Paint selection in QStyledItemDelegate's subclass

[woodtluk]

Hi there

For a list in my application I use a delegate that is derived from QStyledItemDelegate. In the paint method I'd like to handle the selection of the items in the list.

Now I'm doing it like this:

void MembersListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
  if(!index.isValid())
    return;
 
  painter->save();
  painter->setRenderHint(QPainter::Antialiasing);
 
  QStyleOptionViewItemV4 opt = option;
  QStyledItemDelegate::initStyleOption(&opt, index);
  QRect rect = opt.rect;
 
  // handle selection
  if(option.state & QStyle::State_Selected){
    painter->save();
 
    QBrush selectionBrush(Qt::green);
    painter->setBrush(selectionBrush);
    painter->drawRoundedRect(rect.adjusted(1,1,-1,-1), 5, 5);
 
    painter->restore();
   }
 
// ...
   painter->restore();
}

void MembersListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
  if(!index.isValid())
    return;

  painter->save();
  painter->setRenderHint(QPainter::Antialiasing);

  QStyleOptionViewItemV4 opt = option;
  QStyledItemDelegate::initStyleOption(&opt, index);
  QRect rect = opt.rect;

  // handle selection
  if(option.state & QStyle::State_Selected){
    painter->save();

    QBrush selectionBrush(Qt::green);
    painter->setBrush(selectionBrush);
    painter->drawRoundedRect(rect.adjusted(1,1,-1,-1), 5, 5);

    painter->restore();
   }

// ...
   painter->restore();
}

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But the selection doesn't look exactly the same as the default one which is used when no delegate is set. How can I use the standard selection in my delegate.

Btw: I'm using Qt on Symbian (Nokia N8) where the background of the list has black color and the selection is a green rounded rect with some kind of gradient.

Thanks!

[woodtluk]

I figured it out:

In the paint function of my delegate I first call the paint function of the QStyledItemDelegate.
And then I just don't paint any selection myself anymore.

void MembersListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
  if(!index.isValid())
    return;
 
  QStyledItemDelegate::paint(painter, option, index);
 
  painter->save();
  painter->setRenderHint(QPainter::Antialiasing);
 
  QStyleOptionViewItemV4 opt = option;
  QStyledItemDelegate::initStyleOption(&opt, index);
  QRect rect = opt.rect;
 
// ... All my custom painting stuff here
 
 
   painter->restore();
}

void MembersListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
  if(!index.isValid())
    return;

  QStyledItemDelegate::paint(painter, option, index);

  painter->save();
  painter->setRenderHint(QPainter::Antialiasing);

  QStyleOptionViewItemV4 opt = option;
  QStyledItemDelegate::initStyleOption(&opt, index);
  QRect rect = opt.rect;

// ... All my custom painting stuff here


   painter->restore();
}

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Cheers Luke

[vaychick]

I have solved my problem by setting mouseTracking option in my QTableView.
P.S. Sorry for my english.