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.