（3）键盘焦点（Keyboard Focus）在使用KeyEvent之前，需要界面组件或者容器具有键盘焦点。
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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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A window is about to receive the keyboard focus.
窗体即将接收键盘焦点。
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To test exposing the keyboard focus, run Magnifier.
若要测试公开键盘焦点，请运行放大镜。
Each element receives keyboard focus, as long as it is a navigation stop.
对于每个元素，只要它是导航停止位，就可以接收键盘焦点。
By and large, manufacturers and carriers alike have shifted their focus away from keyboard-equipped smartphones, and you'll rarely find more than one option on any given carrier.
ENGADGET: 's smartphone buyer's guide: fall 2012 edition
My only hope for Windows 8 now is that Microsoft comes to its senses and allows us to customize Windows 8 to focus more on the keyboard and mouse.
FORBES: Why Windows 8 Is The First Windows Release I Absolutely Hate
Sprint has decided to focus solely on the QWERTY keyboard-packing Q10.
FORBES: No BYOD? BlackBerry Z10 Pre-Order Today/Tomorrow
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