Starling中MovieClip倒序，反向播发

package com.liyunpeng.xxx{	import flash.media.Sound;		import starling.animation.IAnimatable;	import starling.display.MovieClip;	import starling.textures.Texture;		public class MMovieClip extends MovieClip implements IAnimatable	{		private var _isReverse:Boolean = false;				public function MMovieClip(textures:Vector.<Texture>, fps:Number=12)		{			super(textures,fps);		}				public function set isReverse(value:Boolean):void		{			if(this._isReverse != value) {				var numFrames:int = this.numFrames;								var mTextures:Vector.<Texture> = new Vector.<Texture>();				var mSounds:Vector.<Sound> = new Vector.<Sound>();				var mDurations:Vector.<Number> = new Vector.<Number>();								for(var i:int=numFrames-1;i>=0;i--) {					mTextures.push(this.getFrameTexture(i));					mSounds.push(this.getFrameSound(i));					mDurations.push(this.getFrameDuration(i));				}								for(var j:int=0;j<numFrames;j++) {					this.setFrameTexture(j,mTextures[j]);				}								this.currentFrame = numFrames-1 - this.currentFrame;			}						this._isReverse = value;		}				public function get isReverse():Boolean		{			return this._isReverse;		}	}}