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Edit File : revisions.js \| Size : 33.13 KB
/** * @file Revisions interface functions, Backbone classes and * the revisions.php document.ready bootstrap. * * @output wp-admin/js/revisions.js / / global isRtl / window.wp = window.wp \|\| {}; (function($) { var revisions; /* * Expose the module in window.wp.revisions. / revisions = wp.revisions = { model: {}, view: {}, controller: {} }; // Link post revisions data served from the back end. revisions.settings = window._wpRevisionsSettings \|\| {}; // For debugging. revisions.debug = false; /* * wp.revisions.log * * A debugging utility for revisions. Works only when a * debug flag is on and the browser supports it. / revisions.log = function() { if ( window.console && revisions.debug ) { window.console.log.apply( window.console, arguments ); } }; // Handy functions to help with positioning. $.fn.allOffsets = function() { var offset = this.offset() \|\| {top: 0, left: 0}, win = $(window); return _.extend( offset, { right: win.width() - offset.left - this.outerWidth(), bottom: win.height() - offset.top - this.outerHeight() }); }; $.fn.allPositions = function() { var position = this.position() \|\| {top: 0, left: 0}, parent = this.parent(); return _.extend( position, { right: parent.outerWidth() - position.left - this.outerWidth(), bottom: parent.outerHeight() - position.top - this.outerHeight() }); }; /* * ======================================================================== * MODELS * ======================================================================== / revisions.model.Slider = Backbone.Model.extend({ defaults: { value: null, values: null, min: 0, max: 1, step: 1, range: false, compareTwoMode: false }, initialize: function( options ) { this.frame = options.frame; this.revisions = options.revisions; // Listen for changes to the revisions or mode from outside. this.listenTo( this.frame, 'update:revisions', this.receiveRevisions ); this.listenTo( this.frame, 'change:compareTwoMode', this.updateMode ); // Listen for internal changes. this.on( 'change:from', this.handleLocalChanges ); this.on( 'change:to', this.handleLocalChanges ); this.on( 'change:compareTwoMode', this.updateSliderSettings ); this.on( 'update:revisions', this.updateSliderSettings ); // Listen for changes to the hovered revision. this.on( 'change:hoveredRevision', this.hoverRevision ); this.set({ max: this.revisions.length - 1, compareTwoMode: this.frame.get('compareTwoMode'), from: this.frame.get('from'), to: this.frame.get('to') }); this.updateSliderSettings(); }, getSliderValue: function( a, b ) { return isRtl ? this.revisions.length - this.revisions.indexOf( this.get(a) ) - 1 : this.revisions.indexOf( this.get(b) ); }, updateSliderSettings: function() { if ( this.get('compareTwoMode') ) { this.set({ values: [ this.getSliderValue( 'to', 'from' ), this.getSliderValue( 'from', 'to' ) ], value: null, range: true // Ensures handles cannot cross. }); } else { this.set({ value: this.getSliderValue( 'to', 'to' ), values: null, range: false }); } this.trigger( 'update:slider' ); }, // Called when a revision is hovered. hoverRevision: function( model, value ) { this.trigger( 'hovered:revision', value ); }, // Called when `compareTwoMode` changes. updateMode: function( model, value ) { this.set({ compareTwoMode: value }); }, // Called when `from` or `to` changes in the local model. handleLocalChanges: function() { this.frame.set({ from: this.get('from'), to: this.get('to') }); }, // Receives revisions changes from outside the model. receiveRevisions: function( from, to ) { // Bail if nothing changed. if ( this.get('from') === from && this.get('to') === to ) { return; } this.set({ from: from, to: to }, { silent: true }); this.trigger( 'update:revisions', from, to ); } }); revisions.model.Tooltip = Backbone.Model.extend({ defaults: { revision: null, offset: {}, hovering: false, // Whether the mouse is hovering. scrubbing: false // Whether the mouse is scrubbing. }, initialize: function( options ) { this.frame = options.frame; this.revisions = options.revisions; this.slider = options.slider; this.listenTo( this.slider, 'hovered:revision', this.updateRevision ); this.listenTo( this.slider, 'change:hovering', this.setHovering ); this.listenTo( this.slider, 'change:scrubbing', this.setScrubbing ); }, updateRevision: function( revision ) { this.set({ revision: revision }); }, setHovering: function( model, value ) { this.set({ hovering: value }); }, setScrubbing: function( model, value ) { this.set({ scrubbing: value }); } }); revisions.model.Revision = Backbone.Model.extend({}); /* * wp.revisions.model.Revisions * * A collection of post revisions. / revisions.model.Revisions = Backbone.Collection.extend({ model: revisions.model.Revision, initialize: function() { _.bindAll( this, 'next', 'prev' ); }, next: function( revision ) { var index = this.indexOf( revision ); if ( index !== -1 && index !== this.length - 1 ) { return this.at( index + 1 ); } }, prev: function( revision ) { var index = this.indexOf( revision ); if ( index !== -1 && index !== 0 ) { return this.at( index - 1 ); } } }); revisions.model.Field = Backbone.Model.extend({}); revisions.model.Fields = Backbone.Collection.extend({ model: revisions.model.Field }); revisions.model.Diff = Backbone.Model.extend({ initialize: function() { var fields = this.get('fields'); this.unset('fields'); this.fields = new revisions.model.Fields( fields ); } }); revisions.model.Diffs = Backbone.Collection.extend({ initialize: function( models, options ) { _.bindAll( this, 'getClosestUnloaded' ); this.loadAll = _.once( this._loadAll ); this.revisions = options.revisions; this.postId = options.postId; this.requests = {}; }, model: revisions.model.Diff, ensure: function( id, context ) { var diff = this.get( id ), request = this.requests[ id ], deferred = $.Deferred(), ids = {}, from = id.split(':')[0], to = id.split(':')[1]; ids[id] = true; wp.revisions.log( 'ensure', id ); this.trigger( 'ensure', ids, from, to, deferred.promise() ); if ( diff ) { deferred.resolveWith( context, [ diff ] ); } else { this.trigger( 'ensure:load', ids, from, to, deferred.promise() ); _.each( ids, _.bind( function( id ) { // Remove anything that has an ongoing request. if ( this.requests[ id ] ) { delete ids[ id ]; } // Remove anything we already have. if ( this.get( id ) ) { delete ids[ id ]; } }, this ) ); if ( ! request ) { // Always include the ID that started this ensure. ids[ id ] = true; request = this.load( _.keys( ids ) ); } request.done( _.bind( function() { deferred.resolveWith( context, [ this.get( id ) ] ); }, this ) ).fail( _.bind( function() { deferred.reject(); }) ); } return deferred.promise(); }, // Returns an array of proximal diffs. getClosestUnloaded: function( ids, centerId ) { var self = this; return _.chain([0].concat( ids )).initial().zip( ids ).sortBy( function( pair ) { return Math.abs( centerId - pair[1] ); }).map( function( pair ) { return pair.join(':'); }).filter( function( diffId ) { return _.isUndefined( self.get( diffId ) ) && ! self.requests[ diffId ]; }).value(); }, _loadAll: function( allRevisionIds, centerId, num ) { var self = this, deferred = $.Deferred(), diffs = _.first( this.getClosestUnloaded( allRevisionIds, centerId ), num ); if ( _.size( diffs ) > 0 ) { this.load( diffs ).done( function() { self._loadAll( allRevisionIds, centerId, num ).done( function() { deferred.resolve(); }); }).fail( function() { if ( 1 === num ) { // Already tried 1. This just isn't working. Give up. deferred.reject(); } else { // Request fewer diffs this time. self._loadAll( allRevisionIds, centerId, Math.ceil( num / 2 ) ).done( function() { deferred.resolve(); }); } }); } else { deferred.resolve(); } return deferred; }, load: function( comparisons ) { wp.revisions.log( 'load', comparisons ); // Our collection should only ever grow, never shrink, so `remove: false`. return this.fetch({ data: { compare: comparisons }, remove: false }).done( function() { wp.revisions.log( 'load:complete', comparisons ); }); }, sync: function( method, model, options ) { if ( 'read' === method ) { options = options \|\| {}; options.context = this; options.data = _.extend( options.data \|\| {}, { action: 'get-revision-diffs', post_id: this.postId }); var deferred = wp.ajax.send( options ), requests = this.requests; // Record that we're requesting each diff. if ( options.data.compare ) { _.each( options.data.compare, function( id ) { requests[ id ] = deferred; }); } // When the request completes, clear the stored request. deferred.always( function() { if ( options.data.compare ) { _.each( options.data.compare, function( id ) { delete requests[ id ]; }); } }); return deferred; // Otherwise, fall back to `Backbone.sync()`. } else { return Backbone.Model.prototype.sync.apply( this, arguments ); } } }); /* * wp.revisions.model.FrameState * * The frame state. * * @see wp.revisions.view.Frame * * @param {object} attributes Model attributes - none are required. * @param {object} options Options for the model. * @param {revisions.model.Revisions} options.revisions A collection of revisions. / revisions.model.FrameState = Backbone.Model.extend({ defaults: { loading: false, error: false, compareTwoMode: false }, initialize: function( attributes, options ) { var state = this.get( 'initialDiffState' ); _.bindAll( this, 'receiveDiff' ); this._debouncedEnsureDiff = _.debounce( this._ensureDiff, 200 ); this.revisions = options.revisions; this.diffs = new revisions.model.Diffs( [], { revisions: this.revisions, postId: this.get( 'postId' ) } ); // Set the initial diffs collection. this.diffs.set( this.get( 'diffData' ) ); // Set up internal listeners. this.listenTo( this, 'change:from', this.changeRevisionHandler ); this.listenTo( this, 'change:to', this.changeRevisionHandler ); this.listenTo( this, 'change:compareTwoMode', this.changeMode ); this.listenTo( this, 'update:revisions', this.updatedRevisions ); this.listenTo( this.diffs, 'ensure:load', this.updateLoadingStatus ); this.listenTo( this, 'update:diff', this.updateLoadingStatus ); // Set the initial revisions, baseUrl, and mode as provided through attributes. this.set( { to : this.revisions.get( state.to ), from : this.revisions.get( state.from ), compareTwoMode : state.compareTwoMode } ); // Start the router if browser supports History API. if ( window.history && window.history.pushState ) { this.router = new revisions.Router({ model: this }); if ( Backbone.History.started ) { Backbone.history.stop(); } Backbone.history.start({ pushState: true }); } }, updateLoadingStatus: function() { this.set( 'error', false ); this.set( 'loading', ! this.diff() ); }, changeMode: function( model, value ) { var toIndex = this.revisions.indexOf( this.get( 'to' ) ); // If we were on the first revision before switching to two-handled mode, // bump the 'to' position over one. if ( value && 0 === toIndex ) { this.set({ from: this.revisions.at( toIndex ), to: this.revisions.at( toIndex + 1 ) }); } // When switching back to single-handled mode, reset 'from' model to // one position before the 'to' model. if ( ! value && 0 !