fullcalendar/src/common/View.js

/* An abstract class from which other views inherit from
----------------------------------------------------------------------------------------------------------------------*/

var View = FC.View = Model.extend({

	type: null, // subclass' view name (string)
	name: null, // deprecated. use `type` instead
	title: null, // the text that will be displayed in the header's title

	calendar: null, // owner Calendar object
	viewSpec: null,
	options: null, // hash containing all options. already merged with view-specific-options
	el: null, // the view's containing element. set by Calendar

	renderQueue: null,
	isDatesRendered: false,
	isEventsRendered: false,
	isBaseRendered: false, // related to viewRender/viewDestroy triggers

	isRTL: false,
	isSelected: false, // boolean whether a range of time is user-selected or not
	selectedEvent: null,

	eventOrderSpecs: null, // criteria for ordering events when they have same date/time

	// classNames styled by jqui themes
	widgetHeaderClass: null,
	widgetContentClass: null,
	highlightStateClass: null,

	// for date utils, computed from options
	nextDayThreshold: null,
	isHiddenDayHash: null,

	// now indicator
	isNowIndicatorRendered: null,
	initialNowDate: null, // result first getNow call
	initialNowQueriedMs: null, // ms time the getNow was called
	nowIndicatorTimeoutID: null, // for refresh timing of now indicator
	nowIndicatorIntervalID: null, // "


	constructor: function(calendar, viewSpec) {
		Model.prototype.constructor.call(this);

		this.calendar = calendar;
		this.viewSpec = viewSpec;

		// shortcuts
		this.type = viewSpec.type;
		this.options = viewSpec.options;

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

		this.nextDayThreshold = moment.duration(this.opt('nextDayThreshold'));
		this.initThemingProps();
		this.initHiddenDays();
		this.isRTL = this.opt('isRTL');

		this.eventOrderSpecs = parseFieldSpecs(this.opt('eventOrder'));

		// TODO: differentiate eventRenderWait from date rendering
		this.renderQueue = new TaskQueue(this.opt('eventRenderWait'));

		this.initialize();
	},


	// A good place for subclasses to initialize member variables
	initialize: function() {
		// subclasses can implement
	},


	// Retrieves an option with the given name
	opt: function(name) {
		return this.options[name];
	},


	// Triggers handlers that are view-related. Modifies args before passing to calendar.
	publiclyTrigger: function(name, thisObj) { // arguments beyond thisObj are passed along
		var calendar = this.calendar;

		return calendar.publiclyTrigger.apply(
			calendar,
			[name, thisObj || this].concat(
				Array.prototype.slice.call(arguments, 2), // arguments beyond thisObj
				[ this ] // always make the last argument a reference to the view. TODO: deprecate
			)
		);
	},


	/* Title and Date Formatting
	------------------------------------------------------------------------------------------------------------------*/


	// Sets the view's title property to the most updated computed value
	updateTitle: function() {
		this.title = this.computeTitle();
		this.calendar.setToolbarsTitle(this.title);
	},


	// Computes what the title at the top of the calendar should be for this view
	computeTitle: function() {
		var range;

		// for views that span a large unit of time, show the proper interval, ignoring stray days before and after
		if (/^(year|month)$/.test(this.currentRangeUnit)) {
			range = this.currentRange;
		}
		else { // for day units or smaller, use the actual day range
			range = this.activeRange;
		}

		return this.formatRange(
			{
				// in case currentRange has a time, make sure timezone is correct
				start: this.calendar.applyTimezone(range.start),
				end: this.calendar.applyTimezone(range.end)
			},
			this.opt('titleFormat') || this.computeTitleFormat(),
			this.opt('titleRangeSeparator')
		);
	},


	// Generates the format string that should be used to generate the title for the current date range.
	// Attempts to compute the most appropriate format if not explicitly specified with `titleFormat`.
	computeTitleFormat: function() {
		if (this.currentRangeUnit == 'year') {
			return 'YYYY';
		}
		else if (this.currentRangeUnit == 'month') {
			return this.opt('monthYearFormat'); // like "September 2014"
		}
		else if (this.currentRangeAs('days') > 1) {
			return 'll'; // multi-day range. shorter, like "Sep 9 - 10 2014"
		}
		else {
			return 'LL'; // one day. longer, like "September 9 2014"
		}
	},


