C++ (Qt)
//............
painter->translate(opt.rect.left(), opt.rect.top());
QRect clip(0, 0, opt.rect.width(), opt.rect.height());
 
lbl.render(painter, QPoint(5,5), QRegion(QRect(clip)), QWidget::DrawChildren); // QPoint(5,5)
//.........
 

C++ (Qt)
lbl.render(painter, QPoint(5,opt.rect.height()/2 - 7), QRegion(QRect(clip)), QWidget::DrawChildren);
 

C++ (Qt)
//............
painter->translate(opt.rect.left(), opt.rect.top());
QRect clip(0, 0, opt.rect.width(), opt.rect.height());
 
lbl.render(painter, QPoint(5,5), QRegion(QRect(clip)), QWidget::DrawChildren); // QPoint(5,5)
//.........
 

C++ (Qt)
#ifndef HTMLDELEGATE_H
#define HTMLDELEGATE_H
 
#include <QStyledItemDelegate>
 
class HtmlDelegate : public QStyledItemDelegate
{
    Q_OBJECT
 
public:
    HtmlDelegate(QObject *parent = 0);
 
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
};
 
#endif
 

C++ (Qt)
#include <QtWidgets>
#include "htmldelegate.h"
 
HtmlDelegate::HtmlDelegate(QObject *parent)
    : QStyledItemDelegate(parent)
{
}
 
void HtmlDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
    QStyleOptionViewItem opt = option;
    initStyleOption(&opt, index);
 
    painter->save();
 
    QLabel doc(opt.text);
 
    doc.setText(opt.text);
 
    opt.text = "";
    opt.widget->style()->drawControl(QStyle::CE_ItemViewItem, &option, painter);
 
    painter->translate(opt.rect.left(), opt.rect.top());
    QRect clip(0, 0, opt.rect.width(), opt.rect.height());
 
    doc.render(painter, QPoint(0,0), QRegion(QRect(clip)), QWidget::DrawChildren); // !!!!!
 
    painter->restore();
}
 

C++ (Qt)
#include "htmldelegate.h"
#include <QApplication>
#include <QtWidgets>
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    QStringListModel model;
    QTableView tableView;
 
    QStringList lst;
 
    lst << "<b>First</b> html text"
        << "Se<font color=red>con</font>d html <i>text</i>";
 
    model.setStringList(lst);
    tableView.setModel(&model);
 
    HtmlDelegate delegate;
    tableView.setItemDelegate(&delegate);
    tableView.setEditTriggers(QAbstractItemView::NoEditTriggers);
 
    tableView.setWindowTitle("Html delegate");
    tableView.show();
    tableView.resizeColumnsToContents();
 
    return app.exec();
}