== toIndex ) { // '! value' means switching to single-handled mode. this.set({ from: this.revisions.at( toIndex - 1 ), to: this.revisions.at( toIndex ) }); } }, updatedRevisions: function( from, to ) { if ( this.get( 'compareTwoMode' ) ) { // @todo Compare-two loading strategy. } else { this.diffs.loadAll( this.revisions.pluck('id'), to.id, 40 ); } }, // Fetch the currently loaded diff. diff: function() { return this.diffs.get( this._diffId ); }, / * So long as `from` and `to` are changed at the same time, the diff * will only be updated once. This is because Backbone updates all of * the changed attributes in `set`, and then fires the `change` events. / updateDiff: function( options ) { var from, to, diffId, diff; options = options \|\| {}; from = this.get('from'); to = this.get('to'); diffId = ( from ? from.id : 0 ) + ':' + to.id; // Check if we're actually changing the diff id. if ( this._diffId === diffId ) { return $.Deferred().reject().promise(); } this._diffId = diffId; this.trigger( 'update:revisions', from, to ); diff = this.diffs.get( diffId ); // If we already have the diff, then immediately trigger the update. if ( diff ) { this.receiveDiff( diff ); return $.Deferred().resolve().promise(); // Otherwise, fetch the diff. } else { if ( options.immediate ) { return this._ensureDiff(); } else { this._debouncedEnsureDiff(); return $.Deferred().reject().promise(); } } }, // A simple wrapper around `updateDiff` to prevent the change event's // parameters from being passed through. changeRevisionHandler: function() { this.updateDiff(); }, receiveDiff: function( diff ) { // Did we actually get a diff? if ( _.isUndefined( diff ) \|\| _.isUndefined( diff.id ) ) { this.set({ loading: false, error: true }); } else if ( this._diffId === diff.id ) { // Make sure the current diff didn't change. this.trigger( 'update:diff', diff ); } }, _ensureDiff: function() { return this.diffs.ensure( this._diffId, this ).always( this.receiveDiff ); } }); /* * ======================================================================== * VIEWS * ======================================================================== / /* * wp.revisions.view.Frame * * Top level frame that orchestrates the revisions experience. * * @param {object} options The options hash for the view. * @param {revisions.model.FrameState} options.model The frame state model. / revisions.view.Frame = wp.Backbone.View.extend({ className: 'revisions', template: wp.template('revisions-frame'), initialize: function() { this.listenTo( this.model, 'update:diff', this.renderDiff ); this.listenTo( this.model, 'change:compareTwoMode', this.updateCompareTwoMode ); this.listenTo( this.model, 'change:loading', this.updateLoadingStatus ); this.listenTo( this.model, 'change:error', this.updateErrorStatus ); this.views.set( '.revisions-control-frame', new revisions.view.Controls({ model: this.model }) ); }, render: function() { wp.Backbone.View.prototype.render.apply( this, arguments ); $('html').css( 'overflow-y', 'scroll' ); $('#wpbody-content .wrap').append( this.el ); this.updateCompareTwoMode(); this.renderDiff( this.model.diff() ); this.views.ready(); return this; }, renderDiff: function( diff ) { this.views.set( '.revisions-diff-frame', new revisions.view.Diff({ model: diff }) ); }, updateLoadingStatus: function() { this.$el.toggleClass( 'loading', this.model.get('loading') ); }, updateErrorStatus: function() { this.$el.toggleClass( 'diff-error', this.model.get('error') ); }, updateCompareTwoMode: function() { this.$el.toggleClass( 'comparing-two-revisions', this.model.get('compareTwoMode') ); } }); /* * wp.revisions.view.Controls * * The controls view. * * Contains the revision slider, previous/next buttons, the meta info and the compare checkbox. / revisions.view.Controls = wp.Backbone.View.extend({ className: 'revisions-controls', initialize: function() { _.bindAll( this, 'setWidth' ); // Add the button view. this.views.add( new revisions.view.Buttons({ model: this.model }) ); // Add the checkbox view. this.views.add( new revisions.view.Checkbox({ model: this.model }) ); // Prep the slider model. var slider = new revisions.model.Slider({ frame: this.model, revisions: this.model.revisions }), // Prep the tooltip model. tooltip = new revisions.model.Tooltip({ frame: this.model, revisions: this.model.revisions, slider: slider }); // Add the tooltip view. this.views.add( new revisions.view.Tooltip({ model: tooltip }) ); // Add the tickmarks view. this.views.add( new revisions.view.Tickmarks({ model: tooltip }) ); // Add the slider view. this.views.add( new revisions.view.Slider({ model: slider }) ); // Add the Metabox view. this.views.add( new revisions.view.Metabox({ model: this.model }) ); }, ready: function() { this.top = this.$el.offset().top; this.window = $(window); this.window.on( 'scroll.wp.revisions', {controls: this}, function(e) { var controls = e.data.controls, container = controls.$el.parent(), scrolled = controls.window.scrollTop(), frame = controls.views.parent; if ( scrolled >= controls.top ) { if ( ! frame.$el.hasClass('pinned') ) { controls.setWidth(); container.css('height', container.height() + 'px' ); controls.window.on('resize.wp.revisions.pinning click.wp.revisions.pinning', {controls: controls}, function(e) { e.data.controls.setWidth(); }); } frame.$el.addClass('pinned'); } else if ( frame.$el.hasClass('pinned') ) { controls.window.off('.wp.revisions.pinning'); controls.$el.css('width', 'auto'); frame.$el.removeClass('pinned'); container.css('height', 'auto'); controls.top = controls.$el.offset().top; } else { controls.top = controls.$el.offset().top; } }); }, setWidth: function() { this.$el.css('width', this.$el.parent().width() + 'px'); } }); // The tickmarks view. revisions.view.Tickmarks = wp.Backbone.View.extend({ className: 'revisions-tickmarks', direction: isRtl ? 'right' : 'left', initialize: function() { this.listenTo( this.model, 'change:revision', this.reportTickPosition ); }, reportTickPosition: function( model, revision ) { var offset, thisOffset, parentOffset, tick, index = this.model.revisions.indexOf( revision ); thisOffset = this.$el.allOffsets(); parentOffset = this.$el.parent().allOffsets(); if ( index === this.model.revisions.length - 1 ) { // Last one. offset = { rightPlusWidth: thisOffset.left - parentOffset.left + 1, leftPlusWidth: thisOffset.right - parentOffset.right + 1 }; } else { // Normal tick. tick = this.$('div:nth-of-type(' + (index + 1) + ')'); offset = tick.allPositions(); _.extend( offset, { left: offset.left + thisOffset.left - parentOffset.left, right: offset.right + thisOffset.right - parentOffset.right }); _.extend( offset, { leftPlusWidth: offset.left + tick.outerWidth(), rightPlusWidth: offset.right + tick.outerWidth() }); } this.model.set({ offset: offset }); }, ready: function() { var tickCount, tickWidth; tickCount = this.model.revisions.length - 1; tickWidth = 1 / tickCount; this.$el.css('width', ( this.model.revisions.length 50 ) + 'px'); _(tickCount).times( function( index ){ this.$el.append( '<div style="' + this.direction + ': ' + ( 100 * tickWidth * index ) + '%"></div>' ); }, this ); } }); // The metabox view. revisions.view.Metabox = wp.Backbone.View.extend({ className: 'revisions-meta', initialize: function() { // Add the 'from' view. this.views.add( new revisions.view.MetaFrom({ model: this.model, className: 'diff-meta diff-meta-from' }) ); // Add the 'to' view. this.views.add( new revisions.view.MetaTo({ model: this.model }) ); } }); // The revision meta view (to be extended). revisions.view.Meta = wp.Backbone.View.extend({ template: wp.template('revisions-meta'), events: { 'click .restore-revision': 'restoreRevision' }, initialize: function() { this.listenTo( this.model, 'update:revisions', this.render ); }, prepare: function() { return _.extend( this.model.toJSON()[this.type] \|\| {}, { type: this.type }); }, restoreRevision: function() { document.location = this.model.get('to').attributes.restoreUrl; } }); // The revision meta 'from' view. revisions.view.MetaFrom = revisions.view.Meta.extend({ className: 'diff-meta diff-meta-from', type: 'from' }); // The revision meta 'to' view. revisions.view.MetaTo = revisions.view.Meta.extend({ className: 'diff-meta diff-meta-to', type: 'to' }); // The checkbox view. revisions.view.Checkbox = wp.Backbone.View.extend({ className: 'revisions-checkbox', template: wp.template('revisions-checkbox'), events: { 'click .compare-two-revisions': 'compareTwoToggle' }, initialize: function() { this.listenTo( this.model, 'change:compareTwoMode', this.updateCompareTwoMode ); }, ready: function() { if ( this.model.revisions.length < 3 ) { $('.revision-toggle-compare-mode').hide(); } }, updateCompareTwoMode: function() { this.