How to add a spinbox column and combo box column in QTableWidget or QTableView?

[A Former User]

@VRonin said in How to add a spinbox column and combo box column in QTableWidget or QTableView?:

Would you want the Spin/Combo box to be always visible or just while you are editing?

combobox always visible , spinbox while editing

[VRonin]

@davidlabib said in How to add a spinbox column and combo box column in QTableWidget or QTableView?:

spinbox while editing

class SpinBoxDelegate : public QStyledItemDelegate{
    Q_OBJECT
    Q_DISABLE_COPY(SpinBoxDelegate)
public:
    explicit SpinBoxDelegate(QObject* parent = Q_NULLPTR) 
        :QStyledItemDelegate(parent)
    {}
    QWidget* createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE
    {
        Q_UNUSED(option)
        Q_UNUSED(index)
        return new QSpinBox(parent);
    }
    void  setEditorData(QWidget *editor, const QModelIndex &index) const Q_DECL_OVERRIDE
    {
        qobject_cast<QSpinBox>(editor)->setValue(index.data().toInt());
    }
    void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const Q_DECL_OVERRIDE
    {
        model->setData(index,qobject_cast<QSpinBox>(editor)->value());
    }
    void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE
    {
        Q_UNUSED(index)
        editor->setGeometry(option.rect());
    }
    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE
    {
        qApp->style()->sizeFromContents(
                QStyle::CT_SpinBox,
                &option,
                QSize(option.fontMetrics.horizontalAdvance(displayText(index.data(),option.locale)), option.fontMetrics.height())
        );
    }
};

combobox always visible

same as above but you also have to reimplement paint and fill in manually a QStyleOptionComboBox. It's tedious but if you get stuck I'm happy to help.

To use the delegate you can call something like tableView->setItemDelegateForColumn(0,new SpinBoxDelegate(tableView));

[Christian Ehrlicher]

@VRonin said in [How to add a spinbox column and combo box column in QTableWidget or QTableView?]:

When did you switch to the dark side @Christian-Ehrlicher ?

but you also have to reimplement paint and fill in manually a QStyleOptionComboBox

Because of this stupid limitation of the QStyledItemDelegate - I can't show the editor the whole time without custom painting and the up/down spinboxes also don't work well if the item doesn't have the focus. Maybe a task for you for Qt6 ;)

[VRonin]

@Christian-Ehrlicher Fair enough, when the widget to paint becomes complex the process is a nightmare, I agree.

---

For a quick and dirty workaround without using setItemWidget, you can check https://pastebin.com/XrppLZ3m

[A Former User]

@VRonin said in How to add a spinbox column and combo box column in QTableWidget or QTableView?:

class SpinBoxDelegate : public QStyledItemDelegate{
Q_OBJECT
Q_DISABLE_COPY(SpinBoxDelegate)
public:
explicit SpinBoxDelegate(QObject* parent = Q_NULLPTR)
:QStyledItemDelegate(parent)
{}
QWidget* createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE
{
Q_UNUSED(option)
Q_UNUSED(index)
return new QSpinBox(parent);
}
void setEditorData(QWidget *editor, const QModelIndex &index) const Q_DECL_OVERRIDE
{
qobject_cast<QSpinBox>(editor)->setValue(index.data().toInt());
}
void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const Q_DECL_OVERRIDE
{
model->setData(index,qobject_cast<QSpinBox>(editor)->value());
}
void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE
{
Q_UNUSED(index)
editor->setGeometry(option.rect());
}
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const Q_DECL_OVERRIDE
{
qApp->style()->sizeFromContents(
QStyle::CT_SpinBox,
&option,
QSize(option.fontMetrics.horizontalAdvance(displayText(index.data(),option.locale)), option.fontMetrics.height())
);
}
};

Alot of errors

[VRonin]

It's all easy to solve.

• qobject_cast<QSpinBox> should be qobject_cast<QSpinBox*>
• option.rect() should be option.rect

[A Former User]

@VRonin

error: use of undeclared identifier 'tableView'

[A Former User]

This post is deleted!

[VRonin]

@davidlabib said in How to add a spinbox column and combo box column in QTableWidget or QTableView?:

@VRonin

error: use of undeclared identifier 'tableView'

°_°

Did you even try to have a guess at what's wrong?! It's super easy. instead of tableView it should be ui->tableView or even a simple this will work

[A Former User]

@VRonin how can i make the spinbox always visible

[VRonin]

You need to reimplement paint, fill a QStyleOptionSpinBox and use the style to paint the control

[A Former User]

@VRonin give me an example please