flutter/lib/pages/index/index.dart

/// 首页模板
library;

import 'dart:ui';

import 'package:card_swiper/card_swiper.dart';
import 'package:flutter/material.dart';
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
import 'package:get/get.dart';
import 'package:loopin/IM/im_friend_listeners.dart';
import 'package:loopin/api/shop_api.dart';
import 'package:loopin/components/custom_pageview_indicator.dart';
import 'package:loopin/components/custom_sticky_header.dart';
import 'package:loopin/components/empty_tip.dart';
import 'package:loopin/components/loading.dart';
import 'package:loopin/components/network_or_asset_image.dart';
import 'package:loopin/service/http.dart';
import 'package:loopin/styles/index.dart';
import 'package:loopin/utils/index.dart';
import 'package:loopin/utils/network_utils.dart';

import '../../behavior/custom_scroll_behavior.dart';
import '../../components/backtop.dart';

class IndexPage extends StatefulWidget {
  const IndexPage({super.key});

  @override
  State<IndexPage> createState() => _IndexPageState();
}

class _IndexPageState extends State<IndexPage> with TickerProviderStateMixin {
  ///-----------

  // 瀑布流列表
  List waterfallData = [
    {
      'price': 199.00,
      'title': '韩料界的萨莉亚！',
      'shop': '萨莉亚专卖店',
      'image': 'https://qcloud.dpfile.com/pc/1c3egbzM_ICz90dhi6MAiTsazjxWYQcHCd-sbpD1Wqtph2eIJA04NCRvoGqL4_opG45IiB1YIyNuDTtqzVRwesm_qA1Pf8rFcayTY-n-rG8.jpg',
      'saleNum': '2.1万'
    },
    {
      'price': 1499.90,
      'title': '茅台（MOUTAI）飞天 53%vol 500ml 贵州茅台酒（带杯）',
      'shop': '茅台京东自营旗舰店',
      'image': 'https://img13.360buyimg.com/n1/jfs/t1/97097/12/15694/245806/5e7373e6Ec4d1b0ac/9d8c13728cc2544d.jpg',
      'saleNum': '1254'
    },
    {
      'price': 18.90,
      'title': '上海街头苹果糖！一口一个不吱声',
      'shop': '芝洛洛自营旗舰店',
      'image': 'https://p0.meituan.net/coverpic/f0eefdfa02619fb09ca53eacd4d97231123115.jpg',
      'saleNum': '1.2万'
    },
    {
      'price': 59.00,
      'title': '谁懂，就是这个菜，尝了第一口，立马决定加单了，真正的咸甜永动机啊🍬 去过云南的朋友都知道，当地的乳扇真的很好吃。',
      'shop': '薄荷牛舌卷旗舰店',
      'image': 'https://qcloud.dpfile.com/pc/UcW-v6AN1TxVTt9--5Kaw2-t4W55jUhEG_pM5S-w_AQ4IP3z9WxHzwJ9fOthIjEYY0q73sB2DyQcgmKUxZFQtw.jpg',
      'saleNum': '1639'
    },
    {
      'price': 2499.00,
      'title': '小米 REDMI K80 国家补贴 第三代骁龙 8 6550mAh大电池 澎湃OS 玄夜黑 12GB+256GB 红米5G至尊手机',
      'shop': '小米京东自营旗舰店',
      'image': 'https://img10.360buyimg.com/n1/s450x450_jfs/t1/264409/38/13856/102861/678dcfdaFb723c58f/5b97cf154bbba96c.jpg',
      'saleNum': '9726'
    },
    {
      'price': 1.00,
      'title': '圣菲尔伯爵法国红酒Saintfilcount干红葡萄酒珍藏13.5度单瓶送礼红酒 一元试饮',
      'shop': '小森葡萄酒专营店',
      'image': 'https://img10.360buyimg.com/n7/jfs/t1/226168/23/3411/118733/65537e5fF2db2d109/7d1d11a8013d6e8f.jpg',
      'saleNum': '9.9万'
    },
    {
      'price': 42.00,
      'title': '美的（Midea）LED便携充电小台灯书桌学习阅读灯学生宿舍卧室床头灯学习台灯',
      'shop': '美的（Midea）旗舰店',
      'image': 'https://img14.360buyimg.com/mobilecms/s360x360_jfs/t1/226233/4/10194/156936/658e8f88Fcfc9cb40/cea4a48783f11a7a.jpg',
      'saleNum': '5106'
    },
    {
      'price': 22.90,
      'title': '蒙都 羊杂500g 加热即食 京东超市肉干肉脯及礼包11.11真便宜',
      'shop': '蒙都旗舰店',
      'image': 'https://img10.360buyimg.com/n7/jfs/t1/155306/32/25324/231912/62d22fb8E4ffab855/c6001ee702fb240a.jpg',
      'saleNum': '1.6万'
    },
    {
      'price': 19.90,
      'title': '『 江西炒米粉 』本次最佳😋香就一个字话。锅气的香🔥干辣椒的焦香🌶️油的润香🐷蔬菜混合的清香🥬',
      'shop': '去月球野餐嗎',
      'image': 'https://qcloud.dpfile.com/pc/pOAOL-DQRBWfkVZIWYVoy0mMQf6_UutNlOpEpGkT_nz3b1n7ZbpikPgtXMhMsjXNY0q73sB2DyQcgmKUxZFQtw.jpg',
      'saleNum': '3.2万'
    },
    {
      'price': 109.00,
      'title': '附近新开业的，作为江西人当然要去试试。点了几个家常菜。',
      'shop': '辣评新开江西菜',
      'image': 'https://qcloud.dpfile.com/pc/HePD48CFNnS0kMZyf3Q391wxaW_zVgHimctthH__J6UI54HLPUkNt5e3qtP4Nl2G_aW_B6sGElzX-tSmYRvRnQxxxek7cKy7_R0W-KdxWUk.jpg',
      'saleNum': '8764'
    },
  ];
  // 列表
  RxList dataList = [].obs;
  // 是否加载中
  RxBool isLoading = false.obs;
  RxBool isInitLoading = true.obs;
  RxBool hasMore = true.obs;

