Current File : /home/inlingua/public_html/sensoriumpsychologists.com/student/plugins/fullcalendar/fullcalendar.js
/*!

 * FullCalendar v2.2.5

 * 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 = {



	titleRangeSeparator: ' \u2014 ', // emphasized dash

	monthYearFormat: 'MMMM YYYY', // required for en. other languages rely on datepicker computable option



	defaultTimedEventDuration: '02:00:00',

	defaultAllDayEventDuration: { days: 1 },

	forceEventDuration: false,

	nextDayThreshold: '09:00:00', // 9am



	// display

	defaultView: 'month',

	aspectRatio: 1.35,

	header: {

		left: 'title',

		center: '',

		right: 'today prev,next'

	},

	weekends: true,

	weekNumbers: false,



	weekNumberTitle: 'W',

	weekNumberCalculation: 'local',

	

	//editable: false,

	

	// event ajax

	lazyFetching: true,

	startParam: 'start',

	endParam: 'end',

	timezoneParam: 'timezone',



	timezone: false,



	//allDayDefault: undefined,



	// 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 an updateSize happens

	

};





var englishDefaults = {

	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: "2.2.5" };

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 = fc.langs = {}; // initialize and expose





// TODO: document the structure and ordering of a FullCalendar lang file

// TODO: rename everything "lang" to "locale", like what the moment project did





// Initialize jQuery UI datepicker translations while using some of the translations

// Will set this as the default language for datepicker.

fc.datepickerLang = function(langCode, dpLangCode, dpOptions) {



	// get the FullCalendar internal option hash for this language. create if necessary

	var fcOptions = langOptionHash[langCode] || (langOptionHash[langCode] = {});



	// transfer some simple options from datepicker to fc

	fcOptions.isRTL = dpOptions.isRTL;

	fcOptions.weekNumberTitle = dpOptions.weekHeader;



	// compute some more complex options from datepicker

	$.each(dpComputableOptions, function(name, func) {

		fcOptions[name] = func(dpOptions);

	});



	// is jQuery UI Datepicker is on the page?

	if ($.datepicker) {



		// Register the language data.

		// FullCalendar and MomentJS use language codes like "pt-br" but Datepicker

		// does it like "pt-BR" or if it doesn't have the language, maybe just "pt".

		// Make an alias so the language can be referenced either way.

		$.datepicker.regional[dpLangCode] =

			$.datepicker.regional[langCode] = // alias

				dpOptions;



		// Alias 'en' to the default language data. Do this every time.

		$.datepicker.regional.en = $.datepicker.regional[''];



		// Set as Datepicker's global defaults.

		$.datepicker.setDefaults(dpOptions);

	}

};





// Sets FullCalendar-specific translations. Will set the language as the global default.

fc.lang = function(langCode, newFcOptions) {

	var fcOptions;

	var momOptions;



	// get the FullCalendar internal option hash for this language. create if necessary

	fcOptions = langOptionHash[langCode] || (langOptionHash[langCode] = {});



	// provided new options for this language? merge them in

	if (newFcOptions) {

		mergeOptions(fcOptions, newFcOptions);

	}



	// compute language options that weren't defined.

	// always do this. newFcOptions can be undefined when initializing from i18n file,

	// so no way to tell if this is an initialization or a default-setting.

	momOptions = getMomentLocaleData(langCode); // will fall back to en

	$.each(momComputableOptions, function(name, func) {

		if (fcOptions[name] === undefined) {

			fcOptions[name] = func(momOptions, fcOptions);

		}

	});



	// set it as the default language for FullCalendar

	defaults.lang = langCode;

};





// NOTE: can't guarantee any of these computations will run because not every language has datepicker

// configs, so make sure there are English fallbacks for these in the defaults file.

var dpComputableOptions = {



	defaultButtonText: function(dpOptions) {

		return {

			// the translations sometimes wrongly contain HTML entities

			prev: stripHtmlEntities(dpOptions.prevText),

			next: stripHtmlEntities(dpOptions.nextText),

			today: stripHtmlEntities(dpOptions.currentText)

		};

	},



	// Produces format strings like "MMMM YYYY" -> "September 2014"

	monthYearFormat: function(dpOptions) {

		return dpOptions.showMonthAfterYear ?

			'YYYY[' + dpOptions.yearSuffix + '] MMMM' :

			'MMMM YYYY[' + dpOptions.yearSuffix + ']';

	}



};



var momComputableOptions = {



	// Produces format strings like "ddd MM/DD" -> "Fri 12/10"

	dayOfMonthFormat: function(momOptions, fcOptions) {

		var format = momOptions.longDateFormat('l'); // for the format like "M/D/YYYY"



		// strip the year off the edge, as well as other misc non-whitespace chars

		format = format.replace(/^Y+[^\w\s]*|[^\w\s]*Y+$/g, '');



		if (fcOptions.isRTL) {

			format += ' ddd'; // for RTL, add day-of-week to end

		}

		else {

			format = 'ddd ' + format; // for LTR, add day-of-week to beginning

		}

		return format;

	},



	// Produces format strings like "H(:mm)a" -> "6pm" or "6:30pm"

	smallTimeFormat: function(momOptions) {

		return momOptions.longDateFormat('LT')

			.replace(':mm', '(:mm)')

			.replace(/(\Wmm)$/, '($1)') // like above, but for foreign langs

			.replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand

	},



	// Produces format strings like "H(:mm)t" -> "6p" or "6:30p"

	extraSmallTimeFormat: function(momOptions) {

		return momOptions.longDateFormat('LT')

			.replace(':mm', '(:mm)')

			.replace(/(\Wmm)$/, '($1)') // like above, but for foreign langs

			.replace(/\s*a$/i, 't'); // convert to AM/PM/am/pm to lowercase one-letter. remove any spaces beforehand

	},



	// Produces format strings like "H:mm" -> "6:30" (with no AM/PM)

	noMeridiemTimeFormat: function(momOptions) {

		return momOptions.longDateFormat('LT')

			.replace(/\s*a$/i, ''); // remove trailing AM/PM

	}



};





// Returns moment's internal locale data. If doesn't exist, returns English.

// Works with moment-pre-2.8

function getMomentLocaleData(langCode) {

	var func = moment.localeData || moment.langData;

	return func.call(moment, langCode) ||

		func.call(moment, 'en'); // the newer localData could return null, so fall back to en

}





// Initialize English by forcing computation of moment-derived options.

// Also, sets it as the default.

fc.lang('en', englishDefaults);



// exports

fc.intersectionToSeg = intersectionToSeg;

fc.applyAll = applyAll;

fc.debounce = debounce;





/* 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.

// TODO: move to date section?

function intersectionToSeg(subjectRange, constraintRange) {

	var subjectStart = subjectRange.start;

	var subjectEnd = subjectRange.end;

	var constraintStart = constraintRange.start;

	var constraintEnd = constraintRange.end;

	var segStart, segEnd;

	var isStart, isEnd;



	if (subjectEnd > constraintStart && subjectStart < constraintEnd) { // in bounds at all?



		if (subjectStart >= constraintStart) {

			segStart = subjectStart.clone();

			isStart = true;

		}

		else {

			segStart = constraintStart.clone();

			isStart =  false;

		}



		if (subjectEnd <= constraintEnd) {

			segEnd = subjectEnd.clone();

			isEnd = true;

		}

		else {

			segEnd = constraintEnd.clone();

			isEnd = false;

		}



		return {

			start: segStart,

			end: segEnd,

			isStart: isStart,

			isEnd: isEnd

		};

	}

}





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' ];

var intervalUnits = [ 'year', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond' ];





// Diffs the two moments into a Duration where full-days are recorded first, then the remaining time.

// Moments will have their timezones normalized.

function diffDayTime(a, b) {

	return moment.duration({

		days: a.clone().stripTime().diff(b.clone().stripTime(), 'days'),

		ms: a.time() - b.time() // time-of-day from day start. disregards timezone

	});

}





// Diffs the two moments via their start-of-day (regardless of timezone). Produces whole-day durations.

function diffDay(a, b) {

	return moment.duration({

		days: a.clone().stripTime().diff(b.clone().stripTime(), 'days')

	});

}





// Computes the larges whole-unit period of time, as a duration object.

// For example, 48 hours will be {days:2} whereas 49 hours will be {hours:49}.

// Accepts start/end, a range object, or an original duration object.

/* (never used)

function computeIntervalDuration(start, end) {

	var durationInput = {};

	var i, unit;

	var val;



	for (i = 0; i < intervalUnits.length; i++) {

		unit = intervalUnits[i];

		val = computeIntervalAs(unit, start, end);

		if (val) {

			break;

		}

	}



	durationInput[unit] = val;

	return moment.duration(durationInput);

}

*/





// Computes the unit name of the largest whole-unit period of time.

// For example, 48 hours will be "days" wherewas 49 hours will be "hours".

// Accepts start/end, a range object, or an original duration object.

function computeIntervalUnit(start, end) {

	var i, unit;



	for (i = 0; i < intervalUnits.length; i++) {

		unit = intervalUnits[i];

		if (computeIntervalAs(unit, start, end)) {

			break;

		}

	}



	return unit; // will be "milliseconds" if nothing else matches

}





// Computes the number of units the interval is cleanly comprised of.

// If the given unit does not cleanly divide the interval a whole number of times, `false` is returned.

// Accepts start/end, a range object, or an original duration object.

function computeIntervalAs(unit, start, end) {

	var val;



	if (end != null) { // given start, end

		val = end.diff(start, unit, true);

	}

	else if (moment.isDuration(start)) { // given duration

		val = start.as(unit);

	}

	else { // given { start, end } range object

		val = start.end.diff(start.start, unit, true);

	}



	if (val >= 1 && isInt(val)) {

		return val;

	}



	return false;

}





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

----------------------------------------------------------------------------------------------------------------------*/



var hasOwnPropMethod = {}.hasOwnProperty;





// Create an object that has the given prototype. Just like Object.create

function createObject(proto) {

	var f = function() {};

	f.prototype = proto;

	return new f();

}





function copyOwnProps(src, dest) {

	for (var name in src) {

		if (hasOwnProp(src, name)) {

			dest[name] = src[name];

		}

	}

}





function hasOwnProp(obj, name) {

	return hasOwnPropMethod.call(obj, name);

}





// Is the given value a non-object non-function value?

function isAtomic(val) {

	return /undefined|null|boolean|number|string/.test($.type(val));

}





function applyAll(functions, thisObj, args) {

	if ($.isFunction(functions)) {

		functions = [ functions ];

	}

	if (functions) {

		var i;

		var ret;

		for (i=0; i<functions.length; i++) {

			ret = functions[i].apply(thisObj, args) || ret;

		}

		return ret;

	}

}





function firstDefined() {

	for (var i=0; i<arguments.length; i++) {

		if (arguments[i] !== undefined) {

			return arguments[i];

		}

	}

}





function htmlEscape(s) {

	return (s + '').replace(/&/g, '&amp;')

		.replace(/</g, '&lt;')

		.replace(/>/g, '&gt;')

		.replace(/'/g, '&#039;')

		.replace(/"/g, '&quot;')

		.replace(/\n/g, '<br />');

}





function stripHtmlEntities(text) {

	return text.replace(/&.*?;/g, '');

}





function capitaliseFirstLetter(str) {

	return str.charAt(0).toUpperCase() + str.slice(1);

}





function compareNumbers(a, b) { // for .sort()

	return a - b;

}





function isInt(n) {

	return n % 1 === 0;

}





// Returns a function, that, as long as it continues to be invoked, will not

// be triggered. The function will be called after it stops being called for

// N milliseconds.

// https://github.com/jashkenas/underscore/blob/1.6.0/underscore.js#L714

function debounce(func, wait) {

	var timeoutId;

	var args;

	var context;

	var timestamp; // of most recent call

	var later = function() {

		var last = +new Date() - timestamp;

		if (last < wait && last > 0) {

			timeoutId = setTimeout(later, wait - last);

		}

		else {

			timeoutId = null;

			func.apply(context, args);

			if (!timeoutId) {

				context = args = null;

			}

		}

	};



	return function() {

		context = this;

		args = arguments;

		timestamp = +new Date();

		if (!timeoutId) {

			timeoutId = setTimeout(later, wait);

		}

	};

}



    var ambigDateOfMonthRegex = /^\s*\d{4}-\d\d$/;

var ambigTimeOrZoneRegex =

	/^\s*\d{4}-(?:(\d\d-\d\d)|(W\d\d$)|(W\d\d-\d)|(\d\d\d))((T| )(\d\d(:\d\d(:\d\d(\.\d+)?)?)?)?)?$/;

var newMomentProto = moment.fn; // where we will attach our new methods

var oldMomentProto = $.extend({}, newMomentProto); // copy of original moment methods

var allowValueOptimization;

var setUTCValues; // function defined below

var setLocalValues; // function defined below





// Creating

// -------------------------------------------------------------------------------------------------



// Creates a new moment, similar to the vanilla moment(...) constructor, but with

// extra features (ambiguous time, enhanced formatting). When given an existing moment,

// it will function as a clone (and retain the zone of the moment). Anything else will

// result in a moment in the local zone.

fc.moment = function() {

	return makeMoment(arguments);

};



// Sames as fc.moment, but forces the resulting moment to be in the UTC timezone.

fc.moment.utc = function() {

	var mom = makeMoment(arguments, true);



	// Force it into UTC because makeMoment doesn't guarantee it

	// (if given a pre-existing moment for example)

	if (mom.hasTime()) { // don't give ambiguously-timed moments a UTC zone

		mom.utc();

	}



	return mom;

};



// Same as fc.moment, but when given an ISO8601 string, the timezone offset is preserved.

// ISO8601 strings with no timezone offset will become ambiguously zoned.

fc.moment.parseZone = function() {

	return makeMoment(arguments, true, true);

};



// Builds an enhanced moment from args. When given an existing moment, it clones. When given a

// native Date, or called with no arguments (the current time), the resulting moment will be local.

// Anything else needs to be "parsed" (a string or an array), and will be affected by:

//    parseAsUTC - if there is no zone information, should we parse the input in UTC?

//    parseZone - if there is zone information, should we force the zone of the moment?

function makeMoment(args, parseAsUTC, parseZone) {

	var input = args[0];

	var isSingleString = args.length == 1 && typeof input === 'string';

	var isAmbigTime;

	var isAmbigZone;

	var ambigMatch;

	var mom;



	if (moment.isMoment(input)) {

		mom = moment.apply(null, args); // clone it

		transferAmbigs(input, mom); // the ambig flags weren't transfered with the clone

	}

	else if (isNativeDate(input) || input === undefined) {

		mom = moment.apply(null, args); // will be local

	}

	else { // "parsing" is required

		isAmbigTime = false;

		isAmbigZone = false;



		if (isSingleString) {

			if (ambigDateOfMonthRegex.test(input)) {

				// accept strings like '2014-05', but convert to the first of the month

				input += '-01';

				args = [ input ]; // for when we pass it on to moment's constructor

				isAmbigTime = true;

				isAmbigZone = true;

			}

			else if ((ambigMatch = ambigTimeOrZoneRegex.exec(input))) {

				isAmbigTime = !ambigMatch[5]; // no time part?

				isAmbigZone = true;

			}

		}

		else if ($.isArray(input)) {

			// arrays have no timezone information, so assume ambiguous zone

			isAmbigZone = true;

		}

		// otherwise, probably a string with a format



		if (parseAsUTC || isAmbigTime) {

			mom = moment.utc.apply(moment, args);

		}

		else {

			mom = moment.apply(null, args);

		}



		if (isAmbigTime) {

			mom._ambigTime = true;

			mom._ambigZone = true; // ambiguous time always means ambiguous zone

		}

		else if (parseZone) { // let's record the inputted zone somehow

			if (isAmbigZone) {

				mom._ambigZone = true;

			}

			else if (isSingleString) {

				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;



	if (!this._ambigTime) {



		// get the values before any conversion happens

		a = this.toArray(); // array of y/m/d/h/m/s/ms



		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, wasAmbigTime;



	if (!this._ambigZone) {



		// get the values before any conversion happens

		a = this.toArray(); // array of y/m/d/h/m/s/ms

		wasAmbigTime = this._ambigTime;



		this.utc(); // set the internal UTC flag (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.

// returns the original moments if no modifications are necessary.

function commonlyAmbiguate(inputs, preserveTime) {

	var anyAmbigTime = false;

	var anyAmbigZone = false;

	var len = inputs.length;

	var moms = [];

	var i, mom;



	// parse inputs into real moments and query their ambig flags

	for (i = 0; i < len; i++) {

		mom = inputs[i];

		if (!moment.isMoment(mom)) {

			mom = fc.moment.parseZone(mom);

		}

		anyAmbigTime = anyAmbigTime || mom._ambigTime;

		anyAmbigZone = anyAmbigZone || mom._ambigZone;

		moms.push(mom);

	}



	// strip each moment down to lowest common ambiguity

	// use clones to avoid modifying the original moments

	for (i = 0; i < len; i++) {

		mom = moms[i];

		if (!preserveTime && anyAmbigTime && !mom._ambigTime) {

			moms[i] = mom.clone().stripTime();

		}

		else if (anyAmbigZone && !mom._ambigZone) {

			moms[i] = mom.clone().stripZone();

		}

	}



	return moms;

}



// Transfers all the flags related to ambiguous time/zone from the `src` moment to the `dest` moment

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;

}



    fc.Class = Class; // export



// class that all other classes will inherit from

function Class() { }



// called upon a class to create a subclass

Class.extend = function(members) {

	var superClass = this;

	var subClass;



	members = members || {};



	// ensure a constructor for the subclass, forwarding all arguments to the super-constructor if it doesn't exist

	if (hasOwnProp(members, 'constructor')) {

		subClass = members.constructor;

	}

	if (typeof subClass !== 'function') {

		subClass = members.constructor = function() {

			superClass.apply(this, arguments);

		};

	}



	// build the base prototype for the subclass, which is an new object chained to the superclass's prototype

	subClass.prototype = createObject(superClass.prototype);



	// copy each member variable/method onto the the subclass's prototype

	copyOwnProps(members, subClass.prototype);



	// copy over all class variables/methods to the subclass, such as `extend` and `mixin`

	copyOwnProps(superClass, subClass);



	return subClass;

};



// adds new member variables/methods to the class's prototype.

