deleteColumn method

void deleteColumn(int columnIndex, [ int? columnCount ])

Delete the Column in the Worksheet.

// Create a new Excel Document.
final Workbook workbook = Workbook();
// Accessing sheet via index.
final Worksheet sheet = workbook.worksheets[0];
Range range = sheet.getRangeByName('A2');
range.setText('Hello');
range = sheet.getRangeByName('C2');
range.setText('World');

// Delete a column.
sheet.deleteColumn(2, 1);

// Save and dispose workbook.
final List<int> bytes = workbook.saveAsStream();
File('DeleteRowandColumn.xlsx').writeAsBytes(bytes);
workbook.dispose();

Implementation

void deleteColumn(int columnIndex, [int? columnCount]) {
  if (columnIndex < 1 || columnIndex > workbook._maxColumnCount) {
    throw Exception(
        'Value cannot be less 1 and greater than max column index.');
  }
  columnCount ??= 1;
  if (columnCount < 0) {
    throw Exception('count');
  }
  final int firstRow = getFirstRow();
  final int lastRow = getLastRow();
  final int lastColumn = getLastColumn();
  for (int i = firstRow; i <= lastRow; i++) {
    if (rows[i] != null) {
      for (int count = 1; count <= columnCount; count++) {
        for (int j = columnIndex; j <= lastColumn; j++) {
          final Range? range = rows[i]!.ranges[j];
          if (range != null &&
              j != lastColumn &&
              rows[i]!.ranges[j + 1] != null) {
            rows[i]!.ranges[j] = rows[i]!.ranges[j + 1];
            rows[i]!.ranges[j]!._index = rows[i]!.ranges[j]!._index - 1;
            rows[i]!.ranges[j]!.row = rows[i]!.ranges[j]!.row;
            rows[i]!.ranges[j]!.lastRow = rows[i]!.ranges[j]!.lastRow;
            rows[i]!.ranges[j]!.column = rows[i]!.ranges[j]!.column - 1;
            rows[i]!.ranges[j]!.lastColumn =
                rows[i]!.ranges[j]!.lastColumn - 1;
          } else if (range == null &&
              j != lastColumn &&
              rows[i]!.ranges[j + 1] != null) {
            rows[i]!.ranges[j] = Range(this);
            rows[i]!.ranges[j] = rows[i]!.ranges[j + 1];
            rows[i]!.ranges[j]!._index = rows[i]!.ranges[j]!._index - 1;
            rows[i]!.ranges[j]!.row = rows[i]!.ranges[j]!.row;
            rows[i]!.ranges[j]!.lastRow = rows[i]!.ranges[j]!.lastRow;
            rows[i]!.ranges[j]!.column = rows[i]!.ranges[j]!.column - 1;
            rows[i]!.ranges[j]!.lastColumn =
                rows[i]!.ranges[j]!.lastColumn - 1;
          } else if (j == lastColumn &&
              rows[i]!.ranges[j] == rows[i]!.ranges[lastColumn]) {
            rows[i]!.ranges[j] = null;
          } else {
            rows[i]!.ranges[j] = rows[i]!.ranges[j + 1];
          }
        }
      }
    }
  }
  for (int count = 1; count <= columnCount; count++) {
    for (int j = columnIndex; j <= lastColumn + columnCount; j++) {
      if (columns[j] == null && columns[j + 1] == null) {
        columns[j + 1] = Column(this);
        columns[j + 1]!.index = j + 1;
        columns[j] = Column(this);
        columns[j]!.index = j;
      }
      if (columns[j] == null && columns[j + 1] != null) {
        columns[j] = Column(this);
        columns[j]!.index = j;
        columns[j]!.width = columns[j + 1]!.width;
      }
      if (columns[j] != null && columns[j + 1] == null) {
        columns[j + 1] = Column(this);
        columns[j + 1]!.index = j + 1;
        columns[j]!.width = columns[j + 1]!.width;
      } else {
        columns[j]!.width = columns[j + 1]!.width;
      }
    }
  }
}