AddedToStage

/*
* AddedToStage
* 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.
*/

this.createjs = this.createjs || {};

(function () {
	"use strict";

	var o = {};
	
	o.mixin = function(target) {
		target.on("added", o._added, target);
		target.on("removed", o._removed, target);
		return target;
	};
	
	o._added = function(evt) {
		var stage;
		if (this.__AddedToStage_stage || !(stage = this.getStage())) { return; }
		o._dispatch(this, "addedToStage", stage);
	};
	
	o._removed = function(evt) {
		if (this.__AddedToStage_stage) { o._dispatch(this, "removedFromStage", null); }
	};
	
	o._dispatch = function(target, type, stage) {
		target.__AddedToStage_stage = stage;
		target.dispatchEvent(type);
		var kids = target.children;
		if (!kids) { return; }
		for (var i= 0, l=kids.length; i<l; i++) {
			this._dispatch(kids[i], type, stage);
		}
	};

// private methods:

	createjs.AddedToStage = o;
})();