  //
  RxInt currentIndex = 0.obs;
  TextEditingController textEditingController = TextEditingController();
  FocusNode focusNode = FocusNode();
  TabController? tabController;
  // 分类列表
  RxList<dynamic> tabList = <dynamic>[].obs;

  ///轮播图数据
  RxList<dynamic> swiperData = <dynamic>[].obs;
  late ScrollController scrollController = ScrollController();
  final PageController pageController = PageController();
  // 滚动位置
  double scrollOffset = 0;
  int page = 1;

  final NetworkUtils networkUtils = NetworkUtils();

  /// 初始化 Tab 分类
  Future<void> initTabs() async {
    page = 1;
    currentIndex.value = 0;
    isLoading.value = false;
    hasMore.value = true;
    dataList.value = [];
    isInitLoading.value = true;

    // 赋值 tab 数据
    final res = await Http.post(ShopApi.shopCategory, data: {
      'level': 1,
    });
    final data = res['data'] as List<dynamic>;
    tabList.value = data;
    // 如果之前有 controller，要先释放掉
    tabController?.dispose();
    tabController = TabController(
      initialIndex: 0,
      length: tabList.length,
      vsync: this,
    );
    if (tabList.isNotEmpty) {
      loadSwiperData();
      loadData(currentIndex.value);
    }
  }

  /// 加载swiper数据
  Future<void> loadSwiperData() async {
    final res = await Http.post(ShopApi.shopSwiperList, data: {
      'type': 1,
    });
    final data = res['data'];
    logger.w(res);
    swiperData.assignAll(data);
  }

