Problem with boundingRect() method

[issam]

Hi,

In a QGraphicsScene instance I want to create a QGraphicsSimpleTextItem (label) as a child item of a
QGraphicsRectItem (Rectangle). So, I have to set the width and the height of the rectangle (the parent) to the width and the height of the label.

the boundingRect() of the label class :
@
MyLabel::QRectF boundingRect() const
{
return QGraphicsSimpleTextItem::boundingRect();
}
@

and in the Rectangle:
@
QRectF GraphNode::boundingRect() const
{
qreal a = (pen().width())/2;
return QRectF(-1, -1, label->boundingRect().width()+12, label->boundingRect().height()+12)
.normalized()
.adjusted(-a, -a, a, a);
}
@

I created a QTabWidget instance as the central area of the MainWindow. Each tab of the tabwidget contain a GraphicsScene. When I close a tab, the application crash with this error :

@
pure virtual method called
terminate called without an active exception
Aborted
@

The Qt Creator indicate that the problem is in this line:

@
return QRectF(-1, -1, label->boundingRect().width()+12, label->boundingRect().height()+12)
@

Please, help.

thanks in advance.