AutoAlphaPlugin.as
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/**
* VERSION: 2.3
* DATE: 10/17/2009
* ACTIONSCRIPT VERSION: 3.0
* UPDATES AND DOCUMENTATION AT: http://www.TweenMax.com
**/
package com.greensock.plugins {
import com.greensock.*;
import flash.display.*;
/**
* Tweening "autoAlpha" is exactly the same as tweening an object's "alpha" except that it ensures
* that the object's "visible" property is true until autoAlpha reaches zero at which point it will
* toggle the "visible" property to false. That not only improves rendering performance in the Flash Player,
* but also hides DisplayObjects so that they don't interact with the mouse. <br /><br />
*
* <b>USAGE:</b><br /><br />
* <code>
* import com.greensock.TweenLite; <br />
* import com.greensock.plugins.TweenPlugin; <br />
* import com.greensock.plugins.AutoAlphaPlugin; <br />
* TweenPlugin.activate([AutoAlphaPlugin]); //activation is permanent in the SWF, so this line only needs to be run once.<br /><br />
*
* TweenLite.to(mc, 2, {autoAlpha:0}); <br /><br />
* </code>
*
* <b>Copyright 2010, GreenSock. All rights reserved.</b> This work is subject to the terms in <a href="http://www.greensock.com/terms_of_use.html">http://www.greensock.com/terms_of_use.html</a> or for corporate Club GreenSock members, the software agreement that was issued with the corporate membership.
*
* @author Jack Doyle, jack@greensock.com
*/
public class AutoAlphaPlugin extends TweenPlugin {
/** @private **/
public static const API:Number = 1.0; //If the API/Framework for plugins changes in the future, this number helps determine compatibility
/** @private **/
protected var _target:Object;
/** @private **/
protected var _ignoreVisible:Boolean;
/** @private **/
public function AutoAlphaPlugin() {
super();
this.propName = "autoAlpha";
this.overwriteProps = ["alpha","visible"];
}
/** @private **/
override public function onInitTween(target:Object, value:*, tween:TweenLite):Boolean {
_target = target;
addTween(target, "alpha", target.alpha, value, "alpha");
return true;
}
/** @private **/
override public function killProps(lookup:Object):void {
super.killProps(lookup);
_ignoreVisible = Boolean("visible" in lookup);
}
/** @private **/
override public function set changeFactor(n:Number):void {
updateTweens(n);
if (!_ignoreVisible) {
_target.visible = Boolean(_target.alpha != 0);
}
}
}
}