insertColumn method

void insertColumn(int columnIndex)

Inserts an empty column in sheet at position = columnIndex.

If columnIndex == null or columnIndex < 0 if will not execute

If the sheet does not exists then it will be created automatically.

Implementation

void insertColumn(int columnIndex) {
  if (columnIndex < 0) {
    return;
  }
  _checkMaxColumn(columnIndex);

  bool updateSpanCell = false;

  _spannedItems = FastList<String>();
  for (int i = 0; i < _spanList.length; i++) {
    _Span? spanObj = _spanList[i];
    if (spanObj == null) {
      continue;
    }
    int startColumn = spanObj.columnSpanStart,
        startRow = spanObj.rowSpanStart,
        endColumn = spanObj.columnSpanEnd,
        endRow = spanObj.rowSpanEnd;

    if (columnIndex <= endColumn) {
      if (columnIndex <= startColumn) {
        startColumn += 1;
      }
      endColumn += 1;
      _Span newSpanObj = _Span(
        rowSpanStart: startRow,
        columnSpanStart: startColumn,
        rowSpanEnd: endRow,
        columnSpanEnd: endColumn,
      );
      _spanList[i] = newSpanObj;
      updateSpanCell = true;
      _excel._mergeChanges = true;
    }
    String rc = getSpanCellId(startColumn, startRow, endColumn, endRow);
    if (!_spannedItems.contains(rc)) {
      _spannedItems.add(rc);
    }
  }

  if (updateSpanCell) {
    _excel._mergeChangeLookup = sheetName;
  }

  if (_sheetData.isNotEmpty) {
    final Map<int, Map<int, Data>> _data = Map<int, Map<int, Data>>();
    final List<int> sortedKeys = _sheetData.keys.toList()..sort();
    if (columnIndex <= maxColumns - 1) {
      /// do the shifting task
      sortedKeys.forEach((rowKey) {
        final Map<int, Data> columnMap = Map<int, Data>();

        /// getting the column keys in descending order so as to shifting becomes easy
        final List<int> sortedColumnKeys = _sheetData[rowKey]!.keys.toList()
          ..sort((a, b) {
            return b.compareTo(a);
          });
        sortedColumnKeys.forEach((columnKey) {
          if (_sheetData[rowKey] != null &&
              _sheetData[rowKey]![columnKey] != null) {
            if (columnKey < columnIndex) {
              columnMap[columnKey] = _sheetData[rowKey]![columnKey]!;
            }
            if (columnIndex <= columnKey) {
              columnMap[columnKey + 1] = _sheetData[rowKey]![columnKey]!;
            }
          }
        });
        columnMap[columnIndex] = Data.newData(this, rowKey, columnIndex);
        _data[rowKey] = Map<int, Data>.from(columnMap);
      });
      _sheetData = Map<int, Map<int, Data>>.from(_data);
    } else {
      /// just put the data in the very first available row and
      /// in the desired Column index only one time as we will be using less space on internal implementatoin
      /// and mock the user as if the 2-D list is being saved
      ///
      /// As when user calls DataObject.cells then we will output 2-D list - pretending.
      _sheetData[sortedKeys.first]![columnIndex] =
          Data.newData(this, sortedKeys.first, columnIndex);
    }
  } else {
    /// here simply just take the first row and put the columnIndex as the _sheetData was previously null
    _sheetData = Map<int, Map<int, Data>>();
    _sheetData[0] = {columnIndex: Data.newData(this, 0, columnIndex)};
  }
  if (_maxColumns - 1 <= columnIndex) {
    _maxColumns += 1;
  } else {
    _maxColumns = columnIndex + 1;
  }

  //_countRowsAndColumns();
}