Respect policy for list of startup pages

chrome/browser/resources/options2/startup_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.
 
 cr.define('options', function() {
   const ArrayDataModel = cr.ui.ArrayDataModel;
   const OptionsPage = options.OptionsPage;
   const SettingsDialog = options.SettingsDialog;
 
   /**
@@ skipping 15 matching lines @@
   StartupOverlay.prototype = {
     __proto__: SettingsDialog.prototype,
 
     /**
      * An autocomplete list that can be attached to a text field during editing.
      * @type {HTMLElement}
      * @private
      */
     autocompleteList_: null,
 
+    startup_pages_pref_: {
+      'name': 'session.urls_to_restore_on_startup',
+      'disabled': false
+    },
+
     /**
      * Initialize the page.
      */
     initializePage: function() {
       SettingsDialog.prototype.initializePage.call(this);
 
       var self = this;
 
       var startupPagesList = $('startupPagesList');
       options.browser_options.StartupPageList.decorate(startupPagesList);
       startupPagesList.autoExpands = true;
 
       $('startupUseCurrentButton').onclick = function(event) {
         chrome.send('setStartupPagesToCurrentPages');
       };
 
+      Preferences.getInstance().addEventListener(
+          this.startup_pages_pref_.name,
+          this.handleStartupPageListChange_.bind(this));
+
       var suggestionList = new cr.ui.AutocompleteList();
       suggestionList.autoExpands = true;
       suggestionList.suggestionUpdateRequestCallback =
           this.requestAutocompleteSuggestions_.bind(this);
       $('startup-overlay').appendChild(suggestionList);
       this.autocompleteList_ = suggestionList;
       startupPagesList.autocompleteList = suggestionList;
     },
 
     /** @inheritDoc */
     handleConfirm: function() {
       SettingsDialog.prototype.handleConfirm.call(this);
       chrome.send('commitStartupPrefChanges');
     },
 
     /** @inheritDoc */
     handleCancel: function() {
       SettingsDialog.prototype.handleCancel.call(this);
       chrome.send('cancelStartupPrefChanges');
     },
 
     /**
+     * Sets the enabled state of the custom startup page list controls
+     * based on the current startup radio button selection.
+     * @private
+     */
+    updateCustomStartupPageControlStates_: function() {
+      var disable = this.startup_pages_pref_.disabled;
+      var startupPagesList = $('startupPagesList');
+      startupPagesList.disabled = disable;
+      startupPagesList.setAttribute('tabindex', disable ? -1 : 0);
+      // Explicitly set disabled state for input text elements.
+      var inputs = startupPagesList.querySelectorAll("input[type='text']");
+      for (var i = 0; i < inputs.length; i++)
+        inputs[i].disabled = disable;
+      $('startupUseCurrentButton').disabled = disable;
+    },
+
+    /**
+     * Handles change events of the preference
+     * 'session.urls_to_restore_on_startup'.
+     * @param {event} preference changed event.
+     * @private
+     */
+    handleStartupPageListChange_: function(event) {
+      this.startup_pages_pref_.disabled = event.value['disabled'];
+      this.updateCustomStartupPageControlStates_();
+    },
+
+    /**
      * Updates the startup pages list with the given entries.
      * @param {Array} pages List of startup pages.
      * @private
      */
     updateStartupPages_: function(pages) {
       var model = new ArrayDataModel(pages);
       // Add a "new page" row.
       model.push({
         'modelIndex': '-1'
       });
@@ skipping 37 matching lines @@
       var instance = StartupOverlay.getInstance();
       return instance[name + '_'].apply(instance, arguments);
     };
   });
 
   // Export
   return {
     StartupOverlay: StartupOverlay
   };
 });