void QGraphicsItem::setCursor ( const QCursor & cursor )
Sets the current cursor shape for the item to cursor. The mouse cursor will assume this shape when it's over this item. See the list of predefined cursor objects for a range of useful shapes.
An editor item might want to use an I-beam cursor:
item->setCursor(Qt::IBeamCursor);
If no cursor has been set, the cursor of the item beneath is used.
Просто задаеш курсор етой функцией