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<title>[22477] trunk/wp-includes/js: Media JS: Add JIT composite library creation/destruction to states to allow for dynamically excluded Attachment models.</title>
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<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/22477">22477</a></dd>
<dt>Author</dt> <dd>koopersmith</dd>
<dt>Date</dt> <dd>2012-11-09 01:23:20 +0000 (Fri, 09 Nov 2012)</dd>
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<h3>Log Message</h3>
<pre>Media JS: Add JIT composite library creation/destruction to states to allow for dynamically excluded Attachment models. see <a href="http://core.trac.wordpress.org/ticket/21390">#21390</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkwpincludesjsmediamodelsjs">trunk/wp-includes/js/media-models.js</a></li>
<li><a href="#trunkwpincludesjsmediaviewsjs">trunk/wp-includes/js/media-views.js</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkwpincludesjsmediamodelsjs"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/js/media-models.js (22476 => 22477)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/js/media-models.js        2012-11-09 00:16:30 UTC (rev 22476)
+++ trunk/wp-includes/js/media-models.js        2012-11-09 01:23:20 UTC (rev 22477)
</span><span class="lines">@@ -741,16 +741,29 @@
</span><span class="cx"> 
</span><span class="cx">                 observe: function( attachments, options ) {
</span><span class="cx">                         var silent = options &amp;&amp; options.silent;
</span><ins>+                        this.observers = this.observers || [];
+                        this.observers.push( attachments );
</ins><span class="cx"> 
</span><span class="cx">                         attachments.on( 'add remove',  silent ? this._evaluateSilentHandler : this._evaluateHandler, this );
</span><span class="cx">                         attachments.on( 'reset',  silent ? this._evaluateAllSilentHandler : this._evaluateAllHandler, this );
</span><span class="cx"> 
</span><span class="cx">                         this.evaluateAll( attachments, options );
</span><ins>+                        return this;
</ins><span class="cx">                 },
</span><span class="cx"> 
</span><span class="cx">                 unobserve: function( attachments ) {
</span><del>-                        attachments.off( 'add remove', this._evaluateHandler, this );
-                        attachments.off( 'reset', this._evaluateAllHandler, this );
</del><ins>+                        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;
</ins><span class="cx">                 },
</span><span class="cx"> 
</span><span class="cx">                 _evaluateHandler: function( attachment, attachments, options ) {
</span></span></pre></div>
<a id="trunkwpincludesjsmediaviewsjs"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/js/media-views.js (22476 => 22477)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/js/media-views.js        2012-11-09 00:16:30 UTC (rev 22476)
+++ trunk/wp-includes/js/media-views.js        2012-11-09 01:23:20 UTC (rev 22477)
</span><span class="lines">@@ -291,6 +291,11 @@
</span><span class="cx">                 activate: function() {
</span><span class="cx">                         var selection = this.get('selection');
</span><span class="cx"> 
</span><ins>+                        this._excludeStateLibrary();
+                        this.buildComposite();
+                        this.on( 'change:library change:exclude', this.buildComposite, this );
+                        this.on( 'change:excludeState', this._excludeState, this );
+
</ins><span class="cx">                         // If we're in a workflow that supports multiple attachments,
</span><span class="cx">                         // automatically select any uploading attachments.
</span><span class="cx">                         if ( this.get('multiple') )
</span><span class="lines">@@ -306,6 +311,10 @@
</span><span class="cx">                 },
</span><span class="cx"> 
</span><span class="cx">                 deactivate: function() {
</span><ins>+                        this.off( 'change:library change:exclude', this.buildComposite, this );
+                        this.off( 'change:excludeState', this._excludeState, this );
+                        this.destroyComposite();
+
</ins><span class="cx">                         wp.Uploader.queue.off( 'add', this.selectUpload, this );
</span><span class="cx"> 
</span><span class="cx">                         // Unbind all event handlers that use this state as the context
</span><span class="lines">@@ -375,6 +384,72 @@
</span><span class="cx">                         }
</span><span class="cx"> 
</span><span class="cx">                         return this;
</span><ins>+                },
+
+                buildComposite: function() {
+                        var original = this.get('_library'),
+                                exclude = this.get('exclude'),
+                                composite;
+
+                        this.destroyComposite();
+                        if ( ! this.get('exclude') )
+                                return;
+
+                        // Remember the state's original library.
