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) {
  final expandedGroups = Map<String, bool>.from(
    context.state.group.expandedGroups,
  );

  if (expandedGroups.containsKey(groupKey)) {
    expandedGroups[groupKey] = !expandedGroups[groupKey]!;
  } else {
    expandedGroups[groupKey] = true;
  }

  return context.state.copyWith(
    group: context.state.group.copyWith(expandedGroups: expandedGroups),
  );
}