$('.compare-two-revisions').prop( 'checked', this.model.get('compareTwoMode') ); }, // Toggle the compare two mode feature when the compare two checkbox is checked. compareTwoToggle: function() { // Activate compare two mode? this.model.set({ compareTwoMode: $('.compare-two-revisions').prop('checked') }); } }); // The tooltip view. // Encapsulates the tooltip. revisions.view.Tooltip = wp.Backbone.View.extend({ className: 'revisions-tooltip', template: wp.template('revisions-meta'), initialize: function() { this.listenTo( this.model, 'change:offset', this.render ); this.listenTo( this.model, 'change:hovering', this.toggleVisibility ); this.listenTo( this.model, 'change:scrubbing', this.toggleVisibility ); }, prepare: function() { if ( _.isNull( this.model.get('revision') ) ) { return; } else { return _.extend( { type: 'tooltip' }, { attributes: this.model.get('revision').toJSON() }); } }, render: function() { var otherDirection, direction, directionVal, flipped, css = {}, position = this.model.revisions.indexOf( this.model.get('revision') ) + 1; flipped = ( position / this.model.revisions.length ) > 0.5; if ( isRtl ) { direction = flipped ? 'left' : 'right'; directionVal = flipped ? 'leftPlusWidth' : direction; } else { direction = flipped ? 'right' : 'left'; directionVal = flipped ? 'rightPlusWidth' : direction; } otherDirection = 'right' === direction ? 'left': 'right'; wp.Backbone.View.prototype.render.apply( this, arguments ); css[direction] = this.model.get('offset')[directionVal] + 'px'; css[otherDirection] = ''; this.$el.toggleClass( 'flipped', flipped ).css( css ); }, visible: function() { return this.model.get( 'scrubbing' ) \|\| this.model.get( 'hovering' ); }, toggleVisibility: function() { if ( this.visible() ) { this.$el.stop().show().fadeTo( 100 - this.el.style.opacity * 100, 1 ); } else { this.$el.stop().fadeTo( this.el.style.opacity * 300, 0, function(){ $(this).hide(); } ); } return; } }); // The buttons view. // Encapsulates all of the configuration for the previous/next buttons. revisions.view.Buttons = wp.Backbone.View.extend({ className: 'revisions-buttons', template: wp.template('revisions-buttons'), events: { 'click .revisions-next .button': 'nextRevision', 'click .revisions-previous .button': 'previousRevision' }, initialize: function() { this.listenTo( this.model, 'update:revisions', this.disabledButtonCheck ); }, ready: function() { this.disabledButtonCheck(); }, // Go to a specific model index. gotoModel: function( toIndex ) { var attributes = { to: this.model.revisions.at( toIndex ) }; // If we're at the first revision, unset 'from'. if ( toIndex ) { attributes.from = this.model.revisions.at( toIndex - 1 ); } else { this.model.unset('from', { silent: true }); } this.model.set( attributes ); }, // Go to the 'next' revision. nextRevision: function() { var toIndex = this.model.revisions.indexOf( this.model.get('to') ) + 1; this.gotoModel( toIndex ); }, // Go to the 'previous' revision. previousRevision: function() { var toIndex = this.model.revisions.indexOf( this.model.get('to') ) - 1; this.gotoModel( toIndex ); }, // Check to see if the Previous or Next buttons need to be disabled or enabled. disabledButtonCheck: function() { var maxVal = this.model.revisions.length - 1, minVal = 0, next = $('.revisions-next .button'), previous = $('.revisions-previous .button'), val = this.model.revisions.indexOf( this.model.get('to') ); // Disable "Next" button if you're on the last node. next.prop( 'disabled', ( maxVal === val ) ); // Disable "Previous" button if you're on the first node. previous.prop( 'disabled', ( minVal === val ) ); } }); // The slider view. revisions.view.Slider = wp.Backbone.View.extend({ className: 'wp-slider', direction: isRtl ? 'right' : 'left', events: { 'mousemove' : 'mouseMove' }, initialize: function() { _.bindAll( this, 'start', 'slide', 'stop', 'mouseMove', 'mouseEnter', 'mouseLeave' ); this.listenTo( this.model, 'update:slider', this.applySliderSettings ); }, ready: function() { this.$el.css('width', ( this.model.revisions.length * 50 ) + 'px'); this.$el.slider( _.extend( this.model.toJSON(), { start: this.start, slide: this.slide, stop: this.stop }) ); this.$el.hoverIntent({ over: this.mouseEnter, out: this.mouseLeave, timeout: 800 }); this.applySliderSettings(); }, mouseMove: function( e ) { var zoneCount = this.model.revisions.length - 1, // One fewer zone than models. sliderFrom = this.$el.allOffsets()[this.direction], // "From" edge of slider. sliderWidth = this.$el.width(), // Width of slider. tickWidth = sliderWidth / zoneCount, // Calculated width of zone. actualX = ( isRtl ? $(window).width() - e.pageX : e.pageX ) - sliderFrom, // Flipped for RTL - sliderFrom. currentModelIndex = Math.floor( ( actualX + ( tickWidth / 2 ) ) / tickWidth ); // Calculate the model index. // Ensure sane value for currentModelIndex. if ( currentModelIndex < 0 ) { currentModelIndex = 0; } else if ( currentModelIndex >= this.model.revisions.length ) { currentModelIndex = this.model.revisions.length - 1; } // Update the tooltip mode. this.model.set({ hoveredRevision: this.model.revisions.at( currentModelIndex ) }); }, mouseLeave: function() { this.model.set({ hovering: false }); }, mouseEnter: function() { this.model.set({ hovering: true }); }, applySliderSettings: function() { this.$el.slider( _.pick( this.model.toJSON(), 'value', 'values', 'range' ) ); var handles = this.$('a.ui-slider-handle'); if ( this.model.get('compareTwoMode') ) { // In RTL mode the 'left handle' is the second in the slider, 'right' is first. handles.first() .toggleClass( 'to-handle', !! isRtl ) .toggleClass( 'from-handle', ! isRtl ); handles.last() .toggleClass( 'from-handle', !! isRtl ) .toggleClass( 'to-handle', ! isRtl ); } else { handles.removeClass('from-handle to-handle'); } }, start: function( event, ui ) { this.model.set({ scrubbing: true }); // Track the mouse position to enable smooth dragging, // overrides default jQuery UI step behavior. $( window ).on( 'mousemove.wp.revisions', { view: this }, function( e ) { var handles, view = e.data.view, leftDragBoundary = view.$el.offset().left, sliderOffset = leftDragBoundary, sliderRightEdge = leftDragBoundary + view.$el.width(), rightDragBoundary = sliderRightEdge, leftDragReset = '0', rightDragReset = '100%', handle = $( ui.handle ); // In two handle mode, ensure handles can't be dragged past each other. // Adjust left/right boundaries and reset points. if ( view.model.get('compareTwoMode') ) { handles = handle.parent().find('.ui-slider-handle'); if ( handle.is( handles.first() ) ) { // We're the left handle. rightDragBoundary = handles.last().offset().left; rightDragReset = rightDragBoundary - sliderOffset; } else { // We're the right handle. leftDragBoundary = handles.first().offset().left + handles.first().width(); leftDragReset = leftDragBoundary - sliderOffset; } } // Follow mouse movements, as long as handle remains inside slider. if ( e.pageX < leftDragBoundary ) { handle.css( 'left', leftDragReset ); // Mouse to left of slider. } else if ( e.pageX > rightDragBoundary ) { handle.css( 'left', rightDragReset ); // Mouse to right of slider. } else { handle.css( 'left', e.pageX - sliderOffset ); // Mouse in slider. } } ); }, getPosition: function( position ) { return isRtl ? this.model.revisions.length - position - 1: position; }, // Responds to slide events. slide: function( event, ui ) { var attributes, movedRevision; // Compare two revisions mode. if ( this.model.get('compareTwoMode') ) { // Prevent sliders from occupying same spot. if ( ui.values[1] === ui.values[0] ) { return false; } if ( isRtl ) { ui.values.reverse(); } attributes = { from: this.model.revisions.at( this.getPosition( ui.values[0] ) ), to: this.model.revisions.at( this.getPosition( ui.values[1] ) ) }; } else { attributes = { to: this.model.revisions.at( this.getPosition( ui.value ) ) }; // If we're at the first revision, unset 'from'. if ( this.getPosition( ui.value ) > 0 ) { attributes.from = this.model.revisions.at( this.getPosition( ui.value ) - 1 ); } else { attributes.from = undefined; } } movedRevision = this.model.revisions.at( this.getPosition( ui.value ) ); // If we are scrubbing, a scrub to a revision is considered a hover. if ( this.model.get('scrubbing') ) { attributes.hoveredRevision = movedRevision; } this.model.set( attributes ); }, stop: function() { $( window ).off('mousemove.wp.revisions'); this.model.updateSliderSettings(); // To snap us back to a tick mark. this.model.set({ scrubbing: false }); } }); // The diff view. // This is the view for the current active diff. revisions.view.Diff = wp.Backbone.View.extend({ className: 'revisions-diff', template: wp.template('revisions-diff'), // Generate the options to be passed to the template. prepare: function() { return _.extend({ fields: this.model.fields.toJSON() }, this.options ); } }); // The revisions router. // Maintains the URL routes so browser URL matches state. revisions.Router = Backbone.Router.extend({ initialize: function( options ) { this.model = options.model; // Maintain state and history when navigating. this.listenTo( this.model, 'update:diff', _.debounce( this.updateUrl, 250 ) ); this.listenTo( this.model, 'change:compareTwoMode', this.updateUrl ); }, baseUrl: function( url ) { return this.model.get('baseUrl') + url; }, updateUrl: function() { var from = this.model.has('from') ? this.model.get('from').id : 0, to = this.model.get('to').id; if ( this.model.get('compareTwoMode' ) ) { this.navigate( this.baseUrl( '?from=' + from + '&to=' + to ), { replace: true } ); } else { this.navigate( this.baseUrl( '?revision=' + to ), { replace: true } ); } }, handleRoute: function( a, b ) { var compareTwo = _.isUndefined( b ); if ( ! compareTwo ) { b = this.model.revisions.get( a ); a = this.model.revisions.prev( b ); b = b ? b.id : 0; a = a ? a.id : 0; } } }); /** * Initialize the revisions UI for revision.php. */ revisions.init = function() { var state; // Bail if the current page is not revision.php. if ( ! window.adminpage \|\| 'revision-php' !== window.adminpage ) { return; } state = new revisions.model.FrameState({ initialDiffState: { // wp_localize_script doesn't stringifies ints, so cast them. to: parseInt( revisions.settings.to, 10 ), from: parseInt( revisions.settings.from, 10 ), // wp_localize_script does not allow for top-level booleans so do a comparator here. compareTwoMode: ( revisions.settings.compareTwoMode === '1' ) }, diffData: revisions.settings.diffData, baseUrl: revisions.settings.baseUrl, postId: parseInt( revisions.settings.postId, 10 ) }, { revisions: new revisions.model.Revisions( revisions.settings.revisionData ) }); revisions.view.frame = new revisions.view.Frame({ model: state }).render(); }; $( revisions.init ); }(jQuery)); Back

