onChange method

@override void onChange(BlocBase bloc, Change change)

Called whenever a Change occurs in any bloc A change occurs when a new state is emitted. onChange is called before a bloc's state has been updated.

Implementation

@override
void onChange(BlocBase<dynamic> bloc, Change<dynamic> change) {
  super.onChange(bloc, change);
  assert(() {
    final context = CausalityZone.currentContext();
    TrinityEventBus.instance.emit(CausalEvent(
      parentId: context?.eventId,
      type: CausalEventType.stateChange,
      description: '${bloc.runtimeType}: state changed',
      metadata: {
        'bloc_type': bloc.runtimeType.toString(),
        'current_state_type': change.currentState.runtimeType.toString(),
        'next_state_type': change.nextState.runtimeType.toString(),
      },
    ));
    return true;
  }());
}