--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/js/media-models.js Wed Nov 06 03:21:17 2013 +0000
@@ -0,0 +1,862 @@
+window.wp = window.wp || {};
+
+(function($){
+ var Attachment, Attachments, Query, compare, l10n, media;
+
+ /**
+ * wp.media( attributes )
+ *
+ * Handles the default media experience. Automatically creates
+ * and opens a media frame, and returns the result.
+ * Does nothing if the controllers do not exist.
+ *
+ * @param {object} attributes The properties passed to the main media controller.
+ * @return {object} A media workflow.
+ */
+ media = wp.media = function( attributes ) {
+ var MediaFrame = media.view.MediaFrame,
+ frame;
+
+ if ( ! MediaFrame )
+ return;
+
+ attributes = _.defaults( attributes || {}, {
+ frame: 'select'
+ });
+
+ if ( 'select' === attributes.frame && MediaFrame.Select )
+ frame = new MediaFrame.Select( attributes );
+ else if ( 'post' === attributes.frame && MediaFrame.Post )
+ frame = new MediaFrame.Post( attributes );
+
+ delete attributes.frame;
+
+ return frame;
+ };
+
+ _.extend( media, { model: {}, view: {}, controller: {}, frames: {} });
+
+ // Link any localized strings.
+ l10n = media.model.l10n = typeof _wpMediaModelsL10n === 'undefined' ? {} : _wpMediaModelsL10n;
+
+ // Link any settings.
+ media.model.settings = l10n.settings || {};
+ delete l10n.settings;
+
+ /**
+ * ========================================================================
+ * UTILITIES
+ * ========================================================================
+ */
+
+ /**
+ * A basic comparator.
+ *
+ * @param {mixed} a The primary parameter to compare.
+ * @param {mixed} b The primary parameter to compare.
+ * @param {string} ac The fallback parameter to compare, a's cid.
+ * @param {string} bc The fallback parameter to compare, b's cid.
+ * @return {number} -1: a should come before b.
+ * 0: a and b are of the same rank.
+ * 1: b should come before a.
+ */
+ compare = function( a, b, ac, bc ) {
+ if ( _.isEqual( a, b ) )
+ return ac === bc ? 0 : (ac > bc ? -1 : 1);
+ else
+ return a > b ? -1 : 1;
+ };
+
+ _.extend( media, {
+ /**
+ * media.template( id )
+ *
+ * Fetches a template by id.
+ * See wp.template() in `wp-includes/js/wp-util.js`.
+ */
+ template: wp.template,
+
+ /**
+ * media.post( [action], [data] )
+ *
+ * Sends a POST request to WordPress.
+ * See wp.ajax.post() in `wp-includes/js/wp-util.js`.
+ */
+ post: wp.ajax.post,
+
+ /**
+ * media.ajax( [action], [options] )
+ *
+ * Sends an XHR request to WordPress.
+ * See wp.ajax.send() in `wp-includes/js/wp-util.js`.
+ */
+ ajax: wp.ajax.send,
+
+ // Scales a set of dimensions to fit within bounding dimensions.
+ fit: function( dimensions ) {
+ var width = dimensions.width,
+ height = dimensions.height,
+ maxWidth = dimensions.maxWidth,
+ maxHeight = dimensions.maxHeight,
+ constraint;
+
+ // Compare ratios between the two values to determine which
+ // max to constrain by. If a max value doesn't exist, then the
+ // opposite side is the constraint.
+ if ( ! _.isUndefined( maxWidth ) && ! _.isUndefined( maxHeight ) ) {
+ constraint = ( width / height > maxWidth / maxHeight ) ? 'width' : 'height';
+ } else if ( _.isUndefined( maxHeight ) ) {
+ constraint = 'width';
+ } else if ( _.isUndefined( maxWidth ) && height > maxHeight ) {
+ constraint = 'height';
+ }
+
+ // If the value of the constrained side is larger than the max,
+ // then scale the values. Otherwise return the originals; they fit.
+ if ( 'width' === constraint && width > maxWidth ) {
+ return {
+ width : maxWidth,
+ height: Math.round( maxWidth * height / width )
+ };
+ } else if ( 'height' === constraint && height > maxHeight ) {
+ return {
+ width : Math.round( maxHeight * width / height ),
+ height: maxHeight
+ };
+ } else {
+ return {
+ width : width,
+ height: height
+ };
+ }
+ },
+
+ // Truncates a string by injecting an ellipsis into the middle.