Edit File : revisions.js | Size : 33.13 KB

/**
 * @file Revisions interface functions, Backbone classes and
 * the revisions.php document.ready bootstrap.
 *
 * @output wp-admin/js/revisions.js
 */

/* global isRtl */

window.wp = window.wp || {};

(function($) {
	var revisions;
	/**
	 * Expose the module in window.wp.revisions.
	 */
	revisions = wp.revisions = { model: {}, view: {}, controller: {} };

// Link post revisions data served from the back end.
	revisions.settings = window._wpRevisionsSettings || {};

// For debugging.
	revisions.debug = false;

/**
	 * wp.revisions.log
	 *
	 * A debugging utility for revisions. Works only when a
	 * debug flag is on and the browser supports it.
	 */
	revisions.log = function() {
		if ( window.console && revisions.debug ) {
			window.console.log.apply( window.console, arguments );
		}
	};

// Handy functions to help with positioning.
	$.fn.allOffsets = function() {
		var offset = this.offset() || {top: 0, left: 0}, win = $(window);
		return _.extend( offset, {
			right:  win.width()  - offset.left - this.outerWidth(),
			bottom: win.height() - offset.top  - this.outerHeight()
		});
	};

$.fn.allPositions = function() {
		var position = this.position() || {top: 0, left: 0}, parent = this.parent();
		return _.extend( position, {
			right:  parent.outerWidth()  - position.left - this.outerWidth(),
			bottom: parent.outerHeight() - position.top  - this.outerHeight()
		});
	};

/**
	 * ========================================================================
	 * MODELS
	 * ========================================================================
	 */
	revisions.model.Slider = Backbone.Model.extend({
		defaults: {
			value: null,
			values: null,
			min: 0,
			max: 1,
			step: 1,
			range: false,
			compareTwoMode: false
		},

initialize: function( options ) {
			this.frame = options.frame;
			this.revisions = options.revisions;