+                        if ( ! original )
+                                this.set( '_library', original = this.get('library') );
+
+                        // Create a composite library in its place.
+                        composite = new media.model.Composite( null, {
+                                props: _.pick( original.props.toJSON(), 'order', 'orderby' )
+                        });
+
+                        // Accepts attachments that exist in the original library and
+                        // that do not exist in the excluded library.
+                        composite.validator = function( attachment ) {
+                                return !! original.getByCid( attachment.cid ) &amp;&amp; ! exclude.getByCid( attachment.cid );
+                        };
+
+                        composite.observe( original ).observe( exclude );
+
+                        // When `more()` is triggered on the composite collection,
+                        // pass the command over to the `original`, which will
+                        // populate the query.
+                        composite.more = _.bind( original.more, original );
+
+                        this.set( 'library', composite );
+                },
+
+                destroyComposite: function() {
+                        var composite = this.get('library'),
+                                original = this.get('_library');
+
+                        if ( ! original )
+                                return;
+
+                        composite.unobserve();
+                        this.set( 'library', original );
+                        this.unset('_library');
+                },
+
+                _excludeState: function() {
+                        var current = this.get('excludeState'),
+                                previous = this.previous('excludeState');
+
+                        if ( previous )
+                                this.frame.get( previous ).off( 'change:library', this._excludeStateLibrary, this );
+
+                        if ( current )
+                                this.frame.get( previous ).on( 'change:library', this._excludeStateLibrary, this );
+                },
+
+                _excludeStateLibrary: function() {
+                        var current = this.get('excludeState');
+
+                        if ( ! current )
+                                return;
+
+                        this.set( 'exclude', this.frame.get( current ).get('library') );
</ins><span class="cx">                 }
</span><span class="cx">         });
</span><span class="cx"> 
</span><span class="lines">@@ -659,57 +734,20 @@
</span><span class="cx"> 
</span><span class="cx">                                 new media.controller.Library( _.defaults({
</span><span class="cx">                                         id:      'gallery-library',
</span><del>-                                        library: media.query({ type: 'image' })
</del><ins>+                                        library: media.query({ type: 'image' }),
+                                        excludeState: 'gallery-edit'
</ins><span class="cx">                                 }, gallery ) ),
</span><span class="cx"> 
</span><span class="cx">                                 new media.controller.Upload( _.defaults({
</span><del>-                                        id: 'gallery-upload'
</del><ins>+                                        id: 'gallery-upload',
+                                        excludeState: 'gallery-edit'
</ins><span class="cx">                                 }, gallery ) )
</span><span class="cx">                         ]);
</span><span class="cx"> 
</span><del>-                        this.get('gallery-edit').on( 'change:library', this.updateGalleryLibraries, this ).set({
-                                library: options.selection
-                        });
-
</del><span class="cx">                         // Set the default state.
</span><span class="cx">                         this.state( options.state );
</span><span class="cx">                 },
</span><span class="cx"> 
</span><del>-                updateGalleryLibraries: function() {
-                        var editLibrary = this.get('gallery-edit').get('library');
-
-                        _.each(['gallery-library','gallery-upload'], function( id ) {
-                                var state = this.get( id ),
-                                        original = state.get('_library'),
-                                        composite;
-
-                                // Remember the state's original library.
-                                if ( ! original )
-                                        state.set( '_library', original = state.get('library') );
-
-                                // Create a composite library in its place.
-                                composite = new media.model.Composite( null, {
-                                        props: _.pick( original.props.toJSON(), 'order', 'orderby' )
-                                });
-
-                                // Accepts attachments that exist in the original library and
-                                // that do not exist in the state's library.
-                                composite.validator = function( attachment ) {
-                                        return !! original.getByCid( attachment.cid ) &amp;&amp; ! editLibrary.getByCid( attachment.cid );
-                                };
-
-                                composite.observe( original );
-                                composite.observe( editLibrary );
-
-                                // When `more()` is triggered on the composite collection,
-                                // pass the command over to the `original`, which will
-                                // populate the query.
-                                composite.more = _.bind( original.more, original );
-
-                                state.set( 'library', composite );
-                        }, this );
-                },
-
</del><span class="cx">                 // Menus
</span><span class="cx">                 mainMenu: function() {
</span><span class="cx">                         this.menu.view( new media.view.Menu({
</span></span></pre>
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