Flash as3检查事件侦听器 [英] flash as3 check event listener

问题描述

他们是否可以检查是否已存在事件侦听器以将其删除?

  stage.addEventListener(MouseEvent.CLICK，clickdownfunction); 

基本上，我想删除侦听器，但是有时它已经被删除了，所以我想检查它是否存在以及是否存在，然后将其删除.

这可能吗?

解决方案

从

签出 hasEventListener()函数

https://help.adobe.com/zh_CN/FlashPlatform/reference/actionscript/3/flash/events/IEventDispatcher.html#hasEventListener()

我不确定您为什么要进行此检查.删除不存在的侦听器不会使Flash掉落异常或错误，因此检查只是增加了不必要的开销.

Is their a way to check if an event listener already exists to remove it?

stage.addEventListener(MouseEvent.CLICK, clickdownfunction);

Basically, I want to remove the listener, but sometimes it has already been removed, so I want to check if it exists and if it does, then remove it.

Is this possible?

解决方案

Check out the hasEventListener() function from

https://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/events/IEventDispatcher.html#hasEventListener()

I am not really sure though why you want to do that check. Removing non existant listeners won't make Flash drop exceptions or errors, thus the check is just adding unneccessary overhead.

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