AS 3.0缓动拖动

package { import flash.display.DisplayObject; import flash.display.DisplayObjectContainer; import flash.display.MovieClip; import flash.events.MouseEvent; import flash.events.Event; public class LtouchScroll{ public var tween:Number = 0.3; //缓动 0-1之间 1为不缓动 public var moveSetp:Number = 200; //左右按钮移动幅度 private var v_targetMC:MovieClip; private var v_maskMC:MovieClip; private var v_Lbnt:MovieClip; private var v_Rbnt:MovieClip; private var automask:Boolean = false;//是否自动遮罩 private var LimitLeft:Number; private var LimitRight:Number; private var toPositionX:Number; private var StartPositionX:Number; private var distance:Number; private var StopPos:Number;