// TODO: rename to computeDefaultEventEnd
  	getDefaultEventEnd: function(allDay, zonedStart) {
  		var end = zonedStart.clone();
  
  		if (allDay) {
  			end.stripTime().add(this.defaultAllDayEventDuration);
  		}
  		else {
  			end.add(this.defaultTimedEventDuration);
  		}
  
  		if (this.getIsAmbigTimezone()) {
  			end.stripZone(); // we don't know what the tzo should be
  		}
  
  		return end;
  	}
  
  });
  
  ;;
  
  Calendar.mixin({
  
  	viewSpecCache: null, // cache of view definitions (initialized in Calendar.js)
  
  
  	// 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, unitsDesc) != -1) {
  
  			// put views that have buttons first. there will be duplicates, but oh well
  			viewTypes = this.header.getViewsWithButtons(); // TODO: include footer as well?
  			$.each(FC.views, function(viewType) { // all views
  				viewTypes.push(viewType);
  			});
  
  			for (i = 0; i < viewTypes.length; i++) {
  				spec = this.getViewSpec(viewTypes[i]);
  				if (spec) {
  					if (spec.singleUnit == unit) {
  						return spec;
  					}
  				}
  			}
  		}
  	},
  
  
  	// Builds an object with information on how to create a given view
  	buildViewSpec: function(requestedViewType) {
  		var viewOverrides = this.overrides.views || {};
  		var specChain = []; // for the view. lowest to highest priority
  		var defaultsChain = []; // for the view. lowest to highest priority
  		var overridesChain = []; // for the view. lowest to highest priority
  		var viewType = requestedViewType;
  		var spec; // for the view
  		var overrides; // for the view
  		var durationInput;
  		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 || {});
  				durationInput = durationInput || spec.duration;
  				viewType = viewType || spec.type;
  			}
  
  			if (overrides) {
  				overridesChain.unshift(overrides); // view-specific option hashes have options at zero-level
  				durationInput = durationInput || overrides.duration;
  				viewType = viewType || overrides.type;
  			}
  		}
  
  		spec = mergeProps(specChain);
  		spec.type = requestedViewType;
  		if (!spec['class']) {
  			return false;
  		}
  
  		// fall back to top-level `duration` option
  		durationInput = durationInput ||
  			this.dynamicOverrides.duration ||
  			this.overrides.duration;
  
  		if (durationInput) {
  			duration = moment.duration(durationInput);
  
  			if (duration.valueOf()) { // valid?
  
  				unit = computeDurationGreatestUnit(duration, durationInput);
  
  				spec.duration = duration;
  				spec.durationUnit = unit;
  
  				// view is a single-unit duration, like "week" or "day"
  				// incorporate options for this. lowest priority
  				if (duration.as(unit) === 1) {
  					spec.singleUnit = unit;
  					overridesChain.unshift(viewOverrides[unit] || {});
  				}
  			}
  		}
  
  		spec.defaults = mergeOptions(defaultsChain);
  		spec.overrides = mergeOptions(overridesChain);
  
  		this.buildViewSpecOptions(spec);
  		this.buildViewSpecButtonText(spec, requestedViewType);
  
  		return spec;
  	},
  
  
  	// Builds and assigns a view spec's options object from its already-assigned defaults and overrides
  	buildViewSpecOptions: function(spec) {
  		spec.options = mergeOptions([ // lowest to highest priority
  			Calendar.defaults, // global defaults
  			spec.defaults, // view's defaults (from ViewSubclass.defaults)
  			this.dirDefaults,
  			this.localeDefaults, // locale and dir take precedence over view's defaults!
  			this.overrides, // calendar's overrides (options given to constructor)
  			spec.overrides, // view's overrides (view-specific options)
  			this.dynamicOverrides // dynamically set via setter. highest precedence
  		]);
  		populateInstanceComputableOptions(spec.options);
  	},
  
  
  	// Computes and assigns a view spec's buttonText-related options
  	buildViewSpecButtonText: function(spec, requestedViewType) {
  
  		// given an options object with a possible `buttonText` hash, lookup the buttonText for the
  		// requested view, falling back to a generic unit entry like "week" or "day"
  		function queryButtonText(options) {
  			var buttonText = options.buttonText || {};
  			return buttonText[requestedViewType] ||
  				// view can decide to look up a certain key
  				(spec.buttonTextKey ? buttonText[spec.buttonTextKey] : null) ||
  				// a key like "month"
  				(spec.singleUnit ? buttonText[spec.singleUnit] : null);
  		}
  
  		// highest to lowest priority
  		spec.buttonTextOverride =
  			queryButtonText(this.dynamicOverrides) ||
  			queryButtonText(this.overrides) || // constructor-specified buttonText lookup hash takes precedence
  			spec.overrides.buttonText; // `buttonText` for view-specific options is a string
  
  		// highest to lowest priority. mirrors buildViewSpecOptions
  		spec.buttonTextDefault =
  			queryButtonText(this.localeDefaults) ||
  			queryButtonText(this.dirDefaults) ||
  			spec.defaults.buttonText || // a single string. from ViewSubclass.defaults
  			queryButtonText(Calendar.defaults) ||
  			(spec.duration ? this.humanizeDuration(spec.duration) : null) || // like "3 days"
  			requestedViewType; // fall back to given view name
  	}
  
  });
  
  ;;
  
  Calendar.mixin({
  
  	el: null,
  	contentEl: null,
  	suggestedViewHeight: null,
  	ignoreUpdateViewSize: 0,
  	freezeContentHeightDepth: 0,
  	windowResizeProxy: null,
  
  
  	render: function() {
  		if (!this.contentEl) {
  			this.initialRender();
  		}
  		else if (this.elementVisible()) {
  			// mainly for the public API
  			this.calcSize();
  			this.renderView();
  		}
  	},
  
  
  	initialRender: function() {
  		var _this = this;
  		var el = this.el;
  
  		el.addClass('fc');
  
  		// event delegation for nav links
  		el.on('click.fc', 'a[data-goto]', function(ev) {
  			var anchorEl = $(this);
  			var gotoOptions = anchorEl.data('goto'); // will automatically parse JSON
  			var date = _this.moment(gotoOptions.date);
  			var viewType = gotoOptions.type;
  
  			// property like "navLinkDayClick". might be a string or a function
  			var customAction = _this.view.opt('navLink' + capitaliseFirstLetter(viewType) + 'Click');
  
  			if (typeof customAction === 'function') {
  				customAction(date, ev);
  			}
  			else {
  				if (typeof customAction === 'string') {
  					viewType = customAction;
  				}
  				_this.zoomTo(date, viewType);
  			}
  		});
  
  		// called immediately, and upon option change
  		this.optionsModel.watch('settingTheme', [ '?theme', '?themeSystem' ], function(opts) {
  			var themeClass = ThemeRegistry.getThemeClass(opts.themeSystem || opts.theme);
  			var theme = new themeClass(_this.optionsModel);
  			var widgetClass = theme.getClass('widget');
  
  			_this.theme = theme;
  
  			if (widgetClass) {
  				el.addClass(widgetClass);
  			}
  		}, function() {
  			var widgetClass = _this.theme.getClass('widget');
  
  			_this.theme = null;
  
  			if (widgetClass) {
  				el.removeClass(widgetClass);
  			}
  		});
  
  		this.optionsModel.watch('settingBusinessHourGenerator', [ '?businessHours' ], function(deps) {
  			_this.businessHourGenerator = new BusinessHourGenerator(deps.businessHours, _this);
  
  			if (_this.view) {
  				_this.view.set('businessHourGenerator', _this.businessHourGenerator);
  			}
  		}, function() {
  			_this.businessHourGenerator = null;
  		});
  
  		// called immediately, and upon option change.
  		// HACK: locale often affects isRTL, so we explicitly listen to that too.
  		this.optionsModel.watch('applyingDirClasses', [ '?isRTL', '?locale' ], function(opts) {
  			el.toggleClass('fc-ltr', !opts.isRTL);
  			el.toggleClass('fc-rtl', opts.isRTL);
  		});
  
  		this.contentEl = $("<div class='fc-view-container'/>").prependTo(el);
  
  		this.initToolbars();
  		this.renderHeader();
  		this.renderFooter();
  		this.renderView(this.opt('defaultView'));
  
  		if (this.opt('handleWindowResize')) {
  			$(window).resize(
  				this.windowResizeProxy = debounce( // prevents rapid calls
  					this.windowResize.bind(this),
  					this.opt('windowResizeDelay')
  				)
  			);
  		}
  	},
  
  
  	destroy: function() {
  		if (this.view) {
  			this.clearView();
  		}
  
  		this.toolbarsManager.proxyCall('removeElement');
  		this.contentEl.remove();
  		this.el.removeClass('fc fc-ltr fc-rtl');
  
  		// removes theme-related root className
  		this.optionsModel.unwatch('settingTheme');
  		this.optionsModel.unwatch('settingBusinessHourGenerator');
  
  		this.el.off('.fc'); // unbind nav link handlers
  
  		if (this.windowResizeProxy) {
  			$(window).unbind('resize', this.windowResizeProxy);
  			this.windowResizeProxy = null;
  		}
  
  		GlobalEmitter.unneeded();
  	},
  
  
  	elementVisible: function() {
  		return this.el.is(':visible');
  	},
  
  
  	// Render Queue
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	bindViewHandlers: function(view) {
  		var _this = this;
  
  		view.watch('titleForCalendar', [ 'title' ], function(deps) { // TODO: better system
  			if (view === _this.view) { // hack
  				_this.setToolbarsTitle(deps.title);
  			}
  		});
  
  		view.watch('dateProfileForCalendar', [ 'dateProfile' ], function(deps) {
  			if (view === _this.view) { // hack
  				_this.currentDate = deps.dateProfile.date; // might have been constrained by view dates
  				_this.updateToolbarButtons(deps.dateProfile);
  			}
  		});
  	},
  
  
  	unbindViewHandlers: function(view) {
  		this.stopListeningTo(view);
  
  		view.unwatch('titleForCalendar');
  		view.unwatch('dateProfileForCalendar');
  	},
  
  
  	// View Rendering
  	// -----------------------------------------------------------------------------------
  
  
  	// Renders a view because of a date change, view-type change, or for the first time.
  	// If not given a viewType, keep the current view but render different dates.
  	// Accepts an optional scroll state to restore to.
  	renderView: function(viewType) {
  		var oldView = this.view;
  		var newView;
  
  		this.freezeContentHeight();
  
  		if (oldView && viewType && oldView.type !== viewType) {
  			this.clearView();
  		}
  
  		// if viewType changed, or the view was never created, create a fresh view
  		if (!this.view && viewType) {
  			newView = this.view =
  				this.viewsByType[viewType] ||
  				(this.viewsByType[viewType] = this.instantiateView(viewType));
  
  			this.bindViewHandlers(newView);
  
  			newView.setElement(
  				$("<div class='fc-view fc-" + viewType + "-view' />").appendTo(this.contentEl)
  			);
  
  			this.toolbarsManager.proxyCall('activateButton', viewType);
  		}
  
  		if (this.view) {
  
  			// prevent unnecessary change firing
  			if (this.view.get('businessHourGenerator') !== this.businessHourGenerator) {
  				this.view.set('businessHourGenerator', this.businessHourGenerator);
  			}
  
  			this.view.setDate(this.currentDate);
  		}
  
  		this.thawContentHeight();
  	},
  
  
  	// Unrenders the current view and reflects this change in the Header.
  	// Unregsiters the `view`, but does not remove from viewByType hash.
  	clearView: function() {
  		var currentView = this.view;
  
  		this.toolbarsManager.proxyCall('deactivateButton', currentView.type);
  
  		this.unbindViewHandlers(currentView);
  
  		currentView.removeElement();
  
  		this.view = null;
  	},
  
  
  	// Destroys the view, including the view object. Then, re-instantiates it and renders it.
  	// Maintains the same scroll state.
  	// TODO: maintain any other user-manipulated state.
  	reinitView: function() {
  		var oldView = this.view;
  		var scroll = oldView.queryScroll(); // wouldn't be so complicated if Calendar owned the scroll
  		this.freezeContentHeight();
  
  		this.clearView();
  		this.calcSize();
  		this.renderView(oldView.type); // needs the type to freshly render
  
  		this.view.applyScroll(scroll);
  		this.thawContentHeight();
  	},
  
  
  	// Resizing
  	// -----------------------------------------------------------------------------------
  
  
  	getSuggestedViewHeight: function() {
  		if (this.suggestedViewHeight === null) {
  			this.calcSize();
  		}
  		return this.suggestedViewHeight;
  	},
  
  
  	isHeightAuto: function() {
  		return this.opt('contentHeight') === 'auto' || this.opt('height') === 'auto';
  	},
  
  
  	updateViewSize: function(isResize) {
  		var view = this.view;
  		var scroll;
  
  		if (!this.ignoreUpdateViewSize && view) {
  
  			if (isResize) {
  				this.calcSize();
  				scroll = view.queryScroll();
  			}
  
  			this.ignoreUpdateViewSize++;
  
  			view.updateSize(
  				this.getSuggestedViewHeight(),
  				this.isHeightAuto(),
  				isResize
  			);
  
  			this.ignoreUpdateViewSize--;
  
  			if (isResize) {
  				view.applyScroll(scroll);
  			}
  
  			return true; // signal success
  		}
  	},
  
  
  	calcSize: function() {
  		if (this.elementVisible()) {
  			this._calcSize();
  		}
  	},
  
  
  	_calcSize: function() { // assumes elementVisible
  		var contentHeightInput = this.opt('contentHeight');
  		var heightInput = this.opt('height');
  
  		if (typeof contentHeightInput === 'number') { // exists and not 'auto'
  			this.suggestedViewHeight = contentHeightInput;
  		}
  		else if (typeof contentHeightInput === 'function') { // exists and is a function
  			this.suggestedViewHeight = contentHeightInput();
  		}
  		else if (typeof heightInput === 'number') { // exists and not 'auto'
  			this.suggestedViewHeight = heightInput - this.queryToolbarsHeight();
  		}
  		else if (typeof heightInput === 'function') { // exists and is a function
  			this.suggestedViewHeight = heightInput() - this.queryToolbarsHeight();
  		}
  		else if (heightInput === 'parent') { // set to height of parent element
  			this.suggestedViewHeight = this.el.parent().height() - this.queryToolbarsHeight();
  		}
  		else {
  			this.suggestedViewHeight = Math.round(
  				this.contentEl.width() /
  				Math.max(this.opt('aspectRatio'), .5)
  			);
  		}
  	},
  
  
  	windowResize: function(ev) {
  		if (
  			ev.target === window && // so we don't process jqui "resize" events that have bubbled up
  			this.view &&
  			this.view.isDatesRendered
  		) {
  			if (this.updateViewSize(true)) { // isResize=true, returns true on success
  				this.publiclyTrigger('windowResize', [ this.view ]);
  			}
  		}
  	},
  
  
  	/* Height "Freezing"
  	-----------------------------------------------------------------------------*/
  
  
  	freezeContentHeight: function() {
  		if (!(this.freezeContentHeightDepth++)) {
  			this.forceFreezeContentHeight();
  		}
  	},
  
  
  	forceFreezeContentHeight: function() {
  		this.contentEl.css({
  			width: '100%',
  			height: this.contentEl.height(),
  			overflow: 'hidden'
  		});
  	},
  
  
  	thawContentHeight: function() {
  		this.freezeContentHeightDepth--;
  
  		// always bring back to natural height
  		this.contentEl.css({
  			width: '',
  			height: '',
  			overflow: ''
  		});
  
  		// but if there are future thaws, re-freeze
  		if (this.freezeContentHeightDepth) {
  			this.forceFreezeContentHeight();
  		}
  	}
  
  });
  
  ;;
  
  Calendar.mixin({
  
  	header: null,
  	footer: null,
  	toolbarsManager: null,
  
  
  	initToolbars: function() {
  		this.header = new Toolbar(this, this.computeHeaderOptions());
  		this.footer = new Toolbar(this, this.computeFooterOptions());
  		this.toolbarsManager = new Iterator([ this.header, this.footer ]);
  	},
  
  
  	computeHeaderOptions: function() {
  		return {
  			extraClasses: 'fc-header-toolbar',
  			layout: this.opt('header')
  		};
  	},
  
  
  	computeFooterOptions: function() {
  		return {
  			extraClasses: 'fc-footer-toolbar',
  			layout: this.opt('footer')
  		};
  	},
  
  
  	// can be called repeatedly and Header will rerender
  	renderHeader: function() {
  		var header = this.header;
  
  		header.setToolbarOptions(this.computeHeaderOptions());
  		header.render();
  
  		if (header.el) {
  			this.el.prepend(header.el);
  		}
  	},
  
  
  	// can be called repeatedly and Footer will rerender
  	renderFooter: function() {
  		var footer = this.footer;
  
  		footer.setToolbarOptions(this.computeFooterOptions());
  		footer.render();
  
  		if (footer.el) {
  			this.el.append(footer.el);
  		}
  	},
  
  
  	setToolbarsTitle: function(title) {
  		this.toolbarsManager.proxyCall('updateTitle', title);
  	},
  
  
  	updateToolbarButtons: function(dateProfile) {
  		var now = this.getNow();
  		var view = this.view;
  		var todayInfo = view.buildDateProfile(now);
  		var prevInfo = view.buildPrevDateProfile(this.currentDate);
  		var nextInfo = view.buildNextDateProfile(this.currentDate);
  
  		this.toolbarsManager.proxyCall(
  			(todayInfo.isValid && !dateProfile.currentUnzonedRange.containsDate(now)) ?
  				'enableButton' :
  				'disableButton',
  			'today'
  		);
  
  		this.toolbarsManager.proxyCall(
  			prevInfo.isValid ?
  				'enableButton' :
  				'disableButton',
  			'prev'
  		);
  
  		this.toolbarsManager.proxyCall(
  			nextInfo.isValid ?
  				'enableButton' :
  				'disableButton',
  			'next'
  		);
  	},
  
  
  	queryToolbarsHeight: function() {
  		return this.toolbarsManager.items.reduce(function(accumulator, toolbar) {
  			var toolbarHeight = toolbar.el ? toolbar.el.outerHeight(true) : 0; // includes margin
  			return accumulator + toolbarHeight;
  		}, 0);
  	}
  
  });
  
  ;;
  
  /*
  determines if eventInstanceGroup is allowed,
  in relation to other EVENTS and business hours.
  */
  Calendar.prototype.isEventInstanceGroupAllowed = function(eventInstanceGroup) {
  	var eventDef = eventInstanceGroup.getEventDef();
  	var eventFootprints = this.eventRangesToEventFootprints(eventInstanceGroup.getAllEventRanges());
  	var i;
  
  	var peerEventInstances = this.getPeerEventInstances(eventDef);
  	var peerEventRanges = peerEventInstances.map(eventInstanceToEventRange);
  	var peerEventFootprints = this.eventRangesToEventFootprints(peerEventRanges);
  
  	var constraintVal = eventDef.getConstraint();
  	var overlapVal = eventDef.getOverlap();
  
  	var eventAllowFunc = this.opt('eventAllow');
  
  	for (i = 0; i < eventFootprints.length; i++) {
  		if (
  			!this.isFootprintAllowed(
  				eventFootprints[i].componentFootprint,
  				peerEventFootprints,
  				constraintVal,
  				overlapVal,
  				eventFootprints[i].eventInstance
  			)
  		) {
  			return false;
  		}
  	}
  
  	if (eventAllowFunc) {
  		for (i = 0; i < eventFootprints.length; i++) {
  			if (
  				eventAllowFunc(
  					eventFootprints[i].componentFootprint.toLegacy(this),
  					eventFootprints[i].getEventLegacy()
  				) === false
  			) {
  				return false;
  			}
  		}
  	}
  
  	return true;
  };
  
  
  Calendar.prototype.getPeerEventInstances = function(eventDef) {
  	return this.eventManager.getEventInstancesWithoutId(eventDef.id);
  };
  
  
  Calendar.prototype.isSelectionFootprintAllowed = function(componentFootprint) {
  	var peerEventInstances = this.eventManager.getEventInstances();
  	var peerEventRanges = peerEventInstances.map(eventInstanceToEventRange);
  	var peerEventFootprints = this.eventRangesToEventFootprints(peerEventRanges);
  
  	var selectAllowFunc;
  
  	if (
  		this.isFootprintAllowed(
  			componentFootprint,
  			peerEventFootprints,
  			this.opt('selectConstraint'),
  			this.opt('selectOverlap')
  		)
  	) {
  		selectAllowFunc = this.opt('selectAllow');
  
  		if (selectAllowFunc) {
  			return selectAllowFunc(componentFootprint.toLegacy(this)) !== false;
  		}
  		else {
  			return true;
  		}
  	}
  
  	return false;
  };
  
  
  Calendar.prototype.isFootprintAllowed = function(
  	componentFootprint,
  	peerEventFootprints,
  	constraintVal,
  	overlapVal,
  	subjectEventInstance // optional
  ) {
  	var constraintFootprints; // ComponentFootprint[]
  	var overlapEventFootprints; // EventFootprint[]
  
  	if (constraintVal != null) {
  		constraintFootprints = this.constraintValToFootprints(constraintVal, componentFootprint.isAllDay);
  
  		if (!this.isFootprintWithinConstraints(componentFootprint, constraintFootprints)) {
  			return false;
  		}
  	}
  
  	overlapEventFootprints = this.collectOverlapEventFootprints(peerEventFootprints, componentFootprint);
  
  	if (overlapVal === false) {
  		if (overlapEventFootprints.length) {
  			return false;
  		}
  	}
  	else if (typeof overlapVal === 'function') {
  		if (!isOverlapsAllowedByFunc(overlapEventFootprints, overlapVal, subjectEventInstance)) {
  			return false;
  		}
  	}
  
  	if (subjectEventInstance) {
  		if (!isOverlapEventInstancesAllowed(overlapEventFootprints, subjectEventInstance)) {
  			return false;
  		}
  	}
  
  	return true;
  };
  
  
  // Constraint
  // ------------------------------------------------------------------------------------------------
  
  
  Calendar.prototype.isFootprintWithinConstraints = function(componentFootprint, constraintFootprints) {
  	var i;
  
  	for (i = 0; i < constraintFootprints.length; i++) {
  		if (this.footprintContainsFootprint(constraintFootprints[i], componentFootprint)) {
  			return true;
  		}
  	}
  
  	return false;
  };
  
  
  Calendar.prototype.constraintValToFootprints = function(constraintVal, isAllDay) {
  	var eventInstances;
  
  	if (constraintVal === 'businessHours') {
  		return this.buildCurrentBusinessFootprints(isAllDay);
  	}
  	else if (typeof constraintVal === 'object') {
  		eventInstances = this.parseEventDefToInstances(constraintVal); // handles recurring events
  
  		if (!eventInstances) { // invalid input. fallback to parsing footprint directly
  			return this.parseFootprints(constraintVal);
  		}
  		else {
  			return this.eventInstancesToFootprints(eventInstances);
  		}
  	}
  	else if (constraintVal != null) { // an ID
  		eventInstances = this.eventManager.getEventInstancesWithId(constraintVal);
  
  		return this.eventInstancesToFootprints(eventInstances);
  	}
  };
  
  
  // returns ComponentFootprint[]
  // uses current view's range
  Calendar.prototype.buildCurrentBusinessFootprints = function(isAllDay) {
  	var view = this.view;
  	var businessHourGenerator = view.get('businessHourGenerator');
  	var unzonedRange = view.dateProfile.activeUnzonedRange;
  	var eventInstanceGroup = businessHourGenerator.buildEventInstanceGroup(isAllDay, unzonedRange);
  
  	if (eventInstanceGroup) {
  		return this.eventInstancesToFootprints(eventInstanceGroup.eventInstances);
  	}
  	else {
  		return [];
  	}
  };
  
  
  // conversion util
  Calendar.prototype.eventInstancesToFootprints = function(eventInstances) {
  	var eventRanges = eventInstances.map(eventInstanceToEventRange);
  	var eventFootprints = this.eventRangesToEventFootprints(eventRanges);
  
  	return eventFootprints.map(eventFootprintToComponentFootprint);
  };
  
  
  // Overlap
  // ------------------------------------------------------------------------------------------------
  
  
  Calendar.prototype.collectOverlapEventFootprints = function(peerEventFootprints, targetFootprint) {
  	var overlapEventFootprints = [];
  	var i;
  
  	for (i = 0; i < peerEventFootprints.length; i++) {
  		if (
  			this.footprintsIntersect(
  				targetFootprint,
  				peerEventFootprints[i].componentFootprint
  			)
  		) {
  			overlapEventFootprints.push(peerEventFootprints[i]);
  		}
  	}
  
  	return overlapEventFootprints;
  };
  
  
  // optional subjectEventInstance
  function isOverlapsAllowedByFunc(overlapEventFootprints, overlapFunc, subjectEventInstance) {
  	var i;
  
  	for (i = 0; i < overlapEventFootprints.length; i++) {
  		if (
  			!overlapFunc(
  				overlapEventFootprints[i].eventInstance.toLegacy(),
  				subjectEventInstance ? subjectEventInstance.toLegacy() : null
  			)
  		) {
  			return false;
  		}
  	}
  
  	return true;
  }
  
  
  function isOverlapEventInstancesAllowed(overlapEventFootprints, subjectEventInstance) {
  	var subjectLegacyInstance = subjectEventInstance.toLegacy();
  	var i;
  	var overlapEventInstance;
  	var overlapEventDef;
  	var overlapVal;
  
  	for (i = 0; i < overlapEventFootprints.length; i++) {
  		overlapEventInstance = overlapEventFootprints[i].eventInstance;
  		overlapEventDef = overlapEventInstance.def;
  
  		// don't need to pass in calendar, because don't want to consider global eventOverlap property,
  		// because we already considered that earlier in the process.
  		overlapVal = overlapEventDef.getOverlap();
  
  		if (overlapVal === false) {
  			return false;
  		}
  		else if (typeof overlapVal === 'function') {
  			if (
  				!overlapVal(
  					overlapEventInstance.toLegacy(),
  					subjectLegacyInstance
  				)
  			) {
  				return false;
  			}
  		}
  	}
  
  	return true;
  }
  
  
  // Conversion: eventDefs -> eventInstances -> eventRanges -> eventFootprints -> componentFootprints
  // ------------------------------------------------------------------------------------------------
  // NOTE: this might seem like repetitive code with the Grid class, however, this code is related to
  // constraints whereas the Grid code is related to rendering. Each approach might want to convert
  // eventRanges -> eventFootprints in a different way. Regardless, there are opportunities to make
  // this more DRY.
  
