performGrouping method

@protected String performGrouping(String columnName, DataGridRow row)

Called when grouping is applied to the SfDataGrid.groupedColumns.

Overriding this method provides complete control over grouping. It is invoked when each row is being grouped based on a key. Custom grouping can be achieved by returning a key for the rows.

Implementation

@protected
String performGrouping(String columnName, DataGridRow row) {
  return row
          .getCells()
          .firstWhereOrNull(
              (DataGridCell cell) => cell.columnName == columnName)
          ?.value
          ?.toString() ??
      '';
}