Widgets are classes which have their own attributes and constructors. Bloc will provide a single instance of a Bloc to the subtree below. BlocProvider widget creates and provides a Bloc to all its children. It is also known as a dependency injection widget. It takes the build context as an argument and returns only one instance of the Bloc. Context is the context in which a specific widget is built. By default, BlocProvider creates the Bloc lazily. To override it, set the lazy attribute to false.īlocProvider handles the closing part of Blocs automatically.īlocProvider.value- Provides the only instance of Bloc a to the new portion of the tree. Since the only instance of blocA was created where the BlocProvider, it will get automatically closed by the BlocProvider. Providing it to the second page (using blocprovider.value) won’t close the only instance of the Bloc on the second page gets destroyed. ![]() However, the Instance will be closed when needed because of the way it was created in the first place- by using BlocProvider This is because the instance may still be needed in the page above, in the ancestor tree. You can access the current state of a cubit by using the state keyword. Bloc BuilderĪ widget that helps rebuilding the you are based on the Bloc state changes. Reveals the UI every single time A new state is emitted. Rebuilding a large chunk of the UI may require a lot of time to compute that’s why you should rebuild only the widgets being changed. The Builder function can be called multiple times due to how the Flutter engine works. Return widgets based on the bloc’s State.
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