counter_cubit.dart class CounterCubit extends Cubit counter_page. Lets take a look at how to use BlocBuilder to hook up a CounterPage widget to a CounterCubit. Import 'package:flutter_bloc/flutter_bloc.dart' īoolBloc.*Note: All widgets exported by the flutter_bloc package integrate with both Cubit and Bloc instances.
The BoolBloc: import 'package:bloc/bloc.dart' To make this work properly, and to help with readability, you can simply create an empty class that extends BoolBloc that will be used as a single instance. This is because the method to look up the bloc, BlocProvider.of(context), relies on the specific type of the bloc it is looking up. This Bloc is different from other blocs in that it is not instantiated directly anywhere. So in this case it makes sense to define a separate, simple bloc that just tracks the checkbox’s boolean value. While there may be ways to integrate the stream into an existing bloc (this would be particularly simple you are defining your own bloc classes), the Bloc package is not really designed to juggle several different types of output in one class. For example, we have a simple app with multiple screens and BLoCs that handle different forms of data and need to pass the data between themselves and also save it to a repository that saves them to local storage, and were already feeling a little lost about how to architect it. A checkbox, for example, just needs a single stream of whether it is checked or not, and a way to control the checking and un-checking of the box. In my latest app I found myself wanting a simple bloc that just controls a single bool stream. Or you might have a simple logic requirement that is repeated throughout your app. You may have a single instance of each type of bloc you define in your code, but in some cases it may be useful to have a bloc for each of several similar elements on the page that do roughly the same thing. As a general rule, when you are programming something more than twice to do about the same thing it is probably a good idea to find a way to abstract it.
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