nomo/lib/app/modules/node/widgets/node_list.dart

import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:flutter_sticky_header/flutter_sticky_header.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:get/get.dart';
import 'package:nomo/app/widgets/click_opacity.dart';
import 'package:nomo/config/theme/theme_extensions/theme_extension.dart';

import '../../../constants/assets.dart';
import '../controllers/node_controller.dart';

class NodeList extends StatefulWidget {
  final int tabIndex;

  const NodeList({super.key, required this.tabIndex});

  @override
  State<NodeList> createState() {
    return _NodeListState();
  }
}

class _NodeListState extends State<NodeList>
    with AutomaticKeepAliveClientMixin {
  @override
  bool get wantKeepAlive => true;

  // 获取 Controller
  NodeController get controller => Get.find<NodeController>();

  /// 获取国家的展开状态
  bool _getExpandedState(String countryCode) {
    return controller.getExpandedState(widget.tabIndex, countryCode);
  }

  /// 设置国家的展开状态
  void _setExpandedState(String countryCode, bool expanded) {
    setState(() {
      controller.setExpandedState(widget.tabIndex, countryCode, expanded);
    });
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);

    final data = {
      'Europe': [
        {
          'title': 'United Kingdom',
          'code': 'GB',
          'cities': [
            'London',
            'Edinburgh',
            'Cardiff',
            'Liverpool',
            'Manchester',
          ],
        },
        {
          'title': 'Italy',
          'code': 'IT',
          'cities': ['Rome', 'Milan', 'Naples', 'Turin', 'Genoa'],
        },
        {
          'title': 'Germany',
          'code': 'DE',
          'cities': ['Berlin', 'Hamburg', 'Munich', 'Frankfurt', 'Cologne'],
        },
      ],
      'Asia': [
        {
          'title': 'China',
          'code': 'CN',
          'cities': ['Beijing', 'Shanghai', 'Guangzhou', 'Shenzhen', 'Chengdu'],
        },
        {
          'title': 'Japan',
          'code': 'JP',
          'cities': ['Tokyo', 'Osaka', 'Nagoya', 'Sapporo', 'Fukuoka'],
        },
        {
          'title': 'Korea',
          'code': 'KR',
          'cities': ['Seoul', 'Busan', 'Incheon', 'Daegu', 'Gwangju'],
        },
        {
          'title': 'India',
          'code': 'IN',
          'cities': ['Mumbai', 'Delhi', 'Bangalore', 'Chennai', 'Hyderabad'],
        },
      ],
      'America': [
        {
          'title': 'United States',
          'code': 'US',
          'cities': ['New York', 'Los Angeles', 'Chicago', 'Houston', 'Miami'],
        },
        {
          'title': 'Canada',
          'code': 'CA',
          'cities': ['Toronto', 'Montreal', 'Vancouver', 'Calgary', 'Edmonton'],
        },
        {
          'title': 'Mexico',
          'code': 'MX',
          'cities': [
            'Mexico City',
            'Guadalajara',
            'Monterrey',
            'Tijuana',
            'Puebla',
          ],
        },
        {
          'title': 'Brazil',
          'code': 'BR',
          'cities': [
            'Sao Paulo',
            'Rio de Janeiro',
            'Brasilia',
            'Salvador',
            'Fortaleza',
          ],
        },
      ],
    };
    return CustomScrollView(
      slivers: [
        for (var region in data.entries)
          SliverStickyHeader(
            header: Container(
              color: Get.reactiveTheme.scaffoldBackgroundColor,
              padding: const EdgeInsets.all(16),
              child: Text(
                region.key,
                style: TextStyle(
                  color: Get.reactiveTheme.hintColor,
                  fontSize: 16,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
            sliver: SliverList(
              delegate: SliverChildBuilderDelegate((context, i) {
                final country = region.value[i];
                final countryCode = country['code'] as String;
                final cities = country['cities'] as List<dynamic>;

                return _CountrySection(
                  title: country['title'] as String,
                  code: countryCode,
                  cities: cities,
                  // 传递展开状态
                  expanded: _getExpandedState(countryCode),
                  // 展开状态变化回调
                  onExpandedChanged: (expanded) {
                    _setExpandedState(countryCode, expanded);
                  },
                );
              }, childCount: region.value.length),
            ),
          ),
      ],
    );
  }
}

class _CountrySection extends StatelessWidget {
  final String title;
  final String code;
  final List<dynamic> cities;
  final bool expanded;
  final ValueChanged<bool> onExpandedChanged;

  const _CountrySection({
    required this.title,
    required this.code,
    required this.cities,
    required this.expanded,
    required this.onExpandedChanged,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
      decoration: BoxDecoration(
        color: Get.reactiveTheme.highlightColor,
        borderRadius: BorderRadius.circular(12),
      ),
      child: Column(
        children: [
          ClickOpacity(
            onTap: () => onExpandedChanged(!expanded),
            child: Container(
              height: 52.w,
              padding: EdgeInsets.symmetric(horizontal: 14.w),
              child: Row(
                children: [
                  // 国旗图标
                  ClipRRect(
                    borderRadius: BorderRadius.circular(4.r), // 设置圆角
                    child: SvgPicture.asset(
                      Assets.getCountryFlagImage(code),
                      width: 32.w,
                      height: 24.w,
                      fit: BoxFit.cover,
                      // placeholderBuilder: (context) => Container(
                      //   width: 32.w,
                      //   height: 24.w,
                      //   decoration: BoxDecoration(
                      //     borderRadius: BorderRadius.circular(4.r),
                      //     color: Colors.grey[200],
                      //   ),
                      //   alignment: Alignment.center,
                      //   child: Icon(
                      //     Icons.flag,
                      //     size: 16.w,
                      //     color: Colors.grey[400],
                      //   ),
                      // ),
                    ),
                  ),
                  10.horizontalSpace,
                  Text(
                    title,
                    style: TextStyle(
                      fontSize: 16.sp,
                      height: 1.5,
                      fontWeight: FontWeight.w500,
                      color: Get.reactiveTheme.textTheme.bodyLarge!.color,
                    ),
                  ),
                  const Spacer(),
                  // 箭头图标
                  AnimatedRotation(
                    turns: expanded ? 0.25 : 0.0,
                    duration: const Duration(milliseconds: 300),
                    child: Icon(
                      Icons.keyboard_arrow_right,
                      size: 20.w,
                      color: Get.reactiveTheme.hintColor,
                    ),
                  ),
                ],
              ),
            ),
          ),
          ClipRect(
            child: AnimatedAlign(
              duration: const Duration(milliseconds: 300),
              curve: Curves.easeInOut,
              heightFactor: expanded ? 1.0 : 0.0,
              alignment: Alignment.topLeft,
              child: AnimatedOpacity(
                opacity: expanded ? 1.0 : 0.0,
                duration: const Duration(milliseconds: 300),
                child: Column(
                  children: cities.map((city) {
                    final cityName = city as String;

                    return ClickOpacity(
                      onTap: () {},
                      child: Column(
                        children: [
                          Divider(
                            height: 1,
                            color: Get.reactiveTheme.dividerColor,
                          ),
                          Container(
                            alignment: Alignment.centerLeft,
                            margin: EdgeInsets.symmetric(
                              vertical: 12.h,
                              horizontal: 14.w,
                            ),
                            child: Text(
                              cityName,
                              style: TextStyle(
                                fontSize: 14.sp,
                                fontWeight: FontWeight.w500,
                                color: Get.reactiveTheme.hintColor,
                              ),
                            ),
                          ),
                        ],
                      ),
                    );
                  }).toList(),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}