zhiying_base_widget/lib/pages/main_page/main_page.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:zhiying_base_widget/pages/main_page/main_page_bloc.dart';
import 'package:zhiying_base_widget/pages/main_page/main_page_notifier.dart';
import 'package:zhiying_base_widget/pages/main_page/main_page_sk.dart';
import 'package:zhiying_comm/zhiying_comm.dart';
import 'package:provider/provider.dart';
import 'package:zhiying_comm/util/base_bloc.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';

class MainPage extends StatefulWidget {
  final Map<String, dynamic> data;

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

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

class _MainPageState extends State<MainPage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Color(0xfff9f9f9),
      body: ChangeNotifierProvider(
        create: (context) => MainPageNotifier(),
        child: BlocProvider<MainPageBloc>(
          bloc: MainPageBloc(),
          child: _MainPageContainer(widget.data),
        ),
      ),
    );
  }
}

class _MainPageContainer extends StatefulWidget {
  final Map<String, dynamic> data;

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

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

class _MainPageContainerState extends State<_MainPageContainer> {
  WidgetType _type = WidgetType.normal;
  bool _isEnded = false;
  ScrollController _controller = ScrollController();
  MainPageBloc _bloc;

  List<String> items = ["1", "2", "3", "4", "5", "6", "7", "8"];
  RefreshController _refreshController =
      RefreshController(initialRefresh: false);

  void _onRefresh() async {
    // monitor network fetch
    await Future.delayed(Duration(milliseconds: 1000));
    // if failed,use refreshFailed()
    _refreshController.refreshCompleted();
  }

  void _onLoading() async {
    // monitor network fetch
    await Future.delayed(Duration(milliseconds: 1000));
    // if failed,use loadFailed(),if no data return,use LoadNodata()
    items.add((items.length + 1).toString());
    if (mounted) setState(() {});
    _refreshController.loadComplete();
  }

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

  @override
  void initState() {
    _bloc = BlocProvider.of<MainPageBloc>(context);
    _reload();
    _controller.addListener(() {
      // print('${_controller.offset}   ${_controller.position.maxScrollExtent}');
      if (_controller.offset >= _controller.position.maxScrollExtent &&
          !_isEnded) {
        // 滑动到底部
        _isEnded = true;
        Provider.of<MainPageNotifier>(context, listen: false).loadMore();
      } else if (_controller.offset < _controller.position.maxScrollExtent &&
          _isEnded) {
        _isEnded = false;
        Provider.of<MainPageNotifier>(context, listen: false).reset();
      }
    });
    super.initState();
  }

  void _reload() {
    setState(() {
      _type = WidgetType.skeleton;
    });
    WidgetModel model = WidgetModel.fromJson(widget.data);
    if ((model?.components?.length ?? 0) > 0) {
      _bloc.loadData(model.components.map((item) => item.modId).toList());
    }

    // Future.delayed(Duration(seconds: 3), () {
    //   setState(() {
    //     _type = WidgetType.normal;
    //   });
    // });
  }

  List<Widget> _createContent(BuildContext context) {
    List<Widget> list = List();
    list.add(SliverToBoxAdapter(
      child: RaisedButton(
        onPressed: () {
          Provider.of<MainPageNotifier>(context, listen: false).loadMore();
          _reload();
        },
        child: Text('重置'),
      ),
    ));
    list.addAll(WidgetFactory.create('index_carousel',
        type: _type,
        isSliver: true,
        model: Map<String, dynamic>.from({'aaaaa': 'bbbb'})));
    list.addAll(WidgetFactory.create('home_quick_entry', type: _type, isSliver: true));
    list.addAll(WidgetFactory.create('index_recommend_list',
        type: _type, isSliver: true));
    return list;
  }

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<List<List<Map<String, dynamic>>>>(
      stream: _bloc.outData,
      builder: (BuildContext context, AsyncSnapshot snapshot) {
        if (snapshot.data == null) {
          return MainPageSkeleton();
        }

        _type = WidgetType.normal;
        return SmartRefresher(
          enablePullDown: true,
          enablePullUp: true,
          header: WaterDropHeader(),
          footer: CustomFooter(
            builder: (BuildContext context, LoadStatus mode) {
              Widget body;
              if (mode == LoadStatus.idle) {
                body = Text("上拉加载");
              } else if (mode == LoadStatus.loading) {
                body = CupertinoActivityIndicator();
              } else if (mode == LoadStatus.failed) {
                body = Text("加载失败！点击重试！");
              } else if (mode == LoadStatus.canLoading) {
                body = Text("松手,加载更多!");
              } else {
                body = Text("没有更多数据了!");
              }
              return Container(
                height: 55.0,
                child: Center(child: body),
              );
            },
          ),
          controller: _refreshController,
          onRefresh: _onRefresh,
          onLoading: _onLoading,
          child: CustomScrollView(
            controller: _controller,
            slivers: _createContent(context),
          ),
        );
      },
    );
  }
}