Design of On-screen Keyboard

[王鹏]

How to design a On-screen Keyboard under Linux?And what is the theory of On-screen Keyboard?.Can you gei me a example please?A simple example will be OK,like this,if I press the button on screen,then,it will input a "1" or "a" into the gedit.Thanks for all !!!

 

如何在LINUX下实现一个屏幕键盘，原理是什么？举个简单的例子就好，比如我点击屏幕上的一个按钮，就会向gedit或其他编辑器中输入一个"1"或"A"什么的。先谢谢大家的帮助！！！
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以上。
王鹏
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