// can be called with another class, or a plain object hash containing new members.

Class.mixin = function(members) {

	copyOwnProps(members.prototype || members, this.prototype);

};

    /* A rectangular panel that is absolutely positioned over other content

------------------------------------------------------------------------------------------------------------------------

Options:

	- className (string)

	- content (HTML string or jQuery element set)

	- parentEl

	- top

	- left

	- right (the x coord of where the right edge should be. not a "CSS" right)

	- autoHide (boolean)

	- show (callback)

	- hide (callback)

*/



var Popover = Class.extend({



	isHidden: true,

	options: null,

	el: null, // the container element for the popover. generated by this object

	documentMousedownProxy: null, // document mousedown handler bound to `this`

	margin: 10, // the space required between the popover and the edges of the scroll container





	constructor: function(options) {

		this.options = options || {};

	},





	// Shows the popover on the specified position. Renders it if not already

	show: function() {

		if (this.isHidden) {

			if (!this.el) {

				this.render();

			}

			this.el.show();

			this.position();

			this.isHidden = false;

			this.trigger('show');

		}

	},





	// Hides the popover, through CSS, but does not remove it from the DOM

	hide: function() {

		if (!this.isHidden) {

			this.el.hide();

			this.isHidden = true;

			this.trigger('hide');

		}

	},





	// Creates `this.el` and renders content inside of it

	render: function() {

		var _this = this;

		var options = this.options;



		this.el = $('<div class="fc-popover"/>')

			.addClass(options.className || '')

			.css({

				// position initially to the top left to avoid creating scrollbars

				top: 0,

				left: 0

			})

			.append(options.content)

			.appendTo(options.parentEl);



		// when a click happens on anything inside with a 'fc-close' className, hide the popover

		this.el.on('click', '.fc-close', function() {

			_this.hide();

		});



		if (options.autoHide) {

			$(document).on('mousedown', this.documentMousedownProxy = $.proxy(this, 'documentMousedown'));

		}

	},





	// Triggered when the user clicks *anywhere* in the document, for the autoHide feature

	documentMousedown: function(ev) {

		// only hide the popover if the click happened outside the popover

		if (this.el && !$(ev.target).closest(this.el).length) {

			this.hide();

		}

	},





	// Hides and unregisters any handlers

	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

----------------------------------------------------------------------------------------------------------------------*/



var GridCoordMap = Class.extend({



	grid: null, // reference to the Grid

	rowCoords: null, // array of {top,bottom} objects

	colCoords: null, // array of {left,right} objects



	containerEl: null, // container element that all coordinates are constrained to. optionally assigned

	minX: null,

	maxX: null, // exclusive

	minY: null,

	maxY: null, // exclusive





	constructor: function(grid) {

		this.grid = grid;

	},





	// Queries the grid for the coordinates of all the cells

	build: function() {

		this.rowCoords = this.grid.computeRowCoords();

		this.colCoords = this.grid.computeColCoords();

		this.computeBounds();

	},





	// Clears the coordinates data to free up memory

	clear: function() {

		this.rowCoords = null;

		this.colCoords = null;

	},





	// Given a coordinate of the document, gets the associated cell. If no cell is underneath, returns null

	getCell: function(x, y) {

		var rowCoords = this.rowCoords;

		var colCoords = this.colCoords;

		var hitRow = null;

		var hitCol = null;

		var i, coords;

		var cell;



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



			for (i = 0; i < rowCoords.length; i++) {

				coords = rowCoords[i];

				if (y >= coords.top && y < coords.bottom) {

					hitRow = i;

					break;

				}

			}



			for (i = 0; i < colCoords.length; i++) {

				coords = colCoords[i];

				if (x >= coords.left && x < coords.right) {

					hitCol = i;

					break;

				}

			}



			if (hitRow !== null && hitCol !== null) {

				cell = this.grid.getCell(hitRow, hitCol);

				cell.grid = this.grid; // for DragListener's isCellsEqual. dragging between grids

				return cell;

			}

		}



		return null;

	},





	// 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

----------------------------------------------------------------------------------------------------------------------*/



var ComboCoordMap = Class.extend({



	coordMaps: null, // an array of CoordMaps





	constructor: function(coordMaps) {

		this.coordMaps = coordMaps;

	},





	// Builds all coordMaps

	build: function() {

		var coordMaps = this.coordMaps;

		var i;



		for (i = 0; i < coordMaps.length; i++) {

			coordMaps[i].build();

		}

	},





	// Queries all coordMaps for the cell underneath the given coordinates, returning the first result

	getCell: function(x, y) {

		var coordMaps = this.coordMaps;

		var cell = null;

		var i;



		for (i = 0; i < coordMaps.length && !cell; i++) {

			cell = coordMaps[i].getCell(x, y);

		}



		return cell;

	},





	// Clears all coordMaps

	clear: function() {

		var coordMaps = this.coordMaps;

		var i;



		for (i = 0; i < coordMaps.length; i++) {

			coordMaps[i].clear();

		}

	}



});



    /* Tracks 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)



var DragListener = Class.extend({



	coordMap: null,

	options: null,



	isListening: false,

	isDragging: false,



	// the cell the mouse was over when listening started

	origCell: null,



	// the cell the mouse is over

	cell: 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





	constructor: function(coordMap, options) {

		this.coordMap = coordMap;

		this.options = options || {};

	},





	// 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 and its coordinates

			if (ev) {

				cell = this.getCell(ev);

				this.origCell = cell;



				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

			// especially important if no min-distance and drag starts immediately

			cell = this.getCell(ev); // this might be different from this.origCell if the min-distance is large

			if (cell) {

				this.cellOver(cell);

			}

		}

	},





	// 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.trigger('cellOver', cell, isCellsEqual(cell, this.origCell));

	},





	// Called when the mouse has just moved out of a cell

	cellOut: function() {

		if (this.cell) {

			this.trigger('cellOut', this.cell);

			this.cell = 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.coordMap.clear();

		}

	},





	// 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

----------------------------------------------------------------------------------------------------------------------*/



var MouseFollower = Class.extend({



	options: null,



	sourceEl: null, // the element that will be cloned and made to look like it is dragging

	el: null, // the clone of `sourceEl` that will track the mouse

	parentEl: null, // the element that `el` (the clone) will be attached to



	// the initial position of el, relative to the offset parent. made to match the initial offset of sourceEl

	top0: null,

	left0: null,



	// the initial position of the mouse

	mouseY0: null,

	mouseX0: null,



	// the number of pixels the mouse has moved from its initial position

	topDelta: null,

	leftDelta: null,



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



	isFollowing: false,

	isHidden: false,

	isAnimating: false, // doing the revert animation?



	constructor: function(sourceEl, options) {

		this.options = options = options || {};

		this.sourceEl = sourceEl;

		this.parentEl = options.parentEl ? $(options.parentEl) : sourceEl.parent(); // default to sourceEl's parent

	},





	// Causes the element to start following the mouse

	start: function(ev) {

		if (!this.isFollowing) {

			this.isFollowing = true;



			this.mouseY0 = ev.pageY;

			this.mouseX0 = ev.pageX;

			this.topDelta = 0;

			this.leftDelta = 0;



			if (!this.isHidden) {

				this.updatePosition();

			}



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

		}

	},





	// Causes the element to stop following the mouse. If shouldRevert is true, will animate back to original position.

	// `callback` gets invoked when the animation is complete. If no animation, it is invoked immediately.

	stop: function(shouldRevert, callback) {

		var _this = this;

		var revertDuration = this.options.revertDuration;



		function complete() {

			this.isAnimating = false;

			_this.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).



var RowRenderer = Class.extend({



	view: null, // a View object

	isRTL: null, // shortcut to the view's isRTL option

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





	constructor: function(view) {

		this.view = view;

		this.isRTL = view.opt('isRTL');

	},





	// Renders the HTML for a row, leveraging custom cell-HTML-renderers based on the `rowType`.

	// Also applies the "intro" and "outro" cells, which are specified by the subclass and views.

	// `row` is an optional row number.

	rowHtml: function(rowType, row) {

		var renderCell = this.getHtmlRenderer('cell', rowType);

		var rowCellHtml = '';

		var col;

		var cell;



		row = row || 0;



		for (col = 0; col < this.colCnt; col++) {

			cell = this.getCell(row, col);

			rowCellHtml += renderCell(cell);

		}



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



		return '<tr>' + rowCellHtml + '</tr>';

	},





	// Applies the "intro" and "outro" HTML to the given cells.

	// Intro means the leftmost cell when the calendar is LTR and the rightmost cell when RTL. Vice-versa for outro.

	// `cells` can be an HTML string of <td>'s or a jQuery <tr> element

	// `row` is an optional row number.

	bookendCells: function(cells, rowType, row) {

		var intro = this.getHtmlRenderer('intro', rowType)(row || 0);

		var outro = this.getHtmlRenderer('outro', rowType)(row || 0);

		var prependHtml = this.isRTL ? outro : intro;

		var appendHtml = this.isRTL ? intro : outro;



		if (typeof cells === 'string') {

			return prependHtml + cells + appendHtml;

		}

		else { // a jQuery <tr> element

			return cells.prepend(prependHtml).append(appendHtml);

		}

	},





	// Returns an HTML-rendering function given a specific `rendererName` (like cell, intro, or outro) and a specific

	// `rowType` (like day, eventSkeleton, helperSkeleton), which is optional.

	// If a renderer for the specific rowType doesn't exist, it will fall back to a generic renderer.

	// We will query the View object first for any custom rendering functions, then the methods of the subclass.

	getHtmlRenderer: function(rendererName, rowType) {

		var view = this.view;

		var generalName; // like "cellHtml"

		var specificName; // like "dayCellHtml". based on rowType

		var provider; // either the View or the RowRenderer subclass, whichever provided the method

		var renderer;



		generalName = rendererName + 'Html';

		if (rowType) {

			specificName = rowType + capitaliseFirstLetter(rendererName) + 'Html';

		}



		if (specificName && (renderer = view[specificName])) {

			provider = view;

		}

		else if (specificName && (renderer = this[specificName])) {

			provider = this;

		}

		else if ((renderer = view[generalName])) {

			provider = view;

		}

		else if ((renderer = this[generalName])) {

			provider = this;

		}



		if (typeof renderer === 'function') {

			return function() {

				return renderer.apply(provider, arguments) || ''; // use correct `this` and always return a string

			};

		}



		// the rendered can be a plain string as well. if not specified, always an empty string.

		return function() {

			return renderer || '';

		};

	}



});



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

----------------------------------------------------------------------------------------------------------------------*/



var Grid = fc.Grid = RowRenderer.extend({



	start: null, // the date of the first cell

	end: null, // the date after the last cell



	rowCnt: 0, // number of rows

	colCnt: 0, // number of cols

	rowData: null, // array of objects, holding misc data for each row

	colData: null, // array of objects, holding misc data for each column



	el: null, // the containing element

	coordMap: null, // a GridCoordMap that converts pixel values to datetimes

	elsByFill: null, // a hash of jQuery element sets used for rendering each fill. Keyed by fill name.



	documentDragStartProxy: null, // binds the Grid's scope to documentDragStart (in DayGrid.events)



	// derived from options

	colHeadFormat: null, // TODO: move to another class. not applicable to all Grids

	eventTimeFormat: null,

	displayEventEnd: null,





	constructor: function() {

		RowRenderer.apply(this, arguments); // call the super-constructor



		this.coordMap = new GridCoordMap(this);

		this.elsByFill = {};

		this.documentDragStartProxy = $.proxy(this, 'documentDragStart');

	},





	// 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() {

		this.unbindHandlers();

	},





	/* Options

	------------------------------------------------------------------------------------------------------------------*/





	// Generates the format string used for the text in column headers, if not explicitly defined by 'columnFormat'

	// TODO: move to another class. not applicable to all Grids

	computeColHeadFormat: function() {

		// subclasses must implement if they want to use headHtml()

	},





	// Generates the format string used for event time text, if not explicitly defined by 'timeFormat'

	computeEventTimeFormat: function() {

		return this.view.opt('smallTimeFormat');

	},





	// Determines whether events should have their end times displayed, if not explicitly defined by 'displayEventEnd'

	computeDisplayEventEnd: function() {

		return false;

	},





	/* Dates

	------------------------------------------------------------------------------------------------------------------*/





	// Tells the grid about what period of time to display. Grid will subsequently compute dates for cell system.

	setRange: function(range) {

		var view = this.view;



		this.start = range.start.clone();

		this.end = range.end.clone();



		this.rowData = [];

		this.colData = [];

		this.updateCells();



		// Populate option-derived settings. Look for override first, then compute if necessary.

		this.colHeadFormat = view.opt('columnFormat') || this.computeColHeadFormat();

		this.eventTimeFormat = view.opt('timeFormat') || this.computeEventTimeFormat();

		this.displayEventEnd = view.opt('displayEventEnd');

		if (this.displayEventEnd == null) {

			this.displayEventEnd = this.computeDisplayEventEnd();

		}

	},





	// Responsible for setting rowCnt/colCnt and any other row/col data

	updateCells: function() {

		// subclasses must implement

	},





	// Converts a range with an inclusive `start` and an exclusive `end` into an array of segment objects

	rangeToSegs: function(range) {

		// subclasses must implement

	},





	/* Cells

	------------------------------------------------------------------------------------------------------------------*/

	// NOTE: columns are ordered left-to-right





	// Gets an object containing row/col number, misc data, and range information about the cell.

	// Accepts row/col values, an object with row/col properties, or a single-number offset from the first cell.

	getCell: function(row, col) {

		var cell;



		if (col == null) {

			if (typeof row === 'number') { // a single-number offset

				col = row % this.colCnt;

				row = Math.floor(row / this.colCnt);

			}

			else { // an object with row/col properties

				col = row.col;

				row = row.row;

			}

		}



		cell = { row: row, col: col };



		$.extend(cell, this.getRowData(row), this.getColData(col));

		$.extend(cell, this.computeCellRange(cell));



		return cell;

	},





	// Given a cell object with index and misc data, generates a range object

	computeCellRange: function(cell) {

		// subclasses must implement

	},





	// Retrieves misc data about the given row

	getRowData: function(row) {

		return this.rowData[row] || {};

	},





	// Retrieves misc data baout the given column

	getColData: function(col) {

		return this.colData[col] || {};

	},





	// Retrieves the element representing the given row

	getRowEl: function(row) {

		// subclasses should implement if leveraging the default getCellDayEl() or computeRowCoords()

	},





	// Retrieves the element representing the given column

	getColEl: function(col) {

		// subclasses should implement if leveraging the default getCellDayEl() or computeColCoords()

	},





	// Given a cell object, returns the element that represents the cell's whole-day

	getCellDayEl: function(cell) {

		return this.getColEl(cell.col) || this.getRowEl(cell.row);

	},





	/* Cell Coordinates

	------------------------------------------------------------------------------------------------------------------*/





	// Computes the top/bottom coordinates of all rows.

	// By default, queries the dimensions of the element provided by getRowEl().

	computeRowCoords: function() {

		var items = [];

		var i, el;

		var item;



		for (i = 0; i < this.rowCnt; i++) {

			el = this.getRowEl(i);

			item = {

				top: el.offset().top

			};

			if (i > 0) {

				items[i - 1].bottom = item.top;

			}

			items.push(item);

		}

		item.bottom = item.top + el.outerHeight();



		return items;

	},





	// Computes the left/right coordinates of all rows.

	// By default, queries the dimensions of the element provided by getColEl().

	computeColCoords: function() {

		var items = [];

		var i, el;

		var item;



		for (i = 0; i < this.colCnt; i++) {

			el = this.getColEl(i);

			item = {

				left: el.offset().left

			};

			if (i > 0) {

				items[i - 1].right = item.left;

			}

			items.push(item);

		}

		item.right = item.left + el.outerWidth();



		return items;

	},





	/* Handlers

	------------------------------------------------------------------------------------------------------------------*/





	// Attaches handlers to DOM

	bindHandlers: function() {

		var _this = this;



		// attach a handler to the grid's root element.

		// we don't need to clean up in unbindHandlers or destroy, because when jQuery removes the element from the

		// DOM it automatically unregisters the handlers.

		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);

			}

		});



		// attach event-element-related handlers. in Grid.events

		// same garbage collection note as above.

		this.bindSegHandlers();



		$(document).on('dragstart', this.documentDragStartProxy); // jqui drag

	},





	// Unattaches handlers from the DOM

	unbindHandlers: function() {

		$(document).off('dragstart', this.documentDragStartProxy); // jqui drag

	},





	// Process a mousedown on an element that represents a day. For day clicking and selecting.

	dayMousedown: function(ev) {

		var _this = this;

		var view = this.view;

		var isSelectable = view.opt('selectable');

		var dayClickCell; // null if invalid dayClick

		var selectionRange; // null if invalid selection



		// this listener tracks a mousedown on a day element, and a subsequent drag.