  /// 切换数据
  Future<void> changeData(int index) async {
    dataList.clear();
    if (isLoading.value) return;
    isLoading.value = true;
    final res = await Http.post(ShopApi.shopList, data: {
      'size': 10,
      'current': page,
      'categoryId': tabList[index]['id'],
    });

    final data = res['data']['records'];
    final total = res['data']['total'];
    logger.w(res);
    if (dataList.length >= total) {
      hasMore.value = false;
      isLoading.value = false;
      return;
    }
    dataList.value = data;
    page += 1;
    isLoading.value = false;
    isInitLoading.value = false;
  }

  /// 加载pageview数据
  Future<void> loadData(int index) async {
    if (isLoading.value) return;
    isLoading.value = true;
    final res = await Http.post(ShopApi.shopList, data: {
      'size': 10,
      'current': page,
      'categoryId': tabList[index]['id'],
    });

    final data = res['data']['records'];
    final total = res['data']['total'];
    logger.w(res);
    if (dataList.length >= total) {
      hasMore.value = false;
      isLoading.value = false;
      return;
    }
    dataList.addAll(data);
    page += 1;
    logger.e(page);
    isLoading.value = false;
    isInitLoading.value = false;
  }

  @override
  void initState() {
    super.initState();
    scrollController.addListener(() {
      setState(() {
        scrollOffset = scrollController.offset;
      });
      if (scrollController.position.pixels == scrollController.position.maxScrollExtent) {
        debugPrint('[index]滚动到底部');
        if (!isLoading.value) {
          loadData(currentIndex.value);
        }
      }
    });
    // 监听网络恢复
    ever(
      networkUtils.isConnected,
      (status) {
        logger.e('商品首页当前网络状态:$status');
        if (status) {
          initTabs();
        }
      },
    );
    // 初始化加载
    initTabs();
  }

  @override
  void dispose() {
    scrollController.dispose();
    pageController.dispose();
    super.dispose();
  }

