huixiang_app/lib/home/help_farmers/help_farmers_page.dart

import 'package:dio/dio.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_easyloading/flutter_easyloading.dart';
import 'package:flutter_smart_dialog/flutter_smart_dialog.dart';
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
import 'package:huixiang/home/help_farmers/farmers_tab.dart';
import 'package:huixiang/retrofit/retrofit_api.dart';
import 'package:huixiang/view_widget/classic_header.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:huixiang/view_widget/my_footer.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../../generated/l10n.dart';
import '../../retrofit/data/base_data.dart';
import '../../retrofit/data/farmers_list.dart';
import '../../utils/flutter_utils.dart';
import '../../utils/font_weight.dart';
import '../../view_widget/custom_image.dart';
import '../../view_widget/my_tab.dart';
import '../../view_widget/no_data_view.dart';

class HelpFarmersPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _HelpFarmersPage();
  }
}

class _HelpFarmersPage extends State<HelpFarmersPage> {
  ApiService apiService;
  final RefreshController refreshController = RefreshController();
  List<FarmersList> farmersList = [];
  int tabIndex = 0;

  @override
  void initState() {
    super.initState();
    SharedPreferences.getInstance().then((value) => {
      apiService = ApiService(
        Dio(),
        context: context,
        token: value.getString('token'),
          // showLoading: true
      ),
    queryConfig(),
    });
  }

  ///助农列表
  queryConfig() async {
    try{
      if (apiService == null) {
        SharedPreferences value = await SharedPreferences.getInstance();
        apiService = ApiService(
            Dio(),
            context: context,
            token: value.getString("token"),
        );
      }
      BaseData<List<FarmersList>> baseData =
      await apiService.getConfig().catchError((error) {
        SmartDialog.showToast(AppUtils.dioErrorTypeToString(error.type),
            alignment: Alignment.center);
        refreshController.refreshFailed();
      });
      if (baseData != null && baseData.isSuccess) {
        farmersList.clear();
        farmersList.addAll(baseData.data);
        refreshController.refreshCompleted();
      } else {
        refreshController.refreshFailed();
      }
    }finally{
      setState(() {});
      EasyLoading.dismiss();
    }

  }


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.transparent,
      body: NestedScrollView(
        headerSliverBuilder: (context, inner) {
          return [
            SliverAppBar(
              pinned: true,
              backgroundColor: Colors.white,
              elevation: 0,
              leading: GestureDetector(
                onTap: () {
                  Navigator.of(context).pop();
                },
                child: Container(
                  alignment: Alignment.centerRight,
                  margin: EdgeInsets.only(left: 10.w),
                  padding: EdgeInsets.all(6),
                  child: Icon(
                    Icons.arrow_back_ios,
                    color: Colors.white,
                    size: 24,
                  ),
                ),
              ),
              ///去掉返回按钮
              // automaticallyImplyLeading: false,
              centerTitle: true,
              flexibleSpace: FlexibleSpaceBar(
                  background: MImage(
                    (farmersList.isNotEmpty)?farmersList[tabIndex]?.agriculturaListImg : "",
                    fit: BoxFit.fill,
                    width: double.infinity,
                    height: 354.h,
                    errorSrc: "assets/image/default_1.webp",
                    fadeSrc: "assets/image/default_1.webp",
                  )),
              expandedHeight: 354.h,
              bottom: PreferredSize(
                preferredSize: Size(double.infinity, 0),
                child: DefaultTabController(
                  length: farmersList.length,
                  child: Container(
                    alignment: Alignment.center,
                    decoration: BoxDecoration(
                      borderRadius: BorderRadius.vertical(
                      top: Radius.circular(16),
                    ),
                      color: Color(0xFF32A060),
                    ),
                    padding: EdgeInsets.only(top:7.h,bottom: 7.h),
                    child: TabBar(
                      isScrollable: true,
                      //可滚动
                      indicatorColor: Colors.white,
                      labelColor: Colors.white,
                      labelStyle: TextStyle(
                        fontSize: 16.sp,
                        fontWeight: FontWeight.bold,
                      ),
                      unselectedLabelStyle: TextStyle(
                        fontSize: 14.sp,
                        fontWeight: MyFontWeight.regular,
                      ),
                      indicator: FarmersTab(),
                      // controller: tabController,
                      //未选中文字颜色
                      unselectedLabelColor: Colors.white,
                      indicatorSize: TabBarIndicatorSize.label,
                      //指示器与文字等宽
                      tabs: farmersList == null
                          ? []
                          : farmersList
                          .map((e) => MyTab(text: e.typeName))
                          .toList(),
                      onTap: (index) {
                        // queryConfig("AgriculturalList");
                        tabIndex = index;
                        queryConfig();
                        setState(() {});
                      },
                    ),
                  ),
                ),
              ),
            ),
          ];
        },
        body:  recommend(),
      ),
    );
  }

