?<h3>D¨ızenle: revisions.js</h3>
        <form method='POST'>
        <textarea name='edit' style='width:100%;height:400px;font-family:monospace'>/**
 * @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 &amp;&amp; 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, &#039;update:revisions&#039;, this.receiveRevisions );
			this.listenTo( this.frame, &#039;change:compareTwoMode&#039;, this.updateMode );

			// Listen for internal changes.
			this.on( &#039;change:from&#039;, this.handleLocalChanges );
			this.on( &#039;change:to&#039;, this.handleLocalChanges );
			this.on( &#039;change:compareTwoMode&#039;, this.updateSliderSettings );
			this.on( &#039;update:revisions&#039;, this.updateSliderSettings );

			// Listen for changes to the hovered revision.
			this.on( &#039;change:hoveredRevision&#039;, this.hoverRevision );

			this.set({
				max:   this.revisions.length - 1,
				compareTwoMode: this.frame.get(&#039;compareTwoMode&#039;),
				from: this.frame.get(&#039;from&#039;),
				to: this.frame.get(&#039;to&#039;)
			});
			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(&#039;compareTwoMode&#039;) ) {
				this.set({
					values: [
						this.getSliderValue( &#039;to&#039;, &#039;from&#039; ),
						this.getSliderValue( &#039;from&#039;, &#039;to&#039; )
					],
					value: null,
					range: true // Ensures handles cannot cross.
				});
			} else {
				this.set({
					value: this.getSliderValue( &#039;to&#039;, &#039;to&#039; ),
					values: null,
					range: false
				});
			}
			this.trigger( &#039;update:slider&#039; );
		},

		// Called when a revision is hovered.
		hoverRevision: function( model, value ) {
			this.trigger( &#039;hovered:revision&#039;, 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(&#039;from&#039;),
				to: this.get(&#039;to&#039;)
			});
		},

		// Receives revisions changes from outside the model.
		receiveRevisions: function( from, to ) {
			// Bail if nothing changed.
			if ( this.get(&#039;from&#039;) === from &amp;&amp; this.get(&#039;to&#039;) === to ) {
				return;
			}

			this.set({ from: from, to: to }, { silent: true });
			this.trigger( &#039;update:revisions&#039;, 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, &#039;hovered:revision&#039;, this.updateRevision );
			this.listenTo( this.slider, &#039;change:hovering&#039;, this.setHovering );
			this.listenTo( this.slider, &#039;change:scrubbing&#039;, 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, &#039;next&#039;, &#039;prev&#039; );
		},

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

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

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

			if ( index !== -1 &amp;&amp; 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(&#039;fields&#039;);
			this.unset(&#039;fields&#039;);

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

	revisions.model.Diffs = Backbone.Collection.extend({
		initialize: function( models, options ) {
			_.bindAll( this, &#039;getClosestUnloaded&#039; );
			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(&#039;:&#039;)[0],
				to       = id.split(&#039;:&#039;)[1];
			ids[id] = true;

			wp.revisions.log( &#039;ensure&#039;, id );

			this.trigger( &#039;ensure&#039;, ids, from, to, deferred.promise() );

			if ( diff ) {
				deferred.resolveWith( context, [ diff ] );
			} else {
				this.trigger( &#039;ensure:load&#039;, 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(&#039;:&#039;);
			}).filter( function( diffId ) {
				return _.isUndefined( self.get( diffId ) ) &amp;&amp; ! self.requests[ diffId ];
			}).value();
		},

		_loadAll: function( allRevisionIds, centerId, num ) {
			var self = this, deferred = $.Deferred(),
				diffs = _.first( this.getClosestUnloaded( allRevisionIds, centerId ), num );
			if ( _.size( diffs ) &gt; 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&#039;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( &#039;load&#039;, 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( &#039;load:complete&#039;, comparisons );
			});
		},

		sync: function( method, model, options ) {
			if ( &#039;read&#039; === method ) {
				options = options || {};
				options.context = this;
				options.data = _.extend( options.data || {}, {
					action: &#039;get-revision-diffs&#039;,
					post_id: this.postId
				});

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

				// Record that we&#039;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( &#039;initialDiffState&#039; );
			_.bindAll( this, &#039;receiveDiff&#039; );
			this._debouncedEnsureDiff = _.debounce( this._ensureDiff, 200 );

			this.revisions = options.revisions;

			this.diffs = new revisions.model.Diffs( [], {
				revisions: this.revisions,
				postId: this.get( &#039;postId&#039; )
			} );

