fullcalendar.js

/*!
 * FullCalendar v2.2.0
 * Docs & License: http://arshaw.com/fullcalendar/
 * (c) 2013 Adam Shaw
 */


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

;;

var defaults = {

    lang: 'en',

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

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

    weekNumberTitle: 'W',
    weekNumberCalculation: 'local',

    //editable: false,

    // event ajax
    lazyFetching: true,
    startParam: 'start',
    endParam: 'end',
    timezoneParam: 'timezone',

    timezone: false,

    //allDayDefault: undefined,

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

    displayEventEnd: {
        month: false,
        basicWeek: false,
        'default': true
    },

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

    buttonIcons: {
        prev: 'left-single-arrow',
        next: 'right-single-arrow',
        prevYear: 'left-double-arrow',
        nextYear: 'right-double-arrow'
    },

    // jquery-ui theming
    theme: false,
    themeButtonIcons: {
        prev: 'circle-triangle-w',
        next: 'circle-triangle-e',
        prevYear: 'seek-prev',
        nextYear: 'seek-next'
    },

    dragOpacity: .75,
    dragRevertDuration: 500,
    dragScroll: true,

    //selectable: false,
    unselectAuto: true,

    dropAccept: '*',

    eventLimit: false,
    eventLimitText: 'more',
    eventLimitClick: 'popover',
    dayPopoverFormat: 'LL',

    handleWindowResize: true,
    windowResizeDelay: 200 // milliseconds before a rerender happens

};


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


function generateWeekColumnFormat(options, langData) {
    var format = langData.longDateFormat('L'); // for the format like "MM/DD/YYYY"
    format = format.replace(/^Y+[^\w\s]*|[^\w\s]*Y+$/g, ''); // strip the year off the edge, as well as other misc non-whitespace chars
    if (options.isRTL) {
        format += ' ddd'; // for RTL, add day-of-week to end
    }
    else {
        format = 'ddd ' + format; // for LTR, add day-of-week to beginning
    }
    return format;
}


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


// right-to-left defaults
var rtlDefaults = {
    header: {
        left: 'next,prev today',
        center: '',
        right: 'title'
    },
    buttonIcons: {
        prev: 'right-single-arrow',
        next: 'left-single-arrow',
        prevYear: 'right-double-arrow',
        nextYear: 'left-double-arrow'
    },
    themeButtonIcons: {
        prev: 'circle-triangle-e',
        next: 'circle-triangle-w',
        nextYear: 'seek-prev',
        prevYear: 'seek-next'
    }
};

;;

var fc = $.fullCalendar = { version: "2.2.0" };
var fcViews = fc.views = {};


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

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

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

    return res;
};


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


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

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

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

    return target;
}


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

;;

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


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

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

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

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

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

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

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


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

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

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

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

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


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



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

    instanceOptions = instanceOptions || {};

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

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

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

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



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

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



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


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


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

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



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


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


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

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

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

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

        return mom;
    };


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


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


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


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

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


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


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

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

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

        return end;
    };



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


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

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

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


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

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

        return formatDate(mom, formatStr);
    };



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


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



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


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



    // Main Rendering
    // -----------------------------------------------------------------------------------


    if (options.defaultDate != null) {
        date = t.moment(options.defaultDate);
    }
    else {
        date = t.getNow();
    }


    function render(inc) {
        if (!content) {
            initialRender();
        }
        else if (elementVisible()) {
            // mainly for the public API
            calcSize();
            renderView(inc);
        }
    }


    function initialRender() {
        tm = options.theme ? 'ui' : 'fc';
        element.addClass('fc');

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

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

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

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

        changeView(options.defaultView);

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


    function destroy() {

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

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

        $(window).unbind('resize', windowResizeProxy);
    }


    function elementVisible() {
        return element.is(':visible');
    }



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


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


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

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

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

        if (currentView) {

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

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

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

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

                    getAndRenderEvents();
                }
            }
        }

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



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


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


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


    function updateSize(shouldRecalc) {
        if (elementVisible()) {

            if (shouldRecalc) {
                _calcSize();
            }

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

            return true; // signal success
        }
    }


    function calcSize() {
        if (elementVisible()) {
            _calcSize();
        }
    }


    function _calcSize() { // assumes elementVisible
        if (typeof options.contentHeight === 'number') { // exists and not 'auto'
            suggestedViewHeight = options.contentHeight;
        }
        else if (typeof options.height === 'number') { // exists and not 'auto'
            suggestedViewHeight = options.height - (headerElement ? headerElement.outerHeight(true) : 0);
        }
        else {
            suggestedViewHeight = Math.round(content.width() / Math.max(options.aspectRatio, .5));
        }
    }


    function windowResize(ev) {
        if (
            !ignoreWindowResize &&
            ev.target === window && // so we don't process jqui "resize" events that have bubbled up
            currentView.start // view has already been rendered
        ) {
            if (updateSize(true)) {
                currentView.trigger('windowResize', _element);
            }
        }
    }



    /* Event Fetching/Rendering
    -----------------------------------------------------------------------------*/
    // TODO: going forward, most of this stuff should be directly handled by the view


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


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


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


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


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


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


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



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


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


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



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


    function select(start, end) {

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

        currentView.select(start, end);
    }


    function unselect() { // safe to be called before renderView
        if (currentView) {
            currentView.unselect();
        }
    }



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


    function prev() {
        renderView(-1);
    }


    function next() {
        renderView(1);
    }


    function prevYear() {
        date.add(-1, 'years');
        renderView();
    }


    function nextYear() {
        date.add(1, 'years');
        renderView();
    }


    function today() {
        date = t.getNow();
        renderView();
    }


    function gotoDate(dateInput) {
        date = t.moment(dateInput);
        renderView();
    }


    function incrementDate(delta) {
        date.add(moment.duration(delta));
        renderView();
    }


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

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

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

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

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

        date = newDate;
        changeView(viewName);
    }


    function getDate() {
        return date.clone();
    }



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


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


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



    /* Misc
    -----------------------------------------------------------------------------*/


    function getCalendar() {
        return t;
    }


    function getView() {
        return currentView;
    }


    function option(name, value) {
        if (value === undefined) {
            return options[name];
        }
        if (name == 'height' || name == 'contentHeight' || name == 'aspectRatio') {
            options[name] = value;
            updateSize(true); // true = allow recalculation of height
        }
    }


    function trigger(name, thisObj) {
        if (options[name]) {
            return options[name].apply(
                thisObj || _element,
                Array.prototype.slice.call(arguments, 2)
            );
        }
    }

}

;;

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

function Header(calendar, options) {
    var t = this;

    // exports
    t.render = render;
    t.destroy = destroy;
    t.updateTitle = updateTitle;
    t.activateButton = activateButton;
    t.deactivateButton = deactivateButton;
    t.disableButton = disableButton;
    t.enableButton = enableButton;
    t.getViewsWithButtons = getViewsWithButtons;

    // locals
    var el = $();
    var viewsWithButtons = [];
    var tm;


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

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

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

            return el;
        }
    }


    function destroy() {
        el.remove();
    }


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

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

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

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

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

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

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

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

                                        buttonClick();

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

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

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

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

        return sectionEl;
    }


    function updateTitle(text) {
        el.find('h2').text(text);
    }


    function activateButton(buttonName) {
        el.find('.fc-' + buttonName + '-button')
            .addClass(tm + '-state-active');
    }


    function deactivateButton(buttonName) {
        el.find('.fc-' + buttonName + '-button')
            .removeClass(tm + '-state-active');
    }


    function disableButton(buttonName) {
        el.find('.fc-' + buttonName + '-button')
            .attr('disabled', 'disabled')
            .addClass(tm + '-state-disabled');
    }


    function enableButton(buttonName) {
        el.find('.fc-' + buttonName + '-button')
            .removeAttr('disabled')
            .removeClass(tm + '-state-disabled');
    }


    function getViewsWithButtons() {
        return viewsWithButtons;
    }

}

;;

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

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

var eventGUID = 1;


function EventManager(options) { // assumed to be a calendar
    var t = this;


    // exports
    t.isFetchNeeded = isFetchNeeded;
    t.fetchEvents = fetchEvents;
    t.addEventSource = addEventSource;
    t.removeEventSource = removeEventSource;
    t.updateEvent = updateEvent;
    t.renderEvent = renderEvent;
    t.removeEvents = removeEvents;
    t.clientEvents = clientEvents;
    t.mutateEvent = mutateEvent;


    // imports
    var trigger = t.trigger;
    var getView = t.getView;
    var reportEvents = t.reportEvents;
    var getEventEnd = t.getEventEnd;


    // locals
    var stickySource = { events: [] };
    var sources = [ stickySource ];
    var rangeStart, rangeEnd;
    var currentFetchID = 0;
    var pendingSourceCnt = 0;
    var loadingLevel = 0;
    var cache = []; // holds events that have already been expanded


    $.each(
        (options.events ? [ options.events ] : []).concat(options.eventSources || []),
        function(i, sourceInput) {
            var source = buildEventSource(sourceInput);
            if (source) {
                sources.push(source);
            }
        }
    );



    /* Fetching
    -----------------------------------------------------------------------------*/


    function isFetchNeeded(start, end) {
        return !rangeStart || // nothing has been fetched yet?
            // or, a part of the new range is outside of the old range? (after normalizing)
            start.clone().stripZone() < rangeStart.clone().stripZone() ||
            end.clone().stripZone() > rangeEnd.clone().stripZone();
    }


    function fetchEvents(start, end) {
        rangeStart = start;
        rangeEnd = end;
        cache = [];
        var fetchID = ++currentFetchID;
        var len = sources.length;
        pendingSourceCnt = len;
        for (var i=0; i<len; i++) {
            fetchEventSource(sources[i], fetchID);
        }
    }


    function fetchEventSource(source, fetchID) {
        _fetchEventSource(source, function(eventInputs) {
            var isArraySource = $.isArray(source.events);
            var i, eventInput;
            var abstractEvent;

            if (fetchID == currentFetchID) {

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

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

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

                pendingSourceCnt--;
                if (!pendingSourceCnt) {
                    reportEvents(cache);
                }
            }
        });
    }


    function _fetchEventSource(source, callback) {
        var i;
        var fetchers = fc.sourceFetchers;
        var res;

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

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

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

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

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

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

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

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



    /* Sources
    -----------------------------------------------------------------------------*/


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


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

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

        if (source) {

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

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

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

            return source;
        }
    }


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


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


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



    /* Manipulation
    -----------------------------------------------------------------------------*/


    function updateEvent(event) {

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

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


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

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

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


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

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

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

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

            reportEvents(cache);

            return events;
        }

        return [];
    }


    function removeEvents(filter) {
        var eventID;
        var i;

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

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

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

        reportEvents(cache);
    }


    function clientEvents(filter) {
        if ($.isFunction(filter)) {
            return $.grep(cache, filter);
        }
        else if (filter != null) { // not null, not undefined. an event ID
            filter += '';
            return $.grep(cache, function(e) {
                return e._id == filter;
            });
        }
        return cache; // else, return all
    }



    /* Loading State
    -----------------------------------------------------------------------------*/


    function pushLoading() {
        if (!(loadingLevel++)) {
            trigger('loading', null, true, getView());
        }
    }


    function popLoading() {
        if (!(--loadingLevel)) {
            trigger('loading', null, false, getView());
        }
    }



    /* Event Normalization
    -----------------------------------------------------------------------------*/


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

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

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

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

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

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

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

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

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

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

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

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

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

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

        return out;
    }


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

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

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

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

        backupEventDates(event);
    }


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

        // hack for when fetchEvents hasn't been called yet (calculating businessHours for example)
        if (!_rangeStart || !_rangeEnd) {
            view = t.getView();
            _rangeStart = view.start;
            _rangeEnd = view.end;
        }

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

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

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

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

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

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

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

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

        return events;
    }



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


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

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

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

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

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

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

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

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

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


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

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

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

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

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

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

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

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

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

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


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

    t.getBusinessHoursEvents = getBusinessHoursEvents;


    // Returns an array of events as to when the business hours occur in the current 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 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));
        }

        return [];
    }


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

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


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

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


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


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

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

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


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

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

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

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

            if (!anyContainment) {
                return false;
            }
        }

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

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

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

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

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

        return true;
    }


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

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

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

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


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

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


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

        return start < eventEnd && end > eventStart;
    }

}


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

;;

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


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


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


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


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


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

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

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

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

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

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

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

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

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


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


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

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

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

    els.width(maxInnerWidth);

    return maxInnerWidth;
}


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

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

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


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


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


// borrowed from https://github.com/jquery/jquery-ui/blob/1.11.0/ui/core.js#L51
function getScrollParent(el) {
    var position = el.css('position'),
        scrollParent = el.parents().filter(function() {
            var parent = $(this);
            return (/(auto|scroll)/).test(
                parent.css('overflow') + parent.css('overflow-y') + parent.css('overflow-x')
            );
        }).eq(0);

    return position === 'fixed' || !scrollParent.length ? $(el[0].ownerDocument || document) : scrollParent;
}


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

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


// Returns a boolean whether this was a left mouse click and no ctrl key (which means right click on Mac)
function isPrimaryMouseButton(ev) {
    return ev.which == 1 && !ev.ctrlKey;
}


