How to create grid line in QTreewidget

[ManiRon]

I am trying to implement grid lines between the columns in a QTreeWidget, whether it is possible . Help me with this ?

[mrjj]

Hi
Do you mean like this

[ManiRon]

@mrjj I meant like a table but it should be a Tree widget

Need grid in between row and columns

[Christian Ehrlicher]

This is not supported out-of-the box, you have to paint it by your own - either by reimplementing paintEvent() or maybe with a QStyledItemDelegate. But both are not trivial (for you)

[ManiRon]

This post is deleted!

[mrjj]

Hi
It was a treewidget with multiple columns :)

maybe easier to see here

anyway, this is a Delegate as @Christian-Ehrlicher talks about.

class GridDelegate : public QStyledItemDelegate
{
public:
    explicit GridDelegate(QObject * parent = nullptr) : QStyledItemDelegate(parent) { }

    void paint(QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
    {
       painter->setPen(QColor(Qt::black)); // set ink to black
        painter->drawRect(option.rect);  // draw a rect covering cell area     
        QStyledItemDelegate::paint(painter, option, index);  // tell it to draw as normally after
    }
};

and you apply it via
ui->treeWidget->setItemDelegate(new GridDelegate);

However, this is a very simple example. it just
draws a box on the cell area.
You might want to to be slightly differnt for the the effect you want.