tv_xiaoyouxi/games/gldsys/lib/Proxy.js

/*
* Proxy
* Visit http://createjs.com/ for documentation, updates and examples.
*
* Copyright (c) 2010 gskinner.com, inc.
* 
* 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.
*/

/**
 * @module CreateJS
 */

// namespace:
this.createjs = this.createjs||{};

/**
 * Various utilities that the CreateJS Suite uses. Utilities are created as separate files, and will be available on the
 * createjs namespace directly:
 *
 * <h4>Example</h4>
 *      myObject.addEventListener("change", createjs.proxy(myMethod, scope));
 *
 * @class Utility Methods
 * @main Utility Methods
 */

(function() {
	"use strict";

	/**
	 * A function proxy for methods. By default, JavaScript methods do not maintain scope, so passing a method as a
	 * callback will result in the method getting called in the scope of the caller. Using a proxy ensures that the
	 * method gets called in the correct scope.
	 *
	 * Additional arguments can be passed that will be applied to the function when it is called.
	 *
	 * <h4>Example</h4>
	 *      myObject.addEventListener("event", createjs.proxy(myHandler, this, arg1, arg2));
	 *
	 *      function myHandler(arg1, arg2) {
	 *           // This gets called when myObject.myCallback is executed.
	 *      }
	 *
	 * @method proxy
	 * @param {Function} method The function to call
	 * @param {Object} scope The scope to call the method name on
	 * @param {mixed} [arg] * Arguments that are appended to the callback for additional params.
	 * @public
	 * @static
	 */
	createjs.proxy = function (method, scope) {
		var aArgs = Array.prototype.slice.call(arguments, 2);
		return function () {
			return method.apply(scope, Array.prototype.slice.call(arguments, 0).concat(aArgs));
		};
	}

}());