		// if the drag ends on the same day, it is a 'dayClick'.

		// if 'selectable' is enabled, this listener also detects selections.

		var dragListener = new 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, isOrig) {

				var origCell = dragListener.origCell;

				if (origCell) { // click needs to have started on a cell

					dayClickCell = isOrig ? cell : null; // single-cell selection is a day click

					if (isSelectable) {

						selectionRange = _this.computeSelection(origCell, cell);

						if (selectionRange) {

							_this.renderSelection(selectionRange);

						}

						else {

							disableCursor();

						}

					}

				}

			},

			cellOut: function(cell) {

				dayClickCell = null;

				selectionRange = null;

				_this.destroySelection();

				enableCursor();

			},

			listenStop: function(ev) {

				if (dayClickCell) {

					view.trigger('dayClick', _this.getCellDayEl(dayClickCell), dayClickCell.start, ev);

				}

				if (selectionRange) {

					// the selection will already have been rendered. just report it

					view.reportSelection(selectionRange, ev);

				}

				enableCursor();

			}

		});



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

	},





	/* Event Helper

	------------------------------------------------------------------------------------------------------------------*/

	// TODO: should probably move this to Grid.events, like we did event dragging / resizing





	// Renders a mock event over the given range.

	// The range's end can be null, in which case the mock event that is rendered will have a null end time.

	// `sourceSeg` is the internal segment object involved in the drag. If null, something external is dragging.

	renderRangeHelper: function(range, sourceSeg) {

		var fakeEvent;



		fakeEvent = sourceSeg ? createObject(sourceSeg.event) : {}; // mask the original event object if possible

		fakeEvent.start = range.start.clone();

		fakeEvent.end = range.end ? range.end.clone() : null;

		fakeEvent.allDay = null; // force it to be freshly computed by normalizeEventDateProps

		this.view.calendar.normalizeEventDateProps(fakeEvent);



		// this extra className will be useful for differentiating real events from mock events in CSS

		fakeEvent.className = (fakeEvent.className || []).concat('fc-helper');



		// if something external is being dragged in, don't render a resizer

		if (!sourceSeg) {

			fakeEvent.editable = false;

		}



		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(range) {

		this.renderHighlight(range);

	},





	// Unrenders any visual indications of a selection. Will unrender a highlight by default.

	destroySelection: function() {

		this.destroyHighlight();

	},





	// Given the first and last cells of a selection, returns a range object.

	// Will return something falsy if the selection is invalid (when outside of selectionConstraint for example).

	// Subclasses can override and provide additional data in the range object. Will be passed to renderSelection().

	computeSelection: function(firstCell, lastCell) {

		var dates = [

			firstCell.start,

			firstCell.end,

			lastCell.start,

			lastCell.end

		];

		var range;



		dates.sort(compareNumbers); // sorts chronologically. works with Moments



		range = {

			start: dates[0].clone(),

			end: dates[3].clone()

		};



		if (!this.view.calendar.isSelectionRangeAllowed(range)) {

			return null;

		}



		return range;

	},





	/* Highlight

	------------------------------------------------------------------------------------------------------------------*/





	// Renders an emphasis on the given date range. `start` is inclusive. `end` is exclusive.

	renderHighlight: function(range) {

		this.renderFill('highlight', this.rangeToSegs(range));

	},





	// 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. TODO: better API for expressing this requirement

	renderFill: function(type, segs) {

		// subclasses must implement

	},





	// Unrenders a specific type of fill that is currently rendered on the grid

	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.

	// TODO: move to another class. not applicable to all Grids

	headHtml: function() {

		return '' +

			'<div class="fc-row ' + this.view.widgetHeaderClass + '">' +

				'<table>' +

					'<thead>' +

						this.rowHtml('head') + // leverages RowRenderer

					'</thead>' +

				'</table>' +

			'</div>';

	},





	// Used by the `headHtml` method, via RowRenderer, for rendering the HTML of a day-of-week header cell

	// TODO: move to another class. not applicable to all Grids

	headCellHtml: function(cell) {

		var view = this.view;

		var date = cell.start;



		return '' +

			'<th class="fc-day-header ' + view.widgetHeaderClass + ' fc-' + dayIDs[date.day()] + '">' +

				htmlEscape(date.format(this.colHeadFormat)) +

			'</th>';

	},





	// Renders the HTML for a single-day background cell

	bgCellHtml: function(cell) {

		var view = this.view;

		var date = cell.start;

		var classes = this.getDayClasses(date);



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



		return '<td class="' + classes.join(' ') + '"' +

			' data-date="' + date.format('YYYY-MM-DD') + '"' + // if date has a time, won't format it

			'></td>';

	},





	// Computes HTML classNames for a single-day cell

	getDayClasses: function(date) {

		var view = this.view;

		var today = view.calendar.getNow().stripTime();

		var classes = [ 'fc-' + dayIDs[date.day()] ];



		if (

			view.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

----------------------------------------------------------------------------------------------------------------------*/



Grid.mixin({



	mousedOverSeg: null, // the segment object the user's mouse is over. null if over nothing

	isDraggingSeg: false, // is a segment being dragged? boolean

	isResizingSeg: false, // is a segment being resized? boolean

	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

	getEventSegs: function() {

		return this.segs || [];

	},





	/* Foreground Segment Rendering

	------------------------------------------------------------------------------------------------------------------*/





	// Renders foreground event segments onto the grid. May return a subset of segs that were rendered.

	renderFgSegs: function(segs) {

		// subclasses must implement

	},





	// Unrenders all currently rendered foreground segments

	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);

		}

	},





	/* Event Dragging

	------------------------------------------------------------------------------------------------------------------*/





	// Called when the user does a mousedown on an event, which might lead to dragging.

	// Generic enough to work with any type of Grid.

	segDragMousedown: function(seg, ev) {

		var _this = this;

		var view = this.view;

		var el = seg.el;

		var event = seg.event;

		var dropLocation;



		// A clone of the original element that will move with the mouse

		var mouseFollower = new MouseFollower(seg.el, {

			parentEl: view.el,

			opacity: view.opt('dragOpacity'),

			revertDuration: view.opt('dragRevertDuration'),

			zIndex: 2 // one above the .fc-view

		});



		// Tracks mouse movement over the *view's* coordinate map. Allows dragging and dropping between subcomponents

		// of the view.

		var dragListener = new 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, isOrig) {

				var origCell = seg.cell || dragListener.origCell; // starting cell could be forced (DayGrid.limit)



				dropLocation = _this.computeEventDrop(origCell, cell, event);

				if (dropLocation) {

					if (view.renderDrag(dropLocation, seg)) { // have the subclass render a visual indication

						mouseFollower.hide(); // if the subclass is already using a mock event "helper", hide our own

					}

					else {

						mouseFollower.show();

					}

					if (isOrig) {

						dropLocation = null; // needs to have moved cells to be a valid drop

					}

				}

				else {

					// have the helper follow the mouse (no snapping) with a warning-style cursor

					mouseFollower.show();

					disableCursor();

				}

			},

			cellOut: function() { // called before mouse moves to a different cell OR moved out of all cells

				dropLocation = null;

				view.destroyDrag(); // unrender whatever was done in renderDrag

				mouseFollower.show(); // show in case we are moving out of all cells

				enableCursor();

			},

			dragStop: function(ev) {

				// do revert animation if hasn't changed. calls a callback when finished (whether animation or not)

				mouseFollower.stop(!dropLocation, function() {

					_this.isDraggingSeg = false;

					view.destroyDrag();

					view.showEvent(event);

					view.trigger('eventDragStop', el[0], event, ev, {}); // last argument is jqui dummy



					if (dropLocation) {

						view.reportEventDrop(event, dropLocation, el, ev);

					}

				});

				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 the cell an event drag began, and the cell event was dropped, calculates the new start/end/allDay

	// values for the event. Subclasses may override and set additional properties to be used by renderDrag.

	// A falsy returned value indicates an invalid drop.

	computeEventDrop: function(startCell, endCell, event) {

		var dragStart = startCell.start;

		var dragEnd = endCell.start;

		var delta;

		var newStart;

		var newEnd;

		var newAllDay;

		var dropLocation;



		if (dragStart.hasTime() === dragEnd.hasTime()) {

			delta = diffDayTime(dragEnd, dragStart);

			newStart = event.start.clone().add(delta);

			if (event.end === null) { // do we need to compute an end?

				newEnd = null;

			}

			else {

				newEnd = event.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 = dragEnd.clone();

			newEnd = null; // end should be cleared

			newAllDay = !dragEnd.hasTime();

		}



		dropLocation = {

			start: newStart,

			end: newEnd,

			allDay: newAllDay

		};



		if (!this.view.calendar.isEventRangeAllowed(dropLocation, event)) {

			return null;

		}



		return dropLocation;

	},





	/* External Element Dragging

	------------------------------------------------------------------------------------------------------------------*/





	// Called when a jQuery UI drag is initiated anywhere in the DOM

	documentDragStart: function(ev, ui) {

		var view = this.view;

		var el;

		var accept;



		if (view.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 = view.opt('dropAccept');

			if ($.isFunction(accept) ? accept.call(el[0], el) : el.is(accept)) {



				this.startExternalDrag(el, ev, ui);

			}

		}

	},





	// Called when a jQuery UI drag starts and it needs to be monitored for cell dropping

	startExternalDrag: function(el, ev, ui) {

		var _this = this;

		var meta = getDraggedElMeta(el); // extra data about event drop, including possible event to create

		var dragListener;

		var dropLocation; // a null value signals an unsuccessful drag



		// listener that tracks mouse movement over date-associated pixel regions

		dragListener = new DragListener(this.coordMap, {

			cellOver: function(cell) {

				dropLocation = _this.computeExternalDrop(cell, meta);

				if (dropLocation) {

					_this.renderDrag(dropLocation); // called without a seg parameter

				}

				else { // invalid drop cell

					disableCursor();

				}

			},

			cellOut: function() {

				dropLocation = null; // signal unsuccessful

				_this.destroyDrag();

				enableCursor();

			}

		});



		// gets called, only once, when jqui drag is finished

		$(document).one('dragstop', function(ev, ui) {

			_this.destroyDrag();

			enableCursor();



			if (dropLocation) { // element was dropped on a valid date/time cell

				_this.view.reportExternalDrop(meta, dropLocation, el, ev, ui);

			}

		});



		dragListener.startDrag(ev); // start listening immediately

	},





	// Given a cell to be dropped upon, and misc data associated with the jqui drag (guaranteed to be a plain object),

	// returns start/end dates for the event that would result from the hypothetical drop. end might be null.

	// Returning a null value signals an invalid drop cell.

	computeExternalDrop: function(cell, meta) {

		var dropLocation = {

			start: cell.start.clone(),

			end: null

		};



		// if dropped on an all-day cell, and element's metadata specified a time, set it

		if (meta.startTime && !dropLocation.start.hasTime()) {

			dropLocation.start.time(meta.startTime);

		}



		if (meta.duration) {

			dropLocation.end = dropLocation.start.clone().add(meta.duration);

		}



		if (!this.view.calendar.isExternalDropRangeAllowed(dropLocation, meta.eventProps)) {

			return null;

		}



		return dropLocation;

	},







	/* Drag Rendering (for both events and an external elements)

	------------------------------------------------------------------------------------------------------------------*/





	// Renders a visual indication of an event or external element being dragged.

	// `dropLocation` contains hypothetical start/end/allDay values the event would have if dropped. end can be null.

	// `seg` is the internal segment object that is being dragged. If dragging an external element, `seg` is null.

	// A truthy returned value indicates this method has rendered a helper element.

	renderDrag: function(dropLocation, seg) {

		// subclasses must implement

	},





	// Unrenders a visual indication of an event or external element being dragged

	destroyDrag: function() {

		// subclasses must implement

	},





	/* Resizing

	------------------------------------------------------------------------------------------------------------------*/





	// Called when the user does a mousedown on an event's resizer, which might lead to resizing.

	// Generic enough to work with any type of Grid.

	segResizeMousedown: function(seg, ev) {

		var _this = this;

		var view = this.view;

		var calendar = view.calendar;

		var el = seg.el;

		var event = seg.event;

		var start = event.start;

		var oldEnd = calendar.getEventEnd(event);

		var newEnd; // falsy if invalid resize

		var dragListener;



		function destroy() { // resets the rendering to show the original event

			_this.destroyEventResize();

			view.showEvent(event);

			enableCursor();

		}



		// 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) {

				newEnd = cell.end;



				if (!newEnd.isAfter(start)) { // was end moved before start?

					newEnd = start.clone().add( // make the event span a single slot

						diffDayTime(cell.end, cell.start) // assumes all slot durations are the same

					);

				}



				if (newEnd.isSame(oldEnd)) {

					newEnd = null;

				}

				else if (!calendar.isEventRangeAllowed({ start: start, end: newEnd }, event)) {

					newEnd = null;

					disableCursor();

				}

				else {

					_this.renderEventResize({ start: start, end: newEnd }, seg);

					view.hideEvent(event);

				}

			},

			cellOut: function() { // called before mouse moves to a different cell OR moved out of all cells

				newEnd = null;

				destroy();

			},

			dragStop: function(ev) {

				_this.isResizingSeg = false;

				destroy();

				view.trigger('eventResizeStop', el[0], event, ev, {}); // last argument is jqui dummy



				if (newEnd) { // valid date to resize to?

					view.reportEventResize(event, newEnd, el, ev);

				}

			}

		});



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

	},





	// Renders a visual indication of an event being resized.

	// `range` has the updated dates of the event. `seg` is the original segment object involved in the drag.

	renderEventResize: function(range, seg) {

		// subclasses must implement

	},





	// Unrenders a visual indication of an event being resized.

	destroyEventResize: function() {

		// subclasses must implement

	},





	/* Rendering Utils

	------------------------------------------------------------------------------------------------------------------*/





	// Compute the text that should be displayed on an event's element.

	// `range` can be the Event object itself, or something range-like, with at least a `start`.

	// The `timeFormat` options and the grid's default format is used, but `formatStr` can override.

	getEventTimeText: function(range, formatStr) {



		formatStr = formatStr || this.eventTimeFormat;



		if (range.end && this.displayEventEnd) {

			return this.view.formatRange(range, formatStr);

		}

		else {

			return range.start.format(formatStr);

		}

	},





	// 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);

		}

		else {

			segs = this.rangeToSegs(eventRange); // defined by the subclass

		}



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

			seg = segs[i];

			seg.event = eventRange.event;

			seg.eventStartMS = eventRange.eventStartMS;

			seg.eventDurationMS = eventRange.eventDurationMS;

		}



		return segs;

	}



});





/* 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

}



fc.compareSegs = compareSegs; // export





/* External-Dragging-Element Data

----------------------------------------------------------------------------------------------------------------------*/



// Require all HTML5 data-* attributes used by FullCalendar to have this prefix.

// A value of '' will query attributes like data-event. A value of 'fc' will query attributes like data-fc-event.

fc.dataAttrPrefix = '';



// Given a jQuery element that might represent a dragged FullCalendar event, returns an intermediate data structure

// to be used for Event Object creation.

// A defined `.eventProps`, even when empty, indicates that an event should be created.

function getDraggedElMeta(el) {

	var prefix = fc.dataAttrPrefix;

	var eventProps; // properties for creating the event, not related to date/time

	var startTime; // a Duration

	var duration;

	var stick;



	if (prefix) { prefix += '-'; }

	eventProps = el.data(prefix + 'event') || null;



	if (eventProps) {

		if (typeof eventProps === 'object') {

			eventProps = $.extend({}, eventProps); // make a copy

		}

		else { // something like 1 or true. still signal event creation

			eventProps = {};

		}



		// pluck special-cased date/time properties

		startTime = eventProps.start;

		if (startTime == null) { startTime = eventProps.time; } // accept 'time' as well

		duration = eventProps.duration;

		stick = eventProps.stick;

		delete eventProps.start;

		delete eventProps.time;

		delete eventProps.duration;

		delete eventProps.stick;

	}



	// fallback to standalone attribute values for each of the date/time properties

	if (startTime == null) { startTime = el.data(prefix + 'start'); }

	if (startTime == null) { startTime = el.data(prefix + 'time'); } // accept 'time' as well

	if (duration == null) { duration = el.data(prefix + 'duration'); }

	if (stick == null) { stick = el.data(prefix + 'stick'); }



	// massage into correct data types

	startTime = startTime != null ? moment.duration(startTime) : null;

	duration = duration != null ? moment.duration(duration) : null;

	stick = Boolean(stick);



	return { eventProps: eventProps, startTime: startTime, duration: duration, stick: stick };

}





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

----------------------------------------------------------------------------------------------------------------------*/



var DayGrid = Grid.extend({



	numbersVisible: false, // should render a row for day/week numbers? set by outside view. TODO: make internal

	bottomCoordPadding: 0, // hack for extending the hit area for the last row of the coordinate grid

	breakOnWeeks: null, // should create a new row for each week? set by outside view



	cellDates: null, // flat chronological array of each cell's dates

	dayToCellOffsets: null, // maps days offsets from grid's start date, to cell offsets



	rowEls: null, // set of fake row elements

	dayEls: null, // set of whole-day elements comprising the row's background

	helperEls: null, // set of cell skeleton elements for rendering the mock event "helper"





	// 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 rowCnt = this.rowCnt;

		var colCnt = this.colCnt;

		var cellCnt = rowCnt * colCnt;

		var html = '';

		var row;

		var i, cell;



		for (row = 0; row < rowCnt; row++) {

			html += this.dayRowHtml(row, isRigid);

		}

		this.el.html(html);



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

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



		// trigger dayRender with each cell's element

		for (i = 0; i < cellCnt; i++) {

			cell = this.getCell(i);

			view.trigger('dayRender', null, cell.start, this.dayEls.eq(i));

		}



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

	},





	destroy: function() {

		this.destroySegPopover();

		Grid.prototype.destroy.call(this); // call the super-method

	},





	// Generates the HTML for a single row. `row` is the row number.

	dayRowHtml: function(row, isRigid) {

		var view = this.view;

		var classes = [ 'fc-row', 'fc-week', view.widgetContentClass ];



		if (isRigid) {

			classes.push('fc-rigid');

		}



		return '' +

			'<div class="' + classes.join(' ') + '">' +

				'<div class="fc-bg">' +

					'<table>' +

						this.rowHtml('day', row) + // leverages RowRenderer. calls dayCellHtml()

					'</table>' +

				'</div>' +

				'<div class="fc-content-skeleton">' +

					'<table>' +

						(this.numbersVisible ?

