One thing the example illustrates is that an event is not necessarily an input event.
示例说明了一件事：事件不必是输入事件。
The input event occurred in a menu.
输入事件在菜单中发生。
The input event occurred in a scroll bar.
输入事件在滚动条中发生。
The input event occurred in a message box or dialog box.
输入事件在消息框或者对话框中发生。
The input event occurred in a message box or dialog box.
输入事件在消息框或者对话框中发生。
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