// Listen for changes to the revisions or mode from outside.
			this.listenTo( this.frame, 'update:revisions', this.receiveRevisions );
			this.listenTo( this.frame, 'change:compareTwoMode', this.updateMode );

// Listen for internal changes.
			this.on( 'change:from', this.handleLocalChanges );
			this.on( 'change:to', this.handleLocalChanges );
			this.on( 'change:compareTwoMode', this.updateSliderSettings );
			this.on( 'update:revisions', this.updateSliderSettings );

// Listen for changes to the hovered revision.
			this.on( 'change:hoveredRevision', this.hoverRevision );

this.set({
				max:   this.revisions.length - 1,
				compareTwoMode: this.frame.get('compareTwoMode'),
				from: this.frame.get('from'),
				to: this.frame.get('to')
			});
			this.updateSliderSettings();
		},

getSliderValue: function( a, b ) {
			return isRtl ? this.revisions.length - this.revisions.indexOf( this.get(a) ) - 1 : this.revisions.indexOf( this.get(b) );
		},

updateSliderSettings: function() {
			if ( this.get('compareTwoMode') ) {
				this.set({
					values: [
						this.getSliderValue( 'to', 'from' ),
						this.getSliderValue( 'from', 'to' )
					],
					value: null,
					range: true // Ensures handles cannot cross.
				});
			} else {
				this.set({
					value: this.getSliderValue( 'to', 'to' ),
					values: null,
					range: false
				});
			}
			this.trigger( 'update:slider' );
		},

// Called when a revision is hovered.
		hoverRevision: function( model, value ) {
			this.trigger( 'hovered:revision', value );
		},

// Called when `compareTwoMode` changes.
		updateMode: function( model, value ) {
			this.set({ compareTwoMode: value });
		},

// Called when `from` or `to` changes in the local model.
		handleLocalChanges: function() {
			this.frame.set({
				from: this.get('from'),
				to: this.get('to')
			});
		},

// Receives revisions changes from outside the model.
		receiveRevisions: function( from, to ) {
			// Bail if nothing changed.
			if ( this.get('from') === from && this.get('to') === to ) {
				return;
			}

this.set({ from: from, to: to }, { silent: true });
			this.trigger( 'update:revisions', from, to );
		}

});

revisions.model.Tooltip = Backbone.Model.extend({
		defaults: {
			revision: null,
			offset: {},
			hovering: false, // Whether the mouse is hovering.
			scrubbing: false // Whether the mouse is scrubbing.
		},

initialize: function( options ) {
			this.frame = options.frame;
			this.revisions = options.revisions;
			this.slider = options.slider;

this.listenTo( this.slider, 'hovered:revision', this.updateRevision );
			this.listenTo( this.slider, 'change:hovering', this.setHovering );
			this.listenTo( this.slider, 'change:scrubbing', this.setScrubbing );
		},

updateRevision: function( revision ) {
			this.set({ revision: revision });
		},

setHovering: function( model, value ) {
			this.set({ hovering: value });
		},

setScrubbing: function( model, value ) {
			this.set({ scrubbing: value });
		}
	});

revisions.model.Revision = Backbone.Model.extend({});

/**
	 * wp.revisions.model.Revisions
	 *
	 * A collection of post revisions.
	 */
	revisions.model.Revisions = Backbone.Collection.extend({
		model: revisions.model.Revision,

initialize: function() {
			_.bindAll( this, 'next', 'prev' );
		},

next: function( revision ) {
			var index = this.indexOf( revision );

if ( index !== -1 && index !== this.length - 1 ) {
				return this.at( index + 1 );
			}
		},

prev: function( revision ) {
			var index = this.indexOf( revision );

if ( index !== -1 && index !== 0 ) {
				return this.at( index - 1 );
			}
		}
	});

revisions.model.Field = Backbone.Model.extend({});

revisions.model.Fields = Backbone.Collection.extend({
		model: revisions.model.Field
	});

revisions.model.Diff = Backbone.Model.extend({
		initialize: function() {
			var fields = this.get('fields');
			this.unset('fields');

this.fields = new revisions.model.Fields( fields );
		}
	});

revisions.model.Diffs = Backbone.Collection.extend({
		initialize: function( models, options ) {
			_.bindAll( this, 'getClosestUnloaded' );
			this.loadAll = _.once( this._loadAll );
			this.revisions = options.revisions;
			this.postId = options.postId;
			this.requests  = {};
		},

model: revisions.model.Diff,

ensure: function( id, context ) {
			var diff     = this.get( id ),
				request  = this.requests[ id ],
				deferred = $.Deferred(),
				ids      = {},
				from     = id.split(':')[0],
				to       = id.split(':')[1];
			ids[id] = true;

wp.revisions.log( 'ensure', id );

this.trigger( 'ensure', ids, from, to, deferred.promise() );

if ( diff ) {
				deferred.resolveWith( context, [ diff ] );
			} else {
				this.trigger( 'ensure:load', ids, from, to, deferred.promise() );
				_.each( ids, _.bind( function( id ) {
					// Remove anything that has an ongoing request.
					if ( this.requests[ id ] ) {
						delete ids[ id ];
					}
					// Remove anything we already have.
					if ( this.get( id ) ) {
						delete ids[ id ];
					}
				}, this ) );
				if ( ! request ) {
					// Always include the ID that started this ensure.
					ids[ id ] = true;
					request   = this.load( _.keys( ids ) );
				}

request.done( _.bind( function() {
					deferred.resolveWith( context, [ this.get( id ) ] );
				}, this ) ).fail( _.bind( function() {
					deferred.reject();
				}) );
			}

return deferred.promise();
		},

// Returns an array of proximal diffs.
		getClosestUnloaded: function( ids, centerId ) {
			var self = this;
			return _.chain([0].concat( ids )).initial().zip( ids ).sortBy( function( pair ) {
				return Math.abs( centerId - pair[1] );
			}).map( function( pair ) {
				return pair.join(':');
			}).filter( function( diffId ) {
				return _.isUndefined( self.get( diffId ) ) && ! self.requests[ diffId ];
			}).value();
		},

_loadAll: function( allRevisionIds, centerId, num ) {
			var self = this, deferred = $.Deferred(),
				diffs = _.first( this.getClosestUnloaded( allRevisionIds, centerId ), num );
			if ( _.size( diffs ) > 0 ) {
				this.load( diffs ).done( function() {
					self._loadAll( allRevisionIds, centerId, num ).done( function() {
						deferred.resolve();
					});
				}).fail( function() {
					if ( 1 === num ) { // Already tried 1. This just isn't working. Give up.
						deferred.reject();
					} else { // Request fewer diffs this time.
						self._loadAll( allRevisionIds, centerId, Math.ceil( num / 2 ) ).done( function() {
							deferred.resolve();
						});
					}
				});
			} else {
				deferred.resolve();
			}
			return deferred;
		},

load: function( comparisons ) {
			wp.revisions.log( 'load', comparisons );
			// Our collection should only ever grow, never shrink, so `remove: false`.
			return this.fetch({ data: { compare: comparisons }, remove: false }).done( function() {
				wp.revisions.log( 'load:complete', comparisons );
			});
		},

sync: function( method, model, options ) {
			if ( 'read' === method ) {
				options = options || {};
				options.context = this;
				options.data = _.extend( options.data || {}, {
					action: 'get-revision-diffs',
					post_id: this.postId
				});

var deferred = wp.ajax.send( options ),
					requests = this.requests;

// Record that we're requesting each diff.
				if ( options.data.compare ) {
					_.each( options.data.compare, function( id ) {
						requests[ id ] = deferred;
					});
				}

// When the request completes, clear the stored request.
				deferred.always( function() {
					if ( options.data.compare ) {
						_.each( options.data.compare, function( id ) {
							delete requests[ id ];
						});
					}
				});

return deferred;

// Otherwise, fall back to `Backbone.sync()`.
			} else {
				return Backbone.Model.prototype.sync.apply( this, arguments );
			}
		}
	});

