1 /****************************************************************************
  2  Copyright (c) 2010-2012 cocos2d-x.org
  3  Copyright (c) 2008-2010 Ricardo Quesada
  4  Copyright (c) 2011      Zynga Inc.
  5 
  6  http://www.cocos2d-x.org
  7 
  8  Permission is hereby granted, free of charge, to any person obtaining a copy
  9  of this software and associated documentation files (the "Software"), to deal
 10  in the Software without restriction, including without limitation the rights
 11  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 12  copies of the Software, and to permit persons to whom the Software is
 13  furnished to do so, subject to the following conditions:
 14 
 15  The above copyright notice and this permission notice shall be included in
 16  all copies or substantial portions of the Software.
 17 
 18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 19  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 20  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 21  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 22  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 23  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 24  THE SOFTWARE.
 25  ****************************************************************************/
 26 
 27 /**
 28  * The fullscreen API provides an easy way for web content to be presented using the user's entire screen.
 29  * It's invalid on safari,QQbrowser and android browser
 30  * @class
 31  * @extends cc.Class
 32  */
 33 cc.Screen = cc.Class.extend({
 34     _supportsFullScreen: false,
 35     _browserPrefix: "",
 36     _preElement: null,//the pre element to show in full screen mode.
 37     _preOnFullScreenChange: null,//the pre fullscreenchange function
 38     _touchEvent: "",
 39     init: function () {
 40         var browserPres = 'webkit,moz,o,ms,khtml'.split(',');
 41         var body = document.body;
 42         if (body["requestFullScreen"]) {
 43             this._supportsFullScreen = true;
 44         } else {
 45             for (var i = 0, il = browserPres.length, prefix; i < il; i++) {
 46                 prefix = browserPres[i];
 47                 if (body[prefix + "RequestFullScreen"]) {
 48                     this._supportsFullScreen = true;
 49                     this._browserPrefix = prefix;
 50                     break;
 51                 }
 52             }
 53         }
 54 
 55         this._touchEvent = ('ontouchstart' in window) ? 'touchstart' : 'mousedown';
 56     },
 57 
 58     /**
 59      * return true if it's full now.
 60      * @returns {Boolean}
 61      */
 62     fullScreen: function () {
 63         var d = document;
 64         if (this._supportsFullScreen) {
 65             switch (this._browserPrefix) {
 66                 case '':
 67                     return d["fullScreen"];
 68                 case 'webkit':
 69                     return d["webkitIsFullScreen"];
 70                 default:
 71                     return d[this._browserPrefix + 'FullScreen'];
 72             }
 73         }
 74         return false;
 75     },
 76 
 77     /**
 78      * change the screen to full mode.
 79      * @param {Element} element
 80      * @param {Function} onFullScreenChange
 81      * @returns {*}
 82      */
 83     requestFullScreen: function (element, onFullScreenChange) {
 84         if (!this._supportsFullScreen || this.fullScreen()) return;
 85         if (onFullScreenChange) {
 86             var eventName = this._browserPrefix + "fullscreenchange";
 87             if (this._preElement && this._preOnFullScreenChange) this._preElement.removeEventListener(eventName, this._preOnFullScreenChange);
 88             this._preElement = element;
 89             this._preOnFullScreenChange = onFullScreenChange;
 90             element.addEventListener(eventName, onFullScreenChange, false);
 91         }
 92         return (this._browserPrefix === '') ? element["requestFullScreen"]() : element[this._browserPrefix + 'RequestFullScreen']();
 93     },
 94 
 95     /**
 96      * exit the full mode.
 97      * @returns {*}
 98      */
 99     exitFullScreen: function () {
100         if (!this._supportsFullScreen || !this.fullScreen()) return;
101         return (this._browserPrefix === '') ? document.body["cancelFullScreen"]() : document.body[this._browserPrefix + 'CancelFullScreen']();
102     },
103 
104     /**
105      * Automatically request full screen with a touch/click event
106      */
107     autoFullScreen: function (element, onFullScreenChange) {
108         var theScreen = this;
109         // Function bind will be too complicated here because we need the callback function's reference to remove the listener
110         function callback() {
111             theScreen.requestFullScreen(element, onFullScreenChange);
112             element.removeEventListener(theScreen._touchEvent, callback);
113         }
114         this.requestFullScreen(element, onFullScreenChange);
115         element.addEventListener(this._touchEvent, callback);
116     }
117 });
118 
119 /**
120  * returns a shared instance of the cc.Screen
121  * @function
122  * @return {cc.Screen}
123  */
124 cc.Screen.getInstance = function () {
125     if (!this._instance){
126         var screen = new cc.Screen();
127         screen.init();
128         this._instance = screen;
129     }
130     return this._instance;
131 };
132