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


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

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

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

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

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


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


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

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


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


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


function dateCompare(a, b) { // works with Moments and native Dates
    return a - b;
}


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


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

fc.applyAll = applyAll; // export


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


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


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


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


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


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


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

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

;;

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


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

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

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

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

    return mom;
};

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

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

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

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

        if (parseAsUTC) {
            mom = moment.utc.apply(moment, args);
        }
        else {
            mom = moment.apply(null, args);
        }

        if (isAmbigTime) {
            mom._ambigTime = true;
            mom._ambigZone = true; // ambiguous time always means ambiguous zone
        }
        else if (parseZone) { // let's record the inputted zone somehow
            if (isAmbigZone) {
                mom._ambigZone = true;
            }
            else if (isSingleString) {
                mom.zone(input); // if not a valid zone, will assign UTC
            }
        }
    }

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

    return mom;
}


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

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

    return mom;
};


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

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

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

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

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

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

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

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

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

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

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

    return this; // for chaining
};

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


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

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

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

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

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

    return this; // for chaining
};

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

// this method implicitly marks a zone (will get called upon .utc() and .local())
newMomentProto.zone = function(tzo) {

    if (tzo != null) { // setter
        // these assignments needs to happen before the original zone method is called.
        // I forget why, something to do with a browser crash.
        this._ambigTime = false;
        this._ambigZone = false;
    }

    return oldMomentProto.zone.apply(this, arguments);
};

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

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

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

    return this; // for chaining
};


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

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

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


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

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

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

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

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

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

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

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


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

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

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

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

    return outputs;
}

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

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


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

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

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

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

;;

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


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


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


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

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

    return s;
}


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


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

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

    return '';
}


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

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

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

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

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

    separator = separator || ' - ';

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


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

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

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

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

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

    return leftStr + middleStr + rightStr;
}


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


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

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

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


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


var formatStringChunkCache = {};


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


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

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

    return chunks;
}

;;

/* A rectangular panel that is absolutely positioned over other content
------------------------------------------------------------------------------------------------------------------------
Options:
    - className (string)
    - content (HTML string or jQuery element set)
    - parentEl
    - top
    - left
    - right (the x coord of where the right edge should be. not a "CSS" right)
    - autoHide (boolean)
    - show (callback)
    - hide (callback)
*/

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


Popover.prototype = {

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


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


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


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

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

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

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


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


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

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

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


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

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

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

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

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

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


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

};

;;

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

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

*/

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

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


GridCoordMap.prototype = {

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

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


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


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

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

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

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

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

        return cell;
    },


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

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


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

};


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

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


ComboCoordMap.prototype = {

    coordMaps: null, // an array of CoordMaps


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

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


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

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

        return cell;
    }

};

;;

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

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


DragListener.prototype = {

    coordMap: null,
    options: null,

    isListening: false,
    isDragging: false,

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

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

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

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

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

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


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

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

            this.startListening(ev);

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


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

        if (!this.isListening) {

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

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

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

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

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

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

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


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


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

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

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


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

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

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

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


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

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

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

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


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


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


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


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


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

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

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

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

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

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


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


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


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


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


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

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


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

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

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

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

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

        this.setScrollVel(topVel, leftVel);
    },


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

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

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

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


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

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

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


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

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

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

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


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

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


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

};


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

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

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

    return false;
}

;;

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

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


MouseFollower.prototype = {

    options: null,

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

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

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

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

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

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


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

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

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

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


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

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

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

            if (callback) {
                callback();
            }
        }

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

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

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


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

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

        return el;
    },


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


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

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

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

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


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

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


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


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

};

;;

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

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


RowRenderer.prototype = {

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


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

        row = row || 0;

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

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

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


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

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


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

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

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

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

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

};

;;

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

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


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

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


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


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


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


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


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


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


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


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


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

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

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


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

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

                    dayEl = _this.getCellDayEl(cell);

                    dates = [ date, dragListener.origDate ].sort(dateCompare);
                    start = dates[0];
                    end = dates[1].clone().add(_this.cellDuration);

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

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


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


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


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


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


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


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


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


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

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

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

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

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

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


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


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


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


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


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


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


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


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


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


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


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


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

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


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

        if (segs.length) {

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

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

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

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

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

        return renderedSegs;
    },


    fillSegTag: 'div', // subclasses can override


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

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


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


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


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

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


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

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

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


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

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

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

        return classes;
    }

});

;;

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

$.extend(Grid.prototype, {

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


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

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

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

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

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


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

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

        this.segs = null;
    },


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


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


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


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


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

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

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

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

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

        return renderedSegs;
    },


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


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


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


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


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


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

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


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

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

        return '';
    },


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


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


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

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

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


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


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

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


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


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

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

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

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

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

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

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

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


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

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

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

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


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


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

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

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

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

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

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


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


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

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

        return classes;
    },


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


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


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

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

        return segs;
    },


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

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

        return ranges;
    },


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

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

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

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

        return ranges;
    },


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

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

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

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

            start = normalRange.end;
        }

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

        return inverseRanges;
    },


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

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

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

        return segs;
    }

});


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


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


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


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


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

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

    return eventsById;
}


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


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


;;

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

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


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

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

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


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

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

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

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

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


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


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

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

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


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


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


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

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

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


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


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


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


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


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

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

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

            this.renderRangeHelper(start, end, seg);

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

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


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


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


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


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


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


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

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

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

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

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

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

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


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


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


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


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

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

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

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

        return segs;
    },


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

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

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

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

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

        this.bookendCells(trEl, type);

        return skeletonEl;
    }

});

;;

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

$.extend(DayGrid.prototype, {

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


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


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


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

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

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


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

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

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

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

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


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

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

        this.rowStructs = null;
    },


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

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

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

        return rowStructs;
    },


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

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

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

        titleHtml =
            '<span class="fc-title">' +
                (htmlEscape(event.title || '') || '&nbsp;') + // we always want one line of height
            '</span>';

        return '<a class="' + classes.join(' ') + '"' +
                (event.url ?
                    ' href="' + htmlEscape(event.url) + '"' :
                    ''
                    ) +
                (skinCss ?
                    ' style="' + skinCss + '"' :
                    ''
                    ) +
            '>' +
                '<div class="fc-content">' +
                    (isRTL ?
                        titleHtml + ' ' + timeHtml : // put a natural space in between
                        timeHtml + ' ' + titleHtml   //
                        ) +
                '</div>' +
                (isResizable ?
                    '<div class="fc-resizer"/>' :
                    ''
                    ) +
            '</a>';
    },


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

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

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

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

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

                    emptyCellsUntil(seg.leftCol);

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

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

                    tr.append(td);
                }
            }

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

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


    // Stacks a flat array of segments, which are all assumed to be in the same row, into subarrays of vertical levels.
    buildSegLevels: function(segs) {
        var levels = [];
        var i, seg;
        var j;

        // Give preference to elements with certain criteria, so they have
        // a chance to be closer to the top.
        segs.sort(compareSegs);

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

            // loop through levels, starting with the topmost, until the segment doesn't collide with other segments
            for (j = 0; j < levels.length; j++) {
                if (!isDaySegCollision(seg, levels[j])) {
                    break;
                }
            }
            // `j` now holds the desired subrow index
            seg.level = j;

            // create new level array if needed and append segment
            (levels[j] || (levels[j] = [])).push(seg);
        }

        // order segments left-to-right. very important if calendar is RTL
        for (j = 0; j < levels.length; j++) {
            levels[j].sort(compareDaySegCols);
        }

        return levels;
    },


    // Given a flat array of segments, return an array of sub-arrays, grouped by each segment's row
    groupSegRows: function(segs) {
        var view = this.view;
        var segRows = [];
        var i;

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

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

        return segRows;
    }

});


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

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

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

    return false;
}


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

;;

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

$.extend(DayGrid.prototype, {


    segPopover: null, // the Popover that holds events that can't fit in a cell. null when not visible
    popoverSegs: null, // an array of segment objects that the segPopover holds. null when not visible


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


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

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

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

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


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

        // Reveal one level <tr> at a time and stop when we find one out of bounds
        for (i = 0; i < trEls.length; i++) {
            trEl = trEls.eq(i).removeClass('fc-limited'); // get and reveal
            if (trEl.position().top + trEl.outerHeight() > rowHeight) {
                return i;
            }
        }

        return false; // should not limit at all
    },


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

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

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

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

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

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

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

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

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

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


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

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

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


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

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

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

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

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


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

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

        options = {
            className: 'fc-more-popover',
            content: this.renderSegPopoverContent(date, segs),
            parentEl: this.el,
            top: topEl.offset().top,
            autoHide: true, // when the user clicks elsewhere, hide the popover
            viewportConstrain: view.opt('popoverViewportConstrain'),
            hide: function() {
                // destroy everything when the popover is hidden
                _this.segPopover.destroy();
                _this.segPopover = null;
                _this.popoverSegs = null;
            }
        };

        // Determine horizontal coordinate.
        // We use the moreWrap instead of the <td> to avoid border confusion.
        if (view.opt('isRTL')) {
            options.right = moreWrap.offset().left + moreWrap.outerWidth() + 1; // +1 to be over cell border
        }
        else {
            options.left = moreWrap.offset().left - 1; // -1 to be over cell border
        }

        this.segPopover = new Popover(options);
        this.segPopover.show();
    },


    // Builds the inner DOM contents of the segment popover
    renderSegPopoverContent: function(date, segs) {
        var view = this.view;
        var isTheme = view.opt('theme');
        var title = date.format(view.opt('dayPopoverFormat'));
        var content = $(
            '<div class="fc-header ' + view.widgetHeaderClass + '">' +
                '<span class="fc-close ' +
                    (isTheme ? 'ui-icon ui-icon-closethick' : 'fc-icon fc-icon-x') +
                '"></span>' +
                '<span class="fc-title">' +
                    htmlEscape(title) +
                '</span>' +
                '<div class="fc-clear"/>' +
            '</div>' +
            '<div class="fc-body ' + view.widgetContentClass + '">' +
                '<div class="fc-event-container"></div>' +
            '</div>'
        );
        var segContainer = content.find('.fc-event-container');
        var i;

        // render each seg's `el` and only return the visible segs
        segs = this.renderFgSegEls(segs, true); // disableResizing=true
        this.popoverSegs = segs;

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

            // because segments in the popover are not part of a grid coordinate system, provide a hint to any
            // grids that want to do drag-n-drop about which cell it came from
            segs[i].cellDate = date;

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

        return content;
    },


    // Given the events within an array of segment objects, reslice them to be in a single day
    resliceDaySegs: function(segs, dayDate) {

        // build an array of the original events
        var events = $.map(segs, function(seg) {
            return seg.event;
        });

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

        // slice the events with a custom slicing function
        return this.eventsToSegs(
            events,
            function(rangeStart, rangeEnd) {
                var seg = intersectionToSeg(rangeStart, rangeEnd, dayStart, dayEnd); // if no intersection, undefined
                return seg ? [ seg ] : []; // must return an array of segments
            }
        );
    },


    // Generates the text that should be inside a "more" link, given the number of events it represents
    getMoreLinkText: function(num) {
        var view = this.view;
        var opt = view.opt('eventLimitText');

        if (typeof opt === 'function') {
            return opt(num);
        }
        else {
            return '+' + num + ' ' + opt;
        }
    },


    // Returns segments within a given cell.
    // If `startLevel` is specified, returns only events including and below that level. Otherwise returns all segs.
    getCellSegs: function(cell, startLevel) {
        var segMatrix = this.rowStructs[cell.row].segMatrix;
        var level = startLevel || 0;
        var segs = [];
        var seg;

        while (level < segMatrix.length) {
            seg = segMatrix[level][cell.col];
            if (seg) {
                segs.push(seg);
            }
            level++;
        }

        return segs;
    }

});

;;

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

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


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

    slotDuration: null, // duration of a "slot", a distinct time segment on given day, visualized by lines
    snapDuration: null, // granularity of time for dragging and selecting

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

    dayEls: null, // cells elements in the day-row background
    slatEls: null, // elements running horizontally across all columns

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

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

    businessHourSegs: null,


    // Renders the time grid into `this.el`, which should already be assigned.
    // Relies on the view's colCnt. In the future, this component should probably be self-sufficient.
    render: function() {
        this.processOptions();

        this.el.html(this.renderHtml());

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

        this.computeSlatTops();

        this.renderBusinessHours();

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


    renderBusinessHours: function() {
        var events = this.view.calendar.getBusinessHoursEvents();
        this.businessHourSegs = this.renderFill('businessHours', this.eventsToSegs(events), 'bgevent');
    },


    // Renders the basic HTML skeleton for the grid
    renderHtml: function() {
        return '' +
            '<div class="fc-bg">' +
                '<table>' +
                    this.rowHtml('slotBg') + // leverages RowRenderer, which will call slotBgCellHtml
                '</table>' +
            '</div>' +
            '<div class="fc-slats">' +
                '<table>' +
                    this.slatRowHtml() +
                '</table>' +
            '</div>';
    },


    // Renders the HTML for a vertical background cell behind the slots.
    // This method is distinct from 'bg' because we wanted a new `rowType` so the View could customize the rendering.
    slotBgCellHtml: function(row, col, date) {
        return this.bgCellHtml(row, col, date);
    },


