[Qt-interest] Struggling with QLineEdit / QValidator behaviour

[Florian Delizy]

Hi,

I am trying to implement a simple QLineEdit that is blinking red when the
user is entering a wrong input. I got the blinking part right, but it gets
tricky when I actually want the text to be validated *only* when the user
hit Enter/Return. I use that QLineEdit as a Editor inside a TableView widget
(I wrote my own delegate and surcharged createEditor() ).

I tried the following :

- Implement my own QValidator => fail QLineEdit is calling validate() every
single keypress, and I have no way to know if that press was the last one
- Re-implement the keyPressEvent / keyReleaseEvent to catch
Key_Return/Key_Enter missed, for some reason, the key is catched in another
place, and the editor gets discarded before I have a chance to make it
blink.
- Install the validator only after I detect the Key_Return/Key_Enter
keyPressEvent on the editor, missed again, the key is catched in another
place, editor gets discarded validate() is not even called (duh!)

I tried to surcharg keyPressEvent in the TableView as well, but it gets
caught somewhere else (duh !!)

well, I still have the option to re-invent the wheel and implement my full
grown CustomLineEdit from scracth, (including all the existing features of
the QLineEdit) but I think this is quite overkill.

Could somebody point me to the
magicMethodAllowingValidatorToBeCalledOnlyAtInputEnd() ? or something that
would give me some hint on how to achieve that behaviour ?

my next step is to read the code of QLineEdit itself I guess to see if there
are some hidden hooks :(

Thanks,

-- 
Florian Delizy

BTW: I did read QLineEdit/QWidget/QStyledItemDelegate/QTableView assistant
page, a lot of time :/
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