separate model from view: blur method, #814

phetsims · Jul 4, 2018 · ccc6bf4 · ccc6bf4
1 parent df8d387
commit ccc6bf4
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diff --git a/js/accessibility/Accessibility.js b/js/accessibility/Accessibility.js
@@ -574,7 +574,10 @@ define( function( require ) {
          */
         blur: function() {
           if ( this._accessibleInstances.length > 0 ) {
-            this._accessibleInstances[ 0 ].peer.primarySibling.blur();
+            assert && assert( this._accessibleInstances.length === 1, 'blur() unsupported for Nodes using DAG, accessible content is not unique' );
+            var peer = this._accessibleInstances[ 0 ].peer;
+            assert && assert( peer, 'must have a peer to blur' );
+            peer.blur();
           }
           this.interruptAccessibleInput(); // interrupt any a11y listeners that attached to this Node
         },

diff --git a/js/accessibility/AccessiblePeer.js b/js/accessibility/AccessiblePeer.js
@@ -299,6 +299,14 @@ define( function( require ) {
       this.primarySibling.focus();
     },
 
+    /**
+     * Blur the primary sibling of the peer.
+     */
+    blur: function() {
+      assert && assert( this.primarySibling, 'must have a primary sibling to blur' );
+      this.primarySibling.blur();
+    },
+
 
     /**
      * Removes external references from this peer, and places it in the pool.