src/third_party/WebKit/Source/devtools/front_end/ui/ZoomManager.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 /**
   6  * @constructor
   7  * @extends {WebInspector.Object}
   8  * @param {!Window} window
   9  * @param {!InspectorFrontendHostAPI} frontendHost
  10  */
  11 WebInspector.ZoomManager = function(window, frontendHost)
  12 {
  13     this._frontendHost = frontendHost;
  14     this._zoomFactor = this._frontendHost.zoomFactor();
  15     window.addEventListener("resize", this._onWindowResize.bind(this), true);
  16 };
  17
  18 WebInspector.ZoomManager.Events = {
  19     ZoomChanged: "ZoomChanged"
  20 };
  21
  22 WebInspector.ZoomManager.prototype = {
  23     /**
  24      * @return {number}
  25      */
  26     zoomFactor: function()
  27     {
  28         return this._zoomFactor;
  29     },
  30
  31     _onWindowResize: function()
  32     {
  33         var oldZoomFactor = this._zoomFactor;
  34         this._zoomFactor = this._frontendHost.zoomFactor();
  35         if (oldZoomFactor !== this._zoomFactor)
  36             this.dispatchEventToListeners(WebInspector.ZoomManager.Events.ZoomChanged, {from: oldZoomFactor, to: this._zoomFactor});
  37     },
  38
  39     __proto__: WebInspector.Object.prototype
  40 };
  41
  42 /**
  43  * @type {!WebInspector.ZoomManager}
  44  */
  45 WebInspector.zoomManager;