chrome/browser/resources/options/settings_banner.js

   1 // Copyright 2014 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 cr.define('options', function() {
   6
   7   /**
   8    * Base class for banners that appear at the top of the settings page.
   9    * @constructor
  10    */
  11   function SettingsBannerBase() {}
  12
  13   cr.addSingletonGetter(SettingsBannerBase);
  14
  15   SettingsBannerBase.prototype = {
  16     /**
  17      * Whether or not the banner has already been dismissed.
  18      *
  19      * This is needed because of the surprising ordering of asynchronous
  20      * JS<->native calls when the settings page is opened with specifying a
  21      * given sub-page, e.g. chrome://settings/AutomaticSettingsReset.
  22      *
  23      * In such a case, AutomaticSettingsResetOverlay's didShowPage(), which
  24      * calls our dismiss() method, would be called before the native Handlers'
  25      * InitalizePage() methods have an effect in the JS, which includes calling
  26      * our show() method. This would mean that the banner would be first
  27      * dismissed, then shown. We want to prevent this.
  28      *
  29      * @type {boolean}
  30      * @private
  31      */
  32     hadBeenDismissed_: false,
  33
  34     /**
  35      * Metric name to send when a show event occurs.
  36      * @protected
  37      */
  38     showMetricName: '',
  39
  40     /**
  41      * Name of the native callback invoked when the banner is dismised.
  42      * @protected
  43      */
  44     dismissNativeCallbackName: '',
  45
  46     /**
  47      * DOM element whose visibility is set when setVisibility_ is called.
  48      * @protected
  49      */
  50     visibilityDomElement: null,
  51
  52     /**
  53      * Called by the native code to show the banner if needed.
  54      * @protected
  55      */
  56     show: function() {
  57       if (!this.hadBeenDismissed_) {
  58         chrome.send('metricsHandler:recordAction', [this.showMetricName]);
  59         this.setVisibility_(true);
  60       }
  61     },
  62
  63     /**
  64      * Called when the banner should be closed as a result of something taking
  65      * place on the WebUI page, i.e. when its close button is pressed, or when
  66      * the confirmation dialog for the profile settings reset feature is opened.
  67      * @protected
  68      */
  69     dismiss: function() {
  70       chrome.send(this.dismissNativeCallbackName);
  71       this.hadBeenDismissed_ = true;
  72       this.setVisibility_(false);
  73     },
  74
  75     /**
  76      * Sets whether or not the reset profile settings banner shall be visible.
  77      * @param {boolean} show Whether or not to show the banner.
  78      * @private
  79      */
  80     setVisibility_: function(show) {
  81       this.visibilityDomElement.hidden = !show;
  82     },
  83   };
  84
  85   // Export
  86   return {
  87     SettingsBannerBase: SettingsBannerBase
  88   };
  89 });