  // 瀑布流卡片
  Widget cardList(item) {
    if (item == null) {
      return Loading(
        title: '加载中',
      );
    }
    return GestureDetector(
      child: Container(
        clipBehavior: Clip.antiAlias,
        decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(15.0), boxShadow: [
          BoxShadow(
            color: Colors.black.withAlpha(5),
            offset: Offset(0.0, 1.0),
            blurRadius: 1.0,
            spreadRadius: 0.0,
          ),
        ]),
        child: Column(
          children: [
            NetworkOrAssetImage(
              imageUrl: '${item['pic']}',
              width: double.infinity,
              placeholderAsset: 'assets/images/wait_loading.png',
            ),
            Container(
              padding: EdgeInsets.symmetric(horizontal: 10.0, vertical: 5.0),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                spacing: 5.0,
                children: [
                  Text(
                    '${item['name']}',
                    style: TextStyle(fontSize: 14.0, height: 1.2),
                    maxLines: 2,
                    overflow: TextOverflow.ellipsis,
                  ),
                  Row(
                    spacing: 5.0,
                    children: [
                      Text.rich(
                        TextSpan(style: TextStyle(color: Colors.red, fontSize: 12.0, fontWeight: FontWeight.w700, fontFamily: 'Arial'), children: [
                          TextSpan(text: '¥'),
                          TextSpan(
                              text: '${item['price']}',
                              style: TextStyle(
                                fontSize: 16.0,
                              )),
                        ]),
                      ),
                      Text(
                        '已售${Utils.graceNumber(int.parse(item['sales'] ?? '0'))}件',
                        style: TextStyle(color: Colors.grey, fontSize: 10.0),
                      ),
                    ],
                  ),
                  Text(
                    '${item['storeName']}',
                    style: TextStyle(color: Colors.grey, fontSize: 12.0),
                  ),
                ],
              ),
            )
          ],
        ),
      ),
      onTap: () {
        // Get.toNamed('/goods', arguments: item['id']);
        Get.toNamed('/goods', arguments: {'goodsId': item['id']});
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        focusNode.unfocus();
      },
      child: Scaffold(
        body: ScrollConfiguration(
          behavior: CustomScrollBehavior().copyWith(scrollbars: false),
          child: RefreshIndicator(
            color: FStyle.primaryColor,
            onRefresh: () async {
              await initTabs();
            },
            child: CustomScrollView(
              scrollBehavior: CustomScrollBehavior().copyWith(scrollbars: false),
              controller: scrollController,
              slivers: [
                SliverAppBar(
                  backgroundColor: Colors.transparent,
                  foregroundColor: Colors.white,
                  pinned: true,
                  expandedHeight: 200.0,
                  titleSpacing: 10.0,
                  // 搜索框(高斯模糊背景)
                  title: ClipRRect(
                    borderRadius: BorderRadius.circular(30.0),
                    child: BackdropFilter(
                      filter: ImageFilter.blur(sigmaX: 10.0, sigmaY: 10.0),
                      child: Container(
                        height: 45.0,
                        decoration: BoxDecoration(
                          color: Colors.white.withAlpha(150),
                        ),
                        child: TextField(
                          focusNode: focusNode,
                          controller: textEditingController,
                          decoration: InputDecoration(
                              isDense: true,
                              hintText: "热销商品",
                              hintStyle: TextStyle(fontSize: 15.0),
                              prefixIcon: Icon(
                                Icons.search,
                                color: Colors.black38,
                                size: 21.0,
                              ),
                              suffixIcon: Container(
                                padding: EdgeInsets.only(right: 15.0),
                                child: Row(
                                  mainAxisSize: MainAxisSize.min,
                                  spacing: 10.0,
                                  children: [
                                    TextButton(
                                      onPressed: () {
                                        focusNode.unfocus();
                                        if (textEditingController.text.isNotEmpty) {
                                          // 去搜索结果页，支持带着搜索文字和搜索tab索引
                                          Get.toNamed(
                                            '/search-result',
                                            arguments: {'searchWords': textEditingController.text, 'tab': 1},
                                          );
                                        }
                                      },
                                      child: Text('搜索'),
                                    ),
                                  ],
                                ),
                              ),
                              contentPadding: EdgeInsets.symmetric(vertical: 0, horizontal: 10.0),
                              border: OutlineInputBorder(borderSide: BorderSide.none, borderRadius: BorderRadius.circular(30.0))),
                          cursorColor: Colors.black,
                          onSubmitted: (value) {
                            focusNode.unfocus();
                            if (value.isNotEmpty) {
                              // 去搜索结果页，支持带着搜索文字和搜索tab索引
                              Get.toNamed(
                                '/search-result',
                                arguments: {'searchWords': value, 'tab': 1},
                              );
                            }
                          },
                        ),
                      ),
                    ),
                  ),

                  // 自定义伸缩区域(轮播图)
                  flexibleSpace: Container(
                    decoration: BoxDecoration(
                      gradient: LinearGradient(
                        begin: Alignment.topLeft,
                        end: Alignment.bottomRight,
                        colors: [Color(0xFFFF5000), Color(0xFFfcaec4)],
                      ),
                    ),
                    child: FlexibleSpaceBar(
                      background: Obx(() {
                        // 如果数据为空，返回一个空容器或占位图
                        if (swiperData.isEmpty) return SizedBox.shrink();

                        return SizedBox(
                          width: double.infinity,
                          child: Swiper.children(
                            pagination: SwiperPagination(
                              builder: DotSwiperPaginationBuilder(
                                color: Colors.white70,
                                activeColor: Colors.white,
                                size: 6.0,
                                activeSize: 8.0,
                                space: 4.0,
                              ),
                            ),
                            indicatorLayout: PageIndicatorLayout.SCALE,
                            children: swiperData.map<Widget>((itm) {
                              return NetworkOrAssetImage(
                                imageUrl: itm['images'],
                                placeholderAsset: 'assets/images/bk.jpg',
                              );
                            }).toList(),
                          ),
                        );
                      }),
                    ),
                  ),
                ),

