flutter config --enable-<platform>-desktop

 MoYuBloc() : super(MoyuInit()) {
    on(_handleMoyuStart);
    on(_handleUpdateProgress);
    on(_handleMoyuEnd);
  }

// handle moyu start action
  FutureOr<void> _handleMoyuStart(
      MoyuStarted event, Emitter<MoyuState> emit) async {
    if (_timer != null && _timer!.isActive) {
      _timer?.cancel();
    }
 
    final totalTime = event.time;
    int progressTime = state is MoyuIng ? (state as MoyuIng).progressTime : 0;
 
    _timer = Timer.periodic(const Duration(seconds: 1), (timer) {
      add(MoyuProgressUpdated(totalTime, ++progressTime));
 
      if (progressTime >= totalTime) {
        timer.cancel();
        add(MoyuEnded());
      }
    });
    emit(MoyuIng(progress: 0, progressTime: 0));
  }

// handle clock update
  FutureOr<void> _handleUpdateProgress(
      MoyuProgressUpdated event, Emitter<MoyuState> emit) async {
    final totalTime = event.totalTime;
    final progressTime = event.progressTime;
    emit(
      MoyuIng(progress: progressTime / totalTime, progressTime: progressTime),
    );
  }

// handle clock end
  FutureOr<void> _handleMoyuEnd(
      MoyuEnded event, Emitter<MoyuState> emit) async {
    emit(MoyuFinish());
  }

abstract class MoyuEvent {}
 
class MoyuStarted extends MoyuEvent {
  final int time;
  final System os;
 
  MoyuStarted({required this.time, required this.os});
}
 
class MoyuProgressUpdated extends MoyuEvent {
  final int totalTime;
  final int progressTime;
 
  MoyuProgressUpdated(this.totalTime, this.progressTime);
}
 
class MoyuEnded extends MoyuEvent {
  MoyuEnded();
}

abstract class MoyuState {}
 
class MoyuInit extends MoyuState {}
 
class MoyuIng extends MoyuState {
  final double progress;
  final int progressTime;
 
  MoyuIng({required this.progress, required this.progressTime});
}
 
class MoyuFinish extends MoyuState {}

BlocConsumer<MoYuBloc, MoyuState>(
          builder: (context, state) {
            if (state is MoyuIng) {
              final progress = state.progress;
 
              return _moyuIngView(progress);
            } else if (state is MoyuFinish) {
              return _replayView();
            }
            return const SizedBox();
          },
          listener: (context, state) {},
          listenWhen: (pre, cur) => pre != cur,
        ),

flutter run -d macos