  
  /*
  Returns false on invalid input.
  */
  Calendar.prototype.parseEventDefToInstances = function(eventInput) {
  	var eventManager = this.eventManager;
  	var eventDef = EventDefParser.parse(eventInput, new EventSource(this));
  
  	if (!eventDef) { // invalid
  		return false;
  	}
  
  	return eventDef.buildInstances(eventManager.currentPeriod.unzonedRange);
  };
  
  
  Calendar.prototype.eventRangesToEventFootprints = function(eventRanges) {
  	var i;
  	var eventFootprints = [];
  
  	for (i = 0; i < eventRanges.length; i++) {
  		eventFootprints.push.apply( // footprints
  			eventFootprints,
  			this.eventRangeToEventFootprints(eventRanges[i])
  		);
  	}
  
  	return eventFootprints;
  };
  
  
  Calendar.prototype.eventRangeToEventFootprints = function(eventRange) {
  	return [ eventRangeToEventFootprint(eventRange) ];
  };
  
  
  /*
  Parses footprints directly.
  Very similar to EventDateProfile::parse :(
  */
  Calendar.prototype.parseFootprints = function(rawInput) {
  	var start, end;
  
  	if (rawInput.start) {
  		start = this.moment(rawInput.start);
  
  		if (!start.isValid()) {
  			start = null;
  		}
  	}
  
  	if (rawInput.end) {
  		end = this.moment(rawInput.end);
  
  		if (!end.isValid()) {
  			end = null;
  		}
  	}
  
  	return [
  		new ComponentFootprint(
  			new UnzonedRange(start, end),
  			(start && !start.hasTime()) || (end && !end.hasTime()) // isAllDay
  		)
  	];
  };
  
  
  // Footprint Utils
  // ----------------------------------------------------------------------------------------
  
  
  Calendar.prototype.footprintContainsFootprint = function(outerFootprint, innerFootprint) {
  	return outerFootprint.unzonedRange.containsRange(innerFootprint.unzonedRange);
  };
  
  
  Calendar.prototype.footprintsIntersect = function(footprint0, footprint1) {
  	return footprint0.unzonedRange.intersectsWith(footprint1.unzonedRange);
  };
  
  ;;
  
  Calendar.mixin({
  
  	// Sources
  	// ------------------------------------------------------------------------------------
  
  
  	getEventSources: function() {
  		return this.eventManager.otherSources.slice(); // clone
  	},
  
  
  	getEventSourceById: function(id) {
  		return this.eventManager.getSourceById(
  			EventSource.normalizeId(id)
  		);
  	},
  
  
  	addEventSource: function(sourceInput) {
  		var source = EventSourceParser.parse(sourceInput, this);
  
  		if (source) {
  			this.eventManager.addSource(source);
  		}
  	},
  
  
  	removeEventSources: function(sourceMultiQuery) {
  		var eventManager = this.eventManager;
  		var sources;
  		var i;
  
  		if (sourceMultiQuery == null) {
  			this.eventManager.removeAllSources();
  		}
  		else {
  			sources = eventManager.multiQuerySources(sourceMultiQuery);
  
  			eventManager.freeze();
  
  			for (i = 0; i < sources.length; i++) {
  				eventManager.removeSource(sources[i]);
  			}
  
  			eventManager.thaw();
  		}
  	},
  
  
  	removeEventSource: function(sourceQuery) {
  		var eventManager = this.eventManager;
  		var sources = eventManager.querySources(sourceQuery);
  		var i;
  
  		eventManager.freeze();
  
  		for (i = 0; i < sources.length; i++) {
  			eventManager.removeSource(sources[i]);
  		}
  
  		eventManager.thaw();
  	},
  
  
  	refetchEventSources: function(sourceMultiQuery) {
  		var eventManager = this.eventManager;
  		var sources = eventManager.multiQuerySources(sourceMultiQuery);
  		var i;
  
  		eventManager.freeze();
  
  		for (i = 0; i < sources.length; i++) {
  			eventManager.refetchSource(sources[i]);
  		}
  
  		eventManager.thaw();
  	},
  
  
  	// Events
  	// ------------------------------------------------------------------------------------
  
  
  	refetchEvents: function() {
  		this.eventManager.refetchAllSources();
  	},
  
  
  	renderEvents: function(eventInputs, isSticky) {
  		this.eventManager.freeze();
  
  		for (var i = 0; i < eventInputs.length; i++) {
  			this.renderEvent(eventInputs[i], isSticky);
  		}
  
  		this.eventManager.thaw();
  	},
  
  
  	renderEvent: function(eventInput, isSticky) {
  		var eventManager = this.eventManager;
  		var eventDef = EventDefParser.parse(
  			eventInput,
  			eventInput.source || eventManager.stickySource
  		);
  
  		if (eventDef) {
  			eventManager.addEventDef(eventDef, isSticky);
  		}
  	},
  
  
  	// legacyQuery operates on legacy event instance objects
  	removeEvents: function(legacyQuery) {
  		var eventManager = this.eventManager;
  		var legacyInstances = [];
  		var idMap = {};
  		var eventDef;
  		var i;
  
  		if (legacyQuery == null) { // shortcut for removing all
  			eventManager.removeAllEventDefs(true); // persist=true
  		}
  		else {
  			eventManager.getEventInstances().forEach(function(eventInstance) {
  				legacyInstances.push(eventInstance.toLegacy());
  			});
  
  			legacyInstances = filterLegacyEventInstances(legacyInstances, legacyQuery);
  
  			// compute unique IDs
  			for (i = 0; i < legacyInstances.length; i++) {
  				eventDef = this.eventManager.getEventDefByUid(legacyInstances[i]._id);
  				idMap[eventDef.id] = true;
  			}
  
  			eventManager.freeze();
  
  			for (i in idMap) { // reuse `i` as an "id"
  				eventManager.removeEventDefsById(i, true); // persist=true
  			}
  
  			eventManager.thaw();
  		}
  	},
  
  
  	// legacyQuery operates on legacy event instance objects
  	clientEvents: function(legacyQuery) {
  		var legacyEventInstances = [];
  
  		this.eventManager.getEventInstances().forEach(function(eventInstance) {
  			legacyEventInstances.push(eventInstance.toLegacy());
  		});
  
  		return filterLegacyEventInstances(legacyEventInstances, legacyQuery);
  	},
  
  
  	updateEvents: function(eventPropsArray) {
  		this.eventManager.freeze();
  
  		for (var i = 0; i < eventPropsArray.length; i++) {
  			this.updateEvent(eventPropsArray[i]);
  		}
  
  		this.eventManager.thaw();
  	},
  
  
  	updateEvent: function(eventProps) {
  		var eventDef = this.eventManager.getEventDefByUid(eventProps._id);
  		var eventInstance;
  		var eventDefMutation;
  
  		if (eventDef instanceof SingleEventDef) {
  			eventInstance = eventDef.buildInstance();
  
  			eventDefMutation = EventDefMutation.createFromRawProps(
  				eventInstance,
  				eventProps, // raw props
  				null // largeUnit -- who uses it?
  			);
  
  			this.eventManager.mutateEventsWithId(eventDef.id, eventDefMutation); // will release
  		}
  	}
  
  });
  
  
  function filterLegacyEventInstances(legacyEventInstances, legacyQuery) {
  	if (legacyQuery == null) {
  		return legacyEventInstances;
  	}
  	else if ($.isFunction(legacyQuery)) {
  		return legacyEventInstances.filter(legacyQuery);
  	}
  	else { // an event ID
  		legacyQuery += ''; // normalize to string
  
  		return legacyEventInstances.filter(function(legacyEventInstance) {
  			// soft comparison because id not be normalized to string
  			return legacyEventInstance.id == legacyQuery ||
  				legacyEventInstance._id === legacyQuery; // can specify internal id, but must exactly match
  		});
  	}
  }
  
  ;;
  
  Calendar.defaults = {
  
  	titleRangeSeparator: ' \u2013 ', // en dash
  	monthYearFormat: 'MMMM YYYY', // required for en. other locales rely on datepicker computable option
  
  	defaultTimedEventDuration: '02:00:00',
  	defaultAllDayEventDuration: { days: 1 },
  	forceEventDuration: false,
  	nextDayThreshold: '09:00:00', // 9am
  
  	// display
  	columnHeader: true,
  	defaultView: 'month',
  	aspectRatio: 1.35,
  	header: {
  		left: 'title',
  		center: '',
  		right: 'today prev,next'
  	},
  	weekends: true,
  	weekNumbers: false,
  
  	weekNumberTitle: 'W',
  	weekNumberCalculation: 'local',
  	
  	//editable: false,
  
  	//nowIndicator: false,
  
  	scrollTime: '06:00:00',
  	minTime: '00:00:00',
  	maxTime: '24:00:00',
  	showNonCurrentDates: true,
  	
  	// 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: null,
  
  	allDayText: 'all-day',
  
  	// allows setting a min-height to the event segment to prevent short events overlapping each other
  	agendaEventMinHeight: 0,
  	
  	// jquery-ui theming
  	theme: false,
  	//themeButtonIcons: null,
  
  	//eventResizableFromStart: false,
  	dragOpacity: .75,
  	dragRevertDuration: 500,
  	dragScroll: true,
  	
  	//selectable: false,
  	unselectAuto: true,
  	//selectMinDistance: 0,
  	
  	dropAccept: '*',
  
  	eventOrder: 'title',
  	//eventRenderWait: null,
  
  	eventLimit: false,
  	eventLimitText: 'more',
  	eventLimitClick: 'popover',
  	dayPopoverFormat: 'LL',
  	
  	handleWindowResize: true,
  	windowResizeDelay: 100, // milliseconds before an updateSize happens
  
  	longPressDelay: 1000
  	
  };
  
  
  Calendar.englishDefaults = { // used by locale.js
  	dayPopoverFormat: 'dddd, MMMM D'
  };
  
  
  Calendar.rtlDefaults = { // right-to-left defaults
  	header: { // TODO: smarter solution (first/center/last ?)
  		left: 'next,prev today',
  		center: '',
  		right: 'title'
  	},
  	buttonIcons: {
  		prev: 'right-single-arrow',
  		next: 'left-single-arrow',
  		prevYear: 'right-double-arrow',
  		nextYear: 'left-double-arrow'
  	},
  	themeButtonIcons: {
  		prev: 'circle-triangle-e',
  		next: 'circle-triangle-w',
  		nextYear: 'seek-prev',
  		prevYear: 'seek-next'
  	}
  };
  
  ;;
  
  var localeOptionHash = FC.locales = {}; // initialize and expose
  
  
  // TODO: document the structure and ordering of a FullCalendar locale file
  
  
  // Initialize jQuery UI datepicker translations while using some of the translations
  // Will set this as the default locales for datepicker.
  FC.datepickerLocale = function(localeCode, dpLocaleCode, dpOptions) {
  
  	// get the FullCalendar internal option hash for this locale. create if necessary
  	var fcOptions = localeOptionHash[localeCode] || (localeOptionHash[localeCode] = {});
  
  	// transfer some simple options from datepicker to fc
  	fcOptions.isRTL = dpOptions.isRTL;
  	fcOptions.weekNumberTitle = dpOptions.weekHeader;
  
  	// compute some more complex options from datepicker
  	$.each(dpComputableOptions, function(name, func) {
  		fcOptions[name] = func(dpOptions);
  	});
  
  	// is jQuery UI Datepicker is on the page?
  	if ($.datepicker) {
  
  		// Register the locale data.
  		// FullCalendar and MomentJS use locale codes like "pt-br" but Datepicker
  		// does it like "pt-BR" or if it doesn't have the locale, maybe just "pt".
  		// Make an alias so the locale can be referenced either way.
  		$.datepicker.regional[dpLocaleCode] =
  			$.datepicker.regional[localeCode] = // alias
  				dpOptions;
  
  		// Alias 'en' to the default locale data. Do this every time.
  		$.datepicker.regional.en = $.datepicker.regional[''];
  
  		// Set as Datepicker's global defaults.
  		$.datepicker.setDefaults(dpOptions);
  	}
  };
  
  
  // Sets FullCalendar-specific translations. Will set the locales as the global default.
  FC.locale = function(localeCode, newFcOptions) {
  	var fcOptions;
  	var momOptions;
  
  	// get the FullCalendar internal option hash for this locale. create if necessary
  	fcOptions = localeOptionHash[localeCode] || (localeOptionHash[localeCode] = {});
  
  	// provided new options for this locales? merge them in
  	if (newFcOptions) {
  		fcOptions = localeOptionHash[localeCode] = mergeOptions([ fcOptions, newFcOptions ]);
  	}
  
  	// compute locale options that weren't defined.
  	// always do this. newFcOptions can be undefined when initializing from i18n file,
  	// so no way to tell if this is an initialization or a default-setting.
  	momOptions = getMomentLocaleData(localeCode); // will fall back to en
  	$.each(momComputableOptions, function(name, func) {
  		if (fcOptions[name] == null) {
  			fcOptions[name] = func(momOptions, fcOptions);
  		}
  	});
  
  	// set it as the default locale for FullCalendar
  	Calendar.defaults.locale = localeCode;
  };
  
  
  // NOTE: can't guarantee any of these computations will run because not every locale has datepicker
  // configs, so make sure there are English fallbacks for these in the defaults file.
  var dpComputableOptions = {
  
  	buttonText: function(dpOptions) {
  		return {
  			// the translations sometimes wrongly contain HTML entities
  			prev: stripHtmlEntities(dpOptions.prevText),
  			next: stripHtmlEntities(dpOptions.nextText),
  			today: stripHtmlEntities(dpOptions.currentText)
  		};
  	},
  
  	// Produces format strings like "MMMM YYYY" -> "September 2014"
  	monthYearFormat: function(dpOptions) {
  		return dpOptions.showMonthAfterYear ?
  			'YYYY[' + dpOptions.yearSuffix + '] MMMM' :
  			'MMMM YYYY[' + dpOptions.yearSuffix + ']';
  	}
  
  };
  
  var momComputableOptions = {
  
  	// Produces format strings like "ddd M/D" -> "Fri 9/15"
  	dayOfMonthFormat: function(momOptions, fcOptions) {
  		var format = momOptions.longDateFormat('l'); // for the format like "M/D/YYYY"
  
  		// strip the year off the edge, as well as other misc non-whitespace chars
  		format = format.replace(/^Y+[^\w\s]*|[^\w\s]*Y+$/g, '');
  
  		if (fcOptions.isRTL) {
  			format += ' ddd'; // for RTL, add day-of-week to end
  		}
  		else {
  			format = 'ddd ' + format; // for LTR, add day-of-week to beginning
  		}
  		return format;
  	},
  
  	// Produces format strings like "h:mma" -> "6:00pm"
  	mediumTimeFormat: function(momOptions) { // can't be called `timeFormat` because collides with option
  		return momOptions.longDateFormat('LT')
  			.replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
  	},
  
  	// Produces format strings like "h(:mm)a" -> "6pm" / "6:30pm"
  	smallTimeFormat: function(momOptions) {
  		return momOptions.longDateFormat('LT')
  			.replace(':mm', '(:mm)')
  			.replace(/(\Wmm)$/, '($1)') // like above, but for foreign locales
  			.replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
  	},
  
  	// Produces format strings like "h(:mm)t" -> "6p" / "6:30p"
  	extraSmallTimeFormat: function(momOptions) {
  		return momOptions.longDateFormat('LT')
  			.replace(':mm', '(:mm)')
  			.replace(/(\Wmm)$/, '($1)') // like above, but for foreign locales
  			.replace(/\s*a$/i, 't'); // convert to AM/PM/am/pm to lowercase one-letter. remove any spaces beforehand
  	},
  
  	// Produces format strings like "ha" / "H" -> "6pm" / "18"
  	hourFormat: function(momOptions) {
  		return momOptions.longDateFormat('LT')
  			.replace(':mm', '')
  			.replace(/(\Wmm)$/, '') // like above, but for foreign locales
  			.replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
  	},
  
  	// Produces format strings like "h:mm" -> "6:30" (with no AM/PM)
  	noMeridiemTimeFormat: function(momOptions) {
  		return momOptions.longDateFormat('LT')
  			.replace(/\s*a$/i, ''); // remove trailing AM/PM
  	}
  
  };
  
  
  // options that should be computed off live calendar options (considers override options)
  // TODO: best place for this? related to locale?
  // TODO: flipping text based on isRTL is a bad idea because the CSS `direction` might want to handle it
  var instanceComputableOptions = {
  
  	// Produces format strings for results like "Mo 16"
  	smallDayDateFormat: function(options) {
  		return options.isRTL ?
  			'D dd' :
  			'dd D';
  	},
  
  	// Produces format strings for results like "Wk 5"
  	weekFormat: function(options) {
  		return options.isRTL ?
  			'w[ ' + options.weekNumberTitle + ']' :
  			'[' + options.weekNumberTitle + ' ]w';
  	},
  
  	// Produces format strings for results like "Wk5"
  	smallWeekFormat: function(options) {
  		return options.isRTL ?
  			'w[' + options.weekNumberTitle + ']' :
  			'[' + options.weekNumberTitle + ']w';
  	}
  
  };
  
  // TODO: make these computable properties in optionsModel
  function populateInstanceComputableOptions(options) {
  	$.each(instanceComputableOptions, function(name, func) {
  		if (options[name] == null) {
  			options[name] = func(options);
  		}
  	});
  }
  
  
  // Returns moment's internal locale data. If doesn't exist, returns English.
  function getMomentLocaleData(localeCode) {
  	return moment.localeData(localeCode) || moment.localeData('en');
  }
  
  
  // Initialize English by forcing computation of moment-derived options.
  // Also, sets it as the default.
  FC.locale('en', Calendar.englishDefaults);
  
  ;;
  
  var UnzonedRange = FC.UnzonedRange = Class.extend({
  
  	startMs: null, // if null, no start constraint
  	endMs: null, // if null, no end constraint
  
  	// TODO: move these into footprint.
  	// Especially, doesn't make sense for null startMs/endMs.
  	isStart: true,
  	isEnd: true,
  
  	constructor: function(startInput, endInput) {
  
  		if (moment.isMoment(startInput)) {
  			startInput = startInput.clone().stripZone();
  		}
  
  		if (moment.isMoment(endInput)) {
  			endInput = endInput.clone().stripZone();
  		}
  
  		if (startInput) {
  			this.startMs = startInput.valueOf();
  		}
  
  		if (endInput) {
  			this.endMs = endInput.valueOf();
  		}
  	},
  
  	intersect: function(otherRange) {
  		var startMs = this.startMs;
  		var endMs = this.endMs;
  		var newRange = null;
  
  		if (otherRange.startMs !== null) {
  			if (startMs === null) {
  				startMs = otherRange.startMs;
  			}
  			else {
  				startMs = Math.max(startMs, otherRange.startMs);
  			}
  		}
  
  		if (otherRange.endMs !== null) {
  			if (endMs === null) {
  				endMs = otherRange.endMs;
  			}
  			else {
  				endMs = Math.min(endMs, otherRange.endMs);
  			}
  		}
  
  		if (startMs === null || endMs === null || startMs < endMs) {
  			newRange = new UnzonedRange(startMs, endMs);
  			newRange.isStart = this.isStart && startMs === this.startMs;
  			newRange.isEnd = this.isEnd && endMs === this.endMs;
  		}
  
  		return newRange;
  	},
  
  
  	intersectsWith: function(otherRange) {
  		return (this.endMs === null || otherRange.startMs === null || this.endMs > otherRange.startMs) &&
  			(this.startMs === null || otherRange.endMs === null || this.startMs < otherRange.endMs);
  	},
  
  
  	containsRange: function(innerRange) {
  		return (this.startMs === null || (innerRange.startMs !== null && innerRange.startMs >= this.startMs)) &&
  			(this.endMs === null || (innerRange.endMs !== null && innerRange.endMs <= this.endMs));
  	},
  
  
  	// `date` can be a moment, a Date, or a millisecond time.
  	containsDate: function(date) {
  		var ms = date.valueOf();
  
  		return (this.startMs === null || ms >= this.startMs) &&
  			(this.endMs === null || ms < this.endMs);
  	},
  
  
  	// If the given date is not within the given range, move it inside.
  	// (If it's past the end, make it one millisecond before the end).
  	// `date` can be a moment, a Date, or a millisecond time.
  	// Returns a MS-time.
  	constrainDate: function(date) {
  		var ms = date.valueOf();
  
  		if (this.startMs !== null && ms < this.startMs) {
  			ms = this.startMs;
  		}
  
  		if (this.endMs !== null && ms >= this.endMs) {
  			ms = this.endMs - 1;
  		}
  
  		return ms;
  	},
  
  
  	equals: function(otherRange) {
  		return this.startMs === otherRange.startMs && this.endMs === otherRange.endMs;
  	},
  
  
  	clone: function() {
  		var range = new UnzonedRange(this.startMs, this.endMs);
  
  		range.isStart = this.isStart;
  		range.isEnd = this.isEnd;
  
  		return range;
  	},
  
  
  	// Returns an ambig-zoned moment from startMs.
  	// BEWARE: returned moment is not localized.
  	// Formatting and start-of-week will be default.
  	getStart: function() {
  		if (this.startMs !== null) {
  			return FC.moment.utc(this.startMs).stripZone();
  		}
  	},
  
  	// Returns an ambig-zoned moment from startMs.
  	// BEWARE: returned moment is not localized.
  	// Formatting and start-of-week will be default.
  	getEnd: function() {
  		if (this.endMs !== null) {
  			return FC.moment.utc(this.endMs).stripZone();
  		}
  	},
  
  
  	as: function(unit) {
  		return moment.utc(this.endMs).diff(
  			moment.utc(this.startMs),
  			unit,
  			true
  		);
  	}
  
  });
  
  
  /*
  SIDEEFFECT: will mutate eventRanges.
  Will return a new array result.
  Only works for non-open-ended ranges.
  */
  function invertUnzonedRanges(ranges, constraintRange) {
  	var invertedRanges = [];
  	var startMs = constraintRange.startMs; // the end of the previous range. the start of the new range
  	var i;
  	var dateRange;
  
  	// ranges need to be in order. required for our date-walking algorithm
  	ranges.sort(compareUnzonedRanges);
  
  	for (i = 0; i < ranges.length; i++) {
  		dateRange = ranges[i];
  
  		// add the span of time before the event (if there is any)
  		if (dateRange.startMs > startMs) { // compare millisecond time (skip any ambig logic)
  			invertedRanges.push(
  				new UnzonedRange(startMs, dateRange.startMs)
  			);
  		}
  
  		if (dateRange.endMs > startMs) {
  			startMs = dateRange.endMs;
  		}
  	}
  
  	// add the span of time after the last event (if there is any)
  	if (startMs < constraintRange.endMs) { // compare millisecond time (skip any ambig logic)
  		invertedRanges.push(
  			new UnzonedRange(startMs, constraintRange.endMs)
  		);
  	}
  
  	return invertedRanges;
  }
  
  
  /*
  Only works for non-open-ended ranges.
  */
  function compareUnzonedRanges(range1, range2) {
  	return range1.startMs - range2.startMs; // earlier ranges go first
  }
  
  ;;
  
  /*
  Meant to be immutable
  */
  var ComponentFootprint = FC.ComponentFootprint = Class.extend({
  
  	unzonedRange: null,
  	isAllDay: false, // component can choose to ignore this
  
  
  	constructor: function(unzonedRange, isAllDay) {
  		this.unzonedRange = unzonedRange;
  		this.isAllDay = isAllDay;
  	},
  
  
  	/*
  	Only works for non-open-ended ranges.
  	*/
  	toLegacy: function(calendar) {
  		return {
  			start: calendar.msToMoment(this.unzonedRange.startMs, this.isAllDay),
  			end: calendar.msToMoment(this.unzonedRange.endMs, this.isAllDay)
  		};
  	}
  
  });
  
  ;;
  
  var EventPeriod = Class.extend(EmitterMixin, {
  
  	start: null,
  	end: null,
  	timezone: null,
  
  	unzonedRange: null,
  
  	requestsByUid: null,
  	pendingCnt: 0,
  
  	freezeDepth: 0,
  	stuntedReleaseCnt: 0,
  	releaseCnt: 0,
  
  	eventDefsByUid: null,
  	eventDefsById: null,
  	eventInstanceGroupsById: null,
  
  
  	constructor: function(start, end, timezone) {
  		this.start = start;
  		this.end = end;
  		this.timezone = timezone;
  
  		this.unzonedRange = new UnzonedRange(
  			start.clone().stripZone(),
  			end.clone().stripZone()
  		);
  
  		this.requestsByUid = {};
  		this.eventDefsByUid = {};
  		this.eventDefsById = {};
  		this.eventInstanceGroupsById = {};
  	},
  
  
  	isWithinRange: function(start, end) {
  		// TODO: use a range util function?
  		return !start.isBefore(this.start) && !end.isAfter(this.end);
  	},
  
  
  	// Requesting and Purging
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	requestSources: function(sources) {
  		this.freeze();
  
  		for (var i = 0; i < sources.length; i++) {
  			this.requestSource(sources[i]);
  		}
  
  		this.thaw();
  	},
  
  
  	requestSource: function(source) {
  		var _this = this;
  		var request = { source: source, status: 'pending' };
  
  		this.requestsByUid[source.uid] = request;
  		this.pendingCnt += 1;
  
  		source.fetch(this.start, this.end, this.timezone).then(function(eventDefs) {
  			if (request.status !== 'cancelled') {
  				request.status = 'completed';
  				request.eventDefs = eventDefs;
  
  				_this.addEventDefs(eventDefs);
  				_this.pendingCnt--;
  				_this.tryRelease();
  			}
  		}, function() { // failure
  			if (request.status !== 'cancelled') {
  				request.status = 'failed';
  
