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/dialog/loading/loading.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_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;
  bool _isFirstLoading = true;

  @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) {
      if (!_isFirstLoading) {
        // 老板说打开app的时候，第一次加载不要显示loading
        Loading.show(context);
      }
      _isFirstLoading = false;
      _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 StreamBuilder<List<HomeGoodsModel>>(
      stream: _bloc.outData,
      builder: (BuildContext context, AsyncSnapshot snapshot) {
        // if (snapshot.data == null) {
        //   return SliverToBoxAdapter(
        //     child: HomeGoodsSkeleton(),
        //   );
        // }
        Loading.dismiss();
        List<HomeGoodsModel> goods = snapshot.data;
        int column = int.tryParse(_style.listColumn);
        column = column <= 0 ? 1 : column;
        int count = ((goods?.length ?? 0) / column).ceil();
        return SliverList(
          delegate: SliverChildBuilderDelegate((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(),
                ),
              );
            }
          }, childCount: count),
        );
      },
    );
  }
}