/*!
 * FullCalendar v2.2.3
 * Docs & License: http://arshaw.com/fullcalendar/
 * (c) 2013 Adam Shaw
 */

(function(factory) {
	if (typeof define === 'function' && define.amd) {
		define([ 'jquery', 'moment' ], factory);
	}
	else {
		factory(jQuery, moment);
	}
})(function($, moment) {

;;

var defaults = {

	lang: 'en',

	defaultTimedEventDuration: '02:00:00',
	defaultAllDayEventDuration: { days: 1 },
	forceEventDuration: false,
	nextDayThreshold: '09:00:00', // 9am

	// display
	defaultView: 'month',
	aspectRatio: 1.35,
	header: {
		left: 'title',
		center: '',
		right: 'today prev,next'
	},
	weekends: true,
	weekNumbers: false,

	weekNumberTitle: 'W',
	weekNumberCalculation: 'local',
	
	//editable: false,
	
	// event ajax
	lazyFetching: true,
	startParam: 'start',
	endParam: 'end',
	timezoneParam: 'timezone',

	timezone: false,

	//allDayDefault: undefined,
	
	// time formats
	titleFormat: {
		month: 'MMMM YYYY', // like "September 1986". each language will override this
		week: 'll', // like "Sep 4 1986"
		day: 'LL' // like "September 4 1986"
	},
	columnFormat: {
		month: 'ddd', // like "Sat"
		week: generateWeekColumnFormat,
		day: 'dddd' // like "Saturday"
	},
	timeFormat: { // for event elements
		'default': generateShortTimeFormat
	},

	displayEventEnd: {
		month: false,
		basicWeek: false,
		'default': true
	},
	
	// locale
	isRTL: false,
	defaultButtonText: {
		prev: "prev",
		next: "next",
		prevYear: "prev year",
		nextYear: "next year",
		today: 'today',
		month: 'month',
		week: 'week',
		day: 'day'
	},

	buttonIcons: {
		prev: 'left-single-arrow',
		next: 'right-single-arrow',
		prevYear: 'left-double-arrow',
		nextYear: 'right-double-arrow'
	},
	
	// jquery-ui theming
	theme: false,
	themeButtonIcons: {
		prev: 'circle-triangle-w',
		next: 'circle-triangle-e',
		prevYear: 'seek-prev',
		nextYear: 'seek-next'
	},

	dragOpacity: .75,
	dragRevertDuration: 500,
	dragScroll: true,
	
	//selectable: false,
	unselectAuto: true,
	
	dropAccept: '*',

	eventLimit: false,
	eventLimitText: 'more',
	eventLimitClick: 'popover',
	dayPopoverFormat: 'LL',
	
	handleWindowResize: true,
	windowResizeDelay: 200 // milliseconds before a rerender happens
	
};


function generateShortTimeFormat(options, langData) {
	return langData.longDateFormat('LT')
		.replace(':mm', '(:mm)')
		.replace(/(\Wmm)$/, '($1)') // like above, but for foreign langs
		.replace(/\s*a$/i, 't'); // convert to AM/PM/am/pm to lowercase one-letter. remove any spaces beforehand
}


function generateWeekColumnFormat(options, langData) {
	var format = langData.longDateFormat('L'); // for the format like "MM/DD/YYYY"
	format = format.replace(/^Y+[^\w\s]*|[^\w\s]*Y+$/g, ''); // strip the year off the edge, as well as other misc non-whitespace chars
	if (options.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;
}


var langOptionHash = {
	en: {
		columnFormat: {
			week: 'ddd M/D' // override for english. different from the generated default, which is MM/DD
		},
		dayPopoverFormat: 'dddd, MMMM D'
	}
};


// right-to-left defaults
var rtlDefaults = {
	header: {
		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 fc = $.fullCalendar = { version: "2.2.3" };
var fcViews = fc.views = {};


$.fn.fullCalendar = function(options) {
	var args = Array.prototype.slice.call(arguments, 1); // for a possible method call
	var res = this; // what this function will return (this jQuery object by default)

	this.each(function(i, _element) { // loop each DOM element involved
		var element = $(_element);
		var calendar = element.data('fullCalendar'); // get the existing calendar object (if any)
		var singleRes; // the returned value of this single method call

		// a method call
		if (typeof options === 'string') {
			if (calendar && $.isFunction(calendar[options])) {
				singleRes = calendar[options].apply(calendar, args);
				if (!i) {
					res = singleRes; // record the first method call result
				}
				if (options === 'destroy') { // for the destroy method, must remove Calendar object data
					element.removeData('fullCalendar');
				}
			}
		}
		// a new calendar initialization
		else if (!calendar) { // don't initialize twice
			calendar = new Calendar(element, options);
			element.data('fullCalendar', calendar);
			calendar.render();
		}
	});
	
	return res;
};


// function for adding/overriding defaults
function setDefaults(d) {
	mergeOptions(defaults, d);
}


// Recursively combines option hash-objects.
// Better than `$.extend(true, ...)` because arrays are not traversed/copied.
//
// called like:
//     mergeOptions(target, obj1, obj2, ...)
//
function mergeOptions(target) {

	function mergeIntoTarget(name, value) {
		if ($.isPlainObject(value) && $.isPlainObject(target[name]) && !isForcedAtomicOption(name)) {
			// merge into a new object to avoid destruction
			target[name] = mergeOptions({}, target[name], value); // combine. `value` object takes precedence
		}
		else if (value !== undefined) { // only use values that are set and not undefined
			target[name] = value;
		}
	}

	for (var i=1; i<arguments.length; i++) {
		$.each(arguments[i], mergeIntoTarget);
	}

	return target;
}


// overcome sucky view-option-hash and option-merging behavior messing with options it shouldn't
function isForcedAtomicOption(name) {
	// Any option that ends in "Time" or "Duration" is probably a Duration,
	// and these will commonly be specified as plain objects, which we don't want to mess up.
	return /(Time|Duration)$/.test(name);
}
// FIX: find a different solution for view-option-hashes and have a whitelist
// for options that can be recursively merged.

;;

//var langOptionHash = {}; // initialized in defaults.js
fc.langs = langOptionHash; // expose


// Initialize jQuery UI Datepicker translations while using some of the translations
// for our own purposes. Will set this as the default language for datepicker.
// Called from a translation file.
fc.datepickerLang = function(langCode, datepickerLangCode, options) {
	var langOptions = langOptionHash[langCode];

	// initialize FullCalendar's lang hash for this language
	if (!langOptions) {
		langOptions = langOptionHash[langCode] = {};
	}

	// merge certain Datepicker options into FullCalendar's options
	mergeOptions(langOptions, {
		isRTL: options.isRTL,
		weekNumberTitle: options.weekHeader,
		titleFormat: {
			month: options.showMonthAfterYear ?
				'YYYY[' + options.yearSuffix + '] MMMM' :
				'MMMM YYYY[' + options.yearSuffix + ']'
		},
		defaultButtonText: {
			// the translations sometimes wrongly contain HTML entities
			prev: stripHtmlEntities(options.prevText),
			next: stripHtmlEntities(options.nextText),
			today: stripHtmlEntities(options.currentText)
		}
	});

	// is jQuery UI Datepicker is on the page?
	if ($.datepicker) {

		// Register the language data.
		// FullCalendar and MomentJS use language codes like "pt-br" but Datepicker
		// does it like "pt-BR" or if it doesn't have the language, maybe just "pt".
		// Make an alias so the language can be referenced either way.
		$.datepicker.regional[datepickerLangCode] =
			$.datepicker.regional[langCode] = // alias
				options;

		// Alias 'en' to the default language data. Do this every time.
		$.datepicker.regional.en = $.datepicker.regional[''];

		// Set as Datepicker's global defaults.
		$.datepicker.setDefaults(options);
	}
};


// Sets FullCalendar-specific translations. Also sets the language as the global default.
// Called from a translation file.
fc.lang = function(langCode, options) {
	var langOptions;

	if (options) {
		langOptions = langOptionHash[langCode];

		// initialize the hash for this language
		if (!langOptions) {
			langOptions = langOptionHash[langCode] = {};
		}

		mergeOptions(langOptions, options || {});
	}

	// set it as the default language for FullCalendar
	defaults.lang = langCode;
};
;;

 
function Calendar(element, instanceOptions) {
	var t = this;



	// Build options object
	// -----------------------------------------------------------------------------------
	// Precedence (lowest to highest): defaults, rtlDefaults, langOptions, instanceOptions

	instanceOptions = instanceOptions || {};

	var options = mergeOptions({}, defaults, instanceOptions);
	var langOptions;

	// determine language options
	if (options.lang in langOptionHash) {
		langOptions = langOptionHash[options.lang];
	}
	else {
		langOptions = langOptionHash[defaults.lang];
	}

	if (langOptions) { // if language options exist, rebuild...
		options = mergeOptions({}, defaults, langOptions, instanceOptions);
	}

	if (options.isRTL) { // is isRTL, rebuild...
		options = mergeOptions({}, defaults, rtlDefaults, langOptions || {}, instanceOptions);
	}


	
	// Exports
	// -----------------------------------------------------------------------------------

	t.options = options;
	t.render = render;
	t.destroy = destroy;
	t.refetchEvents = refetchEvents;
	t.reportEvents = reportEvents;
	t.reportEventChange = reportEventChange;
	t.rerenderEvents = renderEvents; // `renderEvents` serves as a rerender. an API method
	t.changeView = changeView;
	t.select = select;
	t.unselect = unselect;
	t.prev = prev;
	t.next = next;
	t.prevYear = prevYear;
	t.nextYear = nextYear;
	t.today = today;
	t.gotoDate = gotoDate;
	t.incrementDate = incrementDate;
	t.zoomTo = zoomTo;
	t.getDate = getDate;
	t.getCalendar = getCalendar;
	t.getView = getView;
	t.option = option;
	t.trigger = trigger;



	// Language-data Internals
	// -----------------------------------------------------------------------------------
	// Apply overrides to the current language's data


	// Returns moment's internal locale data. If doesn't exist, returns English.
	// Works with moment-pre-2.8
	function getLocaleData(langCode) {
		var f = moment.localeData || moment.langData;
		return f.call(moment, langCode) ||
			f.call(moment, 'en'); // the newer localData could return null, so fall back to en
	}


	var localeData = createObject(getLocaleData(options.lang)); // make a cheap copy

	if (options.monthNames) {
		localeData._months = options.monthNames;
	}
	if (options.monthNamesShort) {
		localeData._monthsShort = options.monthNamesShort;
	}
	if (options.dayNames) {
		localeData._weekdays = options.dayNames;
	}
	if (options.dayNamesShort) {
		localeData._weekdaysShort = options.dayNamesShort;
	}
	if (options.firstDay != null) {
		var _week = createObject(localeData._week); // _week: { dow: # }
		_week.dow = options.firstDay;
		localeData._week = _week;
	}



	// Calendar-specific Date Utilities
	// -----------------------------------------------------------------------------------


	t.defaultAllDayEventDuration = moment.duration(options.defaultAllDayEventDuration);
	t.defaultTimedEventDuration = moment.duration(options.defaultTimedEventDuration);


	// Builds a moment using the settings of the current calendar: timezone and language.
	// Accepts anything the vanilla moment() constructor accepts.
	t.moment = function() {
		var mom;

		if (options.timezone === 'local') {
			mom = fc.moment.apply(null, arguments);

			// Force the moment to be local, because fc.moment doesn't guarantee it.
			if (mom.hasTime()) { // don't give ambiguously-timed moments a local zone
				mom.local();
			}
		}
		else if (options.timezone === 'UTC') {
			mom = fc.moment.utc.apply(null, arguments); // process as UTC
		}
		else {
			mom = fc.moment.parseZone.apply(null, arguments); // let the input decide the zone
		}

		if ('_locale' in mom) { // moment 2.8 and above
			mom._locale = localeData;
		}
		else { // pre-moment-2.8
			mom._lang = localeData;
		}

		return mom;
	};


	// Returns a boolean about whether or not the calendar knows how to calculate
	// the timezone offset of arbitrary dates in the current timezone.
	t.getIsAmbigTimezone = function() {
		return options.timezone !== 'local' && options.timezone !== 'UTC';
	};


	// Returns a copy of the given date in the current timezone of it is ambiguously zoned.
	// This will also give the date an unambiguous time.
	t.rezoneDate = function(date) {
		return t.moment(date.toArray());
	};


	// Returns a moment for the current date, as defined by the client's computer,
	// or overridden by the `now` option.
	t.getNow = function() {
		var now = options.now;
		if (typeof now === 'function') {
			now = now();
		}
		return t.moment(now);
	};


	// Calculates the week number for a moment according to the calendar's
	// `weekNumberCalculation` setting.
	t.calculateWeekNumber = function(mom) {
		var calc = options.weekNumberCalculation;

		if (typeof calc === 'function') {
			return calc(mom);
		}
		else if (calc === 'local') {
			return mom.week();
		}
		else if (calc.toUpperCase() === 'ISO') {
			return mom.isoWeek();
		}
	};


	// Get an event's normalized end date. If not present, calculate it from the defaults.
	t.getEventEnd = function(event) {
		if (event.end) {
			return event.end.clone();
		}
		else {
			return t.getDefaultEventEnd(event.allDay, event.start);
		}
	};


	// Given an event's allDay status and start date, return swhat its fallback end date should be.
	t.getDefaultEventEnd = function(allDay, start) { // TODO: rename to computeDefaultEventEnd
		var end = start.clone();

		if (allDay) {
			end.stripTime().add(t.defaultAllDayEventDuration);
		}
		else {
			end.add(t.defaultTimedEventDuration);
		}

		if (t.getIsAmbigTimezone()) {
			end.stripZone(); // we don't know what the tzo should be
		}

		return end;
	};



	// Date-formatting Utilities
	// -----------------------------------------------------------------------------------


	// Like the vanilla formatRange, but with calendar-specific settings applied.
	t.formatRange = function(m1, m2, formatStr) {

		// a function that returns a formatStr // TODO: in future, precompute this
		if (typeof formatStr === 'function') {
			formatStr = formatStr.call(t, options, localeData);
		}

		return formatRange(m1, m2, formatStr, null, options.isRTL);
	};


	// Like the vanilla formatDate, but with calendar-specific settings applied.
	t.formatDate = function(mom, formatStr) {

		// a function that returns a formatStr // TODO: in future, precompute this
		if (typeof formatStr === 'function') {
			formatStr = formatStr.call(t, options, localeData);
		}

		return formatDate(mom, formatStr);
	};


	
	// Imports
	// -----------------------------------------------------------------------------------


	EventManager.call(t, options);
	var isFetchNeeded = t.isFetchNeeded;
	var fetchEvents = t.fetchEvents;



	// Locals
	// -----------------------------------------------------------------------------------


	var _element = element[0];
	var header;
	var headerElement;
	var content;
	var tm; // for making theme classes
	var currentView;
	var suggestedViewHeight;
	var windowResizeProxy; // wraps the windowResize function
	var ignoreWindowResize = 0;
	var date;
	var events = [];
	
	
	
	// Main Rendering
	// -----------------------------------------------------------------------------------


	if (options.defaultDate != null) {
		date = t.moment(options.defaultDate);
	}
	else {
		date = t.getNow();
	}
	
	
	function render(inc) {
		if (!content) {
			initialRender();
		}
		else if (elementVisible()) {
			// mainly for the public API
			calcSize();
			renderView(inc);
		}
	}
	
	
	function initialRender() {
		tm = options.theme ? 'ui' : 'fc';
		element.addClass('fc');

		if (options.isRTL) {
			element.addClass('fc-rtl');
		}
		else {
			element.addClass('fc-ltr');
		}

		if (options.theme) {
			element.addClass('ui-widget');
		}
		else {
			element.addClass('fc-unthemed');
		}

		content = $("<div class='fc-view-container'/>").prependTo(element);

		header = new Header(t, options);
		headerElement = header.render();
		if (headerElement) {
			element.prepend(headerElement);
		}

		changeView(options.defaultView);

		if (options.handleWindowResize) {
			windowResizeProxy = debounce(windowResize, options.windowResizeDelay); // prevents rapid calls
			$(window).resize(windowResizeProxy);
		}
	}
	
	
	function destroy() {

		if (currentView) {
			currentView.destroy();
		}

		header.destroy();
		content.remove();
		element.removeClass('fc fc-ltr fc-rtl fc-unthemed ui-widget');

		$(window).unbind('resize', windowResizeProxy);
	}
	
	
	function elementVisible() {
		return element.is(':visible');
	}
	
	

	// View Rendering
	// -----------------------------------------------------------------------------------


	function changeView(viewName) {
		renderView(0, viewName);
	}


	// Renders a view because of a date change, view-type change, or for the first time
	function renderView(delta, viewName) {
		ignoreWindowResize++;

		// if viewName is changing, destroy the old view
		if (currentView && viewName && currentView.name !== viewName) {
			header.deactivateButton(currentView.name);
			freezeContentHeight(); // prevent a scroll jump when view element is removed
			if (currentView.start) { // rendered before?
				currentView.destroy();
			}
			currentView.el.remove();
			currentView = null;
		}

		// if viewName changed, or the view was never created, create a fresh view
		if (!currentView && viewName) {
			currentView = new fcViews[viewName](t);
			currentView.el =  $("<div class='fc-view fc-" + viewName + "-view' />").appendTo(content);
			header.activateButton(viewName);
		}

		if (currentView) {

			// let the view determine what the delta means
			if (delta) {
				date = currentView.incrementDate(date, delta);
			}

			// render or rerender the view
			if (
				!currentView.start || // never rendered before
				delta || // explicit date window change
				!date.isWithin(currentView.intervalStart, currentView.intervalEnd) // implicit date window change
			) {
				if (elementVisible()) {

					freezeContentHeight();
					if (currentView.start) { // rendered before?
						currentView.destroy();
					}
					currentView.render(date);
					unfreezeContentHeight();

					// need to do this after View::render, so dates are calculated
					updateTitle();
					updateTodayButton();

					getAndRenderEvents();
				}
			}
		}

		unfreezeContentHeight(); // undo any lone freezeContentHeight calls
		ignoreWindowResize--;
	}
	
	

	// Resizing
	// -----------------------------------------------------------------------------------


	t.getSuggestedViewHeight = function() {
		if (suggestedViewHeight === undefined) {
			calcSize();
		}
		return suggestedViewHeight;
	};


	t.isHeightAuto = function() {
		return options.contentHeight === 'auto' || options.height === 'auto';
	};
	
	
	function updateSize(shouldRecalc) {
		if (elementVisible()) {

			if (shouldRecalc) {
				_calcSize();
			}

			ignoreWindowResize++;
			currentView.updateSize(true); // isResize=true. will poll getSuggestedViewHeight() and isHeightAuto()
			ignoreWindowResize--;

			return true; // signal success
		}
	}


	function calcSize() {
		if (elementVisible()) {
			_calcSize();
		}
	}
	
	
	function _calcSize() { // assumes elementVisible
		if (typeof options.contentHeight === 'number') { // exists and not 'auto'
			suggestedViewHeight = options.contentHeight;
		}
		else if (typeof options.height === 'number') { // exists and not 'auto'
			suggestedViewHeight = options.height - (headerElement ? headerElement.outerHeight(true) : 0);
		}
		else {
			suggestedViewHeight = Math.round(content.width() / Math.max(options.aspectRatio, .5));
		}
	}
	
	
	function windowResize(ev) {
		if (
			!ignoreWindowResize &&
			ev.target === window && // so we don't process jqui "resize" events that have bubbled up
			currentView.start // view has already been rendered
		) {
			if (updateSize(true)) {
				currentView.trigger('windowResize', _element);
			}
		}
	}
	
	
	
	/* Event Fetching/Rendering
	-----------------------------------------------------------------------------*/
	// TODO: going forward, most of this stuff should be directly handled by the view


	function refetchEvents() { // can be called as an API method
		destroyEvents(); // so that events are cleared before user starts waiting for AJAX
		fetchAndRenderEvents();
	}


	function renderEvents() { // destroys old events if previously rendered
		if (elementVisible()) {
			freezeContentHeight();
			currentView.destroyEvents(); // no performance cost if never rendered
			currentView.renderEvents(events);
			unfreezeContentHeight();
		}
	}


	function destroyEvents() {
		freezeContentHeight();
		currentView.destroyEvents();
		unfreezeContentHeight();
	}
	

	function getAndRenderEvents() {
		if (!options.lazyFetching || isFetchNeeded(currentView.start, currentView.end)) {
			fetchAndRenderEvents();
		}
		else {
			renderEvents();
		}
	}


	function fetchAndRenderEvents() {
		fetchEvents(currentView.start, currentView.end);
			// ... will call reportEvents
			// ... which will call renderEvents
	}

	
	// called when event data arrives
	function reportEvents(_events) {
		events = _events;
		renderEvents();
	}


	// called when a single event's data has been changed
	function reportEventChange() {
		renderEvents();
	}



	/* Header Updating
	-----------------------------------------------------------------------------*/


	function updateTitle() {
		header.updateTitle(currentView.title);
	}


	function updateTodayButton() {
		var now = t.getNow();
		if (now.isWithin(currentView.intervalStart, currentView.intervalEnd)) {
			header.disableButton('today');
		}
		else {
			header.enableButton('today');
		}
	}
	


	/* Selection
	-----------------------------------------------------------------------------*/
	

	function select(start, end) {

		start = t.moment(start);
		if (end) {
			end = t.moment(end);
		}
		else if (start.hasTime()) {
			end = start.clone().add(t.defaultTimedEventDuration);
		}
		else {
			end = start.clone().add(t.defaultAllDayEventDuration);
		}

		currentView.select(start, end);
	}
	

	function unselect() { // safe to be called before renderView
		if (currentView) {
			currentView.unselect();
		}
	}
	
	
	
	/* Date
	-----------------------------------------------------------------------------*/
	
	
	function prev() {
		renderView(-1);
	}
	
	
	function next() {
		renderView(1);
	}
	
	
	function prevYear() {
		date.add(-1, 'years');
		renderView();
	}
	
	
	function nextYear() {
		date.add(1, 'years');
		renderView();
	}
	
	
	function today() {
		date = t.getNow();
		renderView();
	}
	
	
	function gotoDate(dateInput) {
		date = t.moment(dateInput);
		renderView();
	}
	
	
	function incrementDate(delta) {
		date.add(moment.duration(delta));
		renderView();
	}


	// Forces navigation to a view for the given date.
	// `viewName` can be a specific view name or a generic one like "week" or "day".
	function zoomTo(newDate, viewName) {
		var viewStr;
		var match;

		if (!viewName || fcViews[viewName] === undefined) { // a general view name, or "auto"
			viewName = viewName || 'day';
			viewStr = header.getViewsWithButtons().join(' '); // space-separated string of all the views in the header

			// try to match a general view name, like "week", against a specific one, like "agendaWeek"
			match = viewStr.match(new RegExp('\\w+' + capitaliseFirstLetter(viewName)));

			// fall back to the day view being used in the header
			if (!match) {
				match = viewStr.match(/\w+Day/);
			}

			viewName = match ? match[0] : 'agendaDay'; // fall back to agendaDay
		}

		date = newDate;
		changeView(viewName);
	}
	
	
	function getDate() {
		return date.clone();
	}



	/* Height "Freezing"
	-----------------------------------------------------------------------------*/


	function freezeContentHeight() {
		content.css({
			width: '100%',
			height: content.height(),
			overflow: 'hidden'
		});
	}


	function unfreezeContentHeight() {
		content.css({
			width: '',
			height: '',
			overflow: ''
		});
	}
	
	
	
	/* Misc
	-----------------------------------------------------------------------------*/
	

	function getCalendar() {
		return t;
	}

	
	function getView() {
		return currentView;
	}
	
	
	function option(name, value) {
		if (value === undefined) {
			return options[name];
		}
		if (name == 'height' || name == 'contentHeight' || name == 'aspectRatio') {
			options[name] = value;
			updateSize(true); // true = allow recalculation of height
		}
	}
	
	
	function trigger(name, thisObj) {
		if (options[name]) {
			return options[name].apply(
				thisObj || _element,
				Array.prototype.slice.call(arguments, 2)
			);
		}
	}

}

;;

/* Top toolbar area with buttons and title
----------------------------------------------------------------------------------------------------------------------*/
// TODO: rename all header-related things to "toolbar"

function Header(calendar, options) {
	var t = this;
	
	// exports
	t.render = render;
	t.destroy = destroy;
	t.updateTitle = updateTitle;
	t.activateButton = activateButton;
	t.deactivateButton = deactivateButton;
	t.disableButton = disableButton;
	t.enableButton = enableButton;
	t.getViewsWithButtons = getViewsWithButtons;
	
	// locals
	var el = $();
	var viewsWithButtons = [];
	var tm;


	function render() {
		var sections = options.header;

		tm = options.theme ? 'ui' : 'fc';

		if (sections) {
			el = $("<div class='fc-toolbar'/>")
				.append(renderSection('left'))
				.append(renderSection('right'))
				.append(renderSection('center'))
				.append('<div class="fc-clear"/>');

			return el;
		}
	}
	
	
	function destroy() {
		el.remove();
	}
	
	
	function renderSection(position) {
		var sectionEl = $('<div class="fc-' + position + '"/>');
		var buttonStr = options.header[position];

		if (buttonStr) {
			$.each(buttonStr.split(' '), function(i) {
				var groupChildren = $();
				var isOnlyButtons = true;
				var groupEl;

				$.each(this.split(','), function(j, buttonName) {
					var buttonClick;
					var themeIcon;
					var normalIcon;
					var defaultText;
					var customText;
					var innerHtml;
					var classes;
					var button;

					if (buttonName == 'title') {
						groupChildren = groupChildren.add($('<h2>&nbsp;</h2>')); // we always want it to take up height
						isOnlyButtons = false;
					}
					else {
						if (calendar[buttonName]) { // a calendar method
							buttonClick = function() {
								calendar[buttonName]();
							};
						}
						else if (fcViews[buttonName]) { // a view name
							buttonClick = function() {
								calendar.changeView(buttonName);
							};
							viewsWithButtons.push(buttonName);
						}
						if (buttonClick) {

							// smartProperty allows different text per view button (ex: "Agenda Week" vs "Basic Week")
							themeIcon = smartProperty(options.themeButtonIcons, buttonName);
							normalIcon = smartProperty(options.buttonIcons, buttonName);
							defaultText = smartProperty(options.defaultButtonText, buttonName);
							customText = smartProperty(options.buttonText, buttonName);

							if (customText) {
								innerHtml = htmlEscape(customText);
							}
							else if (themeIcon && options.theme) {
								innerHtml = "<span class='ui-icon ui-icon-" + themeIcon + "'></span>";
							}
							else if (normalIcon && !options.theme) {
								innerHtml = "<span class='fc-icon fc-icon-" + normalIcon + "'></span>";
							}
							else {
								innerHtml = htmlEscape(defaultText || buttonName);
							}

							classes = [
								'fc-' + buttonName + '-button',
								tm + '-button',
								tm + '-state-default'
							];

							button = $( // type="button" so that it doesn't submit a form
								'<button type="button" class="' + classes.join(' ') + '">' +
									innerHtml +
								'</button>'
								)
								.click(function() {
									// don't process clicks for disabled buttons
									if (!button.hasClass(tm + '-state-disabled')) {

										buttonClick();

										// after the click action, if the button becomes the "active" tab, or disabled,
										// it should never have a hover class, so remove it now.
										if (
											button.hasClass(tm + '-state-active') ||
											button.hasClass(tm + '-state-disabled')
										) {
											button.removeClass(tm + '-state-hover');
										}
									}
								})
								.mousedown(function() {
									// the *down* effect (mouse pressed in).
									// only on buttons that are not the "active" tab, or disabled
									button
										.not('.' + tm + '-state-active')
										.not('.' + tm + '-state-disabled')
										.addClass(tm + '-state-down');
								})
								.mouseup(function() {
									// undo the *down* effect
									button.removeClass(tm + '-state-down');
								})
								.hover(
									function() {
										// the *hover* effect.
										// only on buttons that are not the "active" tab, or disabled
										button
											.not('.' + tm + '-state-active')
											.not('.' + tm + '-state-disabled')
											.addClass(tm + '-state-hover');
									},
									function() {
										// undo the *hover* effect
										button
											.removeClass(tm + '-state-hover')
											.removeClass(tm + '-state-down'); // if mouseleave happens before mouseup
									}
								);

							groupChildren = groupChildren.add(button);
						}
					}
				});

				if (isOnlyButtons) {
					groupChildren
						.first().addClass(tm + '-corner-left').end()
						.last().addClass(tm + '-corner-right').end();
				}

				if (groupChildren.length > 1) {
					groupEl = $('<div/>');
					if (isOnlyButtons) {
						groupEl.addClass('fc-button-group');
					}
					groupEl.append(groupChildren);
					sectionEl.append(groupEl);
				}
				else {
					sectionEl.append(groupChildren); // 1 or 0 children
				}
			});
		}

		return sectionEl;
	}
	
	
	function updateTitle(text) {
		el.find('h2').text(text);
	}
	
	
	function activateButton(buttonName) {
		el.find('.fc-' + buttonName + '-button')
			.addClass(tm + '-state-active');
	}
	
	
	function deactivateButton(buttonName) {
		el.find('.fc-' + buttonName + '-button')
			.removeClass(tm + '-state-active');
	}
	
	
	function disableButton(buttonName) {
		el.find('.fc-' + buttonName + '-button')
			.attr('disabled', 'disabled')
			.addClass(tm + '-state-disabled');
	}
	
	
	function enableButton(buttonName) {
		el.find('.fc-' + buttonName + '-button')
			.removeAttr('disabled')
			.removeClass(tm + '-state-disabled');
	}


	function getViewsWithButtons() {
		return viewsWithButtons;
	}

}

;;

fc.sourceNormalizers = [];
fc.sourceFetchers = [];

var ajaxDefaults = {
	dataType: 'json',
	cache: false
};

var eventGUID = 1;


function EventManager(options) { // assumed to be a calendar
	var t = this;
	
	
	// exports
	t.isFetchNeeded = isFetchNeeded;
	t.fetchEvents = fetchEvents;
	t.addEventSource = addEventSource;
	t.removeEventSource = removeEventSource;
	t.updateEvent = updateEvent;
	t.renderEvent = renderEvent;
	t.removeEvents = removeEvents;
	t.clientEvents = clientEvents;
	t.mutateEvent = mutateEvent;
	
	
	// imports
	var trigger = t.trigger;
	var getView = t.getView;
	var reportEvents = t.reportEvents;
	var getEventEnd = t.getEventEnd;
	