							'<thead>' +

								this.rowHtml('number', row) + // leverages RowRenderer. View will define render method

							'</thead>' :

							''

							) +

					'</table>' +

				'</div>' +

			'</div>';

	},





	// Renders the HTML for a whole-day cell. Will eventually end up in the day-row's background.

	// We go through a 'day' row type instead of just doing a 'bg' row type so that the View can do custom rendering

	// specifically for whole-day rows, whereas a 'bg' might also be used for other purposes (TimeGrid bg for example).

	dayCellHtml: function(cell) {

		return this.bgCellHtml(cell);

	},





	/* Options

	------------------------------------------------------------------------------------------------------------------*/





	// Computes a default column header formatting string if `colFormat` is not explicitly defined

	computeColHeadFormat: function() {

		if (this.rowCnt > 1) { // more than one week row. day numbers will be in each cell

			return 'ddd'; // "Sat"

		}

		else if (this.colCnt > 1) { // multiple days, so full single date string WON'T be in title text

			return this.view.opt('dayOfMonthFormat'); // "Sat 12/10"

		}

		else { // single day, so full single date string will probably be in title text

			return 'dddd'; // "Saturday"

		}

	},





	// Computes a default event time formatting string if `timeFormat` is not explicitly defined

	computeEventTimeFormat: function() {

		return this.view.opt('extraSmallTimeFormat'); // like "6p" or "6:30p"

	},





	// Computes a default `displayEventEnd` value if one is not expliclty defined

	computeDisplayEventEnd: function() {

		return this.colCnt == 1; // we'll likely have space if there's only one day

	},





	/* Cell System

	------------------------------------------------------------------------------------------------------------------*/





	// Initializes row/col information

	updateCells: function() {

		var cellDates;

		var firstDay;

		var rowCnt;

		var colCnt;



		this.updateCellDates(); // populates cellDates and dayToCellOffsets

		cellDates = this.cellDates;



		if (this.breakOnWeeks) {

			// count columns until the day-of-week repeats

			firstDay = cellDates[0].day();

			for (colCnt = 1; colCnt < cellDates.length; colCnt++) {

				if (cellDates[colCnt].day() == firstDay) {

					break;

				}

			}

			rowCnt = Math.ceil(cellDates.length / colCnt);

		}

		else {

			rowCnt = 1;

			colCnt = cellDates.length;

		}



		this.rowCnt = rowCnt;

		this.colCnt = colCnt;

	},





	// Populates cellDates and dayToCellOffsets

	updateCellDates: function() {

		var view = this.view;

		var date = this.start.clone();

		var dates = [];

		var offset = -1;

		var offsets = [];



		while (date.isBefore(this.end)) { // loop each day from start to end

			if (view.isHiddenDay(date)) {

				offsets.push(offset + 0.5); // mark that it's between offsets

			}

			else {

				offset++;

				offsets.push(offset);

				dates.push(date.clone());

			}

			date.add(1, 'days');

		}



		this.cellDates = dates;

		this.dayToCellOffsets = offsets;

	},





	// Given a cell object, generates a range object

	computeCellRange: function(cell) {

		var colCnt = this.colCnt;

		var index = cell.row * colCnt + (this.isRTL ? colCnt - cell.col - 1 : cell.col);

		var start = this.cellDates[index].clone();

		var end = start.clone().add(1, 'day');



		return { start: start, end: end };

	},





	// Retrieves the element representing the given row

	getRowEl: function(row) {

		return this.rowEls.eq(row);

	},





	// Retrieves the element representing the given column

	getColEl: function(col) {

		return this.dayEls.eq(col);

	},





	// Gets the whole-day element associated with the cell

	getCellDayEl: function(cell) {

		return this.dayEls.eq(cell.row * this.colCnt + cell.col);

	},





	// Overrides Grid's method for when row coordinates are computed

	computeRowCoords: function() {

		var rowCoords = Grid.prototype.computeRowCoords.call(this); // call the super-method



		// hack for extending last row (used by AgendaView)

		rowCoords[rowCoords.length - 1].bottom += this.bottomCoordPadding;



		return rowCoords;

	},





	/* Dates

	------------------------------------------------------------------------------------------------------------------*/





	// Slices up a date range by row into an array of segments

	rangeToSegs: function(range) {

		var isRTL = this.isRTL;

		var rowCnt = this.rowCnt;

		var colCnt = this.colCnt;

		var segs = [];

		var first, last; // inclusive cell-offset range for given range

		var row;

		var rowFirst, rowLast; // inclusive cell-offset range for current row

		var isStart, isEnd;

		var segFirst, segLast; // inclusive cell-offset range for segment

		var seg;



		range = this.view.computeDayRange(range); // make whole-day range, considering nextDayThreshold

		first = this.dateToCellOffset(range.start);

		last = this.dateToCellOffset(range.end.subtract(1, 'days')); // offset of inclusive end date



		for (row = 0; row < rowCnt; row++) {

			rowFirst = row * colCnt;

			rowLast = rowFirst + colCnt - 1;



			// intersect segment's offset range with the row's

			segFirst = Math.max(rowFirst, first);

			segLast = Math.min(rowLast, last);



			// deal with in-between indices

			segFirst = Math.ceil(segFirst); // in-between starts round to next cell

			segLast = Math.floor(segLast); // in-between ends round to prev cell



			if (segFirst <= segLast) { // was there any intersection with the current row?



				// must be matching integers to be the segment's start/end

				isStart = segFirst === first;

				isEnd = segLast === last;



				// translate offsets to be relative to start-of-row

				segFirst -= rowFirst;

				segLast -= rowFirst;



				seg = { row: row, isStart: isStart, isEnd: isEnd };

				if (isRTL) {

					seg.leftCol = colCnt - segLast - 1;

					seg.rightCol = colCnt - segFirst - 1;

				}

				else {

					seg.leftCol = segFirst;

					seg.rightCol = segLast;

				}

				segs.push(seg);

			}

		}



		return segs;

	},





	// Given a date, returns its chronolocial cell-offset from the first cell of the grid.

	// If the date lies between cells (because of hiddenDays), returns a floating-point value between offsets.

	// If before the first offset, returns a negative number.

	// If after the last offset, returns an offset past the last cell offset.

	// Only works for *start* dates of cells. Will not work for exclusive end dates for cells.

	dateToCellOffset: function(date) {

		var offsets = this.dayToCellOffsets;

		var day = date.diff(this.start, 'days');



		if (day < 0) {

			return offsets[0] - 1;

		}

		else if (day >= offsets.length) {

			return offsets[offsets.length - 1] + 1;

		}

		else {

			return offsets[day];

		}

	},





	/* Event Drag Visualization

	------------------------------------------------------------------------------------------------------------------*/

	// TODO: move to DayGrid.event, similar to what we did with Grid's drag methods





	// Renders a visual indication of an event or external element being dragged.

	// The dropLocation's end can be null. seg can be null. See Grid::renderDrag for more info.

	renderDrag: function(dropLocation, seg) {

		var opacity;



		// always render a highlight underneath

		this.renderHighlight(

			this.view.calendar.ensureVisibleEventRange(dropLocation) // needs to be a proper range

		);



		// if a segment from the same calendar but another component is being dragged, render a helper event

		if (seg && !seg.el.closest(this.el).length) {



			this.renderRangeHelper(dropLocation, seg);



			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

	renderEventResize: function(range, seg) {

		this.renderHighlight(range);

		this.renderRangeHelper(range, seg);

	},





	// Unrenders a visual indication of an event being resized

	destroyEventResize: 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.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

----------------------------------------------------------------------------------------------------------------------*/



DayGrid.mixin({



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





	// Unrenders all events currently rendered on the grid

	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

	getEventSegs: function() {

		return Grid.prototype.getEventSegs.call(this) // get the segments from the super-method

			.concat(this.popoverSegs || []); // append the segments from the "more..." popover

	},





	// Renders the given background event segments onto the grid

	renderBgSegs: function(segs) {



		// don't render timed background events

		var allDaySegs = $.grep(segs, function(seg) {

			return seg.event.allDay;

		});



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

	},





	// Renders the given foreground event segments onto the grid

	renderFgSegs: function(segs) {

		var rowStructs;



		// render an `.el` on each seg

		// returns a subset of the segs. segs that were actually rendered

		segs = this.renderFgSegEls(segs);



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



		// append to each row's content skeleton

		this.rowEls.each(function(i, rowNode) {

			$(rowNode).find('.fc-content-skeleton > table').append(

				rowStructs[i].tbodyEl

			);

		});



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

	},





	// Unrenders all currently rendered foreground event segments

	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 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(this.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">' +

					(this.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 colCnt = this.colCnt;

		var segLevels = this.buildSegLevels(rowSegs); // group into sub-arrays of levels

		var levelCnt = Math.max(1, segLevels.length); // ensure at least one level

		var tbody = $('<tbody/>');

		var segMatrix = []; // lookup for which segments are rendered into which level+col cells

		var cellMatrix = []; // lookup for all <td> elements of the level+col matrix

		var loneCellMatrix = []; // lookup for <td> elements that only take up a single column

		var i, levelSegs;

		var col;

		var tr;

		var j, seg;

		var td;



		// populates empty cells from the current column (`col`) to `endCol`

		function emptyCellsUntil(endCol) {

			while (col < endCol) {

				// try to grab a cell from the level above and extend its rowspan. otherwise, create a fresh cell

				td = (loneCellMatrix[i - 1] || [])[col];

				if (td) {

					td.attr(

						'rowspan',

						parseInt(td.attr('rowspan') || 1, 10) + 1

					);

				}

				else {

					td = $('<td/>');

					tr.append(td);

				}

				cellMatrix[i][col] = td;

				loneCellMatrix[i][col] = td;

				col++;

			}

		}



		for (i = 0; i < levelCnt; i++) { // iterate through all levels

			levelSegs = segLevels[i];

			col = 0;

			tr = $('<tr/>');



			segMatrix.push([]);

			cellMatrix.push([]);

			loneCellMatrix.push([]);



			// levelCnt might be 1 even though there are no actual levels. protect against this.

			// this single empty row is useful for styling.

			if (levelSegs) {

				for (j = 0; j < levelSegs.length; j++) { // iterate through segments in level

					seg = levelSegs[j];



					emptyCellsUntil(seg.leftCol);



					// create a container that occupies or more columns. append the event element.

					td = $('<td class="fc-event-container"/>').append(seg.el);

					if (seg.leftCol != seg.rightCol) {

						td.attr('colspan', seg.rightCol - seg.leftCol + 1);

					}

					else { // a single-column segment

						loneCellMatrix[i][col] = td;

					}



					while (col <= seg.rightCol) {

						cellMatrix[i][col] = td;

						segMatrix[i][col] = seg;

						col++;

					}



					tr.append(td);

				}

			}



			emptyCellsUntil(colCnt); // finish off the row

			this.bookendCells(tr, 'eventSkeleton');

			tbody.append(tr);

		}



		return { // a "rowStruct"

			row: row, // the row number

			tbodyEl: tbody,

			cellMatrix: cellMatrix,

			segMatrix: segMatrix,

			segLevels: segLevels,

			segs: rowSegs

		};

	},





	// Stacks a flat array of segments, which are all assumed to be in the same row, into subarrays of vertical levels.

	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 segRows = [];

		var i;



		for (i = 0; i < this.rowCnt; i++) {

			segRows.push([]);

		}



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

			segRows[segs[i].row].push(segs[i]);

		}



		return segRows;

	}



});





// Computes whether two segments' columns collide. They are assumed to be in the same row.

function isDaySegCollision(seg, otherSegs) {

	var i, otherSeg;



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

		otherSeg = otherSegs[i];



		if (

			otherSeg.leftCol <= seg.rightCol &&

			otherSeg.rightCol >= seg.leftCol

		) {

			return true;

		}

	}



	return false;

}





// A cmp function for determining the leftmost event

function compareDaySegCols(a, b) {

	return a.leftCol - b.leftCol;

}



    /* Methods relate to limiting the number events for a given day on a DayGrid

----------------------------------------------------------------------------------------------------------------------*/

// NOTE: all the segs being passed around in here are foreground segs



DayGrid.mixin({



	segPopover: null, // the Popover that holds events that can't fit in a cell. null when not visible

	popoverSegs: null, // an array of segment objects that the segPopover holds. null when not visible





	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 rowStruct = this.rowStructs[row];

		var moreNodes = []; // array of "more" <a> links and <td> DOM nodes

		var col = 0; // col #, left-to-right (not chronologically)

		var cell;

		var levelSegs; // array of segment objects in the last allowable level, ordered left-to-right

		var cellMatrix; // a matrix (by level, then column) of all <td> jQuery elements in the row

		var limitedNodes; // array of temporarily hidden level <tr> and segment <td> DOM nodes

		var i, seg;

		var segsBelow; // array of segment objects below `seg` in the current `col`

		var totalSegsBelow; // total number of segments below `seg` in any of the columns `seg` occupies

		var colSegsBelow; // array of segment arrays, below seg, one for each column (offset from segs's first column)

		var td, rowspan;

		var segMoreNodes; // array of "more" <td> cells that will stand-in for the current seg's cell

		var j;

		var moreTd, moreWrap, moreLink;



		// Iterates through empty level cells and places "more" links inside if need be

		function emptyCellsUntil(endCol) { // goes from current `col` to `endCol`

			while (col < endCol) {

				cell = _this.getCell(row, col);

				segsBelow = _this.getCellSegs(cell, levelLimit);

				if (segsBelow.length) {

					td = cellMatrix[levelLimit - 1][col];

					moreLink = _this.renderMoreLink(cell, segsBelow);

					moreWrap = $('<div/>').append(moreLink);

					td.append(moreWrap);

					moreNodes.push(moreWrap[0]);

				}

				col++;

			}

		}



		if (levelLimit && levelLimit < rowStruct.segLevels.length) { // is it actually over the limit?

			levelSegs = rowStruct.segLevels[levelLimit - 1];

			cellMatrix = rowStruct.cellMatrix;



			limitedNodes = rowStruct.tbodyEl.children().slice(levelLimit) // get level <tr> elements past the limit

				.addClass('fc-limited').get(); // hide elements and get a simple DOM-nodes array



			// iterate though segments in the last allowable level

			for (i = 0; i < levelSegs.length; i++) {

				seg = levelSegs[i];

				emptyCellsUntil(seg.leftCol); // process empty cells before the segment



				// determine *all* segments below `seg` that occupy the same columns

				colSegsBelow = [];

				totalSegsBelow = 0;

				while (col <= seg.rightCol) {

					cell = this.getCell(row, col);

					segsBelow = this.getCellSegs(cell, levelLimit);

					colSegsBelow.push(segsBelow);

					totalSegsBelow += segsBelow.length;

					col++;

				}



				if (totalSegsBelow) { // do we need to replace this segment with one or many "more" links?

					td = cellMatrix[levelLimit - 1][seg.leftCol]; // the segment's parent cell

					rowspan = td.attr('rowspan') || 1;

					segMoreNodes = [];



					// make a replacement <td> for each column the segment occupies. will be one for each colspan

					for (j = 0; j < colSegsBelow.length; j++) {

						moreTd = $('<td class="fc-more-cell"/>').attr('rowspan', rowspan);

						segsBelow = colSegsBelow[j];

						cell = this.getCell(row, seg.leftCol + j);

						moreLink = this.renderMoreLink(cell, [ seg ].concat(segsBelow)); // count seg as hidden too

						moreWrap = $('<div/>').append(moreLink);

						moreTd.append(moreWrap);

						segMoreNodes.push(moreTd[0]);

						moreNodes.push(moreTd[0]);

					}



					td.addClass('fc-limited').after($(segMoreNodes)); // hide original <td> and inject replacements

					limitedNodes.push(td[0]);

				}

			}



			emptyCellsUntil(this.colCnt); // finish off the level

			rowStruct.moreEls = $(moreNodes); // for easy undoing later

			rowStruct.limitedEls = $(limitedNodes); // for easy undoing later

		}

	},





	// Reveals all levels and removes all "more"-related elements for a grid's row.