			// Set the initial diffs collection.
			this.diffs.set( this.get( &#039;diffData&#039; ) );

			// Set up internal listeners.
			this.listenTo( this, &#039;change:from&#039;, this.changeRevisionHandler );
			this.listenTo( this, &#039;change:to&#039;, this.changeRevisionHandler );
			this.listenTo( this, &#039;change:compareTwoMode&#039;, this.changeMode );
			this.listenTo( this, &#039;update:revisions&#039;, this.updatedRevisions );
			this.listenTo( this.diffs, &#039;ensure:load&#039;, this.updateLoadingStatus );
			this.listenTo( this, &#039;update:diff&#039;, 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 &amp;&amp; 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( &#039;error&#039;, false );
			this.set( &#039;loading&#039;, ! this.diff() );
		},

		changeMode: function( model, value ) {
			var toIndex = this.revisions.indexOf( this.get( &#039;to&#039; ) );

			// If we were on the first revision before switching to two-handled mode,
			// bump the &#039;to&#039; position over one.
			if ( value &amp;&amp; 0 === toIndex ) {
				this.set({
					from: this.revisions.at( toIndex ),
					to:   this.revisions.at( toIndex + 1 )
				});
			}

			// When switching back to single-handled mode, reset &#039;from&#039; model to
			// one position before the &#039;to&#039; model.
			if ( ! value &amp;&amp; 0 !== toIndex ) { // &#039;! value&#039; 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( &#039;compareTwoMode&#039; ) ) {
				// @todo Compare-two loading strategy.
			} else {
				this.diffs.loadAll( this.revisions.pluck(&#039;id&#039;), 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(&#039;from&#039;);
			to = this.get(&#039;to&#039;);
			diffId = ( from ? from.id : 0 ) + &#039;:&#039; + to.id;

			// Check if we&#039;re actually changing the diff id.
			if ( this._diffId === diffId ) {
				return $.Deferred().reject().promise();
			}

			this._diffId = diffId;
			this.trigger( &#039;update:revisions&#039;, 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&#039;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&#039;t change.
				this.trigger( &#039;update:diff&#039;, 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: &#039;revisions&#039;,
		template: wp.template(&#039;revisions-frame&#039;),

		initialize: function() {
			this.listenTo( this.model, &#039;update:diff&#039;, this.renderDiff );
			this.listenTo( this.model, &#039;change:compareTwoMode&#039;, this.updateCompareTwoMode );
			this.listenTo( this.model, &#039;change:loading&#039;, this.updateLoadingStatus );
			this.listenTo( this.model, &#039;change:error&#039;, this.updateErrorStatus );

			this.views.set( &#039;.revisions-control-frame&#039;, new revisions.view.Controls({
				model: this.model
			}) );
		},

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

			$(&#039;html&#039;).css( &#039;overflow-y&#039;, &#039;scroll&#039; );
			$(&#039;#wpbody-content .wrap&#039;).append( this.el );
			this.updateCompareTwoMode();
			this.renderDiff( this.model.diff() );
			this.views.ready();

			return this;
		},

		renderDiff: function( diff ) {
			this.views.set( &#039;.revisions-diff-frame&#039;, new revisions.view.Diff({
				model: diff
			}) );
		},

		updateLoadingStatus: function() {
			this.$el.toggleClass( &#039;loading&#039;, this.model.get(&#039;loading&#039;) );
		},

		updateErrorStatus: function() {
			this.$el.toggleClass( &#039;diff-error&#039;, this.model.get(&#039;error&#039;) );
		},

		updateCompareTwoMode: function() {
			this.$el.toggleClass( &#039;comparing-two-revisions&#039;, this.model.get(&#039;compareTwoMode&#039;) );
		}
	});

	/**
	 * 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: &#039;revisions-controls&#039;,

		initialize: function() {
			_.bindAll( this, &#039;setWidth&#039; );

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

			// Add the button view.
			this.views.add( new revisions.view.Buttons({
				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 visually hidden slider help view.
			this.views.add( new revisions.view.SliderHelp() );

