QPlainTextEdit and input filtering

[wysota]

I still can e.g. press AltGr-0 and get a "}" -> AltGr doesn't seem to be catched by modifiers()

It should be.

Do I really have to check all those keycodes and let them though? This seems odd to me.

What would not seem odd to you?

I think that playing with the key codes it too low level for my purpose...

What is the purpose? What if I paste some text which is not composed from 0 and 1? Is it valid or not? If not, then you have to check the contents of the text edit each time it changes using the QTextDocument::contentsChange() signal and simply correct the changes you don't want. Note that you may wreck undo/redo with this though.

[paul.schwann]

It should be.


What would not seem odd to you?

What is the purpose? What if I paste some text which is not composed from 0 and 1? Is it valid or not? If not, then you have to check the contents of the text edit each time it changes using the QTextDocument::contentsChange() signal and simply correct the changes you don't want. Note that you may wreck undo/redo with this though.

Hi Wysota,

I am a bit lost here...

It seems odd to me that I have to fiddle with tons of conditions although all I want is to avoid some text appear in the editor field. Why do I have to take care about all the control keys (which I don't even know)?

Regarding the copy/paste problem: I expect to be able to hook into the copy/paste functions of the QPlainTextEdit and either filter all non-0/1 characters out of the text being pasted or at least reject the pase action if other than 0/1 is in the text.

Let me ask another question: What function is called (and thus, I can override) if the QPlainTextEdit is supposed to insert/append additional text (or set new text)? Is there a single function responsible for this?
This function might also be part of the QTextDocument instead of the QPlainTextEdit.
-- I wasn't able to locate such a function (it may exist or not).

Thanks & Regards,
Paul