CODEWITHSUNDEEP
c++qtqml
Łukasz Przeniosło
Łukasz Przeniosło

Reputation: 2949

QAbstractTableModel::header data and QML TableView

I have subclasses the QAbstractTableModel and provided the headerData override:

/**
 * @brief   Obtains the header (columns) names.
 * @param   section: column number.
 * @param   orientation: Accepts only horizontal.
 * @param   role: Accepts only display.
 * @return  The column header text in case all params are valid.
 *          Otherwise empty QVariant.
 */
QVariant CVarTableModel::headerData(int section,
                                    Qt::Orientation orientation,
                                    int role) const
{
    if (role != Qt::DisplayRole)
        return QVariant();

    if (orientation != Qt::Horizontal)
        return QVariant();

    if (section >= static_cast<int>(Columns::ZCOUNT))
        return QVariant();

    return QVariant::fromValue(static_cast<Columns>(section));
}

I am trying to figure out how to make my QML TableView component utilize this function. Is there a way to do this automatically?

Upvotes: 1

Views: 1933

Answers (2)

Marschos
Marschos

Reputation: 33

I found today a different solution to this I did not know: https://doc.qt.io/qt-6/qml-qtquick-controls2-horizontalheaderview.html

Column{
    HorizontalHeaderView{
        syncView: tableView
    }
    TableView {
        id: tableView
        model: myModel
    }
}

The HorizontalHeaderView will use what you provide in your model with headerData.

Upvotes: 0

Dimitry Ernot
Dimitry Ernot

Reputation: 6584

Make your method invokbale from QML by using the macro Q_INVOKABLE. Then, use it in your QML as any other method:

class Model: public QStandardItemModel
{
public:
    Model(QObject* parent=nullptr): QStandardItemModel(parent)
    {
        setColumnCount(2);
        setRowCount(2);
    }

    Q_INVOKABLE virtual QVariant headerData(int section,
                                        Qt::Orientation orientation,
                                        int role=Qt::DisplayRole) const override
    {
        qDebug() << section << orientation << role;
        if (role != Qt::DisplayRole)
            return QVariant();

        if (section == 0)
            return "First Column";
        return "Not first column";
    }
};

// In main.cpp
Model* model = new Model();

QQuickView *view = new QQuickView;

view->rootContext()->setContextProperty("myModel", model);

view->setSource(QUrl("qrc:/main.qml"));
view->show();

TableView {
    TableViewColumn {
        role: "title"
        title: myModel.headerData(0, Qt.Vertical);
        width: 100
    }
    TableViewColumn {
        role: "author"
        title: myModel.headerData(1, Qt.Vertical);
        width: 200
    }
    model: myModel
}

Upvotes: 2

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