	
	// locals
	var stickySource = { events: [] };
	var sources = [ stickySource ];
	var rangeStart, rangeEnd;
	var currentFetchID = 0;
	var pendingSourceCnt = 0;
	var loadingLevel = 0;
	var cache = []; // holds events that have already been expanded


	$.each(
		(options.events ? [ options.events ] : []).concat(options.eventSources || []),
		function(i, sourceInput) {
			var source = buildEventSource(sourceInput);
			if (source) {
				sources.push(source);
			}
		}
	);
	
	
	
	/* Fetching
	-----------------------------------------------------------------------------*/
	
	
	function isFetchNeeded(start, end) {
		return !rangeStart || // nothing has been fetched yet?
			// or, a part of the new range is outside of the old range? (after normalizing)
			start.clone().stripZone() < rangeStart.clone().stripZone() ||
			end.clone().stripZone() > rangeEnd.clone().stripZone();
	}
	
	
	function fetchEvents(start, end) {
		rangeStart = start;
		rangeEnd = end;
		cache = [];
		var fetchID = ++currentFetchID;
		var len = sources.length;
		pendingSourceCnt = len;
		for (var i=0; i<len; i++) {
			fetchEventSource(sources[i], fetchID);
		}
	}
	
	
	function fetchEventSource(source, fetchID) {
		_fetchEventSource(source, function(eventInputs) {
			var isArraySource = $.isArray(source.events);
			var i, eventInput;
			var abstractEvent;

			if (fetchID == currentFetchID) {

				if (eventInputs) {
					for (i = 0; i < eventInputs.length; i++) {
						eventInput = eventInputs[i];

						if (isArraySource) { // array sources have already been convert to Event Objects
							abstractEvent = eventInput;
						}
						else {
							abstractEvent = buildEventFromInput(eventInput, source);
						}

						if (abstractEvent) { // not false (an invalid event)
							cache.push.apply(
								cache,
								expandEvent(abstractEvent) // add individual expanded events to the cache
							);
						}
					}
				}

				pendingSourceCnt--;
				if (!pendingSourceCnt) {
					reportEvents(cache);
				}
			}
		});
	}
	
	
	function _fetchEventSource(source, callback) {
		var i;
		var fetchers = fc.sourceFetchers;
		var res;

		for (i=0; i<fetchers.length; i++) {
			res = fetchers[i].call(
				t, // this, the Calendar object
				source,
				rangeStart.clone(),
				rangeEnd.clone(),
				options.timezone,
				callback
			);

			if (res === true) {
				// the fetcher is in charge. made its own async request
				return;
			}
			else if (typeof res == 'object') {
				// the fetcher returned a new source. process it
				_fetchEventSource(res, callback);
				return;
			}
		}

		var events = source.events;
		if (events) {
			if ($.isFunction(events)) {
				pushLoading();
				events.call(
					t, // this, the Calendar object
					rangeStart.clone(),
					rangeEnd.clone(),
					options.timezone,
					function(events) {
						callback(events);
						popLoading();
					}
				);
			}
			else if ($.isArray(events)) {
				callback(events);
			}
			else {
				callback();
			}
		}else{
			var url = source.url;
			if (url) {
				var success = source.success;
				var error = source.error;
				var complete = source.complete;

				// retrieve any outbound GET/POST $.ajax data from the options
				var customData;
				if ($.isFunction(source.data)) {
					// supplied as a function that returns a key/value object
					customData = source.data();
				}
				else {
					// supplied as a straight key/value object
					customData = source.data;
				}

				// use a copy of the custom data so we can modify the parameters
				// and not affect the passed-in object.
				var data = $.extend({}, customData || {});

				var startParam = firstDefined(source.startParam, options.startParam);
				var endParam = firstDefined(source.endParam, options.endParam);
				var timezoneParam = firstDefined(source.timezoneParam, options.timezoneParam);

				if (startParam) {
					data[startParam] = rangeStart.format();
				}
				if (endParam) {
					data[endParam] = rangeEnd.format();
				}
				if (options.timezone && options.timezone != 'local') {
					data[timezoneParam] = options.timezone;
				}

				pushLoading();
				$.ajax($.extend({}, ajaxDefaults, source, {
					data: data,
					success: function(events) {
						events = events || [];
						var res = applyAll(success, this, arguments);
						if ($.isArray(res)) {
							events = res;
						}
						callback(events);
					},
					error: function() {
						applyAll(error, this, arguments);
						callback();
					},
					complete: function() {
						applyAll(complete, this, arguments);
						popLoading();
					}
				}));
			}else{
				callback();
			}
		}
	}
	
	
	
	/* Sources
	-----------------------------------------------------------------------------*/
	

	function addEventSource(sourceInput) {
		var source = buildEventSource(sourceInput);
		if (source) {
			sources.push(source);
			pendingSourceCnt++;
			fetchEventSource(source, currentFetchID); // will eventually call reportEvents
		}
	}


	function buildEventSource(sourceInput) { // will return undefined if invalid source
		var normalizers = fc.sourceNormalizers;
		var source;
		var i;

		if ($.isFunction(sourceInput) || $.isArray(sourceInput)) {
			source = { events: sourceInput };
		}
		else if (typeof sourceInput === 'string') {
			source = { url: sourceInput };
		}
		else if (typeof sourceInput === 'object') {
			source = $.extend({}, sourceInput); // shallow copy
		}

		if (source) {

			// TODO: repeat code, same code for event classNames
			if (source.className) {
				if (typeof source.className === 'string') {
					source.className = source.className.split(/\s+/);
				}
				// otherwise, assumed to be an array
			}
			else {
				source.className = [];
			}

			// for array sources, we convert to standard Event Objects up front
			if ($.isArray(source.events)) {
				source.origArray = source.events; // for removeEventSource
				source.events = $.map(source.events, function(eventInput) {
					return buildEventFromInput(eventInput, source);
				});
			}

			for (i=0; i<normalizers.length; i++) {
				normalizers[i].call(t, source);
			}

			return source;
		}
	}


	function removeEventSource(source) {
		sources = $.grep(sources, function(src) {
			return !isSourcesEqual(src, source);
		});
		// remove all client events from that source
		cache = $.grep(cache, function(e) {
			return !isSourcesEqual(e.source, source);
		});
		reportEvents(cache);
	}


	function isSourcesEqual(source1, source2) {
		return source1 && source2 && getSourcePrimitive(source1) == getSourcePrimitive(source2);
	}


	function getSourcePrimitive(source) {
		return (
			(typeof source === 'object') ? // a normalized event source?
				(source.origArray || source.googleCalendarId || source.url || source.events) : // get the primitive
				null
		) ||
		source; // the given argument *is* the primitive
	}
	
	
	
	/* Manipulation
	-----------------------------------------------------------------------------*/


	function updateEvent(event) {

		event.start = t.moment(event.start);
		if (event.end) {
			event.end = t.moment(event.end);
		}

		mutateEvent(event);
		propagateMiscProperties(event);
		reportEvents(cache); // reports event modifications (so we can redraw)
	}


	var miscCopyableProps = [
		'title',
		'url',
		'allDay',
		'className',
		'editable',
		'color',
		'backgroundColor',
		'borderColor',
		'textColor'
	];

	function propagateMiscProperties(event) {
		var i;
		var cachedEvent;
		var j;
		var prop;

		for (i=0; i<cache.length; i++) {
			cachedEvent = cache[i];
			if (cachedEvent._id == event._id && cachedEvent !== event) {
				for (j=0; j<miscCopyableProps.length; j++) {
					prop = miscCopyableProps[j];
					if (event[prop] !== undefined) {
						cachedEvent[prop] = event[prop];
					}
				}
			}
		}
	}

	
	// returns the expanded events that were created
	function renderEvent(eventInput, stick) {
		var abstractEvent = buildEventFromInput(eventInput);
		var events;
		var i, event;

		if (abstractEvent) { // not false (a valid input)
			events = expandEvent(abstractEvent);

			for (i = 0; i < events.length; i++) {
				event = events[i];

				if (!event.source) {
					if (stick) {
						stickySource.events.push(event);
						event.source = stickySource;
					}
					cache.push(event);
				}
			}

			reportEvents(cache);

			return events;
		}

		return [];
	}
	
	
	function removeEvents(filter) {
		var eventID;
		var i;

		if (filter == null) { // null or undefined. remove all events
			filter = function() { return true; }; // will always match
		}
		else if (!$.isFunction(filter)) { // an event ID
			eventID = filter + '';
			filter = function(event) {
				return event._id == eventID;
			};
		}

		// Purge event(s) from our local cache
		cache = $.grep(cache, filter, true); // inverse=true

		// Remove events from array sources.
		// This works because they have been converted to official Event Objects up front.
		// (and as a result, event._id has been calculated).
		for (i=0; i<sources.length; i++) {
			if ($.isArray(sources[i].events)) {
				sources[i].events = $.grep(sources[i].events, filter, true);
			}
		}

		reportEvents(cache);
	}
	
	
	function clientEvents(filter) {
		if ($.isFunction(filter)) {
			return $.grep(cache, filter);
		}
		else if (filter != null) { // not null, not undefined. an event ID
			filter += '';
			return $.grep(cache, function(e) {
				return e._id == filter;
			});
		}
		return cache; // else, return all
	}
	
	
	
	/* Loading State
	-----------------------------------------------------------------------------*/
	
	
	function pushLoading() {
		if (!(loadingLevel++)) {
			trigger('loading', null, true, getView());
		}
	}
	
	
	function popLoading() {
		if (!(--loadingLevel)) {
			trigger('loading', null, false, getView());
		}
	}
	
	
	
	/* Event Normalization
	-----------------------------------------------------------------------------*/


	// Given a raw object with key/value properties, returns an "abstract" Event object.
	// An "abstract" event is an event that, if recurring, will not have been expanded yet.
	// Will return `false` when input is invalid.
	// `source` is optional
	function buildEventFromInput(input, source) {
		var out = {};
		var start, end;
		var allDay;
		var allDayDefault;

		if (options.eventDataTransform) {
			input = options.eventDataTransform(input);
		}
		if (source && source.eventDataTransform) {
			input = source.eventDataTransform(input);
		}

		// Copy all properties over to the resulting object.
		// The special-case properties will be copied over afterwards.
		$.extend(out, input);

		if (source) {
			out.source = source;
		}

		out._id = input._id || (input.id === undefined ? '_fc' + eventGUID++ : input.id + '');

		if (input.className) {
			if (typeof input.className == 'string') {
				out.className = input.className.split(/\s+/);
			}
			else { // assumed to be an array
				out.className = input.className;
			}
		}
		else {
			out.className = [];
		}

		start = input.start || input.date; // "date" is an alias for "start"
		end = input.end;

		// parse as a time (Duration) if applicable
		if (isTimeString(start)) {
			start = moment.duration(start);
		}
		if (isTimeString(end)) {
			end = moment.duration(end);
		}

		if (input.dow || moment.isDuration(start) || moment.isDuration(end)) {

			// the event is "abstract" (recurring) so don't calculate exact start/end dates just yet
			out.start = start ? moment.duration(start) : null; // will be a Duration or null
			out.end = end ? moment.duration(end) : null; // will be a Duration or null
			out._recurring = true; // our internal marker
		}
		else {

			if (start) {
				start = t.moment(start);
				if (!start.isValid()) {
					return false;
				}
			}

			if (end) {
				end = t.moment(end);
				if (!end.isValid()) {
					end = null; // let defaults take over
				}
			}

			allDay = input.allDay;
			if (allDay === undefined) {
				allDayDefault = firstDefined(
					source ? source.allDayDefault : undefined,
					options.allDayDefault
				);
				if (allDayDefault !== undefined) {
					// use the default
					allDay = allDayDefault;
				}
				else {
					// if a single date has a time, the event should not be all-day
					allDay = !start.hasTime() && (!end || !end.hasTime());
				}
			}

			assignDatesToEvent(start, end, allDay, out);
		}

		return out;
	}


	// Normalizes and assigns the given dates to the given partially-formed event object.
	// Requires an explicit `allDay` boolean parameter.
	// NOTE: mutates the given start/end moments. does not make an internal copy
	function assignDatesToEvent(start, end, allDay, event) {

		// normalize the date based on allDay
		if (allDay) {
			// neither date should have a time
			if (start.hasTime()) {
				start.stripTime();
			}
			if (end && end.hasTime()) {
				end.stripTime();
			}
		}
		else {
			// force a time/zone up the dates
			if (!start.hasTime()) {
				start = t.rezoneDate(start);
			}
			if (end && !end.hasTime()) {
				end = t.rezoneDate(end);
			}
		}

		if (end && end <= start) { // end is exclusive. must be after start
			end = null; // let defaults take over
		}

		event.allDay = allDay;
		event.start = start;
		event.end = end || null; // ensure null if falsy

		if (options.forceEventDuration && !event.end) {
			event.end = getEventEnd(event);
		}

		backupEventDates(event);
	}


	// If the given event is a recurring event, break it down into an array of individual instances.
	// If not a recurring event, return an array with the single original event.
	// If given a falsy input (probably because of a failed buildEventFromInput call), returns an empty array.
	// HACK: can override the recurring window by providing custom rangeStart/rangeEnd (for businessHours).
	function expandEvent(abstractEvent, _rangeStart, _rangeEnd) {
		var events = [];
		var dowHash;
		var dow;
		var i;
		var date;
		var startTime, endTime;
		var start, end;
		var event;

		_rangeStart = _rangeStart || rangeStart;
		_rangeEnd = _rangeEnd || rangeEnd;

		if (abstractEvent) {
			if (abstractEvent._recurring) {

				// make a boolean hash as to whether the event occurs on each day-of-week
				if ((dow = abstractEvent.dow)) {
					dowHash = {};
					for (i = 0; i < dow.length; i++) {
						dowHash[dow[i]] = true;
					}
				}

				// iterate through every day in the current range
				date = _rangeStart.clone().stripTime(); // holds the date of the current day
				while (date.isBefore(_rangeEnd)) {

					if (!dowHash || dowHash[date.day()]) { // if everyday, or this particular day-of-week

						startTime = abstractEvent.start; // the stored start and end properties are times (Durations)
						endTime = abstractEvent.end; // "
						start = date.clone();
						end = null;

						if (startTime) {
							start = start.time(startTime);
						}
						if (endTime) {
							end = date.clone().time(endTime);
						}

						event = $.extend({}, abstractEvent); // make a copy of the original
						assignDatesToEvent(
							start, end,
							!startTime && !endTime, // allDay?
							event
						);
						events.push(event);
					}

					date.add(1, 'days');
				}
			}
			else {
				events.push(abstractEvent); // return the original event. will be a one-item array
			}
		}

		return events;
	}



	/* Event Modification Math
	-----------------------------------------------------------------------------------------*/


	// Modify the date(s) of an event and make this change propagate to all other events with
	// the same ID (related repeating events).
	//
	// If `newStart`/`newEnd` are not specified, the "new" dates are assumed to be `event.start` and `event.end`.
	// The "old" dates to be compare against are always `event._start` and `event._end` (set by EventManager).
	//
	// Returns an object with delta information and a function to undo all operations.
	//
	function mutateEvent(event, newStart, newEnd) {
		var oldAllDay = event._allDay;
		var oldStart = event._start;
		var oldEnd = event._end;
		var clearEnd = false;
		var newAllDay;
		var dateDelta;
		var durationDelta;
		var undoFunc;

		// if no new dates were passed in, compare against the event's existing dates
		if (!newStart && !newEnd) {
			newStart = event.start;
			newEnd = event.end;
		}

		// NOTE: throughout this function, the initial values of `newStart` and `newEnd` are
		// preserved. These values may be undefined.

		// detect new allDay
		if (event.allDay != oldAllDay) { // if value has changed, use it
			newAllDay = event.allDay;
		}
		else { // otherwise, see if any of the new dates are allDay
			newAllDay = !(newStart || newEnd).hasTime();
		}

		// normalize the new dates based on allDay
		if (newAllDay) {
			if (newStart) {
				newStart = newStart.clone().stripTime();
			}
			if (newEnd) {
				newEnd = newEnd.clone().stripTime();
			}
		}

		// compute dateDelta
		if (newStart) {
			if (newAllDay) {
				dateDelta = dayishDiff(newStart, oldStart.clone().stripTime()); // treat oldStart as allDay
			}
			else {
				dateDelta = dayishDiff(newStart, oldStart);
			}
		}

		if (newAllDay != oldAllDay) {
			// if allDay has changed, always throw away the end
			clearEnd = true;
		}
		else if (newEnd) {
			durationDelta = dayishDiff(
				// new duration
				newEnd || t.getDefaultEventEnd(newAllDay, newStart || oldStart),
				newStart || oldStart
			).subtract(dayishDiff(
				// subtract old duration
				oldEnd || t.getDefaultEventEnd(oldAllDay, oldStart),
				oldStart
			));
		}

		undoFunc = mutateEvents(
			clientEvents(event._id), // get events with this ID
			clearEnd,
			newAllDay,
			dateDelta,
			durationDelta
		);

		return {
			dateDelta: dateDelta,
			durationDelta: durationDelta,
			undo: undoFunc
		};
	}


	// Modifies an array of events in the following ways (operations are in order):
	// - clear the event's `end`
	// - convert the event to allDay
	// - add `dateDelta` to the start and end
	// - add `durationDelta` to the event's duration
	//
	// Returns a function that can be called to undo all the operations.
	//
	function mutateEvents(events, clearEnd, forceAllDay, dateDelta, durationDelta) {
		var isAmbigTimezone = t.getIsAmbigTimezone();
		var undoFunctions = [];

		$.each(events, function(i, event) {
			var oldAllDay = event._allDay;
			var oldStart = event._start;
			var oldEnd = event._end;
			var newAllDay = forceAllDay != null ? forceAllDay : oldAllDay;
			var newStart = oldStart.clone();
			var newEnd = (!clearEnd && oldEnd) ? oldEnd.clone() : null;

			// NOTE: this function is responsible for transforming `newStart` and `newEnd`,
			// which were initialized to the OLD values first. `newEnd` may be null.

			// normlize newStart/newEnd to be consistent with newAllDay
			if (newAllDay) {
				newStart.stripTime();
				if (newEnd) {
					newEnd.stripTime();
				}
			}
			else {
				if (!newStart.hasTime()) {
					newStart = t.rezoneDate(newStart);
				}
				if (newEnd && !newEnd.hasTime()) {
					newEnd = t.rezoneDate(newEnd);
				}
			}

			// ensure we have an end date if necessary
			if (!newEnd && (options.forceEventDuration || +durationDelta)) {
				newEnd = t.getDefaultEventEnd(newAllDay, newStart);
			}

			// translate the dates
			newStart.add(dateDelta);
			if (newEnd) {
				newEnd.add(dateDelta).add(durationDelta);
			}

			// if the dates have changed, and we know it is impossible to recompute the
			// timezone offsets, strip the zone.
			if (isAmbigTimezone) {
				if (+dateDelta || +durationDelta) {
					newStart.stripZone();
					if (newEnd) {
						newEnd.stripZone();
					}
				}
			}

			event.allDay = newAllDay;
			event.start = newStart;
			event.end = newEnd;
			backupEventDates(event);

			undoFunctions.push(function() {
				event.allDay = oldAllDay;
				event.start = oldStart;
				event.end = oldEnd;
				backupEventDates(event);
			});
		});

		return function() {
			for (var i=0; i<undoFunctions.length; i++) {
				undoFunctions[i]();
			}
		};
	}


	/* Business Hours
	-----------------------------------------------------------------------------------------*/

	t.getBusinessHoursEvents = getBusinessHoursEvents;


	// Returns an array of events as to when the business hours occur in the given view.
	// Abuse of our event system :(
	function getBusinessHoursEvents() {
		var optionVal = options.businessHours;
		var defaultVal = {
			className: 'fc-nonbusiness',
			start: '09:00',
			end: '17:00',
			dow: [ 1, 2, 3, 4, 5 ], // monday - friday
			rendering: 'inverse-background'
		};
		var view = t.getView();
		var eventInput;

		if (optionVal) {
			if (typeof optionVal === 'object') {
				// option value is an object that can override the default business hours
				eventInput = $.extend({}, defaultVal, optionVal);
			}
			else {
				// option value is `true`. use default business hours
				eventInput = defaultVal;
			}
		}

		if (eventInput) {
			return expandEvent(
				buildEventFromInput(eventInput),
				view.start,
				view.end
			);
		}

		return [];
	}


	/* Overlapping / Constraining
	-----------------------------------------------------------------------------------------*/

	t.isEventAllowedInRange = isEventAllowedInRange;
	t.isSelectionAllowedInRange = isSelectionAllowedInRange;
	t.isExternalDragAllowedInRange = isExternalDragAllowedInRange;


	function isEventAllowedInRange(event, start, end) {
		var source = event.source || {};
		var constraint = firstDefined(
			event.constraint,
			source.constraint,
			options.eventConstraint
		);
		var overlap = firstDefined(
			event.overlap,
			source.overlap,
			options.eventOverlap
		);

		return isRangeAllowed(start, end, constraint, overlap, event);
	}


	function isSelectionAllowedInRange(start, end) {
		return isRangeAllowed(
			start,
			end,
			options.selectConstraint,
			options.selectOverlap
		);
	}


	function isExternalDragAllowedInRange(start, end, eventInput) { // eventInput is optional associated event data
		var event;

		if (eventInput) {
			event = expandEvent(buildEventFromInput(eventInput))[0];
			if (event) {
				return isEventAllowedInRange(event, start, end);
			}
		}

		return isSelectionAllowedInRange(start, end); // treat it as a selection
	}


	// Returns true if the given range (caused by an event drop/resize or a selection) is allowed to exist
	// according to the constraint/overlap settings.
	// `event` is not required if checking a selection.
	function isRangeAllowed(start, end, constraint, overlap, event) {
		var constraintEvents;
		var anyContainment;
		var i, otherEvent;
		var otherOverlap;

		// normalize. fyi, we're normalizing in too many places :(
		start = start.clone().stripZone();
		end = end.clone().stripZone();

		// the range must be fully contained by at least one of produced constraint events
		if (constraint != null) {
			constraintEvents = constraintToEvents(constraint);
			anyContainment = false;

			for (i = 0; i < constraintEvents.length; i++) {
				if (eventContainsRange(constraintEvents[i], start, end)) {
					anyContainment = true;
					break;
				}
			}

			if (!anyContainment) {
				return false;
			}
		}

		for (i = 0; i < cache.length; i++) { // loop all events and detect overlap
			otherEvent = cache[i];

			// don't compare the event to itself or other related [repeating] events
			if (event && event._id === otherEvent._id) {
				continue;
			}

			// there needs to be an actual intersection before disallowing anything
			if (eventIntersectsRange(otherEvent, start, end)) {

				// evaluate overlap for the given range and short-circuit if necessary
				if (overlap === false) {
					return false;
				}
				else if (typeof overlap === 'function' && !overlap(otherEvent, event)) {
					return false;
				}

				// if we are computing if the given range is allowable for an event, consider the other event's
				// EventObject-specific or Source-specific `overlap` property
				if (event) {
					otherOverlap = firstDefined(
						otherEvent.overlap,
						(otherEvent.source || {}).overlap
						// we already considered the global `eventOverlap`
					);
					if (otherOverlap === false) {
						return false;
					}
					if (typeof otherOverlap === 'function' && !otherOverlap(event, otherEvent)) {
						return false;
					}
				}
			}
		}

		return true;
	}


	// Given an event input from the API, produces an array of event objects. Possible event inputs:
	// 'businessHours'
	// An event ID (number or string)
	// An object with specific start/end dates or a recurring event (like what businessHours accepts)
	function constraintToEvents(constraintInput) {

		if (constraintInput === 'businessHours') {
			return getBusinessHoursEvents();
		}

		if (typeof constraintInput === 'object') {
			return expandEvent(buildEventFromInput(constraintInput));
		}

		return clientEvents(constraintInput); // probably an ID
	}


	// Is the event's date ranged fully contained by the given range?
	// start/end already assumed to have stripped zones :(
	function eventContainsRange(event, start, end) {
		var eventStart = event.start.clone().stripZone();
		var eventEnd = t.getEventEnd(event).stripZone();

		return start >= eventStart && end <= eventEnd;
	}


	// Does the event's date range intersect with the given range?
	// start/end already assumed to have stripped zones :(
	function eventIntersectsRange(event, start, end) {
		var eventStart = event.start.clone().stripZone();
		var eventEnd = t.getEventEnd(event).stripZone();

		return start < eventEnd && end > eventStart;
	}

}


// updates the "backup" properties, which are preserved in order to compute diffs later on.
function backupEventDates(event) {
	event._allDay = event.allDay;
	event._start = event.start.clone();
	event._end = event.end ? event.end.clone() : null;
}

;;

/* FullCalendar-specific DOM Utilities
----------------------------------------------------------------------------------------------------------------------*/


// Given the scrollbar widths of some other container, create borders/margins on rowEls in order to match the left
// and right space that was offset by the scrollbars. A 1-pixel border first, then margin beyond that.
function compensateScroll(rowEls, scrollbarWidths) {
	if (scrollbarWidths.left) {
		rowEls.css({
			'border-left-width': 1,
			'margin-left': scrollbarWidths.left - 1
		});
	}
	if (scrollbarWidths.right) {
		rowEls.css({
			'border-right-width': 1,
			'margin-right': scrollbarWidths.right - 1
		});
	}
}


// Undoes compensateScroll and restores all borders/margins
function uncompensateScroll(rowEls) {
	rowEls.css({
		'margin-left': '',
		'margin-right': '',
		'border-left-width': '',
		'border-right-width': ''
	});
}


// Make the mouse cursor express that an event is not allowed in the current area
function disableCursor() {
	$('body').addClass('fc-not-allowed');
}


// Returns the mouse cursor to its original look
function enableCursor() {
	$('body').removeClass('fc-not-allowed');
}


// Given a total available height to fill, have `els` (essentially child rows) expand to accomodate.
// By default, all elements that are shorter than the recommended height are expanded uniformly, not considering
// any other els that are already too tall. if `shouldRedistribute` is on, it considers these tall rows and 
// reduces the available height.
function distributeHeight(els, availableHeight, shouldRedistribute) {

	// *FLOORING NOTE*: we floor in certain places because zoom can give inaccurate floating-point dimensions,
	// and it is better to be shorter than taller, to avoid creating unnecessary scrollbars.

	var minOffset1 = Math.floor(availableHeight / els.length); // for non-last element
	var minOffset2 = Math.floor(availableHeight - minOffset1 * (els.length - 1)); // for last element *FLOORING NOTE*
	var flexEls = []; // elements that are allowed to expand. array of DOM nodes
	var flexOffsets = []; // amount of vertical space it takes up
	var flexHeights = []; // actual css height
	var usedHeight = 0;

	undistributeHeight(els); // give all elements their natural height

	// find elements that are below the recommended height (expandable).
	// important to query for heights in a single first pass (to avoid reflow oscillation).
	els.each(function(i, el) {
		var minOffset = i === els.length - 1 ? minOffset2 : minOffset1;
		var naturalOffset = $(el).outerHeight(true);

		if (naturalOffset < minOffset) {
			flexEls.push(el);
			flexOffsets.push(naturalOffset);
			flexHeights.push($(el).height());
		}
		else {
			// this element stretches past recommended height (non-expandable). mark the space as occupied.
			usedHeight += naturalOffset;
		}
	});

	// readjust the recommended height to only consider the height available to non-maxed-out rows.
	if (shouldRedistribute) {
		availableHeight -= usedHeight;
		minOffset1 = Math.floor(availableHeight / flexEls.length);
		minOffset2 = Math.floor(availableHeight - minOffset1 * (flexEls.length - 1)); // *FLOORING NOTE*
	}

	// assign heights to all expandable elements
	$(flexEls).each(function(i, el) {
		var minOffset = i === flexEls.length - 1 ? minOffset2 : minOffset1;
		var naturalOffset = flexOffsets[i];
		var naturalHeight = flexHeights[i];
		var newHeight = minOffset - (naturalOffset - naturalHeight); // subtract the margin/padding

		if (naturalOffset < minOffset) { // we check this again because redistribution might have changed things
			$(el).height(newHeight);
		}
	});
}


// Undoes distrubuteHeight, restoring all els to their natural height
function undistributeHeight(els) {
	els.height('');
}


// Given `els`, a jQuery set of <td> cells, find the cell with the largest natural width and set the widths of all the
// cells to be that width.
// PREREQUISITE: if you want a cell to take up width, it needs to have a single inner element w/ display:inline
function matchCellWidths(els) {
	var maxInnerWidth = 0;

	els.find('> *').each(function(i, innerEl) {
		var innerWidth = $(innerEl).outerWidth();
		if (innerWidth > maxInnerWidth) {
			maxInnerWidth = innerWidth;
		}
	});

	maxInnerWidth++; // sometimes not accurate of width the text needs to stay on one line. insurance

	els.width(maxInnerWidth);

	return maxInnerWidth;
}


// Turns a container element into a scroller if its contents is taller than the allotted height.
// Returns true if the element is now a scroller, false otherwise.
// NOTE: this method is best because it takes weird zooming dimensions into account
function setPotentialScroller(containerEl, height) {
	containerEl.height(height).addClass('fc-scroller');

	// are scrollbars needed?
	if (containerEl[0].scrollHeight - 1 > containerEl[0].clientHeight) { // !!! -1 because IE is often off-by-one :(
		return true;
	}

	unsetScroller(containerEl); // undo
	return false;
}


// Takes an element that might have been a scroller, and turns it back into a normal element.
function unsetScroller(containerEl) {
	containerEl.height('').removeClass('fc-scroller');
}


/* General DOM Utilities
----------------------------------------------------------------------------------------------------------------------*/


// 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;
}


// Given a container element, return an object with the pixel values of the left/right scrollbars.
// Left scrollbars might occur on RTL browsers (IE maybe?) but I have not tested.
// PREREQUISITE: container element must have a single child with display:block
function getScrollbarWidths(container) {
	var containerLeft = container.offset().left;
	var containerRight = containerLeft + container.width();
	var inner = container.children();
	var innerLeft = inner.offset().left;
	var innerRight = innerLeft + inner.outerWidth();

	return {
		left: innerLeft - containerLeft,
		right: containerRight - innerRight
	};
}


// 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;
}


/* FullCalendar-specific Misc Utilities
----------------------------------------------------------------------------------------------------------------------*/


// Creates a basic segment with the intersection of the two ranges. Returns undefined if no intersection.
// Expects all dates to be normalized to the same timezone beforehand.
function intersectionToSeg(subjectStart, subjectEnd, intervalStart, intervalEnd) {
	var segStart, segEnd;
	var isStart, isEnd;

	if (subjectEnd > intervalStart && subjectStart < intervalEnd) { // in bounds at all?

