Adding a header to a QListView - c++11

Question

I encountered a little problem with QListView. I wanted to add a header to this object. However, I found no method to do such a task. I have seen several posts on SO and Qt forums but did not found anything relevant to my needs. I remembered that, in the past, I have used something that could be adapted to QListView (I think it was inspired by a Qt example but do not remember which one).
For those who need to display a header on the top of the QListView, I will post the code here. If someone find something false, or unadapted, please let me know. Here is the code:
Header
class MainMenuListView : public QListView
{
Q_OBJECT
class Header : public QWidget
{
public:
Header(MainMenuListView* parent);
QSize sizeHint() const;
protected:
void paintEvent(QPaintEvent* event);
private:
MainMenuListView* menu;
};
public:
MainMenuListView(QWidget* parent = nullptr, const QString& header = QString("Header"));
void headerAreaPaintEvent(QPaintEvent *event);
int headerAreaWidth();
protected:
void resizeEvent(QResizeEvent* event);
private:
QWidget* headerArea;
QString headerText;
};
Implementation
MainMenuListView::Header::Header(MainMenuListView* parent) : QWidget(parent), menu(parent) {}
QSize MainMenuListView::Header::sizeHint() const
{
return QSize(menu->headerAreaWidth(), fontMetrics().height());
}
void MainMenuListView::Header::paintEvent(QPaintEvent* event)
{
menu->headerAreaPaintEvent(event);
}
MainMenuListView::MainMenuListView(QWidget* parent, const QString& header) : QListView(parent), headerText(header)
{
headerArea = new Header(this);
setViewportMargins(0, fontMetrics().height(), 0, 0);
}
void MainMenuListView::headerAreaPaintEvent(QPaintEvent* event)
{
QPainter painter(headerArea);
painter.fillRect(event->rect(), Qt::lightGray);
painter.setPen(Qt::black);
painter.drawText(0, 0, headerArea->width(), fontMetrics().height(), Qt::AlignCenter, headerText);
}
int MainMenuListView::headerAreaWidth()
{
return width();
}
void MainMenuListView::resizeEvent(QResizeEvent* event)
{
QListView::resizeEvent(event);
headerArea->adjustSize();
}
Tested and working under Debian Qt5.x.x
Result: