A hacky way of setting a custom delegate for QListView

main.cpp

#include <QtWidgets>
#include <QDebug>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QMainWindow mainWindow;

    QWidget *centralWidget = new QWidget;
    mainWindow.setCentralWidget(centralWidget);

    QVBoxLayout *vBoxLayout = new QVBoxLayout(centralWidget);

    auto listView = new QListView(centralWidget);
    QStandardItemModel model(100, 1);
    for (int row = 0; row < model.rowCount(); ++row) {
        QStandardItem *item = new QStandardItem(QString("row %0").arg(row));
        model.setItem(row, 0, item);
    }
    listView->setModel(&model);

    // This makes the widget always visible, whereas the custom delegate
    // approach doesn't, and manages memory better as a result.
    // To do it properly, subclass QStyledItemDelegate and reimplement createEditor():
    // https://doc.qt.io/qt-5/qtwidgets-itemviews-stardelegate-example.html
    for (int row = 0; row < 10; ++row) {
        auto slider = new QSlider;
        slider->setOrientation(Qt::Horizontal);
        listView->setIndexWidget(model.index(row, 0), slider);
    }

    vBoxLayout->addWidget(listView);

    mainWindow.centralWidget()->setLayout(vBoxLayout);
    mainWindow.resize(400, 400);
    mainWindow.show();

    return app.exec();
}