flex 百叶窗效果

Blinds.as
package effects
{

import effects.effectClasses.BlindsInstance;

import mx.controls.scrollClasses.ScrollBarDirection;
import mx.effects.IEffectInstance;
import mx.effects.TweenEffect;

public class Blinds extends TweenEffect
{

private static var AFFECTED_PROPERTIES:Array = ["mask"];

public function Blinds(target:Object=null)
{
super(target);
instanceClass = BlindsInstance;
}

public var direction:String = ScrollBarDirection.VERTICAL;

public var blindsfrom:Number;

public var blindsTo:Number;

public var gapfrom:Number;

public var gapTo:Number;

override public function getAffectedProperties():Array
{
return AFFECTED_PROPERTIES;
}

override protected function initInstance(instance:IEffectInstance):void
{
super.initInstance(instance);
var blindsInstance:BlindsInstance = BlindsInstance(instance);
blindsInstance.direction = direction;
blindsInstance.blindsfrom = blindsfrom;
blindsInstance.blindsTo = blindsTo;
blindsInstance.gapfrom = gapfrom;
blindsInstance.gapTo = gapTo;
}

}

}
 
BlindsInstance.as
package effects.effectClasses
{

import flash.display.DisplayObject;
import flash.display.Sprite;

import mx.controls.scrollClasses.ScrollBarDirection;
import mx.effects.effectClasses.TweenEffectInstance;

public class BlindsInstance extends TweenEffectInstance
{

public function BlindsInstance(target:Object)
{
super(target);
}

public var direction:String = ScrollBarDirection.VERTICAL;

public var blindsfrom:Number;