QTreeWidget 填充Indictor指示器背景色

void TreeWidget::drawRow(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
	QStyleOptionViewItemV3 opt = option;
	if (index.parent() == QModelIndex())
	{
		const QColor c = option.palette.color(QPalette::Dark);
		painter->fillRect(option.rect, c);
		opt.palette.setColor(QPalette::AlternateBase, c);
	}
	QTreeWidget::drawRow(painter, opt, index);
	QColor color = static_cast(QApplication::style()->styleHint(QStyle::SH_Table_GridLineColor, &opt));
	painter->save();
	painter->setPen(QPen(color));
	painter->drawLine(opt.rect.x(), opt.rect.bottom(), opt.rect.right(), opt.rect.bottom());
	painter->restore();
}

效果如下：