Well, I must say, the updating mechanism of yours is really wicked..

All you really need is:
Qt Code: 
  1. // member variables:
  2. // QPoint offset;
  3. // QPersistentModelIndex index;
  4.  
  5. void RectView::mousePressEvent(QMouseEvent* e)
  6. {
  7. 	index = indexAt(e->pos());
  8. 	offset = index.data().toRect().topLeft() - e->pos();
  9. }
  10.  
  11. void RectView::mouseMoveEvent(QMouseEvent* e)
  12. {
  13. 	if (index.isValid())
  14. 	{
  15. 		QRect r = index.data().toRect();
  16. 		r.moveTopLeft(e->pos());
  17. 		r.translate(offset);
  18. 		model()->setData(index, r);
  19. 	}
  20. }
  21.  
  22. void RectView::mouseReleaseEvent(QMouseEvent* e)
  23. {
  25. }
  26.  
  27. void RectView::paintEvent(QPaintEvent* e)
  28. {
  29. 	QAbstractItemView::paintEvent(e);
  30. 	QPainter painter(viewport());
  31. 	setDirtyRegion(viewport()->rect());
  32.  
  33. 	for (int row = 0; row < model()->rowCount(); ++row)
  34. 	{
  35. 		for (int col = 0; col < model()->columnCount(); ++col)
  36. 		{
  37. 			QModelIndex index = model()->index(row, col, QModelIndex());
  38. 			itemDelegate()->paint(&painter, QStyleOptionViewItem(), index);
  39. 		}
  40. 	}
  41. }
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