    // Generates the HTML for the horizontal "slats" that run width-wise. Has a time axis on a side. Depends on RTL.
    slatRowHtml: function() {
        var view = this.view;
        var calendar = view.calendar;
        var isRTL = view.opt('isRTL');
        var html = '';
        var slotNormal = this.slotDuration.asMinutes() % 15 === 0;
        var slotTime = moment.duration(+this.minTime); // wish there was .clone() for durations
        var slotDate; // will be on the view's first day, but we only care about its time
        var minutes;
        var axisHtml;

        // Calculate the time for each slot
        while (slotTime < this.maxTime) {
            slotDate = view.start.clone().time(slotTime); // will be in UTC but that's good. to avoid DST issues
            minutes = slotDate.minutes();

            axisHtml =
                '<td class="fc-axis fc-time ' + view.widgetContentClass + '" ' + view.axisStyleAttr() + '>' +
                    ((!slotNormal || !minutes) ? // if irregular slot duration, or on the hour, then display the time
                        '<span>' + // for matchCellWidths
                            htmlEscape(calendar.formatDate(slotDate, view.opt('axisFormat'))) +
                        '</span>' :
                        ''
                        ) +
                '</td>';

            html +=
                '<tr ' + (!minutes ? '' : 'class="fc-minor"') + '>' +
                    (!isRTL ? axisHtml : '') +
                    '<td class="' + view.widgetContentClass + '"/>' +
                    (isRTL ? axisHtml : '') +
                "</tr>";

            slotTime.add(this.slotDuration);
        }

        return html;
    },


    // Parses various options into properties of this object
    processOptions: function() {
        var view = this.view;
        var slotDuration = view.opt('slotDuration');
        var snapDuration = view.opt('snapDuration');

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

        this.slotDuration = slotDuration;
        this.snapDuration = snapDuration;
        this.cellDuration = snapDuration; // important to assign this for Grid.events.js

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


    // Slices up a date range into a segment for each column
    rangeToSegs: function(rangeStart, rangeEnd) {
        var view = this.view;
        var segs = [];
        var seg;
        var col;
        var cellDate;
        var colStart, colEnd;

        // normalize
        rangeStart = rangeStart.clone().stripZone();
        rangeEnd = rangeEnd.clone().stripZone();

        for (col = 0; col < view.colCnt; col++) {
            cellDate = view.cellToDate(0, col); // use the View's cell system for this
            colStart = cellDate.clone().time(this.minTime);
            colEnd = cellDate.clone().time(this.maxTime);
            seg = intersectionToSeg(rangeStart, rangeEnd, colStart, colEnd);
            if (seg) {
                seg.col = col;
                segs.push(seg);
            }
        }

        return segs;
    },


    /* Coordinates
    ------------------------------------------------------------------------------------------------------------------*/


    // Called when there is a window resize/zoom and we need to recalculate coordinates for the grid
    resize: function() {
        this.computeSlatTops();
        this.updateSegVerticals();
    },


    // Populates the given empty `rows` and `cols` arrays with offset positions of the "snap" cells.
    // "Snap" cells are different the slots because they might have finer granularity.
    buildCoords: function(rows, cols) {
        var colCnt = this.view.colCnt;
        var originTop = this.el.offset().top;
        var snapTime = moment.duration(+this.minTime);
        var p = null;
        var e, n;

        this.dayEls.slice(0, colCnt).each(function(i, _e) {
            e = $(_e);
            n = e.offset().left;
            if (p) {
                p[1] = n;
            }
            p = [ n ];
            cols[i] = p;
        });
        p[1] = n + e.outerWidth();

        p = null;
        while (snapTime < this.maxTime) {
            n = originTop + this.computeTimeTop(snapTime);
            if (p) {
                p[1] = n;
            }
            p = [ n ];
            rows.push(p);
            snapTime.add(this.snapDuration);
        }
        p[1] = originTop + this.computeTimeTop(snapTime); // the position of the exclusive end
    },


    // Gets the datetime for the given slot cell
    getCellDate: function(cell) {
        var view = this.view;
        var calendar = view.calendar;

        return calendar.rezoneDate( // since we are adding a time, it needs to be in the calendar's timezone
            view.cellToDate(0, cell.col) // View's coord system only accounts for start-of-day for column
                .time(this.minTime + this.snapDuration * cell.row)
        );
    },


    // Gets the element that represents the whole-day the cell resides on
    getCellDayEl: function(cell) {
        return this.dayEls.eq(cell.col);
    },


    // Computes the top coordinate, relative to the bounds of the grid, of the given date.
    // A `startOfDayDate` must be given for avoiding ambiguity over how to treat midnight.
    computeDateTop: function(date, startOfDayDate) {
        return this.computeTimeTop(
            moment.duration(
                date.clone().stripZone() - startOfDayDate.clone().stripTime()
            )
        );
    },


    // Computes the top coordinate, relative to the bounds of the grid, of the given time (a Duration).
    computeTimeTop: function(time) {
        var slatCoverage = (time - this.minTime) / this.slotDuration; // floating-point value of # of slots covered
        var slatIndex;
        var slatRemainder;
        var slatTop;
        var slatBottom;

        // constrain. because minTime/maxTime might be customized
        slatCoverage = Math.max(0, slatCoverage);
        slatCoverage = Math.min(this.slatEls.length, slatCoverage);

        slatIndex = Math.floor(slatCoverage); // an integer index of the furthest whole slot
        slatRemainder = slatCoverage - slatIndex;
        slatTop = this.slatTops[slatIndex]; // the top position of the furthest whole slot

        if (slatRemainder) { // time spans part-way into the slot
            slatBottom = this.slatTops[slatIndex + 1];
            return slatTop + (slatBottom - slatTop) * slatRemainder; // part-way between slots
        }
        else {
            return slatTop;
        }
    },


    // Queries each `slatEl` for its position relative to the grid's container and stores it in `slatTops`.
    // Includes the the bottom of the last slat as the last item in the array.
    computeSlatTops: function() {
        var tops = [];
        var top;

        this.slatEls.each(function(i, node) {
            top = $(node).position().top;
            tops.push(top);
        });

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

        this.slatTops = tops;
    },


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


    // Renders a visual indication of an event being dragged over the specified date(s).
    // `end` and `seg` can be null. See View's documentation on renderDrag for more info.
    renderDrag: function(start, end, seg) {
        var opacity;

        if (seg) { // if there is event information for this drag, render a helper event
            this.renderRangeHelper(start, end, seg);

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

            return true; // signal that a helper has been rendered
        }
        else {
            // otherwise, just render a highlight
            this.renderHighlight(
                start,
                end || this.view.calendar.getDefaultEventEnd(false, start)
            );
        }
    },


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


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


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


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


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


    // Renders a mock "helper" event. `sourceSeg` is the original segment object and might be null (an external drag)
    renderHelper: function(event, sourceSeg) {
        var segs = this.eventsToSegs([ event ]);
        var tableEl;
        var i, seg;
        var sourceEl;

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

        // Try to make the segment that is in the same row as sourceSeg look the same
        for (i = 0; i < segs.length; i++) {
            seg = segs[i];
            if (sourceSeg && sourceSeg.col === seg.col) {
                sourceEl = sourceSeg.el;
                seg.el.css({
                    left: sourceEl.css('left'),
                    right: sourceEl.css('right'),
                    'margin-left': sourceEl.css('margin-left'),
                    'margin-right': sourceEl.css('margin-right')
                });
            }
        }

        this.helperEl = $('<div class="fc-helper-skeleton"/>')
            .append(tableEl)
                .appendTo(this.el);
    },


    // Unrenders any mock helper event
    destroyHelper: function() {
        if (this.helperEl) {
            this.helperEl.remove();
            this.helperEl = null;
        }
    },


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


    // Renders a visual indication of a selection. Overrides the default, which was to simply render a highlight.
    renderSelection: function(start, end) {
        if (this.view.opt('selectHelper')) { // this setting signals that a mock helper event should be rendered
            this.renderRangeHelper(start, end);
        }
        else {
            this.renderHighlight(start, end);
        }
    },


    // Unrenders any visual indication of a selection
    destroySelection: function() {
        this.destroyHelper();
        this.destroyHighlight();
    },


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


    // Renders a set of rectangles over the given time segments.
    // Only returns segments that successfully rendered.
    renderFill: function(type, segs, className) {
        var view = this.view;
        var segCols;
        var skeletonEl;
        var trEl;
        var col, colSegs;
        var tdEl;
        var containerEl;
        var dayDate;
        var i, seg;

        if (segs.length) {

            segs = this.renderFillSegEls(type, segs); // assignes `.el` to each seg. returns successfully rendered segs
            segCols = this.groupSegCols(segs); // group into sub-arrays, and assigns 'col' to each seg

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

            for (col = 0; col < segCols.length; col++) {
                colSegs = segCols[col];
                tdEl = $('<td/>').appendTo(trEl);

                if (colSegs.length) {
                    containerEl = $('<div class="fc-' + className + '-container"/>').appendTo(tdEl);
                    dayDate = view.cellToDate(0, col);

                    for (i = 0; i < colSegs.length; i++) {
                        seg = colSegs[i];
                        containerEl.append(
                            seg.el.css({
                                top: this.computeDateTop(seg.start, dayDate),
                                bottom: -this.computeDateTop(seg.end, dayDate) // the y position of the bottom edge
                            })
                        );
                    }
                }
            }

            this.bookendCells(trEl, type);

            this.el.append(skeletonEl);
            this.elsByFill[type] = skeletonEl;
        }

        return segs;
    }

});

;;

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

$.extend(TimeGrid.prototype, {

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


    // Renders the given foreground event segments onto the grid
    renderFgSegs: function(segs) {
        segs = this.renderFgSegEls(segs); // returns a subset of the segs. segs that were actually rendered

        this.el.append(
            this.eventSkeletonEl = $('<div class="fc-content-skeleton"/>')
                .append(this.renderSegTable(segs))
        );

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


    // Unrenders all currently rendered foreground event segments
    destroyFgSegs: function(segs) {
        if (this.eventSkeletonEl) {
            this.eventSkeletonEl.remove();
            this.eventSkeletonEl = null;
        }
    },


    // Renders and returns the <table> portion of the event-skeleton.
    // Returns an object with properties 'tbodyEl' and 'segs'.
    renderSegTable: function(segs) {
        var tableEl = $('<table><tr/></table>');
        var trEl = tableEl.find('tr');
        var segCols;
        var i, seg;
        var col, colSegs;
        var containerEl;

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

        this.computeSegVerticals(segs); // compute and assign top/bottom

        for (col = 0; col < segCols.length; col++) { // iterate each column grouping
            colSegs = segCols[col];
            placeSlotSegs(colSegs); // compute horizontal coordinates, z-index's, and reorder the array

            containerEl = $('<div class="fc-event-container"/>');

            // assign positioning CSS and insert into container
            for (i = 0; i < colSegs.length; i++) {
                seg = colSegs[i];
                seg.el.css(this.generateSegPositionCss(seg));

                // if the height is short, add a className for alternate styling
                if (seg.bottom - seg.top < 30) {
                    seg.el.addClass('fc-short');
                }

                containerEl.append(seg.el);
            }

            trEl.append($('<td/>').append(containerEl));
        }

        this.bookendCells(trEl, 'eventSkeleton');

        return tableEl;
    },


    // Refreshes the CSS top/bottom coordinates for each segment element. Probably after a window resize/zoom.
    // Repositions business hours segs too, so not just for events. Maybe shouldn't be here.
    updateSegVerticals: function() {
        var allSegs = (this.segs || []).concat(this.businessHourSegs || []);
        var i;

        this.computeSegVerticals(allSegs);

        for (i = 0; i < allSegs.length; i++) {
            allSegs[i].el.css(
                this.generateSegVerticalCss(allSegs[i])
            );
        }
    },


    // For each segment in an array, computes and assigns its top and bottom properties
    computeSegVerticals: function(segs) {
        var i, seg;

        for (i = 0; i < segs.length; i++) {
            seg = segs[i];
            seg.top = this.computeDateTop(seg.start, seg.start);
            seg.bottom = this.computeDateTop(seg.end, seg.start);
        }
    },


    // Renders the HTML for a single event segment's default rendering
    fgSegHtml: function(seg, disableResizing) {
        var view = this.view;
        var event = seg.event;
        var isDraggable = view.isEventDraggable(event);
        var isResizable = !disableResizing && seg.isEnd && view.isEventResizable(event);
        var classes = this.getSegClasses(seg, isDraggable, isResizable);
        var skinCss = this.getEventSkinCss(event);
        var timeText;
        var fullTimeText; // more verbose time text. for the print stylesheet
        var startTimeText; // just the start time text

        classes.unshift('fc-time-grid-event');

        if (view.isMultiDayEvent(event)) { // if the event appears to span more than one day...
            // Don't display time text on segments that run entirely through a day.
            // That would appear as midnight-midnight and would look dumb.
            // Otherwise, display the time text for the *segment's* times (like 6pm-midnight or midnight-10am)
            if (seg.isStart || seg.isEnd) {
                timeText = view.getEventTimeText(seg.start, seg.end);
                fullTimeText = view.getEventTimeText(seg.start, seg.end, 'LT');
                startTimeText = view.getEventTimeText(seg.start, null);
            }
        } else {
            // Display the normal time text for the *event's* times
            timeText = view.getEventTimeText(event);
            fullTimeText = view.getEventTimeText(event, 'LT');
            startTimeText = view.getEventTimeText(event.start, null);
        }

        return '<a class="' + classes.join(' ') + '"' +
            (event.url ?
                ' href="' + htmlEscape(event.url) + '"' :
                ''
                ) +
            (skinCss ?
                ' style="' + skinCss + '"' :
                ''
                ) +
            '>' +
                '<div class="fc-content">' +
                    (timeText ?
                        '<div class="fc-time"' +
                        ' data-start="' + htmlEscape(startTimeText) + '"' +
                        ' data-full="' + htmlEscape(fullTimeText) + '"' +
                        '>' +
                            '<span>' + htmlEscape(timeText) + '</span>' +
                        '</div>' :
                        ''
                        ) +
                    (event.title ?
                        '<div class="fc-title">' +
                            htmlEscape(event.title) +
                        '</div>' :
                        ''
                        ) +
                '</div>' +
                '<div class="fc-bg"/>' +
                (isResizable ?
                    '<div class="fc-resizer"/>' :
                    ''
                    ) +
            '</a>';
    },