		if (subjectStart >= intervalStart) {
			segStart = subjectStart.clone();
			isStart = true;
		}
		else {
			segStart = intervalStart.clone();
			isStart =  false;
		}

		if (subjectEnd <= intervalEnd) {
			segEnd = subjectEnd.clone();
			isEnd = true;
		}
		else {
			segEnd = intervalEnd.clone();
			isEnd = false;
		}

		return {
			start: segStart,
			end: segEnd,
			isStart: isStart,
			isEnd: isEnd
		};
	}
}


function smartProperty(obj, name) { // get a camel-cased/namespaced property of an object
	obj = obj || {};
	if (obj[name] !== undefined) {
		return obj[name];
	}
	var parts = name.split(/(?=[A-Z])/),
		i = parts.length - 1, res;
	for (; i>=0; i--) {
		res = obj[parts[i].toLowerCase()];
		if (res !== undefined) {
			return res;
		}
	}
	return obj['default'];
}


/* Date Utilities
----------------------------------------------------------------------------------------------------------------------*/

var dayIDs = [ 'sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat' ];


// Diffs the two moments into a Duration where full-days are recorded first, then the remaining time.
// Moments will have their timezones normalized.
function dayishDiff(a, b) {
	return moment.duration({
		days: a.clone().stripTime().diff(b.clone().stripTime(), 'days'),
		ms: a.time() - b.time()
	});
}


function isNativeDate(input) {
	return  Object.prototype.toString.call(input) === '[object Date]' || input instanceof Date;
}


// Returns a boolean about whether the given input is a time string, like "06:40:00" or "06:00"
function isTimeString(str) {
	return /^\d+\:\d+(?:\:\d+\.?(?:\d{3})?)?$/.test(str);
}


/* General Utilities
----------------------------------------------------------------------------------------------------------------------*/

fc.applyAll = applyAll; // export


// Create an object that has the given prototype. Just like Object.create
function createObject(proto) {
	var f = function() {};
	f.prototype = proto;
	return new f();
}


function applyAll(functions, thisObj, args) {
	if ($.isFunction(functions)) {
		functions = [ functions ];
	}
	if (functions) {
		var i;
		var ret;
		for (i=0; i<functions.length; i++) {
			ret = functions[i].apply(thisObj, args) || ret;
		}
		return ret;
	}
}


function firstDefined() {
	for (var i=0; i<arguments.length; i++) {
		if (arguments[i] !== undefined) {
			return arguments[i];
		}
	}
}


function htmlEscape(s) {
	return (s + '').replace(/&/g, '&amp;')
		.replace(/</g, '&lt;')
		.replace(/>/g, '&gt;')
		.replace(/'/g, '&#039;')
		.replace(/"/g, '&quot;')
		.replace(/\n/g, '<br />');
}


function stripHtmlEntities(text) {
	return text.replace(/&.*?;/g, '');
}


function capitaliseFirstLetter(str) {
	return str.charAt(0).toUpperCase() + str.slice(1);
}


function compareNumbers(a, b) { // for .sort()
	return a - b;
}


// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds.
// https://github.com/jashkenas/underscore/blob/1.6.0/underscore.js#L714
function debounce(func, wait) {
	var timeoutId;
	var args;
	var context;
	var timestamp; // of most recent call
	var later = function() {
		var last = +new Date() - timestamp;
		if (last < wait && last > 0) {
			timeoutId = setTimeout(later, wait - last);
		}
		else {
			timeoutId = null;
			func.apply(context, args);
			if (!timeoutId) {
				context = args = null;
			}
		}
	};

	return function() {
		context = this;
		args = arguments;
		timestamp = +new Date();
		if (!timeoutId) {
			timeoutId = setTimeout(later, wait);
		}
	};
}

;;

var ambigDateOfMonthRegex = /^\s*\d{4}-\d\d$/;
var ambigTimeOrZoneRegex =
	/^\s*\d{4}-(?:(\d\d-\d\d)|(W\d\d$)|(W\d\d-\d)|(\d\d\d))((T| )(\d\d(:\d\d(:\d\d(\.\d+)?)?)?)?)?$/;
var newMomentProto = moment.fn; // where we will attach our new methods
var oldMomentProto = $.extend({}, newMomentProto); // copy of original moment methods
var allowValueOptimization;
var setUTCValues; // function defined below
var setLocalValues; // function defined below


// Creating
// -------------------------------------------------------------------------------------------------

// Creates a new moment, similar to the vanilla moment(...) constructor, but with
// extra features (ambiguous time, enhanced formatting). When given an existing moment,
// it will function as a clone (and retain the zone of the moment). Anything else will
// result in a moment in the local zone.
fc.moment = function() {
	return makeMoment(arguments);
};

// Sames as fc.moment, but forces the resulting moment to be in the UTC timezone.
fc.moment.utc = function() {
	var mom = makeMoment(arguments, true);

	// Force it into UTC because makeMoment doesn't guarantee it
	// (if given a pre-existing moment for example)
	if (mom.hasTime()) { // don't give ambiguously-timed moments a UTC zone
		mom.utc();
	}

	return mom;
};

// Same as fc.moment, but when given an ISO8601 string, the timezone offset is preserved.
// ISO8601 strings with no timezone offset will become ambiguously zoned.
fc.moment.parseZone = function() {
	return makeMoment(arguments, true, true);
};

// Builds an enhanced moment from args. When given an existing moment, it clones. When given a
// native Date, or called with no arguments (the current time), the resulting moment will be local.
// Anything else needs to be "parsed" (a string or an array), and will be affected by:
//    parseAsUTC - if there is no zone information, should we parse the input in UTC?
//    parseZone - if there is zone information, should we force the zone of the moment?
function makeMoment(args, parseAsUTC, parseZone) {
	var input = args[0];
	var isSingleString = args.length == 1 && typeof input === 'string';
	var isAmbigTime;
	var isAmbigZone;
	var ambigMatch;
	var mom;

	if (moment.isMoment(input)) {
		mom = moment.apply(null, args); // clone it
		transferAmbigs(input, mom); // the ambig flags weren't transfered with the clone
	}
	else if (isNativeDate(input) || input === undefined) {
		mom = moment.apply(null, args); // will be local
	}
	else { // "parsing" is required
		isAmbigTime = false;
		isAmbigZone = false;

		if (isSingleString) {
			if (ambigDateOfMonthRegex.test(input)) {
				// accept strings like '2014-05', but convert to the first of the month
				input += '-01';
				args = [ input ]; // for when we pass it on to moment's constructor
				isAmbigTime = true;
				isAmbigZone = true;
			}
			else if ((ambigMatch = ambigTimeOrZoneRegex.exec(input))) {
				isAmbigTime = !ambigMatch[5]; // no time part?
				isAmbigZone = true;
			}
		}
		else if ($.isArray(input)) {
			// arrays have no timezone information, so assume ambiguous zone
			isAmbigZone = true;
		}
		// otherwise, probably a string with a format

		if (parseAsUTC) {
			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.zone(input); // if not a valid zone, will assign UTC
			}
		}
	}

	mom._fullCalendar = true; // flag for extended functionality

	return mom;
}


// A clone method that works with the flags related to our enhanced functionality.
// In the future, use moment.momentProperties
newMomentProto.clone = function() {
	var mom = oldMomentProto.clone.apply(this, arguments);

	// these flags weren't transfered with the clone
	transferAmbigs(this, mom);
	if (this._fullCalendar) {
		mom._fullCalendar = true;
	}

	return mom;
};


// Time-of-day
// -------------------------------------------------------------------------------------------------

// GETTER
// Returns a Duration with the hours/minutes/seconds/ms values of the moment.
// If the moment has an ambiguous time, a duration of 00:00 will be returned.
//
// SETTER
// You can supply a Duration, a Moment, or a Duration-like argument.
// When setting the time, and the moment has an ambiguous time, it then becomes unambiguous.
newMomentProto.time = function(time) {

	// Fallback to the original method (if there is one) if this moment wasn't created via FullCalendar.
	// `time` is a generic enough method name where this precaution is necessary to avoid collisions w/ other plugins.
	if (!this._fullCalendar) {
		return oldMomentProto.time.apply(this, arguments);
	}

	if (time == null) { // getter
		return moment.duration({
			hours: this.hours(),
			minutes: this.minutes(),
			seconds: this.seconds(),
			milliseconds: this.milliseconds()
		});
	}
	else { // setter

		this._ambigTime = false; // mark that the moment now has a time

		if (!moment.isDuration(time) && !moment.isMoment(time)) {
			time = moment.duration(time);
		}

		// The day value should cause overflow (so 24 hours becomes 00:00:00 of next day).
		// Only for Duration times, not Moment times.
		var dayHours = 0;
		if (moment.isDuration(time)) {
			dayHours = Math.floor(time.asDays()) * 24;
		}

		// We need to set the individual fields.
		// Can't use startOf('day') then add duration. In case of DST at start of day.
		return this.hours(dayHours + time.hours())
			.minutes(time.minutes())
			.seconds(time.seconds())
			.milliseconds(time.milliseconds());
	}
};

// Converts the moment to UTC, stripping out its time-of-day and timezone offset,
// but preserving its YMD. A moment with a stripped time will display no time
// nor timezone offset when .format() is called.
newMomentProto.stripTime = function() {
	var a = this.toArray(); // year,month,date,hours,minutes,seconds as an array

	this.utc(); // set the internal UTC flag (will clear the ambig flags)
	setUTCValues(this, a.slice(0, 3)); // set the year/month/date. time will be zero

	// Mark the time as ambiguous. This needs to happen after the .utc() call, which calls .zone(),
	// which clears all ambig flags. Same with setUTCValues with moment-timezone.
	this._ambigTime = true;
	this._ambigZone = true; // if ambiguous time, also ambiguous timezone offset

	return this; // for chaining
};

// Returns if the moment has a non-ambiguous time (boolean)
newMomentProto.hasTime = function() {
	return !this._ambigTime;
};


// Timezone
// -------------------------------------------------------------------------------------------------

// Converts the moment to UTC, stripping out its timezone offset, but preserving its
// YMD and time-of-day. A moment with a stripped timezone offset will display no
// timezone offset when .format() is called.
newMomentProto.stripZone = function() {
	var a = this.toArray(); // year,month,date,hours,minutes,seconds as an array
	var wasAmbigTime = this._ambigTime;

	this.utc(); // set the internal UTC flag (will clear the ambig flags)
	setUTCValues(this, a); // will set the year/month/date/hours/minutes/seconds/ms

	if (wasAmbigTime) {
		// the above call to .utc()/.zone() unfortunately clears the ambig flags, so reassign
		this._ambigTime = true;
	}

	// Mark the zone as ambiguous. This needs to happen after the .utc() call, which calls .zone(),
	// which clears all ambig flags. Same with setUTCValues with moment-timezone.
	this._ambigZone = true;

	return this; // for chaining
};

// Returns of the moment has a non-ambiguous timezone offset (boolean)
newMomentProto.hasZone = function() {
	return !this._ambigZone;
};

// this method implicitly marks a zone (will get called upon .utc() and .local())
newMomentProto.zone = 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.zone.apply(this, arguments);
};

// this method implicitly marks a zone
newMomentProto.local = function() {
	var a = this.toArray(); // year,month,date,hours,minutes,seconds,ms as an array
	var wasAmbigZone = this._ambigZone;

	oldMomentProto.local.apply(this, arguments); // will clear ambig flags

	if (wasAmbigZone) {
		// If the moment was ambiguously zoned, the date fields were stored as UTC.
		// We want to preserve these, but in local time.
		setLocalValues(this, a);
	}

	return this; // for chaining
};


// Formatting
// -------------------------------------------------------------------------------------------------

newMomentProto.format = function() {
	if (this._fullCalendar && arguments[0]) { // an enhanced moment? and a format string provided?
		return formatDate(this, arguments[0]); // our extended formatting
	}
	if (this._ambigTime) {
		return oldMomentFormat(this, 'YYYY-MM-DD');
	}
	if (this._ambigZone) {
		return oldMomentFormat(this, 'YYYY-MM-DD[T]HH:mm:ss');
	}
	return oldMomentProto.format.apply(this, arguments);
};

newMomentProto.toISOString = function() {
	if (this._ambigTime) {
		return oldMomentFormat(this, 'YYYY-MM-DD');
	}
	if (this._ambigZone) {
		return oldMomentFormat(this, 'YYYY-MM-DD[T]HH:mm:ss');
	}
	return oldMomentProto.toISOString.apply(this, arguments);
};


// Querying
// -------------------------------------------------------------------------------------------------

// Is the moment within the specified range? `end` is exclusive.
// FYI, this method is not a standard Moment method, so always do our enhanced logic.
newMomentProto.isWithin = function(start, end) {
	var a = commonlyAmbiguate([ this, start, end ]);
	return a[0] >= a[1] && a[0] < a[2];
};

// When isSame is called with units, timezone ambiguity is normalized before the comparison happens.
// If no units specified, the two moments must be identically the same, with matching ambig flags.
newMomentProto.isSame = function(input, units) {
	var a;

	// only do custom logic if this is an enhanced moment
	if (!this._fullCalendar) {
		return oldMomentProto.isSame.apply(this, arguments);
	}

	if (units) {
		a = commonlyAmbiguate([ this, input ], true); // normalize timezones but don't erase times
		return oldMomentProto.isSame.call(a[0], a[1], units);
	}
	else {
		input = fc.moment.parseZone(input); // normalize input
		return oldMomentProto.isSame.call(this, input) &&
			Boolean(this._ambigTime) === Boolean(input._ambigTime) &&
			Boolean(this._ambigZone) === Boolean(input._ambigZone);
	}
};

// Make these query methods work with ambiguous moments
$.each([
	'isBefore',
	'isAfter'
], function(i, methodName) {
	newMomentProto[methodName] = function(input, units) {
		var a;

		// only do custom logic if this is an enhanced moment
		if (!this._fullCalendar) {
			return oldMomentProto[methodName].apply(this, arguments);
		}

		a = commonlyAmbiguate([ this, input ]);
		return oldMomentProto[methodName].call(a[0], a[1], units);
	};
});


// Misc Internals
// -------------------------------------------------------------------------------------------------

// given an array of moment-like inputs, return a parallel array w/ moments similarly ambiguated.
// for example, of one moment has ambig time, but not others, all moments will have their time stripped.
// set `preserveTime` to `true` to keep times, but only normalize zone ambiguity.
function commonlyAmbiguate(inputs, preserveTime) {
	var outputs = [];
	var anyAmbigTime = false;
	var anyAmbigZone = false;
	var i;

	for (i=0; i<inputs.length; i++) {
		outputs.push(fc.moment.parseZone(inputs[i]));
		anyAmbigTime = anyAmbigTime || outputs[i]._ambigTime;
		anyAmbigZone = anyAmbigZone || outputs[i]._ambigZone;
	}

	for (i=0; i<outputs.length; i++) {
		if (anyAmbigTime && !preserveTime) {
			outputs[i].stripTime();
		}
		else if (anyAmbigZone) {
			outputs[i].stripZone();
		}
	}

	return outputs;
}

// Transfers all the flags related to ambiguous time/zone from the `src` moment to the `dest` moment
function transferAmbigs(src, dest) {
	if (src._ambigTime) {
		dest._ambigTime = true;
	}
	else if (dest._ambigTime) {
		dest._ambigTime = false;
	}

	if (src._ambigZone) {
		dest._ambigZone = true;
	}
	else if (dest._ambigZone) {
		dest._ambigZone = false;
	}
}


// Sets the year/month/date/etc values of the moment from the given array.
// Inefficient because it calls each individual setter.
function setMomentValues(mom, a) {
	mom.year(a[0] || 0)
		.month(a[1] || 0)
		.date(a[2] || 0)
		.hours(a[3] || 0)
		.minutes(a[4] || 0)
		.seconds(a[5] || 0)
		.milliseconds(a[6] || 0);
}

// Can we set the moment's internal date directly?
allowValueOptimization = '_d' in moment() && 'updateOffset' in moment;

// Utility function. Accepts a moment and an array of the UTC year/month/date/etc values to set.
// Assumes the given moment is already in UTC mode.
setUTCValues = allowValueOptimization ? function(mom, a) {
	// simlate what moment's accessors do
	mom._d.setTime(Date.UTC.apply(Date, a));
	moment.updateOffset(mom, false); // keepTime=false
} : setMomentValues;

// Utility function. Accepts a moment and an array of the local year/month/date/etc values to set.
// Assumes the given moment is already in local mode.
setLocalValues = allowValueOptimization ? function(mom, a) {
	// simlate what moment's accessors do
	mom._d.setTime(+new Date( // FYI, there is now way to apply an array of args to a constructor
		a[0] || 0,
		a[1] || 0,
		a[2] || 0,
		a[3] || 0,
		a[4] || 0,
		a[5] || 0,
		a[6] || 0
	));
	moment.updateOffset(mom, false); // keepTime=false
} : setMomentValues;

;;

// Single Date Formatting
// -------------------------------------------------------------------------------------------------


// call this if you want Moment's original format method to be used
function oldMomentFormat(mom, formatStr) {
	return oldMomentProto.format.call(mom, formatStr); // oldMomentProto defined in moment-ext.js
}


// Formats `date` with a Moment formatting string, but allow our non-zero areas and
// additional token.
function formatDate(date, formatStr) {
	return formatDateWithChunks(date, getFormatStringChunks(formatStr));
}


function formatDateWithChunks(date, chunks) {
	var s = '';
	var i;

	for (i=0; i<chunks.length; i++) {
		s += formatDateWithChunk(date, chunks[i]);
	}

	return s;
}


// addition formatting tokens we want recognized
var tokenOverrides = {
	t: function(date) { // "a" or "p"
		return oldMomentFormat(date, 'a').charAt(0);
	},
	T: function(date) { // "A" or "P"
		return oldMomentFormat(date, 'A').charAt(0);
	}
};


function formatDateWithChunk(date, chunk) {
	var token;
	var maybeStr;

	if (typeof chunk === 'string') { // a literal string
		return chunk;
	}
	else if ((token = chunk.token)) { // a token, like "YYYY"
		if (tokenOverrides[token]) {
			return tokenOverrides[token](date); // use our custom token
		}
		return oldMomentFormat(date, token);
	}
	else if (chunk.maybe) { // a grouping of other chunks that must be non-zero
		maybeStr = formatDateWithChunks(date, chunk.maybe);
		if (maybeStr.match(/[1-9]/)) {
			return maybeStr;
		}
	}

	return '';
}


// Date Range Formatting
// -------------------------------------------------------------------------------------------------
// TODO: make it work with timezone offset

// Using a formatting string meant for a single date, generate a range string, like
// "Sep 2 - 9 2013", that intelligently inserts a separator where the dates differ.
// If the dates are the same as far as the format string is concerned, just return a single
// rendering of one date, without any separator.
function formatRange(date1, date2, formatStr, separator, isRTL) {
	var localeData;

	date1 = fc.moment.parseZone(date1);
	date2 = fc.moment.parseZone(date2);

	localeData = (date1.localeData || date1.lang).call(date1); // works with moment-pre-2.8

	// Expand localized format strings, like "LL" -> "MMMM D YYYY"
	formatStr = localeData.longDateFormat(formatStr) || formatStr;
	// BTW, this is not important for `formatDate` because it is impossible to put custom tokens
	// or non-zero areas in Moment's localized format strings.

	separator = separator || ' - ';

	return formatRangeWithChunks(
		date1,
		date2,
		getFormatStringChunks(formatStr),
		separator,
		isRTL
	);
}
fc.formatRange = formatRange; // expose


function formatRangeWithChunks(date1, date2, chunks, separator, isRTL) {
	var chunkStr; // the rendering of the chunk
	var leftI;
	var leftStr = '';
	var rightI;
	var rightStr = '';
	var middleI;
	var middleStr1 = '';
	var middleStr2 = '';
	var middleStr = '';

	// Start at the leftmost side of the formatting string and continue until you hit a token
	// that is not the same between dates.
	for (leftI=0; leftI<chunks.length; leftI++) {
		chunkStr = formatSimilarChunk(date1, date2, chunks[leftI]);
		if (chunkStr === false) {
			break;
		}
		leftStr += chunkStr;
	}

	// Similarly, start at the rightmost side of the formatting string and move left
	for (rightI=chunks.length-1; rightI>leftI; rightI--) {
		chunkStr = formatSimilarChunk(date1, date2, chunks[rightI]);
		if (chunkStr === false) {
			break;
		}
		rightStr = chunkStr + rightStr;
	}

	// The area in the middle is different for both of the dates.
	// Collect them distinctly so we can jam them together later.
	for (middleI=leftI; middleI<=rightI; middleI++) {
		middleStr1 += formatDateWithChunk(date1, chunks[middleI]);
		middleStr2 += formatDateWithChunk(date2, chunks[middleI]);
	}

	if (middleStr1 || middleStr2) {
		if (isRTL) {
			middleStr = middleStr2 + separator + middleStr1;
		}
		else {
			middleStr = middleStr1 + separator + middleStr2;
		}
	}

	return leftStr + middleStr + rightStr;
}


var similarUnitMap = {
	Y: 'year',
	M: 'month',
	D: 'day', // day of month
	d: 'day', // day of week
	// prevents a separator between anything time-related...
	A: 'second', // AM/PM
	a: 'second', // am/pm
	T: 'second', // A/P
	t: 'second', // a/p
	H: 'second', // hour (24)
	h: 'second', // hour (12)
	m: 'second', // minute
	s: 'second' // second
};
// TODO: week maybe?


// Given a formatting chunk, and given that both dates are similar in the regard the
// formatting chunk is concerned, format date1 against `chunk`. Otherwise, return `false`.
function formatSimilarChunk(date1, date2, chunk) {
	var token;
	var unit;

	if (typeof chunk === 'string') { // a literal string
		return chunk;
	}
	else if ((token = chunk.token)) {
		unit = similarUnitMap[token.charAt(0)];
		// are the dates the same for this unit of measurement?
		if (unit && date1.isSame(date2, unit)) {
			return oldMomentFormat(date1, token); // would be the same if we used `date2`
			// BTW, don't support custom tokens
		}
	}

	return false; // the chunk is NOT the same for the two dates
	// BTW, don't support splitting on non-zero areas
}


// Chunking Utils
// -------------------------------------------------------------------------------------------------


var formatStringChunkCache = {};


function getFormatStringChunks(formatStr) {
	if (formatStr in formatStringChunkCache) {
		return formatStringChunkCache[formatStr];
	}
	return (formatStringChunkCache[formatStr] = chunkFormatString(formatStr));
}


// Break the formatting string into an array of chunks
function chunkFormatString(formatStr) {
	var chunks = [];
	var chunker = /\[([^\]]*)\]|\(([^\)]*)\)|(LT|(\w)\4*o?)|([^\w\[\(]+)/g; // TODO: more descrimination
	var match;

	while ((match = chunker.exec(formatStr))) {
		if (match[1]) { // a literal string inside [ ... ]
			chunks.push(match[1]);
		}
		else if (match[2]) { // non-zero formatting inside ( ... )
			chunks.push({ maybe: chunkFormatString(match[2]) });
		}
		else if (match[3]) { // a formatting token
			chunks.push({ token: match[3] });
		}
		else if (match[5]) { // an unenclosed literal string
			chunks.push(match[5]);
		}
	}

	return chunks;
}

;;

/* 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)
*/

function Popover(options) {
	this.options = options || {};
}


Popover.prototype = {

	isHidden: true,
	options: null,
	el: null, // the container element for the popover. generated by this object
	documentMousedownProxy: null, // document mousedown handler bound to `this`
	margin: 10, // the space required between the popover and the edges of the scroll container


	// Shows the popover on the specified position. Renders it if not already
	show: function() {
		if (this.isHidden) {
			if (!this.el) {
				this.render();
			}
			this.el.show();
			this.position();
			this.isHidden = false;
			this.trigger('show');
		}
	},


	// Hides the popover, through CSS, but does not remove it from the DOM
	hide: function() {
		if (!this.isHidden) {
			this.el.hide();
			this.isHidden = true;
			this.trigger('hide');
		}
	},


	// Creates `this.el` and renders content inside of it
	render: function() {
		var _this = this;
		var options = this.options;

		this.el = $('<div class="fc-popover"/>')
			.addClass(options.className || '')
			.css({
				// position initially to the top left to avoid creating scrollbars
				top: 0,
				left: 0
			})
			.append(options.content)
			.appendTo(options.parentEl);

		// when a click happens on anything inside with a 'fc-close' className, hide the popover
		this.el.on('click', '.fc-close', function() {
			_this.hide();
		});

		if (options.autoHide) {
			$(document).on('mousedown', this.documentMousedownProxy = $.proxy(this, 'documentMousedown'));
		}
	},


	// Triggered when the user clicks *anywhere* in the document, for the autoHide feature
	documentMousedown: function(ev) {
		// only hide the popover if the click happened outside the popover
		if (this.el && !$(ev.target).closest(this.el).length) {
			this.hide();
		}
	},


	// Hides and unregisters any handlers
	destroy: function() {
		this.hide();

		if (this.el) {
			this.el.remove();
			this.el = null;
		}

		$(document).off('mousedown', this.documentMousedownProxy);
	},


	// Positions the popover optimally, using the top/left/right options
	position: function() {
		var options = this.options;
		var origin = this.el.offsetParent().offset();
		var width = this.el.outerWidth();
		var height = this.el.outerHeight();
		var windowEl = $(window);
		var viewportEl = getScrollParent(this.el);
		var viewportTop;
		var viewportLeft;
		var viewportOffset;
		var top; // the "position" (not "offset") values for the popover
		var left; //

		// compute top and left
		top = options.top || 0;
		if (options.left !== undefined) {
			left = options.left;
		}
		else if (options.right !== undefined) {
			left = options.right - width; // derive the left value from the right value
		}
		else {
			left = 0;
		}

		if (viewportEl.is(window) || viewportEl.is(document)) { // normalize getScrollParent's result
			viewportEl = windowEl;
			viewportTop = 0; // the window is always at the top left
			viewportLeft = 0; // (and .offset() won't work if called here)
		}
		else {
			viewportOffset = viewportEl.offset();
			viewportTop = viewportOffset.top;
			viewportLeft = viewportOffset.left;
		}

		// if the window is scrolled, it causes the visible area to be further down
		viewportTop += windowEl.scrollTop();
		viewportLeft += windowEl.scrollLeft();

		// constrain to the view port. if constrained by two edges, give precedence to top/left
		if (options.viewportConstrain !== false) {
			top = Math.min(top, viewportTop + viewportEl.outerHeight() - height - this.margin);
			top = Math.max(top, viewportTop + this.margin);
			left = Math.min(left, viewportLeft + viewportEl.outerWidth() - width - this.margin);
			left = Math.max(left, viewportLeft + this.margin);
		}

		this.el.css({
			top: top - origin.top,
			left: left - origin.left
		});
	},


	// Triggers a callback. Calls a function in the option hash of the same name.
	// Arguments beyond the first `name` are forwarded on.
	// TODO: better code reuse for this. Repeat code
	trigger: function(name) {
		if (this.options[name]) {
			this.options[name].apply(this, Array.prototype.slice.call(arguments, 1));
		}
	}

};

;;

/* A "coordinate map" converts pixel coordinates into an associated cell, which has an associated date
------------------------------------------------------------------------------------------------------------------------
Common interface:

	CoordMap.prototype = {
		build: function() {},
		getCell: function(x, y) {}
	};

*/

/* Coordinate map for a grid component
----------------------------------------------------------------------------------------------------------------------*/

function GridCoordMap(grid) {
	this.grid = grid;
}


GridCoordMap.prototype = {

	grid: null, // reference to the Grid
	rows: null, // the top-to-bottom y coordinates. including the bottom of the last item
	cols: null, // the left-to-right x coordinates. including the right of the last item

	containerEl: null, // container element that all coordinates are constrained to. optionally assigned
	minX: null,
	maxX: null, // exclusive
	minY: null,
	maxY: null, // exclusive


	// Queries the grid for the coordinates of all the cells
	build: function() {
		this.grid.buildCoords(
			this.rows = [],
			this.cols = []
		);
		this.computeBounds();
	},


	// Given a coordinate of the document, gets the associated cell. If no cell is underneath, returns null
	getCell: function(x, y) {
		var cell = null;
		var rows = this.rows;
		var cols = this.cols;
		var r = -1;
		var c = -1;
		var i;

		if (this.inBounds(x, y)) {

			for (i = 0; i < rows.length; i++) {
				if (y >= rows[i][0] && y < rows[i][1]) {
					r = i;
					break;
				}
			}

			for (i = 0; i < cols.length; i++) {
				if (x >= cols[i][0] && x < cols[i][1]) {
					c = i;
					break;
				}
			}

			if (r >= 0 && c >= 0) {
				cell = { row: r, col: c };
				cell.grid = this.grid;
				cell.date = this.grid.getCellDate(cell);
			}
		}

		return cell;
	},


	// If there is a containerEl, compute the bounds into min/max values
	computeBounds: function() {
		var containerOffset;

		if (this.containerEl) {
			containerOffset = this.containerEl.offset();
			this.minX = containerOffset.left;
			this.maxX = containerOffset.left + this.containerEl.outerWidth();
			this.minY = containerOffset.top;
			this.maxY = containerOffset.top + this.containerEl.outerHeight();
		}
	},


	// Determines if the given coordinates are in bounds. If no `containerEl`, always true
	inBounds: function(x, y) {
		if (this.containerEl) {
			return x >= this.minX && x < this.maxX && y >= this.minY && y < this.maxY;
		}
		return true;
	}

};


/* Coordinate map that is a combination of multiple other coordinate maps
----------------------------------------------------------------------------------------------------------------------*/

function ComboCoordMap(coordMaps) {
	this.coordMaps = coordMaps;
}


ComboCoordMap.prototype = {

	coordMaps: null, // an array of CoordMaps


	// Builds all coordMaps
	build: function() {
		var coordMaps = this.coordMaps;
		var i;

		for (i = 0; i < coordMaps.length; i++) {
			coordMaps[i].build();
		}
	},


	// Queries all coordMaps for the cell underneath the given coordinates, returning the first result
	getCell: function(x, y) {
		var coordMaps = this.coordMaps;
		var cell = null;
		var i;

		for (i = 0; i < coordMaps.length && !cell; i++) {
			cell = coordMaps[i].getCell(x, y);
		}

		return cell;
	}

};

;;

/* Tracks mouse movements over a CoordMap and raises events about which cell the mouse is over.
----------------------------------------------------------------------------------------------------------------------*/
// TODO: very useful to have a handler that gets called upon cellOut OR when dragging stops (for cleanup)

function DragListener(coordMap, options) {
	this.coordMap = coordMap;
	this.options = options || {};
}


