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