+ // Useful for filenames.
+ truncate: function( string, length, replacement ) {
+ length = length || 30;
+ replacement = replacement || '…';
+
+ if ( string.length <= length )
+ return string;
+
+ return string.substr( 0, length / 2 ) + replacement + string.substr( -1 * length / 2 );
+ }
+ });
+
+
+ /**
+ * ========================================================================
+ * MODELS
+ * ========================================================================
+ */
+
+ /**
+ * wp.media.attachment
+ */
+ media.attachment = function( id ) {
+ return Attachment.get( id );
+ };
+
+ /**
+ * wp.media.model.Attachment
+ */
+ Attachment = media.model.Attachment = Backbone.Model.extend({
+ sync: function( method, model, options ) {
+ // If the attachment does not yet have an `id`, return an instantly
+ // rejected promise. Otherwise, all of our requests will fail.
+ if ( _.isUndefined( this.id ) )
+ return $.Deferred().rejectWith( this ).promise();
+
+ // Overload the `read` request so Attachment.fetch() functions correctly.
+ if ( 'read' === method ) {
+ options = options || {};
+ options.context = this;
+ options.data = _.extend( options.data || {}, {
+ action: 'get-attachment',
+ id: this.id
+ });
+ return media.ajax( options );
+
+ // Overload the `update` request so properties can be saved.
+ } else if ( 'update' === method ) {
+ // If we do not have the necessary nonce, fail immeditately.
+ if ( ! this.get('nonces') || ! this.get('nonces').update )
+ return $.Deferred().rejectWith( this ).promise();
+
+ options = options || {};
+ options.context = this;
+
+ // Set the action and ID.
+ options.data = _.extend( options.data || {}, {
+ action: 'save-attachment',
+ id: this.id,
+ nonce: this.get('nonces').update,
+ post_id: media.model.settings.post.id
+ });
+
+ // Record the values of the changed attributes.
+ if ( model.hasChanged() ) {
+ options.data.changes = {};
+
+ _.each( model.changed, function( value, key ) {
+ options.data.changes[ key ] = this.get( key );
+ }, this );
+ }
+
+ return media.ajax( options );
+
+ // Overload the `delete` request so attachments can be removed.
+ // This will permanently delete an attachment.
+ } else if ( 'delete' === method ) {
+ options = options || {};
+
+ if ( ! options.wait )
+ this.destroyed = true;
+
+ options.context = this;
+ options.data = _.extend( options.data || {}, {
+ action: 'delete-post',
+ id: this.id,
+ _wpnonce: this.get('nonces')['delete']
+ });
+
+ return media.ajax( options ).done( function() {
+ this.destroyed = true;
+ }).fail( function() {
+ this.destroyed = false;
+ });
+
+ // Otherwise, fall back to `Backbone.sync()`.
+ } else {
+ return Backbone.Model.prototype.sync.apply( this, arguments );
+ }
+ },
+
+ parse: function( resp, xhr ) {
+ if ( ! resp )
+ return resp;
+
+ // Convert date strings into Date objects.
+ resp.date = new Date( resp.date );
+ resp.modified = new Date( resp.modified );
+ return resp;
+ },
+
+ saveCompat: function( data, options ) {
+ var model = this;
+
+ // If we do not have the necessary nonce, fail immeditately.
+ if ( ! this.get('nonces') || ! this.get('nonces').update )
+ return $.Deferred().rejectWith( this ).promise();
+
+ return media.post( 'save-attachment-compat', _.defaults({
+ id: this.id,
+ nonce: this.get('nonces').update,
+ post_id: media.model.settings.post.id
+ }, data ) ).done( function( resp, status, xhr ) {
+ model.set( model.parse( resp, xhr ), options );
+ });
+ }
+ }, {
+ create: function( attrs ) {
+ return Attachments.all.push( attrs );
+ },
+
+ get: _.memoize( function( id, attachment ) {
+ return Attachments.all.push( attachment || { id: id } );
+ })
+ });
+
+ /**
+ * wp.media.model.Attachments
+ */
+ Attachments = media.model.Attachments = Backbone.Collection.extend({
+ model: Attachment,
+
+ initialize: function( models, options ) {
+ options = options || {};
+
+ this.props = new Backbone.Model();
+ this.filters = options.filters || {};
+
+ // Bind default `change` events to the `props` model.
