apply<T extends DataGridRow> method

@override DataGridState<T>? apply<T extends DataGridRow>(EventContext<T> context)

Apply this event's transformation to the state. Returns the new state, or null if no state change should occur. Can return a Future for async operations.

Implementation

@override
DataGridState<T>? apply<T extends DataGridRow>(EventContext<T> context) {
  if (context.state.selection.mode == SelectionMode.none) {
    return null;
  }

  final selectedRows = Set<double>.from(
    context.state.selection.selectedRowIds,
  );

  final startIdx = context.state.displayOrder.indexOf(startRowId);
  final endIdx = context.state.displayOrder.indexOf(endRowId);

  if (startIdx == -1 || endIdx == -1) {
    return null;
  }

  final minIdx = startIdx < endIdx ? startIdx : endIdx;
  final maxIdx = startIdx < endIdx ? endIdx : startIdx;

  final rangeIds = context.state.displayOrder.sublist(minIdx, maxIdx + 1);
  selectedRows.addAll(rangeIds);

  return context.state.copyWith(
    selection: context.state.selection.copyWith(selectedRowIds: selectedRows),
  );
}