how can I know cursor in an editable field?

[marslee_suc]

Hi all,
I am working on an onscreen keyboard, I want it can call itself when end-user click an editable field such as editline or text field when focus leave editable field keyboard can hide itself. what should I do, I think X can know If user enter an editable field, but I don't how to deal with it. Is there any application used same technique? Is there any example? 

Thank you in advance.

BR,
Edward.
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