【QT应用】 QApplication::focusWidget与activeWind的区别

 * QApplication::focusWidget ()   [static]

Returns the application widget that has the keyboard input focus, or 0 if no widget in this application has the focus.

 * QApplication::activeWindow ()   [static]

Returns the application top-level window that has the keyboard input focus, or 0 if no application window has the focus. There might be an activeWindow() even if there is nofocusWidget(), for example if no widget in that window accepts key events.

focusWidget返回的是当前活动窗体内聚焦部件的句柄

activeWindow返回的是当前活动窗体整体的句柄