如何发布和处理自定义事件？ [英] How to emit and handle custom events?

问题描述

javafx中有几个预定义的事件类。 Event.ANY，KeyEvent.KEY_TYPED，MouseEvent.any等。还有先进的过滤和处理系统。而且我想重用它来发送一些自定义的信号。

There are several predefined event classes in javafx. Event.ANY, KeyEvent.KEY_TYPED, MouseEvent.ANY and so on. There is also advanced filtering and handling system for events. And I'd like to reuse it to send some custom signals.

如何创建我的自定义事件类型CustomEvent.Any，以编程方式发出此事件并处理它节点？

How can I create my custom event type CustomEvent.Any, emit this event programmatically and handle it in a node?

推荐答案

一般来说：

1. 创建所需的 EventType 。


2. 创建相应的事件。


3. 致电 Node.fireEvent（）。


4. 添加处理程序和/或过滤器

1. Create a desired EventType.
2. Create the corresponding Event.
3. Call Node.fireEvent().
4. Add Handlers and/or Filters for EventTypes of interest.

一些解释：

如果你要创建一个事件级联，从所有或任何类型开始，这将是所有EventTypes的根目录：

If you want to create an event cascade, start with an "All" or "Any" type, that will be the root of all of the EventTypes:

EventType<MyEvent> OPTIONS_ALL = new EventType<>("OPTIONS_ALL");

这样可以创建这种类型的后代：

This makes possible creating descendants of this type:

EventType<MyEvent> BEFORE_STORE = new EventType<>(OPTIONS_ALL, "BEFORE_STORE");

然后写入 MyEvent class 事件）。 EventTypes应该输入到这个事件类（就像我的例子）。

Then write the MyEvent class (which extends Event). The EventTypes should be typed to this event class (as is my example).

现在使用（或换句话说：fire）事件：

Now use (or in other words: fire) the event:

Event myEvent = new MyEvent();
Node node = ....;
node.fireEvent(myEvent);

如果你想抓住这个事件：

If you want to catch this event:

Node node = ....;
node.addEventHandler(OPTIONS_ALL, event -> handle(...));
node.addEventHandler(BEFORE_STORE, event -> handle(...));

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