CCScreen.js

/****************************************************************************
 Copyright (c) 2010-2012 cocos2d-x.org
 Copyright (c) 2008-2010 Ricardo Quesada
 Copyright (c) 2011      Zynga Inc.

 http://www.cocos2d-x.org

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 all copies or substantial portions of the Software.

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/**
 * 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
 * @class
 * @extends cc.Class
 */
cc.Screen = cc.Class.extend({
    _supportsFullScreen: false,
	// the pre fullscreenchange function
    _preOnFullScreenChange: null,
    _touchEvent: "",
	_fn: null,
	// Function mapping for cross browser support
	_fnMap: [
		[
			'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
     * @returns {*}
     */
    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;
		    document.addEventListener(eventName, onFullScreenChange, false);
	    }

        return element[ this._fn.requestFullscreen ]();
    },

    /**
     * exit the full mode.
     * @returns {*}
     */
    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);
        touchTarget.addEventListener(this._touchEvent, callback);
    }
});

/**
 * returns a shared instance of the cc.Screen
 * @function
 * @return {cc.Screen}
 */
cc.Screen.getInstance = function () {
    if (!this._instance){
        var screen = new cc.Screen();
        screen.init();
        this._instance = screen;
    }
    return this._instance;
};