Implements a focus manager for the extensions page.

chrome/browser/resources/shared/js/cr/ui/overlay.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview Provides dialog-like behaviors for the tracing UI.
  */
 cr.define('cr.ui.overlay', function() {
 
   /**
    * Gets the top, visible overlay. It makes the assumption that if multiple
    * overlays are visible, the last in the byte order is topmost.
    * TODO(estade): rely on aria-visibility instead?
    * @return {HTMLElement} The overlay.
    */
   function getTopOverlay() {
     var overlays = document.querySelectorAll('.overlay:not([hidden])');
     return overlays[overlays.length - 1];
   }
 
   /**
    * Makes initializations which must hook at the document level.
    */
   function globalInitialization() {
-    // Listen to focus events and make sure focus doesn't move outside of a
-    // visible overlay .page.
-    document.addEventListener('focus', function(e) {
-      // Only run this event handler if there is no FocusManager.
-      // TODO(khorimoto): Remove this function once FocusManager can be used
-      // to manage focus on other pages besides the Settings page.
-      // (https://code.google.com/p/chromium/issues/detail?id=127681)
-      var focusManagerExists = options && options.OptionsFocusManager;
-      if (focusManagerExists)
-        return;
-
-      var overlay = getTopOverlay();
-      var page = overlay ? overlay.querySelector('.page:not([hidden])') : null;
-      if (!page || page.contains(e.target))
-        return;
-
-      var focusElement = page.querySelector('button, input, list, select, a');
-      if (focusElement)
-        focusElement.focus();
-    }, true);
-
     // Close the overlay on escape.
     document.addEventListener('keydown', function(e) {
       if (e.keyCode == 27) {  // Escape
         var overlay = getTopOverlay();
         if (!overlay)
           return;
 
         cr.dispatchSimpleEvent(overlay, 'cancelOverlay');
       }
     });
@@ skipping 57 matching lines @@
   }
 
   return {
     globalInitialization: globalInitialization,
     setupOverlay: setupOverlay,
   };
 });
 
 document.addEventListener('DOMContentLoaded',
                           cr.ui.overlay.globalInitialization);