java - windowActivated 和 windowFocusGained 之间的区别

Question

windowActivated 方法(从 WindowListener 实现)和 windowGainedFocus(从 WindowFocusListener 实现)之间的主要区别是什么？

Java 文档说:

窗口获得焦点:

Invoked when the Window is set to be the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.

窗口激活:

Invoked when the Window is set to be the active Window. Only a Frame or a Dialog can be the active Window. The native windowing system may denote the active Window or its children with special decorations, such as a highlighted title bar. The active Window is always either the focused Window, or the first Frame or Dialog that is an owner of the focused Window.

但是有什么区别呢？或者正如它所说，聚焦窗口是一种激活窗口？

提前致谢!

Answer 1

来自How to Write Window Listeners这也反射(reflect)了您问题中的引用:

windowActivated(WindowEvent) and windowDeactivated(WindowEvent):

Called just after the listened-to window is activated or deactivated, respectively. These methods are not sent to windows that are not frames or dialogs. For this reason, the windowGainedFocus and windowLostFocus methods to determine when a window gains or loses the focus are preferred.

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因此，windowActivated仅在窗口是框架或对话框时执行，而windowGainedFocus适用于所有类型。