How to remove border around QGraphicsItem when selected?

Question

Pretty basic question but I couldn't find a solution through google. In QT when a graphics item is selected, there's a border around it. I was wondering how I can set this border to be invisible. Thanks.

Gong

Answer 1

There's no interface to disable the drawing of the selection border for the build-in QGraphicsItems. The only way I can think of is derive your own items from the build-in ones and override the paint() function:

void MyRectItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    QStyleOptionGraphicsItem myOption(*option);
    myOption.state &= ~QStyle::State_Selected;
    QGraphicsRectItem::paint(painter, &myOption, widget);
}

It's not tested but basically you make a copy of option passed and clear the selection state flag before passing it to the actual paint().

Etienne

Stephen. I will try this when I get home. Thanks! – Gong

Doesn't work in Qt 5.15, but myOption.state = QStyle::State_None; seems to do the trick. – Fourth

Answer 2

If your QGraphicsItem is derived from QAbstractGraphicsShapeItem then you can simply disable its pen, example:

myShape->setPen(Qt::NoPen);

Louden

Answer 3

for those trying to figure it out using python:

def paint(self, painter, option, a):
    option.state = QStyle.State_None
    return super(MyClassName, self).paint(painter,option)

Pietrek

PyQt6: option.state = QStyle.StateFlag.State_None – Laster