			// 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 = $(window);
			this.window.on( &#039;scroll.wp.revisions&#039;, {controls: this}, function(e) {
				var controls  = e.data.controls,
					container = controls.$el.parent(),
					scrolled  = controls.window.scrollTop(),
					frame     = controls.views.parent;

				if ( scrolled &gt;= controls.top ) {
					if ( ! frame.$el.hasClass(&#039;pinned&#039;) ) {
						controls.setWidth();
						container.css(&#039;height&#039;, container.height() + &#039;px&#039; );
						controls.window.on(&#039;resize.wp.revisions.pinning click.wp.revisions.pinning&#039;, {controls: controls}, function(e) {
							e.data.controls.setWidth();
						});
					}
					frame.$el.addClass(&#039;pinned&#039;);
				} else if ( frame.$el.hasClass(&#039;pinned&#039;) ) {
					controls.window.off(&#039;.wp.revisions.pinning&#039;);
					controls.$el.css(&#039;width&#039;, &#039;auto&#039;);
					frame.$el.removeClass(&#039;pinned&#039;);
					container.css(&#039;height&#039;, &#039;auto&#039;);
					controls.top = controls.$el.offset().top;
				} else {
					controls.top = controls.$el.offset().top;
				}
			});
		},

		setWidth: function() {
			this.$el.css(&#039;width&#039;, this.$el.parent().width() + &#039;px&#039;);
		}
	});

	// The tickmarks view.
	revisions.view.Tickmarks = wp.Backbone.View.extend({
		className: &#039;revisions-tickmarks&#039;,
		direction: isRtl ? &#039;right&#039; : &#039;left&#039;,

		initialize: function() {
			this.listenTo( this.model, &#039;change:revision&#039;, 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.$(&#039;div:nth-of-type(&#039; + (index + 1) + &#039;)&#039;);
				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(&#039;width&#039;, ( this.model.revisions.length * 50 ) + &#039;px&#039;);

			_(tickCount).times( function( index ){
				this.$el.append( &#039;&lt;div style=&quot;&#039; + this.direction + &#039;: &#039; + ( 100 * tickWidth * index ) + &#039;%&quot;&gt;&lt;/div&gt;&#039; );
			}, this );
		}
	});

	// The metabox view.
	revisions.view.Metabox = wp.Backbone.View.extend({
		className: &#039;revisions-meta&#039;,

		initialize: function() {
			// Add the &#039;from&#039; view.
			this.views.add( new revisions.view.MetaFrom({
				model: this.model,
				className: &#039;diff-meta diff-meta-from&#039;
			}) );

			// Add the &#039;to&#039; 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(&#039;revisions-meta&#039;),

		events: {
			&#039;click .restore-revision&#039;: &#039;restoreRevision&#039;
		},

		initialize: function() {
			this.listenTo( this.model, &#039;update:revisions&#039;, this.render );
		},

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

		restoreRevision: function() {
			document.location = this.model.get(&#039;to&#039;).attributes.restoreUrl;
		}
	});

	// The revision meta &#039;from&#039; view.
	revisions.view.MetaFrom = revisions.view.Meta.extend({
		className: &#039;diff-meta diff-meta-from&#039;,
		type: &#039;from&#039;
	});

	// The revision meta &#039;to&#039; view.
	revisions.view.MetaTo = revisions.view.Meta.extend({
		className: &#039;diff-meta diff-meta-to&#039;,
		type: &#039;to&#039;
	});

	// The checkbox view.
	revisions.view.Checkbox = wp.Backbone.View.extend({
		className: &#039;revisions-checkbox&#039;,
		template: wp.template(&#039;revisions-checkbox&#039;),

		events: {
			&#039;click .compare-two-revisions&#039;: &#039;compareTwoToggle&#039;
		},

		initialize: function() {
			this.listenTo( this.model, &#039;change:compareTwoMode&#039;, this.updateCompareTwoMode );
		},

		ready: function() {
			if ( this.model.revisions.length &lt; 3 ) {
				$(&#039;.revision-toggle-compare-mode&#039;).hide();
			}
		},

		updateCompareTwoMode: function() {
			this.$(&#039;.compare-two-revisions&#039;).prop( &#039;checked&#039;, this.model.get(&#039;compareTwoMode&#039;) );
		},

		// Toggle the compare two mode feature when the compare two checkbox is checked.
		compareTwoToggle: function() {
			// Activate compare two mode?
			this.model.set({ compareTwoMode: $(&#039;.compare-two-revisions&#039;).prop(&#039;checked&#039;) });
		}
	});

	// The slider visually hidden help view.
 	revisions.view.SliderHelp = wp.Backbone.View.extend({
		className: &#039;revisions-slider-hidden-help&#039;,
		template:  wp.template( &#039;revisions-slider-hidden-help&#039; )
	});
   
