Correct highlighting with qt custom delegates - c++

Question

I am making a table control that displays some additional text data apart from those in DisplayRole of its model. In all other respects text and cell display should be identical. What i am having trouble with is correct display of highlighted cell.
I am currently using the following code:
void MatchDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
if (option.state & QStyle::State_Selected)
painter->fillRect(option.rect, option.palette.highlight());
painter->save();
QString str = qvariant_cast<QString>(index.data())+ "\n";
str += QString::number(qvariant_cast<float>(index.data(Qt::UserRole)));
if (option.state & QStyle::State_Selected)
painter->setBrush(option.palette.highlightedText());
else
painter->setBrush(qvariant_cast<QBrush>(index.data(Qt::ForegroundRole)));
painter->drawText(option.rect, qvariant_cast<int>(index.data(Qt::TextAlignmentRole)), str);
painter->restore();
}
However, the result looks like this:
Text color is wrong, there is no dashing line around the cell, and when the control loses focus, the cell remains blue instead of becoming light gray like drawn by default cells do.
How should painting code be changed to fix those issues?

Answer 1

Please try below code, It will work.
Set drawControl with take care to draw dashed line( Let Qt take care it internally ) when selected.
Fixed( Dashed line, Text color and multiline ) while selecting cell.
void MatchDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
QStyleOptionViewItemV4 opt = option;
initStyleOption(&opt, index);
const QWidget *widget = option.widget;
QString str = qvariant_cast<QString>(index.data())+ "\n";
str += QString::number(qvariant_cast<float>(index.data(Qt::UserRole)));
opt.text = "";
//option
QStyle *style = widget ? widget->style() : QApplication::style();
if (option.state & QStyle::State_Selected)
{
// Whitee pen while selection
painter->setPen(Qt::white);
painter->setBrush(option.palette.highlightedText());
// This call will take care to draw, dashed line while selecting
style->drawControl(QStyle::CE_ItemViewItem, &opt, painter, widget);
}
else
{
painter->setPen(QPen(option.palette.foreground(), 0));
painter->setBrush(qvariant_cast<QBrush>(index.data(Qt::ForegroundRole)));
}
painter->drawText(option.rect, qvariant_cast<int>(index.data(Qt::TextAlignmentRole)), str);
}