+ this.props.on( 'change', this._changeFilteredProps, this );
+
+ this.props.on( 'change:order', this._changeOrder, this );
+ this.props.on( 'change:orderby', this._changeOrderby, this );
+ this.props.on( 'change:query', this._changeQuery, this );
+
+ // Set the `props` model and fill the default property values.
+ this.props.set( _.defaults( options.props || {} ) );
+
+ // Observe another `Attachments` collection if one is provided.
+ if ( options.observe )
+ this.observe( options.observe );
+ },
+
+ // Automatically sort the collection when the order changes.
+ _changeOrder: function( model, order ) {
+ if ( this.comparator )
+ this.sort();
+ },
+
+ // Set the default comparator only when the `orderby` property is set.
+ _changeOrderby: function( model, orderby ) {
+ // If a different comparator is defined, bail.
+ if ( this.comparator && this.comparator !== Attachments.comparator )
+ return;
+
+ if ( orderby && 'post__in' !== orderby )
+ this.comparator = Attachments.comparator;
+ else
+ delete this.comparator;
+ },
+
+ // If the `query` property is set to true, query the server using
+ // the `props` values, and sync the results to this collection.
+ _changeQuery: function( model, query ) {
+ if ( query ) {
+ this.props.on( 'change', this._requery, this );
+ this._requery();
+ } else {
+ this.props.off( 'change', this._requery, this );
+ }
+ },
+
+ _changeFilteredProps: function( model, options ) {
+ // If this is a query, updating the collection will be handled by
+ // `this._requery()`.
+ if ( this.props.get('query') )
+ return;
+
+ var changed = _.chain( model.changed ).map( function( t, prop ) {
+ var filter = Attachments.filters[ prop ],
+ term = model.get( prop );
+
+ if ( ! filter )
+ return;
+
+ if ( term && ! this.filters[ prop ] )
+ this.filters[ prop ] = filter;
+ else if ( ! term && this.filters[ prop ] === filter )
+ delete this.filters[ prop ];
+ else
+ return;
+
+ // Record the change.
+ return true;
+ }, this ).any().value();
+
+ if ( ! changed )
+ return;
+
+ // If no `Attachments` model is provided to source the searches
+ // from, then automatically generate a source from the existing
+ // models.
+ if ( ! this._source )
+ this._source = new Attachments( this.models );
+
+ this.reset( this._source.filter( this.validator, this ) );
+ },
+
+ validateDestroyed: false,
+
+ validator: function( attachment ) {
+ if ( ! this.validateDestroyed && attachment.destroyed )
+ return false;
+ return _.all( this.filters, function( filter, key ) {
+ return !! filter.call( this, attachment );
+ }, this );
+ },
+
+ validate: function( attachment, options ) {
+ var valid = this.validator( attachment ),
+ hasAttachment = !! this.get( attachment.cid );
+
+ if ( ! valid && hasAttachment )
+ this.remove( attachment, options );
+ else if ( valid && ! hasAttachment )
+ this.add( attachment, options );
+
+ return this;
+ },
+
+ validateAll: function( attachments, options ) {
+ options = options || {};
+
+ _.each( attachments.models, function( attachment ) {
+ this.validate( attachment, { silent: true });
+ }, this );
+
+ if ( ! options.silent )
+ this.trigger( 'reset', this, options );
+
+ return this;
+ },
+
+ observe: function( attachments ) {
+ this.observers = this.observers || [];
+ this.observers.push( attachments );
+
+ attachments.on( 'add change remove', this._validateHandler, this );
+ attachments.on( 'reset', this._validateAllHandler, this );
+ this.validateAll( attachments );
+ return this;
+ },
+
+ unobserve: function( attachments ) {
+ if ( attachments ) {
+ attachments.off( null, null, this );
+ this.observers = _.without( this.observers, attachments );
+
+ } else {
+ _.each( this.observers, function( attachments ) {
+ attachments.off( null, null, this );
+ }, this );
+ delete this.observers;
+ }
+
+ return this;
+ },
+
+ _validateHandler: function( attachment, attachments, options ) {
+ // If we're not mirroring this `attachments` collection,
+ // only retain the `silent` option.
