src/chrome/renderer/resources/extensions/extension_options_events.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 var EventBindings = require('event_bindings');
   6
   7 var CreateEvent = function(name) {
   8   var eventOpts = {supportsListeners: true, supportsFilters: true};
   9   return new EventBindings.Event(name, undefined, eventOpts);
  10 };
  11
  12 var EXTENSION_OPTIONS_EVENTS = {
  13   'close': {
  14     evt: CreateEvent('extensionOptionsInternal.onClose'),
  15     fields: []
  16   },
  17   'load': {
  18     evt: CreateEvent('extensionOptionsInternal.onLoad'),
  19     fields: []
  20   },
  21   'sizechanged': {
  22     evt: CreateEvent('extensionOptionsInternal.onSizeChanged'),
  23     customHandler: function(handler, event, extensionOptionsEvent) {
  24       handler.handleSizeChangedEvent(event, extensionOptionsEvent);
  25     },
  26     fields:['newWidth', 'newHeight', 'oldWidth', 'oldHeight']
  27   }
  28 }
  29
  30 /**
  31  * @constructor
  32  */
  33 function ExtensionOptionsEvents(extensionOptionsInternal, viewInstanceId) {
  34   this.extensionOptionsInternal = extensionOptionsInternal;
  35   this.viewInstanceId = viewInstanceId;
  36   this.setup();
  37 }
  38
  39 // Sets up events.
  40 ExtensionOptionsEvents.prototype.setup = function() {
  41   for (var eventName in EXTENSION_OPTIONS_EVENTS) {
  42     this.setupEvent(eventName, EXTENSION_OPTIONS_EVENTS[eventName]);
  43   }
  44 };
  45
  46 ExtensionOptionsEvents.prototype.setupEvent = function(name, info) {
  47   var self = this;
  48   info.evt.addListener(function(e) {
  49     var details = {bubbles:true};
  50     if (info.cancelable)
  51       details.cancelable = true;
  52     var extensionOptionsEvent = new Event(name, details);
  53     $Array.forEach(info.fields, function(field) {
  54       if (e.hasOwnProperty(field)) {
  55         extensionOptionsEvent[field] = e[field];
  56       }
  57     });
  58     if (info.customHandler) {
  59       info.customHandler(self, e, extensionOptionsEvent);
  60       return;
  61     }
  62     self.extensionOptionsInternal.dispatchEvent(extensionOptionsEvent);
  63   }, {instanceId: self.viewInstanceId});
  64
  65   this.extensionOptionsInternal.setupEventProperty(name);
  66 };
  67
  68 ExtensionOptionsEvents.prototype.handleSizeChangedEvent = function(
  69     event, extensionOptionsEvent) {
  70   this.extensionOptionsInternal.onSizeChanged(extensionOptionsEvent.newWidth,
  71                                               extensionOptionsEvent.newHeight,
  72                                               extensionOptionsEvent.oldWidth,
  73                                               extensionOptionsEvent.oldHeight);
  74   this.extensionOptionsInternal.dispatchEvent(extensionOptionsEvent);
  75 }
  76
  77 exports.ExtensionOptionsEvents = ExtensionOptionsEvents;
  78 exports.CreateEvent = CreateEvent;