How can I add a checkbox/radio button to QTableWidget

There are two methods:

void QTableWidget::setCellWidget(int row, int column, QWidget* widget)

and

void QListWidget::setItemWidget(QListWidgetItem* item, QWidget* widget)

They allow to insert any widget and other controls that inherit QWidget. Checkbox/radio button/combobox do inherit from QWidget.

For a checkbox using the item's setCheckState method should do what you need both for list and table widgets. See if code below would work for you:

List widget:

QListWidgetItem *item0 = new QListWidgetItem(tr("First"), listWidget);
QListWidgetItem *item1 = new QListWidgetItem(tr("Second"), listWidget);

item0->setCheckState(Qt::Unchecked);
item1->setCheckState(Qt::Checked);

Table widget:

QTableWidgetItem *item2 = new QTableWidgetItem("Item2");
item2->setCheckState(Qt::Checked);
tableWidget->setItem(0, 0, item2);

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You can use delegates (QItemDelegate) for other types of editor's widgets, example is here: Spin Box Delegate Example.

I hope this helps.