[Qt-interest] Struggling with QLineEdit / QValidator behaviour

[Florian Delizy]

For those who struggle like me, looking at qt sourcecode, I found the answer
:

QStyledItemDelegate::eventFilter filters the Key_Return/Key_Enter and
discard the editor, thus overloading this function to prevent it to discard
the editor does the trick

2010/6/19 Florian Delizy <florian.delizy at gmail.com>

> I don't need the validator but when i do that as i say the linedit
> disappear ... I ha e no way to prevent the tableview (or the delegate ?)
> from discarding the editor
>
> I tried to surcharge pretty much all the related delegate methods but found
> nothing
>
> Once the return key is pressed the editor (in that case the lineedit) is
> discarded
>
> Envoyé de mon iPhone
>
> Le 19 juin 2010 à 15:06, Chris Wilson <christopher.g.wilson at gmail.com> a
> écrit :
>
> 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#returnPressed
> <http://doc.qt.nokia.com/4.6/qlineedit.html#editingFinished>
> 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>
> 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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>


-- 
Florian Delizy
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