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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 var FocusManager = cr.ui.FocusManager;
      6 
      7 /**
      8  * A history-specific FocusManager implementation, which ensures that elements
      9  * "background" pages (i.e., those in a dialog that is not the topmost overlay)
     10  * do not receive focus.
     11  * @constructor
     12  */
     13 function HistoryFocusManager() {
     14 }
     15 
     16 cr.addSingletonGetter(HistoryFocusManager);
     17 
     18 HistoryFocusManager.prototype = {
     19   __proto__: FocusManager.prototype,
     20 
     21   /** @override */
     22   getFocusParent: function() {
     23     return document.querySelector('#overlay .showing') ||
     24         document.querySelector('menu:not([hidden])') ||
     25         $('history-page');
     26   },
     27 };
     28