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。
-
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" ;??
-
??????????}??
-
????}??
-
}??
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:
-
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());??
-
????????????}??
txtShow.addEventListener(MouseEvent.CLICK,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:
?
-
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);??
-
}???
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