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wp-backbone.js
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/** * @output wp-includes/js/wp-backbone.js */ /** @namespace wp */ window.wp = window.wp || {}; (function ($) { /** * Create the WordPress Backbone namespace. * * @namespace wp.Backbone */ wp.Backbone = {}; /** * A backbone subview manager. * * @since 3.5.0 * @since 3.6.0 Moved wp.media.Views to wp.Backbone.Subviews. * * @memberOf wp.Backbone * * @class * * @param {wp.Backbone.View} view The main view. * @param {Array|Object} views The subviews for the main view. */ wp.Backbone.Subviews = function( view, views ) { this.view = view; this._views = _.isArray( views ) ? { '': views } : views || {}; }; wp.Backbone.Subviews.extend = Backbone.Model.extend; _.extend( wp.Backbone.Subviews.prototype, { /** * Fetches all of the subviews. * * @since 3.5.0 * * @return {Array} All the subviews. */ all: function() { return _.flatten( _.values( this._views ) ); }, /** * Fetches all subviews that match a given `selector`. * * If no `selector` is provided, it will grab all subviews attached * to the view's root. * * @since 3.5.0 * * @param {string} selector A jQuery selector. * * @return {Array} All the subviews that match the selector. */ get: function( selector ) { selector = selector || ''; return this._views[ selector ]; }, /** * Fetches the first subview that matches a given `selector`. * * If no `selector` is provided, it will grab the first subview attached to the * view's root. * * Useful when a selector only has one subview at a time. * * @since 3.5.0 * * @param {string} selector A jQuery selector. * * @return {Backbone.View} The view. */ first: function( selector ) { var views = this.get( selector ); return views && views.length ? views[0] : null; }, /** * Registers subview(s). * * Registers any number of `views` to a `selector`. * * When no `selector` is provided, the root selector (the empty string) * is used. `views` accepts a `Backbone.View` instance or an array of * `Backbone.View` instances. * * --- * * Accepts an `options` object, which has a significant effect on the * resulting behavior. * * `options.silent` - *boolean, `false`* * If `options.silent` is true, no DOM modifications will be made. * * `options.add` - *boolean, `false`* * Use `Views.add()` as a shortcut for setting `options.add` to true. * * By default, the provided `views` will replace any existing views * associated with the selector. If `options.add` is true, the provided * `views` will be added to the existing views. * * `options.at` - *integer, `undefined`* * When adding, to insert `views` at a specific index, use `options.at`. * By default, `views` are added to the end of the array. * * @since 3.5.0 * * @param {string} selector A jQuery selector. * @param {Array|Object} views The subviews for the main view. * @param {Object} options Options for call. If `options.silent` is true, * no DOM modifications will be made. Use * `Views.add()` as a shortcut for setting * `options.add` to true. If `options.add` is * true, the provided `views` will be added to * the existing views. When adding, to insert * `views` at a specific index, use `options.at`. * * @return {wp.Backbone.Subviews} The current Subviews instance. */ set: function( selector, views, options ) { var existing, next; if ( ! _.isString( selector ) ) { options = views; views = selector; selector = ''; } options = options || {}; views = _.isArray( views ) ? views : [ views ]; existing = this.get( selector ); next = views; if ( existing ) { if ( options.add ) { if ( _.isUndefined( options.at ) ) { next = existing.concat( views ); } else { next = existing; next.splice.apply( next, [ options.at, 0 ].concat( views ) ); } } else { _.each( next, function( view ) { view.__detach = true; }); _.each( existing, function( view ) { if ( view.__detach ) view.$el.detach(); else view.remove(); }); _.each( next, function( view ) { delete view.__detach; }); } } this._views[ selector ] = next; _.each( views, function( subview ) { var constructor = subview.Views || wp.Backbone.Subviews, subviews = subview.views = subview.views || new constructor( subview ); subviews.parent = this.view; subviews.selector = selector; }, this ); if ( ! options.silent ) this._attach( selector, views, _.extend({ ready: this._isReady() }, options ) ); return this; }, /** * Add subview(s) to existing subviews. * * An alias to `Views.set()`, which defaults `options.add` to true. * * Adds any number of `views` to a `selector`. * * When no `selector` is provided, the root selector (the empty string) * is used. `views` accepts a `Backbone.View` instance or an array of * `Backbone.View` instances. * * Uses `Views.set()` when setting `options.add` to `false`. * * Accepts an `options` object. By default, provided `views` will be * inserted at the end of the array of existing views. To insert * `views` at a specific index, use `options.at`. If `options.silent` * is true, no DOM modifications will be made. * * For more information on the `options` object, see `Views.set()`. * * @since 3.5.0 * * @param {string} selector A jQuery selector. * @param {Array|Object} views The subviews for the main view. * @param {Object} options Options for call. To insert `views` at a * specific index, use `options.at`. If * `options.silent` is true, no DOM modifications * will be made. * * @return {wp.Backbone.Subviews} The current subviews instance. */ add: function( selector, views, options ) { if ( ! _.isString( selector ) ) { options = views; views = selector; selector = ''; } return this.set( selector, views, _.extend({ add: true }, options ) ); }, /** * Removes an added subview. * * Stops tracking `views` registered to a `selector`. If no `views` are * set, then all of the `selector`'s subviews will be unregistered and * removed. * * Accepts an `options` object. If `options.silent` is set, `remove` * will *not* be triggered on the unregistered views. * * @since 3.5.0 * * @param {string} selector A jQuery selector. * @param {Array|Object} views The subviews for the main view. * @param {Object} options Options for call. If `options.silent` is set, * `remove` will *not* be triggered on the * unregistered views. * * @return {wp.Backbone.Subviews} The current Subviews instance. */ unset: function( selector, views, options ) { var existing; if ( ! _.isString( selector ) ) { options = views; views = selector; selector = ''; } views = views || []; if ( existing = this.get( selector ) ) { views = _.isArray( views ) ? views : [ views ]; this._views[ selector ] = views.length ? _.difference( existing, views ) : []; } if ( ! options || ! options.silent ) _.invoke( views, 'remove' ); return this; }, /** * Detaches all subviews. * * Helps to preserve all subview events when re-rendering the master * view. Used in conjunction with `Views.render()`. * * @since 3.5.0 * * @return {wp.Backbone.Subviews} The current Subviews instance. */ detach: function() { $( _.pluck( this.all(), 'el' ) ).detach(); return this; }, /** * Renders all subviews. * * Used in conjunction with `Views.detach()`. * * @since 3.5.0 * * @return {wp.Backbone.Subviews} The current Subviews instance. */ render: function() { var options = { ready: this._isReady() }; _.each( this._views, function( views, selector ) { this._attach( selector, views, options ); }, this ); this.rendered = true; return this; }, /** * Removes all subviews. * * Triggers the `remove()` method on all subviews. Detaches the master * view from its parent. Resets the internals of the views manager. * * Accepts an `options` object. If `options.silent` is set, `unset` * will *not* be triggered on the master view's parent. * * @since 3.6.0 * * @param {Object} options Options for call. * @param {boolean} options.silent If true, `unset` will *not* be triggered on * the master views' parent. * * @return {wp.Backbone.Subviews} The current Subviews instance. */ remove: function( options ) { if ( ! options || ! options.silent ) { if ( this.parent && this.parent.views ) this.parent.views.unset( this.selector, this.view, { silent: true }); delete this.parent; delete this.selector; } _.invoke( this.all(), 'remove' ); this._views = []; return this; }, /** * Replaces a selector's subviews * * By default, sets the `$target` selector's html to the subview `els`. * * Can be overridden in subclasses. * * @since 3.5.0 * * @param {string} $target Selector where to put the elements. * @param {*} els HTML or elements to put into the selector's HTML. * * @return {wp.Backbone.Subviews} The current Subviews instance. */ replace: function( $target, els ) { $target.html( els ); return this; }, /** * Insert subviews into a selector. * * By default, appends the subview `els` to the end of the `$target` * selector. If `options.at` is set, inserts the subview `els` at the * provided index. * * Can be overridden in subclasses. * * @since 3.5.0 * * @param {string} $target Selector where to put the elements. * @param {*} els HTML or elements to put at the end of the * $target. * @param {?Object} options Options for call. * @param {?number} options.at At which index to put the elements. * * @return {wp.Backbone.Subviews} The current Subviews instance. */ insert: function( $target, els, options ) { var at = options && options.at, $children; if ( _.isNumber( at ) && ($children = $target.children()).length > at ) $children.eq( at ).before( els ); else $target.append( els ); return this; }, /** * Triggers the ready event. * * Only use this method if you know what you're doing. For performance reasons, * this method does not check if the view is actually attached to the DOM. It's * taking your word for it. * * Fires the ready event on the current view and all attached subviews. * * @since 3.5.0 */ ready: function() { this.view.trigger('ready'); // Find all attached subviews, and call ready on them. _.chain( this.all() ).map( function( view ) { return view.views; }).flatten().where({ attached: true }).invoke('ready'); }, /** * Attaches a series of views to a selector. Internal. * * Checks to see if a matching selector exists, renders the views, * performs the proper DOM operation, and then checks if the view is * attached to the document. * * @since 3.5.0 * * @private * * @param {string} selector A jQuery selector. * @param {Array|Object} views The subviews for the main view. * @param {Object} options Options for call. * @param {boolean} options.add If true the provided views will be added. * * @return {wp.Backbone.Subviews} The current Subviews instance. */ _attach: function( selector, views, options ) { var $selector = selector ? this.view.$( selector ) : this.view.$el, managers; // Check if we found a location to attach the views. if ( ! $selector.length ) return this; managers = _.chain( views ).pluck('views').flatten().value(); // Render the views if necessary. _.each( managers, function( manager ) { if ( manager.rendered ) return; manager.view.render(); manager.rendered = true; }, this ); // Insert or replace the views. this[ options.add ? 'insert' : 'replace' ]( $selector, _.pluck( views, 'el' ), options ); /* * Set attached and trigger ready if the current view is already * attached to the DOM. */ _.each( managers, function( manager ) { manager.attached = true; if ( options.ready ) manager.ready(); }, this ); return this; }, /** * Determines whether or not the current view is in the DOM. * * @since 3.5.0 * * @private * * @return {boolean} Whether or not the current view is in the DOM. */ _isReady: function() { var node = this.view.el; while ( node ) { if ( node === document.body ) return true; node = node.parentNode; } return false; } }); wp.Backbone.View = Backbone.View.extend({ // The constructor for the `Views` manager. Subviews: wp.Backbone.Subviews, /** * The base view class. * * This extends the backbone view to have a build-in way to use subviews. This * makes it easier to have nested views. * * @since 3.5.0 * @since 3.6.0 Moved wp.media.View to wp.Backbone.View * * @constructs * @augments Backbone.View * * @memberOf wp.Backbone * * * @param {Object} options The options for this view. */ constructor: function( options ) { this.views = new this.Subviews( this, this.views ); this.on( 'ready', this.ready, this ); this.options = options || {}; Backbone.View.apply( this, arguments ); }, /** * Removes this view and all subviews. * * @since 3.5.0 * * @return {wp.Backbone.Subviews} The current Subviews instance. */ remove: function() { var result = Backbone.View.prototype.remove.apply( this, arguments ); // Recursively remove child views. if ( this.views ) this.views.remove(); return result; }, /** * Renders this view and all subviews. * * @since 3.5.0 * * @return {wp.Backbone.View} The current instance of the view. */ render: function() { var options; if ( this.prepare ) options = this.prepare(); this.views.detach(); if ( this.template ) { options = options || {}; this.trigger( 'prepare', options ); this.$el.html( this.template( options ) ); } this.views.render(); return this; }, /** * Returns the options for this view. * * @since 3.5.0 * * @return {Object} The options for this view. */ prepare: function() { return this.options; }, /** * Method that is called when the ready event is triggered. * * @since 3.5.0 */ ready: function() {} }); }(jQuery));
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