[Qt-interest] QTableWidgetItem with Validator (only numbers) and Range

[Matthias Pospiech]

I want to have cells in a QTableWidget that accept only numbers in a 
specified range. Think of a QDoubleSpinBox without the buttons.

I could not see from the docs that such functionality is built into the 
QTableWidgetItem. So I tried to add a QDoubleSpinBox instead of a QString
for the constructor, but that fails.

            QDoubleSpinBox * spinbox = new QDoubleSpinBox(this);
            spinbox->setRange(0,20000);
            spinbox->setDecimals(2);
            spinbox->setValue(power);
            newItem = new QTableWidgetItem(spinbox);

instead of

            newItem = new QTableWidgetItem(QString("%1").arg(power));

So, how do I add the functionality of the QDoubleSpinBox into the 
QTableWidgetItem. The docs say something about subclassing, but I have 
no idea how that should possibly look like. Exept that I could reinvent 
the wheel and copy most of  QDoubleSpinBox  code  into  a subclassed  
class of QTableWidgetItem...

Seems to me like a standard problem. Maybe someone has a solution for me?

Matthias