GUI filter keyboard input

Questions
#1

So, I’m trying to avoid none English chars on input using the Dirty Larry. And correct me if I wrong, but I can’t lock input on mobile devices. So my question is can I intercept any keyboard input before it will be rendered and filter to allow English only chars or must I stick to validation after some button/enter was hit?

Thanks in advance.

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#2

Dirty Larry is open source so you can modify the code to your liking.

If you were to use Gooey instead (perhaps with the Dirty Larry theme) there’s an option to specify allowed characters.

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#3

Thanks