Use delegate to draw different type of items

[nifei]

Hi, all,
I want to use a custom delegate to draw itemView's item, and items with different role-values should have different style, and I wish this style could be configured by QSS. I'v got that QSS cannot config single item from others, so i hope QSS config most of the items in a view, and for some special items( with a special role-value), re-implement QStyledItemDelegate : : paint(...) and draw it. However, I don't know how to change the styleoption parameter of paint(...), and I wondered why the items are drawn according to the style sheet even if i did nothing in the re-implementation of paint(...). Here is my code

CustomDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index)const
{
  // if i did nothing in this function, the items are draw by the view? since they are still draw as the style sheet
  if (index.data(Qt::UserRole).toBool())
{
   QStyledItemDelegate::paint(painter, option, index);
}
  else
{
  QStyleOption another_option(option);
   // here, i wonder how to change the option to change the style of this item, for example, i hope this item has the same border and font as others, but different background-color, however, this does not work:
   another_option.palette.setColor(QPalette::Background, QColor(Qt::yellow));
 
}
}

CustomDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index)const
{
  // if i did nothing in this function, the items are draw by the view? since they are still draw as the style sheet
  if (index.data(Qt::UserRole).toBool())
{
   QStyledItemDelegate::paint(painter, option, index);
}
  else
{
  QStyleOption another_option(option);
   // here, i wonder how to change the option to change the style of this item, for example, i hope this item has the same border and font as others, but different background-color, however, this does not work:
   another_option.palette.setColor(QPalette::Background, QColor(Qt::yellow));
   
}
}

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Thanks in advance for any suggestions and help

[aamer4yu]

For using different style for different items, you can have a look at QStylePainter documentation