AS3 [Event(name="", type="")]，有什么意义？

发布于 2024-07-15 19:44:16 字数 525 浏览 5 评论 0 原文

我使用 FlashDevelop3 R2 和 Flex 3.3 SDK 进行开发，在很多情况下我必须使用嵌入元数据标签：

  [Embed(source="path/to/file")]
  private var Asset:Class;

我很好地理解上述所有内容，并且我很感激它的存在，因为我不喜欢打开 Flash IDE 太频繁了。

当我最近浏览其他作者的课程时，我发现了一个我不理解的有趣的元数据标签：

[Event(name="", type="")]

我还没有看到我需要这个的情况，而且我真的不明白它的用途。

预先感谢您的帮助。

布莱恩·霍奇
blog.hodgedev.com hodgedev.com

原文

I develop with FlashDevelop3 R2 and the Flex 3.3 SDK and there are many occasions where I must use the embed metadata tag as such:

  [Embed(source="path/to/file")]
  private var Asset:Class;

I understand the above all well and good, and I am thankful it exists because I do not like to open the flash IDE too often.

When I am going through other authors classes lately, I have found an interesting metadata tag that I do not understand:

[Event(name="", type="")]

I have yet to see a situation where I require this, and furthermore I really just do not understand what it is for.

Thank in advance for your help.

Brian Hodge
blog.hodgedev.com hodgedev.com

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尬尬 2024-07-22 19:44:16

这些[Event(name, type)]声明描述了类实例可能调度哪些事件。

它们实际上对于代码完成很有用 - 例如，当您键入：mySprite.addEventListener()时，您的代码编辑器（Flex Builder 或 FlashDevelop）将显示有意义的事件列表，这些事件因此，您可以

在代码中添加这些声明，并从更丰富的代码完成中受益。

另请注意，这适用于自定义事件类（请参阅 FlashDevelop 的新事件类模板）。

package mycomp {
    import flash.events.Event;

    public class MyEvent extends Event {
         public const SOME_EVENT:String = "someEvent";
         // required Event type declarations
    }
}

package mycomp {
     [Event(name="someEvent", type="mycomp.MyEvent")]
     public class MyComp extends Sprite {
     }
}

package myproject {
     import mycomp.MyComp;

     public class MyProject {
          function MyProject() {
                var mc:MyComp = new MyComp();
                mc.addEventLister( //completes: SOME_EVENT + Sprite events
          }
     }
}

These [Event(name, type)] declarations describe which events a class instance is likely to dispatch.

They are actually useful for code completion - for instance when you type: mySprite.addEventListener(, your code editor (Flex Builder or FlashDevelop) will display a meaningful list of events that this object can dispatch.

So you can add these declarations in your code and benefit from a richer code completion.

Also note that this works with custom Event classes (see FlashDevelop's new Event class template).

package mycomp {
    import flash.events.Event;

    public class MyEvent extends Event {
         public const SOME_EVENT:String = "someEvent";
         // required Event type declarations
    }
}

package mycomp {
     [Event(name="someEvent", type="mycomp.MyEvent")]
     public class MyComp extends Sprite {
     }
}

package myproject {
     import mycomp.MyComp;

     public class MyProject {
          function MyProject() {
                var mc:MyComp = new MyComp();
                mc.addEventLister( //completes: SOME_EVENT + Sprite events
          }
     }
}

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