[Qt-interest] Struggling with QLineEdit / QValidator behaviour

[Chris Wilson]

Just a thought: Do you have to have a validator on the line edit? Otherwise,
you can just connect to the returnPressed() or the editingFinished()
signals. (though these only work if the validator is returning acceptable)

http://doc.qt.nokia.com/4.6/qlineedit.html#returnPressed
http://doc.qt.nokia.com/4.6/qlineedit.html#editingFinished

On Fri, Jun 18, 2010 at 9:35 PM, Florian Delizy <florian.delizy at gmail.com>wrote:

> 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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