zhiying_base_widget/lib/widgets/home/home_goods/home_goods.dart

import 'dart:convert' as convert;

import 'package:event_bus/event_bus.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:zhiying_base_widget/pages/main_page/notifier/main_page_notifier.dart';
import 'package:zhiying_base_widget/widgets/home/home_goods/bloc/home_goods_bloc.dart';
import 'package:zhiying_base_widget/widgets/home/home_goods/home_goods_creater.dart';
import 'package:zhiying_base_widget/widgets/home/home_goods/home_goods_item.dart';
import 'package:zhiying_base_widget/widgets/home/home_goods/home_goods_item_single.dart';
import 'package:zhiying_base_widget/widgets/home/home_goods/models/home_goods_model.dart';
import 'package:zhiying_base_widget/widgets/home/home_goods/models/home_goods_style_model.dart';
import 'package:zhiying_base_widget/widgets/home/home_goods/skeleton/home_goods_sk.dart';
import 'package:zhiying_comm/util/base_bloc.dart';

class HomeGoods extends StatefulWidget {
  final Map<String, dynamic> data;
  final EventBus eventBus;

  HomeGoods(this.data, {Key key, this.eventBus}) : super(key: key);

  @override
  _HomeGoodsState createState() => _HomeGoodsState();
}

class _HomeGoodsState extends State<HomeGoods> {
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return BlocProvider<HomeGoodsBloc>(
      bloc: HomeGoodsBloc(),
      child: _HomeGoodsContainer(widget.data, widget.eventBus),
    );
  }
}

class _HomeGoodsContainer extends StatefulWidget {
  final Map<String, dynamic> data;
  final EventBus eventBus;

  _HomeGoodsContainer(this.data, this.eventBus, {Key key}) : super(key: key);

  @override
  _HomeGoodsContainerState createState() => _HomeGoodsContainerState();
}

class _HomeGoodsContainerState extends State<_HomeGoodsContainer> {
  HomeGoodsBloc _bloc;
  String _provider = '';
  HomeGoodsStyleModel _style;

  @override
  void initState() {
    _bloc = BlocProvider.of<HomeGoodsBloc>(context);

    String d = widget.data['data'];
    dynamic json = convert.jsonDecode(d);
    _style = HomeGoodsStyleModel.fromJson(Map<String, dynamic>.from(json));

    widget.eventBus.on<HomeGoodsHeaderEvent>().listen((data) {
      _provider = data.provider;
      _bloc.loadMore(_provider);
    });

    super.initState();
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    print('didChangeDependencies');
    bool isNeedLoadMore = Provider.of<MainPageNotifier>(context).scrollEnd;
    if (isNeedLoadMore && _provider != '') {
      print('HomeGoods loadmore...');
      _bloc.loadMore(_provider);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      width: double.infinity,
      child: StreamBuilder<List<HomeGoodsModel>>(
        stream: _bloc.outData,
        builder: (BuildContext context, AsyncSnapshot snapshot) {
          if (snapshot.data == null) {
            return HomeGoodsSkeleton();
          }

          List<HomeGoodsModel> goods = snapshot.data;
          int column = int.tryParse(_style.listColumn);
          column = column <= 0 ? 1: column;
          int count = (goods.length / column).ceil();
          return ListView.builder(
              shrinkWrap: true,
              physics: NeverScrollableScrollPhysics(),
              itemCount: count,
              itemBuilder: (context, index) {
                if (column == 1) {
                  return HomeGoodsItemSingle(
                    goods[index],
                    _style,
                    data: widget.data,
                  );
                } else {
                  // return Container(color: Colors.red, height: 126,margin: EdgeInsets.all(10),);
                  return Padding(
                    padding: const EdgeInsets.only(left: 5, right: 5),
                    child: Row(children: List.generate(column, (c) {
                      int i = index * column + c;
                      return Expanded
                        (child: i < goods.length ? HomeGoodsItem(
                        goods[i],
                        _style,
                        data: widget.data,
                      ): Container(),);
                    }).toList(),),
                  );
                }
              });
        },
      ),
    );
  }
}