+ options = attachments === this.mirroring ? options : {
+ silent: options && options.silent
+ };
+
+ return this.validate( attachment, options );
+ },
+
+ _validateAllHandler: function( attachments, options ) {
+ return this.validateAll( attachments, options );
+ },
+
+ mirror: function( attachments ) {
+ if ( this.mirroring && this.mirroring === attachments )
+ return this;
+
+ this.unmirror();
+ this.mirroring = attachments;
+
+ // Clear the collection silently. A `reset` event will be fired
+ // when `observe()` calls `validateAll()`.
+ this.reset( [], { silent: true } );
+ this.observe( attachments );
+
+ return this;
+ },
+
+ unmirror: function() {
+ if ( ! this.mirroring )
+ return;
+
+ this.unobserve( this.mirroring );
+ delete this.mirroring;
+ },
+
+ more: function( options ) {
+ var deferred = $.Deferred(),
+ mirroring = this.mirroring,
+ attachments = this;
+
+ if ( ! mirroring || ! mirroring.more )
+ return deferred.resolveWith( this ).promise();
+
+ // If we're mirroring another collection, forward `more` to
+ // the mirrored collection. Account for a race condition by
+ // checking if we're still mirroring that collection when
+ // the request resolves.
+ mirroring.more( options ).done( function() {
+ if ( this === attachments.mirroring )
+ deferred.resolveWith( this );
+ });
+
+ return deferred.promise();
+ },
+
+ hasMore: function() {
+ return this.mirroring ? this.mirroring.hasMore() : false;
+ },
+
+ parse: function( resp, xhr ) {
+ if ( ! _.isArray( resp ) )
+ resp = [resp];
+
+ return _.map( resp, function( attrs ) {
+ var id, attachment, newAttributes;
+
+ if ( attrs instanceof Backbone.Model ) {
+ id = attrs.get( 'id' );
+ attrs = attrs.attributes;
+ } else {
+ id = attrs.id;
+ }
+
+ attachment = Attachment.get( id );
+ newAttributes = attachment.parse( attrs, xhr );
+
+ if ( ! _.isEqual( attachment.attributes, newAttributes ) )
+ attachment.set( newAttributes );
+
+ return attachment;
+ });
+ },
+
+ _requery: function() {
+ if ( this.props.get('query') )
+ this.mirror( Query.get( this.props.toJSON() ) );
+ },
+
+ // If this collection is sorted by `menuOrder`, recalculates and saves
+ // the menu order to the database.
+ saveMenuOrder: function() {
+ if ( 'menuOrder' !== this.props.get('orderby') )
+ return;
+
+ // Removes any uploading attachments, updates each attachment's
+ // menu order, and returns an object with an { id: menuOrder }
+ // mapping to pass to the request.
+ var attachments = this.chain().filter( function( attachment ) {
+ return ! _.isUndefined( attachment.id );
+ }).map( function( attachment, index ) {
+ // Indices start at 1.
+ index = index + 1;
+ attachment.set( 'menuOrder', index );
+ return [ attachment.id, index ];
+ }).object().value();
+
+ if ( _.isEmpty( attachments ) )
+ return;
+
+ return media.post( 'save-attachment-order', {
+ nonce: media.model.settings.post.nonce,
+ post_id: media.model.settings.post.id,
+ attachments: attachments
+ });
+ }
+ }, {
+ comparator: function( a, b, options ) {
+ var key = this.props.get('orderby'),
+ order = this.props.get('order') || 'DESC',
+ ac = a.cid,
+ bc = b.cid;
+
+ a = a.get( key );
+ b = b.get( key );
+
+ if ( 'date' === key || 'modified' === key ) {
+ a = a || new Date();
+ b = b || new Date();
+ }
+
+ // If `options.ties` is set, don't enforce the `cid` tiebreaker.
+ if ( options && options.ties )
+ ac = bc = null;
+
+ return ( 'DESC' === order ) ? compare( a, b, ac, bc ) : compare( b, a, bc, ac );
+ },
+
+ filters: {
+ // Note that this client-side searching is *not* equivalent
+ // to our server-side searching.
