QFileDialog that accepts a single file or a single directory

Question

Is it possible to show a QFileDialog where the user can select a file or a directory, either one?

QFileDialog::getOpenFileName() accepts only files, while

Answer 1

What worked for me was to use:

file_dialog.setProxyModel(nullptr);

as suggested here, or

class FileFilterProxyModel : public QSortFilterProxyModel
{
protected:
    virtual bool filterAcceptsRow(int sourceRow, const QModelIndex& sourceParent) const
    {
        QFileSystemModel* fileModel = qobject_cast(sourceModel());
        return (fileModel!=NULL && fileModel->isDir(sourceModel()->index(sourceRow, 0, sourceParent))) || QSortFilterProxyModel::filterAcceptsRow(sourceRow, sourceParent);
    }
};
...
FileFilterProxyModel* proxyModel = new FileFilterProxyModel;
file_dialog.setProxyModel(proxyModel);

as suggested here, or

class FileDialog : public QFileDialog
{
    Q_OBJECT
public:
    explicit FileDialog(QWidget *parent = Q_NULLPTR)
        : QFileDialog(parent)
    {
        m_btnOpen = NULL;
        m_listView = NULL;
        m_treeView = NULL;
        m_selectedFiles.clear();

        this->setOption(QFileDialog::DontUseNativeDialog, true);
        this->setFileMode(QFileDialog::Directory);
        QList btns = this->findChildren();
        for (int i = 0; i < btns.size(); ++i) {
            QString text = btns[i]->text();
            if (text.toLower().contains("open") || text.toLower().contains("choose"))
            {
                m_btnOpen = btns[i];
                break;
            }
        }

        if (!m_btnOpen) return;

        m_btnOpen->installEventFilter(this);
        //connect(m_btnOpen, SIGNAL(changed()), this, SLOT(btnChanged()))
        m_btnOpen->disconnect(SIGNAL(clicked()));
        connect(m_btnOpen, SIGNAL(clicked()), this, SLOT(chooseClicked()));


        m_listView = findChild("listView");
        if (m_listView)
            m_listView->setSelectionMode(QAbstractItemView::ExtendedSelection);

        m_treeView = findChild();
        if (m_treeView)
            m_treeView->setSelectionMode(QAbstractItemView::ExtendedSelection);
    }

    QStringList selectedFiles()
    {
        return m_selectedFiles;
    }

    bool eventFilter( QObject* watched, QEvent* event )
    {
        QPushButton *btn = qobject_cast(watched);
        if (btn)
        {
            if(event->type()==QEvent::EnabledChange) {
                if (!btn->isEnabled())
                    btn->setEnabled(true);
            }
        }

        return QWidget::eventFilter(watched, event);
    }

public slots:
    void chooseClicked()
    {
        QModelIndexList indexList = m_listView->selectionModel()->selectedIndexes();
        foreach (QModelIndex index, indexList)
        {
            if (index.column()== 0)
                m_selectedFiles.append(this->directory().absolutePath() + "/" + index.data().toString());
        }
        QDialog::accept();
    }

private:
    QListView *m_listView;
    QTreeView *m_treeView;
    QPushButton *m_btnOpen;
    QStringList m_selectedFiles;
};

as suggested here. Credits for the original authors and me.