/**
	 * wp.revisions.model.FrameState
	 *
	 * The frame state.
	 *
	 * @see wp.revisions.view.Frame
	 *
	 * @param {object}                    attributes        Model attributes - none are required.
	 * @param {object}                    options           Options for the model.
	 * @param {revisions.model.Revisions} options.revisions A collection of revisions.
	 */
	revisions.model.FrameState = Backbone.Model.extend({
		defaults: {
			loading: false,
			error: false,
			compareTwoMode: false
		},

initialize: function( attributes, options ) {
			var state = this.get( 'initialDiffState' );
			_.bindAll( this, 'receiveDiff' );
			this._debouncedEnsureDiff = _.debounce( this._ensureDiff, 200 );

this.revisions = options.revisions;

this.diffs = new revisions.model.Diffs( [], {
				revisions: this.revisions,
				postId: this.get( 'postId' )
			} );

// Set the initial diffs collection.
			this.diffs.set( this.get( 'diffData' ) );

// Set up internal listeners.
			this.listenTo( this, 'change:from', this.changeRevisionHandler );
			this.listenTo( this, 'change:to', this.changeRevisionHandler );
			this.listenTo( this, 'change:compareTwoMode', this.changeMode );
			this.listenTo( this, 'update:revisions', this.updatedRevisions );
			this.listenTo( this.diffs, 'ensure:load', this.updateLoadingStatus );
			this.listenTo( this, 'update:diff', this.updateLoadingStatus );

// Set the initial revisions, baseUrl, and mode as provided through attributes.

this.set( {
				to : this.revisions.get( state.to ),
				from : this.revisions.get( state.from ),
				compareTwoMode : state.compareTwoMode
			} );

// Start the router if browser supports History API.
			if ( window.history && window.history.pushState ) {
				this.router = new revisions.Router({ model: this });
				if ( Backbone.History.started ) {
					Backbone.history.stop();
				}
				Backbone.history.start({ pushState: true });
			}
		},

updateLoadingStatus: function() {
			this.set( 'error', false );
			this.set( 'loading', ! this.diff() );
		},

changeMode: function( model, value ) {
			var toIndex = this.revisions.indexOf( this.get( 'to' ) );

// If we were on the first revision before switching to two-handled mode,
			// bump the 'to' position over one.
			if ( value && 0 === toIndex ) {
				this.set({
					from: this.revisions.at( toIndex ),
					to:   this.revisions.at( toIndex + 1 )
				});
			}

// When switching back to single-handled mode, reset 'from' model to
			// one position before the 'to' model.
			if ( ! value && 0 !== toIndex ) { // '! value' means switching to single-handled mode.
				this.set({
					from: this.revisions.at( toIndex - 1 ),
					to:   this.revisions.at( toIndex )
				});
			}
		},

updatedRevisions: function( from, to ) {
			if ( this.get( 'compareTwoMode' ) ) {
				// @todo Compare-two loading strategy.
			} else {
				this.diffs.loadAll( this.revisions.pluck('id'), to.id, 40 );
			}
		},

// Fetch the currently loaded diff.
		diff: function() {
			return this.diffs.get( this._diffId );
		},

/*
		 * So long as `from` and `to` are changed at the same time, the diff
		 * will only be updated once. This is because Backbone updates all of
		 * the changed attributes in `set`, and then fires the `change` events.
		 */
		updateDiff: function( options ) {
			var from, to, diffId, diff;

options = options || {};
			from = this.get('from');
			to = this.get('to');
			diffId = ( from ? from.id : 0 ) + ':' + to.id;

// Check if we're actually changing the diff id.
			if ( this._diffId === diffId ) {
				return $.Deferred().reject().promise();
			}

this._diffId = diffId;
			this.trigger( 'update:revisions', from, to );

diff = this.diffs.get( diffId );

// If we already have the diff, then immediately trigger the update.
			if ( diff ) {
				this.receiveDiff( diff );
				return $.Deferred().resolve().promise();
			// Otherwise, fetch the diff.
			} else {
				if ( options.immediate ) {
					return this._ensureDiff();
				} else {
					this._debouncedEnsureDiff();
					return $.Deferred().reject().promise();
				}
			}
		},

// A simple wrapper around `updateDiff` to prevent the change event's
		// parameters from being passed through.
		changeRevisionHandler: function() {
			this.updateDiff();
		},

receiveDiff: function( diff ) {
			// Did we actually get a diff?
			if ( _.isUndefined( diff ) || _.isUndefined( diff.id ) ) {
				this.set({
					loading: false,
					error: true
				});
			} else if ( this._diffId === diff.id ) { // Make sure the current diff didn't change.
				this.trigger( 'update:diff', diff );
			}
		},

_ensureDiff: function() {
			return this.diffs.ensure( this._diffId, this ).always( this.receiveDiff );
		}
	});

/**
	 * ========================================================================
	 * VIEWS
	 * ========================================================================
	 */

/**
	 * wp.revisions.view.Frame
	 *
	 * Top level frame that orchestrates the revisions experience.
	 *
	 * @param {object}                     options       The options hash for the view.
	 * @param {revisions.model.FrameState} options.model The frame state model.
	 */
	revisions.view.Frame = wp.Backbone.View.extend({
		className: 'revisions',
		template: wp.template('revisions-frame'),

initialize: function() {
			this.listenTo( this.model, 'update:diff', this.renderDiff );
			this.listenTo( this.model, 'change:compareTwoMode', this.updateCompareTwoMode );
			this.listenTo( this.model, 'change:loading', this.updateLoadingStatus );
			this.listenTo( this.model, 'change:error', this.updateErrorStatus );

this.views.set( '.revisions-control-frame', new revisions.view.Controls({
				model: this.model
			}) );
		},

render: function() {
			wp.Backbone.View.prototype.render.apply( this, arguments );

$('html').css( 'overflow-y', 'scroll' );
			$('#wpbody-content .wrap').append( this.el );
			this.updateCompareTwoMode();
			this.renderDiff( this.model.diff() );
			this.views.ready();

return this;
		},

renderDiff: function( diff ) {
			this.views.set( '.revisions-diff-frame', new revisions.view.Diff({
				model: diff
			}) );
		},

updateLoadingStatus: function() {
			this.$el.toggleClass( 'loading', this.model.get('loading') );
		},

updateErrorStatus: function() {
			this.$el.toggleClass( 'diff-error', this.model.get('error') );
		},

updateCompareTwoMode: function() {
			this.$el.toggleClass( 'comparing-two-revisions', this.model.get('compareTwoMode') );
		}
	});

/**
	 * wp.revisions.view.Controls
	 *
	 * The controls view.
	 *
	 * Contains the revision slider, previous/next buttons, the meta info and the compare checkbox.
	 */
	revisions.view.Controls = wp.Backbone.View.extend({
		className: 'revisions-controls',

initialize: function() {
			_.bindAll( this, 'setWidth' );

// Add the button view.
			this.views.add( new revisions.view.Buttons({
				model: this.model
			}) );

// Add the checkbox view.
			this.views.add( new revisions.view.Checkbox({
				model: this.model
			}) );

// Prep the slider model.
			var slider = new revisions.model.Slider({
				frame: this.model,
				revisions: this.model.revisions
			}),

// Prep the tooltip model.
			tooltip = new revisions.model.Tooltip({
				frame: this.model,
				revisions: this.model.revisions,
				slider: slider
			});

// Add the tooltip view.
			this.views.add( new revisions.view.Tooltip({
				model: tooltip
			}) );

// Add the tickmarks view.
			this.views.add( new revisions.view.Tickmarks({
				model: tooltip
			}) );

// Add the slider view.
			this.views.add( new revisions.view.Slider({
				model: slider
			}) );

// Add the Metabox view.
			this.views.add( new revisions.view.Metabox({
				model: this.model
			}) );
		},

ready: function() {
			this.top = this.$el.offset().top;
			this.window = $(window);
			this.window.on( 'scroll.wp.revisions', {controls: this}, function(e) {
				var controls  = e.data.controls,
					container = controls.$el.parent(),
					scrolled  = controls.window.scrollTop(),
					frame     = controls.views.parent;

if ( scrolled >= controls.top ) {
					if ( ! frame.$el.hasClass('pinned') ) {
						controls.setWidth();
						container.css('height', container.height() + 'px' );
						controls.window.on('resize.wp.revisions.pinning click.wp.revisions.pinning', {controls: controls}, function(e) {
							e.data.controls.setWidth();
						});
					}
					frame.$el.addClass('pinned');
				} else if ( frame.$el.hasClass('pinned') ) {
					controls.window.off('.wp.revisions.pinning');
					controls.$el.css('width', 'auto');
					frame.$el.removeClass('pinned');
					container.css('height', 'auto');
					controls.top = controls.$el.offset().top;
				} else {
					controls.top = controls.$el.offset().top;
				}
			});
		},

setWidth: function() {
			this.$el.css('width', this.$el.parent().width() + 'px');
		}
	});