  				_this.pendingCnt--;
  				_this.tryRelease();
  			}
  		});
  	},
  
  
  	purgeSource: function(source) {
  		var request = this.requestsByUid[source.uid];
  
  		if (request) {
  			delete this.requestsByUid[source.uid];
  
  			if (request.status === 'pending') {
  				request.status = 'cancelled';
  				this.pendingCnt--;
  				this.tryRelease();
  			}
  			else if (request.status === 'completed') {
  				request.eventDefs.forEach(this.removeEventDef.bind(this));
  			}
  		}
  	},
  
  
  	purgeAllSources: function() {
  		var requestsByUid = this.requestsByUid;
  		var uid, request;
  		var completedCnt = 0;
  
  		for (uid in requestsByUid) {
  			request = requestsByUid[uid];
  
  			if (request.status === 'pending') {
  				request.status = 'cancelled';
  			}
  			else if (request.status === 'completed') {
  				completedCnt++;
  			}
  		}
  
  		this.requestsByUid = {};
  		this.pendingCnt = 0;
  
  		if (completedCnt) {
  			this.removeAllEventDefs(); // might release
  		}
  	},
  
  
  	// Event Definitions
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	getEventDefByUid: function(eventDefUid) {
  		return this.eventDefsByUid[eventDefUid];
  	},
  
  
  	getEventDefsById: function(eventDefId) {
  		var a = this.eventDefsById[eventDefId];
  
  		if (a) {
  			return a.slice(); // clone
  		}
  
  		return [];
  	},
  
  
  	addEventDefs: function(eventDefs) {
  		for (var i = 0; i < eventDefs.length; i++) {
  			this.addEventDef(eventDefs[i]);
  		}
  	},
  
  
  	addEventDef: function(eventDef) {
  		var eventDefsById = this.eventDefsById;
  		var eventDefId = eventDef.id;
  		var eventDefs = eventDefsById[eventDefId] || (eventDefsById[eventDefId] = []);
  		var eventInstances = eventDef.buildInstances(this.unzonedRange);
  		var i;
  
  		eventDefs.push(eventDef);
  
  		this.eventDefsByUid[eventDef.uid] = eventDef;
  
  		for (i = 0; i < eventInstances.length; i++) {
  			this.addEventInstance(eventInstances[i], eventDefId);
  		}
  	},
  
  
  	removeEventDefsById: function(eventDefId) {
  		var _this = this;
  
  		this.getEventDefsById(eventDefId).forEach(function(eventDef) {
  			_this.removeEventDef(eventDef);
  		});
  	},
  
  
  	removeAllEventDefs: function() {
  		var isEmpty = $.isEmptyObject(this.eventDefsByUid);
  
  		this.eventDefsByUid = {};
  		this.eventDefsById = {};
  		this.eventInstanceGroupsById = {};
  
  		if (!isEmpty) {
  			this.tryRelease();
  		}
  	},
  
  
  	removeEventDef: function(eventDef) {
  		var eventDefsById = this.eventDefsById;
  		var eventDefs = eventDefsById[eventDef.id];
  
  		delete this.eventDefsByUid[eventDef.uid];
  
  		if (eventDefs) {
  			removeExact(eventDefs, eventDef);
  
  			if (!eventDefs.length) {
  				delete eventDefsById[eventDef.id];
  			}
  
  			this.removeEventInstancesForDef(eventDef);
  		}
  	},
  
  
  	// Event Instances
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	getEventInstances: function() { // TODO: consider iterator
  		var eventInstanceGroupsById = this.eventInstanceGroupsById;
  		var eventInstances = [];
  		var id;
  
  		for (id in eventInstanceGroupsById) {
  			eventInstances.push.apply(eventInstances, // append
  				eventInstanceGroupsById[id].eventInstances
  			);
  		}
  
  		return eventInstances;
  	},
  
  
  	getEventInstancesWithId: function(eventDefId) {
  		var eventInstanceGroup = this.eventInstanceGroupsById[eventDefId];
  
  		if (eventInstanceGroup) {
  			return eventInstanceGroup.eventInstances.slice(); // clone
  		}
  
  		return [];
  	},
  
  
  	getEventInstancesWithoutId: function(eventDefId) { // TODO: consider iterator
  		var eventInstanceGroupsById = this.eventInstanceGroupsById;
  		var matchingInstances = [];
  		var id;
  
  		for (id in eventInstanceGroupsById) {
  			if (id !== eventDefId) {
  				matchingInstances.push.apply(matchingInstances, // append
  					eventInstanceGroupsById[id].eventInstances
  				);
  			}
  		}
  
  		return matchingInstances;
  	},
  
  
  	addEventInstance: function(eventInstance, eventDefId) {
  		var eventInstanceGroupsById = this.eventInstanceGroupsById;
  		var eventInstanceGroup = eventInstanceGroupsById[eventDefId] ||
  			(eventInstanceGroupsById[eventDefId] = new EventInstanceGroup());
  
  		eventInstanceGroup.eventInstances.push(eventInstance);
  
  		this.tryRelease();
  	},
  
  
  	removeEventInstancesForDef: function(eventDef) {
  		var eventInstanceGroupsById = this.eventInstanceGroupsById;
  		var eventInstanceGroup = eventInstanceGroupsById[eventDef.id];
  		var removeCnt;
  
  		if (eventInstanceGroup) {
  			removeCnt = removeMatching(eventInstanceGroup.eventInstances, function(currentEventInstance) {
  				return currentEventInstance.def === eventDef;
  			});
  
  			if (!eventInstanceGroup.eventInstances.length) {
  				delete eventInstanceGroupsById[eventDef.id];
  			}
  
  			if (removeCnt) {
  				this.tryRelease();
  			}
  		}
  	},
  
  
  	// Releasing and Freezing
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	tryRelease: function() {
  		if (!this.pendingCnt) {
  			if (!this.freezeDepth) {
  				this.release();
  			}
  			else {
  				this.stuntedReleaseCnt++;
  			}
  		}
  	},
  
  
  	release: function() {
  		this.releaseCnt++;
  		this.trigger('release', this.eventInstanceGroupsById);
  	},
  
  
  	whenReleased: function() {
  		var _this = this;
  
  		if (this.releaseCnt) {
  			return Promise.resolve(this.eventInstanceGroupsById);
  		}
  		else {
  			return Promise.construct(function(onResolve) {
  				_this.one('release', onResolve);
  			});
  		}
  	},
  
  
  	freeze: function() {
  		if (!(this.freezeDepth++)) {
  			this.stuntedReleaseCnt = 0;
  		}
  	},
  
  
  	thaw: function() {
  		if (!(--this.freezeDepth) && this.stuntedReleaseCnt && !this.pendingCnt) {
  			this.release();
  		}
  	}
  
  });
  
  ;;
  
  var EventManager = Class.extend(EmitterMixin, ListenerMixin, {
  
  	currentPeriod: null,
  
  	calendar: null,
  	stickySource: null,
  	otherSources: null, // does not include sticky source
  
  
  	constructor: function(calendar) {
  		this.calendar = calendar;
  		this.stickySource = new ArrayEventSource(calendar);
  		this.otherSources = [];
  	},
  
  
  	requestEvents: function(start, end, timezone, force) {
  		if (
  			force ||
  			!this.currentPeriod ||
  			!this.currentPeriod.isWithinRange(start, end) ||
  			timezone !== this.currentPeriod.timezone
  		) {
  			this.setPeriod( // will change this.currentPeriod
  				new EventPeriod(start, end, timezone)
  			);
  		}
  
  		return this.currentPeriod.whenReleased();
  	},
  
  
  	// Source Adding/Removing
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	addSource: function(eventSource) {
  		this.otherSources.push(eventSource);
  
  		if (this.currentPeriod) {
  			this.currentPeriod.requestSource(eventSource); // might release
  		}
  	},
  
  
  	removeSource: function(doomedSource) {
  		removeExact(this.otherSources, doomedSource);
  
  		if (this.currentPeriod) {
  			this.currentPeriod.purgeSource(doomedSource); // might release
  		}
  	},
  
  
  	removeAllSources: function() {
  		this.otherSources = [];
  
  		if (this.currentPeriod) {
  			this.currentPeriod.purgeAllSources(); // might release
  		}
  	},
  
  
  	// Source Refetching
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	refetchSource: function(eventSource) {
  		var currentPeriod = this.currentPeriod;
  
  		if (currentPeriod) {
  			currentPeriod.freeze();
  			currentPeriod.purgeSource(eventSource);
  			currentPeriod.requestSource(eventSource);
  			currentPeriod.thaw();
  		}
  	},
  
  
  	refetchAllSources: function() {
  		var currentPeriod = this.currentPeriod;
  
  		if (currentPeriod) {
  			currentPeriod.freeze();
  			currentPeriod.purgeAllSources();
  			currentPeriod.requestSources(this.getSources());
  			currentPeriod.thaw();
  		}
  	},
  
  
  	// Source Querying
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	getSources: function() {
  		return [ this.stickySource ].concat(this.otherSources);
  	},
  
  
  	// like querySources, but accepts multple match criteria (like multiple IDs)
  	multiQuerySources: function(matchInputs) {
  
  		// coerce into an array
  		if (!matchInputs) {
  			matchInputs = [];
  		}
  		else if (!$.isArray(matchInputs)) {
  			matchInputs = [ matchInputs ];
  		}
  
  		var matchingSources = [];
  		var i;
  
  		// resolve raw inputs to real event source objects
  		for (i = 0; i < matchInputs.length; i++) {
  			matchingSources.push.apply( // append
  				matchingSources,
  				this.querySources(matchInputs[i])
  			);
  		}
  
  		return matchingSources;
  	},
  
  
  	// matchInput can either by a real event source object, an ID, or the function/URL for the source.
  	// returns an array of matching source objects.
  	querySources: function(matchInput) {
  		var sources = this.otherSources;
  		var i, source;
  
  		// given a proper event source object
  		for (i = 0; i < sources.length; i++) {
  			source = sources[i];
  
  			if (source === matchInput) {
  				return [ source ];
  			}
  		}
  
  		// an ID match
  		source = this.getSourceById(EventSource.normalizeId(matchInput));
  		if (source) {
  			return [ source ];
  		}
  
  		// parse as an event source
  		matchInput = EventSourceParser.parse(matchInput, this.calendar);
  		if (matchInput) {
  
  			return $.grep(sources, function(source) {
  				return isSourcesEquivalent(matchInput, source);
  			});
  		}
  	},
  
  
  	/*
  	ID assumed to already be normalized
  	*/
  	getSourceById: function(id) {
  		return $.grep(this.otherSources, function(source) {
  			return source.id && source.id === id;
  		})[0];
  	},
  
  
  	// Event-Period
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	setPeriod: function(eventPeriod) {
  		if (this.currentPeriod) {
  			this.unbindPeriod(this.currentPeriod);
  			this.currentPeriod = null;
  		}
  
  		this.currentPeriod = eventPeriod;
  		this.bindPeriod(eventPeriod);
  
  		eventPeriod.requestSources(this.getSources());
  	},
  
  
  	bindPeriod: function(eventPeriod) {
  		this.listenTo(eventPeriod, 'release', function(eventsPayload) {
  			this.trigger('release', eventsPayload);
  		});
  	},
  
  
  	unbindPeriod: function(eventPeriod) {
  		this.stopListeningTo(eventPeriod);
  	},
  
  
  	// Event Getting/Adding/Removing
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	getEventDefByUid: function(uid) {
  		if (this.currentPeriod) {
  			return this.currentPeriod.getEventDefByUid(uid);
  		}
  	},
  
  
  	addEventDef: function(eventDef, isSticky) {
  		if (isSticky) {
  			this.stickySource.addEventDef(eventDef);
  		}
  
  		if (this.currentPeriod) {
  			this.currentPeriod.addEventDef(eventDef); // might release
  		}
  	},
  
  
  	removeEventDefsById: function(eventId) {
  		this.getSources().forEach(function(eventSource) {
  			eventSource.removeEventDefsById(eventId);
  		});
  
  		if (this.currentPeriod) {
  			this.currentPeriod.removeEventDefsById(eventId); // might release
  		}
  	},
  
  
  	removeAllEventDefs: function() {
  		this.getSources().forEach(function(eventSource) {
  			eventSource.removeAllEventDefs();
  		});
  
  		if (this.currentPeriod) {
  			this.currentPeriod.removeAllEventDefs();
  		}
  	},
  
  
  	// Event Mutating
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	/*
  	Returns an undo function.
  	*/
  	mutateEventsWithId: function(eventDefId, eventDefMutation) {
  		var currentPeriod = this.currentPeriod;
  		var eventDefs;
  		var undoFuncs = [];
  
  		if (currentPeriod) {
  
  			currentPeriod.freeze();
  
  			eventDefs = currentPeriod.getEventDefsById(eventDefId);
  			eventDefs.forEach(function(eventDef) {
  				// add/remove esp because id might change
  				currentPeriod.removeEventDef(eventDef);
  				undoFuncs.push(eventDefMutation.mutateSingle(eventDef));
  				currentPeriod.addEventDef(eventDef);
  			});
  
  			currentPeriod.thaw();
  
  			return function() {
  				currentPeriod.freeze();
  
  				for (var i = 0; i < eventDefs.length; i++) {
  					currentPeriod.removeEventDef(eventDefs[i]);
  					undoFuncs[i]();
  					currentPeriod.addEventDef(eventDefs[i]);
  				}
  
  				currentPeriod.thaw();
  			};
  		}
  
  		return function() { };
  	},
  
  
  	/*
  	copies and then mutates
  	*/
  	buildMutatedEventInstanceGroup: function(eventDefId, eventDefMutation) {
  		var eventDefs = this.getEventDefsById(eventDefId);
  		var i;
  		var defCopy;
  		var allInstances = [];
  
  		for (i = 0; i < eventDefs.length; i++) {
  			defCopy = eventDefs[i].clone();
  
  			if (defCopy instanceof SingleEventDef) {
  				eventDefMutation.mutateSingle(defCopy);
  
  				allInstances.push.apply(allInstances, // append
  					defCopy.buildInstances()
  				);
  			}
  		}
  
  		return new EventInstanceGroup(allInstances);
  	},
  
  
  	// Freezing
  	// -----------------------------------------------------------------------------------------------------------------
  
  
  	freeze: function() {
  		if (this.currentPeriod) {
  			this.currentPeriod.freeze();
  		}
  	},
  
  
  	thaw: function() {
  		if (this.currentPeriod) {
  			this.currentPeriod.thaw();
  		}
  	}
  
  });
  
  
  // Methods that straight-up query the current EventPeriod for an array of results.
  [
  	'getEventDefsById',
  	'getEventInstances',
  	'getEventInstancesWithId',
  	'getEventInstancesWithoutId'
  ].forEach(function(methodName) {
  
  	EventManager.prototype[methodName] = function() {
  		var currentPeriod = this.currentPeriod;
  
  		if (currentPeriod) {
  			return currentPeriod[methodName].apply(currentPeriod, arguments);
  		}
  
  		return [];
  	};
  });
  
  
  function isSourcesEquivalent(source0, source1) {
  	return source0.getPrimitive() == source1.getPrimitive();
  }
  
  ;;
  
  var BUSINESS_HOUR_EVENT_DEFAULTS = {
  	start: '09:00',
  	end: '17:00',
  	dow: [ 1, 2, 3, 4, 5 ], // monday - friday
  	rendering: 'inverse-background'
  	// classNames are defined in businessHoursSegClasses
  };
  
  
  var BusinessHourGenerator = FC.BusinessHourGenerator = Class.extend({
  
  	rawComplexDef: null,
  	calendar: null, // for anonymous EventSource
  
  
  	constructor: function(rawComplexDef, calendar) {
  		this.rawComplexDef = rawComplexDef;
  		this.calendar = calendar;
  	},
  
  
  	buildEventInstanceGroup: function(isAllDay, unzonedRange) {
  		var eventDefs = this.buildEventDefs(isAllDay);
  		var eventInstanceGroup;
  
  		if (eventDefs.length) {
  			eventInstanceGroup = new EventInstanceGroup(
  				eventDefsToEventInstances(eventDefs, unzonedRange)
  			);
  
  			// so that inverse-background rendering can happen even when no eventRanges in view
  			eventInstanceGroup.explicitEventDef = eventDefs[0];
  
  			return eventInstanceGroup;
  		}
  	},
  
  
  	buildEventDefs: function(isAllDay) {
  		var rawComplexDef = this.rawComplexDef;
  		var rawDefs = [];
  		var requireDow = false;
  		var i;
  		var defs = [];
  
  		if (rawComplexDef === true) {
  			rawDefs = [ {} ]; // will get BUSINESS_HOUR_EVENT_DEFAULTS verbatim
  		}
  		else if ($.isPlainObject(rawComplexDef)) {
  			rawDefs = [ rawComplexDef ];
  		}
  		else if ($.isArray(rawComplexDef)) {
  			rawDefs = rawComplexDef;
  			requireDow = true; // every sub-definition NEEDS a day-of-week
  		}
  
  		for (i = 0; i < rawDefs.length; i++) {
  			if (!requireDow || rawDefs[i].dow) {
  				defs.push(
  					this.buildEventDef(isAllDay, rawDefs[i])
  				);
  			}
  		}
  
  		return defs;
  	},
  
  
  	buildEventDef: function(isAllDay, rawDef) {
  		var fullRawDef = $.extend({}, BUSINESS_HOUR_EVENT_DEFAULTS, rawDef);
  
  		if (isAllDay) {
  			fullRawDef.start = null;
  			fullRawDef.end = null;
  		}
  
  		return RecurringEventDef.parse(
  			fullRawDef,
  			new EventSource(this.calendar) // dummy source
  		);
  	}
  
  });
  
  ;;
  
  var EventDefParser = {
  
  	parse: function(eventInput, source) {
  		if (
  			isTimeString(eventInput.start) || moment.isDuration(eventInput.start) ||
  			isTimeString(eventInput.end) || moment.isDuration(eventInput.end)
  		) {
  			return RecurringEventDef.parse(eventInput, source);
  		}
  		else {
  			return SingleEventDef.parse(eventInput, source);
  		}
  	}
  
  };
  
  ;;
  
  var EventDef = FC.EventDef = Class.extend(ParsableModelMixin, {
  
  	source: null, // required
  
  	id: null, // normalized supplied ID
  	rawId: null, // unnormalized supplied ID
  	uid: null, // internal ID. new ID for every definition
  
  	// NOTE: eventOrder sorting relies on these
  	title: null,
  	url: null,
  	rendering: null,
  	constraint: null,
  	overlap: null,
  	editable: null,
  	startEditable: null,
  	durationEditable: null,
  	color: null,
  	backgroundColor: null,
  	borderColor: null,
  	textColor: null,
  
  	className: null, // an array. TODO: rename to className*s* (API breakage)
  	miscProps: null,
  
  
  	constructor: function(source) {
  		this.source = source;
  		this.className = [];
  		this.miscProps = {};
  	},
  
  
  	isAllDay: function() {
  		// subclasses must implement
  	},
  
  
  	buildInstances: function(unzonedRange) {
  		// subclasses must implement
  	},
  
  
  	clone: function() {
  		var copy = new this.constructor(this.source);
  
  		copy.id = this.id;
  		copy.rawId = this.rawId;
  		copy.uid = this.uid; // not really unique anymore :(
  
  		EventDef.copyVerbatimStandardProps(this, copy);
  
  		copy.className = this.className.slice(); // copy
  		copy.miscProps = $.extend({}, this.miscProps);
  
  		return copy;
  	},
  
  
  	hasInverseRendering: function() {
  		return this.getRendering() === 'inverse-background';
  	},
  
  
  	hasBgRendering: function() {
  		var rendering = this.getRendering();
  
  		return rendering === 'inverse-background' || rendering === 'background';
  	},
  
  
  	getRendering: function() {
  		if (this.rendering != null) {
  			return this.rendering;
  		}
  
  		return this.source.rendering;
  	},
  
  
  	getConstraint: function() {
  		if (this.constraint != null) {
  			return this.constraint;
  		}
  
  		if (this.source.constraint != null) {
  			return this.source.constraint;
  		}
  
  		return this.source.calendar.opt('eventConstraint'); // what about View option?
  	},
  
  
  	getOverlap: function() {
  		if (this.overlap != null) {
  			return this.overlap;
  		}
  
  		if (this.source.overlap != null) {
  			return this.source.overlap;
  		}
  
  		return this.source.calendar.opt('eventOverlap'); // what about View option?
  	},
  
  
  	isStartExplicitlyEditable: function() {
  		if (this.startEditable !== null) {
  			return this.startEditable;
  		}
  
  		return this.source.startEditable;
  	},
  
  
  	isDurationExplicitlyEditable: function() {
  		if (this.durationEditable !== null) {
  			return this.durationEditable;
  		}
  
  		return this.source.durationEditable;
  	},
  
  
  	isExplicitlyEditable: function() {
  		if (this.editable !== null) {
  			return this.editable;
  		}
  
  		return this.source.editable;
  	},
  
  
  	toLegacy: function() {
  		var obj = $.extend({}, this.miscProps);
  
  		obj._id = this.uid;
  		obj.source = this.source;
  		obj.className = this.className.slice(); // copy
  		obj.allDay = this.isAllDay();
  
  		if (this.rawId != null) {
  			obj.id = this.rawId;
  		}
  
  		EventDef.copyVerbatimStandardProps(this, obj);
  
  		return obj;
  	},
  
  
  	applyManualStandardProps: function(rawProps) {
  
  		if (rawProps.id != null) {
  			this.id = EventDef.normalizeId((this.rawId = rawProps.id));
  		}
  		else {
  			this.id = EventDef.generateId();
  		}
  
  		if (rawProps._id != null) { // accept this prop, even tho somewhat internal
  			this.uid = String(rawProps._id);
  		}
  		else {
  			this.uid = EventDef.generateId();
  		}
  
  		// TODO: converge with EventSource
  		if ($.isArray(rawProps.className)) {
  			this.className = rawProps.className;
  		}
  		if (typeof rawProps.className === 'string') {
  			this.className = rawProps.className.split(/\s+/);
  		}
  
  		return true;
  	},
  
  
  	applyMiscProps: function(rawProps) {
  		$.extend(this.miscProps, rawProps);
  	}
  
  });
  
  // finish initializing the mixin
  EventDef.defineStandardProps = ParsableModelMixin_defineStandardProps;
  EventDef.copyVerbatimStandardProps = ParsableModelMixin_copyVerbatimStandardProps;
  
  
  // IDs
  // ---------------------------------------------------------------------------------------------------------------------
  // TODO: converge with EventSource
  
  
  EventDef.uuid = 0;
  
  
  EventDef.normalizeId = function(id) {
  	return String(id);
  };
  
  
  EventDef.generateId = function() {
  	return '_fc' + (EventDef.uuid++);
  };
  
  
  // Parsing
  // ---------------------------------------------------------------------------------------------------------------------
  
  
  EventDef.defineStandardProps({
  	// not automatically assigned (`false`)
  	_id: false,
  	id: false,
  	className: false,
  	source: false, // will ignored
  
  	// automatically assigned (`true`)
  	title: true,
  	url: true,
  	rendering: true,
  	constraint: true,
  	overlap: true,
  	editable: true,
  	startEditable: true,
  	durationEditable: true,
  	color: true,
  	backgroundColor: true,
  	borderColor: true,
  	textColor: true
  });
  
  
  EventDef.parse = function(rawInput, source) {
  	var def = new this(source);
  	var calendarTransform = source.calendar.opt('eventDataTransform');
  	var sourceTransform = source.eventDataTransform;
  
  	if (calendarTransform) {
  		rawInput = calendarTransform(rawInput);
  	}
  	if (sourceTransform) {
  		rawInput = sourceTransform(rawInput);
  	}
  
  	if (def.applyProps(rawInput)) {
  		return def;
  	}
  
  	return false;
  };
  
  ;;
  
  var SingleEventDef = EventDef.extend({
  
  	dateProfile: null,
  
  
  	/*
  	Will receive start/end params, but will be ignored.
  	*/
  	buildInstances: function() {
  		return [ this.buildInstance() ];
  	},
  
  
  	buildInstance: function() {
  		return new EventInstance(
  			this, // definition
  			this.dateProfile
  		);
  	},
  
  
  	isAllDay: function() {
  		return this.dateProfile.isAllDay();
  	},
  
  
  	clone: function() {
  		var def = EventDef.prototype.clone.call(this);
  
  		def.dateProfile = this.dateProfile;
  
  		return def;
  	},
  
  
  	rezone: function() {
  		var calendar = this.source.calendar;
  		var dateProfile = this.dateProfile;
  
  		this.dateProfile = new EventDateProfile(
  			calendar.moment(dateProfile.start),
  			dateProfile.end ? calendar.moment(dateProfile.end) : null,
  			calendar
  		);
  	},
  
  
  	/*
  	NOTE: if super-method fails, should still attempt to apply
  	*/
  	applyManualStandardProps: function(rawProps) {
  		var superSuccess = EventDef.prototype.applyManualStandardProps.apply(this, arguments);
  		var dateProfile = EventDateProfile.parse(rawProps, this.source); // returns null on failure
  
  		if (dateProfile) {
  			this.dateProfile = dateProfile;
  
  			// make sure `date` shows up in the legacy event objects as-is
  			if (rawProps.date != null) {
  				this.miscProps.date = rawProps.date;
  			}
  
  			return superSuccess;
  		}
  		else {
  			return false;
  		}
  	}
  
  });
  
  
  // Parsing
  // ---------------------------------------------------------------------------------------------------------------------
  
  
  SingleEventDef.defineStandardProps({ // false = manually process
  	start: false,
  	date: false, // alias for 'start'
  	end: false,
  	allDay: false
  });
  
  ;;
  
  var RecurringEventDef = EventDef.extend({
  
  	startTime: null, // duration
  	endTime: null, // duration, or null
  	dowHash: null, // object hash, or null
  
  
  	isAllDay: function() {
  		return !this.startTime && !this.endTime;
  	},
  
  
  	buildInstances: function(unzonedRange) {
  		var calendar = this.source.calendar;
  		var unzonedDate = unzonedRange.getStart();
  		var unzonedEnd = unzonedRange.getEnd();
  		var zonedDayStart;
  		var instanceStart, instanceEnd;
  		var instances = [];
  
  		while (unzonedDate.isBefore(unzonedEnd)) {
  
  			// if everyday, or this particular day-of-week
  			if (!this.dowHash || this.dowHash[unzonedDate.day()]) {
  
  				zonedDayStart = calendar.applyTimezone(unzonedDate);
  				instanceStart = zonedDayStart.clone();
  				instanceEnd = null;
  
  				if (this.startTime) {
  					instanceStart.time(this.startTime);
  				}
  				else {
  					instanceStart.stripTime();
  				}
  
  				if (this.endTime) {
  					instanceEnd = zonedDayStart.clone().time(this.endTime);
  				}
  
  				instances.push(
  					new EventInstance(
  						this, // definition
  						new EventDateProfile(instanceStart, instanceEnd, calendar)
  					)
  				);
  			}
  
  			unzonedDate.add(1, 'days');
  		}
  
  		return instances;
  	},
  
  
  	setDow: function(dowNumbers) {
  
  		if (!this.dowHash) {
  			this.dowHash = {};
  		}
  
  		for (var i = 0; i < dowNumbers.length; i++) {
  			this.dowHash[dowNumbers[i]] = true;
  		}
  	},
  
  
  	clone: function() {
  		var def = EventDef.prototype.clone.call(this);
  
  		if (def.startTime) {
  			def.startTime = moment.duration(this.startTime);
  		}
  
  		if (def.endTime) {
  			def.endTime = moment.duration(this.endTime);
  		}
  
  		if (this.dowHash) {
  			def.dowHash = $.extend({}, this.dowHash);
  		}
  
  		return def;
  	},
  
  
  	/*
  	NOTE: if super-method fails, should still attempt to apply
  	*/
  	applyProps: function(rawProps) {
  		var superSuccess = EventDef.prototype.applyProps.apply(this, arguments);
  
  		if (rawProps.start) {
  			this.startTime = moment.duration(rawProps.start);
  		}
  
  		if (rawProps.end) {
  			this.endTime = moment.duration(rawProps.end);
  		}
  
  		if (rawProps.dow) {
  			this.setDow(rawProps.dow);
  		}
  
  		return superSuccess;
  	}
  
  });
  
  
  // Parsing
  // ---------------------------------------------------------------------------------------------------------------------
  
  
  RecurringEventDef.defineStandardProps({ // false = manually process
  	start: false,
  	end: false,
  	dow: false
  });
  
  ;;
  
  var EventInstance = Class.extend({
  
  	def: null, // EventDef
  	dateProfile: null, // EventDateProfile
  
  
  	constructor: function(def, dateProfile) {
  		this.def = def;
  		this.dateProfile = dateProfile;
  	},
  
  
  	toLegacy: function() {
  		var dateProfile = this.dateProfile;
  		var obj = this.def.toLegacy();
  
  		obj.start = dateProfile.start.clone();
  		obj.end = dateProfile.end ? dateProfile.end.clone() : null;
  
  		return obj;
  	}
  
  });
  
