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_notifier.dart';
import 'package:zhiying_comm/zhiying_comm.dart';
import 'package:provider/provider.dart';

class MainPage extends StatefulWidget {
  MainPage({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: MainPageContainer(),
      ),
    );
  }
}

class MainPageContainer extends StatefulWidget {
  MainPageContainer({Key key}) : super(key: key);

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

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

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

  @override
  void initState() {
    _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;
    });
    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('index_recommend_list',
        type: _type, isSliver: true));
    return list;
  }

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: CustomScrollView(
        controller: _controller,
        slivers: _createContent(context),
      ),
    );
  }
}