Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1175 insertions, 0 deletions

diff --git a/wp-admin/js/revisions.js b/wp-admin/js/revisions.js
new file mode 100644
index 0000000..83c2641
--- /dev/null
+++ b/wp-admin/js/revisions.js
@@ -0,0 +1,1175 @@
+/**
+ * @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));