	// Utility for formatting a range. Accepts a range object, formatting string, and optional separator.
	// Displays all-day ranges naturally, with an inclusive end. Takes the current isRTL into account.
	// The timezones of the dates within `range` will be respected.
	formatRange: function(range, formatStr, separator) {
		var end = range.end;

		if (!end.hasTime()) { // all-day?
			end = end.clone().subtract(1); // convert to inclusive. last ms of previous day
		}

		return formatRange(range.start, end, formatStr, separator, this.opt('isRTL'));
	},


	getAllDayHtml: function() {
		return this.opt('allDayHtml') || htmlEscape(this.opt('allDayText'));
	},


	/* Navigation
	------------------------------------------------------------------------------------------------------------------*/


	// Generates HTML for an anchor to another view into the calendar.
	// Will either generate an <a> tag or a non-clickable <span> tag, depending on enabled settings.
	// `gotoOptions` can either be a moment input, or an object with the form:
	// { date, type, forceOff }
	// `type` is a view-type like "day" or "week". default value is "day".
	// `attrs` and `innerHtml` are use to generate the rest of the HTML tag.
	buildGotoAnchorHtml: function(gotoOptions, attrs, innerHtml) {
		var date, type, forceOff;
		var finalOptions;

		if ($.isPlainObject(gotoOptions)) {
			date = gotoOptions.date;
			type = gotoOptions.type;
			forceOff = gotoOptions.forceOff;
		}
		else {
			date = gotoOptions; // a single moment input
		}
		date = FC.moment(date); // if a string, parse it

		finalOptions = { // for serialization into the link
			date: date.format('YYYY-MM-DD'),
			type: type || 'day'
		};

		if (typeof attrs === 'string') {
			innerHtml = attrs;
			attrs = null;
		}

		attrs = attrs ? ' ' + attrsToStr(attrs) : ''; // will have a leading space
		innerHtml = innerHtml || '';

		if (!forceOff && this.opt('navLinks')) {
			return '<a' + attrs +
				' data-goto="' + htmlEscape(JSON.stringify(finalOptions)) + '">' +
				innerHtml +
				'</a>';
		}
		else {
			return '<span' + attrs + '>' +
				innerHtml +
				'</span>';
		}
	},


	// Rendering Non-date-related Content
	// -----------------------------------------------------------------------------------------------------------------


	// Sets the container element that the view should render inside of, does global DOM-related initializations,
	// and renders all the non-date-related content inside.
	setElement: function(el) {
		this.el = el;
		this.bindGlobalHandlers();
		this.bindBaseRenderHandlers();
		this.renderSkeleton();
	},


	// Removes the view's container element from the DOM, clearing any content beforehand.
	// Undoes any other DOM-related attachments.
	removeElement: function() {
		this.unsetDate();
		this.unrenderSkeleton();

		this.unbindGlobalHandlers();
		this.unbindBaseRenderHandlers();

		this.el.remove();
		// NOTE: don't null-out this.el in case the View was destroyed within an API callback.
		// We don't null-out the View's other jQuery element references upon destroy,
		//  so we shouldn't kill this.el either.
	},


	// Renders the basic structure of the view before any content is rendered
	renderSkeleton: function() {
		// subclasses should implement
	},


	// Unrenders the basic structure of the view
	unrenderSkeleton: function() {
		// subclasses should implement
	},


	// Date Setting/Unsetting
	// -----------------------------------------------------------------------------------------------------------------


	setDate: function(date, forcedScroll) {
		var currentDateProfile = this.get('dateProfile');
		var newDateProfile = this.buildDateProfile(date, null, true); // forceToValid=true

		if (
			!currentDateProfile ||
			!isRangesEqual(currentDateProfile.activeRange, newDateProfile.activeRange)
		) {
			this.setDateProfile(newDateProfile, forcedScroll);
		}

		return newDateProfile.date;
	},


	unsetDate: function() {
		if (this.has('dateProfile')) {
			this.unsetDateProfile();
		}
	},


	setDateProfile: function(dateProfile, forcedScroll) {
		var _this = this;

		// render first, so that dependants of dateProfile know rendering already happened
		this.renderQueue.add(function() {
			_this.executeDateRender(dateProfile, forcedScroll);
		});

		this.set('dateProfile', dateProfile); // for watchers
	},


	unsetDateProfile: function() {
		var _this = this;

		this.unset('dateProfile'); // for watchers. let them react before unrendering.

