Add a QCheckBox as a header to a QTableWidget

[hbatalha]

@mrjj said in Add a QCheckBox as a header to a QTableWidget:

model->setHeaderData(section, orientation(), true/false, Qt::CheckStateRole);

what would be the value of section?

[mrjj]

@hbatalha
just 0,1,2,3,4 for the sections.
unless you allow drag to reorder then you have to use
https://doc.qt.io/qt-5/qheaderview.html#visualIndex
to map to the right index/ID

[hbatalha]

@mrjj I gave it 0.

Everything is working perfect.

Thank you all!!!

[lisukovigor492]

@mrjj just 0,1,2,3,4 for the sections.
unless you allow drag to reorder then you have to use
https://doc.qt.io/qt-5/qheaderview.html#visualIndex https://www.worktime.com/employee-time-tracking-software
to map to the right index/ID

Hello,
the question is too simple, but I'm a beginner, please tell me what parameters of the indexer should be?

Thank you

[mrjj]

@lisukovigor492
Hi
you mean for the
int QHeaderView::visualIndex(int logicalIndex) ?

well its for when its reordered. then say index 5 is in front and then comes 2 and so on.
The issues is they are no longer in order.

so you use

int realIndex = HeaderView->visualIndex(0)
and IF the header is reorderd it will then tell you what index is a section 0.
like 7. or what ever what dragged there.

there is also
int QHeaderView::logicalIndex(int visualIndex)

I might recall it reverse. :) but they allow to map between the sections you see on screen and their real Id/indexs.

But this is only important if you allow user to move the sections around.

To get to know them, you could enable it and then
drag some around and the see what therse functions returns for the sections.

its all just integers values so nothing fancy at all.

[hbatalha]

@Chris-Kawa is there a way to change the checkbox border and mark color so it doesn't look grayed out

I have tried

QPalette p(Qt::black);
style()->polish(p);

painter->setPen(Qt::black);
painter->setBrush(Qt::back);

option.palette = QPalette(Qt::black);

But none of the above worked.
Is there a way to change its color?

[Chris Kawa]

@hbatalha It's an image so changing pen, brush or palette doesn't affect it. It might appear disabled if you give it the wrong state flags when painting, so check that the state member is set correctly in the style option.
The checkbox also appears crooked in your screenshot, which suggests the rect member is set incorrectly, so again make sure you set all the members of your style options object correctly before painting with it.

[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?