enum SortBy {SortByTitle, SortByAuthor};
explicit SortedLibrary(QObject *parent = 0);
bool lessThan(const QModelIndex &left, const QModelIndex &right) const;
enum SortBy {SortByTitle, SortByAuthor};
explicit SortedLibrary(QObject *parent = 0);
bool lessThan(const QModelIndex &left, const QModelIndex &right) const;