abandoning/reverting changes in a QDialog

[mzimmers]

Hi all -

I'm writing an app that uses a QDialog to edit a row in a QAbstractItemModel. I just realized that if I make changes to some fields, then hit cancel, my changes are retained. This is probably a side effect of working directly in the model, but I can't have this. Is there a standard way of handling this?

[SGaist]

Hi,

You can use QDataWidgetMapper with the submitPolicy set to ManualSubmit. That way you fully control when the changes are sent to your model.

[mzimmers]

Oh, that's a thing of beauty.

    QDataWidgetMapper *m_mapper;
    ...
    m_mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
    ...
    if (buttonPushed == QMessageBox::Save)
    {
        // we specified manual submit policy in c'tor,
        // so we need to call submit() here.
        m_mapper->submit();

Thanks, SGaist.