DragListener.prototype = {

	coordMap: null,
	options: null,

	isListening: false,
	isDragging: false,

	// the cell/date the mouse was over when listening started
	origCell: null,
	origDate: null,

	// the cell/date the mouse is over
	cell: null,
	date: null,

	// coordinates of the initial mousedown
	mouseX0: null,
	mouseY0: null,

	// handler attached to the document, bound to the DragListener's `this`
	mousemoveProxy: null,
	mouseupProxy: null,

	scrollEl: null,
	scrollBounds: null, // { top, bottom, left, right }
	scrollTopVel: null, // pixels per second
	scrollLeftVel: null, // pixels per second
	scrollIntervalId: null, // ID of setTimeout for scrolling animation loop
	scrollHandlerProxy: null, // this-scoped function for handling when scrollEl is scrolled

	scrollSensitivity: 30, // pixels from edge for scrolling to start
	scrollSpeed: 200, // pixels per second, at maximum speed
	scrollIntervalMs: 50, // millisecond wait between scroll increment


	// Call this when the user does a mousedown. Will probably lead to startListening
	mousedown: function(ev) {
		if (isPrimaryMouseButton(ev)) {

			ev.preventDefault(); // prevents native selection in most browsers

			this.startListening(ev);

			// start the drag immediately if there is no minimum distance for a drag start
			if (!this.options.distance) {
				this.startDrag(ev);
			}
		}
	},


	// Call this to start tracking mouse movements
	startListening: function(ev) {
		var scrollParent;
		var cell;

		if (!this.isListening) {

			// grab scroll container and attach handler
			if (ev && this.options.scroll) {
				scrollParent = getScrollParent($(ev.target));
				if (!scrollParent.is(window) && !scrollParent.is(document)) {
					this.scrollEl = scrollParent;

					// scope to `this`, and use `debounce` to make sure rapid calls don't happen
					this.scrollHandlerProxy = debounce($.proxy(this, 'scrollHandler'), 100);
					this.scrollEl.on('scroll', this.scrollHandlerProxy);
				}
			}

			this.computeCoords(); // relies on `scrollEl`

			// get info on the initial cell, date, and coordinates
			if (ev) {
				cell = this.getCell(ev);
				this.origCell = cell;
				this.origDate = cell ? cell.date : null;

				this.mouseX0 = ev.pageX;
				this.mouseY0 = ev.pageY;
			}

			$(document)
				.on('mousemove', this.mousemoveProxy = $.proxy(this, 'mousemove'))
				.on('mouseup', this.mouseupProxy = $.proxy(this, 'mouseup'))
				.on('selectstart', this.preventDefault); // prevents native selection in IE<=8

			this.isListening = true;
			this.trigger('listenStart', ev);
		}
	},


	// Recomputes the drag-critical positions of elements
	computeCoords: function() {
		this.coordMap.build();
		this.computeScrollBounds();
	},


	// Called when the user moves the mouse
	mousemove: function(ev) {
		var minDistance;
		var distanceSq; // current distance from mouseX0/mouseY0, squared

		if (!this.isDragging) { // if not already dragging...
			// then start the drag if the minimum distance criteria is met
			minDistance = this.options.distance || 1;
			distanceSq = Math.pow(ev.pageX - this.mouseX0, 2) + Math.pow(ev.pageY - this.mouseY0, 2);
			if (distanceSq >= minDistance * minDistance) { // use pythagorean theorem
				this.startDrag(ev);
			}
		}

		if (this.isDragging) {
			this.drag(ev); // report a drag, even if this mousemove initiated the drag
		}
	},


	// Call this to initiate a legitimate drag.
	// This function is called internally from this class, but can also be called explicitly from outside
	startDrag: function(ev) {
		var cell;

		if (!this.isListening) { // startDrag must have manually initiated
			this.startListening();
		}

		if (!this.isDragging) {
			this.isDragging = true;
			this.trigger('dragStart', ev);

			// report the initial cell the mouse is over
			cell = this.getCell(ev);
			if (cell) {
				this.cellOver(cell, true);
			}
		}
	},


	// Called while the mouse is being moved and when we know a legitimate drag is taking place
	drag: function(ev) {
		var cell;

		if (this.isDragging) {
			cell = this.getCell(ev);

			if (!isCellsEqual(cell, this.cell)) { // a different cell than before?
				if (this.cell) {
					this.cellOut();
				}
				if (cell) {
					this.cellOver(cell);
				}
			}

			this.dragScroll(ev); // will possibly cause scrolling
		}
	},


	// Called when a the mouse has just moved over a new cell
	cellOver: function(cell) {
		this.cell = cell;
		this.date = cell.date;
		this.trigger('cellOver', cell, cell.date);
	},


	// Called when the mouse has just moved out of a cell
	cellOut: function() {
		if (this.cell) {
			this.trigger('cellOut', this.cell);
			this.cell = null;
			this.date = null;
		}
	},


	// Called when the user does a mouseup
	mouseup: function(ev) {
		this.stopDrag(ev);
		this.stopListening(ev);
	},


	// Called when the drag is over. Will not cause listening to stop however.
	// A concluding 'cellOut' event will NOT be triggered.
	stopDrag: function(ev) {
		if (this.isDragging) {
			this.stopScrolling();
			this.trigger('dragStop', ev);
			this.isDragging = false;
		}
	},


	// Call this to stop listening to the user's mouse events
	stopListening: function(ev) {
		if (this.isListening) {

			// remove the scroll handler if there is a scrollEl
			if (this.scrollEl) {
				this.scrollEl.off('scroll', this.scrollHandlerProxy);
				this.scrollHandlerProxy = null;
			}

			$(document)
				.off('mousemove', this.mousemoveProxy)
				.off('mouseup', this.mouseupProxy)
				.off('selectstart', this.preventDefault);

			this.mousemoveProxy = null;
			this.mouseupProxy = null;

			this.isListening = false;
			this.trigger('listenStop', ev);

			this.origCell = this.cell = null;
			this.origDate = this.date = null;
		}
	},


	// Gets the cell underneath the coordinates for the given mouse event
	getCell: function(ev) {
		return this.coordMap.getCell(ev.pageX, ev.pageY);
	},


	// Triggers a callback. Calls a function in the option hash of the same name.
	// Arguments beyond the first `name` are forwarded on.
	trigger: function(name) {
		if (this.options[name]) {
			this.options[name].apply(this, Array.prototype.slice.call(arguments, 1));
		}
	},


	// Stops a given mouse event from doing it's native browser action. In our case, text selection.
	preventDefault: function(ev) {
		ev.preventDefault();
	},


	/* Scrolling
	------------------------------------------------------------------------------------------------------------------*/


	// Computes and stores the bounding rectangle of scrollEl
	computeScrollBounds: function() {
		var el = this.scrollEl;
		var offset;

		if (el) {
			offset = el.offset();
			this.scrollBounds = {
				top: offset.top,
				left: offset.left,
				bottom: offset.top + el.outerHeight(),
				right: offset.left + el.outerWidth()
			};
		}
	},


	// Called when the dragging is in progress and scrolling should be updated
	dragScroll: function(ev) {
		var sensitivity = this.scrollSensitivity;
		var bounds = this.scrollBounds;
		var topCloseness, bottomCloseness;
		var leftCloseness, rightCloseness;
		var topVel = 0;
		var leftVel = 0;

		if (bounds) { // only scroll if scrollEl exists

			// compute closeness to edges. valid range is from 0.0 - 1.0
			topCloseness = (sensitivity - (ev.pageY - bounds.top)) / sensitivity;
			bottomCloseness = (sensitivity - (bounds.bottom - ev.pageY)) / sensitivity;
			leftCloseness = (sensitivity - (ev.pageX - bounds.left)) / sensitivity;
			rightCloseness = (sensitivity - (bounds.right - ev.pageX)) / sensitivity;

			// translate vertical closeness into velocity.
			// mouse must be completely in bounds for velocity to happen.
			if (topCloseness >= 0 && topCloseness <= 1) {
				topVel = topCloseness * this.scrollSpeed * -1; // negative. for scrolling up
			}
			else if (bottomCloseness >= 0 && bottomCloseness <= 1) {
				topVel = bottomCloseness * this.scrollSpeed;
			}

			// translate horizontal closeness into velocity
			if (leftCloseness >= 0 && leftCloseness <= 1) {
				leftVel = leftCloseness * this.scrollSpeed * -1; // negative. for scrolling left
			}
			else if (rightCloseness >= 0 && rightCloseness <= 1) {
				leftVel = rightCloseness * this.scrollSpeed;
			}
		}

		this.setScrollVel(topVel, leftVel);
	},


	// Sets the speed-of-scrolling for the scrollEl
	setScrollVel: function(topVel, leftVel) {

		this.scrollTopVel = topVel;
		this.scrollLeftVel = leftVel;

		this.constrainScrollVel(); // massages into realistic values

		// if there is non-zero velocity, and an animation loop hasn't already started, then START
		if ((this.scrollTopVel || this.scrollLeftVel) && !this.scrollIntervalId) {
			this.scrollIntervalId = setInterval(
				$.proxy(this, 'scrollIntervalFunc'), // scope to `this`
				this.scrollIntervalMs
			);
		}
	},


	// Forces scrollTopVel and scrollLeftVel to be zero if scrolling has already gone all the way
	constrainScrollVel: function() {
		var el = this.scrollEl;

		if (this.scrollTopVel < 0) { // scrolling up?
			if (el.scrollTop() <= 0) { // already scrolled all the way up?
				this.scrollTopVel = 0;
			}
		}
		else if (this.scrollTopVel > 0) { // scrolling down?
			if (el.scrollTop() + el[0].clientHeight >= el[0].scrollHeight) { // already scrolled all the way down?
				this.scrollTopVel = 0;
			}
		}

		if (this.scrollLeftVel < 0) { // scrolling left?
			if (el.scrollLeft() <= 0) { // already scrolled all the left?
				this.scrollLeftVel = 0;
			}
		}
		else if (this.scrollLeftVel > 0) { // scrolling right?
			if (el.scrollLeft() + el[0].clientWidth >= el[0].scrollWidth) { // already scrolled all the way right?
				this.scrollLeftVel = 0;
			}
		}
	},


	// This function gets called during every iteration of the scrolling animation loop
	scrollIntervalFunc: function() {
		var el = this.scrollEl;
		var frac = this.scrollIntervalMs / 1000; // considering animation frequency, what the vel should be mult'd by

		// change the value of scrollEl's scroll
		if (this.scrollTopVel) {
			el.scrollTop(el.scrollTop() + this.scrollTopVel * frac);
		}
		if (this.scrollLeftVel) {
			el.scrollLeft(el.scrollLeft() + this.scrollLeftVel * frac);
		}

		this.constrainScrollVel(); // since the scroll values changed, recompute the velocities

		// if scrolled all the way, which causes the vels to be zero, stop the animation loop
		if (!this.scrollTopVel && !this.scrollLeftVel) {
			this.stopScrolling();
		}
	},


	// Kills any existing scrolling animation loop
	stopScrolling: function() {
		if (this.scrollIntervalId) {
			clearInterval(this.scrollIntervalId);
			this.scrollIntervalId = null;

			// when all done with scrolling, recompute positions since they probably changed
			this.computeCoords();
		}
	},


	// Get called when the scrollEl is scrolled (NOTE: this is delayed via debounce)
	scrollHandler: function() {
		// recompute all coordinates, but *only* if this is *not* part of our scrolling animation
		if (!this.scrollIntervalId) {
			this.computeCoords();
		}
	}

};


// Returns `true` if the cells are identically equal. `false` otherwise.
// They must have the same row, col, and be from the same grid.
// Two null values will be considered equal, as two "out of the grid" states are the same.
function isCellsEqual(cell1, cell2) {

	if (!cell1 && !cell2) {
		return true;
	}

	if (cell1 && cell2) {
		return cell1.grid === cell2.grid &&
			cell1.row === cell2.row &&
			cell1.col === cell2.col;
	}

	return false;
}

;;

/* Creates a clone of an element and lets it track the mouse as it moves
----------------------------------------------------------------------------------------------------------------------*/

function MouseFollower(sourceEl, options) {
	this.options = options = options || {};
	this.sourceEl = sourceEl;
	this.parentEl = options.parentEl ? $(options.parentEl) : sourceEl.parent(); // default to sourceEl's parent
}


MouseFollower.prototype = {

	options: null,

	sourceEl: null, // the element that will be cloned and made to look like it is dragging
	el: null, // the clone of `sourceEl` that will track the mouse
	parentEl: null, // the element that `el` (the clone) will be attached to

	// the initial position of el, relative to the offset parent. made to match the initial offset of sourceEl
	top0: null,
	left0: null,

	// the initial position of the mouse
	mouseY0: null,
	mouseX0: null,

	// the number of pixels the mouse has moved from its initial position
	topDelta: null,
	leftDelta: null,

	mousemoveProxy: null, // document mousemove handler, bound to the MouseFollower's `this`

	isFollowing: false,
	isHidden: false,
	isAnimating: false, // doing the revert animation?


	// Causes the element to start following the mouse
	start: function(ev) {
		if (!this.isFollowing) {
			this.isFollowing = true;

			this.mouseY0 = ev.pageY;
			this.mouseX0 = ev.pageX;
			this.topDelta = 0;
			this.leftDelta = 0;

			if (!this.isHidden) {
				this.updatePosition();
			}

			$(document).on('mousemove', this.mousemoveProxy = $.proxy(this, 'mousemove'));
		}
	},


	// Causes the element to stop following the mouse. If shouldRevert is true, will animate back to original position.
	// `callback` gets invoked when the animation is complete. If no animation, it is invoked immediately.
	stop: function(shouldRevert, callback) {
		var _this = this;
		var revertDuration = this.options.revertDuration;

		function complete() {
			this.isAnimating = false;
			_this.destroyEl();

			this.top0 = this.left0 = null; // reset state for future updatePosition calls

			if (callback) {
				callback();
			}
		}

		if (this.isFollowing && !this.isAnimating) { // disallow more than one stop animation at a time
			this.isFollowing = false;

			$(document).off('mousemove', this.mousemoveProxy);

			if (shouldRevert && revertDuration && !this.isHidden) { // do a revert animation?
				this.isAnimating = true;
				this.el.animate({
					top: this.top0,
					left: this.left0
				}, {
					duration: revertDuration,
					complete: complete
				});
			}
			else {
				complete();
			}
		}
	},


	// Gets the tracking element. Create it if necessary
	getEl: function() {
		var el = this.el;

		if (!el) {
			this.sourceEl.width(); // hack to force IE8 to compute correct bounding box
			el = this.el = this.sourceEl.clone()
				.css({
					position: 'absolute',
					visibility: '', // in case original element was hidden (commonly through hideEvents())
					display: this.isHidden ? 'none' : '', // for when initially hidden
					margin: 0,
					right: 'auto', // erase and set width instead
					bottom: 'auto', // erase and set height instead
					width: this.sourceEl.width(), // explicit height in case there was a 'right' value
					height: this.sourceEl.height(), // explicit width in case there was a 'bottom' value
					opacity: this.options.opacity || '',
					zIndex: this.options.zIndex
				})
				.appendTo(this.parentEl);
		}

		return el;
	},


	// Removes the tracking element if it has already been created
	destroyEl: function() {
		if (this.el) {
			this.el.remove();
			this.el = null;
		}
	},


	// Update the CSS position of the tracking element
	updatePosition: function() {
		var sourceOffset;
		var origin;

		this.getEl(); // ensure this.el

		// make sure origin info was computed
		if (this.top0 === null) {
			this.sourceEl.width(); // hack to force IE8 to compute correct bounding box
			sourceOffset = this.sourceEl.offset();
			origin = this.el.offsetParent().offset();
			this.top0 = sourceOffset.top - origin.top;
			this.left0 = sourceOffset.left - origin.left;
		}

		this.el.css({
			top: this.top0 + this.topDelta,
			left: this.left0 + this.leftDelta
		});
	},


	// Gets called when the user moves the mouse
	mousemove: function(ev) {
		this.topDelta = ev.pageY - this.mouseY0;
		this.leftDelta = ev.pageX - this.mouseX0;

		if (!this.isHidden) {
			this.updatePosition();
		}
	},


	// Temporarily makes the tracking element invisible. Can be called before following starts
	hide: function() {
		if (!this.isHidden) {
			this.isHidden = true;
			if (this.el) {
				this.el.hide();
			}
		}
	},


	// Show the tracking element after it has been temporarily hidden
	show: function() {
		if (this.isHidden) {
			this.isHidden = false;
			this.updatePosition();
			this.getEl().show();
		}
	}

};

;;

/* A utility class for rendering <tr> rows.
----------------------------------------------------------------------------------------------------------------------*/
// It leverages methods of the subclass and the View to determine custom rendering behavior for each row "type"
// (such as highlight rows, day rows, helper rows, etc).

function RowRenderer(view) {
	this.view = view;
}


RowRenderer.prototype = {

	view: null, // a View object
	cellHtml: '<td/>', // plain default HTML used for a cell when no other is available


	// Renders the HTML for a row, leveraging custom cell-HTML-renderers based on the `rowType`.
	// Also applies the "intro" and "outro" cells, which are specified by the subclass and views.
	// `row` is an optional row number.
	rowHtml: function(rowType, row) {
		var view = this.view;
		var renderCell = this.getHtmlRenderer('cell', rowType);
		var cellHtml = '';
		var col;
		var date;

		row = row || 0;

		for (col = 0; col < view.colCnt; col++) {
			date = view.cellToDate(row, col);
			cellHtml += renderCell(row, col, date);
		}

		cellHtml = this.bookendCells(cellHtml, rowType, row); // apply intro and outro

		return '<tr>' + cellHtml + '</tr>';
	},


	// Applies the "intro" and "outro" HTML to the given cells.
	// Intro means the leftmost cell when the calendar is LTR and the rightmost cell when RTL. Vice-versa for outro.
	// `cells` can be an HTML string of <td>'s or a jQuery <tr> element
	// `row` is an optional row number.
	bookendCells: function(cells, rowType, row) {
		var view = this.view;
		var intro = this.getHtmlRenderer('intro', rowType)(row || 0);
		var outro = this.getHtmlRenderer('outro', rowType)(row || 0);
		var isRTL = view.opt('isRTL');
		var prependHtml = isRTL ? outro : intro;
		var appendHtml = isRTL ? intro : outro;

		if (typeof cells === 'string') {
			return prependHtml + cells + appendHtml;
		}
		else { // a jQuery <tr> element
			return cells.prepend(prependHtml).append(appendHtml);
		}
	},


	// Returns an HTML-rendering function given a specific `rendererName` (like cell, intro, or outro) and a specific
	// `rowType` (like day, eventSkeleton, helperSkeleton), which is optional.
	// If a renderer for the specific rowType doesn't exist, it will fall back to a generic renderer.
	// We will query the View object first for any custom rendering functions, then the methods of the subclass.
	getHtmlRenderer: function(rendererName, rowType) {
		var view = this.view;
		var generalName; // like "cellHtml"
		var specificName; // like "dayCellHtml". based on rowType
		var provider; // either the View or the RowRenderer subclass, whichever provided the method
		var renderer;

		generalName = rendererName + 'Html';
		if (rowType) {
			specificName = rowType + capitaliseFirstLetter(rendererName) + 'Html';
		}

		if (specificName && (renderer = view[specificName])) {
			provider = view;
		}
		else if (specificName && (renderer = this[specificName])) {
			provider = this;
		}
		else if ((renderer = view[generalName])) {
			provider = view;
		}
		else if ((renderer = this[generalName])) {
			provider = this;
		}

		if (typeof renderer === 'function') {
			return function() {
				return renderer.apply(provider, arguments) || ''; // use correct `this` and always return a string
			};
		}

		// the rendered can be a plain string as well. if not specified, always an empty string.
		return function() {
			return renderer || '';
		};
	}

};

;;

/* An abstract class comprised of a "grid" of cells that each represent a specific datetime
----------------------------------------------------------------------------------------------------------------------*/

function Grid(view) {
	RowRenderer.call(this, view); // call the super-constructor
	this.coordMap = new GridCoordMap(this);
	this.elsByFill = {};
}


Grid.prototype = createObject(RowRenderer.prototype); // declare the super-class
$.extend(Grid.prototype, {

	el: null, // the containing element
	coordMap: null, // a GridCoordMap that converts pixel values to datetimes
	cellDuration: null, // a cell's duration. subclasses must assign this ASAP
	elsByFill: null, // a hash of jQuery element sets used for rendering each fill. Keyed by fill name.


	// Renders the grid into the `el` element.
	// Subclasses should override and call this super-method when done.
	render: function() {
		this.bindHandlers();
	},


	// Called when the grid's resources need to be cleaned up
	destroy: function() {
		// subclasses can implement
	},


	/* Coordinates & Cells
	------------------------------------------------------------------------------------------------------------------*/


	// Populates the given empty arrays with the y and x coordinates of the cells
	buildCoords: function(rows, cols) {
		// subclasses must implement
	},


	// Given a cell object, returns the date for that cell
	getCellDate: function(cell) {
		// subclasses must implement
	},


	// Given a cell object, returns the element that represents the cell's whole-day
	getCellDayEl: function(cell) {
		// subclasses must implement
	},


	// Converts a range with an inclusive `start` and an exclusive `end` into an array of segment objects
	rangeToSegs: function(start, end) {
		// subclasses must implement
	},


	/* Handlers
	------------------------------------------------------------------------------------------------------------------*/


	// Attach handlers to `this.el`, using bubbling to listen to all ancestors.
	// We don't need to undo any of this in a "destroy" method, because the view will simply remove `this.el` from the
	// DOM and jQuery will be smart enough to garbage collect the handlers.
	bindHandlers: function() {
		var _this = this;

		this.el.on('mousedown', function(ev) {
			if (
				!$(ev.target).is('.fc-event-container *, .fc-more') && // not an an event element, or "more.." link
				!$(ev.target).closest('.fc-popover').length // not on a popover (like the "more.." events one)
			) {
				_this.dayMousedown(ev);
			}
		});

		this.bindSegHandlers(); // attach event-element-related handlers. in Grid.events.js
	},


	// Process a mousedown on an element that represents a day. For day clicking and selecting.
	dayMousedown: function(ev) {
		var _this = this;
		var view = this.view;
		var calendar = view.calendar;
		var isSelectable = view.opt('selectable');
		var dates = null; // the inclusive dates of the selection. will be null if no selection
		var start; // the inclusive start of the selection
		var end; // the *exclusive* end of the selection
		var dayEl;

		// this listener tracks a mousedown on a day element, and a subsequent drag.
		// if the drag ends on the same day, it is a 'dayClick'.
		// if 'selectable' is enabled, this listener also detects selections.
		var dragListener = new DragListener(this.coordMap, {
			//distance: 5, // needs more work if we want dayClick to fire correctly
			scroll: view.opt('dragScroll'),
			dragStart: function() {
				view.unselect(); // since we could be rendering a new selection, we want to clear any old one
			},
			cellOver: function(cell, date) {
				if (dragListener.origDate) { // click needs to have started on a cell

					dayEl = _this.getCellDayEl(cell);

					dates = [ date, dragListener.origDate ].sort(compareNumbers); // works with Moments
					start = dates[0];
					end = dates[1].clone().add(_this.cellDuration);

					if (isSelectable) {
						if (calendar.isSelectionAllowedInRange(start, end)) { // allowed to select within this range?
							_this.renderSelection(start, end);
						}
						else {
							dates = null; // flag for an invalid selection
							disableCursor();
						}
					}
				}
			},
			cellOut: function(cell, date) {
				dates = null;
				_this.destroySelection();
				enableCursor();
			},
			listenStop: function(ev) {
				if (dates) { // started and ended on a cell?
					if (dates[0].isSame(dates[1])) {
						view.trigger('dayClick', dayEl[0], start, ev);
					}
					if (isSelectable) {
						// the selection will already have been rendered. just report it
						view.reportSelection(start, end, ev);
					}
				}
				enableCursor();
			}
		});

		dragListener.mousedown(ev); // start listening, which will eventually initiate a dragStart
	},


	/* Event Dragging
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of a event being dragged over the given date(s).
	// `end` can be null, as well as `seg`. See View's documentation on renderDrag for more info.
	// A returned value of `true` signals that a mock "helper" event has been rendered.
	renderDrag: function(start, end, seg) {
		// subclasses must implement
	},


	// Unrenders a visual indication of an event being dragged
	destroyDrag: function() {
		// subclasses must implement
	},


	/* Event Resizing
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of an event being resized.
	// `start` and `end` are the updated dates of the event. `seg` is the original segment object involved in the drag.
	renderResize: function(start, end, seg) {
		// subclasses must implement
	},


	// Unrenders a visual indication of an event being resized.
	destroyResize: function() {
		// subclasses must implement
	},


	/* Event Helper
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a mock event over the given date(s).
	// `end` can be null, in which case the mock event that is rendered will have a null end time.
	// `sourceSeg` is the internal segment object involved in the drag. If null, something external is dragging.
	renderRangeHelper: function(start, end, sourceSeg) {
		var view = this.view;
		var fakeEvent;

		// compute the end time if forced to do so (this is what EventManager does)
		if (!end && view.opt('forceEventDuration')) {
			end = view.calendar.getDefaultEventEnd(!start.hasTime(), start);
		}

		fakeEvent = sourceSeg ? createObject(sourceSeg.event) : {}; // mask the original event object if possible
		fakeEvent.start = start;
		fakeEvent.end = end;
		fakeEvent.allDay = !(start.hasTime() || (end && end.hasTime())); // freshly compute allDay

		// this extra className will be useful for differentiating real events from mock events in CSS
		fakeEvent.className = (fakeEvent.className || []).concat('fc-helper');

		// if something external is being dragged in, don't render a resizer
		if (!sourceSeg) {
			fakeEvent.editable = false;
		}

		this.renderHelper(fakeEvent, sourceSeg); // do the actual rendering
	},


	// Renders a mock event
	renderHelper: function(event, sourceSeg) {
		// subclasses must implement
	},


	// Unrenders a mock event
	destroyHelper: function() {
		// subclasses must implement
	},


	/* Selection
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of a selection. Will highlight by default but can be overridden by subclasses.
	renderSelection: function(start, end) {
		this.renderHighlight(start, end);
	},


	// Unrenders any visual indications of a selection. Will unrender a highlight by default.
	destroySelection: function() {
		this.destroyHighlight();
	},


	/* Highlight
	------------------------------------------------------------------------------------------------------------------*/


	// Renders an emphasis on the given date range. `start` is inclusive. `end` is exclusive.
	renderHighlight: function(start, end) {
		this.renderFill('highlight', this.rangeToSegs(start, end));
	},


	// Unrenders the emphasis on a date range
	destroyHighlight: function() {
		this.destroyFill('highlight');
	},


	// Generates an array of classNames for rendering the highlight. Used by the fill system.
	highlightSegClasses: function() {
		return [ 'fc-highlight' ];
	},


	/* Fill System (highlight, background events, business hours)
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a set of rectangles over the given segments of time.
	// Returns a subset of segs, the segs that were actually rendered.
	// Responsible for populating this.elsByFill
	renderFill: function(type, segs) {
		// subclasses must implement
	},


	// Unrenders a specific type of fill that is currently rendered on the grid
	destroyFill: function(type) {
		var el = this.elsByFill[type];

		if (el) {
			el.remove();
			delete this.elsByFill[type];
		}
	},


	// Renders and assigns an `el` property for each fill segment. Generic enough to work with different types.
	// Only returns segments that successfully rendered.
	// To be harnessed by renderFill (implemented by subclasses).
	// Analagous to renderFgSegEls.
	renderFillSegEls: function(type, segs) {
		var _this = this;
		var segElMethod = this[type + 'SegEl'];
		var html = '';
		var renderedSegs = [];
		var i;

		if (segs.length) {

			// build a large concatenation of segment HTML
			for (i = 0; i < segs.length; i++) {
				html += this.fillSegHtml(type, segs[i]);
			}

			// Grab individual elements from the combined HTML string. Use each as the default rendering.
			// Then, compute the 'el' for each segment.
			$(html).each(function(i, node) {
				var seg = segs[i];
				var el = $(node);

				// allow custom filter methods per-type
				if (segElMethod) {
					el = segElMethod.call(_this, seg, el);
				}

				if (el) { // custom filters did not cancel the render
					el = $(el); // allow custom filter to return raw DOM node

					// correct element type? (would be bad if a non-TD were inserted into a table for example)
					if (el.is(_this.fillSegTag)) {
						seg.el = el;
						renderedSegs.push(seg);
					}
				}
			});
		}

		return renderedSegs;
	},


	fillSegTag: 'div', // subclasses can override


	// Builds the HTML needed for one fill segment. Generic enought o work with different types.
	fillSegHtml: function(type, seg) {
		var classesMethod = this[type + 'SegClasses']; // custom hooks per-type
		var stylesMethod = this[type + 'SegStyles']; //
		var classes = classesMethod ? classesMethod.call(this, seg) : [];
		var styles = stylesMethod ? stylesMethod.call(this, seg) : ''; // a semi-colon separated CSS property string

		return '<' + this.fillSegTag +
			(classes.length ? ' class="' + classes.join(' ') + '"' : '') +
			(styles ? ' style="' + styles + '"' : '') +
			' />';
	},


	/* Generic rendering utilities for subclasses
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a day-of-week header row
	headHtml: function() {
		return '' +
			'<div class="fc-row ' + this.view.widgetHeaderClass + '">' +
				'<table>' +
					'<thead>' +
						this.rowHtml('head') + // leverages RowRenderer
					'</thead>' +
				'</table>' +
			'</div>';
	},


	// Used by the `headHtml` method, via RowRenderer, for rendering the HTML of a day-of-week header cell
	headCellHtml: function(row, col, date) {
		var view = this.view;
		var calendar = view.calendar;
		var colFormat = view.opt('columnFormat');

		return '' +
			'<th class="fc-day-header ' + view.widgetHeaderClass + ' fc-' + dayIDs[date.day()] + '">' +
				htmlEscape(calendar.formatDate(date, colFormat)) +
			'</th>';
	},


	// Renders the HTML for a single-day background cell
	bgCellHtml: function(row, col, date) {
		var view = this.view;
		var classes = this.getDayClasses(date);

		classes.unshift('fc-day', view.widgetContentClass);

		return '<td class="' + classes.join(' ') + '" data-date="' + date.format() + '"></td>';
	},


	// Computes HTML classNames for a single-day cell
	getDayClasses: function(date) {
		var view = this.view;
		var today = view.calendar.getNow().stripTime();
		var classes = [ 'fc-' + dayIDs[date.day()] ];

		if (
			view.name === 'month' &&
			date.month() != view.intervalStart.month()
		) {
			classes.push('fc-other-month');
		}

		if (date.isSame(today, 'day')) {
			classes.push(
				'fc-today',
				view.highlightStateClass
			);
		}
		else if (date < today) {
			classes.push('fc-past');
		}
		else {
			classes.push('fc-future');
		}

		return classes;
	}

});