		this.renderQueue.add(function() {
			_this.executeDateUnrender();
		});
	},


	// Event Data
	// -----------------------------------------------------------------------------------------------------------------


	fetchInitialEvents: function(dateProfile) {
		return this.calendar.requestEvents(
			dateProfile.activeRange.start,
			dateProfile.activeRange.end
		);
	},


	bindEventChanges: function() {
		var _this = this;

		this.listenTo(this.calendar, 'eventsReset', function(events) {
			_this.setEvents(events);
		});
	},


	unbindEventChanges: function() {
		this.stopListeningTo(this.calendar, 'eventsReset');
		this.unsetEvents();
	},


	setEvents: function(events) {
		var _this = this;

		// render first, so that dependants of bindingEvents/currentEvents know rendering already happened
		this.renderQueue.add(function() {
			_this.executeEventsRender(events);
		});

		this.set('currentEvents', events); // for watchers
	},


	unsetEvents: function() {
		var _this = this;

		this.unset('currentEvents'); // for watchers. let them react before unrendering.

		this.renderQueue.add(function() {
			_this.executeEventsUnrender();
		});
	},


	// Date High-level Rendering
	// -----------------------------------------------------------------------------------------------------------------


	// if dateProfile not specified, uses current
	executeDateRender: function(dateProfile, forcedScroll) {
		var scroll;

		this.setDateProfileForRendering(dateProfile);
		this.updateTitle();
		this.calendar.updateToolbarButtons();

		scroll = forcedScroll || this.queryScroll();
		this.freezeHeight();

		this.executeDateUnrender(true);

		if (this.render) {
			this.render(); // TODO: deprecate
		}

		this.renderDates();
		this.updateSize();
		this.renderBusinessHours(); // might need coordinates, so should go after updateSize()
		this.startNowIndicator();

		this.thawHeight();

		if (!forcedScroll) {
			$.extend(scroll, this.computeInitialDateScroll());
		}
		this.applyScroll(scroll);

		this.isDatesRendered = true;
		this.trigger('datesRendered');
	},


	executeDateUnrender: function(willRender) {
		var scroll;

		if (this.isDatesRendered) {

			if (!willRender) {
				scroll = this.queryScroll();
				this.freezeHeight();
			}

			this.unselect();
			this.stopNowIndicator();

			this.trigger('before:datesUnrendered');

			this.unrenderBusinessHours();
			this.unrenderDates();

			if (this.destroy) {
				this.destroy(); // TODO: deprecate
			}

			if (!willRender) {
				this.thawHeight();
				this.applyScroll(scroll);
			}

			this.isDatesRendered = false;
		}
	},


	// Date Low-level Rendering
	// -----------------------------------------------------------------------------------------------------------------


	// date-cell content only
	renderDates: function() {
		// subclasses should implement
	},


	// date-cell content only
	unrenderDates: function() {
		// subclasses should override
	},


	// Determing when the "meat" of the view is rendered (aka the base)
	// -----------------------------------------------------------------------------------------------------------------


	bindBaseRenderHandlers: function() {
		var _this = this;

		this.on('datesRendered.baseHandler', function() {
			_this.onBaseRender();
		});

		this.on('before:datesUnrendered.baseHandler', function() {
			_this.onBeforeBaseUnrender();
		});
	},


	unbindBaseRenderHandlers: function() {
		this.off('.baseHandler');
	},


	onBaseRender: function() {
		this.publiclyTrigger('viewRender', this, this, this.el);
	},


	onBeforeBaseUnrender: function() {
		this.publiclyTrigger('viewDestroy', this, this, this.el);
	},


	// Misc view rendering utils
	// -----------------------------------------------------------------------------------------------------------------


	// Binds DOM handlers to elements that reside outside the view container, such as the document
	bindGlobalHandlers: function() {
		this.listenTo(GlobalEmitter.get(), {
			touchstart: this.processUnselect,
			mousedown: this.handleDocumentMousedown
		});
	},


	// Unbinds DOM handlers from elements that reside outside the view container
	unbindGlobalHandlers: function() {
		this.stopListeningTo(GlobalEmitter.get());
	},


