How to prevent changing selection in QtableView, if the data is invalid?

[ras123]

Hi,
When adding new data to QtableView/QRelationalTableModel, I need to verify the data entered by the user. The verification is done by using QValidator, but how can I prevent changing from that cell if the data is invalid, and to instruct user to correct the data?
Thanks in advance,
Ras

[tucnak]

Hi, ~ras123!

If I correctly understand what do you want - you should use proxy model. It's allow to set some kind of controll between model and view.

Sorry if I misunderstood.

[ras123]

Proxy doesn't give the result. I need to validate data, at the instant on user submitted it. If it is valid, then move to next column, otherwise stay there. I think this is related to the QTableViw rather than the associated model.

[lgeyer]

Reimplement the focusOutEvent for the input widget and setFocus() if there is no acceptable input. You can then use a custom delegate to show your input widget.

@
class LineEdit : public QLineEdit
{
Q_OBJECT

public:
LineEdit(QWidget *parent = 0) : QLineEdit(parent) {}

protected:
void focusOutEvent(QFocusEvent *event)
{
if (((currentFocus_ == this) || (currentFocus_ == 0)) &&
(hasAcceptableInput() == false))
{
currentFocus_ = this;
setFocus();
}
else
{
currentFocus_ = 0;
QLineEdit::focusOutEvent(event);
}
}

private:
static LineEdit *currentFocus_;
};

LineEdit *LineEdit::currentFocus_ = 0;
@
Brain to terminal. Not tested.

[ras123]

Thanks, I am looking for a similar solution. Since it is a table, and its validation depends on the current column, how to find the column number from the above approach? Or is it possible to similar programming for QtableView?