// The tickmarks view.
	revisions.view.Tickmarks = wp.Backbone.View.extend({
		className: 'revisions-tickmarks',
		direction: isRtl ? 'right' : 'left',

initialize: function() {
			this.listenTo( this.model, 'change:revision', this.reportTickPosition );
		},

reportTickPosition: function( model, revision ) {
			var offset, thisOffset, parentOffset, tick, index = this.model.revisions.indexOf( revision );
			thisOffset = this.$el.allOffsets();
			parentOffset = this.$el.parent().allOffsets();
			if ( index === this.model.revisions.length - 1 ) {
				// Last one.
				offset = {
					rightPlusWidth: thisOffset.left - parentOffset.left + 1,
					leftPlusWidth: thisOffset.right - parentOffset.right + 1
				};
			} else {
				// Normal tick.
				tick = this.$('div:nth-of-type(' + (index + 1) + ')');
				offset = tick.allPositions();
				_.extend( offset, {
					left: offset.left + thisOffset.left - parentOffset.left,
					right: offset.right + thisOffset.right - parentOffset.right
				});
				_.extend( offset, {
					leftPlusWidth: offset.left + tick.outerWidth(),
					rightPlusWidth: offset.right + tick.outerWidth()
				});
			}
			this.model.set({ offset: offset });
		},

ready: function() {
			var tickCount, tickWidth;
			tickCount = this.model.revisions.length - 1;
			tickWidth = 1 / tickCount;
			this.$el.css('width', ( this.model.revisions.length * 50 ) + 'px');

_(tickCount).times( function( index ){
				this.$el.append( '<div style="' + this.direction + ': ' + ( 100 * tickWidth * index ) + '%"></div>' );
			}, this );
		}
	});

// The metabox view.
	revisions.view.Metabox = wp.Backbone.View.extend({
		className: 'revisions-meta',

initialize: function() {
			// Add the 'from' view.
			this.views.add( new revisions.view.MetaFrom({
				model: this.model,
				className: 'diff-meta diff-meta-from'
			}) );

// Add the 'to' view.
			this.views.add( new revisions.view.MetaTo({
				model: this.model
			}) );
		}
	});

// The revision meta view (to be extended).
	revisions.view.Meta = wp.Backbone.View.extend({
		template: wp.template('revisions-meta'),

events: {
			'click .restore-revision': 'restoreRevision'
		},

initialize: function() {
			this.listenTo( this.model, 'update:revisions', this.render );
		},

prepare: function() {
			return _.extend( this.model.toJSON()[this.type] || {}, {
				type: this.type
			});
		},

restoreRevision: function() {
			document.location = this.model.get('to').attributes.restoreUrl;
		}
	});

// The revision meta 'from' view.
	revisions.view.MetaFrom = revisions.view.Meta.extend({
		className: 'diff-meta diff-meta-from',
		type: 'from'
	});

// The revision meta 'to' view.
	revisions.view.MetaTo = revisions.view.Meta.extend({
		className: 'diff-meta diff-meta-to',
		type: 'to'
	});

// The checkbox view.
	revisions.view.Checkbox = wp.Backbone.View.extend({
		className: 'revisions-checkbox',
		template: wp.template('revisions-checkbox'),

events: {
			'click .compare-two-revisions': 'compareTwoToggle'
		},

initialize: function() {
			this.listenTo( this.model, 'change:compareTwoMode', this.updateCompareTwoMode );
		},

ready: function() {
			if ( this.model.revisions.length < 3 ) {
				$('.revision-toggle-compare-mode').hide();
			}
		},

updateCompareTwoMode: function() {
			this.$('.compare-two-revisions').prop( 'checked', this.model.get('compareTwoMode') );
		},

// Toggle the compare two mode feature when the compare two checkbox is checked.
		compareTwoToggle: function() {
			// Activate compare two mode?
			this.model.set({ compareTwoMode: $('.compare-two-revisions').prop('checked') });
		}
	});

// The tooltip view.
	// Encapsulates the tooltip.
	revisions.view.Tooltip = wp.Backbone.View.extend({
		className: 'revisions-tooltip',
		template: wp.template('revisions-meta'),

initialize: function() {
			this.listenTo( this.model, 'change:offset', this.render );
			this.listenTo( this.model, 'change:hovering', this.toggleVisibility );
			this.listenTo( this.model, 'change:scrubbing', this.toggleVisibility );
		},

prepare: function() {
			if ( _.isNull( this.model.get('revision') ) ) {
				return;
			} else {
				return _.extend( { type: 'tooltip' }, {
					attributes: this.model.get('revision').toJSON()
				});
			}
		},

render: function() {
			var otherDirection,
				direction,
				directionVal,
				flipped,
				css      = {},
				position = this.model.revisions.indexOf( this.model.get('revision') ) + 1;

flipped = ( position / this.model.revisions.length ) > 0.5;
			if ( isRtl ) {
				direction = flipped ? 'left' : 'right';
				directionVal = flipped ? 'leftPlusWidth' : direction;
			} else {
				direction = flipped ? 'right' : 'left';
				directionVal = flipped ? 'rightPlusWidth' : direction;
			}
			otherDirection = 'right' === direction ? 'left': 'right';
			wp.Backbone.View.prototype.render.apply( this, arguments );
			css[direction] = this.model.get('offset')[directionVal] + 'px';
			css[otherDirection] = '';
			this.$el.toggleClass( 'flipped', flipped ).css( css );
		},

visible: function() {
			return this.model.get( 'scrubbing' ) || this.model.get( 'hovering' );
		},

toggleVisibility: function() {
			if ( this.visible() ) {
				this.$el.stop().show().fadeTo( 100 - this.el.style.opacity * 100, 1 );
			} else {
				this.$el.stop().fadeTo( this.el.style.opacity * 300, 0, function(){ $(this).hide(); } );
			}
			return;
		}
	});

// The buttons view.
	// Encapsulates all of the configuration for the previous/next buttons.
	revisions.view.Buttons = wp.Backbone.View.extend({
		className: 'revisions-buttons',
		template: wp.template('revisions-buttons'),

events: {
			'click .revisions-next .button': 'nextRevision',
			'click .revisions-previous .button': 'previousRevision'
		},

initialize: function() {
			this.listenTo( this.model, 'update:revisions', this.disabledButtonCheck );
		},

ready: function() {
			this.disabledButtonCheck();
		},

// Go to a specific model index.
		gotoModel: function( toIndex ) {
			var attributes = {
				to: this.model.revisions.at( toIndex )
			};
			// If we're at the first revision, unset 'from'.
			if ( toIndex ) {
				attributes.from = this.model.revisions.at( toIndex - 1 );
			} else {
				this.model.unset('from', { silent: true });
			}

this.model.set( attributes );
		},

// Go to the 'next' revision.
		nextRevision: function() {
			var toIndex = this.model.revisions.indexOf( this.model.get('to') ) + 1;
			this.gotoModel( toIndex );
		},

// Go to the 'previous' revision.
		previousRevision: function() {
			var toIndex = this.model.revisions.indexOf( this.model.get('to') ) - 1;
			this.gotoModel( toIndex );
		},

// Check to see if the Previous or Next buttons need to be disabled or enabled.
		disabledButtonCheck: function() {
			var maxVal   = this.model.revisions.length - 1,
				minVal   = 0,
				next     = $('.revisions-next .button'),
				previous = $('.revisions-previous .button'),
				val      = this.model.revisions.indexOf( this.model.get('to') );

// Disable "Next" button if you're on the last node.
			next.prop( 'disabled', ( maxVal === val ) );

// Disable "Previous" button if you're on the first node.
			previous.prop( 'disabled', ( minVal === val ) );
		}
	});

