remoting/webapp/crd/js/fullscreen_v1.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  * @fileoverview
   7  * Full-screen implementation for apps v1, using webkitRequestFullscreen.
   8  */
   9
  10 'use strict';
  11
  12 /** @suppress {duplicate} */
  13 var remoting = remoting || {};
  14
  15 /**
  16  * @constructor
  17  * @implements {remoting.Fullscreen}
  18  */
  19 remoting.FullscreenAppsV1 = function() {
  20   /** @private {string} Internal 'full-screen changed' event name */
  21   this.kEventName_ = '_fullscreenchanged';
  22
  23   /** @private {base.EventSourceImpl} */
  24   this.eventSource_ = new base.EventSourceImpl();
  25   this.eventSource_.defineEvents([this.kEventName_]);
  26
  27   document.addEventListener(
  28       'webkitfullscreenchange',
  29       this.onFullscreenChanged_.bind(this),
  30       false);
  31 };
  32
  33 remoting.FullscreenAppsV1.prototype.activate = function(
  34     fullscreen, opt_onDone) {
  35   if (opt_onDone) {
  36     if (this.isActive() == fullscreen) {
  37       opt_onDone();
  38     } else {
  39       /** @type {remoting.Fullscreen} */
  40       var that = this;
  41       var callbackAndRemoveListener = function() {
  42         that.removeListener(callbackAndRemoveListener);
  43         opt_onDone();
  44       };
  45       this.addListener(callbackAndRemoveListener);
  46     }
  47   }
  48
  49   if (fullscreen) {
  50     document.body.webkitRequestFullScreen(Element.ALLOW_KEYBOARD_INPUT);
  51   } else {
  52     document.webkitCancelFullScreen();
  53   }
  54 };
  55
  56 /** @return {void} */
  57 remoting.FullscreenAppsV1.prototype.toggle = function() {
  58   this.activate(!this.isActive());
  59 };
  60
  61 /**
  62  * @return {boolean} True if full-screen mode is active.
  63  */
  64 remoting.FullscreenAppsV1.prototype.isActive = function() {
  65   return document.webkitIsFullScreen;
  66 };
  67
  68 /**
  69  * @param {function(boolean=):void} callback
  70  */
  71 remoting.FullscreenAppsV1.prototype.addListener = function(callback) {
  72   this.eventSource_.addEventListener(this.kEventName_, callback);
  73 };
  74
  75 /**
  76  * @param {function(boolean=):void} callback
  77  */
  78 remoting.FullscreenAppsV1.prototype.removeListener = function(callback) {
  79   this.eventSource_.removeEventListener(this.kEventName_, callback);
  80 };
  81
  82 /**
  83  * @private
  84  */
  85 remoting.FullscreenAppsV1.prototype.onFullscreenChanged_ = function() {
  86   /** @this {remoting.FullscreenAppsV1} */
  87   var checkIsActive = function() {
  88     if (this.isActive()) {
  89       document.body.classList.add('fullscreen');
  90     } else {
  91       document.body.classList.remove('fullscreen');
  92     }
  93     this.eventSource_.raiseEvent(this.kEventName_, this.isActive());
  94   };
  95
  96   // Querying full-screen immediately after the webkitfullscreenchange
  97   // event fires sometimes gives the wrong answer on Mac, perhaps due to
  98   // the time taken to animate presentation mode. Since I haven't been able
  99   // to isolate the exact repro steps, and we're not planning on using this
 100   // API for much longer, this hack will suffice for now.
 101   window.setTimeout(checkIsActive.bind(this), 500);
 102 };