;;

/* Event-rendering and event-interaction methods for the abstract Grid class
----------------------------------------------------------------------------------------------------------------------*/

$.extend(Grid.prototype, {

	mousedOverSeg: null, // the segment object the user's mouse is over. null if over nothing
	isDraggingSeg: false, // is a segment being dragged? boolean
	isResizingSeg: false, // is a segment being resized? boolean
	segs: null, // the event segments currently rendered in the grid


	// Renders the given events onto the grid
	renderEvents: function(events) {
		var segs = this.eventsToSegs(events);
		var bgSegs = [];
		var fgSegs = [];
		var i, seg;

		for (i = 0; i < segs.length; i++) {
			seg = segs[i];

			if (isBgEvent(seg.event)) {
				bgSegs.push(seg);
			}
			else {
				fgSegs.push(seg);
			}
		}

		// Render each different type of segment.
		// Each function may return a subset of the segs, segs that were actually rendered.
		bgSegs = this.renderBgSegs(bgSegs) || bgSegs;
		fgSegs = this.renderFgSegs(fgSegs) || fgSegs;

		this.segs = bgSegs.concat(fgSegs);
	},


	// Unrenders all events currently rendered on the grid
	destroyEvents: function() {
		this.triggerSegMouseout(); // trigger an eventMouseout if user's mouse is over an event

		this.destroyFgSegs();
		this.destroyBgSegs();

		this.segs = null;
	},


	// Retrieves all rendered segment objects currently rendered on the grid
	getSegs: function() {
		return this.segs || [];
	},


	/* Foreground Segment Rendering
	------------------------------------------------------------------------------------------------------------------*/


	// Renders foreground event segments onto the grid. May return a subset of segs that were rendered.
	renderFgSegs: function(segs) {
		// subclasses must implement
	},


	// Unrenders all currently rendered foreground segments
	destroyFgSegs: function() {
		// subclasses must implement
	},


	// Renders and assigns an `el` property for each foreground event segment.
	// Only returns segments that successfully rendered.
	// A utility that subclasses may use.
	renderFgSegEls: function(segs, disableResizing) {
		var view = this.view;
		var html = '';
		var renderedSegs = [];
		var i;

		if (segs.length) { // don't build an empty html string

			// build a large concatenation of event segment HTML
			for (i = 0; i < segs.length; i++) {
				html += this.fgSegHtml(segs[i], disableResizing);
			}

			// Grab individual elements from the combined HTML string. Use each as the default rendering.
			// Then, compute the 'el' for each segment. An el might be null if the eventRender callback returned false.
			$(html).each(function(i, node) {
				var seg = segs[i];
				var el = view.resolveEventEl(seg.event, $(node));

				if (el) {
					el.data('fc-seg', seg); // used by handlers
					seg.el = el;
					renderedSegs.push(seg);
				}
			});
		}

		return renderedSegs;
	},


	// Generates the HTML for the default rendering of a foreground event segment. Used by renderFgSegEls()
	fgSegHtml: function(seg, disableResizing) {
		// subclasses should implement
	},


	/* Background Segment Rendering
	------------------------------------------------------------------------------------------------------------------*/


	// Renders the given background event segments onto the grid.
	// Returns a subset of the segs that were actually rendered.
	renderBgSegs: function(segs) {
		return this.renderFill('bgEvent', segs);
	},


	// Unrenders all the currently rendered background event segments
	destroyBgSegs: function() {
		this.destroyFill('bgEvent');
	},


	// Renders a background event element, given the default rendering. Called by the fill system.
	bgEventSegEl: function(seg, el) {
		return this.view.resolveEventEl(seg.event, el); // will filter through eventRender
	},


	// Generates an array of classNames to be used for the default rendering of a background event.
	// Called by the fill system.
	bgEventSegClasses: function(seg) {
		var event = seg.event;
		var source = event.source || {};

		return [ 'fc-bgevent' ].concat(
			event.className,
			source.className || []
		);
	},


	// Generates a semicolon-separated CSS string to be used for the default rendering of a background event.
	// Called by the fill system.
	// TODO: consolidate with getEventSkinCss?
	bgEventSegStyles: function(seg) {
		var view = this.view;
		var event = seg.event;
		var source = event.source || {};
		var eventColor = event.color;
		var sourceColor = source.color;
		var optionColor = view.opt('eventColor');
		var backgroundColor =
			event.backgroundColor ||
			eventColor ||
			source.backgroundColor ||
			sourceColor ||
			view.opt('eventBackgroundColor') ||
			optionColor;

		if (backgroundColor) {
			return 'background-color:' + backgroundColor;
		}

		return '';
	},


	// Generates an array of classNames to be used for the rendering business hours overlay. Called by the fill system.
	businessHoursSegClasses: function(seg) {
		return [ 'fc-nonbusiness', 'fc-bgevent' ];
	},


	/* Handlers
	------------------------------------------------------------------------------------------------------------------*/


	// Attaches event-element-related handlers to the container element and leverage bubbling
	bindSegHandlers: function() {
		var _this = this;
		var view = this.view;

		$.each(
			{
				mouseenter: function(seg, ev) {
					_this.triggerSegMouseover(seg, ev);
				},
				mouseleave: function(seg, ev) {
					_this.triggerSegMouseout(seg, ev);
				},
				click: function(seg, ev) {
					return view.trigger('eventClick', this, seg.event, ev); // can return `false` to cancel
				},
				mousedown: function(seg, ev) {
					if ($(ev.target).is('.fc-resizer') && view.isEventResizable(seg.event)) {
						_this.segResizeMousedown(seg, ev);
					}
					else if (view.isEventDraggable(seg.event)) {
						_this.segDragMousedown(seg, ev);
					}
				}
			},
			function(name, func) {
				// attach the handler to the container element and only listen for real event elements via bubbling
				_this.el.on(name, '.fc-event-container > *', function(ev) {
					var seg = $(this).data('fc-seg'); // grab segment data. put there by View::renderEvents

					// only call the handlers if there is not a drag/resize in progress
					if (seg && !_this.isDraggingSeg && !_this.isResizingSeg) {
						return func.call(this, seg, ev); // `this` will be the event element
					}
				});
			}
		);
	},


	// Updates internal state and triggers handlers for when an event element is moused over
	triggerSegMouseover: function(seg, ev) {
		if (!this.mousedOverSeg) {
			this.mousedOverSeg = seg;
			this.view.trigger('eventMouseover', seg.el[0], seg.event, ev);
		}
	},


	// Updates internal state and triggers handlers for when an event element is moused out.
	// Can be given no arguments, in which case it will mouseout the segment that was previously moused over.
	triggerSegMouseout: function(seg, ev) {
		ev = ev || {}; // if given no args, make a mock mouse event

		if (this.mousedOverSeg) {
			seg = seg || this.mousedOverSeg; // if given no args, use the currently moused-over segment
			this.mousedOverSeg = null;
			this.view.trigger('eventMouseout', seg.el[0], seg.event, ev);
		}
	},


	/* Dragging
	------------------------------------------------------------------------------------------------------------------*/


	// Called when the user does a mousedown on an event, which might lead to dragging.
	// Generic enough to work with any type of Grid.
	segDragMousedown: function(seg, ev) {
		var _this = this;
		var view = this.view;
		var calendar = view.calendar;
		var el = seg.el;
		var event = seg.event;
		var newStart, newEnd;

		// A clone of the original element that will move with the mouse
		var mouseFollower = new MouseFollower(seg.el, {
			parentEl: view.el,
			opacity: view.opt('dragOpacity'),
			revertDuration: view.opt('dragRevertDuration'),
			zIndex: 2 // one above the .fc-view
		});

		// Tracks mouse movement over the *view's* coordinate map. Allows dragging and dropping between subcomponents
		// of the view.
		var dragListener = new DragListener(view.coordMap, {
			distance: 5,
			scroll: view.opt('dragScroll'),
			listenStart: function(ev) {
				mouseFollower.hide(); // don't show until we know this is a real drag
				mouseFollower.start(ev);
			},
			dragStart: function(ev) {
				_this.triggerSegMouseout(seg, ev); // ensure a mouseout on the manipulated event has been reported
				_this.isDraggingSeg = true;
				view.hideEvent(event); // hide all event segments. our mouseFollower will take over
				view.trigger('eventDragStart', el[0], event, ev, {}); // last argument is jqui dummy
			},
			cellOver: function(cell, date) {
				var origDate = seg.cellDate || dragListener.origDate;
				var res = _this.computeDraggedEventDates(seg, origDate, date);
				newStart = res.start;
				newEnd = res.end;

				if (calendar.isEventAllowedInRange(event, newStart, res.visibleEnd)) { // allowed to drop here?
					if (view.renderDrag(newStart, newEnd, seg)) { // have the view render a visual indication
						mouseFollower.hide(); // if the view is already using a mock event "helper", hide our own
					}
					else {
						mouseFollower.show();
					}
				}
				else {
					// have the helper follow the mouse (no snapping) with a warning-style cursor
					newStart = null; // mark an invalid drop date
					mouseFollower.show();
					disableCursor();
				}
			},
			cellOut: function() { // called before mouse moves to a different cell OR moved out of all cells
				newStart = null;
				view.destroyDrag(); // unrender whatever was done in view.renderDrag
				mouseFollower.show(); // show in case we are moving out of all cells
				enableCursor();
			},
			dragStop: function(ev) {
				var hasChanged = newStart && !newStart.isSame(event.start);

				// do revert animation if hasn't changed. calls a callback when finished (whether animation or not)
				mouseFollower.stop(!hasChanged, function() {
					_this.isDraggingSeg = false;
					view.destroyDrag();
					view.showEvent(event);
					view.trigger('eventDragStop', el[0], event, ev, {}); // last argument is jqui dummy

					if (hasChanged) {
						view.eventDrop(el[0], event, newStart, ev); // will rerender all events...
					}
				});

				enableCursor();
			},
			listenStop: function() {
				mouseFollower.stop(); // put in listenStop in case there was a mousedown but the drag never started
			}
		});

		dragListener.mousedown(ev); // start listening, which will eventually lead to a dragStart
	},


	// Given a segment, the dates where a drag began and ended, calculates the Event Object's new start and end dates.
	// Might return a `null` end (even when forceEventDuration is on).
	computeDraggedEventDates: function(seg, dragStartDate, dropDate) {
		var view = this.view;
		var event = seg.event;
		var start = event.start;
		var end = view.calendar.getEventEnd(event);
		var delta;
		var newStart;
		var newEnd;
		var newAllDay;
		var visibleEnd;

		if (dropDate.hasTime() === dragStartDate.hasTime()) {
			delta = dayishDiff(dropDate, dragStartDate);
			newStart = start.clone().add(delta);
			if (event.end === null) { // do we need to compute an end?
				newEnd = null;
			}
			else {
				newEnd = end.clone().add(delta);
			}
			newAllDay = event.allDay; // keep it the same
		}
		else {
			// if switching from day <-> timed, start should be reset to the dropped date, and the end cleared
			newStart = dropDate;
			newEnd = null; // end should be cleared
			newAllDay = !dropDate.hasTime();
		}

		// compute what the end date will appear to be
		visibleEnd = newEnd || view.calendar.getDefaultEventEnd(newAllDay, newStart);

		return { start: newStart, end: newEnd, visibleEnd: visibleEnd };
	},


	/* Resizing
	------------------------------------------------------------------------------------------------------------------*/


	// Called when the user does a mousedown on an event's resizer, which might lead to resizing.
	// Generic enough to work with any type of Grid.
	segResizeMousedown: function(seg, ev) {
		var _this = this;
		var view = this.view;
		var calendar = view.calendar;
		var el = seg.el;
		var event = seg.event;
		var start = event.start;
		var end = view.calendar.getEventEnd(event);
		var newEnd = null;
		var dragListener;

		function destroy() { // resets the rendering to show the original event
			_this.destroyResize();
			view.showEvent(event);
		}

		// Tracks mouse movement over the *grid's* coordinate map
		dragListener = new DragListener(this.coordMap, {
			distance: 5,
			scroll: view.opt('dragScroll'),
			dragStart: function(ev) {
				_this.triggerSegMouseout(seg, ev); // ensure a mouseout on the manipulated event has been reported
				_this.isResizingSeg = true;
				view.trigger('eventResizeStart', el[0], event, ev, {}); // last argument is jqui dummy
			},
			cellOver: function(cell, date) {
				// compute the new end. don't allow it to go before the event's start
				if (date.isBefore(start)) { // allows comparing ambig to non-ambig
					date = start;
				}
				newEnd = date.clone().add(_this.cellDuration); // make it an exclusive end

				if (calendar.isEventAllowedInRange(event, start, newEnd)) { // allowed to be resized here?
					if (newEnd.isSame(end)) {
						newEnd = null; // mark an invalid resize
						destroy();
					}
					else {
						_this.renderResize(start, newEnd, seg);
						view.hideEvent(event);
					}
				}
				else {
					newEnd = null; // mark an invalid resize
					destroy();
					disableCursor();
				}
			},
			cellOut: function() { // called before mouse moves to a different cell OR moved out of all cells
				newEnd = null;
				destroy();
				enableCursor();
			},
			dragStop: function(ev) {
				_this.isResizingSeg = false;
				destroy();
				enableCursor();
				view.trigger('eventResizeStop', el[0], event, ev, {}); // last argument is jqui dummy

				if (newEnd) {
					view.eventResize(el[0], event, newEnd, ev); // will rerender all events...
				}
			}
		});

		dragListener.mousedown(ev); // start listening, which will eventually lead to a dragStart
	},


	/* Rendering Utils
	------------------------------------------------------------------------------------------------------------------*/


	// Generic utility for generating the HTML classNames for an event segment's element
	getSegClasses: function(seg, isDraggable, isResizable) {
		var event = seg.event;
		var classes = [
			'fc-event',
			seg.isStart ? 'fc-start' : 'fc-not-start',
			seg.isEnd ? 'fc-end' : 'fc-not-end'
		].concat(
			event.className,
			event.source ? event.source.className : []
		);

		if (isDraggable) {
			classes.push('fc-draggable');
		}
		if (isResizable) {
			classes.push('fc-resizable');
		}

		return classes;
	},


	// Utility for generating a CSS string with all the event skin-related properties
	getEventSkinCss: function(event) {
		var view = this.view;
		var source = event.source || {};
		var eventColor = event.color;
		var sourceColor = source.color;
		var optionColor = view.opt('eventColor');
		var backgroundColor =
			event.backgroundColor ||
			eventColor ||
			source.backgroundColor ||
			sourceColor ||
			view.opt('eventBackgroundColor') ||
			optionColor;
		var borderColor =
			event.borderColor ||
			eventColor ||
			source.borderColor ||
			sourceColor ||
			view.opt('eventBorderColor') ||
			optionColor;
		var textColor =
			event.textColor ||
			source.textColor ||
			view.opt('eventTextColor');
		var statements = [];
		if (backgroundColor) {
			statements.push('background-color:' + backgroundColor);
		}
		if (borderColor) {
			statements.push('border-color:' + borderColor);
		}
		if (textColor) {
			statements.push('color:' + textColor);
		}
		return statements.join(';');
	},


	/* Converting events -> ranges -> segs
	------------------------------------------------------------------------------------------------------------------*/


	// Converts an array of event objects into an array of event segment objects.
	// A custom `rangeToSegsFunc` may be given for arbitrarily slicing up events.
	eventsToSegs: function(events, rangeToSegsFunc) {
		var eventRanges = this.eventsToRanges(events);
		var segs = [];
		var i;

		for (i = 0; i < eventRanges.length; i++) {
			segs.push.apply(
				segs,
				this.eventRangeToSegs(eventRanges[i], rangeToSegsFunc)
			);
		}

		return segs;
	},


	// Converts an array of events into an array of "range" objects.
	// A "range" object is a plain object with start/end properties denoting the time it covers. Also an event property.
	// For "normal" events, this will be identical to the event's start/end, but for "inverse-background" events,
	// will create an array of ranges that span the time *not* covered by the given event.
	eventsToRanges: function(events) {
		var _this = this;
		var eventsById = groupEventsById(events);
		var ranges = [];

		// group by ID so that related inverse-background events can be rendered together
		$.each(eventsById, function(id, eventGroup) {
			if (eventGroup.length) {
				ranges.push.apply(
					ranges,
					isInverseBgEvent(eventGroup[0]) ?
						_this.eventsToInverseRanges(eventGroup) :
						_this.eventsToNormalRanges(eventGroup)
				);
			}
		});

		return ranges;
	},


	// Converts an array of "normal" events (not inverted rendering) into a parallel array of ranges
	eventsToNormalRanges: function(events) {
		var calendar = this.view.calendar;
		var ranges = [];
		var i, event;
		var eventStart, eventEnd;

		for (i = 0; i < events.length; i++) {
			event = events[i];

			// make copies and normalize by stripping timezone
			eventStart = event.start.clone().stripZone();
			eventEnd = calendar.getEventEnd(event).stripZone();

			ranges.push({
				event: event,
				start: eventStart,
				end: eventEnd,
				eventStartMS: +eventStart,
				eventDurationMS: eventEnd - eventStart
			});
		}

		return ranges;
	},


	// Converts an array of events, with inverse-background rendering, into an array of range objects.
	// The range objects will cover all the time NOT covered by the events.
	eventsToInverseRanges: function(events) {
		var view = this.view;
		var viewStart = view.start.clone().stripZone(); // normalize timezone
		var viewEnd = view.end.clone().stripZone(); // normalize timezone
		var normalRanges = this.eventsToNormalRanges(events); // will give us normalized dates we can use w/o copies
		var inverseRanges = [];
		var event0 = events[0]; // assign this to each range's `.event`
		var start = viewStart; // the end of the previous range. the start of the new range
		var i, normalRange;

		// ranges need to be in order. required for our date-walking algorithm
		normalRanges.sort(compareNormalRanges);

		for (i = 0; i < normalRanges.length; i++) {
			normalRange = normalRanges[i];

			// add the span of time before the event (if there is any)
			if (normalRange.start > start) { // compare millisecond time (skip any ambig logic)
				inverseRanges.push({
					event: event0,
					start: start,
					end: normalRange.start
				});
			}

			start = normalRange.end;
		}

		// add the span of time after the last event (if there is any)
		if (start < viewEnd) { // compare millisecond time (skip any ambig logic)
			inverseRanges.push({
				event: event0,
				start: start,
				end: viewEnd
			});
		}

		return inverseRanges;
	},


	// Slices the given event range into one or more segment objects.
	// A `rangeToSegsFunc` custom slicing function can be given.
	eventRangeToSegs: function(eventRange, rangeToSegsFunc) {
		var segs;
		var i, seg;

		if (rangeToSegsFunc) {
			segs = rangeToSegsFunc(eventRange.start, eventRange.end);
		}
		else {
			segs = this.rangeToSegs(eventRange.start, eventRange.end); // defined by the subclass
		}

		for (i = 0; i < segs.length; i++) {
			seg = segs[i];
			seg.event = eventRange.event;
			seg.eventStartMS = eventRange.eventStartMS;
			seg.eventDurationMS = eventRange.eventDurationMS;
		}

		return segs;
	}

});


/* Utilities
----------------------------------------------------------------------------------------------------------------------*/


function isBgEvent(event) { // returns true if background OR inverse-background
	var rendering = getEventRendering(event);
	return rendering === 'background' || rendering === 'inverse-background';
}


function isInverseBgEvent(event) {
	return getEventRendering(event) === 'inverse-background';
}


function getEventRendering(event) {
	return firstDefined((event.source || {}).rendering, event.rendering);
}


function groupEventsById(events) {
	var eventsById = {};
	var i, event;

	for (i = 0; i < events.length; i++) {
		event = events[i];
		(eventsById[event._id] || (eventsById[event._id] = [])).push(event);
	}

	return eventsById;
}


// A cmp function for determining which non-inverted "ranges" (see above) happen earlier
function compareNormalRanges(range1, range2) {
	return range1.eventStartMS - range2.eventStartMS; // earlier ranges go first
}


// A cmp function for determining which segments should take visual priority
// DOES NOT WORK ON INVERTED BACKGROUND EVENTS because they have no eventStartMS/eventDurationMS
function compareSegs(seg1, seg2) {
	return seg1.eventStartMS - seg2.eventStartMS || // earlier events go first
		seg2.eventDurationMS - seg1.eventDurationMS || // tie? longer events go first
		seg2.event.allDay - seg1.event.allDay || // tie? put all-day events first (booleans cast to 0/1)
		(seg1.event.title || '').localeCompare(seg2.event.title); // tie? alphabetically by title
}


;;

/* A component that renders a grid of whole-days that runs horizontally. There can be multiple rows, one per week.
----------------------------------------------------------------------------------------------------------------------*/

function DayGrid(view) {
	Grid.call(this, view); // call the super-constructor
}


DayGrid.prototype = createObject(Grid.prototype); // declare the super-class
$.extend(DayGrid.prototype, {

	numbersVisible: false, // should render a row for day/week numbers? manually set by the view
	cellDuration: moment.duration({ days: 1 }), // required for Grid.event.js. Each cell is always a single day
	bottomCoordPadding: 0, // hack for extending the hit area for the last row of the coordinate grid

	rowEls: null, // set of fake row elements
	dayEls: null, // set of whole-day elements comprising the row's background
	helperEls: null, // set of cell skeleton elements for rendering the mock event "helper"


	// Renders the rows and columns into the component's `this.el`, which should already be assigned.
	// isRigid determins whether the individual rows should ignore the contents and be a constant height.
	// Relies on the view's colCnt and rowCnt. In the future, this component should probably be self-sufficient.
	render: function(isRigid) {
		var view = this.view;
		var html = '';
		var row;

		for (row = 0; row < view.rowCnt; row++) {
			html += this.dayRowHtml(row, isRigid);
		}
		this.el.html(html);

		this.rowEls = this.el.find('.fc-row');
		this.dayEls = this.el.find('.fc-day');

		// run all the day cells through the dayRender callback
		this.dayEls.each(function(i, node) {
			var date = view.cellToDate(Math.floor(i / view.colCnt), i % view.colCnt);
			view.trigger('dayRender', null, date, $(node));
		});

		Grid.prototype.render.call(this); // call the super-method
	},


	destroy: function() {
		this.destroySegPopover();
	},


	// Generates the HTML for a single row. `row` is the row number.
	dayRowHtml: function(row, isRigid) {
		var view = this.view;
		var classes = [ 'fc-row', 'fc-week', view.widgetContentClass ];

		if (isRigid) {
			classes.push('fc-rigid');
		}

		return '' +
			'<div class="' + classes.join(' ') + '">' +
				'<div class="fc-bg">' +
					'<table>' +
						this.rowHtml('day', row) + // leverages RowRenderer. calls dayCellHtml()
					'</table>' +
				'</div>' +
				'<div class="fc-content-skeleton">' +
					'<table>' +
						(this.numbersVisible ?
							'<thead>' +
								this.rowHtml('number', row) + // leverages RowRenderer. View will define render method
							'</thead>' :
							''
							) +
					'</table>' +
				'</div>' +
			'</div>';
	},


	// Renders the HTML for a whole-day cell. Will eventually end up in the day-row's background.
	// We go through a 'day' row type instead of just doing a 'bg' row type so that the View can do custom rendering
	// specifically for whole-day rows, whereas a 'bg' might also be used for other purposes (TimeGrid bg for example).
	dayCellHtml: function(row, col, date) {
		return this.bgCellHtml(row, col, date);
	},


	/* Coordinates & Cells
	------------------------------------------------------------------------------------------------------------------*/


	// Populates the empty `rows` and `cols` arrays with coordinates of the cells. For CoordGrid.
	buildCoords: function(rows, cols) {
		var colCnt = this.view.colCnt;
		var e, n, p;

		this.dayEls.slice(0, colCnt).each(function(i, _e) { // iterate the first row of day elements
			e = $(_e);
			n = e.offset().left;
			if (i) {
				p[1] = n;
			}
			p = [ n ];
			cols[i] = p;
		});
		p[1] = n + e.outerWidth();

		this.rowEls.each(function(i, _e) {
			e = $(_e);
			n = e.offset().top;
			if (i) {
				p[1] = n;
			}
			p = [ n ];
			rows[i] = p;
		});
		p[1] = n + e.outerHeight() + this.bottomCoordPadding; // hack to extend hit area of last row
	},


	// Converts a cell to a date
	getCellDate: function(cell) {
		return this.view.cellToDate(cell); // leverages the View's cell system
	},


	// Gets the whole-day element associated with the cell
	getCellDayEl: function(cell) {
		return this.dayEls.eq(cell.row * this.view.colCnt + cell.col);
	},


	// Converts a range with an inclusive `start` and an exclusive `end` into an array of segment objects
	rangeToSegs: function(start, end) {
		return this.view.rangeToSegments(start, end); // leverages the View's cell system
	},


	/* Event Drag Visualization
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of an event hovering over the given date(s).
	// `end` can be null, as well as `seg`. See View's documentation on renderDrag for more info.
	// A returned value of `true` signals that a mock "helper" event has been rendered.
	renderDrag: function(start, end, seg) {
		var opacity;

		// always render a highlight underneath
		this.renderHighlight(
			start,
			end || this.view.calendar.getDefaultEventEnd(true, start)
		);

		// if a segment from the same calendar but another component is being dragged, render a helper event
		if (seg && !seg.el.closest(this.el).length) {

			this.renderRangeHelper(start, end, seg);

			opacity = this.view.opt('dragOpacity');
			if (opacity !== undefined) {
				this.helperEls.css('opacity', opacity);
			}

			return true; // a helper has been rendered
		}
	},


	// Unrenders any visual indication of a hovering event
	destroyDrag: function() {
		this.destroyHighlight();
		this.destroyHelper();
	},


	/* Event Resize Visualization
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of an event being resized
	renderResize: function(start, end, seg) {
		this.renderHighlight(start, end);
		this.renderRangeHelper(start, end, seg);
	},


	// Unrenders a visual indication of an event being resized
	destroyResize: function() {
		this.destroyHighlight();
		this.destroyHelper();
	},


	/* Event Helper
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a mock "helper" event. `sourceSeg` is the associated internal segment object. It can be null.
	renderHelper: function(event, sourceSeg) {
		var helperNodes = [];
		var segs = this.eventsToSegs([ event ]);
		var rowStructs;

		segs = this.renderFgSegEls(segs); // assigns each seg's el and returns a subset of segs that were rendered
		rowStructs = this.renderSegRows(segs);

		// inject each new event skeleton into each associated row
		this.rowEls.each(function(row, rowNode) {
			var rowEl = $(rowNode); // the .fc-row
			var skeletonEl = $('<div class="fc-helper-skeleton"><table/></div>'); // will be absolutely positioned
			var skeletonTop;

			// If there is an original segment, match the top position. Otherwise, put it at the row's top level
			if (sourceSeg && sourceSeg.row === row) {
				skeletonTop = sourceSeg.el.position().top;
			}
			else {
				skeletonTop = rowEl.find('.fc-content-skeleton tbody').position().top;
			}

			skeletonEl.css('top', skeletonTop)
				.find('table')
					.append(rowStructs[row].tbodyEl);

			rowEl.append(skeletonEl);
			helperNodes.push(skeletonEl[0]);
		});

		this.helperEls = $(helperNodes); // array -> jQuery set
	},


	// Unrenders any visual indication of a mock helper event
	destroyHelper: function() {
		if (this.helperEls) {
			this.helperEls.remove();
			this.helperEls = null;
		}
	},


	/* Fill System (highlight, background events, business hours)
	------------------------------------------------------------------------------------------------------------------*/


	fillSegTag: 'td', // override the default tag name


	// Renders a set of rectangles over the given segments of days.
	// Only returns segments that successfully rendered.
	renderFill: function(type, segs) {
		var nodes = [];
		var i, seg;
		var skeletonEl;

		segs = this.renderFillSegEls(type, segs); // assignes `.el` to each seg. returns successfully rendered segs

		for (i = 0; i < segs.length; i++) {
			seg = segs[i];
			skeletonEl = this.renderFillRow(type, seg);
			this.rowEls.eq(seg.row).append(skeletonEl);
			nodes.push(skeletonEl[0]);
		}

		this.elsByFill[type] = $(nodes);

		return segs;
	},


	// Generates the HTML needed for one row of a fill. Requires the seg's el to be rendered.
	renderFillRow: function(type, seg) {
		var colCnt = this.view.colCnt;
		var startCol = seg.leftCol;
		var endCol = seg.rightCol + 1;
		var skeletonEl;
		var trEl;

		skeletonEl = $(
			'<div class="fc-' + type.toLowerCase() + '-skeleton">' +
				'<table><tr/></table>' +
			'</div>'
		);
		trEl = skeletonEl.find('tr');

		if (startCol > 0) {
			trEl.append('<td colspan="' + startCol + '"/>');
		}

		trEl.append(
			seg.el.attr('colspan', endCol - startCol)
		);

		if (endCol < colCnt) {
			trEl.append('<td colspan="' + (colCnt - endCol) + '"/>');
		}

		this.bookendCells(trEl, type);

		return skeletonEl;
	}

});

;;

/* Event-rendering methods for the DayGrid class
----------------------------------------------------------------------------------------------------------------------*/

$.extend(DayGrid.prototype, {

	rowStructs: null, // an array of objects, each holding information about a row's foreground event-rendering


	// Unrenders all events currently rendered on the grid
	destroyEvents: function() {
		this.destroySegPopover(); // removes the "more.." events popover
		Grid.prototype.destroyEvents.apply(this, arguments); // calls the super-method
	},


	// Retrieves all rendered segment objects currently rendered on the grid
	getSegs: function() {
		return Grid.prototype.getSegs.call(this) // get the segments from the super-method
			.concat(this.popoverSegs || []); // append the segments from the "more..." popover
	},


	// Renders the given background event segments onto the grid
	renderBgSegs: function(segs) {

		// don't render timed background events
		var allDaySegs = $.grep(segs, function(seg) {
			return seg.event.allDay;
		});

		return Grid.prototype.renderBgSegs.call(this, allDaySegs); // call the super-method
	},


	// Renders the given foreground event segments onto the grid
	renderFgSegs: function(segs) {
		var rowStructs;

		// render an `.el` on each seg
		// returns a subset of the segs. segs that were actually rendered
		segs = this.renderFgSegEls(segs);

		rowStructs = this.rowStructs = this.renderSegRows(segs);

