如何访问可绑定 Flex 对象的隐式事件调度程序？

发布于 2024-08-23 16:09:10 字数 206 浏览 2 评论 0原文

如果我创建一个像这样的对象：

class Foo {
    [Bindable] public var property: String;
}

Foo 类有一个隐式事件调度程序来处理属性更改事件。如何在不使 Foo 显式扩展 EventDispatcher 的情况下访问它？

原文

If I create an object like so:

class Foo {
    [Bindable] public var property: String;
}

The class Foo has an implicit event dispatcher to handle property change events. How can I access that without making Foo explicitly extend EventDispatcher?

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演出会有结束 2024-08-30 16:09:10

如果将 -keep 参数添加到编译行，您将能够看到它生成的内容。但为了快速解释它，您可以像处理常规 EventDisaptcher 一样处理它。

因此，在您的主文件中，您可以粘贴以下内容：

function callFirst(event:FlexEvent):void
{
   foo.addEventListener(PropertyChangeEvent.PROPERTY_CHANGE,test);
   foo.property = 'something';
}

function test(E:Event):void
{
   trace (ObjectUtil.toString(E));
}

将打印出：

(mx.events::PropertyChangeEvent)#0
  bubbles = false
  cancelable = false
  currentTarget = (Foo)#1
    property = "something"
  eventPhase = 2
  kind = "update"
  newValue = "something"
  oldValue = (null)
  property = "property"
  source = (Foo)#1
  target = (Foo)#1
  type = "propertyChange"

If you add the -keep parameter to your compile line you will be able to see what it generates. But to explain it quickly you can just handle it like it would be a regular EventDisaptcher.

So in your main file you can paste this:

function callFirst(event:FlexEvent):void
{
   foo.addEventListener(PropertyChangeEvent.PROPERTY_CHANGE,test);
   foo.property = 'something';
}

function test(E:Event):void
{
   trace (ObjectUtil.toString(E));
}

Will print out:

(mx.events::PropertyChangeEvent)#0
  bubbles = false
  cancelable = false
  currentTarget = (Foo)#1
    property = "something"
  eventPhase = 2
  kind = "update"
  newValue = "something"
  oldValue = (null)
  property = "property"
  source = (Foo)#1
  target = (Foo)#1
  type = "propertyChange"

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