flash课件制作中应用到的鼠标双击效果制作方法

flash课件制作用法：
    建立一个空的MC并与该类链接，然后把这个MC放到主场景中，取个名字（本例为myDbClick），在主场景的第一帧加上以下代码：
var myDbClick:MovieClip;
var myObj = new Object();
myObj.onDbClick = function(evtObject:Object):Void{
 //trace(evtObject.target);
 //在此书写你的代码
}
myDbClick.addEventListener("onDbClick", myObj);

flash课件制作代　码：
import mx.events.EventDispatcher;
class DbClick extends MovieClip {
 private var firstClickTime:Number;
 private var lastClickTime:Number;
 private var n:Number = 0;
 private var dispatchEvent:Function;
 private static var _mixin1 = EventDispatcher.initialize(DbClick.prototype);
 function DbClick() {
 } 
 private function onLoad():Void {
  var onwer:Object = this;
  _root.onMouseDown = function(){
   onwer.ifDbClick();
  }
 }
 private function ifDbClick():Void {
  if ( n == 0 ){
   n = 1;
   firstClickTime = getTimer();
  }else{
   n = 0;
   lastClickTime = getTimer();
  }
  //两次点击时间差在300毫秒以内计为双击
  if ( Math.abs(lastClickTime - firstClickTime) < 300 ) {
   //trace("double click");
   //发出事件
   this.dispatchEvent({ type:"onDbClick", target:this });
  }
 }
}