Quote Originally Posted by batileon View Post
Is there any possible reason that an ui will ignore keyboard event?
No, I don't think so.

The case is like this: I am having an ui form, and installed the eventFilter to the form. So if there's key pressed from keyboard, it should run the event filter code. It works well originally, however after some actions, e.g. opening new ui form etc. I found that the event can no longer be detected!
Can we see the code?

How can I know if it is the form that missed the event signal, or there's actually no signal sent from the keyboard?
You can install an event filter on the application object. All events from within the application will be passing through it.