		// append to each row's content skeleton
		this.rowEls.each(function(i, rowNode) {
			$(rowNode).find('.fc-content-skeleton > table').append(
				rowStructs[i].tbodyEl
			);
		});

		return segs; // return only the segs that were actually rendered
	},


	// Unrenders all currently rendered foreground event segments
	destroyFgSegs: function() {
		var rowStructs = this.rowStructs || [];
		var rowStruct;

		while ((rowStruct = rowStructs.pop())) {
			rowStruct.tbodyEl.remove();
		}

		this.rowStructs = null;
	},


	// Uses the given events array to generate <tbody> elements that should be appended to each row's content skeleton.
	// Returns an array of rowStruct objects (see the bottom of `renderSegRow`).
	// PRECONDITION: each segment shoud already have a rendered and assigned `.el`
	renderSegRows: function(segs) {
		var rowStructs = [];
		var segRows;
		var row;

		segRows = this.groupSegRows(segs); // group into nested arrays

		// iterate each row of segment groupings
		for (row = 0; row < segRows.length; row++) {
			rowStructs.push(
				this.renderSegRow(row, segRows[row])
			);
		}

		return rowStructs;
	},


	// Builds the HTML to be used for the default element for an individual segment
	fgSegHtml: function(seg, disableResizing) {
		var view = this.view;
		var isRTL = view.opt('isRTL');
		var event = seg.event;
		var isDraggable = view.isEventDraggable(event);
		var isResizable = !disableResizing && event.allDay && seg.isEnd && view.isEventResizable(event);
		var classes = this.getSegClasses(seg, isDraggable, isResizable);
		var skinCss = this.getEventSkinCss(event);
		var timeHtml = '';
		var titleHtml;

		classes.unshift('fc-day-grid-event');

		// Only display a timed events time if it is the starting segment
		if (!event.allDay && seg.isStart) {
			timeHtml = '<span class="fc-time">' + htmlEscape(view.getEventTimeText(event)) + '</span>';
		}

		titleHtml =
			'<span class="fc-title">' +
				(htmlEscape(event.title || '') || '&nbsp;') + // we always want one line of height
			'</span>';
		
		return '<a class="' + classes.join(' ') + '"' +
				(event.url ?
					' href="' + htmlEscape(event.url) + '"' :
					''
					) +
				(skinCss ?
					' style="' + skinCss + '"' :
					''
					) +
			'>' +
				'<div class="fc-content">' +
					(isRTL ?
						titleHtml + ' ' + timeHtml : // put a natural space in between
						timeHtml + ' ' + titleHtml   //
						) +
				'</div>' +
				(isResizable ?
					'<div class="fc-resizer"/>' :
					''
					) +
			'</a>';
	},


	// Given a row # and an array of segments all in the same row, render a <tbody> element, a skeleton that contains
	// the segments. Returns object with a bunch of internal data about how the render was calculated.
	renderSegRow: function(row, rowSegs) {
		var view = this.view;
		var colCnt = view.colCnt;
		var segLevels = this.buildSegLevels(rowSegs); // group into sub-arrays of levels
		var levelCnt = Math.max(1, segLevels.length); // ensure at least one level
		var tbody = $('<tbody/>');
		var segMatrix = []; // lookup for which segments are rendered into which level+col cells
		var cellMatrix = []; // lookup for all <td> elements of the level+col matrix
		var loneCellMatrix = []; // lookup for <td> elements that only take up a single column
		var i, levelSegs;
		var col;
		var tr;
		var j, seg;
		var td;

		// populates empty cells from the current column (`col`) to `endCol`
		function emptyCellsUntil(endCol) {
			while (col < endCol) {
				// try to grab a cell from the level above and extend its rowspan. otherwise, create a fresh cell
				td = (loneCellMatrix[i - 1] || [])[col];
				if (td) {
					td.attr(
						'rowspan',
						parseInt(td.attr('rowspan') || 1, 10) + 1
					);
				}
				else {
					td = $('<td/>');
					tr.append(td);
				}
				cellMatrix[i][col] = td;
				loneCellMatrix[i][col] = td;
				col++;
			}
		}

		for (i = 0; i < levelCnt; i++) { // iterate through all levels
			levelSegs = segLevels[i];
			col = 0;
			tr = $('<tr/>');

			segMatrix.push([]);
			cellMatrix.push([]);
			loneCellMatrix.push([]);

			// levelCnt might be 1 even though there are no actual levels. protect against this.
			// this single empty row is useful for styling.
			if (levelSegs) {
				for (j = 0; j < levelSegs.length; j++) { // iterate through segments in level
					seg = levelSegs[j];

					emptyCellsUntil(seg.leftCol);

					// create a container that occupies or more columns. append the event element.
					td = $('<td class="fc-event-container"/>').append(seg.el);
					if (seg.leftCol != seg.rightCol) {
						td.attr('colspan', seg.rightCol - seg.leftCol + 1);
					}
					else { // a single-column segment
						loneCellMatrix[i][col] = td;
					}

					while (col <= seg.rightCol) {
						cellMatrix[i][col] = td;
						segMatrix[i][col] = seg;
						col++;
					}

					tr.append(td);
				}
			}

			emptyCellsUntil(colCnt); // finish off the row
			this.bookendCells(tr, 'eventSkeleton');
			tbody.append(tr);
		}

		return { // a "rowStruct"
			row: row, // the row number
			tbodyEl: tbody,
			cellMatrix: cellMatrix,
			segMatrix: segMatrix,
			segLevels: segLevels,
			segs: rowSegs
		};
	},


	// Stacks a flat array of segments, which are all assumed to be in the same row, into subarrays of vertical levels.
	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.
		segs.sort(compareSegs);
		
		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 view = this.view;
		var segRows = [];
		var i;

		for (i = 0; i < view.rowCnt; i++) {
			segRows.push([]);
		}

		for (i = 0; i < segs.length; i++) {
			segRows[segs[i].row].push(segs[i]);
		}

		return segRows;
	}

});


// Computes whether two segments' columns collide. They are assumed to be in the same row.
function isDaySegCollision(seg, otherSegs) {
	var i, otherSeg;

	for (i = 0; i < otherSegs.length; i++) {
		otherSeg = otherSegs[i];

		if (
			otherSeg.leftCol <= seg.rightCol &&
			otherSeg.rightCol >= seg.leftCol
		) {
			return true;
		}
	}

	return false;
}


// A cmp function for determining the leftmost event
function compareDaySegCols(a, b) {
	return a.leftCol - b.leftCol;
}

;;

/* Methods relate to limiting the number events for a given day on a DayGrid
----------------------------------------------------------------------------------------------------------------------*/
// NOTE: all the segs being passed around in here are foreground segs

$.extend(DayGrid.prototype, {


	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


	destroySegPopover: function() {
		if (this.segPopover) {
			this.segPopover.hide(); // will trigger destruction of `segPopover` and `popoverSegs`
		}
	},


	// Limits the number of "levels" (vertically stacking layers of events) for each row of the grid.
	// `levelLimit` can be false (don't limit), a number, or true (should be computed).
	limitRows: function(levelLimit) {
		var rowStructs = this.rowStructs || [];
		var row; // row #
		var rowLevelLimit;

		for (row = 0; row < rowStructs.length; row++) {
			this.unlimitRow(row);

			if (!levelLimit) {
				rowLevelLimit = false;
			}
			else if (typeof levelLimit === 'number') {
				rowLevelLimit = levelLimit;
			}
			else {
				rowLevelLimit = this.computeRowLevelLimit(row);
			}

			if (rowLevelLimit !== false) {
				this.limitRow(row, rowLevelLimit);
			}
		}
	},


	// Computes the number of levels a row will accomodate without going outside its bounds.
	// Assumes the row is "rigid" (maintains a constant height regardless of what is inside).
	// `row` is the row number.
	computeRowLevelLimit: function(row) {
		var rowEl = this.rowEls.eq(row); // the containing "fake" row div
		var rowHeight = rowEl.height(); // TODO: cache somehow?
		var trEls = this.rowStructs[row].tbodyEl.children();
		var i, trEl;

		// 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'); // get and reveal
			if (trEl.position().top + trEl.outerHeight() > 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 view = this.view;
		var rowStruct = this.rowStructs[row];
		var moreNodes = []; // array of "more" <a> links and <td> DOM nodes
		var col = 0; // col #
		var cell;
		var levelSegs; // array of segment objects in the last allowable level, ordered left-to-right
		var cellMatrix; // a matrix (by level, then column) of all <td> jQuery elements in the row
		var limitedNodes; // array of temporarily hidden level <tr> and segment <td> DOM nodes
		var i, seg;
		var segsBelow; // array of segment objects below `seg` in the current `col`
		var totalSegsBelow; // total number of segments below `seg` in any of the columns `seg` occupies
		var colSegsBelow; // array of segment arrays, below seg, one for each column (offset from segs's first column)
		var td, rowspan;
		var segMoreNodes; // array of "more" <td> cells that will stand-in for the current seg's cell
		var j;
		var moreTd, moreWrap, moreLink;

		// Iterates through empty level cells and places "more" links inside if need be
		function emptyCellsUntil(endCol) { // goes from current `col` to `endCol`
			while (col < endCol) {
				cell = { row: row, col: col };
				segsBelow = _this.getCellSegs(cell, levelLimit);
				if (segsBelow.length) {
					td = cellMatrix[levelLimit - 1][col];
					moreLink = _this.renderMoreLink(cell, segsBelow);
					moreWrap = $('<div/>').append(moreLink);
					td.append(moreWrap);
					moreNodes.push(moreWrap[0]);
				}
				col++;
			}
		}

		if (levelLimit && levelLimit < rowStruct.segLevels.length) { // is it actually over the limit?
			levelSegs = rowStruct.segLevels[levelLimit - 1];
			cellMatrix = rowStruct.cellMatrix;

			limitedNodes = rowStruct.tbodyEl.children().slice(levelLimit) // get level <tr> elements past the limit
				.addClass('fc-limited').get(); // hide elements and get a simple DOM-nodes array

			// iterate though segments in the last allowable level
			for (i = 0; i < levelSegs.length; i++) {
				seg = levelSegs[i];
				emptyCellsUntil(seg.leftCol); // process empty cells before the segment

				// determine *all* segments below `seg` that occupy the same columns
				colSegsBelow = [];
				totalSegsBelow = 0;
				while (col <= seg.rightCol) {
					cell = { row: row, col: col };
					segsBelow = this.getCellSegs(cell, levelLimit);
					colSegsBelow.push(segsBelow);
					totalSegsBelow += segsBelow.length;
					col++;
				}

				if (totalSegsBelow) { // do we need to replace this segment with one or many "more" links?
					td = cellMatrix[levelLimit - 1][seg.leftCol]; // the segment's parent cell
					rowspan = td.attr('rowspan') || 1;
					segMoreNodes = [];

					// make a replacement <td> for each column the segment occupies. will be one for each colspan
					for (j = 0; j < colSegsBelow.length; j++) {
						moreTd = $('<td class="fc-more-cell"/>').attr('rowspan', rowspan);
						segsBelow = colSegsBelow[j];
						cell = { row: row, col: seg.leftCol + j };
						moreLink = this.renderMoreLink(cell, [ seg ].concat(segsBelow)); // count seg as hidden too
						moreWrap = $('<div/>').append(moreLink);
						moreTd.append(moreWrap);
						segMoreNodes.push(moreTd[0]);
						moreNodes.push(moreTd[0]);
					}

					td.addClass('fc-limited').after($(segMoreNodes)); // hide original <td> and inject replacements
					limitedNodes.push(td[0]);
				}
			}

			emptyCellsUntil(view.colCnt); // finish off the level
			rowStruct.moreEls = $(moreNodes); // for easy undoing later
			rowStruct.limitedEls = $(limitedNodes); // for easy undoing later
		}
	},


	// Reveals all levels and removes all "more"-related elements for a grid's row.
	// `row` is a row number.
	unlimitRow: function(row) {
		var rowStruct = this.rowStructs[row];

		if (rowStruct.moreEls) {
			rowStruct.moreEls.remove();
			rowStruct.moreEls = null;
		}

		if (rowStruct.limitedEls) {
			rowStruct.limitedEls.removeClass('fc-limited');
			rowStruct.limitedEls = null;
		}
	},


	// Renders an <a> element that represents hidden event element for a cell.
	// Responsible for attaching click handler as well.
	renderMoreLink: function(cell, hiddenSegs) {
		var _this = this;
		var view = this.view;

		return $('<a class="fc-more"/>')
			.text(
				this.getMoreLinkText(hiddenSegs.length)
			)
			.on('click', function(ev) {
				var clickOption = view.opt('eventLimitClick');
				var date = view.cellToDate(cell);
				var moreEl = $(this);
				var dayEl = _this.getCellDayEl(cell);
				var allSegs = _this.getCellSegs(cell);

				// rescope the segments to be within the cell's date
				var reslicedAllSegs = _this.resliceDaySegs(allSegs, date);
				var reslicedHiddenSegs = _this.resliceDaySegs(hiddenSegs, date);

				if (typeof clickOption === 'function') {
					// the returned value can be an atomic option
					clickOption = view.trigger('eventLimitClick', null, {
						date: date,
						dayEl: dayEl,
						moreEl: moreEl,
						segs: reslicedAllSegs,
						hiddenSegs: reslicedHiddenSegs
					}, ev);
				}

				if (clickOption === 'popover') {
					_this.showSegPopover(date, cell, moreEl, reslicedAllSegs);
				}
				else if (typeof clickOption === 'string') { // a view name
					view.calendar.zoomTo(date, clickOption);
				}
			});
	},


	// Reveals the popover that displays all events within a cell
	showSegPopover: function(date, cell, moreLink, segs) {
		var _this = this;
		var view = this.view;
		var moreWrap = moreLink.parent(); // the <div> wrapper around the <a>
		var topEl; // the element we want to match the top coordinate of
		var options;

		if (view.rowCnt == 1) {
			topEl = this.view.el; // will cause the popover to cover any sort of header
		}
		else {
			topEl = this.rowEls.eq(cell.row); // will align with top of row
		}

		options = {
			className: 'fc-more-popover',
			content: this.renderSegPopoverContent(date, segs),
			parentEl: this.el,
			top: topEl.offset().top,
			autoHide: true, // when the user clicks elsewhere, hide the popover
			viewportConstrain: view.opt('popoverViewportConstrain'),
			hide: function() {
				// destroy everything when the popover is hidden
				_this.segPopover.destroy();
				_this.segPopover = null;
				_this.popoverSegs = null;
			}
		};

		// Determine horizontal coordinate.
		// We use the moreWrap instead of the <td> to avoid border confusion.
		if (view.opt('isRTL')) {
			options.right = moreWrap.offset().left + moreWrap.outerWidth() + 1; // +1 to be over cell border
		}
		else {
			options.left = moreWrap.offset().left - 1; // -1 to be over cell border
		}

		this.segPopover = new Popover(options);
		this.segPopover.show();
	},


	// Builds the inner DOM contents of the segment popover
	renderSegPopoverContent: function(date, segs) {
		var view = this.view;
		var isTheme = view.opt('theme');
		var title = date.format(view.opt('dayPopoverFormat'));
		var content = $(
			'<div class="fc-header ' + view.widgetHeaderClass + '">' +
				'<span class="fc-close ' +
					(isTheme ? 'ui-icon ui-icon-closethick' : 'fc-icon fc-icon-x') +
				'"></span>' +
				'<span class="fc-title">' +
					htmlEscape(title) +
				'</span>' +
				'<div class="fc-clear"/>' +
			'</div>' +
			'<div class="fc-body ' + view.widgetContentClass + '">' +
				'<div class="fc-event-container"></div>' +
			'</div>'
		);
		var segContainer = content.find('.fc-event-container');
		var i;

		// render each seg's `el` and only return the visible segs
		segs = this.renderFgSegEls(segs, true); // disableResizing=true
		this.popoverSegs = segs;

		for (i = 0; i < segs.length; i++) {

			// because segments in the popover are not part of a grid coordinate system, provide a hint to any
			// grids that want to do drag-n-drop about which cell it came from
			segs[i].cellDate = date;

			segContainer.append(segs[i].el);
		}

		return content;
	},


	// Given the events within an array of segment objects, reslice them to be in a single day
	resliceDaySegs: function(segs, dayDate) {

		// build an array of the original events
		var events = $.map(segs, function(seg) {
			return seg.event;
		});

		var dayStart = dayDate.clone().stripTime();
		var dayEnd = dayStart.clone().add(1, 'days');

		// slice the events with a custom slicing function
		return this.eventsToSegs(
			events,
			function(rangeStart, rangeEnd) {
				var seg = intersectionToSeg(rangeStart, rangeEnd, dayStart, dayEnd); // if no intersection, undefined
				return seg ? [ seg ] : []; // must return an array of segments
			}
		);
	},


	// Generates the text that should be inside a "more" link, given the number of events it represents
	getMoreLinkText: function(num) {
		var view = this.view;
		var opt = view.opt('eventLimitText');

		if (typeof opt === 'function') {
			return opt(num);
		}
		else {
			return '+' + num + ' ' + opt;
		}
	},


	// Returns segments within a given cell.
	// If `startLevel` is specified, returns only events including and below that level. Otherwise returns all segs.
	getCellSegs: function(cell, startLevel) {
		var segMatrix = this.rowStructs[cell.row].segMatrix;
		var level = startLevel || 0;
		var segs = [];
		var seg;

		while (level < segMatrix.length) {
			seg = segMatrix[level][cell.col];
			if (seg) {
				segs.push(seg);
			}
			level++;
		}

		return segs;
	}

});

;;

/* A component that renders one or more columns of vertical time slots
----------------------------------------------------------------------------------------------------------------------*/

function TimeGrid(view) {
	Grid.call(this, view); // call the super-constructor
}


TimeGrid.prototype = createObject(Grid.prototype); // define the super-class
$.extend(TimeGrid.prototype, {

	slotDuration: null, // duration of a "slot", a distinct time segment on given day, visualized by lines
	snapDuration: null, // granularity of time for dragging and selecting

	minTime: null, // Duration object that denotes the first visible time of any given day
	maxTime: null, // Duration object that denotes the exclusive visible end time of any given day

	dayEls: null, // cells elements in the day-row background
	slatEls: null, // elements running horizontally across all columns

	slatTops: null, // an array of top positions, relative to the container. last item holds bottom of last slot

	helperEl: null, // cell skeleton element for rendering the mock event "helper"

	businessHourSegs: null,


	// Renders the time grid into `this.el`, which should already be assigned.
	// Relies on the view's colCnt. In the future, this component should probably be self-sufficient.
	render: function() {
		this.processOptions();

		this.el.html(this.renderHtml());

		this.dayEls = this.el.find('.fc-day');
		this.slatEls = this.el.find('.fc-slats tr');

		this.computeSlatTops();

		this.renderBusinessHours();

		Grid.prototype.render.call(this); // call the super-method
	},


	renderBusinessHours: function() {
		var events = this.view.calendar.getBusinessHoursEvents();
		this.businessHourSegs = this.renderFill('businessHours', this.eventsToSegs(events), 'bgevent');
	},


	// Renders the basic HTML skeleton for the grid
	renderHtml: function() {
		return '' +
			'<div class="fc-bg">' +
				'<table>' +
					this.rowHtml('slotBg') + // leverages RowRenderer, which will call slotBgCellHtml
				'</table>' +
			'</div>' +
			'<div class="fc-slats">' +
				'<table>' +
					this.slatRowHtml() +
				'</table>' +
			'</div>';
	},


	// Renders the HTML for a vertical background cell behind the slots.
	// This method is distinct from 'bg' because we wanted a new `rowType` so the View could customize the rendering.
	slotBgCellHtml: function(row, col, date) {
		return this.bgCellHtml(row, col, date);
	},


	// Generates the HTML for the horizontal "slats" that run width-wise. Has a time axis on a side. Depends on RTL.
	slatRowHtml: function() {
		var view = this.view;
		var calendar = view.calendar;
		var isRTL = view.opt('isRTL');
		var html = '';
		var slotNormal = this.slotDuration.asMinutes() % 15 === 0;
		var slotTime = moment.duration(+this.minTime); // wish there was .clone() for durations
		var slotDate; // will be on the view's first day, but we only care about its time
		var minutes;
		var axisHtml;

		// Calculate the time for each slot
		while (slotTime < this.maxTime) {
			slotDate = view.start.clone().time(slotTime); // will be in UTC but that's good. to avoid DST issues
			minutes = slotDate.minutes();

			axisHtml =
				'<td class="fc-axis fc-time ' + view.widgetContentClass + '" ' + view.axisStyleAttr() + '>' +
					((!slotNormal || !minutes) ? // if irregular slot duration, or on the hour, then display the time
						'<span>' + // for matchCellWidths
							htmlEscape(calendar.formatDate(slotDate, view.opt('axisFormat'))) +
						'</span>' :
						''
						) +
				'</td>';

			html +=
				'<tr ' + (!minutes ? '' : 'class="fc-minor"') + '>' +
					(!isRTL ? axisHtml : '') +
					'<td class="' + view.widgetContentClass + '"/>' +
					(isRTL ? axisHtml : '') +
				"</tr>";

			slotTime.add(this.slotDuration);
		}

		return html;
	},


	// Parses various options into properties of this object
	processOptions: function() {
		var view = this.view;
		var slotDuration = view.opt('slotDuration');
		var snapDuration = view.opt('snapDuration');

		slotDuration = moment.duration(slotDuration);
		snapDuration = snapDuration ? moment.duration(snapDuration) : slotDuration;

		this.slotDuration = slotDuration;
		this.snapDuration = snapDuration;
		this.cellDuration = snapDuration; // important to assign this for Grid.events.js

		this.minTime = moment.duration(view.opt('minTime'));
		this.maxTime = moment.duration(view.opt('maxTime'));
	},


	// Slices up a date range into a segment for each column
	rangeToSegs: function(rangeStart, rangeEnd) {
		var view = this.view;
		var segs = [];
		var seg;
		var col;
		var cellDate;
		var colStart, colEnd;

		// normalize
		rangeStart = rangeStart.clone().stripZone();
		rangeEnd = rangeEnd.clone().stripZone();

		for (col = 0; col < view.colCnt; col++) {
			cellDate = view.cellToDate(0, col); // use the View's cell system for this
			colStart = cellDate.clone().time(this.minTime);
			colEnd = cellDate.clone().time(this.maxTime);
			seg = intersectionToSeg(rangeStart, rangeEnd, colStart, colEnd);
			if (seg) {
				seg.col = col;
				segs.push(seg);
			}
		}

		return segs;
	},


	/* Coordinates
	------------------------------------------------------------------------------------------------------------------*/


	// Called when there is a window resize/zoom and we need to recalculate coordinates for the grid
	resize: function() {
		this.computeSlatTops();
		this.updateSegVerticals();
	},


	// Populates the given empty `rows` and `cols` arrays with offset positions of the "snap" cells.
	// "Snap" cells are different the slots because they might have finer granularity.
	buildCoords: function(rows, cols) {
		var colCnt = this.view.colCnt;
		var originTop = this.el.offset().top;
		var snapTime = moment.duration(+this.minTime);
		var p = null;
		var e, n;

		this.dayEls.slice(0, colCnt).each(function(i, _e) {
			e = $(_e);
			n = e.offset().left;
			if (p) {
				p[1] = n;
			}
			p = [ n ];
			cols[i] = p;
		});
		p[1] = n + e.outerWidth();

		p = null;
		while (snapTime < this.maxTime) {
			n = originTop + this.computeTimeTop(snapTime);
			if (p) {
				p[1] = n;
			}
			p = [ n ];
			rows.push(p);
			snapTime.add(this.snapDuration);
		}
		p[1] = originTop + this.computeTimeTop(snapTime); // the position of the exclusive end
	},


	// Gets the datetime for the given slot cell
	getCellDate: function(cell) {
		var view = this.view;
		var calendar = view.calendar;

		return calendar.rezoneDate( // since we are adding a time, it needs to be in the calendar's timezone
			view.cellToDate(0, cell.col) // View's coord system only accounts for start-of-day for column
				.time(this.minTime + this.snapDuration * cell.row)
		);
	},


	// Gets the element that represents the whole-day the cell resides on
	getCellDayEl: function(cell) {
		return this.dayEls.eq(cell.col);
	},


	// Computes the top coordinate, relative to the bounds of the grid, of the given date.
	// A `startOfDayDate` must be given for avoiding ambiguity over how to treat midnight.
	computeDateTop: function(date, startOfDayDate) {
		return this.computeTimeTop(
			moment.duration(
				date.clone().stripZone() - startOfDayDate.clone().stripTime()
			)
		);
	},


	// Computes the top coordinate, relative to the bounds of the grid, of the given time (a Duration).
	computeTimeTop: function(time) {
		var slatCoverage = (time - this.minTime) / this.slotDuration; // floating-point value of # of slots covered
		var slatIndex;
		var slatRemainder;
		var slatTop;
		var slatBottom;

		// constrain. because minTime/maxTime might be customized
		slatCoverage = Math.max(0, slatCoverage);
		slatCoverage = Math.min(this.slatEls.length, slatCoverage);

		slatIndex = Math.floor(slatCoverage); // an integer index of the furthest whole slot
		slatRemainder = slatCoverage - slatIndex;
		slatTop = this.slatTops[slatIndex]; // the top position of the furthest whole slot

		if (slatRemainder) { // time spans part-way into the slot
			slatBottom = this.slatTops[slatIndex + 1];
			return slatTop + (slatBottom - slatTop) * slatRemainder; // part-way between slots
		}
		else {
			return slatTop;
		}
	},


	// Queries each `slatEl` for its position relative to the grid's container and stores it in `slatTops`.
	// Includes the the bottom of the last slat as the last item in the array.
	computeSlatTops: function() {
		var tops = [];
		var top;

		this.slatEls.each(function(i, node) {
			top = $(node).position().top;
			tops.push(top);
		});

		tops.push(top + this.slatEls.last().outerHeight()); // bottom of the last slat

		this.slatTops = tops;
	},


	/* Event Drag Visualization
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of an event being dragged over the specified date(s).
	// `end` and `seg` can be null. See View's documentation on renderDrag for more info.
	renderDrag: function(start, end, seg) {
		var opacity;

		if (seg) { // if there is event information for this drag, render a helper event
			this.renderRangeHelper(start, end, seg);

			opacity = this.view.opt('dragOpacity');
			if (opacity !== undefined) {
				this.helperEl.css('opacity', opacity);
			}

			return true; // signal that a helper has been rendered
		}
		else {
			// otherwise, just render a highlight
			this.renderHighlight(
				start,
				end || this.view.calendar.getDefaultEventEnd(false, start)
			);
		}
	},


	// Unrenders any visual indication of an event being dragged
	destroyDrag: function() {
		this.destroyHelper();
		this.destroyHighlight();
	},


	/* Event Resize Visualization
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of an event being resized
	renderResize: function(start, end, seg) {
		this.renderRangeHelper(start, end, seg);
	},


	// Unrenders any visual indication of an event being resized
	destroyResize: function() {
		this.destroyHelper();
	},


	/* Event Helper
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a mock "helper" event. `sourceSeg` is the original segment object and might be null (an external drag)
	renderHelper: function(event, sourceSeg) {
		var segs = this.eventsToSegs([ event ]);
		var tableEl;
		var i, seg;
		var sourceEl;

		segs = this.renderFgSegEls(segs); // assigns each seg's el and returns a subset of segs that were rendered
		tableEl = this.renderSegTable(segs);

		// Try to make the segment that is in the same row as sourceSeg look the same
		for (i = 0; i < segs.length; i++) {
			seg = segs[i];
			if (sourceSeg && sourceSeg.col === seg.col) {
				sourceEl = sourceSeg.el;
				seg.el.css({
					left: sourceEl.css('left'),
					right: sourceEl.css('right'),
					'margin-left': sourceEl.css('margin-left'),
					'margin-right': sourceEl.css('margin-right')
				});
			}
		}

		this.helperEl = $('<div class="fc-helper-skeleton"/>')
			.append(tableEl)
				.appendTo(this.el);
	},


	// Unrenders any mock helper event
	destroyHelper: function() {
		if (this.helperEl) {
			this.helperEl.remove();
			this.helperEl = null;
		}
	},


	/* Selection
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of a selection. Overrides the default, which was to simply render a highlight.
	renderSelection: function(start, end) {
		if (this.view.opt('selectHelper')) { // this setting signals that a mock helper event should be rendered
			this.renderRangeHelper(start, end);
		}
		else {
			this.renderHighlight(start, end);
		}
	},


	// Unrenders any visual indication of a selection
	destroySelection: function() {
		this.destroyHelper();
		this.destroyHighlight();
	},


	/* Fill System (highlight, background events, business hours)
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a set of rectangles over the given time segments.
	// Only returns segments that successfully rendered.
	renderFill: function(type, segs, className) {
		var view = this.view;
		var segCols;
		var skeletonEl;
		var trEl;
		var col, colSegs;
		var tdEl;
		var containerEl;
		var dayDate;
		var i, seg;

		if (segs.length) {

			segs = this.renderFillSegEls(type, segs); // assignes `.el` to each seg. returns successfully rendered segs
			segCols = this.groupSegCols(segs); // group into sub-arrays, and assigns 'col' to each seg

			className = className || type.toLowerCase();
			skeletonEl = $(
				'<div class="fc-' + className + '-skeleton">' +
					'<table><tr/></table>' +
				'</div>'
			);
			trEl = skeletonEl.find('tr');

			for (col = 0; col < segCols.length; col++) {
				colSegs = segCols[col];
				tdEl = $('<td/>').appendTo(trEl);

				if (colSegs.length) {
					containerEl = $('<div class="fc-' + className + '-container"/>').appendTo(tdEl);
					dayDate = view.cellToDate(0, col);

					for (i = 0; i < colSegs.length; i++) {
						seg = colSegs[i];
						containerEl.append(
							seg.el.css({
								top: this.computeDateTop(seg.start, dayDate),
								bottom: -this.computeDateTop(seg.end, dayDate) // the y position of the bottom edge
							})
						);
					}
				}
			}

			this.bookendCells(trEl, type);

			this.el.append(skeletonEl);
			this.elsByFill[type] = skeletonEl;
		}

		return segs;
	}

});

;;

/* Event-rendering methods for the TimeGrid class
----------------------------------------------------------------------------------------------------------------------*/

$.extend(TimeGrid.prototype, {

	eventSkeletonEl: null, // has cells with event-containers, which contain absolutely positioned event elements