    // Generates an object with CSS properties/values that should be applied to an event segment element.
    // Contains important positioning-related properties that should be applied to any event element, customized or not.
    generateSegPositionCss: function(seg) {
        var view = this.view;
        var isRTL = view.opt('isRTL');
        var shouldOverlap = view.opt('slotEventOverlap');
        var backwardCoord = seg.backwardCoord; // the left side if LTR. the right side if RTL. floating-point
        var forwardCoord = seg.forwardCoord; // the right side if LTR. the left side if RTL. floating-point
        var props = this.generateSegVerticalCss(seg); // get top/bottom first
        var left; // amount of space from left edge, a fraction of the total width
        var right; // amount of space from right edge, a fraction of the total width

        if (shouldOverlap) {
            // double the width, but don't go beyond the maximum forward coordinate (1.0)
            forwardCoord = Math.min(1, backwardCoord + (forwardCoord - backwardCoord) * 2);
        }

        if (isRTL) {
            left = 1 - forwardCoord;
            right = backwardCoord;
        }
        else {
            left = backwardCoord;
            right = 1 - forwardCoord;
        }

        props.zIndex = seg.level + 1; // convert from 0-base to 1-based
        props.left = left * 100 + '%';
        props.right = right * 100 + '%';

        if (shouldOverlap && seg.forwardPressure) {
            // add padding to the edge so that forward stacked events don't cover the resizer's icon
            props[isRTL ? 'marginLeft' : 'marginRight'] = 10 * 2; // 10 is a guesstimate of the icon's width
        }

        return props;
    },


    // Generates an object with CSS properties for the top/bottom coordinates of a segment element
    generateSegVerticalCss: function(seg) {
        return {
            top: seg.top,
            bottom: -seg.bottom // flipped because needs to be space beyond bottom edge of event container
        };
    },


    // Given a flat array of segments, return an array of sub-arrays, grouped by each segment's col
    groupSegCols: function(segs) {
        var view = this.view;
        var segCols = [];
        var i;

        for (i = 0; i < view.colCnt; i++) {
            segCols.push([]);
        }

        for (i = 0; i < segs.length; i++) {
            segCols[segs[i].col].push(segs[i]);
        }

        return segCols;
    }

});


// Given an array of segments that are all in the same column, sets the backwardCoord and forwardCoord on each.
// Also reorders the given array by date!
function placeSlotSegs(segs) {
    var levels;
    var level0;
    var i;

    segs.sort(compareSegs); // order by date
    levels = buildSlotSegLevels(segs);
    computeForwardSlotSegs(levels);

    if ((level0 = levels[0])) {

        for (i = 0; i < level0.length; i++) {
            computeSlotSegPressures(level0[i]);
        }

        for (i = 0; i < level0.length; i++) {
            computeSlotSegCoords(level0[i], 0, 0);
        }
    }
}


// Builds an array of segments "levels". The first level will be the leftmost tier of segments if the calendar is
// left-to-right, or the rightmost if the calendar is right-to-left. Assumes the segments are already ordered by date.
function buildSlotSegLevels(segs) {
    var levels = [];
    var i, seg;
    var j;

    for (i=0; i<segs.length; i++) {
        seg = segs[i];

        // go through all the levels and stop on the first level where there are no collisions
        for (j=0; j<levels.length; j++) {
            if (!computeSlotSegCollisions(seg, levels[j]).length) {
                break;
            }
        }

        seg.level = j;

        (levels[j] || (levels[j] = [])).push(seg);
    }

    return levels;
}


// For every segment, figure out the other segments that are in subsequent
// levels that also occupy the same vertical space. Accumulate in seg.forwardSegs
function computeForwardSlotSegs(levels) {
    var i, level;
    var j, seg;
    var k;

    for (i=0; i<levels.length; i++) {
        level = levels[i];

        for (j=0; j<level.length; j++) {
            seg = level[j];

            seg.forwardSegs = [];
            for (k=i+1; k<levels.length; k++) {
                computeSlotSegCollisions(seg, levels[k], seg.forwardSegs);
            }
        }
    }
}


// Figure out which path forward (via seg.forwardSegs) results in the longest path until
// the furthest edge is reached. The number of segments in this path will be seg.forwardPressure
function computeSlotSegPressures(seg) {
    var forwardSegs = seg.forwardSegs;
    var forwardPressure = 0;
    var i, forwardSeg;

    if (seg.forwardPressure === undefined) { // not already computed

        for (i=0; i<forwardSegs.length; i++) {
            forwardSeg = forwardSegs[i];

            // figure out the child's maximum forward path
            computeSlotSegPressures(forwardSeg);

            // either use the existing maximum, or use the child's forward pressure
            // plus one (for the forwardSeg itself)
            forwardPressure = Math.max(
                forwardPressure,
                1 + forwardSeg.forwardPressure
            );
        }

        seg.forwardPressure = forwardPressure;
    }
}


// Calculate seg.forwardCoord and seg.backwardCoord for the segment, where both values range
// from 0 to 1. If the calendar is left-to-right, the seg.backwardCoord maps to "left" and
// seg.forwardCoord maps to "right" (via percentage). Vice-versa if the calendar is right-to-left.
//
// The segment might be part of a "series", which means consecutive segments with the same pressure
// who's width is unknown until an edge has been hit. `seriesBackwardPressure` is the number of
// segments behind this one in the current series, and `seriesBackwardCoord` is the starting
// coordinate of the first segment in the series.
function computeSlotSegCoords(seg, seriesBackwardPressure, seriesBackwardCoord) {
    var forwardSegs = seg.forwardSegs;
    var i;

    if (seg.forwardCoord === undefined) { // not already computed

        if (!forwardSegs.length) {

            // if there are no forward segments, this segment should butt up against the edge
            seg.forwardCoord = 1;
        }
        else {

            // sort highest pressure first
            forwardSegs.sort(compareForwardSlotSegs);

            // this segment's forwardCoord will be calculated from the backwardCoord of the
            // highest-pressure forward segment.
            computeSlotSegCoords(forwardSegs[0], seriesBackwardPressure + 1, seriesBackwardCoord);
            seg.forwardCoord = forwardSegs[0].backwardCoord;
        }

        // calculate the backwardCoord from the forwardCoord. consider the series
        seg.backwardCoord = seg.forwardCoord -
            (seg.forwardCoord - seriesBackwardCoord) / // available width for series
            (seriesBackwardPressure + 1); // # of segments in the series

        // use this segment's coordinates to computed the coordinates of the less-pressurized
        // forward segments
        for (i=0; i<forwardSegs.length; i++) {
            computeSlotSegCoords(forwardSegs[i], 0, seg.forwardCoord);
        }
    }
}


// Find all the segments in `otherSegs` that vertically collide with `seg`.
// Append into an optionally-supplied `results` array and return.
function computeSlotSegCollisions(seg, otherSegs, results) {
    results = results || [];

    for (var i=0; i<otherSegs.length; i++) {
        if (isSlotSegCollision(seg, otherSegs[i])) {
            results.push(otherSegs[i]);
        }
    }

    return results;
}


// Do these segments occupy the same vertical space?
function isSlotSegCollision(seg1, seg2) {
    return seg1.bottom > seg2.top && seg1.top < seg2.bottom;
}


// A cmp function for determining which forward segment to rely on more when computing coordinates.
function compareForwardSlotSegs(seg1, seg2) {
    // put higher-pressure first
    return seg2.forwardPressure - seg1.forwardPressure ||
        // put segments that are closer to initial edge first (and favor ones with no coords yet)
        (seg1.backwardCoord || 0) - (seg2.backwardCoord || 0) ||
        // do normal sorting...
        compareSegs(seg1, seg2);
}

;;

/* An abstract class from which other views inherit from
----------------------------------------------------------------------------------------------------------------------*/
// Newer methods should be written as prototype methods, not in the monster `View` function at the bottom.

View.prototype = {

    calendar: null, // owner Calendar object
    coordMap: null, // a CoordMap object for converting pixel regions to dates
    el: null, // the view's containing element. set by Calendar

    // important Moments
    start: null, // the date of the very first cell
    end: null, // the date after the very last cell
    intervalStart: null, // the start of the interval of time the view represents (1st of month for month view)
    intervalEnd: null, // the exclusive end of the interval of time the view represents

    // used for cell-to-date and date-to-cell calculations
    rowCnt: null, // # of weeks
    colCnt: null, // # of days displayed in a week

    isSelected: false, // boolean whether cells are user-selected or not

    // subclasses can optionally use a scroll container
    scrollerEl: null, // the element that will most likely scroll when content is too tall
    scrollTop: null, // cached vertical scroll value

    // classNames styled by jqui themes
    widgetHeaderClass: null,
    widgetContentClass: null,
    highlightStateClass: null,

    // document handlers, bound to `this` object
    documentMousedownProxy: null,
    documentDragStartProxy: null,


    // Serves as a "constructor" to suppliment the monster `View` constructor below
    init: function() {
        var tm = this.opt('theme') ? 'ui' : 'fc';

        this.widgetHeaderClass = tm + '-widget-header';
        this.widgetContentClass = tm + '-widget-content';
        this.highlightStateClass = tm + '-state-highlight';

        // save references to `this`-bound handlers
        this.documentMousedownProxy = $.proxy(this, 'documentMousedown');
        this.documentDragStartProxy = $.proxy(this, 'documentDragStart');
    },


    // Renders the view inside an already-defined `this.el`.
    // Subclasses should override this and then call the super method afterwards.
    render: function() {
        this.updateSize();
        this.trigger('viewRender', this, this, this.el);

        // attach handlers to document. do it here to allow for destroy/rerender
        $(document)
            .on('mousedown', this.documentMousedownProxy)
            .on('dragstart', this.documentDragStartProxy); // jqui drag
    },


    // Clears all view rendering, event elements, and unregisters handlers
    destroy: function() {
        this.unselect();
        this.trigger('viewDestroy', this, this, this.el);
        this.destroyEvents();
        this.el.empty(); // removes inner contents but leaves the element intact

        $(document)
            .off('mousedown', this.documentMousedownProxy)
            .off('dragstart', this.documentDragStartProxy);
    },


    // Used to determine what happens when the users clicks next/prev. Given -1 for prev, 1 for next.
    // Should apply the delta to `date` (a Moment) and return it.
    incrementDate: function(date, delta) {
        // subclasses should implement
    },


    /* Dimensions
    ------------------------------------------------------------------------------------------------------------------*/


    // Refreshes anything dependant upon sizing of the container element of the grid
    updateSize: function(isResize) {
        if (isResize) {
            this.recordScroll();
        }
        this.updateHeight();
        this.updateWidth();
    },


    // Refreshes the horizontal dimensions of the calendar
    updateWidth: function() {
        // subclasses should implement
    },


    // Refreshes the vertical dimensions of the calendar
    updateHeight: function() {
        var calendar = this.calendar; // we poll the calendar for height information

        this.setHeight(
            calendar.getSuggestedViewHeight(),
            calendar.isHeightAuto()
        );
    },


    // Updates the vertical dimensions of the calendar to the specified height.
    // if `isAuto` is set to true, height becomes merely a suggestion and the view should use its "natural" height.
    setHeight: function(height, isAuto) {
        // subclasses should implement
    },


    // Given the total height of the view, return the number of pixels that should be used for the scroller.
    // Utility for subclasses.
    computeScrollerHeight: function(totalHeight) {
        var both = this.el.add(this.scrollerEl);
        var otherHeight; // cumulative height of everything that is not the scrollerEl in the view (header+borders)

        // fuckin IE8/9/10/11 sometimes returns 0 for dimensions. this weird hack was the only thing that worked
        both.css({
            position: 'relative', // cause a reflow, which will force fresh dimension recalculation
            left: -1 // ensure reflow in case the el was already relative. negative is less likely to cause new scroll
        });
        otherHeight = this.el.outerHeight() - this.scrollerEl.height(); // grab the dimensions
        both.css({ position: '', left: '' }); // undo hack

        return totalHeight - otherHeight;
    },


    // Called for remembering the current scroll value of the scroller.
    // Should be called before there is a destructive operation (like removing DOM elements) that might inadvertently
    // change the scroll of the container.
    recordScroll: function() {
        if (this.scrollerEl) {
            this.scrollTop = this.scrollerEl.scrollTop();
        }
    },


