Add a QCheckBox as a header to a QTableWidget

[hbatalha]

@Chris-Kawa said in Add a QCheckBox as a header to a QTableWidget:

so again make sure you set all the members of your style options object correctly before painting with it.

The code is like the one you provided in your answer above:

class CheckBox : public QHeaderView
{
    Q_OBJECT

public:
    using QHeaderView::QHeaderView;

signals:
    void clicked(bool);

protected:

    void paintSection(QPainter* painter, const QRect &rect, int logicalIndex) const override
    {
        painter->save();
        QHeaderView::paintSection(painter, rect, logicalIndex);
        painter->restore();

        if (model() && logicalIndex == 0)
        {
            QStyleOptionButton option;
            option.initFrom(this);

            QRect checkbox_rect = style()->subElementRect(QStyle::SubElement::SE_CheckBoxIndicator, &option, this);
            checkbox_rect.moveLeft(rect.left());

            bool checked = model()->headerData(logicalIndex, orientation(), Qt::CheckStateRole).toBool();

            option.rect = checkbox_rect;
            option.state = checked ? QStyle::State_On : QStyle::State_Off;

            style()->drawPrimitive(QStyle::PE_IndicatorCheckBox, &option, painter);
        }
    }

public:

    void mouseReleaseEvent(QMouseEvent* event) override
    {
        QHeaderView::mouseReleaseEvent(event);
        if(model())
        {
            int section = logicalIndexAt(event->pos());
            if (section >= 0)
            {
                bool checked = model()->headerData(section, orientation(), Qt::CheckStateRole).toBool();
                model()->setHeaderData(section, orientation(), !checked, Qt::CheckStateRole);
                viewport()->update();
                emit clicked( ! checked);
            }
        }
    }
};

Edit: The problem is only on windows for the looks of it as I just tested it on linux mint 20.1 and it looks totally fine

[nonskill]

No one mentioned how to add Checkbox in QTableWidget header with PartiallyChecked support, anyone knowns how to make it? There only option for Checkbox is just QStyle::State_On and QStyle::State_Off, which is far from functional. The most important option QStyle::State_Partial is not found.

[JonB]

@nonskill
Did you try QStyle::State_NoChange ("Used to indicate a tri-state checkbox.") from flags QStyle::State?