Using Bloc to pass data backward

home_page.dart

class _HomePageState extends State<HomePage> {
  File _image;
  final picker = ImagePicker();

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Scaffold(
        body: Center(
          child: BlocBuilder<PhotoBloc, PhotoState>(
            cubit: BlocProvider.of<PhotoBloc>(
                context), // provide the local bloc instance
            builder: (context, state) {
              return Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  GestureDetector(
                    onTap: () {
                      _showSelectionDialog();
                    },
                    child: Container(
                      height: 150,
                      width: 150,
                      child: state is PhotoInitial
                          ? Image.asset(
                              'assets/images/user.png') // set a placeholder image when no photo is set
                          : Image.file((state as PhotoSet).photo),
                    ),
                  ),
                  SizedBox(height: 50),
                  Text(
                    state is PhotoInitial
                        ? 'Please select your profile photo'
                        : 'Nice photo:)',
                    style: TextStyle(fontSize: 22),
                  ),
                ],
              );
            },
          ),
        ),
      ),
    );
  }