    // Set the scroll value of the scroller to the previously recorded value.
    // Should be called after we know the view's dimensions have been restored following some type of destructive
    // operation (like temporarily removing DOM elements).
    restoreScroll: function() {
        if (this.scrollTop !== null) {
            this.scrollerEl.scrollTop(this.scrollTop);
        }
    },


    /* Events
    ------------------------------------------------------------------------------------------------------------------*/


    // Renders the events onto the view.
    // Should be overriden by subclasses. Subclasses should call the super-method afterwards.
    renderEvents: function(events) {
        this.segEach(function(seg) {
            this.trigger('eventAfterRender', seg.event, seg.event, seg.el);
        });
        this.trigger('eventAfterAllRender');
    },


    // Removes event elements from the view.
    // Should be overridden by subclasses. Should call this super-method FIRST, then subclass DOM destruction.
    destroyEvents: function() {
        this.segEach(function(seg) {
            this.trigger('eventDestroy', seg.event, seg.event, seg.el);
        });
    },


    // Given an event and the default element used for rendering, returns the element that should actually be used.
    // Basically runs events and elements through the eventRender hook.
    resolveEventEl: function(event, el) {
        var custom = this.trigger('eventRender', event, event, el);

        if (custom === false) { // means don't render at all
            el = null;
        }
        else if (custom && custom !== true) {
            el = $(custom);
        }

        return el;
    },


    // Hides all rendered event segments linked to the given event
    showEvent: function(event) {
        this.segEach(function(seg) {
            seg.el.css('visibility', '');
        }, event);
    },


    // Shows all rendered event segments linked to the given event
    hideEvent: function(event) {
        this.segEach(function(seg) {
            seg.el.css('visibility', 'hidden');
        }, event);
    },


    // Iterates through event segments. Goes through all by default.
    // If the optional `event` argument is specified, only iterates through segments linked to that event.
    // The `this` value of the callback function will be the view.
    segEach: function(func, event) {
        var segs = this.getSegs();
        var i;

        for (i = 0; i < segs.length; i++) {
            if (!event || segs[i].event._id === event._id) {
                func.call(this, segs[i]);
            }
        }
    },


    // Retrieves all the rendered segment objects for the view
    getSegs: function() {
        // subclasses must implement
    },


    /* Event Drag Visualization
    ------------------------------------------------------------------------------------------------------------------*/


    // Renders a visual indication of an event hovering over the specified date.
    // `end` is a Moment and might be null.
    // `seg` might be null. if specified, it is the segment object of the event being dragged.
    //       otherwise, an external event from outside the calendar is being dragged.
    renderDrag: function(start, end, seg) {
        // subclasses should implement
    },


    // Unrenders a visual indication of event hovering
    destroyDrag: function() {
        // subclasses should implement
    },


    // Handler for accepting externally dragged events being dropped in the view.
    // Gets called when jqui's 'dragstart' is fired.
    documentDragStart: function(ev, ui) {
        var _this = this;
        var calendar = this.calendar;
        var eventStart = null; // a null value signals an unsuccessful drag
        var eventEnd = null;
        var visibleEnd = null; // will be calculated event when no eventEnd
        var el;
        var accept;
        var meta;
        var eventProps; // if an object, signals an event should be created upon drop
        var dragListener;

        if (this.opt('droppable')) { // only listen if this setting is on
            el = $(ev.target);

            // Test that the dragged element passes the dropAccept selector or filter function.
            // FYI, the default is "*" (matches all)
            accept = this.opt('dropAccept');
            if ($.isFunction(accept) ? accept.call(el[0], el) : el.is(accept)) {

                meta = getDraggedElMeta(el); // data for possibly creating an event
                eventProps = meta.eventProps;

                // listener that tracks mouse movement over date-associated pixel regions
                dragListener = new DragListener(this.coordMap, {
                    cellOver: function(cell, cellDate) {
                        eventStart = cellDate;
                        eventEnd = meta.duration ? eventStart.clone().add(meta.duration) : null;
                        visibleEnd = eventEnd || calendar.getDefaultEventEnd(!eventStart.hasTime(), eventStart);

                        // keep the start/end up to date when dragging
                        if (eventProps) {
                            $.extend(eventProps, { start: eventStart, end: eventEnd });
                        }

                        if (calendar.isExternalDragAllowedInRange(eventStart, visibleEnd, eventProps)) {
                            _this.renderDrag(eventStart, visibleEnd);
                        }
                        else {
                            eventStart = null; // signal unsuccessful
                            disableCursor();
                        }
                    },
                    cellOut: function() {
                        eventStart = null;
                        _this.destroyDrag();
                        enableCursor();
                    }
                });

                // gets called, only once, when jqui drag is finished
                $(document).one('dragstop', function(ev, ui) {
                    var renderedEvents;

                    _this.destroyDrag();
                    enableCursor();

                    if (eventStart) { // element was dropped on a valid date/time cell

                        // if dropped on an all-day cell, and element's metadata specified a time, set it
                        if (meta.startTime && !eventStart.hasTime()) {
                            eventStart.time(meta.startTime);
                        }

                        // trigger 'drop' regardless of whether element represents an event
                        _this.trigger('drop', el[0], eventStart, ev, ui);

                        // create an event from the given properties and the latest dates
                        if (eventProps) {
                            renderedEvents = calendar.renderEvent(eventProps, meta.stick);
                            _this.trigger('eventReceive', null, renderedEvents[0]); // signal an external event landed
                        }
                    }
                });

                dragListener.startDrag(ev); // start listening immediately
            }
        }
    },


    /* Selection
    ------------------------------------------------------------------------------------------------------------------*/


    // Selects a date range on the view. `start` and `end` are both Moments.
    // `ev` is the native mouse event that begin the interaction.
    select: function(start, end, ev) {
        this.unselect(ev);
        this.renderSelection(start, end);
        this.reportSelection(start, end, ev);
    },


    // Renders a visual indication of the selection
    renderSelection: function(start, end) {
        // subclasses should implement
    },


    // Called when a new selection is made. Updates internal state and triggers handlers.
    reportSelection: function(start, end, ev) {
        this.isSelected = true;
        this.trigger('select', null, start, end, ev);
    },


    // Undoes a selection. updates in the internal state and triggers handlers.
    // `ev` is the native mouse event that began the interaction.
    unselect: function(ev) {
        if (this.isSelected) {
            this.isSelected = false;
            this.destroySelection();
            this.trigger('unselect', null, ev);
        }
    },


    // Unrenders a visual indication of selection
    destroySelection: function() {
        // subclasses should implement
    },


    // Handler for unselecting when the user clicks something and the 'unselectAuto' setting is on
    documentMousedown: function(ev) {
        var ignore;

        // is there a selection, and has the user made a proper left click?
        if (this.isSelected && this.opt('unselectAuto') && isPrimaryMouseButton(ev)) {

            // only unselect if the clicked element is not identical to or inside of an 'unselectCancel' element
            ignore = this.opt('unselectCancel');
            if (!ignore || !$(ev.target).closest(ignore).length) {
                this.unselect(ev);
            }
        }
    }

};


// We are mixing JavaScript OOP design patterns here by putting methods and member variables in the closed scope of the
// constructor. Going forward, methods should be part of the prototype.
function View(calendar) {
    var t = this;

    // exports
    t.calendar = calendar;
    t.opt = opt;
    t.trigger = trigger;
    t.isEventDraggable = isEventDraggable;
    t.isEventResizable = isEventResizable;
    t.eventDrop = eventDrop;
    t.eventResize = eventResize;

    // imports
    var reportEventChange = calendar.reportEventChange;

    // locals
    var options = calendar.options;
    var nextDayThreshold = moment.duration(options.nextDayThreshold);


    t.init(); // the "constructor" that concerns the prototype methods


    function opt(name) {
        var v = options[name];
        if ($.isPlainObject(v) && !isForcedAtomicOption(name)) {
            return smartProperty(v, t.name);
        }
        return v;
    }


    function trigger(name, thisObj) {
        return calendar.trigger.apply(
            calendar,
            [name, thisObj || t].concat(Array.prototype.slice.call(arguments, 2), [t])
        );
    }



    /* Event Editable Boolean Calculations
    ------------------------------------------------------------------------------*/


    function isEventDraggable(event) {
        var source = event.source || {};

        return firstDefined(
            event.startEditable,
            source.startEditable,
            opt('eventStartEditable'),
            event.editable,
            source.editable,
            opt('editable')
        );
    }


    function isEventResizable(event) {
        var source = event.source || {};

        return firstDefined(
            event.durationEditable,
            source.durationEditable,
            opt('eventDurationEditable'),
            event.editable,
            source.editable,
            opt('editable')
        );
    }



    /* Event Elements
    ------------------------------------------------------------------------------*/


    // Compute the text that should be displayed on an event's element.
    // Based off the settings of the view. Possible signatures:
    //   .getEventTimeText(event, formatStr)
    //   .getEventTimeText(startMoment, endMoment, formatStr)
    //   .getEventTimeText(startMoment, null, formatStr)
    // `timeFormat` is used but the `formatStr` argument can be used to override.
    t.getEventTimeText = function(event, formatStr) {
        var start;
        var end;

        if (typeof event === 'object' && typeof formatStr === 'object') {
            // first two arguments are actually moments (or null). shift arguments.
            start = event;
            end = formatStr;
            formatStr = arguments[2];
        }
        else {
            // otherwise, an event object was the first argument
            start = event.start;
            end = event.end;
        }

        formatStr = formatStr || opt('timeFormat');

        if (end && opt('displayEventEnd')) {
            return calendar.formatRange(start, end, formatStr);
        }
        else {
            return calendar.formatDate(start, formatStr);
        }
    };



    /* Event Modification Reporting
    ---------------------------------------------------------------------------------*/


    function eventDrop(el, event, newStart, ev) {
        var mutateResult = calendar.mutateEvent(event, newStart, null);

        trigger(
            'eventDrop',
            el,
            event,
            mutateResult.dateDelta,
            function() {
                mutateResult.undo();
                reportEventChange();
            },
            ev,
            {} // jqui dummy
        );

        reportEventChange();
    }


    function eventResize(el, event, newEnd, ev) {
        var mutateResult = calendar.mutateEvent(event, null, newEnd);

        trigger(
            'eventResize',
            el,
            event,
            mutateResult.durationDelta,
            function() {
                mutateResult.undo();
                reportEventChange();
            },
            ev,
            {} // jqui dummy
        );

        reportEventChange();
    }


    // ====================================================================================================
    // Utilities for day "cells"
    // ====================================================================================================
    // The "basic" views are completely made up of day cells.
    // The "agenda" views have day cells at the top "all day" slot.
    // This was the obvious common place to put these utilities, but they should be abstracted out into
    // a more meaningful class (like DayEventRenderer).
    // ====================================================================================================


    // For determining how a given "cell" translates into a "date":
    //
    // 1. Convert the "cell" (row and column) into a "cell offset" (the # of the cell, cronologically from the first).
    //    Keep in mind that column indices are inverted with isRTL. This is taken into account.
    //
    // 2. Convert the "cell offset" to a "day offset" (the # of days since the first visible day in the view).
    //
    // 3. Convert the "day offset" into a "date" (a Moment).
    //
    // The reverse transformation happens when transforming a date into a cell.