	// `row` is a row number.

	unlimitRow: function(row) {

		var rowStruct = this.rowStructs[row];



		if (rowStruct.moreEls) {

			rowStruct.moreEls.remove();

			rowStruct.moreEls = null;

		}



		if (rowStruct.limitedEls) {

			rowStruct.limitedEls.removeClass('fc-limited');

			rowStruct.limitedEls = null;

		}

	},





	// Renders an <a> element that represents hidden event element for a cell.

	// Responsible for attaching click handler as well.

	renderMoreLink: function(cell, hiddenSegs) {

		var _this = this;

		var view = this.view;



		return $('<a class="fc-more"/>')

			.text(

				this.getMoreLinkText(hiddenSegs.length)

			)

			.on('click', function(ev) {

				var clickOption = view.opt('eventLimitClick');

				var date = cell.start;

				var moreEl = $(this);

				var dayEl = _this.getCellDayEl(cell);

				var allSegs = _this.getCellSegs(cell);



				// rescope the segments to be within the cell's date

				var reslicedAllSegs = _this.resliceDaySegs(allSegs, date);

				var reslicedHiddenSegs = _this.resliceDaySegs(hiddenSegs, date);



				if (typeof clickOption === 'function') {

					// the returned value can be an atomic option

					clickOption = view.trigger('eventLimitClick', null, {

						date: date,

						dayEl: dayEl,

						moreEl: moreEl,

						segs: reslicedAllSegs,

						hiddenSegs: reslicedHiddenSegs

					}, ev);

				}



				if (clickOption === 'popover') {

					_this.showSegPopover(cell, moreEl, reslicedAllSegs);

				}

				else if (typeof clickOption === 'string') { // a view name

					view.calendar.zoomTo(date, clickOption);

				}

			});

	},





	// Reveals the popover that displays all events within a cell

	showSegPopover: function(cell, moreLink, segs) {

		var _this = this;

		var view = this.view;

		var moreWrap = moreLink.parent(); // the <div> wrapper around the <a>

		var topEl; // the element we want to match the top coordinate of

		var options;



		if (this.rowCnt == 1) {

			topEl = view.el; // will cause the popover to cover any sort of header

		}

		else {

			topEl = this.rowEls.eq(cell.row); // will align with top of row

		}



		options = {

			className: 'fc-more-popover',

			content: this.renderSegPopoverContent(cell, segs),

			parentEl: this.el,

			top: topEl.offset().top,

			autoHide: true, // when the user clicks elsewhere, hide the popover

			viewportConstrain: view.opt('popoverViewportConstrain'),

			hide: function() {

				// 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 (this.isRTL) {

			options.right = moreWrap.offset().left + moreWrap.outerWidth() + 1; // +1 to be over cell border

		}

		else {

			options.left = moreWrap.offset().left - 1; // -1 to be over cell border

		}



		this.segPopover = new Popover(options);

		this.segPopover.show();

	},





	// Builds the inner DOM contents of the segment popover

	renderSegPopoverContent: function(cell, segs) {

		var view = this.view;

		var isTheme = view.opt('theme');

		var title = cell.start.format(view.opt('dayPopoverFormat'));

		var content = $(

			'<div class="fc-header ' + view.widgetHeaderClass + '">' +

				'<span class="fc-close ' +

					(isTheme ? 'ui-icon ui-icon-closethick' : 'fc-icon fc-icon-x') +

				'"></span>' +

				'<span class="fc-title">' +

					htmlEscape(title) +

				'</span>' +

				'<div class="fc-clear"/>' +

			'</div>' +

			'<div class="fc-body ' + view.widgetContentClass + '">' +

				'<div class="fc-event-container"></div>' +

			'</div>'

		);

		var segContainer = content.find('.fc-event-container');

		var i;



		// render each seg's `el` and only return the visible segs

		segs = this.renderFgSegEls(segs, true); // disableResizing=true

		this.popoverSegs = segs;



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



			// because segments in the popover are not part of a grid coordinate system, provide a hint to any

			// grids that want to do drag-n-drop about which cell it came from

			segs[i].cell = cell;



			segContainer.append(segs[i].el);

		}



		return content;

	},





	// Given the events within an array of segment objects, reslice them to be in a single day

	resliceDaySegs: function(segs, dayDate) {



		// build an array of the original events

		var events = $.map(segs, function(seg) {

			return seg.event;

		});



		var dayStart = dayDate.clone().stripTime();

		var dayEnd = dayStart.clone().add(1, 'days');

		var dayRange = { start: dayStart, end: dayEnd };



		// slice the events with a custom slicing function

		return this.eventsToSegs(

			events,

			function(range) {

				var seg = intersectionToSeg(range, dayRange); // undefind if no intersection

				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 opt = this.view.opt('eventLimitText');



		if (typeof opt === 'function') {

			return opt(num);

		}

		else {

			return '+' + num + ' ' + opt;

		}

	},





	// Returns segments within a given cell.

	// If `startLevel` is specified, returns only events including and below that level. Otherwise returns all segs.

	getCellSegs: function(cell, startLevel) {

		var segMatrix = this.rowStructs[cell.row].segMatrix;

		var level = startLevel || 0;

		var segs = [];

		var seg;



		while (level < segMatrix.length) {

			seg = segMatrix[level][cell.col];

			if (seg) {

				segs.push(seg);

			}

			level++;

		}



		return segs;

	}



});



    /* A component that renders one or more columns of vertical time slots

----------------------------------------------------------------------------------------------------------------------*/



var TimeGrid = Grid.extend({



	slotDuration: null, // duration of a "slot", a distinct time segment on given day, visualized by lines

	snapDuration: null, // granularity of time for dragging and selecting



	minTime: null, // Duration object that denotes the first visible time of any given day

	maxTime: null, // Duration object that denotes the exclusive visible end time of any given day



	axisFormat: null, // formatting string for times running along vertical axis



	dayEls: null, // cells elements in the day-row background

	slatEls: null, // elements running horizontally across all columns



	slatTops: null, // an array of top positions, relative to the container. last item holds bottom of last slot



	helperEl: null, // cell skeleton element for rendering the mock event "helper"



	businessHourSegs: null,





	constructor: function() {

		Grid.apply(this, arguments); // call the super-constructor

		this.processOptions();

	},





	// Renders the time grid into `this.el`, which should already be assigned.

	// Relies on the view's colCnt. In the future, this component should probably be self-sufficient.

	render: function() {

		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(cell) {

		return this.bgCellHtml(cell);

	},





	// Generates the HTML for the horizontal "slats" that run width-wise. Has a time axis on a side. Depends on RTL.

	slatRowHtml: function() {

		var view = this.view;

		var isRTL = this.isRTL;

		var html = '';

		var 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 = this.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(slotDate.format(this.axisFormat)) +

						'</span>' :

						''

						) +

				'</td>';



			html +=

				'<tr ' + (!minutes ? '' : 'class="fc-minor"') + '>' +

					(!isRTL ? axisHtml : '') +

					'<td class="' + view.widgetContentClass + '"/>' +

					(isRTL ? axisHtml : '') +

				"</tr>";



			slotTime.add(this.slotDuration);

		}



		return html;

	},





	/* Options

	------------------------------------------------------------------------------------------------------------------*/





	// Parses various options into properties of this object

	processOptions: function() {

		var view = this.view;

		var slotDuration = view.opt('slotDuration');

		var snapDuration = view.opt('snapDuration');



		slotDuration = moment.duration(slotDuration);

		snapDuration = snapDuration ? moment.duration(snapDuration) : slotDuration;



		this.slotDuration = slotDuration;

		this.snapDuration = snapDuration;



		this.minTime = moment.duration(view.opt('minTime'));

		this.maxTime = moment.duration(view.opt('maxTime'));



		this.axisFormat = view.opt('axisFormat') || view.opt('smallTimeFormat');

	},





	// Computes a default column header formatting string if `colFormat` is not explicitly defined

	computeColHeadFormat: function() {

		if (this.colCnt > 1) { // multiple days, so full single date string WON'T be in title text

			return this.view.opt('dayOfMonthFormat'); // "Sat 12/10"

		}

		else { // single day, so full single date string will probably be in title text

			return 'dddd'; // "Saturday"

		}

	},





	// Computes a default event time formatting string if `timeFormat` is not explicitly defined

	computeEventTimeFormat: function() {

		return this.view.opt('noMeridiemTimeFormat'); // like "6:30" (no AM/PM)

	},





	// Computes a default `displayEventEnd` value if one is not expliclty defined

	computeDisplayEventEnd: function() {

		return true;

	},





	/* Cell System

	------------------------------------------------------------------------------------------------------------------*/





	// Initializes row/col information

	updateCells: function() {

		var view = this.view;

		var colData = [];

		var date;



		date = this.start.clone();

		while (date.isBefore(this.end)) {

			colData.push({

				day: date.clone()

			});

			date.add(1, 'day');

			date = view.skipHiddenDays(date);

		}



		if (this.isRTL) {

			colData.reverse();

		}



		this.colData = colData;

		this.colCnt = colData.length;

		this.rowCnt = Math.ceil((this.maxTime - this.minTime) / this.snapDuration); // # of vertical snaps

	},





	// Given a cell object, generates a range object

	computeCellRange: function(cell) {

		var time = this.computeSnapTime(cell.row);

		var start = this.view.calendar.rezoneDate(cell.day).time(time);

		var end = start.clone().add(this.snapDuration);



		return { start: start, end: end };

	},





	// Retrieves the element representing the given column

	getColEl: function(col) {

		return this.dayEls.eq(col);

	},





	/* Dates

	------------------------------------------------------------------------------------------------------------------*/





	// Given a row number of the grid, representing a "snap", returns a time (Duration) from its start-of-day

	computeSnapTime: function(row) {

		return moment.duration(this.minTime + this.snapDuration * row);

	},





	// Slices up a date range by column into an array of segments

	rangeToSegs: function(range) {

		var colCnt = this.colCnt;

		var segs = [];

		var seg;

		var col;

		var colDate;

		var colRange;



		// normalize :(

		range = {

			start: range.start.clone().stripZone(),

			end: range.end.clone().stripZone()

		};



		for (col = 0; col < colCnt; col++) {

			colDate = this.colData[col].day; // will be ambig time/timezone

			colRange = {

				start: colDate.clone().time(this.minTime),

				end: colDate.clone().time(this.maxTime)

			};

			seg = intersectionToSeg(range, colRange); // both will be ambig timezone

			if (seg) {

				seg.col = col;

				segs.push(seg);

			}

		}



		return segs;

	},





	/* Coordinates

	------------------------------------------------------------------------------------------------------------------*/





	// Called when there is a window resize/zoom and we need to recalculate coordinates for the grid

	resize: function() {

		this.computeSlatTops();

		this.updateSegVerticals();

	},





	// Computes the top/bottom coordinates of each "snap" rows

	computeRowCoords: function() {

		var originTop = this.el.offset().top;

		var items = [];

		var i;

		var item;



		for (i = 0; i < this.rowCnt; i++) {

			item = {

				top: originTop + this.computeTimeTop(this.computeSnapTime(i))

			};

			if (i > 0) {

				items[i - 1].bottom = item.top;

			}

			items.push(item);

		}

		item.bottom = item.top + this.computeTimeTop(this.computeSnapTime(i));



		return items;

	},





	// Computes the top coordinate, relative to the bounds of the grid, of the given date.

	// A `startOfDayDate` must be given for avoiding ambiguity over how to treat midnight.

	computeDateTop: function(date, startOfDayDate) {

		return this.computeTimeTop(

			moment.duration(

				date.clone().stripZone() - startOfDayDate.clone().stripTime()

			)

		);

	},





	// Computes the top coordinate, relative to the bounds of the grid, of the given time (a Duration).

	computeTimeTop: function(time) {

		var slatCoverage = (time - this.minTime) / this.slotDuration; // floating-point value of # of slots covered

		var slatIndex;

		var slatRemainder;

		var slatTop;

		var slatBottom;



		// constrain. because minTime/maxTime might be customized

		slatCoverage = Math.max(0, slatCoverage);

		slatCoverage = Math.min(this.slatEls.length, slatCoverage);



		slatIndex = Math.floor(slatCoverage); // an integer index of the furthest whole slot

		slatRemainder = slatCoverage - slatIndex;

		slatTop = this.slatTops[slatIndex]; // the top position of the furthest whole slot



		if (slatRemainder) { // time spans part-way into the slot

			slatBottom = this.slatTops[slatIndex + 1];

			return slatTop + (slatBottom - slatTop) * slatRemainder; // part-way between slots

		}

		else {

			return slatTop;

		}

	},





	// Queries each `slatEl` for its position relative to the grid's container and stores it in `slatTops`.

	// Includes the the bottom of the last slat as the last item in the array.

	computeSlatTops: function() {

		var tops = [];

		var top;



		this.slatEls.each(function(i, node) {

			top = $(node).position().top;

			tops.push(top);

		});



		tops.push(top + this.slatEls.last().outerHeight()); // bottom of the last slat



		this.slatTops = tops;

	},





	/* Event Drag Visualization

	------------------------------------------------------------------------------------------------------------------*/





	// Renders a visual indication of an event being dragged over the specified date(s).

	// dropLocation's end might be null, as well as `seg`. See Grid::renderDrag for more info.

	// A returned value of `true` signals that a mock "helper" event has been rendered.

	renderDrag: function(dropLocation, seg) {

		var opacity;



		if (seg) { // if there is event information for this drag, render a helper event

			this.renderRangeHelper(dropLocation, 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(

				this.view.calendar.ensureVisibleEventRange(dropLocation) // needs to be a proper range

			);

		}

	},





	// 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

	renderEventResize: function(range, seg) {

		this.renderRangeHelper(range, seg);

	},





	// Unrenders any visual indication of an event being resized

	destroyEventResize: 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(range) {

		if (this.view.opt('selectHelper')) { // this setting signals that a mock helper event should be rendered

			this.renderRangeHelper(range);

		}

		else {

			this.renderHighlight(range);

		}

	},





	// 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 segCols;

		var skeletonEl;

		var trEl;

		var col, colSegs;

		var tdEl;

		var containerEl;

		var dayDate;

		var i, seg;



		if (segs.length) {



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

			segCols = this.groupSegCols(segs); // group into sub-arrays, and assigns 'col' to each seg



			className = className || type.toLowerCase();

			skeletonEl = $(

				'<div class="fc-' + className + '-skeleton">' +

					'<table><tr/></table>' +

				'</div>'

			);

			trEl = skeletonEl.find('tr');



			for (col = 0; col < segCols.length; col++) {

				colSegs = segCols[col];

				tdEl = $('<td/>').appendTo(trEl);



				if (colSegs.length) {

					containerEl = $('<div class="fc-' + className + '-container"/>').appendTo(tdEl);

					dayDate = this.colData[col].day;



					for (i = 0; i < colSegs.length; i++) {

						seg = colSegs[i];

						containerEl.append(

							seg.el.css({

								top: this.computeDateTop(seg.start, dayDate),

								bottom: -this.computeDateTop(seg.end, dayDate) // the y position of the bottom edge

							})

						);

					}

				}

			}



			this.bookendCells(trEl, type);



			this.el.append(skeletonEl);

			this.elsByFill[type] = skeletonEl;

		}



		return segs;

	}



});



    /* Event-rendering methods for the TimeGrid class

----------------------------------------------------------------------------------------------------------------------*/



TimeGrid.mixin({



	eventSkeletonEl: null, // has cells with event-containers, which contain absolutely positioned event elements





	// Renders the given foreground event segments onto the grid

	renderFgSegs: function(segs) {

		segs = this.renderFgSegEls(segs); // returns a subset of the segs. segs that were actually rendered



		this.el.append(

			this.eventSkeletonEl = $('<div class="fc-content-skeleton"/>')

				.append(this.renderSegTable(segs))

		);



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

	},





	// Unrenders all currently rendered foreground event segments

	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 = this.getEventTimeText(seg);

				fullTimeText = this.getEventTimeText(seg, 'LT');

				startTimeText = this.getEventTimeText({ start: seg.start });

			}

		} else {

			// Display the normal time text for the *event's* times

			timeText = this.getEventTimeText(event);

			fullTimeText = this.getEventTimeText(event, 'LT');

			startTimeText = this.getEventTimeText({ start: event.start });

		}



		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 shouldOverlap = this.view.opt('slotEventOverlap');

		var backwardCoord = seg.backwardCoord; // the left side if LTR. the right side if RTL. floating-point

		var forwardCoord = seg.forwardCoord; // the right side if LTR. the left side if RTL. floating-point

		var props = this.generateSegVerticalCss(seg); // get top/bottom first

		var left; // amount of space from left edge, a fraction of the total width

		var right; // amount of space from right edge, a fraction of the total width



		if (shouldOverlap) {

			// double the width, but don't go beyond the maximum forward coordinate (1.0)

			forwardCoord = Math.min(1, backwardCoord + (forwardCoord - backwardCoord) * 2);

		}



		if (this.isRTL) {

			left = 1 - forwardCoord;

			right = backwardCoord;

		}

		else {

			left = backwardCoord;

			right = 1 - forwardCoord;

		}



		props.zIndex = seg.level + 1; // convert from 0-base to 1-based

		props.left = left * 100 + '%';

		props.right = right * 100 + '%';



		if (shouldOverlap && seg.forwardPressure) {

			// add padding to the edge so that forward stacked events don't cover the resizer's icon

			props[this.isRTL ? 'marginLeft' : 'marginRight'] = 10 * 2; // 10 is a guesstimate of the icon's width