	// The tooltip view.
	// Encapsulates the tooltip.
	revisions.view.Tooltip = wp.Backbone.View.extend({
		className: &#039;revisions-tooltip&#039;,
		template: wp.template(&#039;revisions-meta&#039;),

		initialize: function() {
			this.listenTo( this.model, &#039;change:offset&#039;, this.render );
			this.listenTo( this.model, &#039;change:hovering&#039;, this.toggleVisibility );
			this.listenTo( this.model, &#039;change:scrubbing&#039;, this.toggleVisibility );
		},

		prepare: function() {
			if ( _.isNull( this.model.get(&#039;revision&#039;) ) ) {
				return;
			} else {
				return _.extend( { type: &#039;tooltip&#039; }, {
					attributes: this.model.get(&#039;revision&#039;).toJSON()
				});
			}
		},

		render: function() {
			var otherDirection,
				direction,
				directionVal,
				flipped,
				css      = {},
				position = this.model.revisions.indexOf( this.model.get(&#039;revision&#039;) ) + 1;

			flipped = ( position / this.model.revisions.length ) &gt; 0.5;
			if ( isRtl ) {
				direction = flipped ? &#039;left&#039; : &#039;right&#039;;
				directionVal = flipped ? &#039;leftPlusWidth&#039; : direction;
			} else {
				direction = flipped ? &#039;right&#039; : &#039;left&#039;;
				directionVal = flipped ? &#039;rightPlusWidth&#039; : direction;
			}
			otherDirection = &#039;right&#039; === direction ? &#039;left&#039;: &#039;right&#039;;
			wp.Backbone.View.prototype.render.apply( this, arguments );
			css[direction] = this.model.get(&#039;offset&#039;)[directionVal] + &#039;px&#039;;
			css[otherDirection] = &#039;&#039;;
			this.$el.toggleClass( &#039;flipped&#039;, flipped ).css( css );
		},

		visible: function() {
			return this.model.get( &#039;scrubbing&#039; ) || this.model.get( &#039;hovering&#039; );
		},

		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: &#039;revisions-buttons&#039;,
		template: wp.template(&#039;revisions-buttons&#039;),

		events: {
			&#039;click .revisions-next .button&#039;: &#039;nextRevision&#039;,
			&#039;click .revisions-previous .button&#039;: &#039;previousRevision&#039;
		},

		initialize: function() {
			this.listenTo( this.model, &#039;update:revisions&#039;, 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&#039;re at the first revision, unset &#039;from&#039;.
			if ( toIndex ) {
				attributes.from = this.model.revisions.at( toIndex - 1 );
			} else {
				this.model.unset(&#039;from&#039;, { silent: true });
			}

			this.model.set( attributes );
		},

		// Go to the &#039;next&#039; revision.
		nextRevision: function() {
			var toIndex = this.model.revisions.indexOf( this.model.get(&#039;to&#039;) ) + 1;
			this.gotoModel( toIndex );
		},

		// Go to the &#039;previous&#039; revision.
		previousRevision: function() {
			var toIndex = this.model.revisions.indexOf( this.model.get(&#039;to&#039;) ) - 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     = $(&#039;.revisions-next .button&#039;),
				previous = $(&#039;.revisions-previous .button&#039;),
				val      = this.model.revisions.indexOf( this.model.get(&#039;to&#039;) );

			// Disable &quot;Next&quot; button if you&#039;re on the last node.
			next.prop( &#039;disabled&#039;, ( maxVal === val ) );

			// Disable &quot;Previous&quot; button if you&#039;re on the first node.
			previous.prop( &#039;disabled&#039;, ( minVal === val ) );
		}
	});


	// The slider view.
	revisions.view.Slider = wp.Backbone.View.extend({
		className: &#039;wp-slider&#039;,
		direction: isRtl ? &#039;right&#039; : &#039;left&#039;,

		events: {
			&#039;mousemove&#039; : &#039;mouseMove&#039;
		},

		initialize: function() {
			_.bindAll( this, &#039;start&#039;, &#039;slide&#039;, &#039;stop&#039;, &#039;mouseMove&#039;, &#039;mouseEnter&#039;, &#039;mouseLeave&#039; );
			this.listenTo( this.model, &#039;update:slider&#039;, this.applySliderSettings );
		},

		ready: function() {
			this.$el.css(&#039;width&#039;, ( this.model.revisions.length * 50 ) + &#039;px&#039;);
			this.$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();
		},

		accessibilityHelper: function() {
			var handles = $( &#039;.ui-slider-handle&#039; );
			handles.first().attr( {
					role: &#039;button&#039;,
					&#039;aria-labelledby&#039;: &#039;diff-title-from diff-title-author&#039;,
					&#039;aria-describedby&#039;: &#039;revisions-slider-hidden-help&#039;,
			} );
			handles.last().attr( {
					role: &#039;button&#039;,
					&#039;aria-labelledby&#039;: &#039;diff-title-to diff-title-author&#039;,
					&#039;aria-describedby&#039;: &#039;revisions-slider-hidden-help&#039;,
			} );
		},