    // exports
    t.isHiddenDay = isHiddenDay;
    t.skipHiddenDays = skipHiddenDays;
    t.getCellsPerWeek = getCellsPerWeek;
    t.dateToCell = dateToCell;
    t.dateToDayOffset = dateToDayOffset;
    t.dayOffsetToCellOffset = dayOffsetToCellOffset;
    t.cellOffsetToCell = cellOffsetToCell;
    t.cellToDate = cellToDate;
    t.cellToCellOffset = cellToCellOffset;
    t.cellOffsetToDayOffset = cellOffsetToDayOffset;
    t.dayOffsetToDate = dayOffsetToDate;
    t.rangeToSegments = rangeToSegments;
    t.isMultiDayEvent = isMultiDayEvent;


    // internals
    var hiddenDays = opt('hiddenDays') || []; // array of day-of-week indices that are hidden
    var isHiddenDayHash = []; // is the day-of-week hidden? (hash with day-of-week-index -> bool)
    var cellsPerWeek;
    var dayToCellMap = []; // hash from dayIndex -> cellIndex, for one week
    var cellToDayMap = []; // hash from cellIndex -> dayIndex, for one week
    var isRTL = opt('isRTL');


    // initialize important internal variables
    (function() {

        if (opt('weekends') === false) {
            hiddenDays.push(0, 6); // 0=sunday, 6=saturday
        }

        // Loop through a hypothetical week and determine which
        // days-of-week are hidden. Record in both hashes (one is the reverse of the other).
        for (var dayIndex=0, cellIndex=0; dayIndex<7; dayIndex++) {
            dayToCellMap[dayIndex] = cellIndex;
            isHiddenDayHash[dayIndex] = $.inArray(dayIndex, hiddenDays) != -1;
            if (!isHiddenDayHash[dayIndex]) {
                cellToDayMap[cellIndex] = dayIndex;
                cellIndex++;
            }
        }

        cellsPerWeek = cellIndex;
        if (!cellsPerWeek) {
            throw 'invalid hiddenDays'; // all days were hidden? bad.
        }

    })();


    // Is the current day hidden?
    // `day` is a day-of-week index (0-6), or a Moment
    function isHiddenDay(day) {
        if (moment.isMoment(day)) {
            day = day.day();
        }
        return isHiddenDayHash[day];
    }


    function getCellsPerWeek() {
        return cellsPerWeek;
    }


    // Incrementing the current day until it is no longer a hidden day, returning a copy.
    // If the initial value of `date` is not a hidden day, don't do anything.
    // Pass `isExclusive` as `true` if you are dealing with an end date.
    // `inc` defaults to `1` (increment one day forward each time)
    function skipHiddenDays(date, inc, isExclusive) {
        var out = date.clone();
        inc = inc || 1;
        while (
            isHiddenDayHash[(out.day() + (isExclusive ? inc : 0) + 7) % 7]
        ) {
            out.add(inc, 'days');
        }
        return out;
    }


    //
    // TRANSFORMATIONS: cell -> cell offset -> day offset -> date
    //

    // cell -> date (combines all transformations)
    // Possible arguments:
    // - row, col
    // - { row:#, col: # }
    function cellToDate() {
        var cellOffset = cellToCellOffset.apply(null, arguments);
        var dayOffset = cellOffsetToDayOffset(cellOffset);
        var date = dayOffsetToDate(dayOffset);
        return date;
    }

    // cell -> cell offset
    // Possible arguments:
    // - row, col
    // - { row:#, col:# }
    function cellToCellOffset(row, col) {
        var colCnt = t.colCnt;

        // rtl variables. wish we could pre-populate these. but where?
        var dis = isRTL ? -1 : 1;
        var dit = isRTL ? colCnt - 1 : 0;

        if (typeof row == 'object') {
            col = row.col;
            row = row.row;
        }
        var cellOffset = row * colCnt + (col * dis + dit); // column, adjusted for RTL (dis & dit)

        return cellOffset;
    }

    // cell offset -> day offset
    function cellOffsetToDayOffset(cellOffset) {
        var day0 = t.start.day(); // first date's day of week
        cellOffset += dayToCellMap[day0]; // normlize cellOffset to beginning-of-week
        return Math.floor(cellOffset / cellsPerWeek) * 7 + // # of days from full weeks
            cellToDayMap[ // # of days from partial last week
                (cellOffset % cellsPerWeek + cellsPerWeek) % cellsPerWeek // crazy math to handle negative cellOffsets
            ] -
            day0; // adjustment for beginning-of-week normalization
    }

    // day offset -> date
    function dayOffsetToDate(dayOffset) {
        return t.start.clone().add(dayOffset, 'days');
    }


    //
    // TRANSFORMATIONS: date -> day offset -> cell offset -> cell
    //

    // date -> cell (combines all transformations)
    function dateToCell(date) {
        var dayOffset = dateToDayOffset(date);
        var cellOffset = dayOffsetToCellOffset(dayOffset);
        var cell = cellOffsetToCell(cellOffset);
        return cell;
    }

    // date -> day offset
    function dateToDayOffset(date) {
        return date.clone().stripTime().diff(t.start, 'days');
    }

    // day offset -> cell offset
    function dayOffsetToCellOffset(dayOffset) {
        var day0 = t.start.day(); // first date's day of week
        dayOffset += day0; // normalize dayOffset to beginning-of-week
        return Math.floor(dayOffset / 7) * cellsPerWeek + // # of cells from full weeks
            dayToCellMap[ // # of cells from partial last week
                (dayOffset % 7 + 7) % 7 // crazy math to handle negative dayOffsets
            ] -
            dayToCellMap[day0]; // adjustment for beginning-of-week normalization
    }

    // cell offset -> cell (object with row & col keys)
    function cellOffsetToCell(cellOffset) {
        var colCnt = t.colCnt;

        // rtl variables. wish we could pre-populate these. but where?
        var dis = isRTL ? -1 : 1;
        var dit = isRTL ? colCnt - 1 : 0;

        var row = Math.floor(cellOffset / colCnt);
        var col = ((cellOffset % colCnt + colCnt) % colCnt) * dis + dit; // column, adjusted for RTL (dis & dit)
        return {
            row: row,
            col: col
        };
    }


    //
    // Converts a date range into an array of segment objects.
    // "Segments" are horizontal stretches of time, sliced up by row.
    // A segment object has the following properties:
    // - row
    // - cols
    // - isStart
    // - isEnd
    //
    function rangeToSegments(start, end) {

        var rowCnt = t.rowCnt;
        var colCnt = t.colCnt;
        var segments = []; // array of segments to return

        // day offset for given date range
        var dayRange = computeDayRange(start, end); // convert to a whole-day range
        var rangeDayOffsetStart = dateToDayOffset(dayRange.start);
        var rangeDayOffsetEnd = dateToDayOffset(dayRange.end); // an exclusive value

        // first and last cell offset for the given date range
        // "last" implies inclusivity
        var rangeCellOffsetFirst = dayOffsetToCellOffset(rangeDayOffsetStart);
        var rangeCellOffsetLast = dayOffsetToCellOffset(rangeDayOffsetEnd) - 1;

        // loop through all the rows in the view
        for (var row=0; row<rowCnt; row++) {

            // first and last cell offset for the row
            var rowCellOffsetFirst = row * colCnt;
            var rowCellOffsetLast = rowCellOffsetFirst + colCnt - 1;

            // get the segment's cell offsets by constraining the range's cell offsets to the bounds of the row
            var segmentCellOffsetFirst = Math.max(rangeCellOffsetFirst, rowCellOffsetFirst);
            var segmentCellOffsetLast = Math.min(rangeCellOffsetLast, rowCellOffsetLast);

            // make sure segment's offsets are valid and in view
            if (segmentCellOffsetFirst <= segmentCellOffsetLast) {

                // translate to cells
                var segmentCellFirst = cellOffsetToCell(segmentCellOffsetFirst);
                var segmentCellLast = cellOffsetToCell(segmentCellOffsetLast);

                // view might be RTL, so order by leftmost column
                var cols = [ segmentCellFirst.col, segmentCellLast.col ].sort();

                // Determine if segment's first/last cell is the beginning/end of the date range.
                // We need to compare "day offset" because "cell offsets" are often ambiguous and
                // can translate to multiple days, and an edge case reveals itself when we the
                // range's first cell is hidden (we don't want isStart to be true).
                var isStart = cellOffsetToDayOffset(segmentCellOffsetFirst) == rangeDayOffsetStart;
                var isEnd = cellOffsetToDayOffset(segmentCellOffsetLast) + 1 == rangeDayOffsetEnd;
                                                                   // +1 for comparing exclusively

                segments.push({
                    row: row,
                    leftCol: cols[0],
                    rightCol: cols[1],
                    isStart: isStart,
                    isEnd: isEnd
                });
            }
        }

        return segments;
    }


    // Returns the date range of the full days the given range visually appears to occupy.
    // Returns object with properties `start` (moment) and `end` (moment, exclusive end).
    function computeDayRange(start, end) {
        var startDay = start.clone().stripTime(); // the beginning of the day the range starts
        var endDay;
        var endTimeMS;

        if (end) {
            endDay = end.clone().stripTime(); // the beginning of the day the range exclusively ends
            endTimeMS = +end.time(); // # of milliseconds into `endDay`

            // If the end time is actually inclusively part of the next day and is equal to or
            // beyond the next day threshold, adjust the end to be the exclusive end of `endDay`.
            // Otherwise, leaving it as inclusive will cause it to exclude `endDay`.
            if (endTimeMS && endTimeMS >= nextDayThreshold) {
                endDay.add(1, 'days');
            }
        }

        // If no end was specified, or if it is within `startDay` but not past nextDayThreshold,
        // assign the default duration of one day.
        if (!end || endDay <= startDay) {
            endDay = startDay.clone().add(1, 'days');
        }

        return { start: startDay, end: endDay };
    }


    // Does the given event visually appear to occupy more than one day?
    function isMultiDayEvent(event) {
        var range = computeDayRange(event.start, event.end);

        return range.end.diff(range.start, 'days') > 1;
    }

}


/* Utils
----------------------------------------------------------------------------------------------------------------------*/

// Require all HTML5 data-* attributes used by FullCalendar to have this prefix.
// A value of '' will query attributes like data-event. A value of 'fc' will query attributes like data-fc-event.
fc.dataAttrPrefix = '';

// Given a jQuery element that might represent a dragged FullCalendar event, returns an intermediate data structure
// to be used for Event Object creation.
// A defined `.eventProps`, even when empty, indicates that an event should be created.
function getDraggedElMeta(el) {
    var prefix = fc.dataAttrPrefix;
    var eventProps; // properties for creating the event, not related to date/time
    var startTime; // a Duration
    var duration;
    var stick;

    if (prefix) { prefix += '-'; }
    eventProps = el.data(prefix + 'event') || null;

    if (eventProps) {
        if (typeof eventProps === 'object') {
            eventProps = $.extend({}, eventProps); // make a copy
        }
        else { // something like 1 or true. still signal event creation
            eventProps = {};
        }

        // pluck special-cased date/time properties
        startTime = eventProps.start;
        if (startTime == null) { startTime = eventProps.time; } // accept 'time' as well
        duration = eventProps.duration;
        stick = eventProps.stick;
        delete eventProps.start;
        delete eventProps.time;
        delete eventProps.duration;
        delete eventProps.stick;
    }

    // fallback to standalone attribute values for each of the date/time properties
    if (startTime == null) { startTime = el.data(prefix + 'start'); }
    if (startTime == null) { startTime = el.data(prefix + 'time'); } // accept 'time' as well
    if (duration == null) { duration = el.data(prefix + 'duration'); }
    if (stick == null) { stick = el.data(prefix + 'stick'); }

    // massage into correct data types
    startTime = startTime != null ? moment.duration(startTime) : null;
    duration = duration != null ? moment.duration(duration) : null;
    stick = Boolean(stick);

    return { eventProps: eventProps, startTime: startTime, duration: duration, stick: stick };
}

;;

/* An abstract class for the "basic" views, as well as month view. Renders one or more rows of day cells.
----------------------------------------------------------------------------------------------------------------------*/
// It is a manager for a DayGrid subcomponent, which does most of the heavy lifting.
// It is responsible for managing width/height.

function BasicView(calendar) {
    View.call(this, calendar); // call the super-constructor
    this.dayGrid = new DayGrid(this);
    this.coordMap = this.dayGrid.coordMap; // the view's date-to-cell mapping is identical to the subcomponent's
}


BasicView.prototype = createObject(View.prototype); // define the super-class
$.extend(BasicView.prototype, {

    dayGrid: null, // the main subcomponent that does most of the heavy lifting

    dayNumbersVisible: false, // display day numbers on each day cell?
    weekNumbersVisible: false, // display week numbers along the side?

    weekNumberWidth: null, // width of all the week-number cells running down the side

    headRowEl: null, // the fake row element of the day-of-week header


    // Renders the view into `this.el`, which should already be assigned.
    // rowCnt, colCnt, and dayNumbersVisible have been calculated by a subclass and passed here.
    render: function(rowCnt, colCnt, dayNumbersVisible) {

        // needed for cell-to-date and date-to-cell calculations in View
        this.rowCnt = rowCnt;
        this.colCnt = colCnt;

        this.dayNumbersVisible = dayNumbersVisible;
        this.weekNumbersVisible = this.opt('weekNumbers');
        this.dayGrid.numbersVisible = this.dayNumbersVisible || this.weekNumbersVisible;

        this.el.addClass('fc-basic-view').html(this.renderHtml());

        this.headRowEl = this.el.find('thead .fc-row');

        this.scrollerEl = this.el.find('.fc-day-grid-container');
        this.dayGrid.coordMap.containerEl = this.scrollerEl; // constrain clicks/etc to the dimensions of the scroller

        this.dayGrid.el = this.el.find('.fc-day-grid');
        this.dayGrid.render(this.hasRigidRows());

        View.prototype.render.call(this); // call the super-method
    },


    // Make subcomponents ready for cleanup
    destroy: function() {
        this.dayGrid.destroy();
        View.prototype.destroy.call(this); // call the super-method
    },


    // Builds the HTML skeleton for the view.
    // The day-grid component will render inside of a container defined by this HTML.
    renderHtml: function() {
        return '' +
            '<table>' +
                '<thead>' +
                    '<tr>' +
                        '<td class="' + this.widgetHeaderClass + '">' +
                            this.dayGrid.headHtml() + // render the day-of-week headers
                        '</td>' +
                    '</tr>' +
                '</thead>' +
                '<tbody>' +
                    '<tr>' +
                        '<td class="' + this.widgetContentClass + '">' +
                            '<div class="fc-day-grid-container">' +
                                '<div class="fc-day-grid"/>' +
                            '</div>' +
                        '</td>' +
                    '</tr>' +
                '</tbody>' +
            '</table>';
    },


    // Generates the HTML that will go before the day-of week header cells.
    // Queried by the DayGrid subcomponent when generating rows. Ordering depends on isRTL.
    headIntroHtml: function() {
        if (this.weekNumbersVisible) {
            return '' +
                '<th class="fc-week-number ' + this.widgetHeaderClass + '" ' + this.weekNumberStyleAttr() + '>' +
                    '<span>' + // needed for matchCellWidths
                        htmlEscape(this.opt('weekNumberTitle')) +
                    '</span>' +
                '</th>';
        }
    },


