chrome/browser/resources/quota_internals/message_dispatcher.js

   1 // Copyright (c) 2011 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 // require cr.js
   6 // require cr/event_target.js
   7 // require cr/util.js
   8
   9 /**
  10  * Bridge between the browser and the page.
  11  * In this file:
  12  *   * define EventTargets to receive message from the browser,
  13  *   * dispatch browser messages to EventTarget,
  14  *   * define interface to request data to the browser.
  15  */
  16
  17 cr.define('cr.quota', function() {
  18   'use strict';
  19
  20   /**
  21    * Post requestInfo message to Browser.
  22    */
  23   function requestInfo() {
  24     chrome.send('requestInfo');
  25   }
  26
  27   /**
  28    * Callback entry point from Browser.
  29    * Messages are Dispatched as Event to:
  30    *   * onAvailableSpaceUpdated,
  31    *   * onGlobalInfoUpdated,
  32    *   * onPerHostInfoUpdated,
  33    *   * onPerOriginInfoUpdated,
  34    *   * onStatisticsUpdated.
  35    * @param {string} message Message label. Possible Values are:
  36    *   * 'AvailableSpaceUpdated',
  37    *   * 'GlobalInfoUpdated',
  38    *   * 'PerHostInfoUpdated',
  39    *   * 'PerOriginInfoUpdated',
  40    *   * 'StatisticsUpdated'.
  41    * @param {Object} detail Message specific additional data.
  42    */
  43   function messageHandler(message, detail) {
  44     var target = null;
  45     switch (message) {
  46       case 'AvailableSpaceUpdated':
  47         target = cr.quota.onAvailableSpaceUpdated;
  48         break;
  49       case 'GlobalInfoUpdated':
  50         target = cr.quota.onGlobalInfoUpdated;
  51         break;
  52       case 'PerHostInfoUpdated':
  53         target = cr.quota.onPerHostInfoUpdated;
  54         break;
  55       case 'PerOriginInfoUpdated':
  56         target = cr.quota.onPerOriginInfoUpdated;
  57         break;
  58       case 'StatisticsUpdated':
  59         target = cr.quota.onStatisticsUpdated;
  60         break;
  61       default:
  62         console.error('Unknown Message');
  63         break;
  64     }
  65     if (target) {
  66       var event = cr.doc.createEvent('CustomEvent');
  67       event.initCustomEvent('update', false, false, detail);
  68       target.dispatchEvent(event);
  69     }
  70   }
  71
  72   return {
  73     onAvailableSpaceUpdated: new cr.EventTarget(),
  74     onGlobalInfoUpdated: new cr.EventTarget(),
  75     onPerHostInfoUpdated: new cr.EventTarget(),
  76     onPerOriginInfoUpdated: new cr.EventTarget(),
  77     onStatisticsUpdated: new cr.EventTarget(),
  78
  79     requestInfo: requestInfo,
  80     messageHandler: messageHandler
  81   };
  82 });