home_screen.dart

class HomeScreen extends StatefulWidget {
  HomeScreen();

  @override
  _HomeScreenState createState() {
    return _HomeScreenState();
  }
}

class _HomeScreenState extends State<HomeScreen> {

  final postBloc = PostBloc();

  @override
  void initState() {
    super.initState();
    postBloc.eventSink.add(PostBlocAction.FetchPosts);
  }

  @override
  void dispose() {
    super.dispose();
    postBloc.dispose();
  }

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      body: StreamBuilder<PostResponse>(
      stream: postBloc.postStream,
      builder: (context, snapshotPostData) {
        if (snapshotPostData.hasData) {
          if (snapshotPostData.data == null) {
            return Container();
          } else {
            if(snapshotPostData.data == null || snapshotPostData.data.length == 0){
              return Text("No Data Found!");
            }else{
              return Container(
                height: MediaQuery.of(context).size.height,
                width: MediaQuery.of(context).size.width,
                margin: EdgeInsets.fromLTRB(0, 20, 0, 0),
                child: ListView.builder(
                  padding: EdgeInsets.only(
                    top: 20.0,
                    left: 20.0,
                    bottom: 20.0,
                    right: 20.0,
                  ),
                  itemCount: snapshotPostData.data.length,
                  itemBuilder: (context, index) {
                    return Padding(
                      padding: EdgeInsets.only(
                        bottom: 5,
                      ),
                      child: ListTile(
                        title: snapshotPostData.data[index].title,
                        subtitle: snapshotPostData.data[index].body,
                      ),
                    );
                  },
                ),
              );
            }
          }
        } else if (snapshotPostData.hasError) {
          return Padding(
            padding: EdgeInsets.only(
              top: 10.0,
              left: 20.0,
              bottom: 20.0,
              right: 20.0,
            ),
            child: Center(
              child: Text('${snapshotPostData.error}'),
            ),
          );
        }
        return Padding(
          padding: EdgeInsets.all(20.0),
          child: Center(
            child: CircularProgressIndicator(
                valueColor: new AlwaysStoppedAnimation<Color>(
                    Colors.blue)),
          )
        );
      },
    ), );
  }
}