    // Generates the HTML that will go before content-skeleton cells that display the day/week numbers.
    // Queried by the DayGrid subcomponent. Ordering depends on isRTL.
    numberIntroHtml: function(row) {
        if (this.weekNumbersVisible) {
            return '' +
                '<td class="fc-week-number" ' + this.weekNumberStyleAttr() + '>' +
                    '<span>' + // needed for matchCellWidths
                        this.calendar.calculateWeekNumber(this.cellToDate(row, 0)) +
                    '</span>' +
                '</td>';
        }
    },


    // Generates the HTML that goes before the day bg cells for each day-row.
    // Queried by the DayGrid subcomponent. Ordering depends on isRTL.
    dayIntroHtml: function() {
        if (this.weekNumbersVisible) {
            return '<td class="fc-week-number ' + this.widgetContentClass + '" ' +
                this.weekNumberStyleAttr() + '></td>';
        }
    },


    // Generates the HTML that goes before every other type of row generated by DayGrid. Ordering depends on isRTL.
    // Affects helper-skeleton and highlight-skeleton rows.
    introHtml: function() {
        if (this.weekNumbersVisible) {
            return '<td class="fc-week-number" ' + this.weekNumberStyleAttr() + '></td>';
        }
    },


    // Generates the HTML for the <td>s of the "number" row in the DayGrid's content skeleton.
    // The number row will only exist if either day numbers or week numbers are turned on.
    numberCellHtml: function(row, col, date) {
        var classes;

        if (!this.dayNumbersVisible) { // if there are week numbers but not day numbers
            return '<td/>'; //  will create an empty space above events :(
        }

        classes = this.dayGrid.getDayClasses(date);
        classes.unshift('fc-day-number');

        return '' +
            '<td class="' + classes.join(' ') + '" data-date="' + date.format() + '">' +
                date.date() +
            '</td>';
    },


    // Generates an HTML attribute string for setting the width of the week number column, if it is known
    weekNumberStyleAttr: function() {
        if (this.weekNumberWidth !== null) {
            return 'style="width:' + this.weekNumberWidth + 'px"';
        }
        return '';
    },


    // Determines whether each row should have a constant height
    hasRigidRows: function() {
        var eventLimit = this.opt('eventLimit');
        return eventLimit && typeof eventLimit !== 'number';
    },


    /* Dimensions
    ------------------------------------------------------------------------------------------------------------------*/


    // Refreshes the horizontal dimensions of the view
    updateWidth: function() {
        if (this.weekNumbersVisible) {
            // Make sure all week number cells running down the side have the same width.
            // Record the width for cells created later.
            this.weekNumberWidth = matchCellWidths(
                this.el.find('.fc-week-number')
            );
        }
    },


    // Adjusts the vertical dimensions of the view to the specified values
    setHeight: function(totalHeight, isAuto) {
        var eventLimit = this.opt('eventLimit');
        var scrollerHeight;

        // reset all heights to be natural
        unsetScroller(this.scrollerEl);
        uncompensateScroll(this.headRowEl);

        this.dayGrid.destroySegPopover(); // kill the "more" popover if displayed

        // is the event limit a constant level number?
        if (eventLimit && typeof eventLimit === 'number') {
            this.dayGrid.limitRows(eventLimit); // limit the levels first so the height can redistribute after
        }

        scrollerHeight = this.computeScrollerHeight(totalHeight);
        this.setGridHeight(scrollerHeight, isAuto);

        // is the event limit dynamically calculated?
        if (eventLimit && typeof eventLimit !== 'number') {
            this.dayGrid.limitRows(eventLimit); // limit the levels after the grid's row heights have been set
        }

        if (!isAuto && setPotentialScroller(this.scrollerEl, scrollerHeight)) { // using scrollbars?

            compensateScroll(this.headRowEl, getScrollbarWidths(this.scrollerEl));

            // doing the scrollbar compensation might have created text overflow which created more height. redo
            scrollerHeight = this.computeScrollerHeight(totalHeight);
            this.scrollerEl.height(scrollerHeight);

            this.restoreScroll();
        }
    },


    // Sets the height of just the DayGrid component in this view
    setGridHeight: function(height, isAuto) {
        if (isAuto) {
            undistributeHeight(this.dayGrid.rowEls); // let the rows be their natural height with no expanding
        }
        else {
            distributeHeight(this.dayGrid.rowEls, height, true); // true = compensate for height-hogging rows
        }
    },


    /* Events
    ------------------------------------------------------------------------------------------------------------------*/


    // Renders the given events onto the view and populates the segments array
    renderEvents: function(events) {
        this.dayGrid.renderEvents(events);

        this.updateHeight(); // must compensate for events that overflow the row

        View.prototype.renderEvents.call(this, events); // call the super-method
    },


    // Retrieves all segment objects that are rendered in the view
    getSegs: function() {
        return this.dayGrid.getSegs();
    },


    // Unrenders all event elements and clears internal segment data
    destroyEvents: function() {
        View.prototype.destroyEvents.call(this); // do this before dayGrid's segs have been cleared

        this.recordScroll(); // removing events will reduce height and mess with the scroll, so record beforehand
        this.dayGrid.destroyEvents();

        // we DON'T need to call updateHeight() because:
        // A) a renderEvents() call always happens after this, which will eventually call updateHeight()
        // B) in IE8, this causes a flash whenever events are rerendered
    },


    /* Event Dragging
    ------------------------------------------------------------------------------------------------------------------*/


    // Renders a visual indication of an event being dragged over the view.
    // A returned value of `true` signals that a mock "helper" event has been rendered.
    renderDrag: function(start, end, seg) {
        return this.dayGrid.renderDrag(start, end, seg);
    },


    // Unrenders the visual indication of an event being dragged over the view
    destroyDrag: function() {
        this.dayGrid.destroyDrag();
    },


    /* Selection
    ------------------------------------------------------------------------------------------------------------------*/


    // Renders a visual indication of a selection
    renderSelection: function(start, end) {
        this.dayGrid.renderSelection(start, end);
    },


    // Unrenders a visual indications of a selection
    destroySelection: function() {
        this.dayGrid.destroySelection();
    }

});

;;

/* A month view with day cells running in rows (one-per-week) and columns
----------------------------------------------------------------------------------------------------------------------*/

setDefaults({
    fixedWeekCount: true
});

fcViews.month = MonthView; // register the view

function MonthView(calendar) {
    BasicView.call(this, calendar); // call the super-constructor
}


MonthView.prototype = createObject(BasicView.prototype); // define the super-class
$.extend(MonthView.prototype, {

    name: 'month',


    incrementDate: function(date, delta) {
        return date.clone().stripTime().add(delta, 'months').startOf('month');
    },


    render: function(date) {
        var rowCnt;

        this.intervalStart = date.clone().stripTime().startOf('month');
        this.intervalEnd = this.intervalStart.clone().add(1, 'months');

        this.start = this.intervalStart.clone();
        this.start = this.skipHiddenDays(this.start); // move past the first week if no visible days
        this.start.startOf('week');
        this.start = this.skipHiddenDays(this.start); // move past the first invisible days of the week

        this.end = this.intervalEnd.clone();
        this.end = this.skipHiddenDays(this.end, -1, true); // move in from the last week if no visible days
        this.end.add((7 - this.end.weekday()) % 7, 'days'); // move to end of week if not already
        this.end = this.skipHiddenDays(this.end, -1, true); // move in from the last invisible days of the week

        rowCnt = Math.ceil( // need to ceil in case there are hidden days
            this.end.diff(this.start, 'weeks', true) // returnfloat=true
        );
        if (this.isFixedWeeks()) {
            this.end.add(6 - rowCnt, 'weeks');
            rowCnt = 6;
        }

        this.title = this.calendar.formatDate(this.intervalStart, this.opt('titleFormat'));

        BasicView.prototype.render.call(this, rowCnt, this.getCellsPerWeek(), true); // call the super-method
    },


    // Overrides the default BasicView behavior to have special multi-week auto-height logic
    setGridHeight: function(height, isAuto) {

        isAuto = isAuto || this.opt('weekMode') === 'variable'; // LEGACY: weekMode is deprecated

        // if auto, make the height of each row the height that it would be if there were 6 weeks
        if (isAuto) {
            height *= this.rowCnt / 6;
        }

        distributeHeight(this.dayGrid.rowEls, height, !isAuto); // if auto, don't compensate for height-hogging rows
    },


    isFixedWeeks: function() {
        var weekMode = this.opt('weekMode'); // LEGACY: weekMode is deprecated
        if (weekMode) {
            return weekMode === 'fixed'; // if any other type of weekMode, assume NOT fixed
        }

        return this.opt('fixedWeekCount');
    }

});

;;

/* A week view with simple day cells running horizontally
----------------------------------------------------------------------------------------------------------------------*/
// TODO: a WeekView mixin for calculating dates and titles

fcViews.basicWeek = BasicWeekView; // register this view

function BasicWeekView(calendar) {
    BasicView.call(this, calendar); // call the super-constructor
}


BasicWeekView.prototype = createObject(BasicView.prototype); // define the super-class
$.extend(BasicWeekView.prototype, {

    name: 'basicWeek',


    incrementDate: function(date, delta) {
        return date.clone().stripTime().add(delta, 'weeks').startOf('week');
    },


    render: function(date) {

        this.intervalStart = date.clone().stripTime().startOf('week');
        this.intervalEnd = this.intervalStart.clone().add(1, 'weeks');

        this.start = this.skipHiddenDays(this.intervalStart);
        this.end = this.skipHiddenDays(this.intervalEnd, -1, true);

        this.title = this.calendar.formatRange(
            this.start,
            this.end.clone().subtract(1), // make inclusive by subtracting 1 ms
            this.opt('titleFormat'),
            ' \u2014 ' // emphasized dash
        );

        BasicView.prototype.render.call(this, 1, this.getCellsPerWeek(), false); // call the super-method
    }

});
;;

/* A view with a single simple day cell
----------------------------------------------------------------------------------------------------------------------*/

fcViews.basicDay = BasicDayView; // register this view

function BasicDayView(calendar) {
    BasicView.call(this, calendar); // call the super-constructor
}


BasicDayView.prototype = createObject(BasicView.prototype); // define the super-class
$.extend(BasicDayView.prototype, {

    name: 'basicDay',


    incrementDate: function(date, delta) {
        var out = date.clone().stripTime().add(delta, 'days');
        out = this.skipHiddenDays(out, delta < 0 ? -1 : 1);
        return out;
    },


    render: function(date) {

        this.start = this.intervalStart = date.clone().stripTime();
        this.end = this.intervalEnd = this.start.clone().add(1, 'days');

        this.title = this.calendar.formatDate(this.start, this.opt('titleFormat'));

        BasicView.prototype.render.call(this, 1, 1, false); // call the super-method
    }

});
;;

/* An abstract class for all agenda-related views. Displays one more columns with time slots running vertically.
----------------------------------------------------------------------------------------------------------------------*/
// Is a manager for the TimeGrid subcomponent and possibly the DayGrid subcomponent (if allDaySlot is on).
// Responsible for managing width/height.

setDefaults({
    allDaySlot: true,
    allDayText: 'all-day',

    scrollTime: '06:00:00',

    slotDuration: '00:30:00',

    axisFormat: generateAgendaAxisFormat,
    timeFormat: {
        agenda: generateAgendaTimeFormat
    },

    minTime: '00:00:00',
    maxTime: '24:00:00',
    slotEventOverlap: true
});

var AGENDA_ALL_DAY_EVENT_LIMIT = 5;


function generateAgendaAxisFormat(options, langData) {
    return langData.longDateFormat('LT')
        .replace(':mm', '(:mm)')
        .replace(/(\Wmm)$/, '($1)') // like above, but for foreign langs
        .replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
}


function generateAgendaTimeFormat(options, langData) {
    return langData.longDateFormat('LT')
        .replace(/\s*a$/i, ''); // remove trailing AM/PM
}


function AgendaView(calendar) {
    View.call(this, calendar); // call the super-constructor

    this.timeGrid = new TimeGrid(this);

    if (this.opt('allDaySlot')) { // should we display the "all-day" area?
        this.dayGrid = new DayGrid(this); // the all-day subcomponent of this view

        // the coordinate grid will be a combination of both subcomponents' grids
        this.coordMap = new ComboCoordMap([
            this.dayGrid.coordMap,
            this.timeGrid.coordMap
        ]);
    }
    else {
        this.coordMap = this.timeGrid.coordMap;
    }
}


AgendaView.prototype = createObject(View.prototype); // define the super-class
$.extend(AgendaView.prototype, {

    timeGrid: null, // the main time-grid subcomponent of this view
    dayGrid: null, // the "all-day" subcomponent. if all-day is turned off, this will be null

    axisWidth: null, // the width of the time axis running down the side

    noScrollRowEls: null, // set of fake row elements that must compensate when scrollerEl has scrollbars

    // when the time-grid isn't tall enough to occupy the given height, we render an <hr> underneath
    bottomRuleEl: null,
    bottomRuleHeight: null,