+ search: function( attachment ) {
+ if ( ! this.props.get('search') )
+ return true;
+
+ return _.any(['title','filename','description','caption','name'], function( key ) {
+ var value = attachment.get( key );
+ return value && -1 !== value.search( this.props.get('search') );
+ }, this );
+ },
+
+ type: function( attachment ) {
+ var type = this.props.get('type');
+ return ! type || -1 !== type.indexOf( attachment.get('type') );
+ },
+
+ uploadedTo: function( attachment ) {
+ var uploadedTo = this.props.get('uploadedTo');
+ if ( _.isUndefined( uploadedTo ) )
+ return true;
+
+ return uploadedTo === attachment.get('uploadedTo');
+ }
+ }
+ });
+
+ Attachments.all = new Attachments();
+
+ /**
+ * wp.media.query
+ */
+ media.query = function( props ) {
+ return new Attachments( null, {
+ props: _.extend( _.defaults( props || {}, { orderby: 'date' } ), { query: true } )
+ });
+ };
+
+ /**
+ * wp.media.model.Query
+ *
+ * A set of attachments that corresponds to a set of consecutively paged
+ * queries on the server.
+ *
+ * Note: Do NOT change this.args after the query has been initialized.
+ * Things will break.
+ */
+ Query = media.model.Query = Attachments.extend({
+ initialize: function( models, options ) {
+ var allowed;
+
+ options = options || {};
+ Attachments.prototype.initialize.apply( this, arguments );
+
+ this.args = options.args;
+ this._hasMore = true;
+ this.created = new Date();
+
+ this.filters.order = function( attachment ) {
+ var orderby = this.props.get('orderby'),
+ order = this.props.get('order');
+
+ if ( ! this.comparator )
+ return true;
+
+ // We want any items that can be placed before the last
+ // item in the set. If we add any items after the last
+ // item, then we can't guarantee the set is complete.
+ if ( this.length ) {
+ return 1 !== this.comparator( attachment, this.last(), { ties: true });
+
+ // Handle the case where there are no items yet and
+ // we're sorting for recent items. In that case, we want
+ // changes that occurred after we created the query.
+ } else if ( 'DESC' === order && ( 'date' === orderby || 'modified' === orderby ) ) {
+ return attachment.get( orderby ) >= this.created;
+
+ // If we're sorting by menu order and we have no items,
+ // accept any items that have the default menu order (0).
+ } else if ( 'ASC' === order && 'menuOrder' === orderby ) {
+ return attachment.get( orderby ) === 0;
+ }
+
+ // Otherwise, we don't want any items yet.
+ return false;
+ };
+
+ // Observe the central `wp.Uploader.queue` collection to watch for
+ // new matches for the query.
+ //
+ // Only observe when a limited number of query args are set. There
+ // are no filters for other properties, so observing will result in
+ // false positives in those queries.
+ allowed = [ 's', 'order', 'orderby', 'posts_per_page', 'post_mime_type', 'post_parent' ];
+ if ( wp.Uploader && _( this.args ).chain().keys().difference( allowed ).isEmpty().value() )
+ this.observe( wp.Uploader.queue );
+ },
+
+ hasMore: function() {
+ return this._hasMore;
+ },
+
+ more: function( options ) {
+ var query = this;
+
+ if ( this._more && 'pending' === this._more.state() )
+ return this._more;
+
+ if ( ! this.hasMore() )
+ return $.Deferred().resolveWith( this ).promise();
+
+ options = options || {};
+ options.remove = false;
+
+ return this._more = this.fetch( options ).done( function( resp ) {
+ if ( _.isEmpty( resp ) || -1 === this.args.posts_per_page || resp.length < this.args.posts_per_page )
+ query._hasMore = false;
+ });
+ },
+
+ sync: function( method, model, options ) {
+ var args, fallback;
+
+ // Overload the read method so Attachment.fetch() functions correctly.
+ if ( 'read' === method ) {
+ options = options || {};
+ options.context = this;
+ options.data = _.extend( options.data || {}, {
+ action: 'query-attachments',
+ post_id: media.model.settings.post.id
+ });
+
+ // Clone the args so manipulation is non-destructive.
+ args = _.clone( this.args );
+
+ // Determine which page to query.
