Buffer form modifications before commiting them to the model

gchauvie

Hello,

I want to edit some object in a form that have an ok and a cancel button. I have a QObject with property exposed to the QML (name, surname, ...) and this QObject has a reference to a Person object.
What I have at first is something like that :

Q_PROPERTY (QString name READ getName WRITE setName NOTIFY nameChanged)

QString PersonViewModel::getName    ()      const
{
    return person->getName();
}

void PersonViewModel::setName      (QString     i_value)
{
    person->set_name(i_value);
    emit nameChanged(i_value);
}

The issue is that I want to be able to rollback all the modifications made on the form if I click on the cancel button and I want to call the person->setName() only after the user clicks on the ok button.
I thought of overriding the setProperty method to store all the modification in a map and return the value stored in the map like that

QString PersonViewModel::getName    ()      const
{
if(map.contains("name")
{
return map.value("name");
}
else
{
    return person->getName();
}
}

void PersonViewModel::setName      (QString     i_value)
{
map.insert("name", i_value);
}

void PersonViewModel::commitChanges()
{
if(map.contains("name")
{
    person->set_name(map.value("name");
    emit nameChanged(i_value);
}
map.clear();
}

Is it ok or is there a more desirable way of doing it with QT ?

Thanks.

VRonin

The usual way to do this is to put the editor in a QDialog, call QDialog::exec() and check if it returns QDialog::Accepted (i.e. ok was clicked)
if you need modeless processing you can create the dialog (without binding the properties) and then call setName in a slot connected to the accepted() signal.

If you show your "form" code and how you call it we can be more specific