huixiang_app/lib/community/community_course.dart

import 'package:dio/dio.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_easyloading/flutter_easyloading.dart';
import 'package:huixiang/main.dart';
import 'package:huixiang/retrofit/data/banner.dart';
import 'package:huixiang/retrofit/data/base_data.dart';
import 'package:huixiang/retrofit/data/brand.dart';
import 'package:huixiang/retrofit/data/brand_data.dart';
import 'package:huixiang/retrofit/data/category_select_list.dart';
import 'package:huixiang/retrofit/data/collect_class_list.dart';
import 'package:huixiang/retrofit/data/course_details.dart';
import 'package:huixiang/retrofit/data/course_list.dart';
import 'package:huixiang/retrofit/data/page.dart';
import 'package:huixiang/retrofit/retrofit_api.dart';
import 'package:huixiang/utils/event_type.dart';
import 'package:huixiang/view_widget/classic_header.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:huixiang/view_widget/login_tips_dialog.dart';
import 'package:huixiang/view_widget/store_title_tab.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'community_view/class_list_view.dart';
import 'community_view/class_title_tab.dart';
import 'community_view/course_banner.dart';
import 'community_view/home_class.dart';

class CommunityCourse extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _CommunityCourse();
  }
}

class _CommunityCourse extends State<CommunityCourse>
    with SingleTickerProviderStateMixin, AutomaticKeepAliveClientMixin {
  final ScrollController scrollController = ScrollController();
  final RefreshController refreshController = RefreshController();

  ApiService apiService;
  List<Brand> brands = [];
  BrandData brandData;
  List<GlobalKey> globaKeys = [];
  List<BannerData> bannerData = [];
  List<CategorySelectList> classSelectList = [];
  List<CourseList> classList = [];
  List<CourseList> classTabList = [];
  List<CollectClassList> collectList = [];
  List<CourseList> collect = [];
  int checkIndex = 0;

  @override
  void initState() {
    super.initState();

    eventBus.on<EventType>().listen((event) {
      print("object: CommunityCourse");
      if (event.type < 3) {
        setState(() {});
      }
    });
    queryCourseBanner();
    classListAsync();
    collectionList();
  }

  ///banner
  queryCourseBanner() async {
    BaseData<PageInfo<BannerData>> banner = await apiService.queryBanner({
      "model": {"type": "COURSE_BANNER"},
    }).catchError((error) {
      refreshController.refreshFailed();
    });
    bannerData.clear();
    bannerData.addAll(banner.data.records);
  }

  ///课程分类列表
  classListAsync() async {
    if (apiService == null) {
      SharedPreferences value = await SharedPreferences.getInstance();
      apiService = ApiService(
        Dio(),
        context: context,
        token: value.getString("token"),
      );
    }
    BaseData<List<CategorySelectList>> baseData = await apiService.categoryList().catchError((onError) {});
    if (baseData != null && baseData.isSuccess) {
      setState(() {
        classSelectList = baseData.data;
      });
      queryClassList("");
    }
    EasyLoading.dismiss();
  }

  ///课程列表
  queryClassList(categoryId) async {
    if (apiService == null) {
      SharedPreferences value = await SharedPreferences.getInstance();
      apiService = ApiService(
        Dio(),
        context: context,
        token: value.getString("token"),
      );
    }
    BaseData<PageInfo<CourseList>> baseData = await apiService.courseList({
      "categoryId":categoryId,
      "pageNum": 1,
      "pageSize":10,
      "searchKey": "",
      "state":0
    }).catchError((error) {
      if(categoryId == ""){
        refreshController.refreshFailed();
        refreshController.loadFailed();
      }
    });

    if (baseData.isSuccess) {
      if(categoryId == "") {
        refreshController.refreshCompleted();
        refreshController.loadComplete();
        setState(() {
          classList.clear();
          classList.addAll(baseData.data.list);
        });
        if(classSelectList.length > 0)
          queryClassList(classSelectList[checkIndex].id);
      }else{
        setState(() {
          classTabList.clear();
          classTabList.addAll(baseData.data.list);
        });
      }
    }
  }

  ///课程的合集列表
  collectionList() async {
    if (apiService == null) {
      SharedPreferences value = await SharedPreferences.getInstance();
      apiService = ApiService(
        Dio(),
        context: context,
        token: value.getString("token"),
      );
    }
    BaseData<List<CollectClassList>> baseData = await apiService.collectList().catchError((onError) {});
    if (baseData != null && baseData.isSuccess) {
      setState(() {
        collectList.clear();
        collectList.addAll(baseData.data);
        if(collectList.length > 0)
          collectCourse(collectList[0].id);
      });
    }
    EasyLoading.dismiss();
  }

  ///合集包含的课程列表
  collectCourse(collectId) async {
    if (apiService == null) {
      SharedPreferences value = await SharedPreferences.getInstance();
      apiService = ApiService(
        Dio(),
        context: context,
        token: value.getString("token"),
      );
    }
    BaseData<List<CourseList>> baseData = await apiService.collect(collectId).catchError((error) {
    });
    if (baseData != null && baseData.isSuccess) {
      setState(() {
        collect.clear();
        collect.addAll(baseData.data);
      });
    }
  }

  _onRefresh(){
    classListAsync();
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return
      Stack(
      children: [
        Positioned(
          child: Container(
            child: SmartRefresher(
              controller: refreshController,
              enablePullDown: true,
              enablePullUp: false,
              header: MyHeader(),
              physics: ClampingScrollPhysics(),
              onRefresh: _onRefresh,
              scrollController: scrollController,
              child: Container(
                child: SingleChildScrollView(
                  physics: NeverScrollableScrollPhysics(),
                  child: Container(
                    color: Color(0xFFF7F7F7),
                    margin: EdgeInsets.only(top: 16.h),
                    child: Column(
                      children: classChildItem(),
                    ),
                  ),
                ),
              ),
            ),
          ),
          bottom:0,
          top: 0,
          left: 0,
          right: 0,
        ),
        if (brands != null && brands.length > 0)
          Positioned(
            child: Container(
              color: Colors.white,
              child: StoreTitleTab(
                brands,
                globaKeys,
                scrollController,
                isScroll: true,
              ),
            ),
            top: 0,
            left: 0,
            right: 0,
          ),
      ],
    );
  }

  List<Widget> classChildItem() {
    var widgets = <Widget>[
      ///课程banner
      CourseBanner(bannerData),

      SizedBox(height: 28),

      ///回乡小课堂
      HomeClass(collect,collectList),

      ///课程导航栏
      ClassTitleTab(classSelectList,(index){
        checkIndex = index;
        queryClassList(classSelectList[index].id);
      }),

      ///课程列表
      ClassListView(classTabList),

    ];

    return widgets;
  }

  @override
  bool get wantKeepAlive => true;
}