zhiying_base_widget/lib/pages/main_page/main_page.dart

import 'dart:convert';
import 'dart:ui';

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/home/home_auth/home_auth.dart';
import 'package:zhiying_base_widget/widgets/mine/mine_nav/mine_nav_bg.dart';
import 'package:zhiying_base_widget/widgets/others/mine_header_bg_widget.dart';
import 'package:zhiying_base_widget/widgets/refresh/refresh_header/refresh_header.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 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);

  Widget _floatWidget;

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

  void _onRefresh() async {
    // await Future.delayed(Duration(milliseconds: 3000));
    // _refreshController.refreshCompleted();

    if (widget.data.containsKey('skip_identifier')) {
      _bloc.loadData(widget.data['skip_identifier']);
    }
  }

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

  @override
  void initState() {
    _bloc = BlocProvider.of<MainPageBloc>(context);
    if (widget.data.containsKey('skip_identifier')) {
      _bloc.loadData(widget.data['skip_identifier']);
    }

    _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) {
    double top = MediaQueryData.fromWindow(window).padding.top;
    return StreamBuilder<List<Map<String, dynamic>>>(
        stream: _bloc.outData,
        builder: (BuildContext context, AsyncSnapshot snapshot) {
          List widgets = _createContent(context, snapshot.data ?? []);
          _refreshController.refreshCompleted();
          Widget bgWidget = validateBgWidget(context, snapshot.data ?? []);
          return Scaffold(
            backgroundColor: Color(0xfff9f9f9),
            floatingActionButton: _floatWidget,
            floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
            body: MediaQuery.removePadding(
              removeTop: true,
              context: context,
              child: Container(
                width: double.infinity,
                child: Stack(
                  fit: StackFit.passthrough,
                  children: <Widget>[
                    MineHeaderBgWidget(
                      bgWidget: bgWidget,
                      controller: _controller,
                    ),
                    SmartRefresher(
                      enablePullDown: true,
                      enablePullUp: false,
                      header: RefreshHeader(
                        offsetY: top,
                      ),
                      controller: _refreshController,
                      onLoading: _onLoading,
                      onRefresh: _onRefresh,
                      child: CustomScrollView(
                        controller: _controller,
                        slivers: widgets,
                      ),
                    )
                  ],
                ),
              ),
            ),
          );
        });
  }

  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}');
      if (item.modName == 'index_taobao_auth_tip') {
        _floatWidget = HomeAuth(datas[i]);
        continue;
      }
      list.addAll(WidgetFactory.create(
        item.modName,
        isSliver: true,
        model: datas[i],
      ));
    }
    if (list.length <= 0) {
      list.add(SliverToBoxAdapter(
        child: Container(
          height: 200,
          // child: Center(
          //   child: Text('暂时无数据哦~'),
          // ),
        ),
      ));
    }
    return list;
  }



  ///处理特殊背景图
  Widget validateBgWidget(BuildContext context, List<Map<String, dynamic>> datas) {
    for (int i = 0; i < datas.length; i++) {
      WidgetModel item = WidgetModel.fromJson(Map<String, dynamic>.from(datas[i]));
      if (item.modName == "profile_background") {
        final double statusBarHeight = MediaQuery.of(context).padding.top;
        String url=json.decode(item.data)['img'];
        return Container(
          width: double.infinity,
          height: statusBarHeight + 250,
          child: CachedNetworkImage(
            imageUrl: url,
            fit: BoxFit.fitHeight,
          ),
        );
      }
    }
    return null;
  }
}