检测 JPanel 上的鼠标移动事件
我有一个 JPanel，我想检测以下事件
(1) 当鼠标移入时
(2) 当鼠标移出时
(1) 非常简单。 (2)有点棘手。 目前，我必须在 JPanel 周围的所有组件上注册事件。 如果 JPanel 周围的邻居检测到鼠标移动事件，这也意味着 JPanel 处于 (2) 的情况。 然而，这是一个相当肮脏的方法，当我将来添加新组件时，这个肮脏的解决方法将会被破坏。
另一种方法是使用计时器来监视 JPanel。 如果鼠标位置在 x 秒内不在 JPanel 内，我可以认为 JPanel 发生了鼠标移出事件。
然而，这对我来说似乎也是一种肮脏的方式，因为有一个单独的计时器来执行这样的常见任务是矫枉过正的。
有没有更好的方法，哪个Java平台可以提供？
I have a JPanel, which I would like to detect the following events
(1) When the mouse move in
(2) When the mouse move out
The (1) is quick easy. (2) is a bit tricky. Currently, I have to register event at all the components around JPanel. If the neighbor around JPanel detected a mouse move in event, this also means that JPanel is having (2) situation. However, this is a rather dirty away, as I add in new components in the future, this dirty workaround will break.
Another method is to have a timer to monitor the JPanel. If the mouse position is not within JPanel within x seconds, I can consider JPanel is having mouse move out event.
However, this seem a dirty way to me too, as having a separate timer to perform such common task is overkill.
Is there any better way, which Java platform may provide?
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让您的类实现 MouseListener 并将其添加为最外层面板上的鼠标侦听器。 当鼠标在面板上移动时，您应该收到鼠标进入事件，当鼠标离开面板时，您应该收到鼠标退出事件； 无论面板包含什么组件。
来自 JavaDoc：
Have your class implement MouseListener and add it as a mouse listener on the outermost panel. You should get a mouse-entered event when the mouse moves over the panel, and mouse-exited when it leaves; regardless of whatever components the panel contains.
From the JavaDoc: