File:promote.js
- /*
- * promote
- * 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||{};
-
- /**
- * @class Utility Methods
- */
-
- /**
- * Promotes any methods on the super class that were overridden, by creating an alias in the format `prefix_methodName`.
- * It is recommended to use the super class's name as the prefix.
- * An alias to the super class's constructor is always added in the format `prefix_constructor`.
- * This allows the subclass to call super class methods without using `function.call`, providing better performance.
- *
- * For example, if `MySubClass` extends `MySuperClass`, and both define a `draw` method, then calling `promote(MySubClass, "MySuperClass")`
- * would add a `MySuperClass_constructor` method to MySubClass and promote the `draw` method on `MySuperClass` to the
- * prototype of `MySubClass` as `MySuperClass_draw`.
- *
- * This should be called after the class's prototype is fully defined.
- *
- * function ClassA(name) {
- * this.name = name;
- * }
- * ClassA.prototype.greet = function() {
- * return "Hello "+this.name;
- * }
- *
- * function ClassB(name, punctuation) {
- * this.ClassA_constructor(name);
- * this.punctuation = punctuation;
- * }
- * createjs.extend(ClassB, ClassA);
- * ClassB.prototype.greet = function() {
- * return this.ClassA_greet()+this.punctuation;
- * }
- * createjs.promote(ClassB, "ClassA");
- *
- * var foo = new ClassB("World", "!?!");
- * console.log(foo.greet()); // Hello World!?!
- *
- * @method promote
- * @param {Function} subclass The class to promote super class methods on.
- * @param {String} prefix The prefix to add to the promoted method names. Usually the name of the superclass.
- * @return {Function} Returns the subclass.
- */
- createjs.promote = function(subclass, prefix) {
- "use strict";
-
- var subP = subclass.prototype, supP = (Object.getPrototypeOf&&Object.getPrototypeOf(subP))||subP.__proto__;
- if (supP) {
- subP[(prefix+="_") + "constructor"] = supP.constructor; // constructor is not always innumerable
- for (var n in supP) {
- if (subP.hasOwnProperty(n) && (typeof supP[n] == "function")) { subP[prefix + n] = supP[n]; }
- }
- }
- return subclass;
- };
-
-