Flex addEventListener增加事件侦听函数时传递多个参数

浅浅的花香味﹌ 2022-09-29 11:59 10阅读 0赞

今天在flex里通过addEventListener函数给控件动态加载click事件侦听函数时，除了事件本身传递的Event类型参数外，还需要传递更多的参数，在网上找了一段代码，用起来还不错，张贴到这里。

Java代码

1.  package   
2.  \{  
3.      public   class  EventArgExtend  
4.      \{  
5.          public  function EventArgExtend()  
6.          \{  
7.          \}  
8.            
9.          public   static  function create(f:Function,... arg):Function   
10.         \{  
11.                var F:Boolean=false ;  
12.                var \_f:Function=function(e:\*,...\_arg)  
13.                \{  
14.                    \_arg=arg  
15.                    if (!F)  
16.                    \{  
17.                        F=true   
18.                        \_arg.unshift(e)  
19.                    \}  
20.                    f.apply(null ,\_arg)  
21.                \};  
22.                return  \_f;  
23.           \}  
24.           public   static  function toString():String   
25.           \{  
26.                return   "Class JEventDelegate" ;  
27.           \}  
28.     \}  
29. \}

package
    {
        public class EventArgExtend
        {
            public function EventArgExtend()
            {
            }
            
            public static function create(f:Function,... arg):Function 
            {
                   var F:Boolean=false;
                   var _f:Function=function(e:*,..._arg)
                   {
                       _arg=arg
                       if(!F)
                       {
                           F=true
                           _arg.unshift(e)
                       }
                       f.apply(null,_arg)
                   };
                   return _f;
              }
              public static function toString():String 
              {
                   return "Class JEventDelegate";
              }
        }
    }

使用的方式：

Java代码

1.  txtShow.addEventListener(MouseEvent.CLICK,EventArgExtend.create(clickHandler, 1 , "str" ));  
2.    
3.              private  function clickHandler(e:Event,...arg): void   
4.              \{  
5.                  Alert.show(arg\[0 \].toString());  
6.                  Alert.show(arg\[1 \].toString());  
7.              \}

txtShow.addEventListener(MouseEvent.CLICK,EventArgExtend.create(clickHandler,1,"str"));
    
                private function clickHandler(e:Event,...arg):void
                {
                    Alert.show(arg[0].toString());
                    Alert.show(arg[1].toString());
                }

还有另外一个方法，没有封装效果，不过代码更加容易理解：

Java代码

1.  var sayHello:String =  "欢迎光临www.FlashJ.cn -Flash,Ria技术博客" ;  
2.  btn1.addEventListener(MouseEvent.CLICK,function (e:MouseEvent)\{clickHandlerWithArg(e,sayHello)\});  
3.  function clickHandlerWithArg(e:MouseEvent,arg:String):void   
4.  \{  
5.      var out:String= e.target + "发出事件(有参数) :"  + arg;  
6.      trace(out);  
7.  \}

var sayHello:String = "欢迎光临www.FlashJ.cn -Flash,Ria技术博客";
    btn1.addEventListener(MouseEvent.CLICK,function (e:MouseEvent){clickHandlerWithArg(e,sayHello)});
    function clickHandlerWithArg(e:MouseEvent,arg:String):void
    {
    	var out:String= e.target + "发出事件(有参数) :" + arg;
    	trace(out);
    }

转自：http://pengranxiang.javaeye.com/blog/640536