  ;;
  
  /*
  It's expected that there will be at least one EventInstance,
  OR that an explicitEventDef is assigned.
  */
  var EventInstanceGroup = FC.EventInstanceGroup = Class.extend({
  
  	eventInstances: null,
  	explicitEventDef: null, // optional
  
  
  	constructor: function(eventInstances) {
  		this.eventInstances = eventInstances || [];
  	},
  
  
  	getAllEventRanges: function(constraintRange) {
  		if (constraintRange) {
  			return this.sliceNormalRenderRanges(constraintRange);
  		}
  		else {
  			return this.eventInstances.map(eventInstanceToEventRange);
  		}
  	},
  
  
  	sliceRenderRanges: function(constraintRange) {
  		if (this.isInverse()) {
  			return this.sliceInverseRenderRanges(constraintRange);
  		}
  		else {
  			return this.sliceNormalRenderRanges(constraintRange);
  		}
  	},
  
  
  	sliceNormalRenderRanges: function(constraintRange) {
  		var eventInstances = this.eventInstances;
  		var i, eventInstance;
  		var slicedRange;
  		var slicedEventRanges = [];
  
  		for (i = 0; i < eventInstances.length; i++) {
  			eventInstance = eventInstances[i];
  
  			slicedRange = eventInstance.dateProfile.unzonedRange.intersect(constraintRange);
  
  			if (slicedRange) {
  				slicedEventRanges.push(
  					new EventRange(
  						slicedRange,
  						eventInstance.def,
  						eventInstance
  					)
  				);
  			}
  		}
  
  		return slicedEventRanges;
  	},
  
  
  	sliceInverseRenderRanges: function(constraintRange) {
  		var unzonedRanges = this.eventInstances.map(eventInstanceToUnzonedRange);
  		var ownerDef = this.getEventDef();
  
  		unzonedRanges = invertUnzonedRanges(unzonedRanges, constraintRange);
  
  		return unzonedRanges.map(function(unzonedRange) {
  			return new EventRange(unzonedRange, ownerDef); // don't give an EventInstance
  		});
  	},
  
  
  	isInverse: function() {
  		return this.getEventDef().hasInverseRendering();
  	},
  
  
  	getEventDef: function() {
  		return this.explicitEventDef || this.eventInstances[0].def;
  	}
  
  });
  
  ;;
  
  /*
  Meant to be immutable
  */
  var EventDateProfile = Class.extend({
  
  	start: null,
  	end: null,
  	unzonedRange: null,
  
  
  	constructor: function(start, end, calendar) {
  		this.start = start;
  		this.end = end || null;
  		this.unzonedRange = this.buildUnzonedRange(calendar);
  	},
  
  
  	isAllDay: function() { // why recompute this every time?
  		return !(this.start.hasTime() || (this.end && this.end.hasTime()));
  	},
  
  
  	/*
  	Needs a Calendar object
  	*/
  	buildUnzonedRange: function(calendar) {
  		var startMs = this.start.clone().stripZone().valueOf();
  		var endMs = this.getEnd(calendar).stripZone().valueOf();
  
  		return new UnzonedRange(startMs, endMs);
  	},
  
  
  	/*
  	Needs a Calendar object
  	*/
  	getEnd: function(calendar) {
  		return this.end ?
  			this.end.clone() :
  			// derive the end from the start and allDay. compute allDay if necessary
  			calendar.getDefaultEventEnd(
  				this.isAllDay(),
  				this.start
  			);
  	}
  
  });
  
  
  EventDateProfile.isStandardProp = function(propName) {
  	return propName === 'start' || propName === 'date' || propName === 'end' || propName === 'allDay';
  };
  
  
  /*
  Needs an EventSource object
  */
  EventDateProfile.parse = function(rawProps, source) {
  	var startInput = rawProps.start || rawProps.date;
  	var endInput = rawProps.end;
  
  	if (!startInput) {
  		return false;
  	}
  
  	var calendar = source.calendar;
  	var start = calendar.moment(startInput);
  	var end = endInput ? calendar.moment(endInput) : null;
  	var forcedAllDay = rawProps.allDay;
  	var forceEventDuration = calendar.opt('forceEventDuration');
  
  	if (!start.isValid()) {
  		return false;
  	}
  
  	if (end && (!end.isValid() || !end.isAfter(start))) {
  		end = null;
  	}
  
  	if (forcedAllDay == null) {
  		forcedAllDay = source.allDayDefault;
  		if (forcedAllDay == null) {
  			forcedAllDay = calendar.opt('allDayDefault');
  		}
  	}
  
  	if (forcedAllDay === true) {
  		start.stripTime();
  		if (end) {
  			end.stripTime();
  		}
  	}
  	else if (forcedAllDay === false) {
  		if (!start.hasTime()) {
  			start.time(0);
  		}
  		if (end && !end.hasTime()) {
  			end.time(0);
  		}
  	}
  
  	if (!end && forceEventDuration) {
  		end = calendar.getDefaultEventEnd(!start.hasTime(), start);
  	}
  
  	return new EventDateProfile(start, end, calendar);
  };
  
  ;;
  
  var EventRange = Class.extend({
  
  	unzonedRange: null,
  	eventDef: null,
  	eventInstance: null, // optional
  
  
  	constructor: function(unzonedRange, eventDef, eventInstance) {
  		this.unzonedRange = unzonedRange;
  		this.eventDef = eventDef;
  
  		if (eventInstance) {
  			this.eventInstance = eventInstance;
  		}
  	}
  
  });
  
  ;;
  
  var EventFootprint = FC.EventFootprint = Class.extend({
  
  	componentFootprint: null,
  	eventDef: null,
  	eventInstance: null, // optional
  
  
  	constructor: function(componentFootprint, eventDef, eventInstance) {
  		this.componentFootprint = componentFootprint;
  		this.eventDef = eventDef;
  
  		if (eventInstance) {
  			this.eventInstance = eventInstance;
  		}
  	},
  
  
  	getEventLegacy: function() {
  		return (this.eventInstance || this.eventDef).toLegacy();
  	}
  
  });
  
  ;;
  
  var EventDefMutation = FC.EventDefMutation = Class.extend({
  
  	// won't ever be empty. will be null instead.
  	// callers should use setDateMutation for setting.
  	dateMutation: null,
  
  	// hacks to get updateEvent/createFromRawProps to work.
  	// not undo-able and not considered in isEmpty.
  	eventDefId: null, // standard manual props
  	className: null, // "
  	verbatimStandardProps: null,
  	miscProps: null,
  
  
  	/*
  	eventDef assumed to be a SingleEventDef.
  	returns an undo function.
  	*/
  	mutateSingle: function(eventDef) {
  		var origDateProfile;
  
  		if (this.dateMutation) {
  			origDateProfile = eventDef.dateProfile;
  
  			eventDef.dateProfile = this.dateMutation.buildNewDateProfile(
  				origDateProfile,
  				eventDef.source.calendar
  			);
  		}
  
  		// can't undo
  		// TODO: more DRY with EventDef::applyManualStandardProps
  		if (this.eventDefId != null) {
  			eventDef.id = EventDef.normalizeId((eventDef.rawId = this.eventDefId));
  		}
  
  		// can't undo
  		// TODO: more DRY with EventDef::applyManualStandardProps
  		if (this.className) {
  			eventDef.className = this.className;
  		}
  
  		// can't undo
  		if (this.verbatimStandardProps) {
  			SingleEventDef.copyVerbatimStandardProps(
  				this.verbatimStandardProps, // src
  				eventDef // dest
  			);
  		}
  
  		// can't undo
  		if (this.miscProps) {
  			eventDef.applyMiscProps(this.miscProps);
  		}
  
  		if (origDateProfile) {
  			return function() {
  				eventDef.dateProfile = origDateProfile;
  			};
  		}
  		else {
  			return function() { };
  		}
  	},
  
  
  	setDateMutation: function(dateMutation) {
  		if (dateMutation && !dateMutation.isEmpty()) {
  			this.dateMutation = dateMutation;
  		}
  		else {
  			this.dateMutation = null;
  		}
  	},
  
  
  	isEmpty: function() {
  		return !this.dateMutation;
  	}
  
  });
  
  
  EventDefMutation.createFromRawProps = function(eventInstance, rawProps, largeUnit) {
  	var eventDef = eventInstance.def;
  	var dateProps = {};
  	var standardProps = {};
  	var miscProps = {};
  	var verbatimStandardProps = {};
  	var eventDefId = null;
  	var className = null;
  	var propName;
  	var dateProfile;
  	var dateMutation;
  	var defMutation;
  
  	for (propName in rawProps) {
  		if (EventDateProfile.isStandardProp(propName)) {
  			dateProps[propName] = rawProps[propName];
  		}
  		else if (eventDef.isStandardProp(propName)) {
  			standardProps[propName] = rawProps[propName];
  		}
  		else if (eventDef.miscProps[propName] !== rawProps[propName]) { // only if changed
  			miscProps[propName] = rawProps[propName];
  		}
  	}
  
  	dateProfile = EventDateProfile.parse(dateProps, eventDef.source);
  
  	if (dateProfile) { // no failure?
  		dateMutation = EventDefDateMutation.createFromDiff(
  			eventInstance.dateProfile,
  			dateProfile,
  			largeUnit
  		);
  	}
  
  	if (standardProps.id !== eventDef.id) {
  		eventDefId = standardProps.id; // only apply if there's a change
  	}
  
  	if (!isArraysEqual(standardProps.className, eventDef.className)) {
  		className = standardProps.className; // only apply if there's a change
  	}
  
  	EventDef.copyVerbatimStandardProps(
  		standardProps, // src
  		verbatimStandardProps // dest
  	);
  
  	defMutation = new EventDefMutation();
  	defMutation.eventDefId = eventDefId;
  	defMutation.className = className;
  	defMutation.verbatimStandardProps = verbatimStandardProps;
  	defMutation.miscProps = miscProps;
  
  	if (dateMutation) {
  		defMutation.dateMutation = dateMutation;
  	}
  
  	return defMutation;
  };
  
  ;;
  
  var EventDefDateMutation = Class.extend({
  
  	clearEnd: false,
  	forceTimed: false,
  	forceAllDay: false,
  
  	// Durations. if 0-ms duration, will be null instead.
  	// Callers should not set this directly.
  	dateDelta: null,
  	startDelta: null,
  	endDelta: null,
  
  
  	/*
  	returns an undo function.
  	*/
  	buildNewDateProfile: function(eventDateProfile, calendar) {
  		var start = eventDateProfile.start.clone();
  		var end = null;
  		var shouldRezone = false;
  
  		if (eventDateProfile.end && !this.clearEnd) {
  			end = eventDateProfile.end.clone();
  		}
  		// if there will be an end-date mutation, guarantee an end,
  		// ambigously-zoned according to the original allDay
  		else if (this.endDelta && !end) {
  			end = calendar.getDefaultEventEnd(eventDateProfile.isAllDay(), start);
  		}
  
  		if (this.forceTimed) {
  			shouldRezone = true;
  
  			if (!start.hasTime()) {
  				start.time(0);
  			}
  
  			if (end && !end.hasTime()) {
  				end.time(0);
  			}
  		}
  		else if (this.forceAllDay) {
  
  			if (start.hasTime()) {
  				start.stripTime();
  			}
  
  			if (end && end.hasTime()) {
  				end.stripTime();
  			}
  		}
  
  		if (this.dateDelta) {
  			shouldRezone = true;
  
  			start.add(this.dateDelta);
  
  			if (end) {
  				end.add(this.dateDelta);
  			}
  		}
  
  		// do this before adding startDelta to start, so we can work off of start
  		if (this.endDelta) {
  			shouldRezone = true;
  
  			end.add(this.endDelta);
  		}
  
  		if (this.startDelta) {
  			shouldRezone = true;
  
  			start.add(this.startDelta);
  		}
  
  		if (shouldRezone) {
  			start = calendar.applyTimezone(start);
  
  			if (end) {
  				end = calendar.applyTimezone(end);
  			}
  		}
  
  		// TODO: okay to access calendar option?
  		if (!end && calendar.opt('forceEventDuration')) {
  			end = calendar.getDefaultEventEnd(eventDateProfile.isAllDay(), start);
  		}
  
  		return new EventDateProfile(start, end, calendar);
  	},
  
  
  	setDateDelta: function(dateDelta) {
  		if (dateDelta && dateDelta.valueOf()) {
  			this.dateDelta = dateDelta;
  		}
  		else {
  			this.dateDelta = null;
  		}
  	},
  
  
  	setStartDelta: function(startDelta) {
  		if (startDelta && startDelta.valueOf()) {
  			this.startDelta = startDelta;
  		}
  		else {
  			this.startDelta = null;
  		}
  	},
  
  
  	setEndDelta: function(endDelta) {
  		if (endDelta && endDelta.valueOf()) {
  			this.endDelta = endDelta;
  		}
  		else {
  			this.endDelta = null;
  		}
  	},
  
  
  	isEmpty: function() {
  		return !this.clearEnd && !this.forceTimed && !this.forceAllDay &&
  			!this.dateDelta && !this.startDelta && !this.endDelta;
  	}
  
  });
  
  
  EventDefDateMutation.createFromDiff = function(dateProfile0, dateProfile1, largeUnit) {
  	var clearEnd = dateProfile0.end && !dateProfile1.end;
  	var forceTimed = dateProfile0.isAllDay() && !dateProfile1.isAllDay();
  	var forceAllDay = !dateProfile0.isAllDay() && dateProfile1.isAllDay();
  	var dateDelta;
  	var endDiff;
  	var endDelta;
  	var mutation;
  
  	// subtracts the dates in the appropriate way, returning a duration
  	function subtractDates(date1, date0) { // date1 - date0
  		if (largeUnit) {
  			return diffByUnit(date1, date0, largeUnit); // poorly named
  		}
  		else if (dateProfile1.isAllDay()) {
  			return diffDay(date1, date0); // poorly named
  		}
  		else {
  			return diffDayTime(date1, date0); // poorly named
  		}
  	}
  
  	dateDelta = subtractDates(dateProfile1.start, dateProfile0.start);
  
  	if (dateProfile1.end) {
  		// use unzonedRanges because dateProfile0.end might be null
  		endDiff = subtractDates(
  			dateProfile1.unzonedRange.getEnd(),
  			dateProfile0.unzonedRange.getEnd()
  		);
  		endDelta = endDiff.subtract(dateDelta);
  	}
  
  	mutation = new EventDefDateMutation();
  	mutation.clearEnd = clearEnd;
  	mutation.forceTimed = forceTimed;
  	mutation.forceAllDay = forceAllDay;
  	mutation.setDateDelta(dateDelta);
  	mutation.setEndDelta(endDelta);
  
  	return mutation;
  };
  
  ;;
  
  function eventDefsToEventInstances(eventDefs, unzonedRange) {
  	var eventInstances = [];
  	var i;
  
  	for (i = 0; i < eventDefs.length; i++) {
  		eventInstances.push.apply(eventInstances, // append
  			eventDefs[i].buildInstances(unzonedRange)
  		);
  	}
  
  	return eventInstances;
  }
  
  
  function eventInstanceToEventRange(eventInstance) {
  	return new EventRange(
  		eventInstance.dateProfile.unzonedRange,
  		eventInstance.def,
  		eventInstance
  	);
  }
  
  
  function eventRangeToEventFootprint(eventRange) {
  	return new EventFootprint(
  		new ComponentFootprint(
  			eventRange.unzonedRange,
  			eventRange.eventDef.isAllDay()
  		),
  		eventRange.eventDef,
  		eventRange.eventInstance // might not exist
  	);
  }
  
  
  function eventInstanceToUnzonedRange(eventInstance) {
  	return eventInstance.dateProfile.unzonedRange;
  }
  
  
  function eventFootprintToComponentFootprint(eventFootprint) {
  	return eventFootprint.componentFootprint;
  }
  
  ;;
  
  var EventSource = Class.extend(ParsableModelMixin, {
  
  	calendar: null,
  
  	id: null, // can stay null
  	uid: null,
  	color: null,
  	backgroundColor: null,
  	borderColor: null,
  	textColor: null,
  	className: null, // array
  	editable: null,
  	startEditable: null,
  	durationEditable: null,
  	rendering: null,
  	overlap: null,
  	constraint: null,
  	allDayDefault: null,
  	eventDataTransform: null, // optional function
  
  
  	// can we do away with calendar? at least for the abstract?
  	// useful for buildEventDef
  	constructor: function(calendar) {
  		this.calendar = calendar;
  		this.className = [];
  		this.uid = String(EventSource.uuid++);
  	},
  
  
  	fetch: function(start, end, timezone) {
  		// subclasses must implement. must return a promise.
  	},
  
  
  	removeEventDefsById: function(eventDefId) {
  		// optional for subclasses to implement
  	},
  
  
  	removeAllEventDefs: function() {
  		// optional for subclasses to implement
  	},
  
  
  	/*
  	For compairing/matching
  	*/
  	getPrimitive: function(otherSource) {
  		// subclasses must implement
  	},
  
  
  	parseEventDefs: function(rawEventDefs) {
  		var i;
  		var eventDef;
  		var eventDefs = [];
  
  		for (i = 0; i < rawEventDefs.length; i++) {
  			eventDef = EventDefParser.parse(
  				rawEventDefs[i],
  				this // source
  			);
  
  			if (eventDef) {
  				eventDefs.push(eventDef);
  			}
  		}
  
  		return eventDefs;
  	},
  
  
  	applyManualStandardProps: function(rawProps) {
  
  		if (rawProps.id != null) {
  			this.id = EventSource.normalizeId(rawProps.id);
  		}
  
  		// TODO: converge with EventDef
  		if ($.isArray(rawProps.className)) {
  			this.className = rawProps.className;
  		}
  		else if (typeof rawProps.className === 'string') {
  			this.className = rawProps.className.split(/\s+/);
  		}
  
  		return true;
  	}
  
  });
  
  
  // finish initializing the mixin
  EventSource.defineStandardProps = ParsableModelMixin_defineStandardProps;
  
  
  // IDs
  // ---------------------------------------------------------------------------------------------------------------------
  // TODO: converge with EventDef
  
  
  EventSource.uuid = 0;
  
  
  EventSource.normalizeId = function(id) {
  	if (id) {
  		return String(id);
  	}
  
  	return null;
  };
  
  
  // Parsing
  // ---------------------------------------------------------------------------------------------------------------------
  
  
  EventSource.defineStandardProps({
  	// manually process...
  	id: false,
  	className: false,
  
  	// automatically transfer...
  	color: true,
  	backgroundColor: true,
  	borderColor: true,
  	textColor: true,
  	editable: true,
  	startEditable: true,
  	durationEditable: true,
  	rendering: true,
  	overlap: true,
  	constraint: true,
  	allDayDefault: true,
  	eventDataTransform: true
  });
  
  
  /*
  rawInput can be any data type!
  */
  EventSource.parse = function(rawInput, calendar) {
  	var source = new this(calendar);
  
  	if (typeof rawInput === 'object') {
  		if (source.applyProps(rawInput)) {
  			return source;
  		}
  	}
  
  	return false;
  };
  
  
  FC.EventSource = EventSource;
  
  ;;
  
  var EventSourceParser = {
  
  	sourceClasses: [],
  
  
  	registerClass: function(EventSourceClass) {
  		this.sourceClasses.unshift(EventSourceClass); // give highest priority
  	},
  
  
  	parse: function(rawInput, calendar) {
  		var sourceClasses = this.sourceClasses;
  		var i;
  		var eventSource;
  
  		for (i = 0; i < sourceClasses.length; i++) {
  			eventSource = sourceClasses[i].parse(rawInput, calendar);
  
  			if (eventSource) {
  				return eventSource;
  			}
  		}
  	}
  
  };
  
  
  FC.EventSourceParser = EventSourceParser;
  
  ;;
  
  var ArrayEventSource = EventSource.extend({
  
  	rawEventDefs: null, // unparsed
  	eventDefs: null,
  	currentTimezone: null,
  
  
  	constructor: function(calendar) {
  		EventSource.apply(this, arguments); // super-constructor
  		this.eventDefs = []; // for if setRawEventDefs is never called
  	},
  
  
  	setRawEventDefs: function(rawEventDefs) {
  		this.rawEventDefs = rawEventDefs;
  		this.eventDefs = this.parseEventDefs(rawEventDefs);
  	},
  
  
  	fetch: function(start, end, timezone) {
  		var eventDefs = this.eventDefs;
  		var i;
  
  		if (
  			this.currentTimezone !== null &&
  			this.currentTimezone !== timezone
  		) {
  			for (i = 0; i < eventDefs.length; i++) {
  				if (eventDefs[i] instanceof SingleEventDef) {
  					eventDefs[i].rezone();
  				}
  			}
  		}
  
  		this.currentTimezone = timezone;
  
  		return Promise.resolve(eventDefs);
  	},
  
  
  	addEventDef: function(eventDef) {
  		this.eventDefs.push(eventDef);
  	},
  
  
  	/*
  	eventDefId already normalized to a string
  	*/
  	removeEventDefsById: function(eventDefId) {
  		return removeMatching(this.eventDefs, function(eventDef) {
  			return eventDef.id === eventDefId;
  		});
  	},
  
  
  	removeAllEventDefs: function() {
  		this.eventDefs = [];
  	},
  
  
  	getPrimitive: function() {
  		return this.rawEventDefs;
  	},
  
  
  	applyManualStandardProps: function(rawProps) {
  		var superSuccess = EventSource.prototype.applyManualStandardProps.apply(this, arguments);
  
  		this.setRawEventDefs(rawProps.events);
  
  		return superSuccess;
  	}
  
  });
  
  
  ArrayEventSource.defineStandardProps({
  	events: false // don't automatically transfer
  });
  
  
  ArrayEventSource.parse = function(rawInput, calendar) {
  	var rawProps;
  
  	// normalize raw input
  	if ($.isArray(rawInput.events)) { // extended form
  		rawProps = rawInput;
  	}
  	else if ($.isArray(rawInput)) { // short form
  		rawProps = { events: rawInput };
  	}
  
  	if (rawProps) {
  		return EventSource.parse.call(this, rawProps, calendar);
  	}
  
  	return false;
  };
  
  
  EventSourceParser.registerClass(ArrayEventSource);
  
  FC.ArrayEventSource = ArrayEventSource;
  
  ;;
  
  var FuncEventSource = EventSource.extend({
  
  	func: null,
  
  
  	fetch: function(start, end, timezone) {
  		var _this = this;
  
  		this.calendar.pushLoading();
  
  		return Promise.construct(function(onResolve) {
  			_this.func.call(
  				_this.calendar,
  				start.clone(),
  				end.clone(),
  				timezone,
  				function(rawEventDefs) {
  					_this.calendar.popLoading();
  
  					onResolve(_this.parseEventDefs(rawEventDefs));
  				}
  			);
  		});
  	},
  
  
  	getPrimitive: function() {
  		return this.func;
  	},
  
  
  	applyManualStandardProps: function(rawProps) {
  		var superSuccess = EventSource.prototype.applyManualStandardProps.apply(this, arguments);
  
  		this.func = rawProps.events;
  
  		return superSuccess;
  	}
  
  });
  
  
  FuncEventSource.defineStandardProps({
  	events: false // don't automatically transfer
  });
  
  
  FuncEventSource.parse = function(rawInput, calendar) {
  	var rawProps;
  
  	// normalize raw input
  	if ($.isFunction(rawInput.events)) { // extended form
  		rawProps = rawInput;
  	}
  	else if ($.isFunction(rawInput)) { // short form
  		rawProps = { events: rawInput };
  	}
  
  	if (rawProps) {
  		return EventSource.parse.call(this, rawProps, calendar);
  	}
  
  	return false;
  };
  
  
  EventSourceParser.registerClass(FuncEventSource);
  
  FC.FuncEventSource = FuncEventSource;
  
  ;;
  
  var JsonFeedEventSource = EventSource.extend({
  
  	// these props must all be manually set before calling fetch
  	url: null,
  	startParam: null,
  	endParam: null,
  	timezoneParam: null,
  	ajaxSettings: null, // does not include url
  
  
  	fetch: function(start, end, timezone) {
  		var _this = this;
  		var ajaxSettings = this.ajaxSettings;
  		var onSuccess = ajaxSettings.success;
  		var onError = ajaxSettings.error;
  		var requestParams = this.buildRequestParams(start, end, timezone);
  
  		// todo: eventually handle the promise's then,
  		// don't intercept success/error
  		// tho will be a breaking API change
  
  		this.calendar.pushLoading();
  
  		return Promise.construct(function(onResolve, onReject) {
  			$.ajax($.extend(
  				{}, // destination
  				JsonFeedEventSource.AJAX_DEFAULTS,
  				ajaxSettings,
  				{
  					url: _this.url,
  					data: requestParams,
  					success: function(rawEventDefs) {
  						var callbackRes;
  
  						_this.calendar.popLoading();
  
  						if (rawEventDefs) {
  							callbackRes = applyAll(onSuccess, this, arguments); // redirect `this`
  
  							if ($.isArray(callbackRes)) {
  								rawEventDefs = callbackRes;
  							}
  
  							onResolve(_this.parseEventDefs(rawEventDefs));
  						}
  						else {
  							onReject();
  						}
  					},
  					error: function() {
  						_this.calendar.popLoading();
  
  						applyAll(onError, this, arguments); // redirect `this`
  						onReject();
  					}
  				}
  			));
  		});
  	},
  
  
  	buildRequestParams: function(start, end, timezone) {
  		var calendar = this.calendar;
  		var ajaxSettings = this.ajaxSettings;
  		var startParam, endParam, timezoneParam;
  		var customRequestParams;
  		var params = {};
  
  		startParam = this.startParam;
  		if (startParam == null) {
  			startParam = calendar.opt('startParam');
  		}
  
  		endParam = this.endParam;
  		if (endParam == null) {
  			endParam = calendar.opt('endParam');
  		}
  
  		timezoneParam = this.timezoneParam;
  		if (timezoneParam == null) {
  			timezoneParam = calendar.opt('timezoneParam');
  		}
  
  		// retrieve any outbound GET/POST $.ajax data from the options
  		if ($.isFunction(ajaxSettings.data)) {
  			// supplied as a function that returns a key/value object
  			customRequestParams = ajaxSettings.data();
  		}
  		else {
  			// probably supplied as a straight key/value object
  			customRequestParams = ajaxSettings.data || {};
  		}
  
  		$.extend(params, customRequestParams);
  
  		params[startParam] = start.format();
  		params[endParam] = end.format();
  
  		if (timezone && timezone !== 'local') {
  			params[timezoneParam] = timezone;
  		}
  
  		return params;
  	},
  
  
  	getPrimitive: function() {
  		return this.url;
  	},
  
  
  	applyMiscProps: function(rawProps) {
  		EventSource.prototype.applyMiscProps.apply(this, arguments);
  
  		this.ajaxSettings = rawProps;
  	}
  
  });
  
  
  JsonFeedEventSource.AJAX_DEFAULTS = {
  	dataType: 'json',
  	cache: false
  };
  
