跨集团共享状态

Question

在我的项目中，我正在使用flutter_bloc库。

我有很多屏幕，对于每个屏幕，我正在使用ScreenBloc<ScreenEvent, ScreenState>，效果很好。

但是，我发现自己在这些集团之间复制了状态类，例如Init Loading，Error，Loaded ShowBottomSheet等。

是否存在一种优雅的方式或模式来拥有一些基本国家，以便所有集团都能共享或扩展？

请考虑以下示例：

 //For screen A I define the following: 
 class ScreenAEvent extends Equatable{}
 //Screen A events..
 
//Screen A states..
 class ScreenAState extends Equatable{}
 class Init extends ScreenAState{}
 class Loading extends ScreenAState{}
 class Error extends ScreenAState{
      final Exception e;
      Error(this.e)
 }
 class ShowBottomSheet extends ScreenAState{} //Using BlocListener to show bottom sheet
 class BlocScreenA extends Bloc<ScreenAEvent, ScreenAState>{
  //Code for screen A bloc
 }

 //For screen B I define the following: 
 class ScreenBEvent extends Equatable{}
 //Screen B events..
 
 //Screen B states
 class ScreenBState extends Equatable{}
 class Init extends ScreenBState{} //Defining again Init
 class Loading extends ScreenBState{} //Defining again Loading
 class Error extends ScreenBState{  //Same for error
      final Exception e;
      Error(this.e)
 }
 class ShowBottomSheet extends ScreenBState{} 
 class BlocScreenB extends Bloc<ScreenBEvent, ScreenBState>{
  //Code for screen B bloc
 }

 For each screen in the app, I have at least the Init, Loading, Error and Loaded states.. 
How can these implemented with the flutter_bloc library?