	// Initializes internal variables related to theming
	initThemingProps: function() {
		var tm = this.opt('theme') ? 'ui' : 'fc';

		this.widgetHeaderClass = tm + '-widget-header';
		this.widgetContentClass = tm + '-widget-content';
		this.highlightStateClass = tm + '-state-highlight';
	},


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


	// Renders business-hours onto the view. Assumes updateSize has already been called.
	renderBusinessHours: function() {
		// subclasses should implement
	},


	// Unrenders previously-rendered business-hours
	unrenderBusinessHours: function() {
		// subclasses should implement
	},


	/* Now Indicator
	------------------------------------------------------------------------------------------------------------------*/


	// Immediately render the current time indicator and begins re-rendering it at an interval,
	// which is defined by this.getNowIndicatorUnit().
	// TODO: somehow do this for the current whole day's background too
	startNowIndicator: function() {
		var _this = this;
		var unit;
		var update;
		var delay; // ms wait value

		if (this.opt('nowIndicator')) {
			unit = this.getNowIndicatorUnit();
			if (unit) {
				update = proxy(this, 'updateNowIndicator'); // bind to `this`

				this.initialNowDate = this.calendar.getNow();
				this.initialNowQueriedMs = +new Date();
				this.renderNowIndicator(this.initialNowDate);
				this.isNowIndicatorRendered = true;

				// wait until the beginning of the next interval
				delay = this.initialNowDate.clone().startOf(unit).add(1, unit) - this.initialNowDate;
				this.nowIndicatorTimeoutID = setTimeout(function() {
					_this.nowIndicatorTimeoutID = null;
					update();
					delay = +moment.duration(1, unit);
					delay = Math.max(100, delay); // prevent too frequent
					_this.nowIndicatorIntervalID = setInterval(update, delay); // update every interval
				}, delay);
			}
		}
	},


	// rerenders the now indicator, computing the new current time from the amount of time that has passed
	// since the initial getNow call.
	updateNowIndicator: function() {
		if (this.isNowIndicatorRendered) {
			this.unrenderNowIndicator();
			this.renderNowIndicator(
				this.initialNowDate.clone().add(new Date() - this.initialNowQueriedMs) // add ms
			);
		}
	},


	// Immediately unrenders the view's current time indicator and stops any re-rendering timers.
	// Won't cause side effects if indicator isn't rendered.
	stopNowIndicator: function() {
		if (this.isNowIndicatorRendered) {

			if (this.nowIndicatorTimeoutID) {
				clearTimeout(this.nowIndicatorTimeoutID);
				this.nowIndicatorTimeoutID = null;
			}
			if (this.nowIndicatorIntervalID) {
				clearTimeout(this.nowIndicatorIntervalID);
				this.nowIndicatorIntervalID = null;
			}

			this.unrenderNowIndicator();
			this.isNowIndicatorRendered = false;
		}
	},


	// Returns a string unit, like 'second' or 'minute' that defined how often the current time indicator
	// should be refreshed. If something falsy is returned, no time indicator is rendered at all.
	getNowIndicatorUnit: function() {
		// subclasses should implement
	},


	// Renders a current time indicator at the given datetime
	renderNowIndicator: function(date) {
		// subclasses should implement
	},


	// Undoes the rendering actions from renderNowIndicator
	unrenderNowIndicator: function() {
		// subclasses should implement
	},


	/* Dimensions
	------------------------------------------------------------------------------------------------------------------*/


	// Refreshes anything dependant upon sizing of the container element of the grid
	updateSize: function(isResize) {
		var scroll;

		if (isResize) {
			scroll = this.queryScroll();
		}

		this.updateHeight(isResize);
		this.updateWidth(isResize);
		this.updateNowIndicator();

		if (isResize) {
			this.applyScroll(scroll);
		}
	},


	// Refreshes the horizontal dimensions of the calendar
	updateWidth: function(isResize) {
		// subclasses should implement
	},


	// Refreshes the vertical dimensions of the calendar
	updateHeight: function(isResize) {
		var calendar = this.calendar; // we poll the calendar for height information

		this.setHeight(
			calendar.getSuggestedViewHeight(),
			calendar.isHeightAuto()
		);
	},


	// Updates the vertical dimensions of the calendar to the specified height.
	// if `isAuto` is set to true, height becomes merely a suggestion and the view should use its "natural" height.
	setHeight: function(height, isAuto) {
		// subclasses should implement
	},


