///
idx_type getCellBelow(idx_type cell) const;
///
- idx_type getLastCellAbove(idx_type cell) const;
- ///
- idx_type getLastCellBelow(idx_type cell) const;
- ///
idx_type cellIndex(row_type row, col_type column) const;
///
void setUsebox(idx_type cell, BoxType);