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_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: SafeArea(
        child: 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> {
  bool _isEnded = false;
  ScrollController _controller = ScrollController();
  MainPageBloc _bloc;
  RefreshController _refreshController =
      RefreshController(initialRefresh: false);

  void _onLoading() async {
    // await Future.delayed(Duration(milliseconds: 1000));
    // if (mounted) setState(() {});
    // _refreshController.loadComplete();
  }

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

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

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<Map<String, dynamic>>(
      stream: _bloc.outData,
      builder: (BuildContext context, AsyncSnapshot snapshot) {
        return SmartRefresher(
          enablePullDown: true,
          enablePullUp: false,
          header: WaterDropHeader(),
          controller: _refreshController,
          onLoading: _onLoading,
          child: CustomScrollView(
            controller: _controller,
            slivers: _createContent(context),
          ),
        );
      },
    );
  }

  List<Widget> _createContent(BuildContext context) {
    WidgetModel model = WidgetModel.fromJson(widget.data);

    List<Widget> list = List();
    for (int i = 0; i < model.components.length; i++) {
      WidgetModel item = model.components[i];
      Map<String, dynamic> data = null;
      if (widget.data.containsKey('components')) {
        data = widget.data['components'][i];
      }

      list.addAll(WidgetFactory.create(
        item.modName,
        type: WidgetType.skeleton,
        isSliver: true,
        model: data,
      ));
    }
    model.components.forEach((item) {});
    return list;
  }
}