	/* Scroller
	------------------------------------------------------------------------------------------------------------------*/


	queryScroll: function() {
		var scroll = {};

		if (this.isDatesRendered) {
			$.extend(scroll, this.queryDateScroll());
		}

		return scroll;
	},


	applyScroll: function(scroll) {
		this.applyDateScroll(scroll);
	},


	computeInitialDateScroll: function() {
		return {}; // subclasses must implement
	},


	queryDateScroll: function() {
		return {}; // subclasses must implement
	},


	applyDateScroll: function(scroll) {
		; // subclasses must implement
	},


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


	freezeHeight: function() {
		this.calendar.freezeContentHeight();
	},


	thawHeight: function() {
		this.calendar.thawContentHeight();
	},


	// Event High-level Rendering
	// -----------------------------------------------------------------------------------------------------------------


	executeEventsRender: function(events) {
		var scroll;

		scroll = this.queryScroll();
		this.freezeHeight();

		this.executeEventsUnrender(true);

		this.renderEvents(events);

		this.thawHeight();
		this.applyScroll(scroll);

		this.isEventsRendered = true;
		this.onEventsRender();
	},


	executeEventsUnrender: function(willRender) {
		var scroll;

		if (this.isEventsRendered) {
			this.onBeforeEventsUnrender();

			if (!willRender) {
				scroll = this.queryScroll();
				this.freezeHeight();
			}

			if (this.destroyEvents) {
				this.destroyEvents(); // TODO: deprecate
			}

			this.unrenderEvents();

			if (!willRender) {
				this.thawHeight();
				this.applyScroll(scroll);
			}

			this.isEventsRendered = false;
		}
	},


	// Event Rendering Triggers
	// -----------------------------------------------------------------------------------------------------------------


	// Signals that all events have been rendered
	onEventsRender: function() {
		this.renderedEventSegEach(function(seg) {
			this.publiclyTrigger('eventAfterRender', seg.event, seg.event, seg.el);
		});
		this.publiclyTrigger('eventAfterAllRender');
	},


	// Signals that all event elements are about to be removed
	onBeforeEventsUnrender: function() {
		this.renderedEventSegEach(function(seg) {
			this.publiclyTrigger('eventDestroy', seg.event, seg.event, seg.el);
		});
	},


	// Event Low-level Rendering
	// -----------------------------------------------------------------------------------------------------------------


	// Renders the events onto the view.
	renderEvents: function(events) {
		// subclasses should implement
	},


	// Removes event elements from the view.
	unrenderEvents: function() {
		// subclasses should implement
	},


	// Event Rendering Utils
	// -----------------------------------------------------------------------------------------------------------------


	// Given an event and the default element used for rendering, returns the element that should actually be used.
	// Basically runs events and elements through the eventRender hook.
	resolveEventEl: function(event, el) {
		var custom = this.publiclyTrigger('eventRender', event, event, el);

		if (custom === false) { // means don't render at all
			el = null;
		}
		else if (custom && custom !== true) {
			el = $(custom);
		}

		return el;
	},


	// Hides all rendered event segments linked to the given event
	showEvent: function(event) {
		this.renderedEventSegEach(function(seg) {
			seg.el.css('visibility', '');
		}, event);
	},


	// Shows all rendered event segments linked to the given event
	hideEvent: function(event) {
		this.renderedEventSegEach(function(seg) {
			seg.el.css('visibility', 'hidden');
		}, event);
	},


	// Iterates through event segments that have been rendered (have an el). Goes through all by default.
	// If the optional `event` argument is specified, only iterates through segments linked to that event.
	// The `this` value of the callback function will be the view.
	renderedEventSegEach: function(func, event) {
		var segs = this.getEventSegs();
		var i;

		for (i = 0; i < segs.length; i++) {
			if (!event || segs[i].event._id === event._id) {
				if (segs[i].el) {
					func.call(this, segs[i]);
				}
			}
		}
	},


	// Retrieves all the rendered segment objects for the view
	getEventSegs: function() {
		// subclasses must implement
		return [];
	},


	/* Event Drag-n-Drop
	------------------------------------------------------------------------------------------------------------------*/


