Is too bad idea to create a widget with the QCreator an use it to render all I need? (To avoid doing it manually)
Here is an example

Qt Code: 
  1. class CustomItemDelegate : public QStyledItemDelegate
  2. {
  3. 	WidgetItem * witem;
  4. public:
  5.  
  6. 	CustomItemDelegate()
  7. 	{
  8. 		witem = new 	WidgetItem ();
  9. 	}
  10.  
  11. 	~CustomItemDelegate()
  12. 	{
  13. 		delete witem;
  14. 	}
  15.  
  16.  
  17. 	void paint(QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index) const
  18. 	{
  19. 		witem->resize(option.rect.size());
  20.  
  21. 		/*
  22.                Here update the witem with some method with the real item data
  23.                Update labels, icons, and so on
  24.                */
  25.  
  26. 		painter->save();
  27. 		painter->translate(option.rect.topLeft());
  28. 		witem->render(painter);
  29. 		painter->restore();				
  30. 	}
  31. }
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Note that the widget is create just once and then all its components updated