QCheckBox in QTreeWidget

[Kode.Cooper]

Hi there,
I'm add a QCheckBoxin my QTreeWidget like these, but, How to set the widget to be center of the column rect?

treeWidget->setItemWidget(subItem, 2, chkItem);
subItem->setTextAlignment(2, Qt::AlignHCenter);
Qt::CheckState chkState = (bNeedSync.toInt() == 1) ? Qt::Checked : Qt::Unchecked;
chkItem->setCheckState(chkState);

treeWidget->setItemWidget(subItem, 2, chkItem);
subItem->setTextAlignment(2, Qt::AlignHCenter);
Qt::CheckState chkState = (bNeedSync.toInt() == 1) ? Qt::Checked : Qt::Unchecked;
chkItem->setCheckState(chkState);

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I digged the code and this forum and no without any tip information. Thanks.
image.PNG

[aamer4yu]

You will need to use your own delegate. Look for QItemDelegate and QStyledItemDelegate. In that you will need to set the position for check and draw.

[Kode.Cooper]

You will need to use your own delegate. Look for QItemDelegate and QStyledItemDelegate. In that you will need to set the position for check and draw.

Accturally, I don't know how to set the rect of the checkbox item. I use QTreeWidget with QStyledItemDelegate instead of QTreeView, you know, in Model-View, I can control every thing I need.
But in QTreeWidget, It seems not easy for handle this.

I wrote an example in my QStyleItemDelegate subclass,

void CMTreeDelegate::paint( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
    Q_ASSERT(index.isValid());
 
    QStyleOptionViewItem opt = option;
    // draw the check box
    if ( index.column() == 2 )
    {
        return;
    }
 
    QStyledItemDelegate::paint(painter, opt, index);
}

void CMTreeDelegate::paint( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
    Q_ASSERT(index.isValid());

    QStyleOptionViewItem opt = option;
    // draw the check box
    if ( index.column() == 2 )
    {
        return;
    }

    QStyledItemDelegate::paint(painter, opt, index);
}

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The check box still showen in the column. obviousely, the delegate can not control the rect of the Checkbox which created with

treeWidget->setItemWidget(subItem, 2, chkItem);
      subItem->setTextAlignment(2, Qt::AlignHCenter);
      Qt::CheckState chkState = (bNeedSync.toInt() == 1) ? Qt::Checked : Qt::Unchecked;
      chkItem->setCheckState(chkState);

treeWidget->setItemWidget(subItem, 2, chkItem);
      subItem->setTextAlignment(2, Qt::AlignHCenter);
      Qt::CheckState chkState = (bNeedSync.toInt() == 1) ? Qt::Checked : Qt::Unchecked;
      chkItem->setCheckState(chkState);

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[aamer4yu]

Am not sure how to do with QStyledItemDelegate. But with QItemDelegate you need to set the rect in option.,, and then call drawCheck.
Look into Qt source code,,, you will get an idea of what calls are done to do the drawing