mobile-app/lib/presentation/screens/plot/sc_plot.dart

import 'package:farm_tpf/data/repository/repository.dart';
import 'package:farm_tpf/main.dart';
import 'package:farm_tpf/models/index.dart';
import 'package:farm_tpf/presentation/custom_widgets/bottom_loader.dart';
import 'package:farm_tpf/presentation/custom_widgets/loading_list_page.dart';
import 'package:farm_tpf/presentation/screens/plot/widget_search.dart';
import 'package:farm_tpf/presentation/screens/plot_detail/sc_plot_detail.dart';
import 'package:farm_tpf/utils/const_color.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:farm_tpf/utils/const_string.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:farm_tpf/utils/formatter.dart';

import 'bloc/plot_bloc.dart';

class PlotListScreen extends StatefulWidget {
  @override
  _PlotListScreenState createState() => _PlotListScreenState();
}

class _PlotListScreenState extends State<PlotListScreen> {
  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (context) =>
          PlotBloc(repository: Repository())..add(DataFetched()),
      child: HoldInfinityWidget(),
    );
  }
}

class HoldInfinityWidget extends StatelessWidget {
  final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        key: _scaffoldKey,
        appBar: AppBar(
          centerTitle: true,
          title: Text("Danh sách lô"),
          actions: <Widget>[
            IconButton(
                icon: Icon(FontAwesomeIcons.qrcode),
                onPressed: () {
                  scan(context);
                })
          ],
        ),
        body: InfinityView());
  }
}

class InfinityView extends StatefulWidget {
  @override
  _InfinityViewState createState() => _InfinityViewState();
}

class _InfinityViewState extends State<InfinityView> {
  final _scrollController = ScrollController();
  final _scrollThreshold = 250.0;
  PlotBloc _plotBloc;

  @override
  void initState() {
    _scrollController.addListener(() {
      final maxScroll = _scrollController.position.maxScrollExtent;
      final currentScroll = _scrollController.position.pixels;
      if (maxScroll - currentScroll < _scrollThreshold) {
        _plotBloc.add(DataFetched());
      }
    });
    _plotBloc = BlocProvider.of<PlotBloc>(context);
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        WidgetSearch(),
        Expanded(child: BlocBuilder<PlotBloc, PlotState>(
          builder: (context, state) {
            if (state is PlotFailure) {
              return Center(child: Text(state.errorString));
            }
            if (state is PlotSuccess) {
              if (state.items.isEmpty) {
                return Center(child: Text(label_list_empty));
              }
              return RefreshIndicator(
                  child: ListView.builder(
                    physics: AlwaysScrollableScrollPhysics(),
                    itemBuilder: (BuildContext context, int index) {
                      return index >= state.items.length
                          ? BottomLoader()
                          : ItemInfinityWidget(item: state.items[index]);
                    },
                    itemCount: state.hasReachedMax
                        ? state.items.length
                        : state.items.length + 1,
                    controller: _scrollController,
                  ),
                  onRefresh: () async {
                    _plotBloc.add(OnRefresh());
                  });
            }
            return Center(
              child: LoadingListPage(),
            );
          },
        ))
      ],
    );
  }

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

class ItemInfinityWidget extends StatelessWidget {
  final Crop item;

  const ItemInfinityWidget({Key key, @required this.item}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    var backgroundColor;
    var textColor;
    switch (item.status) {
      case "STATUS_ARE_ACTIVE":
        backgroundColor = Colors.white;
        textColor = COLOR_CONST.DEFAULT;
        break;
      case "STATUS_FINISHED":
        backgroundColor = COLOR_CONST.DEFAULT;
        textColor = Colors.white;
        break;
      default:
        backgroundColor = Colors.white;
        textColor = Colors.black;
    }

    return GestureDetector(
        child: Card(
          color: backgroundColor,
          child: ListTile(
            title: Text("${item.code ?? ''} - ${item.suppliesName ?? ''}",
                style: TextStyle(color: textColor)),
            subtitle: Text(item.startDate.format_DDMMYY_HHmm().toString(),
                style: TextStyle(color: textColor)),
            trailing: Text(
                item.areaM2.formatNumtoStringDecimal().toString() + " m\u00B2",
                style: TextStyle(color: textColor)),
          ),
        ),
        onTap: () {
          Navigator.push(
              context,
              MaterialPageRoute(
                  builder: (BuildContext context) => PlotDetailScreen(
                        cropId: item.id,
                        initialIndex: 1,
                      )));
        });
  }
}