together_mobile/lib/screens/contact/contact_screen.dart

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:badges/badges.dart' as badges;

import 'package:together_mobile/common/constants.dart';
import 'package:together_mobile/models/apply_list_model.dart';
import 'package:together_mobile/models/init_get_it.dart';
import 'package:together_mobile/models/user_model.dart';
import 'package:together_mobile/screens/contact/components/friend_tile.dart';
import 'package:together_mobile/screens/contact/components/group_chat_tile.dart';

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

  @override
  State<ContactScreen> createState() => _ContactScreenState();
}

class _ContactScreenState extends State<ContactScreen> {
  final Map<String, bool> _shows = {
    'friendGroups': true,
    'allFriends': false,
    'groupChats': false
  };

  @override
  Widget build(BuildContext context) {
    // Create a localkey, use to generate the custom scroll view,
    // or there will be a error: "Duplicate GlobalKey detected in widget tree."
    // But when I wrap custom scroll view into the RefrashIndicator, the key isn't needed any more
    // const Key customScrollKey = ValueKey<String>('bottom-sliver-list');

    return Scaffold(
      appBar: AppBar(
        leading: Container(
          margin: const EdgeInsets.only(left: 8),
          child: getIt.get<UserProfile>().avatar.isEmpty
              ? const CircleAvatar(
                  backgroundImage: AssetImage('assets/images/user_2.png'),
                )
              : CircleAvatar(
                  backgroundImage: FileImage(
                    File(getIt.get<UserProfile>().avatar),
                  ),
                ),
        ),
        title: const Text('通讯录'),
        centerTitle: true,
        actions: [
          IconButton(
            onPressed: () {},
            icon: const Icon(Icons.search),
            splashRadius: 20,
          ),
          IconButton(
            onPressed: () {
              context.push('/contact/add');
            },
            icon: const Icon(Icons.person_add_alt_1),
            splashRadius: 20,
          ),
        ],
      ),
      body: RefreshIndicator(
        onRefresh: () async {
          await Future.delayed(const Duration(seconds: 2));
        },
        child: CustomScrollView(
          physics: const BouncingScrollPhysics(),
          // key: customScrollKey,
          slivers: [
            SliverFixedExtentList(
              delegate: SliverChildListDelegate(
                [
                  TextButton(
                    onPressed: () async {
                      // await getApplicantInfo(getIt.get<ApplyList>().applicantIds);
                      context.push('/contact/apply_list');
                    },
                    style: TextButton.styleFrom(
                      iconColor: Theme.of(context).textTheme.bodyLarge?.color,
                    ),
                    child: Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        badges.Badge(
                          badgeStyle: const badges.BadgeStyle(
                            badgeColor: kErrorColor,
                            elevation: 12,
                          ),
                          badgeContent: Text(
                            getIt.get<ApplyList>().count.toString(),
                            style: TextStyle(
                              fontSize: 11,
                              color:
                                  Theme.of(context).colorScheme.inversePrimary,
                            ),
                          ),
                          badgeAnimation: const badges.BadgeAnimation.scale(),
                          position:
                              badges.BadgePosition.topEnd(top: -12, end: -15),
                          child: Text(
                            '添加申请',
                            style: TextStyle(
                              fontSize: 16,
                              color:
                                  Theme.of(context).textTheme.bodyLarge?.color,
                            ),
                          ),
                        ),
                        const Icon(
                          Icons.keyboard_arrow_right,
                          size: 30,
                        ),
                      ],
                    ),
                  ),
                  TextButton(
                    onPressed: () {
                      context.push('/contact/friend_group');
                    },
                    style: TextButton.styleFrom(
                      iconColor: Theme.of(context).textTheme.bodyLarge?.color,
                    ),
                    child: Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        Text(
                          '分组管理',
                          style: TextStyle(
                            fontSize: 16,
                            color: Theme.of(context).textTheme.bodyLarge?.color,
                          ),
                        ),
                        const Icon(
                          Icons.keyboard_arrow_right,
                          size: 30,
                        ),
                      ],
                    ),
                  ),
                ],
              ),
              itemExtent: 50.0,
            ),
            SliverPersistentHeader(
              delegate: _MySliverPersistentHeader(_shows, _change, _refresh),
              pinned: true,
            ),
            SliverList(
              delegate: SliverChildBuilderDelegate(
                (BuildContext context, int index) {
                  return const FriendTile();
                },
                childCount: 15,
              ),
            ),
          ],
        ),
      ),
    );
  }

  void _change(String which) {
    switch (which) {
      case 'friendGroups':
        setState(() {
          _shows['friendGroups'] = true;
          _shows['allFriends'] = false;
          _shows['groupChats'] = false;
        });
        break;
      case 'allFriends':
        setState(() {
          _shows['friendGroups'] = false;
          _shows['allFriends'] = true;
          _shows['groupChats'] = false;
        });
        break;
      case 'groupChats':
        setState(() {
          _shows['friendGroups'] = false;
          _shows['allFriends'] = false;
          _shows['groupChats'] = true;
        });
        break;
    }
  }

  void _refresh() {
    setState(() {});
  }
}

class _MySliverPersistentHeader extends SliverPersistentHeaderDelegate {
  const _MySliverPersistentHeader(this.shows, this.change, this.refresh);

  final Map<String, bool> shows;
  final Function(String) change;
  final VoidCallback refresh;

  @override
  double get minExtent => 50;

  @override
  double get maxExtent => 50;

  @override
  Widget build(
    BuildContext context,
    double shrinkOffset,
    bool overlapsContent,
  ) {
    return Container(
      height: 50,
      color: Theme.of(context).colorScheme.background,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          InkWell(
            onTap: () {
              change('friendGroups');
              refresh();
            },
            child: Container(
              margin: const EdgeInsets.only(left: 10),
              padding: const EdgeInsets.all(4),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(4),
                color: shows['friendGroups']!
                    ? kSecondaryColor.withOpacity(0.15)
                    : Theme.of(context).brightness == Brightness.light
                        ? null
                        : Theme.of(context).colorScheme.background,
              ),
              child: const Text('分组'),
            ),
          ),
          InkWell(
            onTap: () {
              change('allFriends');
            },
            child: Container(
              padding: const EdgeInsets.all(4),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(4),
                color: shows['allFriends']!
                    ? kSecondaryColor.withOpacity(0.15)
                    : Theme.of(context).brightness == Brightness.light
                        ? null
                        : Theme.of(context).colorScheme.background,
              ),
              child: const Text('全部好友'),
            ),
          ),
          InkWell(
            onTap: () {
              change('groupChats');
            },
            child: Container(
              margin: const EdgeInsets.only(right: 10),
              padding: const EdgeInsets.all(4),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(4),
                color: shows['groupChats']!
                    ? kSecondaryColor.withOpacity(0.15)
                    : Theme.of(context).brightness == Brightness.light
                        ? null
                        : Theme.of(context).colorScheme.background,
              ),
              child: const Text('群聊'),
            ),
          ),
        ],
      ),
    );
  }

  @override
  bool shouldRebuild(covariant _MySliverPersistentHeader oldDelegate) {
    return false;
  }
}