How to create a caret in a widget which has no inputbox?

[Michael_BJFU]

Thanks for your reply. You mean there's no convenient way to solve the problem? eh, OK. I think I should make the background transparent.
In addition, if I want to get the Asian Charactor using a local input software, what should I do? In the function "keyPressEvent" and get it by the event->key()? But it doesn't work so well.

[Oleg]

Maybe I misuderstood your question, but Qt can handle Asian characters without problems, so you can simply work with QString.