	// Computes if the given event is allowed to be dragged by the user
	isEventDraggable: function(event) {
		return this.isEventStartEditable(event);
	},


	isEventStartEditable: function(event) {
		return firstDefined(
			event.startEditable,
			(event.source || {}).startEditable,
			this.opt('eventStartEditable'),
			this.isEventGenerallyEditable(event)
		);
	},


	isEventGenerallyEditable: function(event) {
		return firstDefined(
			event.editable,
			(event.source || {}).editable,
			this.opt('editable')
		);
	},


	// Must be called when an event in the view is dropped onto new location.
	// `dropLocation` is an object that contains the new zoned start/end/allDay values for the event.
	reportSegDrop: function(seg, dropLocation, largeUnit, el, ev) {
		var calendar = this.calendar;
		var mutateResult = calendar.mutateSeg(seg, dropLocation, largeUnit);
		var undoFunc = function() {
			mutateResult.undo();
			calendar.reportEventChange();
		};

		this.triggerEventDrop(seg.event, mutateResult.dateDelta, undoFunc, el, ev);
		calendar.reportEventChange(); // will rerender events
	},


	// Triggers event-drop handlers that have subscribed via the API
	triggerEventDrop: function(event, dateDelta, undoFunc, el, ev) {
		this.publiclyTrigger('eventDrop', el[0], event, dateDelta, undoFunc, ev, {}); // {} = jqui dummy
	},


	/* External Element Drag-n-Drop
	------------------------------------------------------------------------------------------------------------------*/


	// Must be called when an external element, via jQuery UI, has been dropped onto the calendar.
	// `meta` is the parsed data that has been embedded into the dragging event.
	// `dropLocation` is an object that contains the new zoned start/end/allDay values for the event.
	reportExternalDrop: function(meta, dropLocation, el, ev, ui) {
		var eventProps = meta.eventProps;
		var eventInput;
		var event;

		// Try to build an event object and render it. TODO: decouple the two
		if (eventProps) {
			eventInput = $.extend({}, eventProps, dropLocation);
			event = this.calendar.renderEvent(eventInput, meta.stick)[0]; // renderEvent returns an array
		}

		this.triggerExternalDrop(event, dropLocation, el, ev, ui);
	},


	// Triggers external-drop handlers that have subscribed via the API
	triggerExternalDrop: function(event, dropLocation, el, ev, ui) {

		// trigger 'drop' regardless of whether element represents an event
		this.publiclyTrigger('drop', el[0], dropLocation.start, ev, ui);

		if (event) {
			this.publiclyTrigger('eventReceive', null, event); // signal an external event landed
		}
	},


	/* Drag-n-Drop Rendering (for both events and external elements)
	------------------------------------------------------------------------------------------------------------------*/


	// Renders a visual indication of a event or external-element drag over the given drop zone.
	// If an external-element, seg will be `null`.
	// Must return elements used for any mock events.
	renderDrag: function(dropLocation, seg) {
		// subclasses must implement
	},


	// Unrenders a visual indication of an event or external-element being dragged.
	unrenderDrag: function() {
		// subclasses must implement
	},


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


	// Computes if the given event is allowed to be resized from its starting edge
	isEventResizableFromStart: function(event) {
		return this.opt('eventResizableFromStart') && this.isEventResizable(event);
	},


	// Computes if the given event is allowed to be resized from its ending edge
	isEventResizableFromEnd: function(event) {
		return this.isEventResizable(event);
	},


	// Computes if the given event is allowed to be resized by the user at all
	isEventResizable: function(event) {
		var source = event.source || {};

		return firstDefined(
			event.durationEditable,
			source.durationEditable,
			this.opt('eventDurationEditable'),
			event.editable,
			source.editable,
			this.opt('editable')
		);
	},


	// Must be called when an event in the view has been resized to a new length
	reportSegResize: function(seg, resizeLocation, largeUnit, el, ev) {
		var calendar = this.calendar;
		var mutateResult = calendar.mutateSeg(seg, resizeLocation, largeUnit);
		var undoFunc = function() {
			mutateResult.undo();
			calendar.reportEventChange();
		};

		this.triggerEventResize(seg.event, mutateResult.durationDelta, undoFunc, el, ev);
		calendar.reportEventChange(); // will rerender events
	},