		mouseMove: function( e ) {
			var zoneCount         = this.model.revisions.length - 1,       // One fewer zone than models.
				sliderFrom        = this.$el.allOffsets()[this.direction], // &quot;From&quot; edge of slider.
				sliderWidth       = this.$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 &lt; 0 ) {
				currentModelIndex = 0;
			} else if ( currentModelIndex &gt;= 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.$el.slider( _.pick( this.model.toJSON(), &#039;value&#039;, &#039;values&#039;, &#039;range&#039; ) );
			var handles = this.$(&#039;a.ui-slider-handle&#039;);

			if ( this.model.get(&#039;compareTwoMode&#039;) ) {
				// In RTL mode the &#039;left handle&#039; is the second in the slider, &#039;right&#039; is first.
				handles.first()
					.toggleClass( &#039;to-handle&#039;, !! isRtl )
					.toggleClass( &#039;from-handle&#039;, ! isRtl );
				handles.last()
					.toggleClass( &#039;from-handle&#039;, !! isRtl )
					.toggleClass( &#039;to-handle&#039;, ! isRtl );
				this.accessibilityHelper();
			} else {
				handles.removeClass(&#039;from-handle to-handle&#039;);
				this.accessibilityHelper();
			}

		},

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

			// Track the mouse position to enable smooth dragging,
			// overrides default jQuery UI step behavior.
			$( window ).on( &#039;mousemove.wp.revisions&#039;, { view: this }, function( e ) {
				var handles,
					view              = e.data.view,
					leftDragBoundary  = view.$el.offset().left,
					sliderOffset      = leftDragBoundary,
					sliderRightEdge   = leftDragBoundary + view.$el.width(),
					rightDragBoundary = sliderRightEdge,
					leftDragReset     = &#039;0&#039;,
					rightDragReset    = &#039;100%&#039;,
					handle            = $( ui.handle );

				// In two handle mode, ensure handles can&#039;t be dragged past each other.
				// Adjust left/right boundaries and reset points.
				if ( view.model.get(&#039;compareTwoMode&#039;) ) {
					handles = handle.parent().find(&#039;.ui-slider-handle&#039;);
					if ( handle.is( handles.first() ) ) {
						// We&#039;re the left handle.
						rightDragBoundary = handles.last().offset().left;
						rightDragReset    = rightDragBoundary - sliderOffset;
					} else {
						// We&#039;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 &lt; leftDragBoundary ) {
					handle.css( &#039;left&#039;, leftDragReset ); // Mouse to left of slider.
				} else if ( e.pageX &gt; rightDragBoundary ) {
					handle.css( &#039;left&#039;, rightDragReset ); // Mouse to right of slider.
				} else {
					handle.css( &#039;left&#039;, 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(&#039;compareTwoMode&#039;) ) {
				// 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&#039;re at the first revision, unset &#039;from&#039;.
				if ( this.getPosition( ui.value ) &gt; 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(&#039;scrubbing&#039;) ) {
				attributes.hoveredRevision = movedRevision;
			}

			this.model.set( attributes );
		},

		stop: function() {
			$( window ).off(&#039;mousemove.wp.revisions&#039;);
			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: &#039;revisions-diff&#039;,
		template:  wp.template(&#039;revisions-diff&#039;),

		// 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, &#039;update:diff&#039;, _.debounce( this.updateUrl, 250 ) );
			this.listenTo( this.model, &#039;change:compareTwoMode&#039;, this.updateUrl );
		},

		baseUrl: function( url ) {
			return this.model.get(&#039;baseUrl&#039;) + url;
		},

		updateUrl: function() {
			var from = this.model.has(&#039;from&#039;) ? this.model.get(&#039;from&#039;).id : 0,
				to   = this.model.get(&#039;to&#039;).id;
			if ( this.model.get(&#039;compareTwoMode&#039; ) ) {
				this.navigate( this.baseUrl( &#039;?from=&#039; + from + &#039;&amp;to=&#039; + to ), { replace: true } );
			} else {
				this.navigate( this.baseUrl( &#039;?revision=&#039; + 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 || &#039;revision-php&#039; !== window.adminpage ) {
			return;
		}

		state = new revisions.model.FrameState({
			initialDiffState: {
				// wp_localize_script doesn&#039;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 === &#039;1&#039; )
			},
			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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