  
  JsonFeedEventSource.defineStandardProps({
  	// automatically transfer (true)...
  	url: true,
  	startParam: true,
  	endParam: true,
  	timezoneParam: true
  });
  
  
  JsonFeedEventSource.parse = function(rawInput, calendar) {
  	var rawProps;
  
  	// normalize raw input
  	if (typeof rawInput.url === 'string') { // extended form
  		rawProps = rawInput;
  	}
  	else if (typeof rawInput === 'string') { // short form
  		rawProps = { url: rawInput };
  	}
  
  	if (rawProps) {
  		return EventSource.parse.call(this, rawProps, calendar);
  	}
  
  	return false;
  };
  
  
  EventSourceParser.registerClass(JsonFeedEventSource);
  
  FC.JsonFeedEventSource = JsonFeedEventSource;
  
  ;;
  
  var ThemeRegistry = FC.ThemeRegistry = {
  
  	themeClassHash: {},
  
  
  	register: function(themeName, themeClass) {
  		this.themeClassHash[themeName] = themeClass;
  	},
  
  
  	getThemeClass: function(themeSetting) {
  		if (!themeSetting) {
  			return StandardTheme;
  		}
  		else if (themeSetting === true) {
  			return JqueryUiTheme;
  		}
  		else {
  			return this.themeClassHash[themeSetting];
  		}
  	}
  
  };
  
  ;;
  
  var Theme = FC.Theme = Class.extend({
  
  	classes: {},
  	iconClasses: {},
  	baseIconClass: '',
  	iconOverrideOption: null,
  	iconOverrideCustomButtonOption: null,
  	iconOverridePrefix: '',
  
  
  	constructor: function(optionsModel) {
  		this.optionsModel = optionsModel;
  		this.processIconOverride();
  	},
  
  
  	processIconOverride: function() {
  		if (this.iconOverrideOption) {
  			this.setIconOverride(
  				this.optionsModel.get(this.iconOverrideOption)
  			);
  		}
  	},
  
  
  	setIconOverride: function(iconOverrideHash) {
  		var iconClassesCopy;
  		var buttonName;
  
  		if ($.isPlainObject(iconOverrideHash)) {
  			iconClassesCopy = $.extend({}, this.iconClasses);
  
  			for (buttonName in iconOverrideHash) {
  				iconClassesCopy[buttonName] = this.applyIconOverridePrefix(
  					iconOverrideHash[buttonName]
  				);
  			}
  
  			this.iconClasses = iconClassesCopy;
  		}
  		else if (iconOverrideHash === false) {
  			this.iconClasses = {};
  		}
  	},
  
  
  	applyIconOverridePrefix: function(className) {
  		var prefix = this.iconOverridePrefix;
  
  		if (prefix && className.indexOf(prefix) !== 0) { // if not already present
  			className = prefix + className;
  		}
  
  		return className;
  	},
  
  
  	getClass: function(key) {
  		return this.classes[key] || '';
  	},
  
  
  	getIconClass: function(buttonName) {
  		var className = this.iconClasses[buttonName];
  
  		if (className) {
  			return this.baseIconClass + ' ' + className;
  		}
  
  		return '';
  	},
  
  
  	getCustomButtonIconClass: function(customButtonProps) {
  		var className;
  
  		if (this.iconOverrideCustomButtonOption) {
  			className = customButtonProps[this.iconOverrideCustomButtonOption];
  
  			if (className) {
  				return this.baseIconClass + ' ' + this.applyIconOverridePrefix(className);
  			}
  		}
  
  		return '';
  	}
  
  });
  
  ;;
  
  var StandardTheme = Theme.extend({
  
  	classes: {
  		widget: 'fc-unthemed',
  		widgetHeader: 'fc-widget-header',
  		widgetContent: 'fc-widget-content',
  
  		buttonGroup: 'fc-button-group',
  		button: 'fc-button',
  		cornerLeft: 'fc-corner-left',
  		cornerRight: 'fc-corner-right',
  		stateDefault: 'fc-state-default',
  		stateActive: 'fc-state-active',
  		stateDisabled: 'fc-state-disabled',
  		stateHover: 'fc-state-hover',
  		stateDown: 'fc-state-down',
  
  		popoverHeader: 'fc-widget-header',
  		popoverContent: 'fc-widget-content',
  
  		// day grid
  		headerRow: 'fc-widget-header',
  		dayRow: 'fc-widget-content',
  
  		// list view
  		listView: 'fc-widget-content'
  	},
  
  	baseIconClass: 'fc-icon',
  	iconClasses: {
  		close: 'fc-icon-x',
  		prev: 'fc-icon-left-single-arrow',
  		next: 'fc-icon-right-single-arrow',
  		prevYear: 'fc-icon-left-double-arrow',
  		nextYear: 'fc-icon-right-double-arrow'
  	},
  
  	iconOverrideOption: 'buttonIcons',
  	iconOverrideCustomButtonOption: 'icon',
  	iconOverridePrefix: 'fc-icon-'
  
  });
  
  ThemeRegistry.register('standard', StandardTheme);
  
  ;;
  
  var JqueryUiTheme = Theme.extend({
  
  	classes: {
  		widget: 'ui-widget',
  		widgetHeader: 'ui-widget-header',
  		widgetContent: 'ui-widget-content',
  
  		buttonGroup: 'fc-button-group',
  		button: 'ui-button',
  		cornerLeft: 'ui-corner-left',
  		cornerRight: 'ui-corner-right',
  		stateDefault: 'ui-state-default',
  		stateActive: 'ui-state-active',
  		stateDisabled: 'ui-state-disabled',
  		stateHover: 'ui-state-hover',
  		stateDown: 'ui-state-down',
  
  		today: 'ui-state-highlight',
  
  		popoverHeader: 'ui-widget-header',
  		popoverContent: 'ui-widget-content',
  
  		// day grid
  		headerRow: 'ui-widget-header',
  		dayRow: 'ui-widget-content',
  
  		// list view
  		listView: 'ui-widget-content'
  	},
  
  	baseIconClass: 'ui-icon',
  	iconClasses: {
  		close: 'ui-icon-closethick',
  		prev: 'ui-icon-circle-triangle-w',
  		next: 'ui-icon-circle-triangle-e',
  		prevYear: 'ui-icon-seek-prev',
  		nextYear: 'ui-icon-seek-next'
  	},
  
  	iconOverrideOption: 'themeButtonIcons',
  	iconOverrideCustomButtonOption: 'themeIcon',
  	iconOverridePrefix: 'ui-icon-'
  
  });
  
  ThemeRegistry.register('jquery-ui', JqueryUiTheme);
  
  ;;
  
  var BootstrapTheme = Theme.extend({
  
  	classes: {
  		widget: 'fc-bootstrap3',
  
  		tableGrid: 'table-bordered', // avoid `table` class b/c don't want margins. only border color
  		tableList: 'table table-striped', // `table` class creates bottom margin but who cares
  
  		buttonGroup: 'btn-group',
  		button: 'btn btn-default',
  		stateActive: 'active',
  		stateDisabled: 'disabled',
  
  		today: 'alert alert-info', // the plain `info` class requires `.table`, too much to ask
  
  		popover: 'panel panel-default',
  		popoverHeader: 'panel-heading',
  		popoverContent: 'panel-body',
  
  		// day grid
  		headerRow: 'panel-default', // avoid `panel` class b/c don't want margins/radius. only border color
  		dayRow: 'panel-default', // "
  
  		// list view
  		listView: 'panel panel-default'
  	},
  
  	baseIconClass: 'glyphicon',
  	iconClasses: {
  		close: 'glyphicon-remove',
  		prev: 'glyphicon-chevron-left',
  		next: 'glyphicon-chevron-right',
  		prevYear: 'glyphicon-backward',
  		nextYear: 'glyphicon-forward'
  	},
  
  	iconOverrideOption: 'bootstrapGlyphicons',
  	iconOverrideCustomButtonOption: 'bootstrapGlyphicon',
  	iconOverridePrefix: 'glyphicon-'
  
  });
  
  ThemeRegistry.register('bootstrap3', BootstrapTheme);
  
  ;;
  
  var DayGridFillRenderer = FillRenderer.extend({
  
  	fillSegTag: 'td', // override the default tag name
  
  
  	attachSegEls: function(type, segs) {
  		var nodes = [];
  		var i, seg;
  		var skeletonEl;
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  			skeletonEl = this.renderFillRow(type, seg);
  			this.component.rowEls.eq(seg.row).append(skeletonEl);
  			nodes.push(skeletonEl[0]);
  		}
  
  		return nodes;
  	},
  
  
  	// Generates the HTML needed for one row of a fill. Requires the seg's el to be rendered.
  	renderFillRow: function(type, seg) {
  		var colCnt = this.component.colCnt;
  		var startCol = seg.leftCol;
  		var endCol = seg.rightCol + 1;
  		var className;
  		var skeletonEl;
  		var trEl;
  
  		if (type === 'businessHours') {
  			className = 'bgevent';
  		}
  		else {
  			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.component.bookendCells(trEl);
  
  		return skeletonEl;
  	}
  });
  
  ;;
  
  /* Event-rendering methods for the DayGrid class
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var DayGridEventRenderer = EventRenderer.extend({
  
  	dayGrid: null,
  	rowStructs: null, // an array of objects, each holding information about a row's foreground event-rendering
  
  
  	constructor: function(dayGrid) {
  		EventRenderer.apply(this, arguments);
  
  		this.dayGrid = dayGrid;
  	},
  
  
  	renderBgRanges: function(eventRanges) {
  		// don't render timed background events
  		eventRanges = $.grep(eventRanges, function(eventRange) {
  			return eventRange.eventDef.isAllDay();
  		});
  
  		EventRenderer.prototype.renderBgRanges.call(this, eventRanges);
  	},
  
  
  	// Renders the given foreground event segments onto the grid
  	renderFgSegs: function(segs) {
  		var rowStructs = this.rowStructs = this.renderSegRows(segs);
  
  		// append to each row's content skeleton
  		this.dayGrid.rowEls.each(function(i, rowNode) {
  			$(rowNode).find('.fc-content-skeleton > table').append(
  				rowStructs[i].tbodyEl
  			);
  		});
  	},
  
  
  	// 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;
  	},
  
  
  	// 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.dayGrid.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.dayGrid.bookendCells(tr);
  			tbody.append(tr);
  		}
  
  		return { // a "rowStruct"
  			row: row, // the row number
  			tbodyEl: tbody,
  			cellMatrix: cellMatrix,
  			segMatrix: segMatrix,
  			segLevels: segLevels,
  			segs: rowSegs
  		};
  	},
  
  
  	// Stacks a flat array of segments, which are all assumed to be in the same row, into subarrays of vertical levels.
  	// NOTE: modifies segs
  	buildSegLevels: function(segs) {
  		var levels = [];
  		var i, seg;
  		var j;
  
  		// Give preference to elements with certain criteria, so they have
  		// a chance to be closer to the top.
  		this.sortEventSegs(segs);
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  
  			// loop through levels, starting with the topmost, until the segment doesn't collide with other segments
  			for (j = 0; j < levels.length; j++) {
  				if (!isDaySegCollision(seg, levels[j])) {
  					break;
  				}
  			}
  			// `j` now holds the desired subrow index
  			seg.level = j;
  
  			// create new level array if needed and append segment
  			(levels[j] || (levels[j] = [])).push(seg);
  		}
  
  		// order segments left-to-right. very important if calendar is RTL
  		for (j = 0; j < levels.length; j++) {
  			levels[j].sort(compareDaySegCols);
  		}
  
  		return levels;
  	},
  
  
  	// Given a flat array of segments, return an array of sub-arrays, grouped by each segment's row
  	groupSegRows: function(segs) {
  		var segRows = [];
  		var i;
  
  		for (i = 0; i < this.dayGrid.rowCnt; i++) {
  			segRows.push([]);
  		}
  
  		for (i = 0; i < segs.length; i++) {
  			segRows[segs[i].row].push(segs[i]);
  		}
  
  		return segRows;
  	},
  
  
  	// Computes a default event time formatting string if `timeFormat` is not explicitly defined
  	computeEventTimeFormat: function() {
  		return this.opt('extraSmallTimeFormat'); // like "6p" or "6:30p"
  	},
  
  
  	// Computes a default `displayEventEnd` value if one is not expliclty defined
  	computeDisplayEventEnd: function() {
  		return this.dayGrid.colCnt === 1; // we'll likely have space if there's only one day
  	},
  
  
  	// Builds the HTML to be used for the default element for an individual segment
  	fgSegHtml: function(seg, disableResizing) {
  		var view = this.view;
  		var eventDef = seg.footprint.eventDef;
  		var isAllDay = seg.footprint.componentFootprint.isAllDay;
  		var isDraggable = view.isEventDefDraggable(eventDef);
  		var isResizableFromStart = !disableResizing && isAllDay &&
  			seg.isStart && view.isEventDefResizableFromStart(eventDef);
  		var isResizableFromEnd = !disableResizing && isAllDay &&
  			seg.isEnd && view.isEventDefResizableFromEnd(eventDef);
  		var classes = this.getSegClasses(seg, isDraggable, isResizableFromStart || isResizableFromEnd);
  		var skinCss = cssToStr(this.getSkinCss(eventDef));
  		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.getTimeText(seg.footprint);
  			if (timeText) {
  				timeHtml = '<span class="fc-time">' + htmlEscape(timeText) + '</span>';
  			}
  		}
  
  		titleHtml =
  			'<span class="fc-title">' +
  				(htmlEscape(eventDef.title || '') || '&nbsp;') + // we always want one line of height
  			'</span>';
  
  		return '<a class="' + classes.join(' ') + '"' +
  				(eventDef.url ?
  					' href="' + htmlEscape(eventDef.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>';
  	}
  
  });
  
  
  // 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;
  }
  
  ;;
  
  var DayGridHelperRenderer = HelperRenderer.extend({
  
  
  	// Renders a mock "helper" event. `sourceSeg` is the associated internal segment object. It can be null.
  	renderSegs: function(segs, sourceSeg) {
  		var helperNodes = [];
  		var rowStructs;
  
  		// TODO: not good to call eventRenderer this way
  		rowStructs = this.eventRenderer.renderSegRows(segs);
  
  		// inject each new event skeleton into each associated row
  		this.component.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 skeletonTopEl;
  			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 {
  				skeletonTopEl = rowEl.find('.fc-content-skeleton tbody');
  				if (!skeletonTopEl.length) { // when no events
  					skeletonTopEl = rowEl.find('.fc-content-skeleton table');
  				}
  
  				skeletonTop = skeletonTopEl.position().top;
  			}
  
  			skeletonEl.css('top', skeletonTop)
  				.find('table')
  					.append(rowStructs[row].tbodyEl);
  
  			rowEl.append(skeletonEl);
  			helperNodes.push(skeletonEl[0]);
  		});
  
  		return $(helperNodes); // must return the elements rendered
  	}
  
  });
  
  ;;
  
  /* A component that renders a grid of whole-days that runs horizontally. There can be multiple rows, one per week.
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var DayGrid = FC.DayGrid = InteractiveDateComponent.extend(StandardInteractionsMixin, DayTableMixin, {
  
  	eventRendererClass: DayGridEventRenderer,
  	businessHourRendererClass: BusinessHourRenderer,
  	helperRendererClass: DayGridHelperRenderer,
  	fillRendererClass: DayGridFillRenderer,
  
  	view: null, // TODO: make more general and/or remove
  	helperRenderer: null,
  
  	cellWeekNumbersVisible: false, // display week numbers in day cell?
  
  	bottomCoordPadding: 0, // hack for extending the hit area for the last row of the coordinate grid
  
  	headContainerEl: null, // div that hold's the date header
  	rowEls: null, // set of fake row elements
  	cellEls: null, // set of whole-day elements comprising the row's background
  
  	rowCoordCache: null,
  	colCoordCache: null,
  
  	// isRigid determines 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.
  	isRigid: false,
  
  	hasAllDayBusinessHours: true,
  
  
  	constructor: function(view) {
  		this.view = view; // do first, for opt calls during initialization
  
  		InteractiveDateComponent.call(this);
  	},
  
  
  	// Slices up the given span (unzoned start/end with other misc data) into an array of segments
  	componentFootprintToSegs: function(componentFootprint) {
  		var segs = this.sliceRangeByRow(componentFootprint.unzonedRange);
  		var i, seg;
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  
  			if (this.isRTL) {
  				seg.leftCol = this.daysPerRow - 1 - seg.lastRowDayIndex;
  				seg.rightCol = this.daysPerRow - 1 - seg.firstRowDayIndex;
  			}
  			else {
  				seg.leftCol = seg.firstRowDayIndex;
  				seg.rightCol = seg.lastRowDayIndex;
  			}
  		}
  
  		return segs;
  	},
  
  
  	/* Date Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	renderDates: function(dateProfile) {
  		this.dateProfile = dateProfile;
  		this.updateDayTable();
  		this.renderGrid();
  	},
  
  
  	unrenderDates: function() {
  		this.removeSegPopover();
  	},
  
  
  	// Renders the rows and columns into the component's `this.el`, which should already be assigned.
  	renderGrid: function() {
  		var view = this.view;
  		var rowCnt = this.rowCnt;
  		var colCnt = this.colCnt;
  		var html = '';
  		var row;
  		var col;
  
  		if (this.headContainerEl) {
  			this.headContainerEl.html(this.renderHeadHtml());
  		}
  
  		for (row = 0; row < rowCnt; row++) {
  			html += this.renderDayRowHtml(row, this.isRigid);
  		}
  		this.el.html(html);
  
  		this.rowEls = this.el.find('.fc-row');
  		this.cellEls = this.el.find('.fc-day, .fc-disabled-day');
  
  		this.rowCoordCache = new CoordCache({
  			els: this.rowEls,
  			isVertical: true
  		});
  		this.colCoordCache = new CoordCache({
  			els: this.cellEls.slice(0, this.colCnt), // only the first row
  			isHorizontal: true
  		});
  
  		// trigger dayRender with each cell's element
  		for (row = 0; row < rowCnt; row++) {
  			for (col = 0; col < colCnt; col++) {
  				this.publiclyTrigger('dayRender', {
  					context: view,
  					args: [
  						this.getCellDate(row, col),
  						this.getCellEl(row, col),
  						view
  					]
  				});
  			}
  		}
  	},
  
  
  	// Generates the HTML for a single row, which is a div that wraps a table.
  	// `row` is the row number.
  	renderDayRowHtml: function(row, isRigid) {
  		var theme = this.view.calendar.theme;
  		var classes = [ 'fc-row', 'fc-week', theme.getClass('dayRow') ];
  
  		if (isRigid) {
  			classes.push('fc-rigid');
  		}
  
  		return '' +
  			'<div class="' + classes.join(' ') + '">' +
  				'<div class="fc-bg">' +
  					'<table class="' + theme.getClass('tableGrid') + '">' +
  						this.renderBgTrHtml(row) +
  					'</table>' +
  				'</div>' +
  				'<div class="fc-content-skeleton">' +
  					'<table>' +
  						(this.getIsNumbersVisible() ?
  							'<thead>' +
  								this.renderNumberTrHtml(row) +
  							'</thead>' :
  							''
  							) +
  					'</table>' +
  				'</div>' +
  			'</div>';
  	},
  
  
  	getIsNumbersVisible: function() {
  		return this.getIsDayNumbersVisible() || this.cellWeekNumbersVisible;
  	},
  
  
  	getIsDayNumbersVisible: function() {
  		return this.rowCnt > 1;
  	},
  
  
  	/* Grid Number Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	renderNumberTrHtml: function(row) {
  		return '' +
  			'<tr>' +
  				(this.isRTL ? '' : this.renderNumberIntroHtml(row)) +
  				this.renderNumberCellsHtml(row) +
  				(this.isRTL ? this.renderNumberIntroHtml(row) : '') +
  			'</tr>';
  	},
  
  
  	renderNumberIntroHtml: function(row) {
  		return this.renderIntroHtml();
  	},
  
  
  	renderNumberCellsHtml: function(row) {
  		var htmls = [];
  		var col, date;
  
  		for (col = 0; col < this.colCnt; col++) {
  			date = this.getCellDate(row, col);
  			htmls.push(this.renderNumberCellHtml(date));
  		}
  
  		return htmls.join('');
  	},
  
  
  	// Generates the HTML for the <td>s of the "number" row in the DayGrid's content skeleton.
  	// The number row will only exist if either day numbers or week numbers are turned on.
  	renderNumberCellHtml: function(date) {
  		var view = this.view;
  		var html = '';
  		var isDateValid = this.dateProfile.activeUnzonedRange.containsDate(date); // TODO: called too frequently. cache somehow.
  		var isDayNumberVisible = this.getIsDayNumbersVisible() && isDateValid;
  		var classes;
  		var weekCalcFirstDoW;
  
  		if (!isDayNumberVisible && !this.cellWeekNumbersVisible) {
  			// no numbers in day cell (week number must be along the side)
  			return '<td/>'; //  will create an empty space above events :(
  		}
  
  		classes = this.getDayClasses(date);
  		classes.unshift('fc-day-top');
  
  		if (this.cellWeekNumbersVisible) {
  			// To determine the day of week number change under ISO, we cannot
  			// rely on moment.js methods such as firstDayOfWeek() or weekday(),
  			// because they rely on the locale's dow (possibly overridden by
  			// our firstDay option), which may not be Monday. We cannot change
  			// dow, because that would affect the calendar start day as well.
  			if (date._locale._fullCalendar_weekCalc === 'ISO') {
  				weekCalcFirstDoW = 1;  // Monday by ISO 8601 definition
  			}
  			else {
  				weekCalcFirstDoW = date._locale.firstDayOfWeek();
  			}
  		}
  
  		html += '<td class="' + classes.join(' ') + '"' +
  			(isDateValid ?
  				' data-date="' + date.format() + '"' :
  				''
  				) +
  			'>';
  
  		if (this.cellWeekNumbersVisible && (date.day() == weekCalcFirstDoW)) {
  			html += view.buildGotoAnchorHtml(
  				{ date: date, type: 'week' },
  				{ 'class': 'fc-week-number' },
  				date.format('w') // inner HTML
  			);
  		}
  
  		if (isDayNumberVisible) {
  			html += view.buildGotoAnchorHtml(
  				date,
  				{ 'class': 'fc-day-number' },
  				date.date() // inner HTML
  			);
  		}
  
  		html += '</td>';
  
  		return html;
  	},
  
  
  	/* Hit System
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	prepareHits: function() {
  		this.colCoordCache.build();
  		this.rowCoordCache.build();
  		this.rowCoordCache.bottoms[this.rowCnt - 1] += this.bottomCoordPadding; // hack
  	},
  
  
  	releaseHits: function() {
  		this.colCoordCache.clear();
  		this.rowCoordCache.clear();
  	},
  
  
  	queryHit: function(leftOffset, topOffset) {
  		if (this.colCoordCache.isLeftInBounds(leftOffset) && this.rowCoordCache.isTopInBounds(topOffset)) {
  			var col = this.colCoordCache.getHorizontalIndex(leftOffset);
  			var row = this.rowCoordCache.getVerticalIndex(topOffset);
  
  			if (row != null && col != null) {
  				return this.getCellHit(row, col);
  			}
  		}
  	},
  
  
  	getHitFootprint: function(hit) {
  		var range = this.getCellRange(hit.row, hit.col);
  
  		return new ComponentFootprint(
  			new UnzonedRange(range.start, range.end),
  			true // all-day?
  		);
  	},
  
  
  	getHitEl: function(hit) {
  		return this.getCellEl(hit.row, hit.col);
  	},
  
  
  	/* Cell System
  	------------------------------------------------------------------------------------------------------------------*/
  	// FYI: the first column is the leftmost column, regardless of date
  
  
  	getCellHit: function(row, col) {
  		return {
  			row: row,
  			col: col,
  			component: this, // needed unfortunately :(
  			left: this.colCoordCache.getLeftOffset(col),
  			right: this.colCoordCache.getRightOffset(col),
  			top: this.rowCoordCache.getTopOffset(row),
  			bottom: this.rowCoordCache.getBottomOffset(row)
  		};
  	},
  
  
  	getCellEl: function(row, col) {
  		return this.cellEls.eq(row * this.colCnt + col);
  	},
  
  
  	/* Event Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Unrenders all events currently rendered on the grid
  	unrenderEvents: function() {
  		this.removeSegPopover(); // removes the "more.." events popover
  
  		InteractiveDateComponent.prototype.unrenderEvents.apply(this, arguments);
  	},
  
  
  	// Retrieves all rendered segment objects currently rendered on the grid
  	getOwnEventSegs: function() {
  		return InteractiveDateComponent.prototype.getOwnEventSegs.apply(this, arguments) // get the segments from the super-method
  			.concat(this.popoverSegs || []); // append the segments from the "more..." popover
  	},
  
  
  	/* Event Drag Visualization
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders a visual indication of an event or external element being dragged.
  	// `eventLocation` has zoned start and end (optional)
  	renderDrag: function(eventFootprints, seg, isTouch) {
  		var i;
  
  		for (i = 0; i < eventFootprints.length; i++) {
  			this.renderHighlight(eventFootprints[i].componentFootprint);
  		}
  
  		// render drags from OTHER components as helpers
  		if (eventFootprints.length && seg && seg.component !== this) {
  			this.helperRenderer.renderEventDraggingFootprints(eventFootprints, seg, isTouch);
  
  			return true; // signal helpers rendered
  		}
  	},
  
  
  	// Unrenders any visual indication of a hovering event
  	unrenderDrag: function(seg) {
  		this.unrenderHighlight();
  		this.helperRenderer.unrender();
  	},
  
  
  	/* Event Resize Visualization
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders a visual indication of an event being resized
  	renderEventResize: function(eventFootprints, seg, isTouch) {
  		var i;
  
  		for (i = 0; i < eventFootprints.length; i++) {
  			this.renderHighlight(eventFootprints[i].componentFootprint);
  		}
  
  		this.helperRenderer.renderEventResizingFootprints(eventFootprints, seg, isTouch);
  	},
  
  
  	// Unrenders a visual indication of an event being resized
  	unrenderEventResize: function(seg) {
  		this.unrenderHighlight();
  		this.helperRenderer.unrender();
  	}
  
  });
  
  ;;
  
  /* 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.eventRenderer.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.eventRenderer.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.eventRenderer.rowStructs[row];
  		var moreNodes = []; // array of "more" <a> links and <td> DOM nodes
  		var col = 0; // col #, left-to-right (not chronologically)
  		var levelSegs; // array of segment objects in the last allowable level, ordered left-to-right
  		var cellMatrix; // a matrix (by level, then column) of all <td> jQuery elements in the row
  		var limitedNodes; // array of temporarily hidden level <tr> and segment <td> DOM nodes
  		var i, seg;
  		var segsBelow; // array of segment objects below `seg` in the current `col`
  		var totalSegsBelow; // total number of segments below `seg` in any of the columns `seg` occupies
  		var colSegsBelow; // array of segment arrays, below seg, one for each column (offset from segs's first column)
  		var td, rowspan;
  		var segMoreNodes; // array of "more" <td> cells that will stand-in for the current seg's cell
  		var j;
  		var moreTd, moreWrap, moreLink;
  
