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      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 });
     83