自己写的键盘控件，仿照别人的做的，基本功能已经完成，输入采用控件的事件方式，可以在没有焦点的情况下输入，改控件正在完善，后续还会加上拼音和手写功能-Write their own keyboard control, modeled after the other people do, the basic function has been completed, the input of the event using the control, you can not focus on the c