  		// Iterates through empty level cells and places "more" links inside if need be
  		function emptyCellsUntil(endCol) { // goes from current `col` to `endCol`
  			while (col < endCol) {
  				segsBelow = _this.getCellSegs(row, col, levelLimit);
  				if (segsBelow.length) {
  					td = cellMatrix[levelLimit - 1][col];
  					moreLink = _this.renderMoreLink(row, col, segsBelow);
  					moreWrap = $('<div/>').append(moreLink);
  					td.append(moreWrap);
  					moreNodes.push(moreWrap[0]);
  				}
  				col++;
  			}
  		}
  
  		if (levelLimit && levelLimit < rowStruct.segLevels.length) { // is it actually over the limit?
  			levelSegs = rowStruct.segLevels[levelLimit - 1];
  			cellMatrix = rowStruct.cellMatrix;
  
  			limitedNodes = rowStruct.tbodyEl.children().slice(levelLimit) // get level <tr> elements past the limit
  				.addClass('fc-limited').get(); // hide elements and get a simple DOM-nodes array
  
  			// iterate though segments in the last allowable level
  			for (i = 0; i < levelSegs.length; i++) {
  				seg = levelSegs[i];
  				emptyCellsUntil(seg.leftCol); // process empty cells before the segment
  
  				// determine *all* segments below `seg` that occupy the same columns
  				colSegsBelow = [];
  				totalSegsBelow = 0;
  				while (col <= seg.rightCol) {
  					segsBelow = this.getCellSegs(row, col, levelLimit);
  					colSegsBelow.push(segsBelow);
  					totalSegsBelow += segsBelow.length;
  					col++;
  				}
  
  				if (totalSegsBelow) { // do we need to replace this segment with one or many "more" links?
  					td = cellMatrix[levelLimit - 1][seg.leftCol]; // the segment's parent cell
  					rowspan = td.attr('rowspan') || 1;
  					segMoreNodes = [];
  
  					// make a replacement <td> for each column the segment occupies. will be one for each colspan
  					for (j = 0; j < colSegsBelow.length; j++) {
  						moreTd = $('<td class="fc-more-cell"/>').attr('rowspan', rowspan);
  						segsBelow = colSegsBelow[j];
  						moreLink = this.renderMoreLink(
  							row,
  							seg.leftCol + j,
  							[ seg ].concat(segsBelow) // count seg as hidden too
  						);
  						moreWrap = $('<div/>').append(moreLink);
  						moreTd.append(moreWrap);
  						segMoreNodes.push(moreTd[0]);
  						moreNodes.push(moreTd[0]);
  					}
  
  					td.addClass('fc-limited').after($(segMoreNodes)); // hide original <td> and inject replacements
  					limitedNodes.push(td[0]);
  				}
  			}
  
  			emptyCellsUntil(this.colCnt); // finish off the level
  			rowStruct.moreEls = $(moreNodes); // for easy undoing later
  			rowStruct.limitedEls = $(limitedNodes); // for easy undoing later
  		}
  	},
  
  
  	// Reveals all levels and removes all "more"-related elements for a grid's row.
  	// `row` is a row number.
  	unlimitRow: function(row) {
  		var rowStruct = this.eventRenderer.rowStructs[row];
  
  		if (rowStruct.moreEls) {
  			rowStruct.moreEls.remove();
  			rowStruct.moreEls = null;
  		}
  
  		if (rowStruct.limitedEls) {
  			rowStruct.limitedEls.removeClass('fc-limited');
  			rowStruct.limitedEls = null;
  		}
  	},
  
  
  	// Renders an <a> element that represents hidden event element for a cell.
  	// Responsible for attaching click handler as well.
  	renderMoreLink: function(row, col, hiddenSegs) {
  		var _this = this;
  		var view = this.view;
  
  		return $('<a class="fc-more"/>')
  			.text(
  				this.getMoreLinkText(hiddenSegs.length)
  			)
  			.on('click', function(ev) {
  				var clickOption = _this.opt('eventLimitClick');
  				var date = _this.getCellDate(row, col);
  				var moreEl = $(this);
  				var dayEl = _this.getCellEl(row, col);
  				var allSegs = _this.getCellSegs(row, col);
  
  				// rescope the segments to be within the cell's date
  				var reslicedAllSegs = _this.resliceDaySegs(allSegs, date);
  				var reslicedHiddenSegs = _this.resliceDaySegs(hiddenSegs, date);
  
  				if (typeof clickOption === 'function') {
  					// the returned value can be an atomic option
  					clickOption = _this.publiclyTrigger('eventLimitClick', {
  						context: view,
  						args: [
  							{
  								date: date.clone(),
  								dayEl: dayEl,
  								moreEl: moreEl,
  								segs: reslicedAllSegs,
  								hiddenSegs: reslicedHiddenSegs
  							},
  							ev,
  							view
  						]
  					});
  				}
  
  				if (clickOption === 'popover') {
  					_this.showSegPopover(row, col, moreEl, reslicedAllSegs);
  				}
  				else if (typeof clickOption === 'string') { // a view name
  					view.calendar.zoomTo(date, clickOption);
  				}
  			});
  	},
  
  
  	// Reveals the popover that displays all events within a cell
  	showSegPopover: function(row, col, moreLink, segs) {
  		var _this = this;
  		var view = this.view;
  		var moreWrap = moreLink.parent(); // the <div> wrapper around the <a>
  		var topEl; // the element we want to match the top coordinate of
  		var options;
  
  		if (this.rowCnt == 1) {
  			topEl = view.el; // will cause the popover to cover any sort of header
  		}
  		else {
  			topEl = this.rowEls.eq(row); // will align with top of row
  		}
  
  		options = {
  			className: 'fc-more-popover ' + view.calendar.theme.getClass('popover'),
  			content: this.renderSegPopoverContent(row, col, segs),
  			parentEl: view.el, // attach to root of view. guarantees outside of scrollbars.
  			top: topEl.offset().top,
  			autoHide: true, // when the user clicks elsewhere, hide the popover
  			viewportConstrain: this.opt('popoverViewportConstrain'),
  			hide: function() {
  				// kill everything when the popover is hidden
  				// notify events to be removed
  				if (_this.popoverSegs) {
  					_this.triggerBeforeEventSegsDestroyed(_this.popoverSegs);
  				}
  				_this.segPopover.removeElement();
  				_this.segPopover = null;
  				_this.popoverSegs = null;
  			}
  		};
  
  		// Determine horizontal coordinate.
  		// We use the moreWrap instead of the <td> to avoid border confusion.
  		if (this.isRTL) {
  			options.right = moreWrap.offset().left + moreWrap.outerWidth() + 1; // +1 to be over cell border
  		}
  		else {
  			options.left = moreWrap.offset().left - 1; // -1 to be over cell border
  		}
  
  		this.segPopover = new Popover(options);
  		this.segPopover.show();
  
  		// the popover doesn't live within the grid's container element, and thus won't get the event
  		// delegated-handlers for free. attach event-related handlers to the popover.
  		this.bindAllSegHandlersToEl(this.segPopover.el);
  
  		this.triggerAfterEventSegsRendered(segs);
  	},
  
  
  	// Builds the inner DOM contents of the segment popover
  	renderSegPopoverContent: function(row, col, segs) {
  		var view = this.view;
  		var theme = view.calendar.theme;
  		var title = this.getCellDate(row, col).format(this.opt('dayPopoverFormat'));
  		var content = $(
  			'<div class="fc-header ' + theme.getClass('popoverHeader') + '">' +
  				'<span class="fc-close ' + theme.getIconClass('close') + '"></span>' +
  				'<span class="fc-title">' +
  					htmlEscape(title) +
  				'</span>' +
  				'<div class="fc-clear"/>' +
  			'</div>' +
  			'<div class="fc-body ' + theme.getClass('popoverContent') + '">' +
  				'<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.eventRenderer.renderFgSegEls(segs, true); // disableResizing=true
  		this.popoverSegs = segs;
  
  		for (i = 0; i < segs.length; i++) {
  
  			// because segments in the popover are not part of a grid coordinate system, provide a hint to any
  			// grids that want to do drag-n-drop about which cell it came from
  			this.hitsNeeded();
  			segs[i].hit = this.getCellHit(row, col);
  			this.hitsNotNeeded();
  
  			segContainer.append(segs[i].el);
  		}
  
  		return content;
  	},
  
  
  	// Given the events within an array of segment objects, reslice them to be in a single day
  	resliceDaySegs: function(segs, dayDate) {
  		var dayStart = dayDate.clone();
  		var dayEnd = dayStart.clone().add(1, 'days');
  		var dayRange = new UnzonedRange(dayStart, dayEnd);
  		var newSegs = [];
  		var i, seg;
  		var slicedRange;
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  			slicedRange = seg.footprint.componentFootprint.unzonedRange.intersect(dayRange);
  
  			if (slicedRange) {
  				newSegs.push(
  					$.extend({}, seg, {
  						footprint: new EventFootprint(
  							new ComponentFootprint(
  								slicedRange,
  								seg.footprint.componentFootprint.isAllDay
  							),
  							seg.footprint.eventDef,
  							seg.footprint.eventInstance
  						),
  						isStart: seg.isStart && slicedRange.isStart,
  						isEnd: seg.isEnd && slicedRange.isEnd
  					})
  				);
  			}
  		}
  
  		// force an order because eventsToSegs doesn't guarantee one
  		// TODO: research if still needed
  		this.eventRenderer.sortEventSegs(newSegs);
  
  		return newSegs;
  	},
  
  
  	// Generates the text that should be inside a "more" link, given the number of events it represents
  	getMoreLinkText: function(num) {
  		var opt = this.opt('eventLimitText');
  
  		if (typeof opt === 'function') {
  			return opt(num);
  		}
  		else {
  			return '+' + num + ' ' + opt;
  		}
  	},
  
  
  	// Returns segments within a given cell.
  	// If `startLevel` is specified, returns only events including and below that level. Otherwise returns all segs.
  	getCellSegs: function(row, col, startLevel) {
  		var segMatrix = this.eventRenderer.rowStructs[row].segMatrix;
  		var level = startLevel || 0;
  		var segs = [];
  		var seg;
  
  		while (level < segMatrix.length) {
  			seg = segMatrix[level][col];
  			if (seg) {
  				segs.push(seg);
  			}
  			level++;
  		}
  
  		return segs;
  	}
  
  });
  
  ;;
  
  /* An abstract class for the "basic" views, as well as month view. Renders one or more rows of day cells.
  ----------------------------------------------------------------------------------------------------------------------*/
  // It is a manager for a DayGrid subcomponent, which does most of the heavy lifting.
  // It is responsible for managing width/height.
  
  var BasicView = FC.BasicView = View.extend({
  
  	scroller: null,
  
  	dayGridClass: DayGrid, // class the dayGrid will be instantiated from (overridable by subclasses)
  	dayGrid: null, // the main subcomponent that does most of the heavy lifting
  
  	weekNumberWidth: null, // width of all the week-number cells running down the side
  
  
  	constructor: function() {
  		View.apply(this, arguments);
  
  		this.dayGrid = this.instantiateDayGrid();
  		this.dayGrid.isRigid = this.hasRigidRows();
  
  		if (this.opt('weekNumbers')) {
  			if (this.opt('weekNumbersWithinDays')) {
  				this.dayGrid.cellWeekNumbersVisible = true;
  				this.dayGrid.colWeekNumbersVisible = false;
  			}
  			else {
  				this.dayGrid.cellWeekNumbersVisible = false;
  				this.dayGrid.colWeekNumbersVisible = true;
  			};
  		}
  
  		this.addChild(this.dayGrid);
  
  		this.scroller = new Scroller({
  			overflowX: 'hidden',
  			overflowY: 'auto'
  		});
  	},
  
  
  	// Generates the DayGrid object this view needs. Draws from this.dayGridClass
  	instantiateDayGrid: function() {
  		// generate a subclass on the fly with BasicView-specific behavior
  		// TODO: cache this subclass
  		var subclass = this.dayGridClass.extend(basicDayGridMethods);
  
  		return new subclass(this);
  	},
  
  
  	// Computes the date range that will be rendered.
  	buildRenderRange: function(currentUnzonedRange, currentRangeUnit, isRangeAllDay) {
  		var renderUnzonedRange = View.prototype.buildRenderRange.apply(this, arguments); // an UnzonedRange
  		var start = this.calendar.msToUtcMoment(renderUnzonedRange.startMs, isRangeAllDay);
  		var end = this.calendar.msToUtcMoment(renderUnzonedRange.endMs, isRangeAllDay);
  
  		// year and month views should be aligned with weeks. this is already done for week
  		if (/^(year|month)$/.test(currentRangeUnit)) {
  			start.startOf('week');
  
  			// make end-of-week if not already
  			if (end.weekday()) {
  				end.add(1, 'week').startOf('week'); // exclusively move backwards
  			}
  		}
  
  		return new UnzonedRange(start, end);
  	},
  
  
  	executeDateRender: function(dateProfile) {
  		this.dayGrid.breakOnWeeks = /year|month|week/.test(dateProfile.currentRangeUnit);
  
  		View.prototype.executeDateRender.apply(this, arguments);
  	},
  
  
  	renderSkeleton: function() {
  		var dayGridContainerEl;
  		var dayGridEl;
  
  		this.el.addClass('fc-basic-view').html(this.renderSkeletonHtml());
  
  		this.scroller.render();
  
  		dayGridContainerEl = this.scroller.el.addClass('fc-day-grid-container');
  		dayGridEl = $('<div class="fc-day-grid" />').appendTo(dayGridContainerEl);
  
  		this.el.find('.fc-body > tr > td').append(dayGridContainerEl);
  
  		this.dayGrid.headContainerEl = this.el.find('.fc-head-container');
  		this.dayGrid.setElement(dayGridEl);
  	},
  
  
  	unrenderSkeleton: function() {
  		this.dayGrid.removeElement();
  		this.scroller.destroy();
  	},
  
  
  	// Builds the HTML skeleton for the view.
  	// The day-grid component will render inside of a container defined by this HTML.
  	renderSkeletonHtml: function() {
  		var theme = this.calendar.theme;
  
  		return '' +
  			'<table class="' + theme.getClass('tableGrid') + '">' +
  				(this.opt('columnHeader') ?
  					'<thead class="fc-head">' +
  						'<tr>' +
  							'<td class="fc-head-container ' + theme.getClass('widgetHeader') + '">&nbsp;</td>' +
  						'</tr>' +
  					'</thead>' :
  					''
  					) +
  				'<tbody class="fc-body">' +
  					'<tr>' +
  						'<td class="' + theme.getClass('widgetContent') + '"></td>' +
  					'</tr>' +
  				'</tbody>' +
  			'</table>';
  	},
  
  
  	// Generates an HTML attribute string for setting the width of the week number column, if it is known
  	weekNumberStyleAttr: function() {
  		if (this.weekNumberWidth !== null) {
  			return 'style="width:' + this.weekNumberWidth + 'px"';
  		}
  		return '';
  	},
  
  
  	// Determines whether each row should have a constant height
  	hasRigidRows: function() {
  		var eventLimit = this.opt('eventLimit');
  
  		return eventLimit && typeof eventLimit !== 'number';
  	},
  
  
  	/* Dimensions
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Refreshes the horizontal dimensions of the view
  	updateSize: function(totalHeight, isAuto, isResize) {
  		var eventLimit = this.opt('eventLimit');
  		var headRowEl = this.dayGrid.headContainerEl.find('.fc-row');
  		var scrollerHeight;
  		var scrollbarWidths;
  
  		// hack to give the view some height prior to dayGrid's columns being rendered
  		// TODO: separate setting height from scroller VS dayGrid.
  		if (!this.dayGrid.rowEls) {
  			if (!isAuto) {
  				scrollerHeight = this.computeScrollerHeight(totalHeight);
  				this.scroller.setHeight(scrollerHeight);
  			}
  			return;
  		}
  
  		View.prototype.updateSize.apply(this, arguments);
  
  		if (this.dayGrid.colWeekNumbersVisible) {
  			// Make sure all week number cells running down the side have the same width.
  			// Record the width for cells created later.
  			this.weekNumberWidth = matchCellWidths(
  				this.el.find('.fc-week-number')
  			);
  		}
  
  		// reset all heights to be natural
  		this.scroller.clear();
  		uncompensateScroll(headRowEl);
  
  		this.dayGrid.removeSegPopover(); // kill the "more" popover if displayed
  
  		// is the event limit a constant level number?
  		if (eventLimit && typeof eventLimit === 'number') {
  			this.dayGrid.limitRows(eventLimit); // limit the levels first so the height can redistribute after
  		}
  
  		// distribute the height to the rows
  		// (totalHeight is a "recommended" value if isAuto)
  		scrollerHeight = this.computeScrollerHeight(totalHeight);
  		this.setGridHeight(scrollerHeight, isAuto);
  
  		// is the event limit dynamically calculated?
  		if (eventLimit && typeof eventLimit !== 'number') {
  			this.dayGrid.limitRows(eventLimit); // limit the levels after the grid's row heights have been set
  		}
  
  		if (!isAuto) { // should we force dimensions of the scroll container?
  
  			this.scroller.setHeight(scrollerHeight);
  			scrollbarWidths = this.scroller.getScrollbarWidths();
  
  			if (scrollbarWidths.left || scrollbarWidths.right) { // using scrollbars?
  
  				compensateScroll(headRowEl, scrollbarWidths);
  
  				// doing the scrollbar compensation might have created text overflow which created more height. redo
  				scrollerHeight = this.computeScrollerHeight(totalHeight);
  				this.scroller.setHeight(scrollerHeight);
  			}
  
  			// guarantees the same scrollbar widths
  			this.scroller.lockOverflow(scrollbarWidths);
  		}
  	},
  
  
  	// given a desired total height of the view, returns what the height of the scroller should be
  	computeScrollerHeight: function(totalHeight) {
  		return totalHeight -
  			subtractInnerElHeight(this.el, this.scroller.el); // everything that's NOT the scroller
  	},
  
  
  	// Sets the height of just the DayGrid component in this view
  	setGridHeight: function(height, isAuto) {
  		if (isAuto) {
  			undistributeHeight(this.dayGrid.rowEls); // let the rows be their natural height with no expanding
  		}
  		else {
  			distributeHeight(this.dayGrid.rowEls, height, true); // true = compensate for height-hogging rows
  		}
  	},
  
  
  	/* Scroll
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	computeInitialDateScroll: function() {
  		return { top: 0 };
  	},
  
  
  	queryDateScroll: function() {
  		return { top: this.scroller.getScrollTop() };
  	},
  
  
  	applyDateScroll: function(scroll) {
  		if (scroll.top !== undefined) {
  			this.scroller.setScrollTop(scroll.top);
  		}
  	}
  
  });
  
  
  // Methods that will customize the rendering behavior of the BasicView's dayGrid
  var basicDayGridMethods = { // not relly methods anymore
  
  
  	colWeekNumbersVisible: false, // display week numbers along the side?
  
  
  	// Generates the HTML that will go before the day-of week header cells
  	renderHeadIntroHtml: function() {
  		var view = this.view;
  
  		if (this.colWeekNumbersVisible) {
  			return '' +
  				'<th class="fc-week-number ' + view.calendar.theme.getClass('widgetHeader') + '" ' + view.weekNumberStyleAttr() + '>' +
  					'<span>' + // needed for matchCellWidths
  						htmlEscape(this.opt('weekNumberTitle')) +
  					'</span>' +
  				'</th>';
  		}
  
  		return '';
  	},
  
  
  	// Generates the HTML that will go before content-skeleton cells that display the day/week numbers
  	renderNumberIntroHtml: function(row) {
  		var view = this.view;
  		var weekStart = this.getCellDate(row, 0);
  
  		if (this.colWeekNumbersVisible) {
  			return '' +
  				'<td class="fc-week-number" ' + view.weekNumberStyleAttr() + '>' +
  					view.buildGotoAnchorHtml( // aside from link, important for matchCellWidths
  						{ date: weekStart, type: 'week', forceOff: this.colCnt === 1 },
  						weekStart.format('w') // inner HTML
  					) +
  				'</td>';
  		}
  
  		return '';
  	},
  
  
  	// Generates the HTML that goes before the day bg cells for each day-row
  	renderBgIntroHtml: function() {
  		var view = this.view;
  
  		if (this.colWeekNumbersVisible) {
  			return '<td class="fc-week-number ' + view.calendar.theme.getClass('widgetContent') + '" ' +
  				view.weekNumberStyleAttr() + '></td>';
  		}
  
  		return '';
  	},
  
  
  	// Generates the HTML that goes before every other type of row generated by DayGrid.
  	// Affects helper-skeleton and highlight-skeleton rows.
  	renderIntroHtml: function() {
  		var view = this.view;
  
  		if (this.colWeekNumbersVisible) {
  			return '<td class="fc-week-number" ' + view.weekNumberStyleAttr() + '></td>';
  		}
  
  		return '';
  	},
  
  
  	getIsNumbersVisible: function() {
  		return DayGrid.prototype.getIsNumbersVisible.apply(this, arguments) || this.colWeekNumbersVisible;
  	}
  
  };
  
  ;;
  
  /* A month view with day cells running in rows (one-per-week) and columns
  ----------------------------------------------------------------------------------------------------------------------*/
  
  var MonthView = FC.MonthView = BasicView.extend({
  
  
  	// Computes the date range that will be rendered.
  	buildRenderRange: function(currentUnzonedRange, currentRangeUnit, isRangeAllDay) {
  		var renderUnzonedRange = BasicView.prototype.buildRenderRange.apply(this, arguments);
  		var start = this.calendar.msToUtcMoment(renderUnzonedRange.startMs, isRangeAllDay);
  		var end = this.calendar.msToUtcMoment(renderUnzonedRange.endMs, isRangeAllDay);
  		var rowCnt;
  
  		// ensure 6 weeks
  		if (this.isFixedWeeks()) {
  			rowCnt = Math.ceil( // could be partial weeks due to hiddenDays
  				end.diff(start, 'weeks', true) // dontRound=true
  			);
  			end.add(6 - rowCnt, 'weeks');
  		}
  
  		return new UnzonedRange(start, end);
  	},
  
  
  	// Overrides the default BasicView behavior to have special multi-week auto-height logic
  	setGridHeight: function(height, isAuto) {
  
  		// if auto, make the height of each row the height that it would be if there were 6 weeks
  		if (isAuto) {
  			height *= this.rowCnt / 6;
  		}
  
  		distributeHeight(this.dayGrid.rowEls, height, !isAuto); // if auto, don't compensate for height-hogging rows
  	},
  
  
  	isFixedWeeks: function() {
  		return this.opt('fixedWeekCount');
  	},
  
  
  	isDateInOtherMonth: function(date, dateProfile) {
  		return date.month() !== moment.utc(dateProfile.currentUnzonedRange.startMs).month(); // TODO: optimize
  	}
  
  });
  
  ;;
  
  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
  	}
  };
  ;;
  
  var TimeGridFillRenderer = FillRenderer.extend({
  
  
  	attachSegEls: function(type, segs) {
  		var timeGrid = this.component;
  		var containerEls;
  
  		// TODO: more efficient lookup
  		if (type === 'bgEvent') {
  			containerEls = timeGrid.bgContainerEls;
  		}
  		else if (type === 'businessHours') {
  			containerEls = timeGrid.businessContainerEls;
  		}
  		else if (type === 'highlight') {
  			containerEls = timeGrid.highlightContainerEls;
  		}
  
  		timeGrid.updateSegVerticals(segs);
  		timeGrid.attachSegsByCol(timeGrid.groupSegsByCol(segs), containerEls);
  
  		return segs.map(function(seg) {
  			return seg.el[0];
  		});
  	}
  
  });
  
  ;;
  
  /*
  Only handles foreground segs.
  Does not own rendering. Use for low-level util methods by TimeGrid.
  */
  var TimeGridEventRenderer = EventRenderer.extend({
  
  	timeGrid: null,
  
  
  	constructor: function(timeGrid) {
  		EventRenderer.apply(this, arguments);
  
  		this.timeGrid = timeGrid;
  	},
  
  
  	renderFgSegs: function(segs) {
  		this.renderFgSegsIntoContainers(segs, this.timeGrid.fgContainerEls);
  	},
  
  
  	// Given an array of foreground segments, render a DOM element for each, computes position,
  	// and attaches to the column inner-container elements.
  	renderFgSegsIntoContainers: function(segs, containerEls) {
  		var segsByCol;
  		var col;
  
  		segsByCol = this.timeGrid.groupSegsByCol(segs);
  
  		for (col = 0; col < this.timeGrid.colCnt; col++) {
  			this.updateFgSegCoords(segsByCol[col]);
  		}
  
  		this.timeGrid.attachSegsByCol(segsByCol, containerEls);
  	},
  
  
  	unrenderFgSegs: function() {
  		if (this.fgSegs) { // hack
  			this.fgSegs.forEach(function(seg) {
  				seg.el.remove();
  			});
  		}
  	},
  
  
  	// Computes a default event time formatting string if `timeFormat` is not explicitly defined
  	computeEventTimeFormat: function() {
  		return this.opt('noMeridiemTimeFormat'); // like "6:30" (no AM/PM)
  	},
  
  
  	// Computes a default `displayEventEnd` value if one is not expliclty defined
  	computeDisplayEventEnd: function() {
  		return true;
  	},
  
  
  	// Renders the HTML for a single event segment's default rendering
  	fgSegHtml: function(seg, disableResizing) {
  		var view = this.view;
  		var calendar = view.calendar;
  		var componentFootprint = seg.footprint.componentFootprint;
  		var isAllDay = componentFootprint.isAllDay;
  		var eventDef = seg.footprint.eventDef;
  		var isDraggable = view.isEventDefDraggable(eventDef);
  		var isResizableFromStart = !disableResizing && seg.isStart && view.isEventDefResizableFromStart(eventDef);
  		var isResizableFromEnd = !disableResizing && seg.isEnd && view.isEventDefResizableFromEnd(eventDef);
  		var classes = this.getSegClasses(seg, isDraggable, isResizableFromStart || isResizableFromEnd);
  		var skinCss = cssToStr(this.getSkinCss(eventDef));
  		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 the event appears to span more than one day...
  		if (view.isMultiDayRange(componentFootprint.unzonedRange)) {
  			// 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) {
  				var zonedStart = calendar.msToMoment(seg.startMs);
  				var zonedEnd = calendar.msToMoment(seg.endMs);
  				timeText = this._getTimeText(zonedStart, zonedEnd, isAllDay);
  				fullTimeText = this._getTimeText(zonedStart, zonedEnd, isAllDay, 'LT');
  				startTimeText = this._getTimeText(zonedStart, zonedEnd, isAllDay, null, false); // displayEnd=false
  			}
  		}
  		else {
  			// Display the normal time text for the *event's* times
  			timeText = this.getTimeText(seg.footprint);
  			fullTimeText = this.getTimeText(seg.footprint, 'LT');
  			startTimeText = this.getTimeText(seg.footprint, null, false); // displayEnd=false
  		}
  
  		return '<a class="' + classes.join(' ') + '"' +
  			(eventDef.url ?
  				' href="' + htmlEscape(eventDef.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>' :
  						''
  						) +
  					(eventDef.title ?
  						'<div class="fc-title">' +
  							htmlEscape(eventDef.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>';
  	},
  
