cell method

Implementation

Data cell(CellIndex cellIndex) {
  _checkMaxColumn(cellIndex.columnIndex);
  _checkMaxRow(cellIndex.rowIndex);
  if (cellIndex.columnIndex < 0 || cellIndex.rowIndex < 0) {
    final negative = cellIndex.columnIndex < 0;
    throw ArgumentError.value(
      negative ? cellIndex.columnIndex : cellIndex.rowIndex,
      negative ? 'columnIndex' : 'rowIndex',
      'must not be negative',
    );
  }

  /// increasing the row count
  if (_maxRows < (cellIndex.rowIndex + 1)) {
    _maxRows = cellIndex.rowIndex + 1;
  }

  /// increasing the column count
  if (_maxColumns < (cellIndex.columnIndex + 1)) {
    _maxColumns = cellIndex.columnIndex + 1;
  }

  var row = _sheetData[cellIndex.rowIndex];
  if (row == null) {
    _sheetData[cellIndex.rowIndex] = row = {};
  }
  return row[cellIndex.columnIndex] ??= Data.newData(
    this as Sheet,
    cellIndex.rowIndex,
    cellIndex.columnIndex,
  );
}