I'm having some problem in realizing an interaction between QML and C++ to obtain a very basic file browser that is shown within a ListView. I tried to use as model for my data the QT class QFileSystemModel, but it did't work as I expected, probably I didn't fully understand the QT class documentation about the use of this model or the example I found on the internet.

Here is the code that I am using:

File main.cpp

#include <QModelIndex>
#include <QFileSystemModel>
#include <QQmlContext>
#include <QApplication>
#include "qtquick2applicationviewer.h"


int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QFileSystemModel* model = new QFileSystemModel;
    model->setRootPath("C:/");
    model->setFilter(QDir::Files | QDir::AllDirs);
    QtQuick2ApplicationViewer viewer;

    // Make QFileSystemModel* available for QML use.

    viewer.rootContext()->setContextProperty("myFileModel", model);
    viewer.setMainQmlFile(QStringLiteral("qml/ProvaQML/main.qml"));
    viewer.showExpanded();
    return app.exec();
}

File main.qml

Rectangle
{
    id: main
    width: 800
    height: 600

    ListView
    {
        id: view
        property string root_path: "C:/Users"
        x: 40
        y: 20
        width: parent.width - (2*x)
        height: parent.height - (2*y)

        VisualDataModel
        {
            id: myVisualModel
            model: myFileModel      // Get the model QFileSystemModel exposed from C++
            delegate
            {
                Rectangle
                {
                    width: 210; height: 20;
                    radius: 5; border.width: 2; border.color: "orange"; color: "yellow";
                    Text { text: fileName; x: parent.x + 10; }
                    MouseArea
                    {
                        anchors.fill: parent
                        onDoubleClicked:
                        {
                            myVisualModel.rootIndex = myVisualModel.modelIndex(index)
                        }
                    }
                }
            }
        }

        highlight: Rectangle { color: "lightsteelblue"; radius: 5 }
        focus: true
    }

}

The first problem with this code is that first elements that I can see within my list are my PC logical drives even if I set a specific path. Then when I first double click on drive "C:\" it shows the list of files and directories on that path, but when I double click on a directory a second time the screen flickers for one moment and then it shows again the PC logical drives. Can anyone tell me how should I use the QFileSystemModel class with a ListView QML object?

Thanks in advance!

Carlo