Question

求大神给我解释下这一段Flash代码，希望可以尽量详细

MouseMove.as

package {
import flash.display.MovieClip;
import flash.events.Event;
import flash.events.EventDispatcher;
public class MouseMove extends MovieClip {
private var _mc:MovieClip;
private var Y:Number;
private var _distance:Number;
private var directions:Number=-1;
public function MouseMove(target:MovieClip,distance):void {
_mc=target;
Y=_mc.y;
_distance=Y-distance;
}
public function startMove():void {
_mc.addEventListener(Event.ENTER_FRAME,moves);
}
private function moves(e:Event):void {
var mc:MovieClip=e.target as MovieClip;
var dis:Number=Math.abs(mc.y-_distance)+0.2;
mc.y+=dis/4*directions;
if (mc.y<=_distance) {
directions=1;
} else if (directions==1&&mc.y>=Y) {
mc.y=Y;
directions=-1;
mc.removeEventListener(Event.ENTER_FRAME,moves);
mc.dispatchEvent(new Event("moveover"));}}}}

Answer 1

MouseMove.aspackage{进口flash.display.MovieClip;进口flash.events.Event;进口flash.events.EventDispatcher;公共类的MouseMove扩展的MovieClip{私人VAR_mc：影片剪辑;私人变种Y：数量;私人VAR_distance：数量;私人VAR方向：数=-1;公共职能的MouseMove（目标：影片剪辑，距离）：无效{_mc=目标;Y =_mc.y;_distance= Y-距离;}公共职能startMove（）：无效{_mc.addEventListener（Event.ENTER_FRAME，移动）;}私有函数的动作（E：事件）：无效{VARMC：影片剪辑=e.target为影片剪辑;VARDIS：数=Math.abs（mc.y-_distance）0.2;mc.y= +DIS /4*方向;如果（mc.y<= _距离）{方向= 1;}否则，如果（方向==1&&mc.y>=Y）{mc.y= Y;方向= -1;mc.removeEventListener（Event.ENTER_FRAME，移动）;mc.dispatchEvent（新事件（“moveover”））;}}}}