QVariant headerData( int section, Qt::Orientation orientation,
int role = Qt::DisplayRole ) const;
int rowCount( const QModelIndex &parent = QModelIndex() ) const;
int columnCount( const QModelIndex &parent = QModelIndex() ) const;
Qt::ItemFlags flags( const QModelIndex &index ) const;
QVariant headerData( int section, Qt::Orientation orientation,
int role = Qt::DisplayRole ) const;
int rowCount( const QModelIndex &parent = QModelIndex() ) const;
int columnCount( const QModelIndex &parent = QModelIndex() ) const;
Qt::ItemFlags flags( const QModelIndex &index ) const;