有关自定义分派事件类的解说

自定义分派事件类：(文档类Test.as  事件类Events.as  按钮类Buttons.as)
文档类Test.as
package {
       import fl.controls.*;
       import fl.managers.*;
       import flash.display.*;
       import flash.text.*;
       import flash.events.*;
       import fl.transitions.*;
       import fl.transitions.easing.*;
      
       import Events;
      
       public class Test extends MovieClip {
             
              private var _dispatcher=Events.dispatcher;
             
              public function Test() {
                     var buttons:Buttons=new Buttons();
                     addChild(buttons);
                                         
                     _dispatcher.addEventListener(Events.ONE,patch1);
                     _dispatcher.addEventListener(Events.TWO,patch2);
                    
              }
             
              private function patch1(evt:Events){
                     trace("绑定1实现了");
              }
             
              private function patch2(evt:Events){
                     trace("绑定2实现了");
              }
             
       }
}

事件类Events.as
package{
       import flash.events.Event;
       import flash.events.EventDispatcher;
      
       public class Events extends Event{
              public static var dispatcher:EventDispatcher=new EventDispatcher();
              public static const ONE:String="one";
              public static const TWO:String="two";
             
              public function Events(str:String){
                     super(str);
              }
             
       }
}

按钮类Buttons.as
package {
       import fl.controls.*;
       import fl.managers.*;
       import flash.display.*;
       import flash.text.*;
       import flash.events.*;
       import fl.transitions.*;
       import fl.transitions.easing.*;
      
       import Events;
      
       public class Buttons extends MovieClip {
             
              private var _dispatcher=Events.dispatcher;
             
              public function Buttons() {
                     var button1:Button=new Button();
                     button1.label="绑定1";
                     button1.addEventListener(MouseEvent.CLICK,send1);
                     addChild(button1);
                    
                     var button2:Button=new Button();
                     button2.label="绑定2";
                     button2.x=200;
                     button2.addEventListener(MouseEvent.CLICK,send2);
                     addChild(button2 );
                                         
              }
             
              private function send1(evt:MouseEvent){
                     _dispatcher.dispatchEvent(new Events(Events.ONE));
              }
             
              private function send2(evt:MouseEvent){
                     _dispatcher.dispatchEvent(new Events(Events.TWO));
              }

       }
}