  
  	// Given segments that are assumed to all live in the *same column*,
  	// compute their verical/horizontal coordinates and assign to their elements.
  	updateFgSegCoords: function(segs) {
  		this.timeGrid.computeSegVerticals(segs); // horizontals relies on this
  		this.computeFgSegHorizontals(segs); // compute horizontal coordinates, z-index's, and reorder the array
  		this.timeGrid.assignSegVerticals(segs);
  		this.assignFgSegHorizontals(segs);
  	},
  
  
  	// Given an array of segments that are all in the same column, sets the backwardCoord and forwardCoord on each.
  	// NOTE: Also reorders the given array by date!
  	computeFgSegHorizontals: function(segs) {
  		var levels;
  		var level0;
  		var i;
  
  		this.sortEventSegs(segs); // order by certain criteria
  		levels = buildSlotSegLevels(segs);
  		computeForwardSlotSegs(levels);
  
  		if ((level0 = levels[0])) {
  
  			for (i = 0; i < level0.length; i++) {
  				computeSlotSegPressures(level0[i]);
  			}
  
  			for (i = 0; i < level0.length; i++) {
  				this.computeFgSegForwardBack(level0[i], 0, 0);
  			}
  		}
  	},
  
  
  	// Calculate seg.forwardCoord and seg.backwardCoord for the segment, where both values range
  	// from 0 to 1. If the calendar is left-to-right, the seg.backwardCoord maps to "left" and
  	// seg.forwardCoord maps to "right" (via percentage). Vice-versa if the calendar is right-to-left.
  	//
  	// The segment might be part of a "series", which means consecutive segments with the same pressure
  	// who's width is unknown until an edge has been hit. `seriesBackwardPressure` is the number of
  	// segments behind this one in the current series, and `seriesBackwardCoord` is the starting
  	// coordinate of the first segment in the series.
  	computeFgSegForwardBack: function(seg, seriesBackwardPressure, seriesBackwardCoord) {
  		var forwardSegs = seg.forwardSegs;
  		var i;
  
  		if (seg.forwardCoord === undefined) { // not already computed
  
  			if (!forwardSegs.length) {
  
  				// if there are no forward segments, this segment should butt up against the edge
  				seg.forwardCoord = 1;
  			}
  			else {
  
  				// sort highest pressure first
  				this.sortForwardSegs(forwardSegs);
  
  				// this segment's forwardCoord will be calculated from the backwardCoord of the
  				// highest-pressure forward segment.
  				this.computeFgSegForwardBack(forwardSegs[0], seriesBackwardPressure + 1, seriesBackwardCoord);
  				seg.forwardCoord = forwardSegs[0].backwardCoord;
  			}
  
  			// calculate the backwardCoord from the forwardCoord. consider the series
  			seg.backwardCoord = seg.forwardCoord -
  				(seg.forwardCoord - seriesBackwardCoord) / // available width for series
  				(seriesBackwardPressure + 1); // # of segments in the series
  
  			// use this segment's coordinates to computed the coordinates of the less-pressurized
  			// forward segments
  			for (i=0; i<forwardSegs.length; i++) {
  				this.computeFgSegForwardBack(forwardSegs[i], 0, seg.forwardCoord);
  			}
  		}
  	},
  
  
  	sortForwardSegs: function(forwardSegs) {
  		forwardSegs.sort(proxy(this, 'compareForwardSegs'));
  	},
  
  
  	// A cmp function for determining which forward segment to rely on more when computing coordinates.
  	compareForwardSegs: function(seg1, seg2) {
  		// put higher-pressure first
  		return seg2.forwardPressure - seg1.forwardPressure ||
  			// put segments that are closer to initial edge first (and favor ones with no coords yet)
  			(seg1.backwardCoord || 0) - (seg2.backwardCoord || 0) ||
  			// do normal sorting...
  			this.compareEventSegs(seg1, seg2);
  	},
  
  
  	// Given foreground event segments that have already had their position coordinates computed,
  	// assigns position-related CSS values to their elements.
  	assignFgSegHorizontals: function(segs) {
  		var i, seg;
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  			seg.el.css(this.generateFgSegHorizontalCss(seg));
  
  			// if the height is short, add a className for alternate styling
  			if (seg.bottom - seg.top < 30) {
  				seg.el.addClass('fc-short');
  			}
  		}
  	},
  
  
  	// Generates an object with CSS properties/values that should be applied to an event segment element.
  	// Contains important positioning-related properties that should be applied to any event element, customized or not.
  	generateFgSegHorizontalCss: function(seg) {
  		var shouldOverlap = this.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.timeGrid.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.timeGrid.isRTL) {
  			left = 1 - forwardCoord;
  			right = backwardCoord;
  		}
  		else {
  			left = backwardCoord;
  			right = 1 - forwardCoord;
  		}
  
  		props.zIndex = seg.level + 1; // convert from 0-base to 1-based
  		props.left = left * 100 + '%';
  		props.right = right * 100 + '%';
  
  		if (shouldOverlap && seg.forwardPressure) {
  			// add padding to the edge so that forward stacked events don't cover the resizer's icon
  			props[this.isRTL ? 'marginLeft' : 'marginRight'] = 10 * 2; // 10 is a guesstimate of the icon's width
  		}
  
  		return props;
  	}
  
  });
  
  
  // Builds an array of segments "levels". The first level will be the leftmost tier of segments if the calendar is
  // left-to-right, or the rightmost if the calendar is right-to-left. Assumes the segments are already ordered by date.
  function buildSlotSegLevels(segs) {
  	var levels = [];
  	var i, seg;
  	var j;
  
  	for (i=0; i<segs.length; i++) {
  		seg = segs[i];
  
  		// go through all the levels and stop on the first level where there are no collisions
  		for (j=0; j<levels.length; j++) {
  			if (!computeSlotSegCollisions(seg, levels[j]).length) {
  				break;
  			}
  		}
  
  		seg.level = j;
  
  		(levels[j] || (levels[j] = [])).push(seg);
  	}
  
  	return levels;
  }
  
  
  // For every segment, figure out the other segments that are in subsequent
  // levels that also occupy the same vertical space. Accumulate in seg.forwardSegs
  function computeForwardSlotSegs(levels) {
  	var i, level;
  	var j, seg;
  	var k;
  
  	for (i=0; i<levels.length; i++) {
  		level = levels[i];
  
  		for (j=0; j<level.length; j++) {
  			seg = level[j];
  
  			seg.forwardSegs = [];
  			for (k=i+1; k<levels.length; k++) {
  				computeSlotSegCollisions(seg, levels[k], seg.forwardSegs);
  			}
  		}
  	}
  }
  
  
  // Figure out which path forward (via seg.forwardSegs) results in the longest path until
  // the furthest edge is reached. The number of segments in this path will be seg.forwardPressure
  function computeSlotSegPressures(seg) {
  	var forwardSegs = seg.forwardSegs;
  	var forwardPressure = 0;
  	var i, forwardSeg;
  
  	if (seg.forwardPressure === undefined) { // not already computed
  
  		for (i=0; i<forwardSegs.length; i++) {
  			forwardSeg = forwardSegs[i];
  
  			// figure out the child's maximum forward path
  			computeSlotSegPressures(forwardSeg);
  
  			// either use the existing maximum, or use the child's forward pressure
  			// plus one (for the forwardSeg itself)
  			forwardPressure = Math.max(
  				forwardPressure,
  				1 + forwardSeg.forwardPressure
  			);
  		}
  
  		seg.forwardPressure = forwardPressure;
  	}
  }
  
  
  // Find all the segments in `otherSegs` that vertically collide with `seg`.
  // Append into an optionally-supplied `results` array and return.
  function computeSlotSegCollisions(seg, otherSegs, results) {
  	results = results || [];
  
  	for (var i=0; i<otherSegs.length; i++) {
  		if (isSlotSegCollision(seg, otherSegs[i])) {
  			results.push(otherSegs[i]);
  		}
  	}
  
  	return results;
  }
  
  
  // Do these segments occupy the same vertical space?
  function isSlotSegCollision(seg1, seg2) {
  	return seg1.bottom > seg2.top && seg1.top < seg2.bottom;
  }
  
  ;;
  
  var TimeGridHelperRenderer = HelperRenderer.extend({
  
  
  	renderSegs: function(segs, sourceSeg) {
  		var helperNodes = [];
  		var i, seg;
  		var sourceEl;
  
  		// TODO: not good to call eventRenderer this way
  		this.eventRenderer.renderFgSegsIntoContainers(
  			segs,
  			this.component.helperContainerEls
  		);
  
  		// Try to make the segment that is in the same row as sourceSeg look the same
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  
  			if (sourceSeg && sourceSeg.col === seg.col) {
  				sourceEl = sourceSeg.el;
  				seg.el.css({
  					left: sourceEl.css('left'),
  					right: sourceEl.css('right'),
  					'margin-left': sourceEl.css('margin-left'),
  					'margin-right': sourceEl.css('margin-right')
  				});
  			}
  
  			helperNodes.push(seg.el[0]);
  		}
  
  		return $(helperNodes); // must return the elements rendered
  	}
  
  });
  
  ;;
  
  /* A component that renders one or more columns of vertical time slots
  ----------------------------------------------------------------------------------------------------------------------*/
  // We mixin DayTable, even though there is only a single row of days
  
  var TimeGrid = FC.TimeGrid = InteractiveDateComponent.extend(StandardInteractionsMixin, DayTableMixin, {
  
  	eventRendererClass: TimeGridEventRenderer,
  	businessHourRendererClass: BusinessHourRenderer,
  	helperRendererClass: TimeGridHelperRenderer,
  	fillRendererClass: TimeGridFillRenderer,
  
  	view: null, // TODO: make more general and/or remove
  	helperRenderer: null,
  
  	dayRanges: null, // UnzonedRange[], of start-end of each day
  	slotDuration: null, // duration of a "slot", a distinct time segment on given day, visualized by lines
  	snapDuration: null, // granularity of time for dragging and selecting
  	snapsPerSlot: null,
  	labelFormat: null, // formatting string for times running along vertical axis
  	labelInterval: null, // duration of how often a label should be displayed for a slot
  
  	headContainerEl: null, // div that hold's the date header
  	colEls: null, // cells elements in the day-row background
  	slatContainerEl: null, // div that wraps all the slat rows
  	slatEls: null, // elements running horizontally across all columns
  	nowIndicatorEls: null,
  
  	colCoordCache: null,
  	slatCoordCache: null,
  
  	bottomRuleEl: null, // hidden by default
  	colContainerEls: null, // containers for each column
  
  	// inner-containers for each column where different types of segs live
  	fgContainerEls: null,
  	bgContainerEls: null,
  	helperContainerEls: null,
  	highlightContainerEls: null,
  	businessContainerEls: null,
  
  	// arrays of different types of displayed segments
  	helperSegs: null,
  	highlightSegs: null,
  	businessSegs: null,
  
  
  	constructor: function(view) {
  		this.view = view; // do first, for opt calls during initialization
  
  		InteractiveDateComponent.call(this); // call the super-constructor
  
  		this.processOptions();
  	},
  
  
  	// Slices up the given span (unzoned start/end with other misc data) into an array of segments
  	componentFootprintToSegs: function(componentFootprint) {
  		var segs = this.sliceRangeByTimes(componentFootprint.unzonedRange);
  		var i;
  
  		for (i = 0; i < segs.length; i++) {
  			if (this.isRTL) {
  				segs[i].col = this.daysPerRow - 1 - segs[i].dayIndex;
  			}
  			else {
  				segs[i].col = segs[i].dayIndex;
  			}
  		}
  
  		return segs;
  	},
  
  
  	/* Date Handling
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	sliceRangeByTimes: function(unzonedRange) {
  		var segs = [];
  		var segRange;
  		var dayIndex;
  
  		for (dayIndex = 0; dayIndex < this.daysPerRow; dayIndex++) {
  
  			segRange = unzonedRange.intersect(this.dayRanges[dayIndex]);
  
  			if (segRange) {
  				segs.push({
  					startMs: segRange.startMs,
  					endMs: segRange.endMs,
  					isStart: segRange.isStart,
  					isEnd: segRange.isEnd,
  					dayIndex: dayIndex
  				});
  			}
  		}
  
  		return segs;
  	},
  
  
  	/* Options
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Parses various options into properties of this object
  	processOptions: function() {
  		var slotDuration = this.opt('slotDuration');
  		var snapDuration = this.opt('snapDuration');
  		var input;
  
  		slotDuration = moment.duration(slotDuration);
  		snapDuration = snapDuration ? moment.duration(snapDuration) : slotDuration;
  
  		this.slotDuration = slotDuration;
  		this.snapDuration = snapDuration;
  		this.snapsPerSlot = slotDuration / snapDuration; // TODO: ensure an integer multiple?
  
  		// might be an array value (for TimelineView).
  		// if so, getting the most granular entry (the last one probably).
  		input = this.opt('slotLabelFormat');
  		if ($.isArray(input)) {
  			input = input[input.length - 1];
  		}
  
  		this.labelFormat = input ||
  			this.opt('smallTimeFormat'); // the computed default
  
  		input = this.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
  	},
  
  
  	/* Date Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	renderDates: function(dateProfile) {
  		this.dateProfile = dateProfile;
  		this.updateDayTable();
  		this.renderSlats();
  		this.renderColumns();
  	},
  
  
  	renderSkeleton: function() {
  		var theme = this.view.calendar.theme;
  
  		this.el.html(
  			'<div class="fc-bg"></div>' +
  			'<div class="fc-slats"></div>' +
  			'<hr class="fc-divider ' + theme.getClass('widgetHeader') + '" style="display:none" />'
  		);
  
  		this.bottomRuleEl = this.el.find('hr');
  	},
  
  
  	renderSlats: function() {
  		var theme = this.view.calendar.theme;
  
  		this.slatContainerEl = this.el.find('> .fc-slats')
  			.html(
  				'<table class="' + theme.getClass('tableGrid') + '">' +
  					this.renderSlatRowHtml() +
  				'</table>'
  			);
  
  		this.slatEls = this.slatContainerEl.find('tr');
  
  		this.slatCoordCache = new CoordCache({
  			els: this.slatEls,
  			isVertical: true
  		});
  	},
  
  
  	// Generates the HTML for the horizontal "slats" that run width-wise. Has a time axis on a side. Depends on RTL.
  	renderSlatRowHtml: function() {
  		var view = this.view;
  		var calendar = view.calendar;
  		var theme = calendar.theme;
  		var isRTL = this.isRTL;
  		var dateProfile = this.dateProfile;
  		var html = '';
  		var slotTime = moment.duration(+dateProfile.minTime); // wish there was .clone() for durations
  		var slotIterator = moment.duration(0);
  		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 < dateProfile.maxTime) {
  			slotDate = calendar.msToUtcMoment(dateProfile.renderUnzonedRange.startMs).time(slotTime);
  			isLabeled = isInt(divideDurationByDuration(slotIterator, this.labelInterval));
  
  			axisHtml =
  				'<td class="fc-axis fc-time ' + theme.getClass('widgetContent') + '" ' + view.axisStyleAttr() + '>' +
  					(isLabeled ?
  						'<span>' + // for matchCellWidths
  							htmlEscape(slotDate.format(this.labelFormat)) +
  						'</span>' :
  						''
  						) +
  				'</td>';
  
  			html +=
  				'<tr data-time="' + slotDate.format('HH:mm:ss') + '"' +
  					(isLabeled ? '' : ' class="fc-minor"') +
  					'>' +
  					(!isRTL ? axisHtml : '') +
  					'<td class="' + theme.getClass('widgetContent') + '"/>' +
  					(isRTL ? axisHtml : '') +
  				"</tr>";
  
  			slotTime.add(this.slotDuration);
  			slotIterator.add(this.slotDuration);
  		}
  
  		return html;
  	},
  
  
  	renderColumns: function() {
  		var dateProfile = this.dateProfile;
  		var theme = this.view.calendar.theme;
  
  		this.dayRanges = this.dayDates.map(function(dayDate) {
  			return new UnzonedRange(
  				dayDate.clone().add(dateProfile.minTime),
  				dayDate.clone().add(dateProfile.maxTime)
  			);
  		});
  
  		if (this.headContainerEl) {
  			this.headContainerEl.html(this.renderHeadHtml());
  		}
  
  		this.el.find('> .fc-bg').html(
  			'<table class="' + theme.getClass('tableGrid') + '">' +
  				this.renderBgTrHtml(0) + // row=0
  			'</table>'
  		);
  
  		this.colEls = this.el.find('.fc-day, .fc-disabled-day');
  
  		this.colCoordCache = new CoordCache({
  			els: this.colEls,
  			isHorizontal: true
  		});
  
  		this.renderContentSkeleton();
  	},
  
  
  	/* Content Skeleton
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders the DOM that the view's content will live in
  	renderContentSkeleton: function() {
  		var cellHtml = '';
  		var i;
  		var skeletonEl;
  
  		for (i = 0; i < this.colCnt; i++) {
  			cellHtml +=
  				'<td>' +
  					'<div class="fc-content-col">' +
  						'<div class="fc-event-container fc-helper-container"></div>' +
  						'<div class="fc-event-container"></div>' +
  						'<div class="fc-highlight-container"></div>' +
  						'<div class="fc-bgevent-container"></div>' +
  						'<div class="fc-business-container"></div>' +
  					'</div>' +
  				'</td>';
  		}
  
  		skeletonEl = $(
  			'<div class="fc-content-skeleton">' +
  				'<table>' +
  					'<tr>' + cellHtml + '</tr>' +
  				'</table>' +
  			'</div>'
  		);
  
  		this.colContainerEls = skeletonEl.find('.fc-content-col');
  		this.helperContainerEls = skeletonEl.find('.fc-helper-container');
  		this.fgContainerEls = skeletonEl.find('.fc-event-container:not(.fc-helper-container)');
  		this.bgContainerEls = skeletonEl.find('.fc-bgevent-container');
  		this.highlightContainerEls = skeletonEl.find('.fc-highlight-container');
  		this.businessContainerEls = skeletonEl.find('.fc-business-container');
  
  		this.bookendCells(skeletonEl.find('tr')); // TODO: do this on string level
  		this.el.append(skeletonEl);
  	},
  
  
  	// Given a flat array of segments, return an array of sub-arrays, grouped by each segment's col
  	groupSegsByCol: function(segs) {
  		var segsByCol = [];
  		var i;
  
  		for (i = 0; i < this.colCnt; i++) {
  			segsByCol.push([]);
  		}
  
  		for (i = 0; i < segs.length; i++) {
  			segsByCol[segs[i].col].push(segs[i]);
  		}
  
  		return segsByCol;
  	},
  
  
  	// Given segments grouped by column, insert the segments' elements into a parallel array of container
  	// elements, each living within a column.
  	attachSegsByCol: function(segsByCol, containerEls) {
  		var col;
  		var segs;
  		var i;
  
  		for (col = 0; col < this.colCnt; col++) { // iterate each column grouping
  			segs = segsByCol[col];
  
  			for (i = 0; i < segs.length; i++) {
  				containerEls.eq(col).append(segs[i].el);
  			}
  		}
  	},
  
  
  	/* Now Indicator
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	getNowIndicatorUnit: function() {
  		return 'minute'; // will refresh on the minute
  	},
  
  
  	renderNowIndicator: function(date) {
  		// seg system might be overkill, but it handles scenario where line needs to be rendered
  		//  more than once because of columns with the same date (resources columns for example)
  		var segs = this.componentFootprintToSegs(
  			new ComponentFootprint(
  				new UnzonedRange(date, date.valueOf() + 1), // protect against null range
  				false // all-day
  			)
  		);
  		var top = this.computeDateTop(date, date);
  		var nodes = [];
  		var i;
  
  		// render lines within the columns
  		for (i = 0; i < segs.length; i++) {
  			nodes.push($('<div class="fc-now-indicator fc-now-indicator-line"></div>')
  				.css('top', top)
  				.appendTo(this.colContainerEls.eq(segs[i].col))[0]);
  		}
  
  		// render an arrow over the axis
  		if (segs.length > 0) { // is the current time in view?
  			nodes.push($('<div class="fc-now-indicator fc-now-indicator-arrow"></div>')
  				.css('top', top)
  				.appendTo(this.el.find('.fc-content-skeleton'))[0]);
  		}
  
  		this.nowIndicatorEls = $(nodes);
  	},
  
  
  	unrenderNowIndicator: function() {
  		if (this.nowIndicatorEls) {
  			this.nowIndicatorEls.remove();
  			this.nowIndicatorEls = null;
  		}
  	},
  
  
  	/* Coordinates
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	updateSize: function(totalHeight, isAuto, isResize) {
  		InteractiveDateComponent.prototype.updateSize.apply(this, arguments);
  
  		this.slatCoordCache.build();
  
  		if (isResize) {
  			this.updateSegVerticals(
  				[].concat(this.eventRenderer.getSegs(), this.businessSegs || [])
  			);
  		}
  	},
  
  
  	getTotalSlatHeight: function() {
  		return this.slatContainerEl.outerHeight();
  	},
  
  
  	// Computes the top coordinate, relative to the bounds of the grid, of the given date.
  	// `ms` can be a millisecond UTC time OR a UTC moment.
  	// A `startOfDayDate` must be given for avoiding ambiguity over how to treat midnight.
  	computeDateTop: function(ms, startOfDayDate) {
  		return this.computeTimeTop(
  			moment.duration(
  				ms - startOfDayDate.clone().stripTime()
  			)
  		);
  	},
  
  
  	// Computes the top coordinate, relative to the bounds of the grid, of the given time (a Duration).
  	computeTimeTop: function(time) {
  		var len = this.slatEls.length;
  		var dateProfile = this.dateProfile;
  		var slatCoverage = (time - dateProfile.minTime) / this.slotDuration; // floating-point value of # of slots covered
  		var slatIndex;
  		var slatRemainder;
  
  		// compute a floating-point number for how many slats should be progressed through.
  		// from 0 to number of slats (inclusive)
  		// constrained because minTime/maxTime might be customized.
  		slatCoverage = Math.max(0, slatCoverage);
  		slatCoverage = Math.min(len, slatCoverage);
  
  		// an integer index of the furthest whole slat
  		// from 0 to number slats (*exclusive*, so len-1)
  		slatIndex = Math.floor(slatCoverage);
  		slatIndex = Math.min(slatIndex, len - 1);
  
  		// how much further through the slatIndex slat (from 0.0-1.0) must be covered in addition.
  		// could be 1.0 if slatCoverage is covering *all* the slots
  		slatRemainder = slatCoverage - slatIndex;
  
  		return this.slatCoordCache.getTopPosition(slatIndex) +
  			this.slatCoordCache.getHeight(slatIndex) * slatRemainder;
  	},
  
  
  	// Refreshes the CSS top/bottom coordinates for each segment element.
  	// Works when called after initial render, after a window resize/zoom for example.
  	updateSegVerticals: function(segs) {
  		this.computeSegVerticals(segs);
  		this.assignSegVerticals(segs);
  	},
  
  
  	// For each segment in an array, computes and assigns its top and bottom properties
  	computeSegVerticals: function(segs) {
  		var eventMinHeight = this.opt('agendaEventMinHeight');
  		var i, seg;
  		var dayDate;
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  			dayDate = this.dayDates[seg.dayIndex];
  
  			seg.top = this.computeDateTop(seg.startMs, dayDate);
  			seg.bottom = Math.max(
  				seg.top + eventMinHeight,
  				this.computeDateTop(seg.endMs, dayDate)
  			);
  		}
  	},
  
  
  	// Given segments that already have their top/bottom properties computed, applies those values to
  	// the segments' elements.
  	assignSegVerticals: function(segs) {
  		var i, seg;
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  			seg.el.css(this.generateSegVerticalCss(seg));
  		}
  	},
  
  
  	// Generates an object with CSS properties for the top/bottom coordinates of a segment element
  	generateSegVerticalCss: function(seg) {
  		return {
  			top: seg.top,
  			bottom: -seg.bottom // flipped because needs to be space beyond bottom edge of event container
  		};
  	},
  
  
  	/* Hit System
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	prepareHits: function() {
  		this.colCoordCache.build();
  		this.slatCoordCache.build();
  	},
  
  
  	releaseHits: function() {
  		this.colCoordCache.clear();
  		// NOTE: don't clear slatCoordCache because we rely on it for computeTimeTop
  	},
  
  
  	queryHit: function(leftOffset, topOffset) {
  		var snapsPerSlot = this.snapsPerSlot;
  		var colCoordCache = this.colCoordCache;
  		var slatCoordCache = this.slatCoordCache;
  
  		if (colCoordCache.isLeftInBounds(leftOffset) && slatCoordCache.isTopInBounds(topOffset)) {
  			var colIndex = colCoordCache.getHorizontalIndex(leftOffset);
  			var slatIndex = slatCoordCache.getVerticalIndex(topOffset);
  
  			if (colIndex != null && slatIndex != null) {
  				var slatTop = slatCoordCache.getTopOffset(slatIndex);
  				var slatHeight = slatCoordCache.getHeight(slatIndex);
  				var partial = (topOffset - slatTop) / slatHeight; // floating point number between 0 and 1
  				var localSnapIndex = Math.floor(partial * snapsPerSlot); // the snap # relative to start of slat
  				var snapIndex = slatIndex * snapsPerSlot + localSnapIndex;
  				var snapTop = slatTop + (localSnapIndex / snapsPerSlot) * slatHeight;
  				var snapBottom = slatTop + ((localSnapIndex + 1) / snapsPerSlot) * slatHeight;
  
  				return {
  					col: colIndex,
  					snap: snapIndex,
  					component: this, // needed unfortunately :(
  					left: colCoordCache.getLeftOffset(colIndex),
  					right: colCoordCache.getRightOffset(colIndex),
  					top: snapTop,
  					bottom: snapBottom
  				};
  			}
  		}
  	},
  
  
  	getHitFootprint: function(hit) {
  		var start = this.getCellDate(0, hit.col); // row=0
  		var time = this.computeSnapTime(hit.snap); // pass in the snap-index
  		var end;
  
  		start.time(time);
  		end = start.clone().add(this.snapDuration);
  
  		return new ComponentFootprint(
  			new UnzonedRange(start, end),
  			false // all-day?
  		);
  	},
  
  
  	// Given a row number of the grid, representing a "snap", returns a time (Duration) from its start-of-day
  	computeSnapTime: function(snapIndex) {
  		return moment.duration(this.dateProfile.minTime + this.snapDuration * snapIndex);
  	},
  
  
  	getHitEl: function(hit) {
  		return this.colEls.eq(hit.col);
  	},
  
  
  	/* Event Drag Visualization
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders a visual indication of an event being dragged over the specified date(s).
  	// A returned value of `true` signals that a mock "helper" event has been rendered.
  	renderDrag: function(eventFootprints, seg, isTouch) {
  		var i;
  
  		if (seg) { // if there is event information for this drag, render a helper event
  
  			if (eventFootprints.length) {
  				this.helperRenderer.renderEventDraggingFootprints(eventFootprints, seg, isTouch);
  
