zhiying_base_widget/lib/pages/main_page/main_page.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';
import 'package:zhiying_base_widget/pages/main_page/main_page_bloc.dart';
import 'package:zhiying_base_widget/pages/main_page/notifier/main_page_bg_notifier.dart';
import 'package:zhiying_base_widget/pages/main_page/notifier/main_page_notifier.dart';
import 'package:zhiying_base_widget/widgets/others/mine_header_bg_widget.dart';
import 'package:zhiying_comm/util/base_bloc.dart';
import 'package:zhiying_comm/zhiying_comm.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: MultiProvider(
        providers: [
          ChangeNotifierProvider.value(value: MainPageNotifier()),
          ChangeNotifierProvider.value(value: MainPageBgNotifier()),
        ],
        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);
    if (widget.data.containsKey('mod_id')) {
      _bloc.loadData(widget.data['mod_id']);
    }

    _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 MediaQuery.removePadding(
      removeTop: true,
      context: context,
      child: SmartRefresher(
          enablePullDown: true,
          enablePullUp: false,
          header: WaterDropHeader(),
          controller: _refreshController,
          onLoading: _onLoading,
          child: Container(
            width: double.infinity,
            child: StreamBuilder<List<Map<String, dynamic>>>(
              stream: _bloc.outData,
              builder: (BuildContext context, AsyncSnapshot snapshot) {
                return Stack(
                  fit: StackFit.passthrough,
                  children: <Widget>[
                    MineHeaderBgWidget(
                      controller: _controller,
                    ),
                    CustomScrollView(
                      controller: _controller,
                      slivers: _createContent(context, snapshot.data ?? []),
                    )
                  ],
                );
              },
            ),
          )),
    );
  }

  List<Widget> _createContent(
      BuildContext context, List<Map<String, dynamic>> datas) {
    List<Widget> list = List();
    for (int i = 0; i < datas.length; i++) {
      WidgetModel item =
          WidgetModel.fromJson(Map<String, dynamic>.from(datas[i]));

      print('item.modName ${item.modName}');
      list.addAll(WidgetFactory.create(
        item.modName,
        isSliver: true,
        model: datas[i],
      ));
    }
    print('生成列表widget个数 ${list.length}');
    if (list.length <= 0) {
      list.add(SliverToBoxAdapter(
        child: Container(
          height: 200,
          child: Center(
            child: Text('暂时无数据哦~'),
          ),
        ),
      ));
    }
    return list;
  }
}