听下来子组件的显示列表事件 [英] listening to events down the display list in children components

问题描述

我创建一个SWF，有一个父类和子类。父类有一个按钮，即调度自定义事件，我想在子类列出了此事件，但是当我分派事件的子类没有听到该事件已经出动。

I'm creating a swf, that has a parent class and a child class. The parent class has a button, that dispatches a custom event and I want the child class to list for this event, but when I dispatch the event the child class does not hear the event has been dispatched.

这是在code分派事件：

This is the code that dispatches the event:

私有函数onCTAClicked（E：MouseEvent）方法：无效         {             跟踪（onCTAClicked）;             则dispatchEvent（新CTAClickEvent（CTAClickEvent.CTA_CLICK_EVENT，真））;         }

private function onCTAClicked(e:MouseEvent):void { trace("onCTAClicked"); dispatchEvent(new CTAClickEvent(CTAClickEvent.CTA_CLICK_EVENT,true)); }

和注册该侦听器是这样的：

And the listener is registered like this:

公共职能registerEventListeners（）：无效         {             this.addEventListener（CTAClickEvent.CTA_CLICK_EVENT，onCTAClickHandler，假）;
        }

public function registerEventListeners():void { this.addEventListener(CTAClickEvent.CTA_CLICK_EVENT, onCTAClickHandler,false);
}

在registerEventListeners（）函数在子类。

The registerEventListeners() function is in the child class.

我知道事件可以泡出显示列表，但再怎么能下井名单？

I know events can bubble up the display list but how can then go down the list?

斯蒂芬

推荐答案

没有，事件不会往下挖。他们只泡了起来。为了显示对象的子听取家长调度的事件，在类的子对象的你需要一个侦听器添加到父对象的引用。

No, events do not dig down. They only bubble up. In order for a child of a display object to hear an event dispatched by a parent, in the class of the child object you'll need to add a listener to a reference of the parent object.

public function registerEventListeners() : void {
    parent.addEventListener(CTAClickEvent.CTA_CLICK_EVENT, onCTAClickHandler);
}

只要确保不调用registerEventListeners时，父母可能为空。

Just be sure not to invoke registerEventListeners when parent might be null.

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