+ if ( -1 !== args.posts_per_page )
+ args.paged = Math.floor( this.length / args.posts_per_page ) + 1;
+
+ options.data.query = args;
+ return media.ajax( options );
+
+ // Otherwise, fall back to Backbone.sync()
+ } else {
+ fallback = Attachments.prototype.sync ? Attachments.prototype : Backbone;
+ return fallback.sync.apply( this, arguments );
+ }
+ }
+ }, {
+ defaultProps: {
+ orderby: 'date',
+ order: 'DESC'
+ },
+
+ defaultArgs: {
+ posts_per_page: 40
+ },
+
+ orderby: {
+ allowed: [ 'name', 'author', 'date', 'title', 'modified', 'uploadedTo', 'id', 'post__in', 'menuOrder' ],
+ valuemap: {
+ 'id': 'ID',
+ 'uploadedTo': 'parent',
+ 'menuOrder': 'menu_order ID'
+ }
+ },
+
+ propmap: {
+ 'search': 's',
+ 'type': 'post_mime_type',
+ 'perPage': 'posts_per_page',
+ 'menuOrder': 'menu_order',
+ 'uploadedTo': 'post_parent'
+ },
+
+ // Caches query objects so queries can be easily reused.
+ get: (function(){
+ var queries = [];
+
+ return function( props, options ) {
+ var args = {},
+ orderby = Query.orderby,
+ defaults = Query.defaultProps,
+ query;
+
+ // Remove the `query` property. This isn't linked to a query,
+ // this *is* the query.
+ delete props.query;
+
+ // Fill default args.
+ _.defaults( props, defaults );
+
+ // Normalize the order.
+ props.order = props.order.toUpperCase();
+ if ( 'DESC' !== props.order && 'ASC' !== props.order )
+ props.order = defaults.order.toUpperCase();
+
+ // Ensure we have a valid orderby value.
+ if ( ! _.contains( orderby.allowed, props.orderby ) )
+ props.orderby = defaults.orderby;
+
+ // Generate the query `args` object.
+ // Correct any differing property names.
+ _.each( props, function( value, prop ) {
+ if ( _.isNull( value ) )
+ return;
+
+ args[ Query.propmap[ prop ] || prop ] = value;
+ });
+
+ // Fill any other default query args.
+ _.defaults( args, Query.defaultArgs );
+
+ // `props.orderby` does not always map directly to `args.orderby`.
+ // Substitute exceptions specified in orderby.keymap.
+ args.orderby = orderby.valuemap[ props.orderby ] || props.orderby;
+
+ // Search the query cache for matches.
+ query = _.find( queries, function( query ) {
+ return _.isEqual( query.args, args );
+ });
+
+ // Otherwise, create a new query and add it to the cache.
+ if ( ! query ) {
+ query = new Query( [], _.extend( options || {}, {
+ props: props,
+ args: args
+ } ) );
+ queries.push( query );
+ }
+
+ return query;
+ };
+ }())
+ });
+
+ /**
+ * wp.media.model.Selection
+ *
+ * Used to manage a selection of attachments in the views.
+ */
+ media.model.Selection = Attachments.extend({
+ initialize: function( models, options ) {
+ Attachments.prototype.initialize.apply( this, arguments );
+ this.multiple = options && options.multiple;
+
+ // Refresh the `single` model whenever the selection changes.
+ // Binds `single` instead of using the context argument to ensure
+ // it receives no parameters.
+ this.on( 'add remove reset', _.bind( this.single, this, false ) );
+ },
+
+ // Override the selection's add method.
+ // If the workflow does not support multiple
+ // selected attachments, reset the selection.
+ add: function( models, options ) {
+ if ( ! this.multiple )
+ this.remove( this.models );
+
+ return Attachments.prototype.add.call( this, models, options );
+ },
+
+ single: function( model ) {
+ var previous = this._single;
+
+ // If a `model` is provided, use it as the single model.
+ if ( model )
+ this._single = model;
+
+ // If the single model isn't in the selection, remove it.
+ if ( this._single && ! this.get( this._single.cid ) )
+ delete this._single;
+
+ this._single = this._single || this.last();
+
+ // If single has changed, fire an event.
+ if ( this._single !== previous ) {
+ if ( previous ) {
+ previous.trigger( 'selection:unsingle', previous, this );
+
+ // If the model was already removed, trigger the collection
+ // event manually.
+ if ( ! this.get( previous.cid ) )
+ this.trigger( 'selection:unsingle', previous, this );
+ }
+ if ( this._single )
+ this._single.trigger( 'selection:single', this._single, this );
+ }
+
+ // Return the single model, or the last model as a fallback.
+ return this._single;
+ }
+ });
+
+ // Clean up. Prevents mobile browsers caching
+ $(window).on('unload', function(){
+ window.wp = null;
+ });
+
+}(jQuery));
\ No newline at end of file