How to freeze TableView header row?

[adqt]

I am new to Qt. I have a TableView with header row that does not freeze when I scroll. Basically, I want column titles to stay on top in the visible area. I also have another issue related to scrollbars I will create another topic for that. Here is my TableView code:

    TableView{
        id: tableViewOutput
        anchors.fill: parent
        columnSpacing: 1
        rowSpacing: 1
        clip: true

        model: DatagridTableModel {}
        delegate: Rectangle {
            border.color: "black"
            implicitHeight: datacell.implicitHeight+10
            implicitWidth: datacell.implicitWidth+30
            border.width: 1
            Rectangle {
                anchors.fill: parent
                anchors.bottomMargin: 1
                anchors.rightMargin: 1
                color: heading ? '#757575':"#EEEEEE"
                Text {
                    id: datacell
                    text: tabledata
                    wrapMode: Text.Normal
                    anchors.fill: parent
                    anchors.margins: 10
                    color: heading ? 'white':"black"
                    font.pixelSize: 10
                    verticalAlignment: Text.AlignVCenter
                }
            }
        }
    }//TableView

Model class header file is as follows:

class DatagridTableModel: public QAbstractTableModel
{

    Q_OBJECT
    enum TableRoles { TableDataRole = Qt::UserRole + 1, HeadingRole };

public:
    DatagridTableModel();



    // QAbstractItemModel interface
public:
    int rowCount(const QModelIndex &parent) const;
    int columnCount(const QModelIndex &parent) const;
    QVariant data(const QModelIndex &index, int role) const;
    bool setData(const QModelIndex &index, const QVariant &value, int role);
    QVariant headerData(int section, Qt::Orientation orientation, int role) const;
    bool insertRows(int row, int count, const QModelIndex &parent);
    bool removeRows(int row, int count, const QModelIndex &parent);
    Qt::ItemFlags flags(const QModelIndex &index) const;
    QHash<int, QByteArray> roleNames() const;

private:
    QVector<QVector<QVariant>> table;
};

headers do not stay as I scroll