		}



		return props;

	},





	// Generates an object with CSS properties for the top/bottom coordinates of a segment element

	generateSegVerticalCss: function(seg) {

		return {

			top: seg.top,

			bottom: -seg.bottom // flipped because needs to be space beyond bottom edge of event container

		};

	},





	// Given a flat array of segments, return an array of sub-arrays, grouped by each segment's col

	groupSegCols: function(segs) {

		var segCols = [];

		var i;



		for (i = 0; i < this.colCnt; i++) {

			segCols.push([]);

		}



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

			segCols[segs[i].col].push(segs[i]);

		}



		return segCols;

	}



});





// 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

----------------------------------------------------------------------------------------------------------------------*/



var View = fc.View = Class.extend({



	type: null, // subclass' view name (string)

	name: null, // deprecated. use `type` instead



	calendar: null, // owner Calendar object

	options: null, // view-specific options

	coordMap: null, // a CoordMap object for converting pixel regions to dates

	el: null, // the view's containing element. set by Calendar



	// range the view is actually displaying (moments)

	start: null,

	end: null, // exclusive



	// range the view is formally responsible for (moments)

	// may be different from start/end. for example, a month view might have 1st-31st, excluding padded dates

	intervalStart: null,

	intervalEnd: null, // exclusive



	intervalDuration: null, // the whole-unit duration that is being displayed

	intervalUnit: null, // name of largest unit being displayed, like "month" or "week"



	isSelected: false, // boolean whether a range of time is 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,



	// for date utils, computed from options

	nextDayThreshold: null,

	isHiddenDayHash: null,



	// document handlers, bound to `this` object

	documentMousedownProxy: null, // TODO: doesn't work with touch





	constructor: function(calendar, viewOptions, viewType) {

		this.calendar = calendar;

		this.options = viewOptions;

		this.type = this.name = viewType; // .name is deprecated



		this.nextDayThreshold = moment.duration(this.opt('nextDayThreshold'));

		this.initTheming();

		this.initHiddenDays();



		this.documentMousedownProxy = $.proxy(this, 'documentMousedown');



		this.initialize();

	},





	// A good place for subclasses to initialize member variables

	initialize: function() {

		// subclasses can implement

	},





	// Retrieves an option with the given name

	opt: function(name) {

		var val;



		val = this.options[name]; // look at view-specific options first

		if (val !== undefined) {

			return val;

		}



		val = this.calendar.options[name];

		if ($.isPlainObject(val) && !isForcedAtomicOption(name)) { // view-option-hashes are deprecated

			return smartProperty(val, this.type);

		}



		return val;

	},





	// Triggers handlers that are view-related. Modifies args before passing to calendar.

	trigger: function(name, thisObj) { // arguments beyond thisObj are passed along

		var calendar = this.calendar;



		return calendar.trigger.apply(

			calendar,

			[name, thisObj || this].concat(

				Array.prototype.slice.call(arguments, 2), // arguments beyond thisObj

				[ this ] // always make the last argument a reference to the view. TODO: deprecate

			)

		);

	},





	/* Dates

	------------------------------------------------------------------------------------------------------------------*/





	// Updates all internal dates to center around the given current date

	setDate: function(date) {

		this.setRange(this.computeRange(date));

	},





	// Updates all internal dates for displaying the given range.

	// Expects all values to be normalized (like what computeRange does).

	setRange: function(range) {

		$.extend(this, range);

	},





	// Given a single current date, produce information about what range to display.

	// Subclasses can override. Must return all properties.

	computeRange: function(date) {

		var intervalDuration = moment.duration(this.opt('duration') || this.constructor.duration || { days: 1 });

		var intervalUnit = computeIntervalUnit(intervalDuration);

		var intervalStart = date.clone().startOf(intervalUnit);

		var intervalEnd = intervalStart.clone().add(intervalDuration);

		var start, end;



		// normalize the range's time-ambiguity

		if (computeIntervalAs('days', intervalDuration)) { // whole-days?

			intervalStart.stripTime();

			intervalEnd.stripTime();

		}

		else { // needs to have a time?

			if (!intervalStart.hasTime()) {

				intervalStart = this.calendar.rezoneDate(intervalStart); // convert to current timezone, with 00:00

			}

			if (!intervalEnd.hasTime()) {

				intervalEnd = this.calendar.rezoneDate(intervalEnd); // convert to current timezone, with 00:00

			}

		}



		start = intervalStart.clone();

		start = this.skipHiddenDays(start);

		end = intervalEnd.clone();

		end = this.skipHiddenDays(end, -1, true); // exclusively move backwards



		return {

			intervalDuration: intervalDuration,

			intervalUnit: intervalUnit,

			intervalStart: intervalStart,

			intervalEnd: intervalEnd,

			start: start,

			end: end

		};

	},





	// Computes the new date when the user hits the prev button, given the current date

	computePrevDate: function(date) {

		return this.skipHiddenDays(

			date.clone().startOf(this.intervalUnit).subtract(this.intervalDuration), -1

		);

	},





	// Computes the new date when the user hits the next button, given the current date

	computeNextDate: function(date) {

		return this.skipHiddenDays(

			date.clone().startOf(this.intervalUnit).add(this.intervalDuration)

		);

	},





	/* Title and Date Formatting

	------------------------------------------------------------------------------------------------------------------*/





	// Computes what the title at the top of the calendar should be for this view

	computeTitle: function() {

		return this.formatRange(

			{ start: this.intervalStart, end: this.intervalEnd },

			this.opt('titleFormat') || this.computeTitleFormat(),

			this.opt('titleRangeSeparator')

		);

	},





	// Generates the format string that should be used to generate the title for the current date range.

	// Attempts to compute the most appropriate format if not explicitly specified with `titleFormat`.

	computeTitleFormat: function() {

		if (this.intervalUnit == 'year') {

			return 'YYYY';

		}

		else if (this.intervalUnit == 'month') {

			return this.opt('monthYearFormat'); // like "September 2014"

		}

		else if (this.intervalDuration.as('days') > 1) {

			return 'll'; // multi-day range. shorter, like "Sep 9 - 10 2014"

		}

		else {

			return 'LL'; // one day. longer, like "September 9 2014"

		}

	},





	// Utility for formatting a range. Accepts a range object, formatting string, and optional separator.

	// Displays all-day ranges naturally, with an inclusive end. Takes the current isRTL into account.

	formatRange: function(range, formatStr, separator) {

		var end = range.end;



		if (!end.hasTime()) { // all-day?

			end = end.clone().subtract(1); // convert to inclusive. last ms of previous day

		}



		return formatRange(range.start, end, formatStr, separator, this.opt('isRTL'));

	},





	/* Rendering

	------------------------------------------------------------------------------------------------------------------*/





	// Wraps the basic render() method with more View-specific logic. Called by the owner Calendar.

	renderView: function() {

		this.render();

		this.updateSize();

		this.initializeScroll();

		this.trigger('viewRender', this, this, this.el);



		// attach handlers to document. do it here to allow for destroy/rerender

		$(document).on('mousedown', this.documentMousedownProxy);

	},





	// Renders the view inside an already-defined `this.el`

	render: function() {

		// subclasses should implement

	},





	// Wraps the basic destroy() method with more View-specific logic. Called by the owner Calendar.

	destroyView: function() {

		this.unselect();

		this.destroyViewEvents();

		this.destroy();

		this.trigger('viewDestroy', this, this, this.el);



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

	},





	// Clears the view's rendering

	destroy: function() {

		this.el.empty(); // removes inner contents but leaves the element intact

	},





	// Initializes internal variables related to theming

	initTheming: function() {

		var tm = this.opt('theme') ? 'ui' : 'fc';



		this.widgetHeaderClass = tm + '-widget-header';

		this.widgetContentClass = tm + '-widget-content';

		this.highlightStateClass = tm + '-state-highlight';

	},





	/* Dimensions

	------------------------------------------------------------------------------------------------------------------*/





	// Refreshes anything dependant upon sizing of the container element of the grid

	updateSize: function(isResize) {

		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

	},





	/* Scroller

	------------------------------------------------------------------------------------------------------------------*/





	// Given the total height of the view, return the number of pixels that should be used for the scroller.

	// By default, uses this.scrollerEl, but can pass this in as well.

	// Utility for subclasses.

	computeScrollerHeight: function(totalHeight, scrollerEl) {

		var both;

		var otherHeight; // cumulative height of everything that is not the scrollerEl in the view (header+borders)



		scrollerEl = scrollerEl || this.scrollerEl;

		both = this.el.add(scrollerEl);



		// fuckin IE8/9/10/11 sometimes returns 0 for dimensions. this weird hack was the only thing that worked

		both.css({

			position: 'relative', // cause a reflow, which will force fresh dimension recalculation

			left: -1 // ensure reflow in case the el was already relative. negative is less likely to cause new scroll

		});

		otherHeight = this.el.outerHeight() - scrollerEl.height(); // grab the dimensions

		both.css({ position: '', left: '' }); // undo hack



		return totalHeight - otherHeight;

	},





	// Sets the scroll value of the scroller to the initial pre-configured state prior to allowing the user to change it

	initializeScroll: function() {

	},





	// 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);

		}

	},





	/* Event Elements / Segments

	------------------------------------------------------------------------------------------------------------------*/





	// Wraps the basic renderEvents() method with more View-specific logic

	renderViewEvents: function(events) {

		this.renderEvents(events);



		this.eventSegEach(function(seg) {

			this.trigger('eventAfterRender', seg.event, seg.event, seg.el);

		});

		this.trigger('eventAfterAllRender');

	},





	// Renders the events onto the view.

	renderEvents: function() {

		// subclasses should implement

	},





	// Wraps the basic destroyEvents() method with more View-specific logic

	destroyViewEvents: function() {

		this.eventSegEach(function(seg) {

			this.trigger('eventDestroy', seg.event, seg.event, seg.el);

		});



		this.destroyEvents();

	},





	// Removes event elements from the view.

	destroyEvents: function() {

		// subclasses should implement

	},





	// 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.eventSegEach(function(seg) {

			seg.el.css('visibility', '');

		}, event);

	},





	// Shows all rendered event segments linked to the given event

	hideEvent: function(event) {

		this.eventSegEach(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.

	eventSegEach: function(func, event) {

		var segs = this.getEventSegs();

		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

	getEventSegs: function() {

		// subclasses must implement

		return [];

	},





	/* Event Drag-n-Drop

	------------------------------------------------------------------------------------------------------------------*/





	// Computes if the given event is allowed to be dragged by the user

	isEventDraggable: function(event) {

		var source = event.source || {};



		return firstDefined(

			event.startEditable,

			source.startEditable,

			this.opt('eventStartEditable'),

			event.editable,

			source.editable,

			this.opt('editable')

		);

	},





	// Must be called when an event in the view is dropped onto new location.

	// `dropLocation` is an object that contains the new start/end/allDay values for the event.

	reportEventDrop: function(event, dropLocation, el, ev) {

		var calendar = this.calendar;

		var mutateResult = calendar.mutateEvent(event, dropLocation);

		var undoFunc = function() {

			mutateResult.undo();

			calendar.reportEventChange();

		};



		this.triggerEventDrop(event, mutateResult.dateDelta, undoFunc, el, ev);

		calendar.reportEventChange(); // will rerender events

	},





	// Triggers event-drop handlers that have subscribed via the API

	triggerEventDrop: function(event, dateDelta, undoFunc, el, ev) {

		this.trigger('eventDrop', el[0], event, dateDelta, undoFunc, ev, {}); // {} = jqui dummy

	},





	/* External Element Drag-n-Drop

	------------------------------------------------------------------------------------------------------------------*/





	// Must be called when an external element, via jQuery UI, has been dropped onto the calendar.

	// `meta` is the parsed data that has been embedded into the dragging event.

	// `dropLocation` is an object that contains the new start/end/allDay values for the event.

	reportExternalDrop: function(meta, dropLocation, el, ev, ui) {

		var eventProps = meta.eventProps;

		var eventInput;

		var event;



		// Try to build an event object and render it. TODO: decouple the two

		if (eventProps) {

			eventInput = $.extend({}, eventProps, dropLocation);

			event = this.calendar.renderEvent(eventInput, meta.stick)[0]; // renderEvent returns an array

		}



		this.triggerExternalDrop(event, dropLocation, el, ev, ui);

	},





	// Triggers external-drop handlers that have subscribed via the API

	triggerExternalDrop: function(event, dropLocation, el, ev, ui) {



		// trigger 'drop' regardless of whether element represents an event

		this.trigger('drop', el[0], dropLocation.start, ev, ui);



		if (event) {

			this.trigger('eventReceive', null, event); // signal an external event landed

		}

	},





	/* Drag-n-Drop Rendering (for both events and external elements)

	------------------------------------------------------------------------------------------------------------------*/





	// Renders a visual indication of a event or external-element drag over the given drop zone.

	// If an external-element, seg will be `null`

	renderDrag: function(dropLocation, seg) {

		// subclasses must implement

	},





	// Unrenders a visual indication of an event or external-element being dragged.

	destroyDrag: function() {

		// subclasses must implement

	},





	/* Event Resizing

	------------------------------------------------------------------------------------------------------------------*/





	// Computes if the given event is allowed to be resize by the user

	isEventResizable: function(event) {

		var source = event.source || {};



		return firstDefined(

			event.durationEditable,

			source.durationEditable,

			this.opt('eventDurationEditable'),

			event.editable,

			source.editable,

			this.opt('editable')

		);

	},





	// Must be called when an event in the view has been resized to a new length

	reportEventResize: function(event, newEnd, el, ev) {

		var calendar = this.calendar;

		var mutateResult = calendar.mutateEvent(event, { end: newEnd });

		var undoFunc = function() {

			mutateResult.undo();

			calendar.reportEventChange();

		};



		this.triggerEventResize(event, mutateResult.durationDelta, undoFunc, el, ev);

		calendar.reportEventChange(); // will rerender events

	},





	// Triggers event-resize handlers that have subscribed via the API

	triggerEventResize: function(event, durationDelta, undoFunc, el, ev) {

		this.trigger('eventResize', el[0], event, durationDelta, undoFunc, ev, {}); // {} = jqui dummy

	},





	/* Selection

	------------------------------------------------------------------------------------------------------------------*/





	// Selects a date range on the view. `start` and `end` are both Moments.

	// `ev` is the native mouse event that begin the interaction.

	select: function(range, ev) {

		this.unselect(ev);

		this.renderSelection(range);

		this.reportSelection(range, ev);

	},





	// Renders a visual indication of the selection

	renderSelection: function(range) {

		// subclasses should implement

	},





	// Called when a new selection is made. Updates internal state and triggers handlers.

	reportSelection: function(range, ev) {

		this.isSelected = true;

		this.trigger('select', null, range.start, range.end, ev);

	},





	// Undoes a selection. updates in the internal state and triggers handlers.

	// `ev` is the native mouse event that began the interaction.

	unselect: function(ev) {

		if (this.isSelected) {

			this.isSelected = false;

			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);

			}

		}

	},





	/* Date Utils

	------------------------------------------------------------------------------------------------------------------*/





	// Initializes internal variables related to calculating hidden days-of-week

	initHiddenDays: function() {

		var hiddenDays = this.opt('hiddenDays') || []; // array of day-of-week indices that are hidden

		var isHiddenDayHash = []; // is the day-of-week hidden? (hash with day-of-week-index -> bool)

		var dayCnt = 0;

		var i;



		if (this.opt('weekends') === false) {

			hiddenDays.push(0, 6); // 0=sunday, 6=saturday

		}



		for (i = 0; i < 7; i++) {

			if (

				!(isHiddenDayHash[i] = $.inArray(i, hiddenDays) !== -1)

			) {

				dayCnt++;

			}

		}



		if (!dayCnt) {

			throw 'invalid hiddenDays'; // all days were hidden? bad.

		}



		this.isHiddenDayHash = isHiddenDayHash;

	},





	// Is the current day hidden?

	// `day` is a day-of-week index (0-6), or a Moment

	isHiddenDay: function(day) {

		if (moment.isMoment(day)) {

			day = day.day();

		}

		return this.isHiddenDayHash[day];

	},





	// Incrementing the current day until it is no longer a hidden day, returning a copy.

	// If the initial value of `date` is not a hidden day, don't do anything.

	// Pass `isExclusive` as `true` if you are dealing with an end date.

	// `inc` defaults to `1` (increment one day forward each time)

	skipHiddenDays: function(date, inc, isExclusive) {

		var out = date.clone();

		inc = inc || 1;

		while (

			this.isHiddenDayHash[(out.day() + (isExclusive ? inc : 0) + 7) % 7]

		) {

			out.add(inc, 'days');

		}

		return out;

	},





	// Returns the date range of the full days the given range visually appears to occupy.

	// Returns a new range object.

	computeDayRange: function(range) {

		var startDay = range.start.clone().stripTime(); // the beginning of the day the range starts

		var end = range.end;

		var endDay = null;

		var endTimeMS;



		if (end) {

			endDay = end.clone().stripTime(); // the beginning of the day the range exclusively ends

			endTimeMS = +end.time(); // # of milliseconds into `endDay`



			// If the end time is actually inclusively part of the next day and is equal to or

			// beyond the next day threshold, adjust the end to be the exclusive end of `endDay`.

			// Otherwise, leaving it as inclusive will cause it to exclude `endDay`.

			if (endTimeMS && endTimeMS >= this.nextDayThreshold) {

				endDay.add(1, 'days');

			}

		}



		// If no end was specified, or if it is within `startDay` but not past nextDayThreshold,

		// assign the default duration of one day.

		if (!end || endDay <= startDay) {

			endDay = startDay.clone().add(1, 'days');

		}



		return { start: startDay, end: endDay };

	},





	// Does the given event visually appear to occupy more than one day?

	isMultiDayEvent: function(event) {

		var range = this.computeDayRange(event); // event is range-ish



		return range.end.diff(range.start, 'days') > 1;

	}



});



    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;

	t.isValidViewType = isValidViewType;

	t.getViewButtonText = getViewButtonText;







	// Language-data Internals

	// -----------------------------------------------------------------------------------

	// Apply overrides to the current language's data





	var localeData = createObject( // make a cheap copy

		getMomentLocaleData(options.lang) // will fall back to en

	);



	if (options.monthNames) {

		localeData._months = options.monthNames;

	}

	if (options.monthNamesShort) {

		localeData._monthsShort = options.monthNamesShort;

	}

	if (options.dayNames) {

		localeData._weekdays = options.dayNames;

	}

	if (options.dayNamesShort) {

		localeData._weekdaysShort = options.dayNamesShort;

	}

	if (options.firstDay != null) {

		var _week = createObject(localeData._week); // _week: { dow: # }

		_week.dow = options.firstDay;

		localeData._week = _week;

	}







	// 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;

	};





	// Produces a human-readable string for the given duration.

	// Side-effect: changes the locale of the given duration.

	function humanizeDuration(duration) {

		return (duration.locale || duration.lang).call(duration, options.lang) // works moment-pre-2.8

			.humanize();

	}





	

	// Imports

	// -----------------------------------------------------------------------------------





	EventManager.call(t, options);

	var isFetchNeeded = t.isFetchNeeded;

	var fetchEvents = t.fetchEvents;







	// Locals

	// -----------------------------------------------------------------------------------





	var _element = element[0];

	var header;

	var headerElement;

	var content;

	var tm; // for making theme classes

	var viewSpecCache = {};

	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.destroyView();

		}



		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(viewType) {

		renderView(0, viewType);

	}





	// Renders a view because of a date change, view-type change, or for the first time

	function renderView(delta, viewType) {

		ignoreWindowResize++;



		// if viewType is changing, destroy the old view

		if (currentView && viewType && currentView.type !== viewType) {

			header.deactivateButton(currentView.type);

			freezeContentHeight(); // prevent a scroll jump when view element is removed

			if (currentView.start) { // rendered before?

				currentView.destroyView();

			}

			currentView.el.remove();

			currentView = null;

		}



		// if viewType changed, or the view was never created, create a fresh view

		if (!currentView && viewType) {

			currentView = instantiateView(viewType);

			currentView.el =  $("<div class='fc-view fc-" + viewType + "-view' />").appendTo(content);

			header.activateButton(viewType);

		}



		if (currentView) {



			// let the view determine what the delta means

			if (delta < 0) {

				date = currentView.computePrevDate(date);

			}

			else if (delta > 0) {

				date = currentView.computeNextDate(date);

			}



			// 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.destroyView();

					}

					currentView.setDate(date);

					currentView.renderView();

					unfreezeContentHeight();



					// need to do this after View::render, so dates are calculated

					updateTitle();

					updateTodayButton();



					getAndRenderEvents();

				}

			}

		}



		unfreezeContentHeight(); // undo any lone freezeContentHeight calls

		ignoreWindowResize--;

	}







	// View Instantiation

	// -----------------------------------------------------------------------------------





	// Given a view name for a custom view or a standard view, creates a ready-to-go View object

	function instantiateView(viewType) {

		var spec = getViewSpec(viewType);



		return new spec['class'](t, spec.options, viewType);

	}





	// Gets information about how to create a view

	function getViewSpec(requestedViewType) {

		var allDefaultButtonText = options.defaultButtonText || {};

		var allButtonText = options.buttonText || {};

		var hash = options.views || {}; // the `views` option object

		var viewType = requestedViewType;

		var viewOptionsChain = [];

		var viewOptions;

		var viewClass;

		var duration, unit, unitIsSingle = false;

		var buttonText;



		if (viewSpecCache[requestedViewType]) {

			return viewSpecCache[requestedViewType];

		}



		function processSpecInput(input) {

			if (typeof input === 'function') {

				viewClass = input;

			}

			else if (typeof input === 'object') {

				$.extend(viewOptions, input);

			}

		}



		// iterate up a view's spec ancestor chain util we find a class to instantiate

		while (viewType && !viewClass) {

			viewOptions = {}; // only for this specific view in the ancestry

			processSpecInput(fcViews[viewType]); // $.fullCalendar.views, lower precedence

			processSpecInput(hash[viewType]); // options at initialization, higher precedence

			viewOptionsChain.unshift(viewOptions); // record older ancestors first

			viewType = viewOptions.type;

		}



		viewOptionsChain.unshift({}); // jQuery's extend needs at least one arg

		viewOptions = $.extend.apply($, viewOptionsChain); // combine all, newer ancestors overwritting old



		if (viewClass) {



			duration = viewOptions.duration || viewClass.duration;

			if (duration) {

				duration = moment.duration(duration);

				unit = computeIntervalUnit(duration);

				unitIsSingle = computeIntervalAs(unit, duration) === 1;

			}



			// options that are specified per the view's duration, like "week" or "day"

			if (unitIsSingle && hash[unit]) {

				viewOptions = $.extend({}, hash[unit], viewOptions); // lowest priority

			}



			// compute the final text for the button representing this view

			buttonText =

				allButtonText[requestedViewType] || // init options, like "agendaWeek"

				(unitIsSingle ? allButtonText[unit] : null) || // init options, like "week"

				allDefaultButtonText[requestedViewType] || // lang data, like "agendaWeek"

				(unitIsSingle ? allDefaultButtonText[unit] : null) || // lang data, like "week"

				viewOptions.buttonText ||

				viewClass.buttonText ||

				(duration ? humanizeDuration(duration) : null) ||

				requestedViewType;



			return (viewSpecCache[requestedViewType] = {

				'class': viewClass,

				options: viewOptions,

				buttonText: buttonText

			});

		}

	}





	// Returns a boolean about whether the view is okay to instantiate at some point

	function isValidViewType(viewType) {

		return Boolean(getViewSpec(viewType));

	}





	// Gets the text that should be displayed on a view's button in the header

	function getViewButtonText(viewType) {

		var spec = getViewSpec(viewType);



		if (spec) {

			return spec.buttonText;

		}

	}

	

	



	// 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.destroyViewEvents(); // no performance cost if never rendered

			currentView.renderViewEvents(events);

			unfreezeContentHeight();

		}

	}





	function destroyEvents() {

		freezeContentHeight();

		currentView.destroyViewEvents();

		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.computeTitle());

	}





	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: start, end: end }); // accepts a range

	}

	



	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.

	// `viewType` can be a specific view name or a generic one like "week" or "day".

	function zoomTo(newDate, viewType) {

		var viewStr;

		var match;



		if (!viewType || !isValidViewType(viewType)) { // a general view name, or "auto"

			viewType = viewType || '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(viewType)));



			// fall back to the day view being used in the header

			if (!match) {

				match = viewStr.match(/\w+Day/);

			}



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

		}



		date = newDate;

		changeView(viewType);

	}

	

	

	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 viewText; // highest priority

					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 (calendar.isValidViewType(buttonName)) { // a view type

							buttonClick = function() {

								calendar.changeView(buttonName);

							};

							viewsWithButtons.push(buttonName);

							viewText = calendar.getViewButtonText(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); // from languages

							customText = smartProperty(options.buttonText, buttonName);



							if (viewText || customText) {

								innerHtml = htmlEscape(viewText || 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;

	t.normalizeEventDateProps = normalizeEventDateProps;

	t.ensureVisibleEventRange = ensureVisibleEventRange;

	

	

	// imports

	var trigger = t.trigger;

	var getView = t.getView;

	var reportEvents = t.reportEvents;

	

	

	// 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

	-----------------------------------------------------------------------------*/





	// Only ever called from the externally-facing API

	function updateEvent(event) {



		// massage start/end values, even if date string values

		event.start = t.moment(event.start);

		if (event.end) {

			event.end = t.moment(event.end);

		}

		else {

			event.end = null;

		}



		mutateEvent(event, getMiscEventProps(event)); // will handle start/end/allDay normalization

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

	}





	// Returns a hash of misc event properties that should be copied over to related events.

	function getMiscEventProps(event) {

		var props = {};



		$.each(event, function(name, val) {

			if (isMiscEventPropName(name)) {

				if (val !== undefined && isAtomic(val)) { // a defined non-object

					props[name] = val;

				}

			}

		});



		return props;

	}



	// non-date-related, non-id-related, non-secret

	function isMiscEventPropName(name) {

		return !/^_|^(id|allDay|start|end)$/.test(name);

	}



	

	// returns the expanded events that were created

	function renderEvent(eventInput, stick) {

		var abstractEvent = buildEventFromInput(eventInput);

		var events;

		var i, event;



		if (abstractEvent) { // not false (a valid input)

			events = expandEvent(abstractEvent);



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

				event = events[i];



				if (!event.source) {

					if (stick) {

						stickySource.events.push(event);

						event.source = stickySource;

					}

					cache.push(event);

				}

			}



			reportEvents(cache);



			return events;

		}



		return [];

	}

	

	

	function removeEvents(filter) {

		var eventID;

		var i;



		if (filter == null) { // null or undefined. remove all events

			filter = function() { return true; }; // will always match

		}

		else if (!$.isFunction(filter)) { // an event ID

			eventID = filter + '';

			filter = function(event) {

				return event._id == eventID;

			};

		}



		// Purge event(s) from our local cache

		cache = $.grep(cache, filter, true); // inverse=true



		// Remove events from array sources.

		// This works because they have been converted to official Event Objects up front.

		// (and as a result, event._id has been calculated).

		for (i=0; i<sources.length; i++) {

			if ($.isArray(sources[i].events)) {

				sources[i].events = $.grep(sources[i].events, filter, true);

			}

		}



		reportEvents(cache);

	}

	

	

	function clientEvents(filter) {

		if ($.isFunction(filter)) {

			return $.grep(cache, filter);

		}

		else if (filter != null) { // not null, not undefined. an event ID

			filter += '';

			return $.grep(cache, function(e) {

				return e._id == filter;

			});

		}

		return cache; // else, return all

	}

	

	

	

	/* 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;



		if (options.eventDataTransform) {

			input = options.eventDataTransform(input);

		}

		if (source && source.eventDataTransform) {

			input = source.eventDataTransform(input);

		}



		// Copy all properties over to the resulting object.

		// The special-case properties will be copied over afterwards.

		$.extend(out, input);



		if (source) {

			out.source = source;

		}



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



		if (input.className) {

			if (typeof input.className == 'string') {

				out.className = input.className.split(/\s+/);

			}

			else { // assumed to be an array

				out.className = input.className;

			}

		}

		else {

			out.className = [];

		}



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

		end = input.end;



		// parse as a time (Duration) if applicable

		if (isTimeString(start)) {

			start = moment.duration(start);

		}

		if (isTimeString(end)) {

			end = moment.duration(end);

		}



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



			// the event is "abstract" (recurring) so don't calculate exact start/end dates just yet

			out.start = start ? moment.duration(start) : null; // will be a Duration or null

			out.end = end ? moment.duration(end) : null; // will be a Duration or null

			out._recurring = true; // our internal marker

		}

		else {



			if (start) {

				start = t.moment(start);

				if (!start.isValid()) {

					return false;

				}

			}



			if (end) {

				end = t.moment(end);

				if (!end.isValid()) {

					end = null; // let defaults take over

				}

			}



			allDay = input.allDay;

			if (allDay === undefined) { // still undefined? fallback to default

				allDay = firstDefined(

					source ? source.allDayDefault : undefined,

					options.allDayDefault

				);

				// still undefined? normalizeEventDateProps will calculate it

			}



			assignDatesToEvent(start, end, allDay, out);

		}



		return out;

	}





	// Normalizes and assigns the given dates to the given partially-formed event object.

	// NOTE: mutates the given start/end moments. does not make a copy.

	function assignDatesToEvent(start, end, allDay, event) {

		event.start = start;

		event.end = end;

		event.allDay = allDay;

		normalizeEventDateProps(event);

		backupEventDates(event);

	}





	// Ensures the allDay property exists.

	// Ensures the start/end dates are consistent with allDay and forceEventDuration.

	// Accepts an Event object, or a plain object with event-ish properties.

	// NOTE: Will modify the given object.

	function normalizeEventDateProps(props) {



		if (props.allDay == null) {

			props.allDay = !(props.start.hasTime() || (props.end && props.end.hasTime()));

		}



		if (props.allDay) {

			props.start.stripTime();

			if (props.end) {

				props.end.stripTime();

			}

		}

		else {

			if (!props.start.hasTime()) {

				props.start = t.rezoneDate(props.start); // will also give it a 00:00 time

			}

			if (props.end && !props.end.hasTime()) {

				props.end = t.rezoneDate(props.end); // will also give it a 00:00 time

			}

		}



		if (props.end && !props.end.isAfter(props.start)) {

			props.end = null;

		}



		if (!props.end) {

			if (options.forceEventDuration) {

				props.end = t.getDefaultEventEnd(props.allDay, props.start);

			}

			else {

				props.end = null;

			}

		}

	}





	// If `range` is a proper range with a start and end, returns the original object.

	// If missing an end, computes a new range with an end, computing it as if it were an event.

	// TODO: make this a part of the event -> eventRange system

	function ensureVisibleEventRange(range) {

		var allDay;



		if (!range.end) {



			allDay = range.allDay; // range might be more event-ish than we think

			if (allDay == null) {

				allDay = !range.start.hasTime();

			}



			range = {

				start: range.start,

				end: t.getDefaultEventEnd(allDay, range.start)

			};

		}

		return range;

	}





	// If the given event is a recurring event, break it down into an array of individual instances.

	// If not a recurring event, return an array with the single original event.

	// If given a falsy input (probably because of a failed buildEventFromInput call), returns an empty array.

	// HACK: can override the recurring window by providing custom rangeStart/rangeEnd (for businessHours).

	function expandEvent(abstractEvent, _rangeStart, _rangeEnd) {

		var events = [];

		var dowHash;

		var dow;

		var i;

		var date;

		var startTime, endTime;

		var start, end;

		var event;



		_rangeStart = _rangeStart || rangeStart;

		_rangeEnd = _rangeEnd || rangeEnd;



		if (abstractEvent) {

			if (abstractEvent._recurring) {



				// make a boolean hash as to whether the event occurs on each day-of-week

				if ((dow = abstractEvent.dow)) {

					dowHash = {};

					for (i = 0; i < dow.length; i++) {

						dowHash[dow[i]] = true;

					}

				}



				// iterate through every day in the current range

				date = _rangeStart.clone().stripTime(); // holds the date of the current day

				while (date.isBefore(_rangeEnd)) {



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



						startTime = abstractEvent.start; // the stored start and end properties are times (Durations)

						endTime = abstractEvent.end; // "

						start = date.clone();

						end = null;



						if (startTime) {

							start = start.time(startTime);

						}

						if (endTime) {

							end = date.clone().time(endTime);

						}



						event = $.extend({}, abstractEvent); // make a copy of the original

						assignDatesToEvent(

							start, end,

							!startTime && !endTime, // allDay?

							event

						);

						events.push(event);

					}



					date.add(1, 'days');

				}

			}

			else {

				events.push(abstractEvent); // return the original event. will be a one-item array

			}

		}



		return events;

	}







	/* Event Modification Math

	-----------------------------------------------------------------------------------------*/





	// Modifies an event and all related events by applying the given properties.

	// Special date-diffing logic is used for manipulation of dates.

	// If `props` does not contain start/end dates, the updated values are assumed to be the event's current start/end.

	// All date comparisons are done against the event's pristine _start and _end dates.

	// Returns an object with delta information and a function to undo all operations.

	//

	function mutateEvent(event, props) {

		var miscProps = {};

		var clearEnd;

		var dateDelta;

		var durationDelta;

		var undoFunc;



		props = props || {};



		// ensure new date-related values to compare against

		if (!props.start) {

			props.start = event.start.clone();

		}

		if (props.end === undefined) {

			props.end = event.end ? event.end.clone() : null;

		}

		if (props.allDay == null) { // is null or undefined?

			props.allDay = event.allDay;

		}



		normalizeEventDateProps(props); // massages start/end/allDay



		// clear the end date if explicitly changed to null

		clearEnd = event._end !== null && props.end === null;



		// compute the delta for moving the start and end dates together

		if (props.allDay) {

			dateDelta = diffDay(props.start, event._start); // whole-day diff from start-of-day

		}

		else {

			dateDelta = diffDayTime(props.start, event._start);

		}



		// compute the delta for moving the end date (after applying dateDelta)

		if (!clearEnd && props.end) {

			durationDelta = diffDayTime(

				// new duration

				props.end,

				props.start

			).subtract(diffDayTime(

				// subtract old duration

				event._end || t.getDefaultEventEnd(event._allDay, event._start),

				event._start

			));

		}



		// gather all non-date-related properties

		$.each(props, function(name, val) {

			if (isMiscEventPropName(name)) {

				if (val !== undefined) {

					miscProps[name] = val;

				}

			}

		});



		// apply the operations to the event and all related events

		undoFunc = mutateEvents(

			clientEvents(event._id), // get events with this ID

			clearEnd,

			props.allDay,

			dateDelta,

			durationDelta,

			miscProps

		);



		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

	// - assign `miscProps` to the event

	//

	// Returns a function that can be called to undo all the operations.