    /* Rendering
    ------------------------------------------------------------------------------------------------------------------*/


    // Renders the view into `this.el`, which has already been assigned.
    // `colCnt` has been calculated by a subclass and passed here.
    render: function(colCnt) {

        // needed for cell-to-date and date-to-cell calculations in View
        this.rowCnt = 1;
        this.colCnt = colCnt;

        this.el.addClass('fc-agenda-view').html(this.renderHtml());

        // the element that wraps the time-grid that will probably scroll
        this.scrollerEl = this.el.find('.fc-time-grid-container');
        this.timeGrid.coordMap.containerEl = this.scrollerEl; // don't accept clicks/etc outside of this

        this.timeGrid.el = this.el.find('.fc-time-grid');
        this.timeGrid.render();

        // the <hr> that sometimes displays under the time-grid
        this.bottomRuleEl = $('<hr class="' + this.widgetHeaderClass + '"/>')
            .appendTo(this.timeGrid.el); // inject it into the time-grid

        if (this.dayGrid) {
            this.dayGrid.el = this.el.find('.fc-day-grid');
            this.dayGrid.render();

            // have the day-grid extend it's coordinate area over the <hr> dividing the two grids
            this.dayGrid.bottomCoordPadding = this.dayGrid.el.next('hr').outerHeight();
        }

        this.noScrollRowEls = this.el.find('.fc-row:not(.fc-scroller *)'); // fake rows not within the scroller

        View.prototype.render.call(this); // call the super-method

        this.resetScroll(); // do this after sizes have been set
    },


    // Make subcomponents ready for cleanup
    destroy: function() {
        this.timeGrid.destroy();
        if (this.dayGrid) {
            this.dayGrid.destroy();
        }
        View.prototype.destroy.call(this); // call the super-method
    },


    // Builds the HTML skeleton for the view.
    // The day-grid and time-grid components will render inside containers defined by this HTML.
    renderHtml: function() {
        return '' +
            '<table>' +
                '<thead>' +
                    '<tr>' +
                        '<td class="' + this.widgetHeaderClass + '">' +
                            this.timeGrid.headHtml() + // render the day-of-week headers
                        '</td>' +
                    '</tr>' +
                '</thead>' +
                '<tbody>' +
                    '<tr>' +
                        '<td class="' + this.widgetContentClass + '">' +
                            (this.dayGrid ?
                                '<div class="fc-day-grid"/>' +
                                '<hr class="' + this.widgetHeaderClass + '"/>' :
                                ''
                                ) +
                            '<div class="fc-time-grid-container">' +
                                '<div class="fc-time-grid"/>' +
                            '</div>' +
                        '</td>' +
                    '</tr>' +
                '</tbody>' +
            '</table>';
    },


    // Generates the HTML that will go before the day-of week header cells.
    // Queried by the TimeGrid subcomponent when generating rows. Ordering depends on isRTL.
    headIntroHtml: function() {
        var date;
        var weekNumber;
        var weekTitle;
        var weekText;

        if (this.opt('weekNumbers')) {
            date = this.cellToDate(0, 0);
            weekNumber = this.calendar.calculateWeekNumber(date);
            weekTitle = this.opt('weekNumberTitle');

            if (this.opt('isRTL')) {
                weekText = weekNumber + weekTitle;
            }
            else {
                weekText = weekTitle + weekNumber;
            }

            return '' +
                '<th class="fc-axis fc-week-number ' + this.widgetHeaderClass + '" ' + this.axisStyleAttr() + '>' +
                    '<span>' + // needed for matchCellWidths
                        htmlEscape(weekText) +
                    '</span>' +
                '</th>';
        }
        else {
            return '<th class="fc-axis ' + this.widgetHeaderClass + '" ' + this.axisStyleAttr() + '></th>';
        }
    },


    // Generates the HTML that goes before the all-day cells.
    // Queried by the DayGrid subcomponent when generating rows. Ordering depends on isRTL.
    dayIntroHtml: function() {
        return '' +
            '<td class="fc-axis ' + this.widgetContentClass + '" ' + this.axisStyleAttr() + '>' +
                '<span>' + // needed for matchCellWidths
                    (this.opt('allDayHtml') || htmlEscape(this.opt('allDayText'))) +
                '</span>' +
            '</td>';
    },


    // Generates the HTML that goes before the bg of the TimeGrid slot area. Long vertical column.
    slotBgIntroHtml: function() {
        return '<td class="fc-axis ' + this.widgetContentClass + '" ' + this.axisStyleAttr() + '></td>';
    },


    // Generates the HTML that goes before all other types of cells.
    // Affects content-skeleton, helper-skeleton, highlight-skeleton for both the time-grid and day-grid.
    // Queried by the TimeGrid and DayGrid subcomponents when generating rows. Ordering depends on isRTL.
    introHtml: function() {
        return '<td class="fc-axis" ' + this.axisStyleAttr() + '></td>';
    },


    // Generates an HTML attribute string for setting the width of the axis, if it is known
    axisStyleAttr: function() {
        if (this.axisWidth !== null) {
             return 'style="width:' + this.axisWidth + 'px"';
        }
        return '';
    },


    /* Dimensions
    ------------------------------------------------------------------------------------------------------------------*/

    updateSize: function(isResize) {
        if (isResize) {
            this.timeGrid.resize();
        }
        View.prototype.updateSize.call(this, isResize);
    },


    // Refreshes the horizontal dimensions of the view
    updateWidth: function() {
        // make all axis cells line up, and record the width so newly created axis cells will have it
        this.axisWidth = matchCellWidths(this.el.find('.fc-axis'));
    },


    // Adjusts the vertical dimensions of the view to the specified values
    setHeight: function(totalHeight, isAuto) {
        var eventLimit;
        var scrollerHeight;

        if (this.bottomRuleHeight === null) {
            // calculate the height of the rule the very first time
            this.bottomRuleHeight = this.bottomRuleEl.outerHeight();
        }
        this.bottomRuleEl.hide(); // .show() will be called later if this <hr> is necessary

        // reset all dimensions back to the original state
        this.scrollerEl.css('overflow', '');
        unsetScroller(this.scrollerEl);
        uncompensateScroll(this.noScrollRowEls);

        // limit number of events in the all-day area
        if (this.dayGrid) {
            this.dayGrid.destroySegPopover(); // kill the "more" popover if displayed

            eventLimit = this.opt('eventLimit');
            if (eventLimit && typeof eventLimit !== 'number') {
                eventLimit = AGENDA_ALL_DAY_EVENT_LIMIT; // make sure "auto" goes to a real number
            }
            if (eventLimit) {
                this.dayGrid.limitRows(eventLimit);
            }
        }

        if (!isAuto) { // should we force dimensions of the scroll container, or let the contents be natural height?

            scrollerHeight = this.computeScrollerHeight(totalHeight);
            if (setPotentialScroller(this.scrollerEl, scrollerHeight)) { // using scrollbars?

                // make the all-day and header rows lines up
                compensateScroll(this.noScrollRowEls, getScrollbarWidths(this.scrollerEl));

                // the scrollbar compensation might have changed text flow, which might affect height, so recalculate
                // and reapply the desired height to the scroller.
                scrollerHeight = this.computeScrollerHeight(totalHeight);
                this.scrollerEl.height(scrollerHeight);

                this.restoreScroll();
            }
            else { // no scrollbars
                // still, force a height and display the bottom rule (marks the end of day)
                this.scrollerEl.height(scrollerHeight).css('overflow', 'hidden'); // in case <hr> goes outside
                this.bottomRuleEl.show();
            }
        }
    },


    // Sets the scroll value of the scroller to the intial pre-configured state prior to allowing the user to change it.
    resetScroll: function() {
        var _this = this;
        var scrollTime = moment.duration(this.opt('scrollTime'));
        var top = this.timeGrid.computeTimeTop(scrollTime);

        // zoom can give weird floating-point values. rather scroll a little bit further
        top = Math.ceil(top);

        if (top) {
            top++; // to overcome top border that slots beyond the first have. looks better
        }

        function scroll() {
            _this.scrollerEl.scrollTop(top);
        }

        scroll();
        setTimeout(scroll, 0); // overrides any previous scroll state made by the browser
    },


    /* Events
    ------------------------------------------------------------------------------------------------------------------*/


    // Renders events onto the view and populates the View's segment array
    renderEvents: function(events) {
        var dayEvents = [];
        var timedEvents = [];
        var daySegs = [];
        var timedSegs;
        var i;

        // separate the events into all-day and timed
        for (i = 0; i < events.length; i++) {
            if (events[i].allDay) {
                dayEvents.push(events[i]);
            }
            else {
                timedEvents.push(events[i]);
            }
        }

        // render the events in the subcomponents
        timedSegs = this.timeGrid.renderEvents(timedEvents);
        if (this.dayGrid) {
            daySegs = this.dayGrid.renderEvents(dayEvents);
        }

        // the all-day area is flexible and might have a lot of events, so shift the height
        this.updateHeight();

        View.prototype.renderEvents.call(this, events); // call the super-method
    },


    // Retrieves all segment objects that are rendered in the view
    getSegs: function() {
        return this.timeGrid.getSegs().concat(
            this.dayGrid ? this.dayGrid.getSegs() : []
        );
    },


    // Unrenders all event elements and clears internal segment data
    destroyEvents: function() {
        View.prototype.destroyEvents.call(this); // do this before the grids' segs have been cleared

        // if destroyEvents is being called as part of an event rerender, renderEvents will be called shortly
        // after, so remember what the scroll value was so we can restore it.
        this.recordScroll();

        // destroy the events in the subcomponents
        this.timeGrid.destroyEvents();
        if (this.dayGrid) {
            this.dayGrid.destroyEvents();
        }

        // we DON'T need to call updateHeight() because:
        // A) a renderEvents() call always happens after this, which will eventually call updateHeight()
        // B) in IE8, this causes a flash whenever events are rerendered
    },


    /* Event Dragging
    ------------------------------------------------------------------------------------------------------------------*/


    // Renders a visual indication of an event being dragged over the view.
    // A returned value of `true` signals that a mock "helper" event has been rendered.
    renderDrag: function(start, end, seg) {
        if (start.hasTime()) {
            return this.timeGrid.renderDrag(start, end, seg);
        }
        else if (this.dayGrid) {
            return this.dayGrid.renderDrag(start, end, seg);
        }
    },


    // Unrenders a visual indications of an event being dragged over the view
    destroyDrag: function() {
        this.timeGrid.destroyDrag();
        if (this.dayGrid) {
            this.dayGrid.destroyDrag();
        }
    },


    /* Selection
    ------------------------------------------------------------------------------------------------------------------*/


    // Renders a visual indication of a selection
    renderSelection: function(start, end) {
        if (start.hasTime() || end.hasTime()) {
            this.timeGrid.renderSelection(start, end);
        }
        else if (this.dayGrid) {
            this.dayGrid.renderSelection(start, end);
        }
    },


    // Unrenders a visual indications of a selection
    destroySelection: function() {
        this.timeGrid.destroySelection();
        if (this.dayGrid) {
            this.dayGrid.destroySelection();
        }
    }

});

;;

/* A week view with an all-day cell area at the top, and a time grid below
----------------------------------------------------------------------------------------------------------------------*/
// TODO: a WeekView mixin for calculating dates and titles

fcViews.agendaWeek = AgendaWeekView; // register the view

function AgendaWeekView(calendar) {
    AgendaView.call(this, calendar); // call the super-constructor
}


AgendaWeekView.prototype = createObject(AgendaView.prototype); // define the super-class
$.extend(AgendaWeekView.prototype, {

    name: 'agendaWeek',


    incrementDate: function(date, delta) {
        return date.clone().stripTime().add(delta, 'weeks').startOf('week');
    },


    render: function(date) {

        this.intervalStart = date.clone().stripTime().startOf('week');
        this.intervalEnd = this.intervalStart.clone().add(1, 'weeks');

        this.start = this.skipHiddenDays(this.intervalStart);
        this.end = this.skipHiddenDays(this.intervalEnd, -1, true);

        this.title = this.calendar.formatRange(
            this.start,
            this.end.clone().subtract(1), // make inclusive by subtracting 1 ms
            this.opt('titleFormat'),
            ' \u2014 ' // emphasized dash
        );

        AgendaView.prototype.render.call(this, this.getCellsPerWeek()); // call the super-method
    }

});

;;

/* A day view with an all-day cell area at the top, and a time grid below
----------------------------------------------------------------------------------------------------------------------*/

fcViews.agendaDay = AgendaDayView; // register the view

function AgendaDayView(calendar) {
    AgendaView.call(this, calendar); // call the super-constructor
}


AgendaDayView.prototype = createObject(AgendaView.prototype); // define the super-class
$.extend(AgendaDayView.prototype, {

    name: 'agendaDay',


    incrementDate: function(date, delta) {
        var out = date.clone().stripTime().add(delta, 'days');
        out = this.skipHiddenDays(out, delta < 0 ? -1 : 1);
        return out;
    },


    render: function(date) {

        this.start = this.intervalStart = date.clone().stripTime();
        this.end = this.intervalEnd = this.start.clone().add(1, 'days');

        this.title = this.calendar.formatDate(this.start, this.opt('titleFormat'));

        AgendaView.prototype.render.call(this, 1); // call the super-method
    }

});

;;

});