	// Renders the given foreground event segments onto the grid
	renderFgSegs: function(segs) {
		segs = this.renderFgSegEls(segs); // returns a subset of the segs. segs that were actually rendered

		this.el.append(
			this.eventSkeletonEl = $('<div class="fc-content-skeleton"/>')
				.append(this.renderSegTable(segs))
		);

		return segs; // return only the segs that were actually rendered
	},


	// Unrenders all currently rendered foreground event segments
	destroyFgSegs: function(segs) {
		if (this.eventSkeletonEl) {
			this.eventSkeletonEl.remove();
			this.eventSkeletonEl = null;
		}
	},


	// Renders and returns the <table> portion of the event-skeleton.
	// Returns an object with properties 'tbodyEl' and 'segs'.
	renderSegTable: function(segs) {
		var tableEl = $('<table><tr/></table>');
		var trEl = tableEl.find('tr');
		var segCols;
		var i, seg;
		var col, colSegs;
		var containerEl;

		segCols = this.groupSegCols(segs); // group into sub-arrays, and assigns 'col' to each seg

		this.computeSegVerticals(segs); // compute and assign top/bottom

		for (col = 0; col < segCols.length; col++) { // iterate each column grouping
			colSegs = segCols[col];
			placeSlotSegs(colSegs); // compute horizontal coordinates, z-index's, and reorder the array

			containerEl = $('<div class="fc-event-container"/>');

			// assign positioning CSS and insert into container
			for (i = 0; i < colSegs.length; i++) {
				seg = colSegs[i];
				seg.el.css(this.generateSegPositionCss(seg));

				// if the height is short, add a className for alternate styling
				if (seg.bottom - seg.top < 30) {
					seg.el.addClass('fc-short');
				}

				containerEl.append(seg.el);
			}

			trEl.append($('<td/>').append(containerEl));
		}

		this.bookendCells(trEl, 'eventSkeleton');

		return tableEl;
	},


	// Refreshes the CSS top/bottom coordinates for each segment element. Probably after a window resize/zoom.
	// Repositions business hours segs too, so not just for events. Maybe shouldn't be here.
	updateSegVerticals: function() {
		var allSegs = (this.segs || []).concat(this.businessHourSegs || []);
		var i;

		this.computeSegVerticals(allSegs);

		for (i = 0; i < allSegs.length; i++) {
			allSegs[i].el.css(
				this.generateSegVerticalCss(allSegs[i])
			);
		}
	},


	// For each segment in an array, computes and assigns its top and bottom properties
	computeSegVerticals: function(segs) {
		var i, seg;

		for (i = 0; i < segs.length; i++) {
			seg = segs[i];
			seg.top = this.computeDateTop(seg.start, seg.start);
			seg.bottom = this.computeDateTop(seg.end, seg.start);
		}
	},


	// Renders the HTML for a single event segment's default rendering
	fgSegHtml: function(seg, disableResizing) {
		var view = this.view;
		var event = seg.event;
		var isDraggable = view.isEventDraggable(event);
		var isResizable = !disableResizing && seg.isEnd && view.isEventResizable(event);
		var classes = this.getSegClasses(seg, isDraggable, isResizable);
		var skinCss = this.getEventSkinCss(event);
		var timeText;
		var fullTimeText; // more verbose time text. for the print stylesheet
		var startTimeText; // just the start time text

		classes.unshift('fc-time-grid-event');

		if (view.isMultiDayEvent(event)) { // if the event appears to span more than one day...
			// Don't display time text on segments that run entirely through a day.
			// That would appear as midnight-midnight and would look dumb.
			// Otherwise, display the time text for the *segment's* times (like 6pm-midnight or midnight-10am)
			if (seg.isStart || seg.isEnd) {
				timeText = view.getEventTimeText(seg.start, seg.end);
				fullTimeText = view.getEventTimeText(seg.start, seg.end, 'LT');
				startTimeText = view.getEventTimeText(seg.start, null);
			}
		} else {
			// Display the normal time text for the *event's* times
			timeText = view.getEventTimeText(event);
			fullTimeText = view.getEventTimeText(event, 'LT');
			startTimeText = view.getEventTimeText(event.start, null);
		}

		return '<a class="' + classes.join(' ') + '"' +
			(event.url ?
				' href="' + htmlEscape(event.url) + '"' :
				''
				) +
			(skinCss ?
				' style="' + skinCss + '"' :
				''
				) +
			'>' +
				'<div class="fc-content">' +
					(timeText ?
						'<div class="fc-time"' +
						' data-start="' + htmlEscape(startTimeText) + '"' +
						' data-full="' + htmlEscape(fullTimeText) + '"' +
						'>' +
							'<span>' + htmlEscape(timeText) + '</span>' +
						'</div>' :
						''
						) +
					(event.title ?
						'<div class="fc-title">' +
							htmlEscape(event.title) +
						'</div>' :
						''
						) +
				'</div>' +
				'<div class="fc-bg"/>' +
				(isResizable ?
					'<div class="fc-resizer"/>' :
					''
					) +
			'</a>';
	},


	// Generates an object with CSS properties/values that should be applied to an event segment element.
	// Contains important positioning-related properties that should be applied to any event element, customized or not.
	generateSegPositionCss: function(seg) {
		var view = this.view;
		var isRTL = view.opt('isRTL');
		var shouldOverlap = view.opt('slotEventOverlap');
		var backwardCoord = seg.backwardCoord; // the left side if LTR. the right side if RTL. floating-point
		var forwardCoord = seg.forwardCoord; // the right side if LTR. the left side if RTL. floating-point
		var props = this.generateSegVerticalCss(seg); // get top/bottom first
		var left; // amount of space from left edge, a fraction of the total width
		var right; // amount of space from right edge, a fraction of the total width

		if (shouldOverlap) {
			// double the width, but don't go beyond the maximum forward coordinate (1.0)
			forwardCoord = Math.min(1, backwardCoord + (forwardCoord - backwardCoord) * 2);
		}

		if (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[isRTL ? 'marginLeft' : 'marginRight'] = 10 * 2; // 10 is a guesstimate of the icon's width 
		}

		return props;
	},


	// Generates an object with CSS properties for the top/bottom coordinates of a segment element
	generateSegVerticalCss: function(seg) {
		return {
			top: seg.top,
			bottom: -seg.bottom // flipped because needs to be space beyond bottom edge of event container
		};
	},


	// Given a flat array of segments, return an array of sub-arrays, grouped by each segment's col
	groupSegCols: function(segs) {
		var view = this.view;
		var segCols = [];
		var i;

		for (i = 0; i < view.colCnt; i++) {
			segCols.push([]);
		}

		for (i = 0; i < segs.length; i++) {
			segCols[segs[i].col].push(segs[i]);
		}

		return segCols;
	}

});


// Given an array of segments that are all in the same column, sets the backwardCoord and forwardCoord on each.
// Also reorders the given array by date!
function placeSlotSegs(segs) {
	var levels;
	var level0;
	var i;

	segs.sort(compareSegs); // order by date
	levels = buildSlotSegLevels(segs);
	computeForwardSlotSegs(levels);

	if ((level0 = levels[0])) {

		for (i = 0; i < level0.length; i++) {
			computeSlotSegPressures(level0[i]);
		}

		for (i = 0; i < level0.length; i++) {
			computeSlotSegCoords(level0[i], 0, 0);
		}
	}
}


// 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;
	}
}


// 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.
function computeSlotSegCoords(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
			forwardSegs.sort(compareForwardSlotSegs);

			// this segment's forwardCoord will be calculated from the backwardCoord of the
			// highest-pressure forward segment.
			computeSlotSegCoords(forwardSegs[0], seriesBackwardPressure + 1, seriesBackwardCoord);
			seg.forwardCoord = forwardSegs[0].backwardCoord;
		}

		// calculate the backwardCoord from the forwardCoord. consider the series
		seg.backwardCoord = seg.forwardCoord -
			(seg.forwardCoord - seriesBackwardCoord) / // available width for series
			(seriesBackwardPressure + 1); // # of segments in the series

		// use this segment's coordinates to computed the coordinates of the less-pressurized
		// forward segments
		for (i=0; i<forwardSegs.length; i++) {
			computeSlotSegCoords(forwardSegs[i], 0, seg.forwardCoord);
		}
	}
}


// 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;
}


// A cmp function for determining which forward segment to rely on more when computing coordinates.
function compareForwardSlotSegs(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...
		compareSegs(seg1, seg2);
}

;;

/* An abstract class from which other views inherit from
----------------------------------------------------------------------------------------------------------------------*/
// Newer methods should be written as prototype methods, not in the monster `View` function at the bottom.

View.prototype = {

	calendar: null, // owner Calendar object
	coordMap: null, // a CoordMap object for converting pixel regions to dates
	el: null, // the view's containing element. set by Calendar

	// important Moments
	start: null, // the date of the very first cell
	end: null, // the date after the very last cell
	intervalStart: null, // the start of the interval of time the view represents (1st of month for month view)
	intervalEnd: null, // the exclusive end of the interval of time the view represents

	// used for cell-to-date and date-to-cell calculations
	rowCnt: null, // # of weeks
	colCnt: null, // # of days displayed in a week

	isSelected: false, // boolean whether cells are user-selected or not

	// subclasses can optionally use a scroll container
	scrollerEl: null, // the element that will most likely scroll when content is too tall
	scrollTop: null, // cached vertical scroll value

	// classNames styled by jqui themes
	widgetHeaderClass: null,
	widgetContentClass: null,
	highlightStateClass: null,

	// document handlers, bound to `this` object
	documentMousedownProxy: null,
	documentDragStartProxy: null,


	// Serves as a "constructor" to suppliment the monster `View` constructor below
	init: function() {
		var tm = this.opt('theme') ? 'ui' : 'fc';

		this.widgetHeaderClass = tm + '-widget-header';
		this.widgetContentClass = tm + '-widget-content';
		this.highlightStateClass = tm + '-state-highlight';

		// save references to `this`-bound handlers
		this.documentMousedownProxy = $.proxy(this, 'documentMousedown');
		this.documentDragStartProxy = $.proxy(this, 'documentDragStart');
	},


	// Renders the view inside an already-defined `this.el`.
	// Subclasses should override this and then call the super method afterwards.
	render: function() {
		this.updateSize();
		this.trigger('viewRender', this, this, this.el);

		// attach handlers to document. do it here to allow for destroy/rerender
		$(document)
			.on('mousedown', this.documentMousedownProxy)
			.on('dragstart', this.documentDragStartProxy); // jqui drag
	},


	// Clears all view rendering, event elements, and unregisters handlers
	destroy: function() {
		this.unselect();
		this.trigger('viewDestroy', this, this, this.el);
		this.destroyEvents();
		this.el.empty(); // removes inner contents but leaves the element intact

		$(document)
			.off('mousedown', this.documentMousedownProxy)
			.off('dragstart', this.documentDragStartProxy);
	},


	// Used to determine what happens when the users clicks next/prev. Given -1 for prev, 1 for next.
	// Should apply the delta to `date` (a Moment) and return it.
	incrementDate: function(date, delta) {
		// subclasses should implement
	},


	/* Dimensions
	------------------------------------------------------------------------------------------------------------------*/


	// Refreshes anything dependant upon sizing of the container element of the grid
	updateSize: function(isResize) {
		if (isResize) {
			this.recordScroll();
		}
		this.updateHeight();
		this.updateWidth();
	},


	// Refreshes the horizontal dimensions of the calendar
	updateWidth: function() {
		// subclasses should implement
	},


	// Refreshes the vertical dimensions of the calendar
	updateHeight: function() {
		var calendar = this.calendar; // we poll the calendar for height information

		this.setHeight(
			calendar.getSuggestedViewHeight(),
			calendar.isHeightAuto()
		);
	},


	// Updates the vertical dimensions of the calendar to the specified height.
	// if `isAuto` is set to true, height becomes merely a suggestion and the view should use its "natural" height.
	setHeight: function(height, isAuto) {
		// subclasses should implement
	},


	// Given the total height of the view, return the number of pixels that should be used for the scroller.
	// Utility for subclasses.
	computeScrollerHeight: function(totalHeight) {
		var both = this.el.add(this.scrollerEl);
		var otherHeight; // cumulative height of everything that is not the scrollerEl in the view (header+borders)

		// fuckin IE8/9/10/11 sometimes returns 0 for dimensions. this weird hack was the only thing that worked
		both.css({
			position: 'relative', // cause a reflow, which will force fresh dimension recalculation
			left: -1 // ensure reflow in case the el was already relative. negative is less likely to cause new scroll
		});
		otherHeight = this.el.outerHeight() - this.scrollerEl.height(); // grab the dimensions
		both.css({ position: '', left: '' }); // undo hack

		return totalHeight - otherHeight;
	},


	// Called for remembering the current scroll value of the scroller.
	// Should be called before there is a destructive operation (like removing DOM elements) that might inadvertently
	// change the scroll of the container.
	recordScroll: function() {
		if (this.scrollerEl) {
			this.scrollTop = this.scrollerEl.scrollTop();
		}
	},


	// Set the scroll value of the scroller to the previously recorded value.
	// Should be called after we know the view's dimensions have been restored following some type of destructive
	// operation (like temporarily removing DOM elements).
	restoreScroll: function() {
		if (this.scrollTop !== null) {
			this.scrollerEl.scrollTop(this.scrollTop);
		}
	},


	/* Events
	------------------------------------------------------------------------------------------------------------------*/


	// Renders the events onto the view.
	// Should be overriden by subclasses. Subclasses should call the super-method afterwards.
	renderEvents: function(events) {
		this.segEach(function(seg) {
			this.trigger('eventAfterRender', seg.event, seg.event, seg.el);
		});
		this.trigger('eventAfterAllRender');
	},


	// Removes event elements from the view.
	// Should be overridden by subclasses. Should call this super-method FIRST, then subclass DOM destruction.
	destroyEvents: function() {
		this.segEach(function(seg) {
			this.trigger('eventDestroy', seg.event, seg.event, seg.el);
		});
	},


	// Given an event and the default element used for rendering, returns the element that should actually be used.
	// Basically runs events and elements through the eventRender hook.
	resolveEventEl: function(event, el) {
		var custom = this.trigger('eventRender', event, event, el);

		if (custom === false) { // means don't render at all
			el = null;
		}
		else if (custom && custom !== true) {
			el = $(custom);
		}

		return el;
	},


	// Hides all rendered event segments linked to the given event
	showEvent: function(event) {
		this.segEach(function(seg) {
			seg.el.css('visibility', '');
		}, event);
	},


	// Shows all rendered event segments linked to the given event
	hideEvent: function(event) {
		this.segEach(function(seg) {
			seg.el.css('visibility', 'hidden');
		}, event);
	},


	// Iterates through event segments. Goes through all by default.
	// If the optional `event` argument is specified, only iterates through segments linked to that event.
	// The `this` value of the callback function will be the view.
	segEach: function(func, event) {
		var segs = this.getSegs();
		var i;

		for (i = 0; i < segs.length; i++) {
			if (!event || segs[i].event._id === event._id) {
				func.call(this, segs[i]);
			}
		}
	},


	// Retrieves all the rendered segment objects for the view
	getSegs: function() {
		// subclasses must implement
	},


	/* Event Drag Visualization
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of an event hovering over the specified date.
	// `end` is a Moment and might be null.
	// `seg` might be null. if specified, it is the segment object of the event being dragged.
	//       otherwise, an external event from outside the calendar is being dragged.
	renderDrag: function(start, end, seg) {
		// subclasses should implement
	},


	// Unrenders a visual indication of event hovering
	destroyDrag: function() {
		// subclasses should implement
	},


	// Handler for accepting externally dragged events being dropped in the view.
	// Gets called when jqui's 'dragstart' is fired.
	documentDragStart: function(ev, ui) {
		var _this = this;
		var calendar = this.calendar;
		var eventStart = null; // a null value signals an unsuccessful drag
		var eventEnd = null;
		var visibleEnd = null; // will be calculated event when no eventEnd
		var el;
		var accept;
		var meta;
		var eventProps; // if an object, signals an event should be created upon drop
		var dragListener;

		if (this.opt('droppable')) { // only listen if this setting is on
			el = $(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)) {

				meta = getDraggedElMeta(el); // data for possibly creating an event
				eventProps = meta.eventProps;

				// listener that tracks mouse movement over date-associated pixel regions
				dragListener = new DragListener(this.coordMap, {
					cellOver: function(cell, cellDate) {
						eventStart = cellDate;
						eventEnd = meta.duration ? eventStart.clone().add(meta.duration) : null;
						visibleEnd = eventEnd || calendar.getDefaultEventEnd(!eventStart.hasTime(), eventStart);

						// keep the start/end up to date when dragging
						if (eventProps) {
							$.extend(eventProps, { start: eventStart, end: eventEnd });
						}

						if (calendar.isExternalDragAllowedInRange(eventStart, visibleEnd, eventProps)) {
							_this.renderDrag(eventStart, visibleEnd);
						}
						else {
							eventStart = null; // signal unsuccessful
							disableCursor();
						}
					},
					cellOut: function() {
						eventStart = null;
						_this.destroyDrag();
						enableCursor();
					}
				});

				// gets called, only once, when jqui drag is finished
				$(document).one('dragstop', function(ev, ui) {
					var renderedEvents;

					_this.destroyDrag();
					enableCursor();

					if (eventStart) { // element was dropped on a valid date/time cell

						// if dropped on an all-day cell, and element's metadata specified a time, set it
						if (meta.startTime && !eventStart.hasTime()) {
							eventStart.time(meta.startTime);
						}

						// trigger 'drop' regardless of whether element represents an event
						_this.trigger('drop', el[0], eventStart, ev, ui);

						// create an event from the given properties and the latest dates
						if (eventProps) {
							renderedEvents = calendar.renderEvent(eventProps, meta.stick);
							_this.trigger('eventReceive', null, renderedEvents[0]); // signal an external event landed
						}
					}
				});

				dragListener.startDrag(ev); // start listening immediately
			}
		}
	},


	/* Selection
	------------------------------------------------------------------------------------------------------------------*/


	// Selects a date range on the view. `start` and `end` are both Moments.
	// `ev` is the native mouse event that begin the interaction.
	select: function(start, end, ev) {
		this.unselect(ev);
		this.renderSelection(start, end);
		this.reportSelection(start, end, ev);
	},


	// Renders a visual indication of the selection
	renderSelection: function(start, end) {
		// subclasses should implement
	},


	// Called when a new selection is made. Updates internal state and triggers handlers.
	reportSelection: function(start, end, ev) {
		this.isSelected = true;
		this.trigger('select', null, start, end, ev);
	},


	// Undoes a selection. updates in the internal state and triggers handlers.
	// `ev` is the native mouse event that began the interaction.
	unselect: function(ev) {
		if (this.isSelected) {
			this.isSelected = false;
			this.destroySelection();
			this.trigger('unselect', null, ev);
		}
	},


	// Unrenders a visual indication of selection
	destroySelection: function() {
		// subclasses should implement
	},


	// Handler for unselecting when the user clicks something and the 'unselectAuto' setting is on
	documentMousedown: function(ev) {
		var ignore;

		// is there a selection, and has the user made a proper left click?
		if (this.isSelected && this.opt('unselectAuto') && isPrimaryMouseButton(ev)) {

			// only unselect if the clicked element is not identical to or inside of an 'unselectCancel' element
			ignore = this.opt('unselectCancel');
			if (!ignore || !$(ev.target).closest(ignore).length) {
				this.unselect(ev);
			}
		}
	}

};


// We are mixing JavaScript OOP design patterns here by putting methods and member variables in the closed scope of the
// constructor. Going forward, methods should be part of the prototype.
function View(calendar) {
	var t = this;
	
	// exports
	t.calendar = calendar;
	t.opt = opt;
	t.trigger = trigger;
	t.isEventDraggable = isEventDraggable;
	t.isEventResizable = isEventResizable;
	t.eventDrop = eventDrop;
	t.eventResize = eventResize;
	
	// imports
	var reportEventChange = calendar.reportEventChange;
	
	// locals
	var options = calendar.options;
	var nextDayThreshold = moment.duration(options.nextDayThreshold);


	t.init(); // the "constructor" that concerns the prototype methods
	
	
	function opt(name) {
		var v = options[name];
		if ($.isPlainObject(v) && !isForcedAtomicOption(name)) {
			return smartProperty(v, t.name);
		}
		return v;
	}

	
	function trigger(name, thisObj) {
		return calendar.trigger.apply(
			calendar,
			[name, thisObj || t].concat(Array.prototype.slice.call(arguments, 2), [t])
		);
	}
	


	/* Event Editable Boolean Calculations
	------------------------------------------------------------------------------*/

	
	function isEventDraggable(event) {
		var source = event.source || {};

		return firstDefined(
			event.startEditable,
			source.startEditable,
			opt('eventStartEditable'),
			event.editable,
			source.editable,
			opt('editable')
		);
	}
	
	
	function isEventResizable(event) {
		var source = event.source || {};

		return firstDefined(
			event.durationEditable,
			source.durationEditable,
			opt('eventDurationEditable'),
			event.editable,
			source.editable,
			opt('editable')
		);
	}
	
	
	
	/* Event Elements
	------------------------------------------------------------------------------*/


	// Compute the text that should be displayed on an event's element.
	// Based off the settings of the view. Possible signatures:
	//   .getEventTimeText(event, formatStr)
	//   .getEventTimeText(startMoment, endMoment, formatStr)
	//   .getEventTimeText(startMoment, null, formatStr)
	// `timeFormat` is used but the `formatStr` argument can be used to override.
	t.getEventTimeText = function(event, formatStr) {
		var start;
		var end;

		if (typeof event === 'object' && typeof formatStr === 'object') {
			// first two arguments are actually moments (or null). shift arguments.
			start = event;
			end = formatStr;
			formatStr = arguments[2];
		}
		else {
			// otherwise, an event object was the first argument
			start = event.start;
			end = event.end;
		}

		formatStr = formatStr || opt('timeFormat');

		if (end && opt('displayEventEnd')) {
			return calendar.formatRange(start, end, formatStr);
		}
		else {
			return calendar.formatDate(start, formatStr);
		}
	};

	
	
	/* Event Modification Reporting
	---------------------------------------------------------------------------------*/

	
	function eventDrop(el, event, newStart, ev) {
		var mutateResult = calendar.mutateEvent(event, newStart, null);

		trigger(
			'eventDrop',
			el,
			event,
			mutateResult.dateDelta,
			function() {
				mutateResult.undo();
				reportEventChange();
			},
			ev,
			{} // jqui dummy
		);

		reportEventChange();
	}


	function eventResize(el, event, newEnd, ev) {
		var mutateResult = calendar.mutateEvent(event, null, newEnd);

		trigger(
			'eventResize',
			el,
			event,
			mutateResult.durationDelta,
			function() {
				mutateResult.undo();
				reportEventChange();
			},
			ev,
			{} // jqui dummy
		);

		reportEventChange();
	}


	// ====================================================================================================
	// Utilities for day "cells"
	// ====================================================================================================
	// The "basic" views are completely made up of day cells.
	// The "agenda" views have day cells at the top "all day" slot.
	// This was the obvious common place to put these utilities, but they should be abstracted out into
	// a more meaningful class (like DayEventRenderer).
	// ====================================================================================================


	// For determining how a given "cell" translates into a "date":
	//
	// 1. Convert the "cell" (row and column) into a "cell offset" (the # of the cell, cronologically from the first).
	//    Keep in mind that column indices are inverted with isRTL. This is taken into account.
	//
	// 2. Convert the "cell offset" to a "day offset" (the # of days since the first visible day in the view).
	//
	// 3. Convert the "day offset" into a "date" (a Moment).
	//
	// The reverse transformation happens when transforming a date into a cell.


	// exports
	t.isHiddenDay = isHiddenDay;
	t.skipHiddenDays = skipHiddenDays;
	t.getCellsPerWeek = getCellsPerWeek;
	t.dateToCell = dateToCell;
	t.dateToDayOffset = dateToDayOffset;
	t.dayOffsetToCellOffset = dayOffsetToCellOffset;
	t.cellOffsetToCell = cellOffsetToCell;
	t.cellToDate = cellToDate;
	t.cellToCellOffset = cellToCellOffset;
	t.cellOffsetToDayOffset = cellOffsetToDayOffset;
	t.dayOffsetToDate = dayOffsetToDate;
	t.rangeToSegments = rangeToSegments;
	t.isMultiDayEvent = isMultiDayEvent;


	// internals
	var hiddenDays = 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 cellsPerWeek;
	var dayToCellMap = []; // hash from dayIndex -> cellIndex, for one week
	var cellToDayMap = []; // hash from cellIndex -> dayIndex, for one week
	var isRTL = opt('isRTL');


	// initialize important internal variables
	(function() {

		if (opt('weekends') === false) {
			hiddenDays.push(0, 6); // 0=sunday, 6=saturday
		}

		// Loop through a hypothetical week and determine which
		// days-of-week are hidden. Record in both hashes (one is the reverse of the other).
		for (var dayIndex=0, cellIndex=0; dayIndex<7; dayIndex++) {
			dayToCellMap[dayIndex] = cellIndex;
			isHiddenDayHash[dayIndex] = $.inArray(dayIndex, hiddenDays) != -1;
			if (!isHiddenDayHash[dayIndex]) {
				cellToDayMap[cellIndex] = dayIndex;
				cellIndex++;
			}
		}

		cellsPerWeek = cellIndex;
		if (!cellsPerWeek) {
			throw 'invalid hiddenDays'; // all days were hidden? bad.
		}

	})();


	// Is the current day hidden?
	// `day` is a day-of-week index (0-6), or a Moment
	function isHiddenDay(day) {
		if (moment.isMoment(day)) {
			day = day.day();
		}
		return isHiddenDayHash[day];
	}


	function getCellsPerWeek() {
		return cellsPerWeek;
	}


	// Incrementing the current day until it is no longer a hidden day, returning a copy.
	// If the initial value of `date` is not a hidden day, don't do anything.
	// Pass `isExclusive` as `true` if you are dealing with an end date.
	// `inc` defaults to `1` (increment one day forward each time)
	function skipHiddenDays(date, inc, isExclusive) {
		var out = date.clone();
		inc = inc || 1;
		while (
			isHiddenDayHash[(out.day() + (isExclusive ? inc : 0) + 7) % 7]
		) {
			out.add(inc, 'days');
		}
		return out;
	}


	//
	// TRANSFORMATIONS: cell -> cell offset -> day offset -> date
	//

	// cell -> date (combines all transformations)
	// Possible arguments:
	// - row, col
	// - { row:#, col: # }
	function cellToDate() {
		var cellOffset = cellToCellOffset.apply(null, arguments);
		var dayOffset = cellOffsetToDayOffset(cellOffset);
		var date = dayOffsetToDate(dayOffset);
		return date;
	}

	// cell -> cell offset
	// Possible arguments:
	// - row, col
	// - { row:#, col:# }
	function cellToCellOffset(row, col) {
		var colCnt = t.colCnt;

		// rtl variables. wish we could pre-populate these. but where?
		var dis = isRTL ? -1 : 1;
		var dit = isRTL ? colCnt - 1 : 0;

		if (typeof row == 'object') {
			col = row.col;
			row = row.row;
		}
		var cellOffset = row * colCnt + (col * dis + dit); // column, adjusted for RTL (dis & dit)

		return cellOffset;
	}

	// cell offset -> day offset
	function cellOffsetToDayOffset(cellOffset) {
		var day0 = t.start.day(); // first date's day of week
		cellOffset += dayToCellMap[day0]; // normlize cellOffset to beginning-of-week
		return Math.floor(cellOffset / cellsPerWeek) * 7 + // # of days from full weeks
			cellToDayMap[ // # of days from partial last week
				(cellOffset % cellsPerWeek + cellsPerWeek) % cellsPerWeek // crazy math to handle negative cellOffsets
			] -
			day0; // adjustment for beginning-of-week normalization
	}

	// day offset -> date
	function dayOffsetToDate(dayOffset) {
		return t.start.clone().add(dayOffset, 'days');
	}


	//
	// TRANSFORMATIONS: date -> day offset -> cell offset -> cell
	//

	// date -> cell (combines all transformations)
	function dateToCell(date) {
		var dayOffset = dateToDayOffset(date);
		var cellOffset = dayOffsetToCellOffset(dayOffset);
		var cell = cellOffsetToCell(cellOffset);
		return cell;
	}

	// date -> day offset
	function dateToDayOffset(date) {
		return date.clone().stripTime().diff(t.start, 'days');
	}

	// day offset -> cell offset
	function dayOffsetToCellOffset(dayOffset) {
		var day0 = t.start.day(); // first date's day of week
		dayOffset += day0; // normalize dayOffset to beginning-of-week
		return Math.floor(dayOffset / 7) * cellsPerWeek + // # of cells from full weeks
			dayToCellMap[ // # of cells from partial last week
				(dayOffset % 7 + 7) % 7 // crazy math to handle negative dayOffsets
			] -
			dayToCellMap[day0]; // adjustment for beginning-of-week normalization
	}

	// cell offset -> cell (object with row & col keys)
	function cellOffsetToCell(cellOffset) {
		var colCnt = t.colCnt;

		// rtl variables. wish we could pre-populate these. but where?
		var dis = isRTL ? -1 : 1;
		var dit = isRTL ? colCnt - 1 : 0;

		var row = Math.floor(cellOffset / colCnt);
		var col = ((cellOffset % colCnt + colCnt) % colCnt) * dis + dit; // column, adjusted for RTL (dis & dit)
		return {
			row: row,
			col: col
		};
	}


	//
	// Converts a date range into an array of segment objects.
	// "Segments" are horizontal stretches of time, sliced up by row.
	// A segment object has the following properties:
	// - row
	// - cols
	// - isStart
	// - isEnd
	//
	function rangeToSegments(start, end) {

		var rowCnt = t.rowCnt;
		var colCnt = t.colCnt;
		var segments = []; // array of segments to return

		// day offset for given date range
		var dayRange = computeDayRange(start, end); // convert to a whole-day range
		var rangeDayOffsetStart = dateToDayOffset(dayRange.start);
		var rangeDayOffsetEnd = dateToDayOffset(dayRange.end); // an exclusive value

		// first and last cell offset for the given date range
		// "last" implies inclusivity
		var rangeCellOffsetFirst = dayOffsetToCellOffset(rangeDayOffsetStart);
		var rangeCellOffsetLast = dayOffsetToCellOffset(rangeDayOffsetEnd) - 1;

		// loop through all the rows in the view
		for (var row=0; row<rowCnt; row++) {

			// first and last cell offset for the row
			var rowCellOffsetFirst = row * colCnt;
			var rowCellOffsetLast = rowCellOffsetFirst + colCnt - 1;

			// get the segment's cell offsets by constraining the range's cell offsets to the bounds of the row
			var segmentCellOffsetFirst = Math.max(rangeCellOffsetFirst, rowCellOffsetFirst);
			var segmentCellOffsetLast = Math.min(rangeCellOffsetLast, rowCellOffsetLast);

