Wow, ok that was too early. Three typos, I am scared... But beside that, my first thought was also false. You have to do the drawing yourself.
Qt Code: 
  1. class PointDelegate : public QStyledItemDelegate
  2. {
  3. public:
  4.     PointDelegate(QObject *parent = 0): QStyledItemDelegate(parent)
  5.     {}
  6.  
  7.     void paint( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
  8.     {
  9.         if (QVariant::Point == index.data().type())
  10.         {
  11.             painter->drawText(option.rect,
  12.                               displayText(index.data(), QLocale::system()),
  13.                               option.displayAlignment);
  14.         }
  15.         else
  16.             QStyledItemDelegate::paint(painter, option, index);
  17.     }
  18.  
  19.     QString displayText(const QVariant & value, const QLocale & locale ) const
  20.     {
  21.         Q_UNUSED(locale);
  22.         qDebug() << "Delegate called with " << value;
  23.         return QString("{%1,%2}").arg(value.toPoint().x()).arg(value.toPoint().y());
  24.     }
  25. };
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