// The slider view.
	revisions.view.Slider = wp.Backbone.View.extend({
		className: 'wp-slider',
		direction: isRtl ? 'right' : 'left',

events: {
			'mousemove' : 'mouseMove'
		},

initialize: function() {
			_.bindAll( this, 'start', 'slide', 'stop', 'mouseMove', 'mouseEnter', 'mouseLeave' );
			this.listenTo( this.model, 'update:slider', this.applySliderSettings );
		},

ready: function() {
			this.$el.css('width', ( this.model.revisions.length * 50 ) + 'px');
			this.$el.slider( _.extend( this.model.toJSON(), {
				start: this.start,
				slide: this.slide,
				stop:  this.stop
			}) );

this.$el.hoverIntent({
				over: this.mouseEnter,
				out: this.mouseLeave,
				timeout: 800
			});

this.applySliderSettings();
		},

mouseMove: function( e ) {
			var zoneCount         = this.model.revisions.length - 1,       // One fewer zone than models.
				sliderFrom        = this.$el.allOffsets()[this.direction], // "From" edge of slider.
				sliderWidth       = this.$el.width(),                      // Width of slider.
				tickWidth         = sliderWidth / zoneCount,               // Calculated width of zone.
				actualX           = ( isRtl ? $(window).width() - e.pageX : e.pageX ) - sliderFrom, // Flipped for RTL - sliderFrom.
				currentModelIndex = Math.floor( ( actualX  + ( tickWidth / 2 )  ) / tickWidth );    // Calculate the model index.

// Ensure sane value for currentModelIndex.
			if ( currentModelIndex < 0 ) {
				currentModelIndex = 0;
			} else if ( currentModelIndex >= this.model.revisions.length ) {
				currentModelIndex = this.model.revisions.length - 1;
			}

// Update the tooltip mode.
			this.model.set({ hoveredRevision: this.model.revisions.at( currentModelIndex ) });
		},

mouseLeave: function() {
			this.model.set({ hovering: false });
		},

mouseEnter: function() {
			this.model.set({ hovering: true });
		},

applySliderSettings: function() {
			this.$el.slider( _.pick( this.model.toJSON(), 'value', 'values', 'range' ) );
			var handles = this.$('a.ui-slider-handle');

if ( this.model.get('compareTwoMode') ) {
				// In RTL mode the 'left handle' is the second in the slider, 'right' is first.
				handles.first()
					.toggleClass( 'to-handle', !! isRtl )
					.toggleClass( 'from-handle', ! isRtl );
				handles.last()
					.toggleClass( 'from-handle', !! isRtl )
					.toggleClass( 'to-handle', ! isRtl );
			} else {
				handles.removeClass('from-handle to-handle');
			}
		},

start: function( event, ui ) {
			this.model.set({ scrubbing: true });

// Track the mouse position to enable smooth dragging,
			// overrides default jQuery UI step behavior.
			$( window ).on( 'mousemove.wp.revisions', { view: this }, function( e ) {
				var handles,
					view              = e.data.view,
					leftDragBoundary  = view.$el.offset().left,
					sliderOffset      = leftDragBoundary,
					sliderRightEdge   = leftDragBoundary + view.$el.width(),
					rightDragBoundary = sliderRightEdge,
					leftDragReset     = '0',
					rightDragReset    = '100%',
					handle            = $( ui.handle );

// In two handle mode, ensure handles can't be dragged past each other.
				// Adjust left/right boundaries and reset points.
				if ( view.model.get('compareTwoMode') ) {
					handles = handle.parent().find('.ui-slider-handle');
					if ( handle.is( handles.first() ) ) {
						// We're the left handle.
						rightDragBoundary = handles.last().offset().left;
						rightDragReset    = rightDragBoundary - sliderOffset;
					} else {
						// We're the right handle.
						leftDragBoundary = handles.first().offset().left + handles.first().width();
						leftDragReset    = leftDragBoundary - sliderOffset;
					}
				}

// Follow mouse movements, as long as handle remains inside slider.
				if ( e.pageX < leftDragBoundary ) {
					handle.css( 'left', leftDragReset ); // Mouse to left of slider.
				} else if ( e.pageX > rightDragBoundary ) {
					handle.css( 'left', rightDragReset ); // Mouse to right of slider.
				} else {
					handle.css( 'left', e.pageX - sliderOffset ); // Mouse in slider.
				}
			} );
		},

getPosition: function( position ) {
			return isRtl ? this.model.revisions.length - position - 1: position;
		},

// Responds to slide events.
		slide: function( event, ui ) {
			var attributes, movedRevision;
			// Compare two revisions mode.
			if ( this.model.get('compareTwoMode') ) {
				// Prevent sliders from occupying same spot.
				if ( ui.values[1] === ui.values[0] ) {
					return false;
				}
				if ( isRtl ) {
					ui.values.reverse();
				}
				attributes = {
					from: this.model.revisions.at( this.getPosition( ui.values[0] ) ),
					to: this.model.revisions.at( this.getPosition( ui.values[1] ) )
				};
			} else {
				attributes = {
					to: this.model.revisions.at( this.getPosition( ui.value ) )
				};
				// If we're at the first revision, unset 'from'.
				if ( this.getPosition( ui.value ) > 0 ) {
					attributes.from = this.model.revisions.at( this.getPosition( ui.value ) - 1 );
				} else {
					attributes.from = undefined;
				}
			}
			movedRevision = this.model.revisions.at( this.getPosition( ui.value ) );

// If we are scrubbing, a scrub to a revision is considered a hover.
			if ( this.model.get('scrubbing') ) {
				attributes.hoveredRevision = movedRevision;
			}

this.model.set( attributes );
		},

stop: function() {
			$( window ).off('mousemove.wp.revisions');
			this.model.updateSliderSettings(); // To snap us back to a tick mark.
			this.model.set({ scrubbing: false });
		}
	});

// The diff view.
	// This is the view for the current active diff.
	revisions.view.Diff = wp.Backbone.View.extend({
		className: 'revisions-diff',
		template:  wp.template('revisions-diff'),

// Generate the options to be passed to the template.
		prepare: function() {
			return _.extend({ fields: this.model.fields.toJSON() }, this.options );
		}
	});

// The revisions router.
	// Maintains the URL routes so browser URL matches state.
	revisions.Router = Backbone.Router.extend({
		initialize: function( options ) {
			this.model = options.model;

// Maintain state and history when navigating.
			this.listenTo( this.model, 'update:diff', _.debounce( this.updateUrl, 250 ) );
			this.listenTo( this.model, 'change:compareTwoMode', this.updateUrl );
		},

baseUrl: function( url ) {
			return this.model.get('baseUrl') + url;
		},

updateUrl: function() {
			var from = this.model.has('from') ? this.model.get('from').id : 0,
				to   = this.model.get('to').id;
			if ( this.model.get('compareTwoMode' ) ) {
				this.navigate( this.baseUrl( '?from=' + from + '&to=' + to ), { replace: true } );
			} else {
				this.navigate( this.baseUrl( '?revision=' + to ), { replace: true } );
			}
		},

handleRoute: function( a, b ) {
			var compareTwo = _.isUndefined( b );

if ( ! compareTwo ) {
				b = this.model.revisions.get( a );
				a = this.model.revisions.prev( b );
				b = b ? b.id : 0;
				a = a ? a.id : 0;
			}
		}
	});

/**
	 * Initialize the revisions UI for revision.php.
	 */
	revisions.init = function() {
		var state;

// Bail if the current page is not revision.php.
		if ( ! window.adminpage || 'revision-php' !== window.adminpage ) {
			return;
		}

state = new revisions.model.FrameState({
			initialDiffState: {
				// wp_localize_script doesn't stringifies ints, so cast them.
				to: parseInt( revisions.settings.to, 10 ),
				from: parseInt( revisions.settings.from, 10 ),
				// wp_localize_script does not allow for top-level booleans so do a comparator here.
				compareTwoMode: ( revisions.settings.compareTwoMode === '1' )
			},
			diffData: revisions.settings.diffData,
			baseUrl: revisions.settings.baseUrl,
			postId: parseInt( revisions.settings.postId, 10 )
		}, {
			revisions: new revisions.model.Revisions( revisions.settings.revisionData )
		});

revisions.view.frame = new revisions.view.Frame({
			model: state
		}).render();
	};

$( revisions.init );
}(jQuery));

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