beritaView.dart

import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:intl/intl.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:sistesi/bloc/berita_bloc.dart';
import 'package:sistesi/providers/ApiServices.dart';

import 'detailPengumumanView.dart';

class DaftarBerita extends StatefulWidget {
  @override
  _DaftarBeritaState createState() => _DaftarBeritaState();
}

class _DaftarBeritaState extends State<DaftarBerita> {
  ApiServices apiServices;
  SharedPreferences sharedPreferences;
  String urlFile = "";
  BeritaBloc beritaBloc;
  ScrollController scrollController = ScrollController();

  void onScroll() {
    double maxScroll = scrollController.position.maxScrollExtent;
    double currentScroll = scrollController.position.pixels;

    if (currentScroll == maxScroll) beritaBloc.add(BeritaEvent());
  }

  initSharedPreferences() async {
    sharedPreferences = await SharedPreferences.getInstance();
    urlFile = sharedPreferences.getString("urlFile");
  }

  @override
  void initState() {
    initSharedPreferences();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    daftarBerita(berita) {
      String urlImage = "";
      if (berita.thumbnail == null) {
        urlImage = "https://dev.sistesi.id/basic/public/img/nodata.jpg";
      } else if (berita.thumbnail.toString().contains("https")) {
        urlImage = berita.thumbnail;
      } else {
        urlImage =
            urlFile.toString() + berita.thumbnail.toString();
      }
      return Container(
        height: 100.0,
        child: GestureDetector(
          onTap: () {
            Navigator.push(context, MaterialPageRoute(builder: (context) {
              return PengumumanBeritaView(
                id: berita.id,
                tipe: "b",
              );
            }));
          },
          child: Row(
            children: <Widget>[
              Container(
                height: 80,
                width: 80,
                padding:
                    EdgeInsets.only(left: 0, top: 10, bottom: 70, right: 20),
                decoration: BoxDecoration(
                    image: DecorationImage(
                        image: NetworkImage("$urlImage"), fit: BoxFit.cover)),
              ),
              Padding(
                padding: const EdgeInsets.all(8.0),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.start,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: <Widget>[
                    Container(
                      width: MediaQuery.of(context).size.width * 0.7,
                      child: Text(
                        berita.judul,
                        style: TextStyle(
                            fontWeight: FontWeight.w700, fontSize: 17),
                      ),
                    ),
                    Text(
                        DateFormat('dd MMMM yyyy').format(
                            DateTime.parse(berita.tanggal)),
                        style: TextStyle(color: Colors.grey, fontSize: 12.0)),
                  ],
                ),
              )
            ],
          ),
        ),
      );
    }

    final listPengumuman =
        BlocBuilder<BeritaBloc, BeritaState>(builder: (context, state) {
      beritaBloc = BlocProvider.of<BeritaBloc>(context);
      scrollController.addListener(onScroll);
      if (state is BeritaUninitialized) {
        return Center(
          child: SizedBox(
            width: 30,
            height: 30,
            child: CircularProgressIndicator(),
          ),
        );
      } else {
        BeritaLoaded beritaLoaded = state as BeritaLoaded;
        return ListView.separated(
          controller: scrollController,
          separatorBuilder: (context, index) {
            return Divider(
              color: Colors.grey,
            );
          },
          padding: EdgeInsets.all(6),
          itemCount: (beritaLoaded.hasReachedMax || beritaLoaded.berita.length <= 6)
              ? beritaLoaded.berita.length
              : beritaLoaded.berita.length + 1,
          itemBuilder: (context, index) =>
              (index < beritaLoaded.berita.length)
                  ? daftarBerita(beritaLoaded.berita[index])
                  : Container(
                      child: Center(
                        child: SizedBox(
                          width: 30,
                          height: 30,
                          child: CircularProgressIndicator(),
                        ),
                      ),
                    ),
        );
      }
    });

    final _appBAr = CupertinoNavigationBar(
      middle: Text(
        "Daftar Berita",
        style: TextStyle(color: Colors.black),
      ),
      automaticallyImplyLeading: true,
    );
    return Scaffold(
      appBar: _appBAr,
      body: BlocProvider<BeritaBloc>(
          builder: (context) => BeritaBloc()..add(BeritaEvent()),
          child: listPengumuman),
    );
  }
}