I created two objects (node and line - derived from QGraphicsItem). Each line has pointers to its starting and ending node, and each node has pointer to QGraphicsItem in LinkedItems vector.
Problem is when i move node i want to update line item, but i canot call prepareGeometryChange method because is protected. what's the reason of that? does anybody have an idea how to do this?
Qt Code: 
  1. void itdNode::move(qint32 _x, qint32 _y)
  2. {
  3. 	for (qint32 iItem=0;iItem<LinkedItems.size();iItem++)
  4. 	{
  5. //		LinkedItems[iItem]->prepareGeometryChange();
  6. 	}
  7. 	prepareGeometryChange();
  8. 	x=_x;
  9. 	y=_y;
  10. 	update();
  11. 	for (qint32 iItem=0;iItem<LinkedItems.size();iItem++)
  12. 	{
  13. 		LinkedItems[iItem]->update();
  14. 	}
  15. }
  16. void itdNode::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent)
  17. {
  18. 	move(mouseEvent->scenePos().x(),mouseEvent->scenePos().y());
  19. }
To copy to clipboard, switch view to plain text mode