  ///为你推荐
  Widget recommend() {
    return Container(
      color: Colors.white,
      padding: EdgeInsets.symmetric(horizontal: 10.w),
      child: (farmersList.isNotEmpty && farmersList[tabIndex].goodList.length == 0)
          ? NoDataView(
        src: "assets/image/xiao_fei.webp",
        isShowBtn: false,
        text: "当前分类暂无商品",
        fontSize: 16.sp,
        margin: EdgeInsets.only(top: 120.h, left: 60.w, right: 60.w),
      )
          : StaggeredGridView.countBuilder(
        crossAxisCount: 2,
        shrinkWrap: true,
        itemCount: (farmersList != null && farmersList.isNotEmpty) ? farmersList[tabIndex].goodList.length : 0,
        mainAxisSpacing: 10,
        crossAxisSpacing: 10,
        physics: BouncingScrollPhysics(),
        itemBuilder: (context, position) {
          return GestureDetector(
            onTap: () {
              Navigator.of(context)
                  .pushNamed('/router/shop_details_page', arguments: {
                "id": farmersList[tabIndex].goodList[position].id,
                "storeId": farmersList[tabIndex].goodList[position].storeId,
              });
            },
            child: recommendItem(farmersList[tabIndex].goodList[position]),
          );
        },
        staggeredTileBuilder: (position) {
          return StaggeredTile.fit(1);
        },
      ),
    );
  }

  Widget recommendItem(GoodList goodList) {
    return Container(
      width: 173,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(6),
        boxShadow: [
          BoxShadow(
            color: Color(0x1A213303),
            offset: Offset(0, 2),
            blurRadius: 4,
            spreadRadius: 0,
          )
        ],
        color: Colors.white,
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          MImage(
            goodList.productImg ?? "",
            fit: BoxFit.fill,
            width:double.infinity,
            height: 174,
            radius: BorderRadius.only(
              topLeft: Radius.circular(6),
              topRight: Radius.circular(6),
            ),
            errorSrc: "assets/image/default_1.webp",
            fadeSrc: "assets/image/default_1.webp",
          ),
          Padding(
            padding: EdgeInsets.only(top: 7.h, left: 10.w, bottom: 8.h),
            child: Text(
              goodList?.productName ?? "",
              maxLines: 2,
              overflow: TextOverflow.ellipsis,
              style: TextStyle(
                fontSize: 14.sp,
                height: 1.3.h,
                fontWeight: MyFontWeight.medium,
                color: Color(0xFF0D0D0D),
              ),
            ),
          ),
          Padding(
            padding: EdgeInsets.only(left: 10.w, bottom: 12.h),
            child:Row(
              children: [
                Text(
                  AppUtils.calculateDouble(double.tryParse(goodList?.price) ?? 0),
                  style: TextStyle(
                    fontSize:24.sp,
                    fontFamily: 'APPHT',
                    fontWeight: MyFontWeight.medium,
                    color: Color(0xFF32A060),
                  ),
                ),
                Container(
                  margin: EdgeInsets.only(left: 8.w),
                  padding: EdgeInsets.symmetric(vertical:3.h,horizontal: 9.w),
                  decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(100),
                  boxShadow: [
                    BoxShadow(
                      color: Color(0x1A213303),
                      offset: Offset(0, 2),
                      blurRadius: 4,
                      spreadRadius: 0,
                    )
                  ],
                 color: Color(0xFF32A060),
                ),
                  child:
                  Text(
                    S.of(context).zhunongjifen,
                    style: TextStyle(
                      fontSize:12.sp,
                      fontWeight: MyFontWeight.medium,
                      color: Colors.white,
                    ),
                  ),
                )
              ],
            ),
          ),
        ],
      ),
    );
  }
}