foldermodel.h

#include <QSortFilterProxyModel>
#include <QDir>

class QFileSystemModel;
class QFileIconProvider;

class FolderModel : public QSortFilterProxyModel
{
public:
    explicit FolderModel(QObject *parent = Q_NULLPTR);
    ~FolderModel();

    using QSortFilterProxyModel::index;
    QModelIndex index(const QString &path, int column = 0) const;

    void setDotFirst(bool enable);
    bool dotFirst();

    void sort(int column, Qt::SortOrder order = Qt::AscendingOrder) Q_DECL_OVERRIDE;

    // QFileSystemModel specific API
    QModelIndex setRootPath(const QString &path);
    QString filePath(const QModelIndex &index) const;
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private:
    bool lessThan(const QModelIndex &source_left, const QModelIndex &source_right) const Q_DECL_OVERRIDE;

    QFileSystemModel* fsModel_;
    bool dotFirst_;
};