Qt 中的任何一个 Widget 都能够接受输入，只需它能够有键盘聚焦(Keyboard Focus)。所以对特殊 Widget 的输入处理只需要截获键盘输入，获取从XIM服务器 来的字符串。
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这个视频并没有想像中的好，因为它过多的聚焦于这块QWERTY全键盘了。
And the video was not too good as it focused too much on the portrait QWERTY keyboard.
通过点击鼠标按键，滚动滚轮来导航和聚焦窗口和框架，或者完全的通过键盘来操作。
Windows and frames are navigated and focused on any mouse button click, including rolling the wheel, or alternatively driven entirely by the keyboard.
应用程序的“事件循环”会给这个聚焦的对象发送键盘键盘动作、鼠标事件和菜单选择等行为。
The application's "event loop" will send keyboard actions, mouse events and menu selections to this focus object.
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