Prevent focus from leaving Print Preview overlay controls.

BUG=276784

Review URL: https://codereview.chromium.org/400013003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284265 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/print_preview/print_preview.html

@@ -31,6 +31,7 @@
   <script src="chrome://resources/js/cr.js"></script>
   <script src="chrome://resources/js/cr/event_target.js"></script>
   <script src="chrome://resources/js/cr/ui.js"></script>
+  <script src="chrome://resources/js/cr/ui/focus_manager.js"></script>
   <script src="chrome://resources/js/cr/ui/focus_outline_manager.js"></script>
   <script src="chrome://resources/js/event_tracker.js"></script>
   <script src="chrome://resources/js/local_strings.js"></script>

chrome/browser/resources/print_preview/print_preview.js

@@ -7,6 +7,7 @@
 var localStrings = new LocalStrings(templateData);
 
 <include src="component.js"/>
+<include src="print_preview_focus_manager.js"/>
 
 cr.define('print_preview', function() {
   'use strict';
@@ -255,6 +256,7 @@ cr.define('print_preview', function() {
         this.setIsEnabled_(false);
       }
       this.nativeLayer_.startGetInitialSettings();
+      print_preview.PrintPreviewFocusManager.getInstance().initialize();
       cr.ui.FocusOutlineManager.forDocument(document);
     },
 

chrome/browser/resources/print_preview/print_preview_focus_manager.js

+// Copyright 2014 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.
+
+cr.define('print_preview', function() {
+  'use strict';
+
+  /**
+   * FocusManager implementation specialized for Print Preview, which ensures
+   * that Print Preview itself does not receive focus when an overlay is shown.
+   * @constructor
+   */
+  function PrintPreviewFocusManager() {
+  };
+
+  cr.addSingletonGetter(PrintPreviewFocusManager);
+
+  PrintPreviewFocusManager.prototype = {
+    __proto__: cr.ui.FocusManager.prototype,
+
+    /** @override */
+    getFocusParent: function() {
+      return document.querySelector('.overlay:not([hidden])') ||
+          document.body;
+    }
+  };
+
+  // Export
+  return {
+    PrintPreviewFocusManager: PrintPreviewFocusManager
+  };
+});