	//

	// TODO: don't use so many closures. possible memory issues when lots of events with same ID.

	//

	function mutateEvents(events, clearEnd, allDay, dateDelta, durationDelta, miscProps) {

		var isAmbigTimezone = t.getIsAmbigTimezone();

		var undoFunctions = [];



		// normalize zero-length deltas to be null

		if (dateDelta && !dateDelta.valueOf()) { dateDelta = null; }

		if (durationDelta && !durationDelta.valueOf()) { durationDelta = null; }



		$.each(events, function(i, event) {

			var oldProps;

			var newProps;



			// build an object holding all the old values, both date-related and misc.

			// for the undo function.

			oldProps = {

				start: event.start.clone(),

				end: event.end ? event.end.clone() : null,

				allDay: event.allDay

			};

			$.each(miscProps, function(name) {

				oldProps[name] = event[name];

			});



			// new date-related properties. work off the original date snapshot.

			// ok to use references because they will be thrown away when backupEventDates is called.

			newProps = {

				start: event._start,

				end: event._end,

				allDay: event._allDay

			};



			if (clearEnd) {

				newProps.end = null;

			}



			newProps.allDay = allDay;



			normalizeEventDateProps(newProps); // massages start/end/allDay



			if (dateDelta) {

				newProps.start.add(dateDelta);

				if (newProps.end) {

					newProps.end.add(dateDelta);

				}

			}



			if (durationDelta) {

				if (!newProps.end) {

					newProps.end = t.getDefaultEventEnd(newProps.allDay, newProps.start);

				}

				newProps.end.add(durationDelta);

			}



			// if the dates have changed, and we know it is impossible to recompute the

			// timezone offsets, strip the zone.

			if (

				isAmbigTimezone &&

				!newProps.allDay &&

				(dateDelta || durationDelta)

			) {

				newProps.start.stripZone();

				if (newProps.end) {

					newProps.end.stripZone();

				}

			}



			$.extend(event, miscProps, newProps); // copy over misc props, then date-related props

			backupEventDates(event); // regenerate internal _start/_end/_allDay



			undoFunctions.push(function() {

				$.extend(event, oldProps);

				backupEventDates(event); // regenerate internal _start/_end/_allDay

			});

		});



		return function() {

			for (var i = 0; i < undoFunctions.length; i++) {

				undoFunctions[i]();

			}

		};

	}





	/* Business Hours

	-----------------------------------------------------------------------------------------*/



	t.getBusinessHoursEvents = getBusinessHoursEvents;





	// Returns an array of events as to when the business hours occur in the given view.

	// Abuse of our event system :(

	function getBusinessHoursEvents() {

		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.isEventRangeAllowed = isEventRangeAllowed;

	t.isSelectionRangeAllowed = isSelectionRangeAllowed;

	t.isExternalDropRangeAllowed = isExternalDropRangeAllowed;





	function isEventRangeAllowed(range, event) {

		var source = event.source || {};

		var constraint = firstDefined(

			event.constraint,

			source.constraint,

			options.eventConstraint

		);

		var overlap = firstDefined(

			event.overlap,

			source.overlap,

			options.eventOverlap

		);



		range = ensureVisibleEventRange(range); // ensure a proper range with an end for isRangeAllowed



		return isRangeAllowed(range, constraint, overlap, event);

	}





	function isSelectionRangeAllowed(range) {

		return isRangeAllowed(range, options.selectConstraint, options.selectOverlap);

	}





	// when `eventProps` is defined, consider this an event.

	// `eventProps` can contain misc non-date-related info about the event.

	function isExternalDropRangeAllowed(range, eventProps) {

		var eventInput;

		var event;



		// note: very similar logic is in View's reportExternalDrop

		if (eventProps) {

			eventInput = $.extend({}, eventProps, range);

			event = expandEvent(buildEventFromInput(eventInput))[0];

		}



		if (event) {

			return isEventRangeAllowed(range, event);

		}

		else { // treat it as a selection



			range = ensureVisibleEventRange(range); // ensure a proper range with an end for isSelectionRangeAllowed



			return isSelectionRangeAllowed(range);

		}

	}





	// Returns true if the given range (caused by an event drop/resize or a selection) is allowed to exist

	// according to the constraint/overlap settings.

	// `event` is not required if checking a selection.

	function isRangeAllowed(range, constraint, overlap, event) {

		var constraintEvents;

		var anyContainment;

		var i, otherEvent;

		var otherOverlap;



		// normalize. fyi, we're normalizing in too many places :(

		range = {

			start: range.start.clone().stripZone(),

			end: range.end.clone().stripZone()

		};



		// the range must be fully contained by at least one of produced constraint events

		if (constraint != null) {



			// not treated as an event! intermediate data structure

			// TODO: use ranges in the future

			constraintEvents = constraintToEvents(constraint);



			anyContainment = false;

			for (i = 0; i < constraintEvents.length; i++) {

				if (eventContainsRange(constraintEvents[i], range)) {

					anyContainment = true;

					break;

				}

			}



			if (!anyContainment) {

				return false;

			}

		}



		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, range)) {



				// 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

	}





	// Does the event's date range fully contain the given range?

	// start/end already assumed to have stripped zones :(

	function eventContainsRange(event, range) {

		var eventStart = event.start.clone().stripZone();

		var eventEnd = t.getEventEnd(event).stripZone();



		return range.start >= eventStart && range.end <= eventEnd;

	}





	// Does the event's date range intersect with the given range?

	// start/end already assumed to have stripped zones :(

	function eventIntersectsRange(event, range) {

		var eventStart = event.start.clone().stripZone();

		var eventEnd = t.getEventEnd(event).stripZone();



		return range.start < eventEnd && range.end > eventStart;

	}



}





// updates the "backup" properties, which are preserved in order to compute diffs later on.

function backupEventDates(event) {

	event._allDay = event.allDay;

	event._start = event.start.clone();

	event._end = event.end ? event.end.clone() : null;

}



    /* An abstract class for the "basic" views, as well as month view. Renders one or more rows of day cells.

----------------------------------------------------------------------------------------------------------------------*/

// It is a manager for a DayGrid subcomponent, which does most of the heavy lifting.

// It is responsible for managing width/height.



var BasicView = fcViews.basic = View.extend({



	dayGrid: null, // the main subcomponent that does most of the heavy lifting



	dayNumbersVisible: false, // display day numbers on each day cell?

	weekNumbersVisible: false, // display week numbers along the side?



	weekNumberWidth: null, // width of all the week-number cells running down the side



	headRowEl: null, // the fake row element of the day-of-week header





	initialize: function() {

		this.dayGrid = new DayGrid(this);

		this.coordMap = this.dayGrid.coordMap; // the view's date-to-cell mapping is identical to the subcomponent's

	},





	// Sets the display range and computes all necessary dates

	setRange: function(range) {

		View.prototype.setRange.call(this, range); // call the super-method



		this.dayGrid.breakOnWeeks = /year|month|week/.test(this.intervalUnit); // do before setRange

		this.dayGrid.setRange(range);

	},





	// Compute the value to feed into setRange. Overrides superclass.

	computeRange: function(date) {

		var range = View.prototype.computeRange.call(this, date); // get value from the super-method



		// year and month views should be aligned with weeks. this is already done for week

		if (/year|month/.test(range.intervalUnit)) {

			range.start.startOf('week');

			range.start = this.skipHiddenDays(range.start);



			// make end-of-week if not already

			if (range.end.weekday()) {

				range.end.add(1, 'week').startOf('week');

				range.end = this.skipHiddenDays(range.end, -1, true); // exclusively move backwards

			}

		}



		return range;

	},





	// Renders the view into `this.el`, which should already be assigned

	render: function() {



		this.dayNumbersVisible = this.dayGrid.rowCnt > 1; // TODO: make grid responsible

		this.weekNumbersVisible = this.opt('weekNumbers');

		this.dayGrid.numbersVisible = this.dayNumbersVisible || this.weekNumbersVisible;



		this.el.addClass('fc-basic-view').html(this.renderHtml());



		this.headRowEl = this.el.find('thead .fc-row');



		this.scrollerEl = this.el.find('.fc-day-grid-container');

		this.dayGrid.coordMap.containerEl = this.scrollerEl; // constrain clicks/etc to the dimensions of the scroller



		this.dayGrid.el = this.el.find('.fc-day-grid');

		this.dayGrid.render(this.hasRigidRows());

	},





	// 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.dayGrid.getCell(row, 0).start) +

					'</span>' +

				'</td>';

		}

	},





	// Generates the HTML that goes before the day bg cells for each day-row.

	// Queried by the DayGrid subcomponent. Ordering depends on isRTL.

	dayIntroHtml: function() {

		if (this.weekNumbersVisible) {

			return '<td class="fc-week-number ' + this.widgetContentClass + '" ' +

				this.weekNumberStyleAttr() + '></td>';

		}

	},





	// Generates the HTML that goes before every other type of row generated by DayGrid. Ordering depends on isRTL.

	// Affects helper-skeleton and highlight-skeleton rows.

	introHtml: function() {

		if (this.weekNumbersVisible) {

			return '<td class="fc-week-number" ' + this.weekNumberStyleAttr() + '></td>';

		}

	},





	// Generates the HTML for the <td>s of the "number" row in the DayGrid's content skeleton.

	// The number row will only exist if either day numbers or week numbers are turned on.

	numberCellHtml: function(cell) {

		var date = cell.start;

		var classes;



		if (!this.dayNumbersVisible) { // if there are week numbers but not day numbers

			return '<td/>'; //  will create an empty space above events :(

		}



		classes = this.dayGrid.getDayClasses(date);

		classes.unshift('fc-day-number');



		return '' +

			'<td class="' + classes.join(' ') + '" data-date="' + date.format() + '">' +

				date.date() +

			'</td>';

	},





	// Generates an HTML attribute string for setting the width of the week number column, if it is known

	weekNumberStyleAttr: function() {

		if (this.weekNumberWidth !== null) {

			return 'style="width:' + this.weekNumberWidth + 'px"';

		}

		return '';

	},





	// Determines whether each row should have a constant height

	hasRigidRows: function() {

		var eventLimit = this.opt('eventLimit');

		return eventLimit && typeof eventLimit !== 'number';

	},





	/* Dimensions

	------------------------------------------------------------------------------------------------------------------*/





	// Refreshes the horizontal dimensions of the view

	updateWidth: function() {

		if (this.weekNumbersVisible) {

			// Make sure all week number cells running down the side have the same width.

			// Record the width for cells created later.

			this.weekNumberWidth = matchCellWidths(

				this.el.find('.fc-week-number')

			);

		}

	},





	// Adjusts the vertical dimensions of the view to the specified values

	setHeight: function(totalHeight, isAuto) {

		var eventLimit = this.opt('eventLimit');

		var scrollerHeight;



		// reset all heights to be natural

		unsetScroller(this.scrollerEl);

		uncompensateScroll(this.headRowEl);



		this.dayGrid.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

	},





	// Retrieves all segment objects that are rendered in the view

	getEventSegs: function() {

		return this.dayGrid.getEventSegs();

	},





	// Unrenders all event elements and clears internal segment data

	destroyEvents: function() {

		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

	},





	/* Dragging (for both events and external elements)

	------------------------------------------------------------------------------------------------------------------*/





	// A returned value of `true` signals that a mock "helper" event has been rendered.

	renderDrag: function(dropLocation, seg) {

		return this.dayGrid.renderDrag(dropLocation, seg);

	},





	destroyDrag: function() {

		this.dayGrid.destroyDrag();

	},





	/* Selection

	------------------------------------------------------------------------------------------------------------------*/





	// Renders a visual indication of a selection

	renderSelection: function(range) {

		this.dayGrid.renderSelection(range);

	},





	// 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

});



var MonthView = fcViews.month = BasicView.extend({



	// Produces information about what range to display

	computeRange: function(date) {

		var range = BasicView.prototype.computeRange.call(this, date); // get value from super-method



		if (this.isFixedWeeks()) {

			// ensure 6 weeks

			range.end.add(

				6 - range.end.diff(range.start, 'weeks'),

				'weeks'

			);

		}



		return range;

	},





	// Overrides the default BasicView behavior to have special multi-week auto-height logic

	setGridHeight: function(height, isAuto) {



		isAuto = isAuto || this.opt('weekMode') === 'variable'; // LEGACY: weekMode is deprecated



		// if auto, make the height of each row the height that it would be if there were 6 weeks

		if (isAuto) {

			height *= this.rowCnt / 6;

		}



		distributeHeight(this.dayGrid.rowEls, height, !isAuto); // if auto, don't compensate for height-hogging rows

	},





	isFixedWeeks: function() {

		var weekMode = this.opt('weekMode'); // LEGACY: weekMode is deprecated

		if (weekMode) {

			return weekMode === 'fixed'; // if any other type of weekMode, assume NOT fixed

		}



		return this.opt('fixedWeekCount');

	}



});



MonthView.duration = { months: 1 };



    /* A week view with simple day cells running horizontally

----------------------------------------------------------------------------------------------------------------------*/



fcViews.basicWeek = {

	type: 'basic',

	duration: { weeks: 1 }

};

    /* A view with a single simple day cell

----------------------------------------------------------------------------------------------------------------------*/



fcViews.basicDay = {

	type: 'basic',

	duration: { days: 1 }

};

    /* 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',

	minTime: '00:00:00',

	maxTime: '24:00:00',

	slotEventOverlap: true

});



var AGENDA_ALL_DAY_EVENT_LIMIT = 5;



fcViews.agenda = View.extend({ // AgendaView



	timeGrid: null, // the main time-grid subcomponent of this view

	dayGrid: null, // the "all-day" subcomponent. if all-day is turned off, this will be null



	axisWidth: null, // the width of the time axis running down the side



	noScrollRowEls: null, // set of fake row elements that must compensate when scrollerEl has scrollbars



	// when the time-grid isn't tall enough to occupy the given height, we render an <hr> underneath

	bottomRuleEl: null,

	bottomRuleHeight: null,





	initialize: function() {

		this.timeGrid = new TimeGrid(this);



		if (this.opt('allDaySlot')) { // should we display the "all-day" area?

			this.dayGrid = new DayGrid(this); // the all-day subcomponent of this view



			// the coordinate grid will be a combination of both subcomponents' grids

			this.coordMap = new ComboCoordMap([

				this.dayGrid.coordMap,

				this.timeGrid.coordMap

			]);

		}

		else {

			this.coordMap = this.timeGrid.coordMap;

		}

	},





	/* Rendering

	------------------------------------------------------------------------------------------------------------------*/





	// Sets the display range and computes all necessary dates

	setRange: function(range) {

		View.prototype.setRange.call(this, range); // call the super-method



		this.timeGrid.setRange(range);

		if (this.dayGrid) {

			this.dayGrid.setRange(range);

		}

	},





	// Renders the view into `this.el`, which has already been assigned

	render: function() {



		this.el.addClass('fc-agenda-view').html(this.renderHtml());



		// the element that wraps the time-grid that will probably scroll

		this.scrollerEl = this.el.find('.fc-time-grid-container');

		this.timeGrid.coordMap.containerEl = this.scrollerEl; // don't accept clicks/etc outside of this



		this.timeGrid.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

	},





	// 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.timeGrid.getCell(0).start;

			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 initial pre-configured state prior to allowing the user to change it

	initializeScroll: 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();

	},





	// Retrieves all segment objects that are rendered in the view

	getEventSegs: function() {

		return this.timeGrid.getEventSegs().concat(

			this.dayGrid ? this.dayGrid.getEventSegs() : []

		);

	},





	// Unrenders all event elements and clears internal segment data

	destroyEvents: function() {



		// 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

	},





	/* Dragging (for events and external elements)

	------------------------------------------------------------------------------------------------------------------*/





	// A returned value of `true` signals that a mock "helper" event has been rendered.

	renderDrag: function(dropLocation, seg) {

		if (dropLocation.start.hasTime()) {

			return this.timeGrid.renderDrag(dropLocation, seg);

		}

		else if (this.dayGrid) {

			return this.dayGrid.renderDrag(dropLocation, seg);

		}

	},





	destroyDrag: function() {

		this.timeGrid.destroyDrag();

		if (this.dayGrid) {

			this.dayGrid.destroyDrag();

		}

	},





	/* Selection

	------------------------------------------------------------------------------------------------------------------*/





	// Renders a visual indication of a selection

	renderSelection: function(range) {

		if (range.start.hasTime() || range.end.hasTime()) {

			this.timeGrid.renderSelection(range);

		}

		else if (this.dayGrid) {

			this.dayGrid.renderSelection(range);

		}

	},





	// Unrenders a visual indications of a selection

	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

----------------------------------------------------------------------------------------------------------------------*/



fcViews.agendaWeek = {

	type: 'agenda',

	duration: { weeks: 1 }

};

    /* A day view with an all-day cell area at the top, and a time grid below

----------------------------------------------------------------------------------------------------------------------*/



fcViews.agendaDay = {

	type: 'agenda',

	duration: { days: 1 }

};

});