  				// signal that a helper has been rendered
  				return true;
  			}
  		}
  		else { // otherwise, just render a highlight
  
  			for (i = 0; i < eventFootprints.length; i++) {
  				this.renderHighlight(eventFootprints[i].componentFootprint);
  			}
  		}
  	},
  
  
  	// Unrenders any visual indication of an event being dragged
  	unrenderDrag: function(seg) {
  		this.unrenderHighlight();
  		this.helperRenderer.unrender();
  	},
  
  
  	/* Event Resize Visualization
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders a visual indication of an event being resized
  	renderEventResize: function(eventFootprints, seg, isTouch) {
  		this.helperRenderer.renderEventResizingFootprints(eventFootprints, seg, isTouch);
  	},
  
  
  	// Unrenders any visual indication of an event being resized
  	unrenderEventResize: function(seg) {
  		this.helperRenderer.unrender();
  	},
  
  
  	/* Selection
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders a visual indication of a selection. Overrides the default, which was to simply render a highlight.
  	renderSelectionFootprint: function(componentFootprint) {
  		if (this.opt('selectHelper')) { // this setting signals that a mock helper event should be rendered
  			this.helperRenderer.renderComponentFootprint(componentFootprint);
  		}
  		else {
  			this.renderHighlight(componentFootprint);
  		}
  	},
  
  
  	// Unrenders any visual indication of a selection
  	unrenderSelection: function() {
  		this.helperRenderer.unrender();
  		this.unrenderHighlight();
  	}
  
  });
  
  ;;
  
  /* An abstract class for all agenda-related views. Displays one more columns with time slots running vertically.
  ----------------------------------------------------------------------------------------------------------------------*/
  // Is a manager for the TimeGrid subcomponent and possibly the DayGrid subcomponent (if allDaySlot is on).
  // Responsible for managing width/height.
  
  var AgendaView = FC.AgendaView = View.extend({
  
  	scroller: null,
  
  	timeGridClass: TimeGrid, // class used to instantiate the timeGrid. subclasses can override
  	timeGrid: null, // the main time-grid subcomponent of this view
  
  	dayGridClass: DayGrid, // class used to instantiate the dayGrid. subclasses can override
  	dayGrid: null, // the "all-day" subcomponent. if all-day is turned off, this will be null
  
  	axisWidth: null, // the width of the time axis running down the side
  
  	// indicates that minTime/maxTime affects rendering
  	usesMinMaxTime: true,
  
  
  	constructor: function() {
  		View.apply(this, arguments);
  
  		this.timeGrid = this.instantiateTimeGrid();
  		this.addChild(this.timeGrid);
  
  		if (this.opt('allDaySlot')) { // should we display the "all-day" area?
  			this.dayGrid = this.instantiateDayGrid(); // the all-day subcomponent of this view
  			this.addChild(this.dayGrid);
  		}
  
  		this.scroller = new Scroller({
  			overflowX: 'hidden',
  			overflowY: 'auto'
  		});
  	},
  
  
  	// Instantiates the TimeGrid object this view needs. Draws from this.timeGridClass
  	instantiateTimeGrid: function() {
  		var subclass = this.timeGridClass.extend(agendaTimeGridMethods);
  
  		return new subclass(this);
  	},
  
  
  	// Instantiates the DayGrid object this view might need. Draws from this.dayGridClass
  	instantiateDayGrid: function() {
  		var subclass = this.dayGridClass.extend(agendaDayGridMethods);
  
  		return new subclass(this);
  	},
  
  
  	/* Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	renderSkeleton: function() {
  		var timeGridWrapEl;
  		var timeGridEl;
  
  		this.el.addClass('fc-agenda-view').html(this.renderSkeletonHtml());
  
  		this.scroller.render();
  
  		timeGridWrapEl = this.scroller.el.addClass('fc-time-grid-container');
  		timeGridEl = $('<div class="fc-time-grid" />').appendTo(timeGridWrapEl);
  
  		this.el.find('.fc-body > tr > td').append(timeGridWrapEl);
  
  		this.timeGrid.headContainerEl = this.el.find('.fc-head-container');
  		this.timeGrid.setElement(timeGridEl);
  
  		if (this.dayGrid) {
  			this.dayGrid.setElement(this.el.find('.fc-day-grid'));
  
  			// 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();
  		}
  	},
  
  
  	unrenderSkeleton: function() {
  		this.timeGrid.removeElement();
  
  		if (this.dayGrid) {
  			this.dayGrid.removeElement();
  		}
  
  		this.scroller.destroy();
  	},
  
  
  	// Builds the HTML skeleton for the view.
  	// The day-grid and time-grid components will render inside containers defined by this HTML.
  	renderSkeletonHtml: function() {
  		var theme = this.calendar.theme;
  
  		return '' +
  			'<table class="' + theme.getClass('tableGrid') + '">' +
  				(this.opt('columnHeader') ?
  					'<thead class="fc-head">' +
  						'<tr>' +
  							'<td class="fc-head-container ' + theme.getClass('widgetHeader') + '">&nbsp;</td>' +
  						'</tr>' +
  					'</thead>' :
  					''
  					) +
  				'<tbody class="fc-body">' +
  					'<tr>' +
  						'<td class="' + theme.getClass('widgetContent') + '">' +
  							(this.dayGrid ?
  								'<div class="fc-day-grid"/>' +
  								'<hr class="fc-divider ' + theme.getClass('widgetHeader') + '"/>' :
  								''
  								) +
  						'</td>' +
  					'</tr>' +
  				'</tbody>' +
  			'</table>';
  	},
  
  
  	// Generates an HTML attribute string for setting the width of the axis, if it is known
  	axisStyleAttr: function() {
  		if (this.axisWidth !== null) {
  			 return 'style="width:' + this.axisWidth + 'px"';
  		}
  		return '';
  	},
  
  
  	/* Now Indicator
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	getNowIndicatorUnit: function() {
  		return this.timeGrid.getNowIndicatorUnit();
  	},
  
  
  	/* Dimensions
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Adjusts the vertical dimensions of the view to the specified values
  	updateSize: function(totalHeight, isAuto, isResize) {
  		var eventLimit;
  		var scrollerHeight;
  		var scrollbarWidths;
  
  		View.prototype.updateSize.apply(this, arguments);
  
  		// 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'));
  
  		// hack to give the view some height prior to timeGrid's columns being rendered
  		// TODO: separate setting height from scroller VS timeGrid.
  		if (!this.timeGrid.colEls) {
  			if (!isAuto) {
  				scrollerHeight = this.computeScrollerHeight(totalHeight);
  				this.scroller.setHeight(scrollerHeight);
  			}
  			return;
  		}
  
  		// set of fake row elements that must compensate when scroller has scrollbars
  		var noScrollRowEls = this.el.find('.fc-row:not(.fc-scroller *)');
  
  		// reset all dimensions back to the original state
  		this.timeGrid.bottomRuleEl.hide(); // .show() will be called later if this <hr> is necessary
  		this.scroller.clear(); // sets height to 'auto' and clears overflow
  		uncompensateScroll(noScrollRowEls);
  
  		// limit number of events in the all-day area
  		if (this.dayGrid) {
  			this.dayGrid.removeSegPopover(); // kill the "more" popover if displayed
  
  			eventLimit = this.opt('eventLimit');
  			if (eventLimit && typeof eventLimit !== 'number') {
  				eventLimit = AGENDA_ALL_DAY_EVENT_LIMIT; // make sure "auto" goes to a real number
  			}
  			if (eventLimit) {
  				this.dayGrid.limitRows(eventLimit);
  			}
  		}
  
  		if (!isAuto) { // should we force dimensions of the scroll container?
  
  			scrollerHeight = this.computeScrollerHeight(totalHeight);
  			this.scroller.setHeight(scrollerHeight);
  			scrollbarWidths = this.scroller.getScrollbarWidths();
  
  			if (scrollbarWidths.left || scrollbarWidths.right) { // using scrollbars?
  
  				// make the all-day and header rows lines up
  				compensateScroll(noScrollRowEls, scrollbarWidths);
  
  				// the scrollbar compensation might have changed text flow, which might affect height, so recalculate
  				// and reapply the desired height to the scroller.
  				scrollerHeight = this.computeScrollerHeight(totalHeight);
  				this.scroller.setHeight(scrollerHeight);
  			}
  
  			// guarantees the same scrollbar widths
  			this.scroller.lockOverflow(scrollbarWidths);
  
  			// if there's any space below the slats, show the horizontal rule.
  			// this won't cause any new overflow, because lockOverflow already called.
  			if (this.timeGrid.getTotalSlatHeight() < scrollerHeight) {
  				this.timeGrid.bottomRuleEl.show();
  			}
  		}
  	},
  
  
  	// given a desired total height of the view, returns what the height of the scroller should be
  	computeScrollerHeight: function(totalHeight) {
  		return totalHeight -
  			subtractInnerElHeight(this.el, this.scroller.el); // everything that's NOT the scroller
  	},
  
  
  	/* Scroll
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Computes the initial pre-configured scroll state prior to allowing the user to change it
  	computeInitialDateScroll: function() {
  		var scrollTime = moment.duration(this.opt('scrollTime'));
  		var top = this.timeGrid.computeTimeTop(scrollTime);
  
  		// zoom can give weird floating-point values. rather scroll a little bit further
  		top = Math.ceil(top);
  
  		if (top) {
  			top++; // to overcome top border that slots beyond the first have. looks better
  		}
  
  		return { top: top };
  	},
  
  
  	queryDateScroll: function() {
  		return { top: this.scroller.getScrollTop() };
  	},
  
  
  	applyDateScroll: function(scroll) {
  		if (scroll.top !== undefined) {
  			this.scroller.setScrollTop(scroll.top);
  		}
  	},
  
  
  	/* Hit Areas
  	------------------------------------------------------------------------------------------------------------------*/
  	// forward all hit-related method calls to the grids (dayGrid might not be defined)
  
  
  	getHitFootprint: function(hit) {
  		// TODO: hit.component is set as a hack to identify where the hit came from
  		return hit.component.getHitFootprint(hit);
  	},
  
  
  	getHitEl: function(hit) {
  		// TODO: hit.component is set as a hack to identify where the hit came from
  		return hit.component.getHitEl(hit);
  	},
  
  
  	/* Event Rendering
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	executeEventRender: function(eventsPayload) {
  		var dayEventsPayload = {};
  		var timedEventsPayload = {};
  		var id, eventInstanceGroup;
  
  		// separate the events into all-day and timed
  		for (id in eventsPayload) {
  			eventInstanceGroup = eventsPayload[id];
  
  			if (eventInstanceGroup.getEventDef().isAllDay()) {
  				dayEventsPayload[id] = eventInstanceGroup;
  			}
  			else {
  				timedEventsPayload[id] = eventInstanceGroup;
  			}
  		}
  
  		this.timeGrid.executeEventRender(timedEventsPayload);
  
  		if (this.dayGrid) {
  			this.dayGrid.executeEventRender(dayEventsPayload);
  		}
  	},
  
  
  	/* Dragging/Resizing Routing
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// A returned value of `true` signals that a mock "helper" event has been rendered.
  	renderDrag: function(eventFootprints, seg, isTouch) {
  		var groups = groupEventFootprintsByAllDay(eventFootprints);
  		var renderedHelper = false;
  
  		renderedHelper = this.timeGrid.renderDrag(groups.timed, seg, isTouch);
  
  		if (this.dayGrid) {
  			renderedHelper = this.dayGrid.renderDrag(groups.allDay, seg, isTouch) || renderedHelper;
  		}
  
  		return renderedHelper;
  	},
  
  
  	renderEventResize: function(eventFootprints, seg, isTouch) {
  		var groups = groupEventFootprintsByAllDay(eventFootprints);
  
  		this.timeGrid.renderEventResize(groups.timed, seg, isTouch);
  
  		if (this.dayGrid) {
  			this.dayGrid.renderEventResize(groups.allDay, seg, isTouch);
  		}
  	},
  
  
  	/* Selection
  	------------------------------------------------------------------------------------------------------------------*/
  
  
  	// Renders a visual indication of a selection
  	renderSelectionFootprint: function(componentFootprint) {
  		if (!componentFootprint.isAllDay) {
  			this.timeGrid.renderSelectionFootprint(componentFootprint);
  		}
  		else if (this.dayGrid) {
  			this.dayGrid.renderSelectionFootprint(componentFootprint);
  		}
  	}
  
  });
  
  
  // Methods that will customize the rendering behavior of the AgendaView's timeGrid
  // TODO: move into TimeGrid
  var agendaTimeGridMethods = {
  
  
  	// Generates the HTML that will go before the day-of week header cells
  	renderHeadIntroHtml: function() {
  		var view = this.view;
  		var calendar = view.calendar;
  		var weekStart = calendar.msToUtcMoment(this.dateProfile.renderUnzonedRange.startMs, true);
  		var weekText;
  
  		if (this.opt('weekNumbers')) {
  			weekText = weekStart.format(this.opt('smallWeekFormat'));
  
  			return '' +
  				'<th class="fc-axis fc-week-number ' + calendar.theme.getClass('widgetHeader') + '" ' + view.axisStyleAttr() + '>' +
  					view.buildGotoAnchorHtml( // aside from link, important for matchCellWidths
  						{ date: weekStart, type: 'week', forceOff: this.colCnt > 1 },
  						htmlEscape(weekText) // inner HTML
  					) +
  				'</th>';
  		}
  		else {
  			return '<th class="fc-axis ' + calendar.theme.getClass('widgetHeader') + '" ' + view.axisStyleAttr() + '></th>';
  		}
  	},
  
  
  	// Generates the HTML that goes before the bg of the TimeGrid slot area. Long vertical column.
  	renderBgIntroHtml: function() {
  		var view = this.view;
  
  		return '<td class="fc-axis ' + view.calendar.theme.getClass('widgetContent') + '" ' + view.axisStyleAttr() + '></td>';
  	},
  
  
  	// Generates the HTML that goes before all other types of cells.
  	// Affects content-skeleton, helper-skeleton, highlight-skeleton for both the time-grid and day-grid.
  	renderIntroHtml: function() {
  		var view = this.view;
  
  		return '<td class="fc-axis" ' + view.axisStyleAttr() + '></td>';
  	}
  
  };
  
  
  // Methods that will customize the rendering behavior of the AgendaView's dayGrid
  var agendaDayGridMethods = {
  
  
  	// Generates the HTML that goes before the all-day cells
  	renderBgIntroHtml: function() {
  		var view = this.view;
  
  		return '' +
  			'<td class="fc-axis ' + view.calendar.theme.getClass('widgetContent') + '" ' + view.axisStyleAttr() + '>' +
  				'<span>' + // needed for matchCellWidths
  					view.getAllDayHtml() +
  				'</span>' +
  			'</td>';
  	},
  
  
  	// Generates the HTML that goes before all other types of cells.
  	// Affects content-skeleton, helper-skeleton, highlight-skeleton for both the time-grid and day-grid.
  	renderIntroHtml: function() {
  		var view = this.view;
  
  		return '<td class="fc-axis" ' + view.axisStyleAttr() + '></td>';
  	}
  
  };
  
  
  function groupEventFootprintsByAllDay(eventFootprints) {
  	var allDay = [];
  	var timed = [];
  	var i;
  
  	for (i = 0; i < eventFootprints.length; i++) {
  		if (eventFootprints[i].componentFootprint.isAllDay) {
  			allDay.push(eventFootprints[i]);
  		}
  		else {
  			timed.push(eventFootprints[i]);
  		}
  	}
  
  	return { allDay: allDay, timed: timed };
  }
  
  ;;
  
  var AGENDA_ALL_DAY_EVENT_LIMIT = 5;
  
  // potential nice values for the slot-duration and interval-duration
  // from largest to smallest
  var AGENDA_STOCK_SUB_DURATIONS = [
  	{ hours: 1 },
  	{ minutes: 30 },
  	{ minutes: 15 },
  	{ seconds: 30 },
  	{ seconds: 15 }
  ];
  
  fcViews.agenda = {
  	'class': AgendaView,
  	defaults: {
  		allDaySlot: true,
  		slotDuration: '00:30:00',
  		slotEventOverlap: true // a bad name. confused with overlap/constraint system
  	}
  };
  
  fcViews.agendaDay = {
  	type: 'agenda',
  	duration: { days: 1 }
  };
  
  fcViews.agendaWeek = {
  	type: 'agenda',
  	duration: { weeks: 1 }
  };
  ;;
  
  /*
  Responsible for the scroller, and forwarding event-related actions into the "grid".
  */
  var ListView = FC.ListView = View.extend({
  
  	segSelector: '.fc-list-item', // which elements accept event actions
  	//eventRendererClass is below
  	//eventPointingClass is below
  
  	scroller: null,
  	contentEl: null,
  
  	dayDates: null, // localized ambig-time moment array
  	dayRanges: null, // UnzonedRange[], of start-end of each day
  
  
  	constructor: function() {
  		View.apply(this, arguments);
  
  		this.scroller = new Scroller({
  			overflowX: 'hidden',
  			overflowY: 'auto'
  		});
  	},
  
  
  	renderSkeleton: function() {
  		this.el.addClass(
  			'fc-list-view ' +
  			this.calendar.theme.getClass('listView')
  		);
  
  		this.scroller.render();
  		this.scroller.el.appendTo(this.el);
  
  		this.contentEl = this.scroller.scrollEl; // shortcut
  	},
  
  
  	unrenderSkeleton: function() {
  		this.scroller.destroy(); // will remove the Grid too
  	},
  
  
  	updateSize: function(totalHeight, isAuto, isResize) {
  		this.scroller.setHeight(this.computeScrollerHeight(totalHeight));
  	},
  
  
  	computeScrollerHeight: function(totalHeight) {
  		return totalHeight -
  			subtractInnerElHeight(this.el, this.scroller.el); // everything that's NOT the scroller
  	},
  
  
  	renderDates: function(dateProfile) {
  		var calendar = this.calendar;
  		var dayStart = calendar.msToUtcMoment(dateProfile.renderUnzonedRange.startMs, true);
  		var viewEnd = calendar.msToUtcMoment(dateProfile.renderUnzonedRange.endMs, true);
  		var dayDates = [];
  		var dayRanges = [];
  
  		while (dayStart < viewEnd) {
  
  			dayDates.push(dayStart.clone());
  
  			dayRanges.push(new UnzonedRange(
  				dayStart,
  				dayStart.clone().add(1, 'day')
  			));
  
  			dayStart.add(1, 'day');
  		}
  
  		this.dayDates = dayDates;
  		this.dayRanges = dayRanges;
  
  		// all real rendering happens in EventRenderer
  	},
  
  
  	// slices by day
  	componentFootprintToSegs: function(footprint) {
  		var dayRanges = this.dayRanges;
  		var dayIndex;
  		var segRange;
  		var seg;
  		var segs = [];
  
  		for (dayIndex = 0; dayIndex < dayRanges.length; dayIndex++) {
  			segRange = footprint.unzonedRange.intersect(dayRanges[dayIndex]);
  
  			if (segRange) {
  				seg = {
  					startMs: segRange.startMs,
  					endMs: segRange.endMs,
  					isStart: segRange.isStart,
  					isEnd: segRange.isEnd,
  					dayIndex: dayIndex
  				};
  
  				segs.push(seg);
  
  				// detect when footprint won't go fully into the next day,
  				// and mutate the latest seg to the be the end.
  				if (
  					!seg.isEnd && !footprint.isAllDay &&
  					dayIndex + 1 < dayRanges.length &&
  					footprint.unzonedRange.endMs < dayRanges[dayIndex + 1].startMs + this.nextDayThreshold
  				) {
  					seg.endMs = footprint.unzonedRange.endMs;
  					seg.isEnd = true;
  					break;
  				}
  			}
  		}
  
  		return segs;
  	},
  
  
  	eventRendererClass: EventRenderer.extend({
  
  
  		renderFgSegs: function(segs) {
  			if (!segs.length) {
  				this.component.renderEmptyMessage();
  			}
  			else {
  				this.component.renderSegList(segs);
  			}
  		},
  
  
  		// generates the HTML for a single event row
  		fgSegHtml: function(seg) {
  			var view = this.view;
  			var calendar = view.calendar;
  			var theme = calendar.theme;
  			var eventFootprint = seg.footprint;
  			var eventDef = eventFootprint.eventDef;
  			var componentFootprint = eventFootprint.componentFootprint;
  			var url = eventDef.url;
  			var classes = [ 'fc-list-item' ].concat(this.getClasses(eventDef));
  			var bgColor = this.getBgColor(eventDef);
  			var timeHtml;
  
  			if (componentFootprint.isAllDay) {
  				timeHtml = view.getAllDayHtml();
  			}
  			// if the event appears to span more than one day
  			else if (view.isMultiDayRange(componentFootprint.unzonedRange)) {
  				if (seg.isStart || seg.isEnd) { // outer segment that probably lasts part of the day
  					timeHtml = htmlEscape(this._getTimeText(
  						calendar.msToMoment(seg.startMs),
  						calendar.msToMoment(seg.endMs),
  						componentFootprint.isAllDay
  					));
  				}
  				else { // inner segment that lasts the whole day
  					timeHtml = view.getAllDayHtml();
  				}
  			}
  			else {
  				// Display the normal time text for the *event's* times
  				timeHtml = htmlEscape(this.getTimeText(eventFootprint));
  			}
  
  			if (url) {
  				classes.push('fc-has-url');
  			}
  
  			return '<tr class="' + classes.join(' ') + '">' +
  				(this.displayEventTime ?
  					'<td class="fc-list-item-time ' + theme.getClass('widgetContent') + '">' +
  						(timeHtml || '') +
  					'</td>' :
  					'') +
  				'<td class="fc-list-item-marker ' + theme.getClass('widgetContent') + '">' +
  					'<span class="fc-event-dot"' +
  					(bgColor ?
  						' style="background-color:' + bgColor + '"' :
  						'') +
  					'></span>' +
  				'</td>' +
  				'<td class="fc-list-item-title ' + theme.getClass('widgetContent') + '">' +
  					'<a' + (url ? ' href="' + htmlEscape(url) + '"' : '') + '>' +
  						htmlEscape(eventDef.title || '') +
  					'</a>' +
  				'</td>' +
  			'</tr>';
  		},
  
  
  		// like "4:00am"
  		computeEventTimeFormat: function() {
  			return this.opt('mediumTimeFormat');
  		}
  
  	}),
  
  
  	eventPointingClass: EventPointing.extend({
  
  		// for events with a url, the whole <tr> should be clickable,
  		// but it's impossible to wrap with an <a> tag. simulate this.
  		handleClick: function(seg, ev) {
  			var url;
  
  			EventPointing.prototype.handleClick.apply(this, arguments); // super. might prevent the default action
  
  			// not clicking on or within an <a> with an href
  			if (!$(ev.target).closest('a[href]').length) {
  				url = seg.footprint.eventDef.url;
  
  				if (url && !ev.isDefaultPrevented()) { // jsEvent not cancelled in handler
  					window.location.href = url; // simulate link click
  				}
  			}
  		}
  
  	}),
  
  
  	renderEmptyMessage: function() {
  		this.contentEl.html(
  			'<div class="fc-list-empty-wrap2">' + // TODO: try less wraps
  			'<div class="fc-list-empty-wrap1">' +
  			'<div class="fc-list-empty">' +
  				htmlEscape(this.opt('noEventsMessage')) +
  			'</div>' +
  			'</div>' +
  			'</div>'
  		);
  	},
  
  
  	// render the event segments in the view
  	renderSegList: function(allSegs) {
  		var segsByDay = this.groupSegsByDay(allSegs); // sparse array
  		var dayIndex;
  		var daySegs;
  		var i;
  		var tableEl = $('<table class="fc-list-table ' + this.calendar.theme.getClass('tableList') + '"><tbody/></table>');
  		var tbodyEl = tableEl.find('tbody');
  
  		for (dayIndex = 0; dayIndex < segsByDay.length; dayIndex++) {
  			daySegs = segsByDay[dayIndex];
  
  			if (daySegs) { // sparse array, so might be undefined
  
  				// append a day header
  				tbodyEl.append(this.dayHeaderHtml(this.dayDates[dayIndex]));
  
  				this.eventRenderer.sortEventSegs(daySegs);
  
  				for (i = 0; i < daySegs.length; i++) {
  					tbodyEl.append(daySegs[i].el); // append event row
  				}
  			}
  		}
  
  		this.contentEl.empty().append(tableEl);
  	},
  
  
  	// Returns a sparse array of arrays, segs grouped by their dayIndex
  	groupSegsByDay: function(segs) {
  		var segsByDay = []; // sparse array
  		var i, seg;
  
  		for (i = 0; i < segs.length; i++) {
  			seg = segs[i];
  			(segsByDay[seg.dayIndex] || (segsByDay[seg.dayIndex] = []))
  				.push(seg);
  		}
  
  		return segsByDay;
  	},
  
  
  	// generates the HTML for the day headers that live amongst the event rows
  	dayHeaderHtml: function(dayDate) {
  		var mainFormat = this.opt('listDayFormat');
  		var altFormat = this.opt('listDayAltFormat');
  
  		return '<tr class="fc-list-heading" data-date="' + dayDate.format('YYYY-MM-DD') + '">' +
  			'<td class="' + this.calendar.theme.getClass('widgetHeader') + '" colspan="3">' +
  				(mainFormat ?
  					this.buildGotoAnchorHtml(
  						dayDate,
  						{ 'class': 'fc-list-heading-main' },
  						htmlEscape(dayDate.format(mainFormat)) // inner HTML
  					) :
  					'') +
  				(altFormat ?
  					this.buildGotoAnchorHtml(
  						dayDate,
  						{ 'class': 'fc-list-heading-alt' },
  						htmlEscape(dayDate.format(altFormat)) // inner HTML
  					) :
  					'') +
  			'</td>' +
  		'</tr>';
  	}
  
  });
  
  ;;
  
  fcViews.list = {
  	'class': ListView,
  	buttonTextKey: 'list', // what to lookup in locale files
  	defaults: {
  		buttonText: 'list', // text to display for English
  		listDayFormat: 'LL', // like "January 1, 2016"
  		noEventsMessage: 'No events to display'
  	}
  };
  
  fcViews.listDay = {
  	type: 'list',
  	duration: { days: 1 },
  	defaults: {
  		listDayFormat: 'dddd' // day-of-week is all we need. full date is probably in header
  	}
  };
  
  fcViews.listWeek = {
  	type: 'list',
  	duration: { weeks: 1 },
  	defaults: {
  		listDayFormat: 'dddd', // day-of-week is more important
  		listDayAltFormat: 'LL'
  	}
  };
  
  fcViews.listMonth = {
  	type: 'list',
  	duration: { month: 1 },
  	defaults: {
  		listDayAltFormat: 'dddd' // day-of-week is nice-to-have
  	}
  };
  
  fcViews.listYear = {
  	type: 'list',
  	duration: { year: 1 },
  	defaults: {
  		listDayAltFormat: 'dddd' // day-of-week is nice-to-have
  	}
  };
  
  ;;
  
  return FC; // export for Node/CommonJS
  });