	// Triggers event-resize handlers that have subscribed via the API
	triggerEventResize: function(event, durationDelta, undoFunc, el, ev) {
		this.publiclyTrigger('eventResize', el[0], event, durationDelta, undoFunc, ev, {}); // {} = jqui dummy
	},


	/* Selection (time range)
	------------------------------------------------------------------------------------------------------------------*/


	// Selects a date span on the view. `start` and `end` are both Moments.
	// `ev` is the native mouse event that begin the interaction.
	select: function(span, ev) {
		this.unselect(ev);
		this.renderSelection(span);
		this.reportSelection(span, ev);
	},


	// Renders a visual indication of the selection
	renderSelection: function(span) {
		// subclasses should implement
	},


	// Called when a new selection is made. Updates internal state and triggers handlers.
	reportSelection: function(span, ev) {
		this.isSelected = true;
		this.triggerSelect(span, ev);
	},


	// Triggers handlers to 'select'
	triggerSelect: function(span, ev) {
		this.publiclyTrigger(
			'select',
			null,
			this.calendar.applyTimezone(span.start), // convert to calendar's tz for external API
			this.calendar.applyTimezone(span.end), // "
			ev
		);
	},


	// Undoes a selection. updates in the internal state and triggers handlers.
	// `ev` is the native mouse event that began the interaction.
	unselect: function(ev) {
		if (this.isSelected) {
			this.isSelected = false;
			if (this.destroySelection) {
				this.destroySelection(); // TODO: deprecate
			}
			this.unrenderSelection();
			this.publiclyTrigger('unselect', null, ev);
		}
	},


	// Unrenders a visual indication of selection
	unrenderSelection: function() {
		// subclasses should implement
	},


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


	selectEvent: function(event) {
		if (!this.selectedEvent || this.selectedEvent !== event) {
			this.unselectEvent();
			this.renderedEventSegEach(function(seg) {
				seg.el.addClass('fc-selected');
			}, event);
			this.selectedEvent = event;
		}
	},


	unselectEvent: function() {
		if (this.selectedEvent) {
			this.renderedEventSegEach(function(seg) {
				seg.el.removeClass('fc-selected');
			}, this.selectedEvent);
			this.selectedEvent = null;
		}
	},


	isEventSelected: function(event) {
		// event references might change on refetchEvents(), while selectedEvent doesn't,
		// so compare IDs
		return this.selectedEvent && this.selectedEvent._id === event._id;
	},


	/* Mouse / Touch Unselecting (time range & event unselection)
	------------------------------------------------------------------------------------------------------------------*/
	// TODO: move consistently to down/start or up/end?
	// TODO: don't kill previous selection if touch scrolling


	handleDocumentMousedown: function(ev) {
		if (isPrimaryMouseButton(ev)) {
			this.processUnselect(ev);
		}
	},


	processUnselect: function(ev) {
		this.processRangeUnselect(ev);
		this.processEventUnselect(ev);
	},


	processRangeUnselect: function(ev) {
		var ignore;

		// is there a time-range selection?
		if (this.isSelected && this.opt('unselectAuto')) {
			// only unselect if the clicked element is not identical to or inside of an 'unselectCancel' element
			ignore = this.opt('unselectCancel');
			if (!ignore || !$(ev.target).closest(ignore).length) {
				this.unselect(ev);
			}
		}
	},


	processEventUnselect: function(ev) {
		if (this.selectedEvent) {
			if (!$(ev.target).closest('.fc-selected').length) {
				this.unselectEvent();
			}
		}
	},


	/* Day Click
	------------------------------------------------------------------------------------------------------------------*/


	// Triggers handlers to 'dayClick'
	// Span has start/end of the clicked area. Only the start is useful.
	triggerDayClick: function(span, dayEl, ev) {
		this.publiclyTrigger(
			'dayClick',
			dayEl,
			this.calendar.applyTimezone(span.start), // convert to calendar's timezone for external API
			ev
		);
	},


	/* Date Utils
	------------------------------------------------------------------------------------------------------------------*/


	// 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;
	}

});


View.watch('initialEvents', [ 'dateProfile' ], function(deps) {
	return this.fetchInitialEvents(deps.dateProfile);
});


View.watch('bindingEvents', [ 'initialEvents' ], function(deps) {
	this.bindEventChanges();
	this.setEvents(deps.initialEvents);
}, function() {
	this.unbindEventChanges();
	this.unsetEvents();
});