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<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/22335">22335</a></dd>
<dt>Author</dt> <dd>koopersmith</dd>
<dt>Date</dt> <dd>2012-10-30 23:15:16 +0000 (Tue, 30 Oct 2012)</dd>
</dl>

<h3>Log Message</h3>
<pre>Media JS: Improve handling of single attachments in selections.

* Adds `wp.media.model.Selection.single()` to specify a single item used in a multi-item selection.
* Fixes a bug where the `details` class would not be removed when &quot;Clear Selection&quot; was clicked.

see <a href="http://core.trac.wordpress.org/ticket/21390">#21390</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkwpincludescssmediaviewscss">trunk/wp-includes/css/media-views.css</a></li>
<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="trunkwpincludescssmediaviewscss"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/css/media-views.css (22334 => 22335)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/css/media-views.css        2012-10-30 22:58:31 UTC (rev 22334)
+++ trunk/wp-includes/css/media-views.css        2012-10-30 23:15:16 UTC (rev 22335)
</span><span class="lines">@@ -244,7 +244,6 @@
</span><span class="cx">         text-shadow: 0 1px 0 rgba( 0, 0, 0, 0.5 );
</span><span class="cx">         background: #777;
</span><span class="cx">         border: 1px solid #fff;
</span><del>-        /*border-width: 0 1px 1px 0;*/
</del><span class="cx">         border-width: 0 0 1px 1px;
</span><span class="cx">         box-shadow: -1px 1px 0 rgba( 0, 0, 0, 0.1 );
</span><span class="cx"> }
</span></span></pre></div>
<a id="trunkwpincludesjsmediamodelsjs"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/js/media-models.js (22334 => 22335)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/js/media-models.js        2012-10-30 22:58:31 UTC (rev 22334)
+++ trunk/wp-includes/js/media-models.js        2012-10-30 23:15:16 UTC (rev 22335)
</span><span class="lines">@@ -622,6 +622,11 @@
</span><span class="cx">                 initialize: function( models, options ) {
</span><span class="cx">                         Attachments.prototype.initialize.apply( this, arguments );
</span><span class="cx">                         this.multiple = options &amp;&amp; options.multiple;
</span><ins>+
+                        // 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 ) );
</ins><span class="cx">                 },
</span><span class="cx"> 
</span><span class="cx">                 // Override the selection's add method.
</span><span class="lines">@@ -638,14 +643,16 @@
</span><span class="cx"> 
</span><span class="cx">                 // Removes all models from the selection.
</span><span class="cx">                 clear: function( options ) {
</span><del>-                        return this.remove( this.models, options );
</del><ins>+                        this.remove( this.models, options ).single();
+                        return this;
</ins><span class="cx">                 },
</span><span class="cx"> 
</span><span class="cx">                 // Override the selection's reset method.
</span><span class="cx">                 // Always direct items through add and remove,
</span><span class="cx">                 // as we need them to fire.
</span><span class="cx">                 reset: function( models, options ) {
</span><del>-                        return this.clear( options ).add( models, options );
</del><ins>+                        this.clear( options ).add( models, options ).single();
+                        return this;
</ins><span class="cx">                 },
</span><span class="cx"> 
</span><span class="cx">                 // Create selection.has, which determines if a model
</span><span class="lines">@@ -653,6 +660,31 @@
</span><span class="cx">                 // instead of direct comparison.
</span><span class="cx">                 has: function( attachment ) {
</span><span class="cx">                         return !! ( this.getByCid( attachment.cid ) || this.get( attachment.id ) );
</span><ins>+                },
+
+                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 &amp;&amp; ! this.has( this._single ) )
+                                delete this._single;
+
+                        this._single = this._single || this.last();
+
+                        // If single has changed, fire an event.
+                        if ( this._single !== previous ) {
+                                if ( this._single )
+                                        this._single.trigger( 'selection:single', this._single, this );
+                                if ( previous )
+                                        previous.trigger( 'selection:unsingle', previous, this );
+                        }
+
+                        // Return the single model, or the last model as a fallback.
+                        return this._single;
</ins><span class="cx">                 }
</span><span class="cx">         });
