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/* global isRtl */
/**
 * @file Revisions interface functions, Backbone classes and
 * the revisions.php document.ready bootstrap.
 *
 */

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));

Nama File / Folder	Size	Action
widgets	--	NONE
accordion.js	2.85KB	Edit File Delete File Rename
accordion.min.js	0.815KB	Edit File Delete File Rename
code-editor.js	11.179KB	Edit File Delete File Rename
code-editor.min.js	3.095KB	Edit File Delete File Rename
color-picker.js	9.954KB	Edit File Delete File Rename
color-picker.min.js	3.438KB	Edit File Delete File Rename
comment.js	2.723KB	Edit File Delete File Rename
comment.min.js	1.218KB	Edit File Delete File Rename
common.min.js	15.06KB	Edit File Delete File Rename
custom-background.js	3.285KB	Edit File Delete File Rename
custom-background.min.js	1.121KB	Edit File Delete File Rename
customize-controls.js	282.27KB	Edit File Delete File Rename
customize-controls.min.js	109.172KB	Edit File Delete File Rename
customize-nav-menus.js	104.909KB	Edit File Delete File Rename
customize-nav-menus.min.js	45.419KB	Edit File Delete File Rename
customize-widgets.js	68.702KB	Edit File Delete File Rename
customize-widgets.min.js	27.724KB	Edit File Delete File Rename
dashboard.js	16.196KB	Edit File Delete File Rename
dashboard.min.js	6.901KB	Edit File Delete File Rename
edit-comments.js	27.301KB	Edit File Delete File Rename
edit-comments.min.js	14.586KB	Edit File Delete File Rename
editor-expand.js	41.843KB	Edit File Delete File Rename
editor.js	44.335KB	Edit File Delete File Rename
editor.min.js	13.103KB	Edit File Delete File Rename
farbtastic.js	7.509KB	Edit File Delete File Rename
gallery.js	5.42KB	Edit File Delete File Rename
image-edit.js	27.807KB	Edit File Delete File Rename
image-edit.min.js	9.525KB	Edit File Delete File Rename
inline-edit-post.js	16.033KB	Edit File Delete File Rename
inline-edit-post.min.js	7.096KB	Edit File Delete File Rename
inline-edit-tax.js	7.415KB	Edit File Delete File Rename
inline-edit-tax.min.js	2.749KB	Edit File Delete File Rename
iris.min.js	23.055KB	Edit File Delete File Rename
language-chooser.js	0.61KB	Edit File Delete File Rename
language-chooser.min.js	0.365KB	Edit File Delete File Rename
link.js	2.194KB	Edit File Delete File Rename
media-gallery.js	1.151KB	Edit File Delete File Rename
media-gallery.min.js	0.524KB	Edit File Delete File Rename
media-upload.js	1.938KB	Edit File Delete File Rename
media-upload.min.js	1.126KB	Edit File Delete File Rename
media.js	5.116KB	Edit File Delete File Rename
media.min.js	1.83KB	Edit File Delete File Rename
nav-menu.js	41.266KB	Edit File Delete File Rename
nav-menu.min.js	20.628KB	Edit File Delete File Rename
password-strength-meter.js	2.351KB	Edit File Delete File Rename
plugin-install.js	6.8KB	Edit File Delete File Rename
plugin-install.min.js	2.346KB	Edit File Delete File Rename
post.js	36.533KB	Edit File Delete File Rename
post.min.js	17.948KB	Edit File Delete File Rename
postbox.js	11.629KB	Edit File Delete File Rename
postbox.min.js	4.094KB	Edit File Delete File Rename
revisions.js	32.962KB	Edit File Delete File Rename
set-post-thumbnail.min.js	0.513KB	Edit File Delete File Rename
svg-painter.js	5.355KB	Edit File Delete File Rename
tags-box.js	6.726KB	Edit File Delete File Rename
tags-box.min.js	3.089KB	Edit File Delete File Rename
tags-suggest.js	5.072KB	Edit File Delete File Rename
tags-suggest.min.js	2.122KB	Edit File Delete File Rename
tags.js	4.377KB	Edit File Delete File Rename
tags.min.js	1.671KB	Edit File Delete File Rename
theme-plugin-editor.js	23.664KB	Edit File Delete File Rename
theme-plugin-editor.min.js	10.848KB	Edit File Delete File Rename
theme.js	53.09KB	Edit File Delete File Rename
theme.min.js	26.053KB	Edit File Delete File Rename
updates.js	79.173KB	Edit File Delete File Rename
updates.min.js	34.91KB	Edit File Delete File Rename
user-profile.js	12.22KB	Edit File Delete File Rename
user-profile.min.js	6.21KB	Edit File Delete File Rename
user-suggest.js	1.045KB	Edit File Delete File Rename
user-suggest.min.js	0.663KB	Edit File Delete File Rename
widgets.js	21.502KB	Edit File Delete File Rename
widgets.min.js	11.856KB	Edit File Delete File Rename
word-count.js	7.58KB	Edit File Delete File Rename
word-count.min.js	1.473KB	Edit File Delete File Rename
wp-fullscreen-stub.js	0.668KB	Edit File Delete File Rename
wp-fullscreen-stub.min.js	0.323KB	Edit File Delete File Rename
xfn.min.js	3.422KB	Edit File Delete File Rename