ActionScript 3.0使用事件处理程序的闭包 [英] ActionScript 3.0 using closures for event handlers

问题描述

我试过这样做：

root.addEventListener("click", 
   function () 
   { 
      navigateToURL(ClickURLRequest,"_self"); 
   });

它添加了事件监听器。我喜欢使用闭包，因为它们在这种情况下工作良好，

And it does add the event listener. I like using closures because they work well in this situation,

但是，删除事件侦听器需要一个对原始函数的引用，并且因为我使用匿名闭包不工作，我试过：

however, removing the event listener requires a reference to the original function, and since I used an anonymous closure, it does not work, I tried:

   root.removeEventListener("click", 
       function () 
       { 
          navigateToURL(ClickURLRequest,"_self"); 
       });

以及：

   root.removeEventListener("click", function () {} );

我发现它的唯一方法是去掉匿名闭包，指向事件监听器预先存在的函数：

The only way I found it would work was to ditch the anonymous closure and point the event listeners at a pre-existing function:

 function OnClick (e:Event)
 {
     navigateToURL(ClickURLRequest,"_self");
 }

 root.addEventListener("click", OnClick);
 root.removeEventListener("click", OnClick);

有没有人知道一种方法来使用匿名闭包为事件处理程序，同时仍保留删除它们的能力？

Does anyone know a way to use anonymous closures for event handlers while still retaining the ability to remove them?

推荐答案

这里是一个通用的方法去除在生产项目中使用的事件监听器

Here's a generic way of removing event listeners that i have used on production projects

addEventListener
(
    Event.ACTIVATE, 
    function(event:Event):void
    {
        (event.target as EventDispatcher).removeEventListener(event.type, arguments.callee)             
    }
)

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