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkwpincludesjsmediaviewsjs"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/js/media-views.js (22334 => 22335)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/js/media-views.js        2012-10-30 22:58:31 UTC (rev 22334)
+++ trunk/wp-includes/js/media-views.js        2012-10-30 23:15:16 UTC (rev 22335)
</span><span class="lines">@@ -212,7 +212,7 @@
</span><span class="cx">                 },
</span><span class="cx"> 
</span><span class="cx">                 details: function( options ) {
</span><del>-                        var model = this.get('details'),
</del><ins>+                        var model = this.get('selection').single(),
</ins><span class="cx">                                 view;
</span><span class="cx"> 
</span><span class="cx">                         if ( model ) {
</span><span class="lines">@@ -232,34 +232,18 @@
</span><span class="cx">                 },
</span><span class="cx"> 
</span><span class="cx">                 toggleSelection: function( model ) {
</span><del>-                        var details = this.get('details'),
-                                selection = this.get('selection'),
-                                selected = selection.has( model );
</del><ins>+                        var selection = this.get('selection');
</ins><span class="cx"> 
</span><del>-                        if ( ! selection )
-                                return;
-
-                        if ( ! selected )
-                                selection.add( model );
-
-                        // If the model is not the same as the details model,
-                        // it now becomes the details model. If the model is
-                        // in the selection, it is not removed.
-                        if ( details !== model ) {
-                                this.set( 'details', model );
-                                return;
</del><ins>+                        if ( selection.has( model ) ) {
+                                // If the model is the single model, remove it.
+                                // If it is not the same as the single model,
+                                // it now becomes the single model.
+                                selection[ selection.single() === model ? 'remove' : 'single' ]( model );
+                        } else {
+                                selection.add( model ).single();
</ins><span class="cx">                         }
</span><span class="cx"> 
</span><del>-                        // The model is the details model.
-                        // Removed it from the selection.
-                        selection.remove( model );
-
-                        // Show the last selected item, or clear the details view.
-                        if ( selection.length )
-                                this.set( 'details', selection.last() );
-                        else
-                                this.unset('details');
-
</del><ins>+                        return this;
</ins><span class="cx">                 }
</span><span class="cx">         });
</span><span class="cx"> 
</span><span class="lines">@@ -1087,14 +1071,14 @@
</span><span class="cx">                                 this.select();
</span><span class="cx"> 
</span><span class="cx">                         // Update the model's details view.
</span><del>-                        this.controller.state().on( 'change:details', this.details, this );
</del><ins>+                        this.model.on( 'selection:single selection:unsingle', this.details, this );
</ins><span class="cx">                         this.details();
</span><span class="cx"> 
</span><span class="cx">                         return this;
</span><span class="cx">                 },
</span><span class="cx"> 
</span><span class="cx">                 destroy: function() {
</span><del>-                        this.controller.state().off( 'change:details', this.details, this );
</del><ins>+                        this.model.off( 'single', this.details, this );
</ins><span class="cx">                 },
</span><span class="cx"> 
</span><span class="cx">                 progress: function() {
</span><span class="lines">@@ -1136,8 +1120,14 @@
</span><span class="cx">                         this.$el.removeClass('selected');
</span><span class="cx">                 },
</span><span class="cx"> 
</span><del>-                details: function() {
-                        var details = this.controller.state().get('details');
</del><ins>+                details: function( model, collection ) {
+                        var selection = this.controller.state().get('selection'),
+                                details;
+
+                        if ( selection !== collection )
+                                return;
+
+                        details = selection.single();
</ins><span class="cx">                         this.$el.toggleClass( 'details', details === this.model );
</span><span class="cx">                 },
</span><span class="cx"> 
</span></span></pre>
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