Let others who come here with similar issue judge that...
Well it is because he don't want to write the delegate for you and one annoying thing is when people requesting code but didn't provide what they have tried so far. This leads to the conclusion - which my not be valid in every case - that nothing has be done so far... So I can understand him. And the attitude you are showing is not helpful either. (Beside, if someone has more than 28.000 posts and more then 4.000 thanks, which is the most here, he probably is a nice guy. In this case, I can confirm that)

As to your problem: Have you seen the Star delegate Example? From there:
Qt Code: 
  1. void StarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
  2.                           const QModelIndex &index) const
  3.  {
  4.      if (qVariantCanConvert<StarRating>(index.data())) {
  5.          StarRating starRating = qVariantValue<StarRating>(index.data());
  6.  
  7.          if (option.state & QStyle::State_Selected)
  8.              painter->fillRect(option.rect, option.palette.highlight());
  9.  
  10.          starRating.paint(painter, option.rect, option.palette,
  11.                           StarRating::ReadOnly);
  12.      } else {
  13.          QStyledItemDelegate::paint(painter, option, index);
  14.      }
  15.  }
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Which total represent your example link of a music player.