QTableWidgetItem will use a spinbox for editor automatically if setData is called

jronald

Env

Linux x86-64
Qt 6.2.0

Problem

For QTableWidget
If let every cell empty initially, the editor for each item is QLineEdit.
If use QTableWidgetItem::setData(Qt::DisplayRole, 123) to set some item values, the editor for each of these items becomes QSpinBox instead of QLineEdit.

Question

Why does it create QSpinBox in the latter case?
How to use QLineEdit as editor in the latter case?

JonB

@jronald
Because 123 is a number. Use "123" if you want to prevent this.

jronald

@JonB said in QTableWidgetItem will use a spinbox for editor automatically if setData is called:

Because 123 is a number. Use "123" if you want to prevent this.

Solved, thanks.

BTW, the QSpinBox looks as below

Why "1" on the right side of the spin box?

JonB

@jronald
BTW (before somebody comments), for the original question I picked the "simplest" way. If you want your data to actually stay as a number but change the editing behaviour only, you could do it via QTableWidget::setItemDelegate(), as per e.g. @VRonin's https://forum.qt.io/topic/71692/using-setdata-qt-editrole-xxx-with-qtablewidgetitem/2. But more work.

For your pic I don't know. I don't see it like that under Linux. Is that what a QSpinBox normally looks like for you? Looks like the 1 on the right-hand side between the arrows is the current value where you change it, I don't know.

jronald

@JonB

It's not a typical problem, I will write a demo and post a new issue for it.

Thanks

VRonin

@jronald said in QTableWidgetItem will use a spinbox for editor automatically if setData is called:

Why does it create QSpinBox in the latter case?

Because it uses QItemEditorFactory and the standard editing widget for int is a QSpinBox according to the docs

How to use QLineEdit as editor in the latter case?

class IntLineEditCreator : public QItemEditorCreatorBase {
public:
IntLineEditCreator() = default;
QWidget* createWidget(QWidget *parent) const override{
return new QLineEdit(parent);
}
QByteArray valuePropertyName() override{ return QByteArrayLiteral("text"); }
};

then you can use it with something like:

IntLineEditCreator* creator  = new IntLineEditCreator;
QItemEditorFactory *factory = new QItemEditorFactory;
factory->registerEditor(QMetaType::Int, creator);
factory->registerEditor(QMetaType::UInt, creator);
tableWidget->delegate()->setItemEditorFactory(factory);
connect(tableWidget,&QObject::destroyed,[creator,factory](){delete creator; delete factory;});

jronald

@VRonin said in QTableWidgetItem will use a spinbox for editor automatically if setData is called:

class IntLineEditCreator : public QItemEditorCreatorBase {
public:
IntLineEditCreator() = default;
QWidget* createWidget(QWidget *parent) const override{
return new QLineEdit(parent);
}
QByteArray valuePropertyName() override{ return QByteArrayLiteral("text"); }
};

then you can use it with something like:
IntLineEditCreator* creator = new IntLineEditCreator;
QItemEditorFactory *factory = new QItemEditorFactory;
factory->registerEditor(QMetaType::Int, creator);
factory->registerEditor(QMetaType::UInt, creator);
tableWidget->delegate()->setItemEditorFactory(factory);
connect(tableWidget,&QObject::destroyed,creator,factory{delete creator; delete factory;});

Awesome, thanks