QGraphicsRectItem's signal itemChange not generating on drag

Question

I have made a custom class derived from QGraphicsRectItem.

class CornerPoint : public QGraphicsRectItem
{
  public:
  CornerPoint(QPointF centre);

 enum { Type = UserType + 1 };

 int type() const{ return Type; }

QVariant itemChange(GraphicsItemChange change, const QVariant &value);

public slots:

void updatePosition(QPointF);

};

CPP File

 CornerPoint::CornerPoint(QPointF centre): QGraphicsRectItem(NULL)
 {
    setPos(55,22);
    setRect(0,0,99,99);
 }

  QVariant CornerPoint::itemChange(QGraphicsItem::GraphicsItemChange change, const QVariant &value)
{
    std::cout << "Change is" << change << std::endl;

     if( QGraphicsItem::ItemPositionChange == change && scene())
     {
        std::cout << "New values " << value.toPointF().x() << value.toPointF().y() << std::endl;
     }

    return QGraphicsItem::itemChange(change, value);
 }

I have made these objects selectable and moveable. But when I drag them, I dont receive the signal for position change of this rectangle. All I receive are the signals with value 4 (ItemSelectedChange) and 14 (ItemSelectedHasChanged).

This post says that I need to enable some flags. But I can't find any example of any one doing this, and using these flags is giving errors.

Answer 1

Crap.

I just had to enable this flag :

setFlag(GraphicsItemFlag::ItemSendsGeometryChanges);