How to add custom items to QFileDialog?

Question

I am using non-native QFileDialog (for choosing directory path) and I need to add some custom drives. I don't even need to display any content inside of these drives for now, I just need to display these drives on the top level (and preferably with my icon) and output some special string in the result when user selects it.

What is the easiest way to implement this?

I have read in the documentation that proxy model can be used for that, but I don't understand how to implement such model, all examples show only filtering and sorting of the already available items.

Answer 1

If I understand you correctly, you want to add additional drives to the side bar on the left side of the file dialog?

The function you are looking for is QFileDialog::setSidebarUrls

#include <QApplication>
#include <QMainWindow>
#include <QHBoxLayout>
#include <QPushButton>
#include <QFileDialog>

int main(int argc, char** argv)
{
    QApplication app(argc, argv);
    QMainWindow window;

    QWidget widget;
    QHBoxLayout layout(&widget);

    QPushButton open("open");
    layout.addWidget(&open);

    QObject::connect(&open, &QPushButton::clicked, [&]()
        {
            QFileDialog dialog;
            dialog.setOption(QFileDialog::DontUseNativeDialog);

            QList<QUrl> drives;
            drives << QUrl::fromLocalFile(QDir("D:").absolutePath());
            drives << QUrl::fromLocalFile(QDir("E:").absolutePath());
            drives << QUrl::fromLocalFile(QDir("foobar").absolutePath());
            dialog.setSidebarUrls(drives);

            dialog.exec();
        });

    window.setCentralWidget(&widget);
    window.show();
    return app.exec();
}

The result of this is shown below:

If, however, the drives you've added don't exist / aren't accessible, then they will be shown greyed out.