                // 分类
                SliverPersistentHeader(
                  pinned: false,
                  delegate: CustomStickyHeader(
                    child: PreferredSize(
                      preferredSize: Size.fromHeight(110.0),
                      child: Obx(
                        () {
                          return Container(
                            margin: EdgeInsets.all(10.0),
                            padding: EdgeInsets.symmetric(vertical: 10.0),
                            height: 110.0,
                            clipBehavior: Clip.antiAlias,
                            decoration: BoxDecoration(
                              color: Colors.white,
                              borderRadius: BorderRadius.circular(15.0),
                            ),
                            child: Column(
                              children: [
                                Expanded(
                                  child: PageView.builder(
                                    controller: pageController,
                                    itemCount: (tabList.length / 4).ceil(),
                                    itemBuilder: (context, pageIndex) {
                                      final start = pageIndex * 4;
                                      final end = (start + 4) > tabList.length ? tabList.length : (start + 4);
                                      final pageItems = tabList.sublist(start, end);
                                      return GridView.builder(
                                        shrinkWrap: true,
                                        padding: EdgeInsets.zero,
                                        physics: NeverScrollableScrollPhysics(),
                                        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                                          crossAxisCount: 4, // 一行
                                          mainAxisSpacing: 0, // 行间距
                                        ),
                                        itemCount: pageItems.length,
                                        itemBuilder: (BuildContext context, int index) {
                                          final citem = pageItems[index];
                                          return GestureDetector(
                                            behavior: HitTestBehavior.translucent,
                                            onTap: () {
                                              //切换index
                                              final globalIndex = start + index;
                                              logger.e(globalIndex);
                                              if (globalIndex != currentIndex.value) {
                                                currentIndex.value = globalIndex;
                                                page = 1;
                                                isLoading.value = false;
                                                changeData(globalIndex);
                                              }
                                            },
                                            child: Column(
                                              spacing: 3.0,
                                              children: [
                                                ClipOval(
                                                  child: NetworkOrAssetImage(
                                                    imageUrl: citem['icon'],
                                                    width: 30.0,
                                                    height: 30.0,
                                                    placeholderAsset: 'assets/images/wait_loading.png',
                                                  ),
                                                ),
                                                Text(citem['name']),
                                              ],
                                            ),
                                          );
                                        },
                                      );
                                    },
                                  ),
                                ),
                                // 数量够翻页才显示
                                CustomPageViewIndicator(
                                  controller: pageController,
                                  count: (tabList.length / 4).ceil(),
                                  color: Color(0xFFCECECE),
                                  activeColor: Color(0xFFFF5000),
                                ),
                              ],
                            ),
                          );
                        },
                      ),
                    ),
                  ),
                ),

                // 瀑布流列表
                SliverToBoxAdapter(
                  child: Obx(
                    () {
                      // if (isInitLoading.value) {
                      //   return Column(
                      //     children: [
                      //       RefreshProgressIndicator(
                      //         backgroundColor: Colors.white,
                      //         color: Color(0xFFFF5000),
                      //       ),
                      //     ],
                      //   );
                      // }
                      if (dataList.isEmpty) {
                        return EmptyTip();
                      }
                      return Container(
                        padding: EdgeInsets.all(10.0),
                        child: Column(
                          children: [
                            MasonryGridView.count(
                              shrinkWrap: true,
                              padding: EdgeInsets.zero,
                              physics: NeverScrollableScrollPhysics(),
                              crossAxisCount: 2,
                              mainAxisSpacing: 10.0,
                              crossAxisSpacing: 10.0,
                              itemCount: dataList.length,
                              itemBuilder: (BuildContext context, int index) {
                                return cardList(dataList[index]);
                              },
                            ),
                            Opacity(opacity: dataList.isNotEmpty && isLoading.value ? 1 : 0, child: Loading(title: 'loading...')),
                          ],
                        ),
                      );
                    },
                  ),
                ),
              ],
            ),
          ),
        ),
        // 返回顶部
        floatingActionButton: Backtop(controller: scrollController, offset: scrollOffset),
      ),
    );
  }
}