Flutter BLoC -如何将参数传递给事件？

class CustomEvent extends Equatable {
  final String parameter;

  const CustomEvent(this.parameter);

  @override
  List<Object> get props => [parameter];
}

class CustomBloc extends Bloc<CustomEvent, CustomState> {
  CustomBloc() : super(InitialCustomState());

  @override
  Stream<CustomState> mapEventToState(CustomEvent event) async* {
    // 访问事件的参数
    final parameter = event.parameter;

    // 根据参数进行相应的处理
    // ...

    // 触发状态的变化
    yield UpdatedCustomState();
  }
}

class MyWidget extends StatelessWidget {
  final CustomBloc customBloc;

  MyWidget(this.customBloc);

  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      onPressed: () {
        // 创建带有参数的事件实例
        final event = CustomEvent('参数值');

        // 将事件添加到BLoC中
        customBloc.add(event);
      },
      child: Text('触发事件'),
    );
  }
}