			// make sure segment's offsets are valid and in view
			if (segmentCellOffsetFirst <= segmentCellOffsetLast) {

				// translate to cells
				var segmentCellFirst = cellOffsetToCell(segmentCellOffsetFirst);
				var segmentCellLast = cellOffsetToCell(segmentCellOffsetLast);

				// view might be RTL, so order by leftmost column
				var cols = [ segmentCellFirst.col, segmentCellLast.col ].sort(compareNumbers);

				// Determine if segment's first/last cell is the beginning/end of the date range.
				// We need to compare "day offset" because "cell offsets" are often ambiguous and
				// can translate to multiple days, and an edge case reveals itself when we the
				// range's first cell is hidden (we don't want isStart to be true).
				var isStart = cellOffsetToDayOffset(segmentCellOffsetFirst) == rangeDayOffsetStart;
				var isEnd = cellOffsetToDayOffset(segmentCellOffsetLast) + 1 == rangeDayOffsetEnd;
				                                                   // +1 for comparing exclusively

				segments.push({
					row: row,
					leftCol: cols[0],
					rightCol: cols[1],
					isStart: isStart,
					isEnd: isEnd
				});
			}
		}

		return segments;
	}


	// Returns the date range of the full days the given range visually appears to occupy.
	// Returns object with properties `start` (moment) and `end` (moment, exclusive end).
	function computeDayRange(start, end) {
		var startDay = start.clone().stripTime(); // the beginning of the day the range starts
		var endDay;
		var endTimeMS;

		if (end) {
			endDay = end.clone().stripTime(); // the beginning of the day the range exclusively ends
			endTimeMS = +end.time(); // # of milliseconds into `endDay`

			// If the end time is actually inclusively part of the next day and is equal to or
			// beyond the next day threshold, adjust the end to be the exclusive end of `endDay`.
			// Otherwise, leaving it as inclusive will cause it to exclude `endDay`.
			if (endTimeMS && endTimeMS >= nextDayThreshold) {
				endDay.add(1, 'days');
			}
		}

		// If no end was specified, or if it is within `startDay` but not past nextDayThreshold,
		// assign the default duration of one day.
		if (!end || endDay <= startDay) {
			endDay = startDay.clone().add(1, 'days');
		}

		return { start: startDay, end: endDay };
	}


	// Does the given event visually appear to occupy more than one day?
	function isMultiDayEvent(event) {
		var range = computeDayRange(event.start, event.end);

		return range.end.diff(range.start, 'days') > 1;
	}

}


/* Utils
----------------------------------------------------------------------------------------------------------------------*/

// 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 };
}

;;

/* 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.

function BasicView(calendar) {
	View.call(this, calendar); // call the super-constructor
	this.dayGrid = new DayGrid(this);
	this.coordMap = this.dayGrid.coordMap; // the view's date-to-cell mapping is identical to the subcomponent's
}


BasicView.prototype = createObject(View.prototype); // define the super-class
$.extend(BasicView.prototype, {

	dayGrid: null, // the main subcomponent that does most of the heavy lifting

	dayNumbersVisible: false, // display day numbers on each day cell?
	weekNumbersVisible: false, // display week numbers along the side?

	weekNumberWidth: null, // width of all the week-number cells running down the side

	headRowEl: null, // the fake row element of the day-of-week header


	// Renders the view into `this.el`, which should already be assigned.
	// rowCnt, colCnt, and dayNumbersVisible have been calculated by a subclass and passed here.
	render: function(rowCnt, colCnt, dayNumbersVisible) {

		// needed for cell-to-date and date-to-cell calculations in View
		this.rowCnt = rowCnt;
		this.colCnt = colCnt;

		this.dayNumbersVisible = dayNumbersVisible;
		this.weekNumbersVisible = this.opt('weekNumbers');
		this.dayGrid.numbersVisible = this.dayNumbersVisible || this.weekNumbersVisible;

		this.el.addClass('fc-basic-view').html(this.renderHtml());

		this.headRowEl = this.el.find('thead .fc-row');

		this.scrollerEl = this.el.find('.fc-day-grid-container');
		this.dayGrid.coordMap.containerEl = this.scrollerEl; // constrain clicks/etc to the dimensions of the scroller

		this.dayGrid.el = this.el.find('.fc-day-grid');
		this.dayGrid.render(this.hasRigidRows());

		View.prototype.render.call(this); // call the super-method
	},


	// Make subcomponents ready for cleanup
	destroy: function() {
		this.dayGrid.destroy();
		View.prototype.destroy.call(this); // call the super-method
	},


	// Builds the HTML skeleton for the view.
	// The day-grid component will render inside of a container defined by this HTML.
	renderHtml: function() {
		return '' +
			'<table>' +
				'<thead>' +
					'<tr>' +
						'<td class="' + this.widgetHeaderClass + '">' +
							this.dayGrid.headHtml() + // render the day-of-week headers
						'</td>' +
					'</tr>' +
				'</thead>' +
				'<tbody>' +
					'<tr>' +
						'<td class="' + this.widgetContentClass + '">' +
							'<div class="fc-day-grid-container">' +
								'<div class="fc-day-grid"/>' +
							'</div>' +
						'</td>' +
					'</tr>' +
				'</tbody>' +
			'</table>';
	},


	// Generates the HTML that will go before the day-of week header cells.
	// Queried by the DayGrid subcomponent when generating rows. Ordering depends on isRTL.
	headIntroHtml: function() {
		if (this.weekNumbersVisible) {
			return '' +
				'<th class="fc-week-number ' + this.widgetHeaderClass + '" ' + this.weekNumberStyleAttr() + '>' +
					'<span>' + // needed for matchCellWidths
						htmlEscape(this.opt('weekNumberTitle')) +
					'</span>' +
				'</th>';
		}
	},


	// Generates the HTML that will go before content-skeleton cells that display the day/week numbers.
	// Queried by the DayGrid subcomponent. Ordering depends on isRTL.
	numberIntroHtml: function(row) {
		if (this.weekNumbersVisible) {
			return '' +
				'<td class="fc-week-number" ' + this.weekNumberStyleAttr() + '>' +
					'<span>' + // needed for matchCellWidths
						this.calendar.calculateWeekNumber(this.cellToDate(row, 0)) +
					'</span>' +
				'</td>';
		}
	},


	// Generates the HTML that goes before the day bg cells for each day-row.
	// Queried by the DayGrid subcomponent. Ordering depends on isRTL.
	dayIntroHtml: function() {
		if (this.weekNumbersVisible) {
			return '<td class="fc-week-number ' + this.widgetContentClass + '" ' +
				this.weekNumberStyleAttr() + '></td>';
		}
	},


	// Generates the HTML that goes before every other type of row generated by DayGrid. Ordering depends on isRTL.
	// Affects helper-skeleton and highlight-skeleton rows.
	introHtml: function() {
		if (this.weekNumbersVisible) {
			return '<td class="fc-week-number" ' + this.weekNumberStyleAttr() + '></td>';
		}
	},


	// Generates the HTML for the <td>s of the "number" row in the DayGrid's content skeleton.
	// The number row will only exist if either day numbers or week numbers are turned on.
	numberCellHtml: function(row, col, date) {
		var classes;

		if (!this.dayNumbersVisible) { // if there are week numbers but not day numbers
			return '<td/>'; //  will create an empty space above events :(
		}

		classes = this.dayGrid.getDayClasses(date);
		classes.unshift('fc-day-number');

		return '' +
			'<td class="' + classes.join(' ') + '" data-date="' + date.format() + '">' +
				date.date() +
			'</td>';
	},


	// Generates an HTML attribute string for setting the width of the week number column, if it is known
	weekNumberStyleAttr: function() {
		if (this.weekNumberWidth !== null) {
			return 'style="width:' + this.weekNumberWidth + 'px"';
		}
		return '';
	},


	// Determines whether each row should have a constant height
	hasRigidRows: function() {
		var eventLimit = this.opt('eventLimit');
		return eventLimit && typeof eventLimit !== 'number';
	},


	/* Dimensions
	------------------------------------------------------------------------------------------------------------------*/


	// Refreshes the horizontal dimensions of the view
	updateWidth: function() {
		if (this.weekNumbersVisible) {
			// Make sure all week number cells running down the side have the same width.
			// Record the width for cells created later.
			this.weekNumberWidth = matchCellWidths(
				this.el.find('.fc-week-number')
			);
		}
	},


	// Adjusts the vertical dimensions of the view to the specified values
	setHeight: function(totalHeight, isAuto) {
		var eventLimit = this.opt('eventLimit');
		var scrollerHeight;

		// reset all heights to be natural
		unsetScroller(this.scrollerEl);
		uncompensateScroll(this.headRowEl);

		this.dayGrid.destroySegPopover(); // kill the "more" popover if displayed

		// is the event limit a constant level number?
		if (eventLimit && typeof eventLimit === 'number') {
			this.dayGrid.limitRows(eventLimit); // limit the levels first so the height can redistribute after
		}

		scrollerHeight = this.computeScrollerHeight(totalHeight);
		this.setGridHeight(scrollerHeight, isAuto);

		// is the event limit dynamically calculated?
		if (eventLimit && typeof eventLimit !== 'number') {
			this.dayGrid.limitRows(eventLimit); // limit the levels after the grid's row heights have been set
		}

		if (!isAuto && setPotentialScroller(this.scrollerEl, scrollerHeight)) { // using scrollbars?

			compensateScroll(this.headRowEl, getScrollbarWidths(this.scrollerEl));

			// doing the scrollbar compensation might have created text overflow which created more height. redo
			scrollerHeight = this.computeScrollerHeight(totalHeight);
			this.scrollerEl.height(scrollerHeight);

			this.restoreScroll();
		}
	},


	// Sets the height of just the DayGrid component in this view
	setGridHeight: function(height, isAuto) {
		if (isAuto) {
			undistributeHeight(this.dayGrid.rowEls); // let the rows be their natural height with no expanding
		}
		else {
			distributeHeight(this.dayGrid.rowEls, height, true); // true = compensate for height-hogging rows
		}
	},


	/* Events
	------------------------------------------------------------------------------------------------------------------*/


	// Renders the given events onto the view and populates the segments array
	renderEvents: function(events) {
		this.dayGrid.renderEvents(events);

		this.updateHeight(); // must compensate for events that overflow the row

		View.prototype.renderEvents.call(this, events); // call the super-method
	},


	// Retrieves all segment objects that are rendered in the view
	getSegs: function() {
		return this.dayGrid.getSegs();
	},


	// Unrenders all event elements and clears internal segment data
	destroyEvents: function() {
		View.prototype.destroyEvents.call(this); // do this before dayGrid's segs have been cleared

		this.recordScroll(); // removing events will reduce height and mess with the scroll, so record beforehand
		this.dayGrid.destroyEvents();

		// we DON'T need to call updateHeight() because:
		// A) a renderEvents() call always happens after this, which will eventually call updateHeight()
		// B) in IE8, this causes a flash whenever events are rerendered
	},


	/* Event Dragging
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of an event being dragged over the view.
	// A returned value of `true` signals that a mock "helper" event has been rendered.
	renderDrag: function(start, end, seg) {
		return this.dayGrid.renderDrag(start, end, seg);
	},


	// Unrenders the visual indication of an event being dragged over the view
	destroyDrag: function() {
		this.dayGrid.destroyDrag();
	},


	/* Selection
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of a selection
	renderSelection: function(start, end) {
		this.dayGrid.renderSelection(start, end);
	},


	// Unrenders a visual indications of a selection
	destroySelection: function() {
		this.dayGrid.destroySelection();
	}

});

;;

/* A month view with day cells running in rows (one-per-week) and columns
----------------------------------------------------------------------------------------------------------------------*/

setDefaults({
	fixedWeekCount: true
});

fcViews.month = MonthView; // register the view

function MonthView(calendar) {
	BasicView.call(this, calendar); // call the super-constructor
}


MonthView.prototype = createObject(BasicView.prototype); // define the super-class
$.extend(MonthView.prototype, {

	name: 'month',


	incrementDate: function(date, delta) {
		return date.clone().stripTime().add(delta, 'months').startOf('month');
	},


	render: function(date) {
		var rowCnt;

		this.intervalStart = date.clone().stripTime().startOf('month');
		this.intervalEnd = this.intervalStart.clone().add(1, 'months');

		this.start = this.intervalStart.clone();
		this.start = this.skipHiddenDays(this.start); // move past the first week if no visible days
		this.start.startOf('week');
		this.start = this.skipHiddenDays(this.start); // move past the first invisible days of the week

		this.end = this.intervalEnd.clone();
		this.end = this.skipHiddenDays(this.end, -1, true); // move in from the last week if no visible days
		this.end.add((7 - this.end.weekday()) % 7, 'days'); // move to end of week if not already
		this.end = this.skipHiddenDays(this.end, -1, true); // move in from the last invisible days of the week

		rowCnt = Math.ceil( // need to ceil in case there are hidden days
			this.end.diff(this.start, 'weeks', true) // returnfloat=true
		);
		if (this.isFixedWeeks()) {
			this.end.add(6 - rowCnt, 'weeks');
			rowCnt = 6;
		}

		this.title = this.calendar.formatDate(this.intervalStart, this.opt('titleFormat'));

		BasicView.prototype.render.call(this, rowCnt, this.getCellsPerWeek(), true); // call the super-method
	},


	// Overrides the default BasicView behavior to have special multi-week auto-height logic
	setGridHeight: function(height, isAuto) {

		isAuto = isAuto || this.opt('weekMode') === 'variable'; // LEGACY: weekMode is deprecated

		// if auto, make the height of each row the height that it would be if there were 6 weeks
		if (isAuto) {
			height *= this.rowCnt / 6;
		}

		distributeHeight(this.dayGrid.rowEls, height, !isAuto); // if auto, don't compensate for height-hogging rows
	},


	isFixedWeeks: function() {
		var weekMode = this.opt('weekMode'); // LEGACY: weekMode is deprecated
		if (weekMode) {
			return weekMode === 'fixed'; // if any other type of weekMode, assume NOT fixed
		}

		return this.opt('fixedWeekCount');
	}

});

;;

/* A week view with simple day cells running horizontally
----------------------------------------------------------------------------------------------------------------------*/
// TODO: a WeekView mixin for calculating dates and titles

fcViews.basicWeek = BasicWeekView; // register this view

function BasicWeekView(calendar) {
	BasicView.call(this, calendar); // call the super-constructor
}


BasicWeekView.prototype = createObject(BasicView.prototype); // define the super-class
$.extend(BasicWeekView.prototype, {

	name: 'basicWeek',


	incrementDate: function(date, delta) {
		return date.clone().stripTime().add(delta, 'weeks').startOf('week');
	},


	render: function(date) {

		this.intervalStart = date.clone().stripTime().startOf('week');
		this.intervalEnd = this.intervalStart.clone().add(1, 'weeks');

		this.start = this.skipHiddenDays(this.intervalStart);
		this.end = this.skipHiddenDays(this.intervalEnd, -1, true);

		this.title = this.calendar.formatRange(
			this.start,
			this.end.clone().subtract(1), // make inclusive by subtracting 1 ms
			this.opt('titleFormat'),
			' \u2014 ' // emphasized dash
		);

		BasicView.prototype.render.call(this, 1, this.getCellsPerWeek(), false); // call the super-method
	}
	
});
;;

/* A view with a single simple day cell
----------------------------------------------------------------------------------------------------------------------*/

fcViews.basicDay = BasicDayView; // register this view

function BasicDayView(calendar) {
	BasicView.call(this, calendar); // call the super-constructor
}


BasicDayView.prototype = createObject(BasicView.prototype); // define the super-class
$.extend(BasicDayView.prototype, {

	name: 'basicDay',


	incrementDate: function(date, delta) {
		var out = date.clone().stripTime().add(delta, 'days');
		out = this.skipHiddenDays(out, delta < 0 ? -1 : 1);
		return out;
	},


	render: function(date) {

		this.start = this.intervalStart = date.clone().stripTime();
		this.end = this.intervalEnd = this.start.clone().add(1, 'days');

		this.title = this.calendar.formatDate(this.start, this.opt('titleFormat'));

		BasicView.prototype.render.call(this, 1, 1, false); // call the super-method
	}

});
;;

/* 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.

setDefaults({
	allDaySlot: true,
	allDayText: 'all-day',

	scrollTime: '06:00:00',

	slotDuration: '00:30:00',

	axisFormat: generateAgendaAxisFormat,
	timeFormat: {
		agenda: generateAgendaTimeFormat
	},

	minTime: '00:00:00',
	maxTime: '24:00:00',
	slotEventOverlap: true
});

var AGENDA_ALL_DAY_EVENT_LIMIT = 5;


function generateAgendaAxisFormat(options, langData) {
	return langData.longDateFormat('LT')
		.replace(':mm', '(:mm)')
		.replace(/(\Wmm)$/, '($1)') // like above, but for foreign langs
		.replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
}


function generateAgendaTimeFormat(options, langData) {
	return langData.longDateFormat('LT')
		.replace(/\s*a$/i, ''); // remove trailing AM/PM
}


function AgendaView(calendar) {
	View.call(this, calendar); // call the super-constructor

	this.timeGrid = new TimeGrid(this);

	if (this.opt('allDaySlot')) { // should we display the "all-day" area?
		this.dayGrid = new DayGrid(this); // the all-day subcomponent of this view

		// the coordinate grid will be a combination of both subcomponents' grids
		this.coordMap = new ComboCoordMap([
			this.dayGrid.coordMap,
			this.timeGrid.coordMap
		]);
	}
	else {
		this.coordMap = this.timeGrid.coordMap;
	}
}


AgendaView.prototype = createObject(View.prototype); // define the super-class
$.extend(AgendaView.prototype, {

	timeGrid: null, // the main time-grid subcomponent of this view
	dayGrid: null, // the "all-day" subcomponent. if all-day is turned off, this will be null

	axisWidth: null, // the width of the time axis running down the side

	noScrollRowEls: null, // set of fake row elements that must compensate when scrollerEl has scrollbars

	// when the time-grid isn't tall enough to occupy the given height, we render an <hr> underneath
	bottomRuleEl: null,
	bottomRuleHeight: null,


	/* Rendering
	------------------------------------------------------------------------------------------------------------------*/


	// Renders the view into `this.el`, which has already been assigned.
	// `colCnt` has been calculated by a subclass and passed here.
	render: function(colCnt) {

		// needed for cell-to-date and date-to-cell calculations in View
		this.rowCnt = 1;
		this.colCnt = colCnt;

		this.el.addClass('fc-agenda-view').html(this.renderHtml());

		// the element that wraps the time-grid that will probably scroll
		this.scrollerEl = this.el.find('.fc-time-grid-container');
		this.timeGrid.coordMap.containerEl = this.scrollerEl; // don't accept clicks/etc outside of this

		this.timeGrid.el = this.el.find('.fc-time-grid');
		this.timeGrid.render();

		// the <hr> that sometimes displays under the time-grid
		this.bottomRuleEl = $('<hr class="' + this.widgetHeaderClass + '"/>')
			.appendTo(this.timeGrid.el); // inject it into the time-grid

		if (this.dayGrid) {
			this.dayGrid.el = this.el.find('.fc-day-grid');
			this.dayGrid.render();

			// have the day-grid extend it's coordinate area over the <hr> dividing the two grids
			this.dayGrid.bottomCoordPadding = this.dayGrid.el.next('hr').outerHeight();
		}

		this.noScrollRowEls = this.el.find('.fc-row:not(.fc-scroller *)'); // fake rows not within the scroller

		View.prototype.render.call(this); // call the super-method

		this.resetScroll(); // do this after sizes have been set
	},


	// Make subcomponents ready for cleanup
	destroy: function() {
		this.timeGrid.destroy();
		if (this.dayGrid) {
			this.dayGrid.destroy();
		}
		View.prototype.destroy.call(this); // call the super-method
	},


	// Builds the HTML skeleton for the view.
	// The day-grid and time-grid components will render inside containers defined by this HTML.
	renderHtml: function() {
		return '' +
			'<table>' +
				'<thead>' +
					'<tr>' +
						'<td class="' + this.widgetHeaderClass + '">' +
							this.timeGrid.headHtml() + // render the day-of-week headers
						'</td>' +
					'</tr>' +
				'</thead>' +
				'<tbody>' +
					'<tr>' +
						'<td class="' + this.widgetContentClass + '">' +
							(this.dayGrid ?
								'<div class="fc-day-grid"/>' +
								'<hr class="' + this.widgetHeaderClass + '"/>' :
								''
								) +
							'<div class="fc-time-grid-container">' +
								'<div class="fc-time-grid"/>' +
							'</div>' +
						'</td>' +
					'</tr>' +
				'</tbody>' +
			'</table>';
	},


	// Generates the HTML that will go before the day-of week header cells.
	// Queried by the TimeGrid subcomponent when generating rows. Ordering depends on isRTL.
	headIntroHtml: function() {
		var date;
		var weekNumber;
		var weekTitle;
		var weekText;

		if (this.opt('weekNumbers')) {
			date = this.cellToDate(0, 0);
			weekNumber = this.calendar.calculateWeekNumber(date);
			weekTitle = this.opt('weekNumberTitle');

			if (this.opt('isRTL')) {
				weekText = weekNumber + weekTitle;
			}
			else {
				weekText = weekTitle + weekNumber;
			}

			return '' +
				'<th class="fc-axis fc-week-number ' + this.widgetHeaderClass + '" ' + this.axisStyleAttr() + '>' +
					'<span>' + // needed for matchCellWidths
						htmlEscape(weekText) +
					'</span>' +
				'</th>';
		}
		else {
			return '<th class="fc-axis ' + this.widgetHeaderClass + '" ' + this.axisStyleAttr() + '></th>';
		}
	},


	// Generates the HTML that goes before the all-day cells.
	// Queried by the DayGrid subcomponent when generating rows. Ordering depends on isRTL.
	dayIntroHtml: function() {
		return '' +
			'<td class="fc-axis ' + this.widgetContentClass + '" ' + this.axisStyleAttr() + '>' +
				'<span>' + // needed for matchCellWidths
					(this.opt('allDayHtml') || htmlEscape(this.opt('allDayText'))) +
				'</span>' +
			'</td>';
	},


	// Generates the HTML that goes before the bg of the TimeGrid slot area. Long vertical column.
	slotBgIntroHtml: function() {
		return '<td class="fc-axis ' + this.widgetContentClass + '" ' + this.axisStyleAttr() + '></td>';
	},


	// Generates the HTML that goes before all other types of cells.
	// Affects content-skeleton, helper-skeleton, highlight-skeleton for both the time-grid and day-grid.
	// Queried by the TimeGrid and DayGrid subcomponents when generating rows. Ordering depends on isRTL.
	introHtml: function() {
		return '<td class="fc-axis" ' + this.axisStyleAttr() + '></td>';
	},


	// Generates an HTML attribute string for setting the width of the axis, if it is known
	axisStyleAttr: function() {
		if (this.axisWidth !== null) {
			 return 'style="width:' + this.axisWidth + 'px"';
		}
		return '';
	},


	/* Dimensions
	------------------------------------------------------------------------------------------------------------------*/

	updateSize: function(isResize) {
		if (isResize) {
			this.timeGrid.resize();
		}
		View.prototype.updateSize.call(this, isResize);
	},


	// Refreshes the horizontal dimensions of the view
	updateWidth: function() {
		// make all axis cells line up, and record the width so newly created axis cells will have it
		this.axisWidth = matchCellWidths(this.el.find('.fc-axis'));
	},


	// Adjusts the vertical dimensions of the view to the specified values
	setHeight: function(totalHeight, isAuto) {
		var eventLimit;
		var scrollerHeight;

		if (this.bottomRuleHeight === null) {
			// calculate the height of the rule the very first time
			this.bottomRuleHeight = this.bottomRuleEl.outerHeight();
		}
		this.bottomRuleEl.hide(); // .show() will be called later if this <hr> is necessary

		// reset all dimensions back to the original state
		this.scrollerEl.css('overflow', '');
		unsetScroller(this.scrollerEl);
		uncompensateScroll(this.noScrollRowEls);

		// limit number of events in the all-day area
		if (this.dayGrid) {
			this.dayGrid.destroySegPopover(); // kill the "more" popover if displayed

			eventLimit = this.opt('eventLimit');
			if (eventLimit && typeof eventLimit !== 'number') {
				eventLimit = AGENDA_ALL_DAY_EVENT_LIMIT; // make sure "auto" goes to a real number
			}
			if (eventLimit) {
				this.dayGrid.limitRows(eventLimit);
			}
		}

		if (!isAuto) { // should we force dimensions of the scroll container, or let the contents be natural height?

			scrollerHeight = this.computeScrollerHeight(totalHeight);
			if (setPotentialScroller(this.scrollerEl, scrollerHeight)) { // using scrollbars?

				// make the all-day and header rows lines up
				compensateScroll(this.noScrollRowEls, getScrollbarWidths(this.scrollerEl));

				// the scrollbar compensation might have changed text flow, which might affect height, so recalculate
				// and reapply the desired height to the scroller.
				scrollerHeight = this.computeScrollerHeight(totalHeight);
				this.scrollerEl.height(scrollerHeight);

				this.restoreScroll();
			}
			else { // no scrollbars
				// still, force a height and display the bottom rule (marks the end of day)
				this.scrollerEl.height(scrollerHeight).css('overflow', 'hidden'); // in case <hr> goes outside
				this.bottomRuleEl.show();
			}
		}
	},


	// Sets the scroll value of the scroller to the intial pre-configured state prior to allowing the user to change it.
	resetScroll: function() {
		var _this = this;
		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
		}

		function scroll() {
			_this.scrollerEl.scrollTop(top);
		}

		scroll();
		setTimeout(scroll, 0); // overrides any previous scroll state made by the browser
	},


	/* Events
	------------------------------------------------------------------------------------------------------------------*/


	// Renders events onto the view and populates the View's segment array
	renderEvents: function(events) {
		var dayEvents = [];
		var timedEvents = [];
		var daySegs = [];
		var timedSegs;
		var i;

		// separate the events into all-day and timed
		for (i = 0; i < events.length; i++) {
			if (events[i].allDay) {
				dayEvents.push(events[i]);
			}
			else {
				timedEvents.push(events[i]);
			}
		}

		// render the events in the subcomponents
		timedSegs = this.timeGrid.renderEvents(timedEvents);
		if (this.dayGrid) {
			daySegs = this.dayGrid.renderEvents(dayEvents);
		}

		// the all-day area is flexible and might have a lot of events, so shift the height
		this.updateHeight();

		View.prototype.renderEvents.call(this, events); // call the super-method
	},


	// Retrieves all segment objects that are rendered in the view
	getSegs: function() {
		return this.timeGrid.getSegs().concat(
			this.dayGrid ? this.dayGrid.getSegs() : []
		);
	},


	// Unrenders all event elements and clears internal segment data
	destroyEvents: function() {
		View.prototype.destroyEvents.call(this); // do this before the grids' segs have been cleared

		// if destroyEvents is being called as part of an event rerender, renderEvents will be called shortly
		// after, so remember what the scroll value was so we can restore it.
		this.recordScroll();

		// destroy the events in the subcomponents
		this.timeGrid.destroyEvents();
		if (this.dayGrid) {
			this.dayGrid.destroyEvents();
		}

		// we DON'T need to call updateHeight() because:
		// A) a renderEvents() call always happens after this, which will eventually call updateHeight()
		// B) in IE8, this causes a flash whenever events are rerendered
	},


	/* Event Dragging
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of an event being dragged over the view.
	// A returned value of `true` signals that a mock "helper" event has been rendered.
	renderDrag: function(start, end, seg) {
		if (start.hasTime()) {
			return this.timeGrid.renderDrag(start, end, seg);
		}
		else if (this.dayGrid) {
			return this.dayGrid.renderDrag(start, end, seg);
		}
	},


	// Unrenders a visual indications of an event being dragged over the view
	destroyDrag: function() {
		this.timeGrid.destroyDrag();
		if (this.dayGrid) {
			this.dayGrid.destroyDrag();
		}
	},


	/* Selection
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of a selection
	renderSelection: function(start, end) {
		if (start.hasTime() || end.hasTime()) {
			this.timeGrid.renderSelection(start, end);
		}
		else if (this.dayGrid) {
			this.dayGrid.renderSelection(start, end);
		}
	},


	// Unrenders a visual indications of a selection
	destroySelection: function() {
		this.timeGrid.destroySelection();
		if (this.dayGrid) {
			this.dayGrid.destroySelection();
		}
	}

});

;;

/* A week view with an all-day cell area at the top, and a time grid below
----------------------------------------------------------------------------------------------------------------------*/
// TODO: a WeekView mixin for calculating dates and titles

fcViews.agendaWeek = AgendaWeekView; // register the view

function AgendaWeekView(calendar) {
	AgendaView.call(this, calendar); // call the super-constructor
}


AgendaWeekView.prototype = createObject(AgendaView.prototype); // define the super-class
$.extend(AgendaWeekView.prototype, {

	name: 'agendaWeek',


	incrementDate: function(date, delta) {
		return date.clone().stripTime().add(delta, 'weeks').startOf('week');
	},


	render: function(date) {

		this.intervalStart = date.clone().stripTime().startOf('week');
		this.intervalEnd = this.intervalStart.clone().add(1, 'weeks');

		this.start = this.skipHiddenDays(this.intervalStart);
		this.end = this.skipHiddenDays(this.intervalEnd, -1, true);

		this.title = this.calendar.formatRange(
			this.start,
			this.end.clone().subtract(1), // make inclusive by subtracting 1 ms
			this.opt('titleFormat'),
			' \u2014 ' // emphasized dash
		);

		AgendaView.prototype.render.call(this, this.getCellsPerWeek()); // call the super-method
	}

});

;;

/* A day view with an all-day cell area at the top, and a time grid below
----------------------------------------------------------------------------------------------------------------------*/

fcViews.agendaDay = AgendaDayView; // register the view

function AgendaDayView(calendar) {
	AgendaView.call(this, calendar); // call the super-constructor
}


AgendaDayView.prototype = createObject(AgendaView.prototype); // define the super-class
$.extend(AgendaDayView.prototype, {

	name: 'agendaDay',


	incrementDate: function(date, delta) {
		var out = date.clone().stripTime().add(delta, 'days');
		out = this.skipHiddenDays(out, delta < 0 ? -1 : 1);
		return out;
	},


	render: function(date) {

		this.start = this.intervalStart = date.clone().stripTime();
		this.end = this.intervalEnd = this.start.clone().add(1, 'days');

		this.title = this.calendar.formatDate(this.start, this.opt('titleFormat'));

		AgendaView.prototype.render.call(this, 1); // call the super-method
	}

});

;;

});