text: /****************************************************************************
   Copyright (c) 2008-2010 Ricardo Quesada
   Copyright (c) 2011-2012 cocos2d-x.org
   Copyright (c) 2013-2014 Chukong Technologies Inc.
  
   http://www.cocos2d-x.org
  
   Permission is hereby granted, free of charge, to any person obtaining a copy
   of this software and associated documentation files (the "Software"), to deal
   in the Software without restriction, including without limitation the rights
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   copies of the Software, and to permit persons to whom the Software is
   furnished to do so, subject to the following conditions:
  
   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.
  
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   THE SOFTWARE.
   ****************************************************************************/
  
  /**
   * @namespace The fullscreen API provides an easy way for web content to be presented using the user's entire screen.
   * It's invalid on safari,QQbrowser and android browser
   * @name cc.screen
   */
  cc.screen = /** @lends cc.screen# */{
      _supportsFullScreen: false,
  	// the pre fullscreenchange function
      _preOnFullScreenChange: null,
      _touchEvent: "",
  	_fn: null,
  	// Function mapping for cross browser support
  	_fnMap: [
  		[
  			'requestFullscreen',
  			'exitFullscreen',
  			'fullscreenchange',
  			'fullscreenEnabled',
  			'fullscreenElement'
  		],
  		[
  			'requestFullScreen',
  			'exitFullScreen',
  			'fullScreenchange',
  			'fullScreenEnabled',
  			'fullScreenElement'
  		],
  		[
  			'webkitRequestFullScreen',
  			'webkitCancelFullScreen',
  			'webkitfullscreenchange',
  			'webkitIsFullScreen',
  			'webkitCurrentFullScreenElement'
  		],
  		[
  			'mozRequestFullScreen',
  			'mozCancelFullScreen',
  			'mozfullscreenchange',
  			'mozFullScreen',
  			'mozFullScreenElement'
  		],
  		[
  			'msRequestFullscreen',
  			'msExitFullscreen',
  			'MSFullscreenChange',
  			'msFullscreenEnabled',
  			'msFullscreenElement'
  		]
  	],
  
      init: function () {
  	    this._fn = {};
  	    var i, val, map = this._fnMap, valL;
  	    for (i = 0, l = map.length; i < l; i++ ) {
  		    val = map[ i ];
  		    if ( val && val[1] in document ) {
  			    for ( i = 0, valL = val.length; i < valL; i++ ) {
  				    this._fn[ map[0][ i ] ] = val[ i ];
  			    }
  			    break;
  		    }
  	    }
  
  		this._supportsFullScreen = (this._fn.requestFullscreen != undefined);
          this._touchEvent = ('ontouchstart' in window) ? 'touchstart' : 'mousedown';
      },
  
      /**
       * return true if it's full now.
       * @returns {Boolean}
       */
      fullScreen: function() {
  	    return this._supportsFullScreen && document[ this._fn.fullscreenEnabled ];
      },
  
      /**
       * change the screen to full mode.
       * @param {Element} element
       * @param {Function} onFullScreenChange
       */
      requestFullScreen: function (element, onFullScreenChange) {
  	    if (!this._supportsFullScreen) return;
  
  	    element = element || document.documentElement;
  	    element[ this._fn.requestFullscreen ]();
  
  	    if (onFullScreenChange) {
  		    var eventName = this._fn.fullscreenchange;
  		    if (this._preOnFullScreenChange)
  			    document.removeEventListener(eventName, this._preOnFullScreenChange);
  		    this._preOnFullScreenChange = onFullScreenChange;
              cc._addEventListener(document, eventName, onFullScreenChange, false);
  	    }
  
          return element[ this._fn.requestFullscreen ]();
      },
  
      /**
       * exit the full mode.
       */
      exitFullScreen: function () {
          return this._supportsFullScreen ? document[ this._fn.exitFullscreen ]() : true;
      },
  
      /**
       * Automatically request full screen with a touch/click event
       * @param {Element} element
       * @param {Function} onFullScreenChange
       */
      autoFullScreen: function (element, onFullScreenChange) {
  	    element = element || document.body;
  	    var touchTarget = cc._canvas || element;
          var theScreen = this;
          // Function bind will be too complicated here because we need the callback function's reference to remove the listener
          function callback() {
              theScreen.requestFullScreen(element, onFullScreenChange);
              touchTarget.removeEventListener(theScreen._touchEvent, callback);
          }
          this.requestFullScreen(element, onFullScreenChange);
          cc._addEventListener(touchTarget, this._touchEvent, callback);
      }
  };
  cc.screen.init();