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:together_mobile/utils/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> {
  @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: Row(
            children: [
              const SizedBox(
                width: 8,
              ),
              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: () {
                        context.push('/contact/apply_list');
                      },
                      style: TextButton.styleFrom(
                        iconColor: Theme.of(context).textTheme.bodyLarge?.color,
                      ),
                      child: Row(
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: [
                          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,
              ),
              const SliverPersistentHeader(
                delegate: _MySliverPersistentHeader(),
                pinned: true,
              ),
              SliverList(
                delegate: SliverChildBuilderDelegate(
                  (
                    BuildContext context,
                    int index,
                  ) =>
                      const FriendTile(),
                  childCount: 15,
                ),
              ),
            ],
          ),
        ));
  }
}

class _MySliverPersistentHeader extends SliverPersistentHeaderDelegate {
  const _MySliverPersistentHeader();

  @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: [
          TextButton(
            onPressed: () {},
            child: Text(
              '分组',
              style: TextStyle(
                color: Theme.of(context).textTheme.bodyLarge?.color,
              ),
            ),
          ),
          TextButton(
            onPressed: () {},
            child: Text(
              '全部好友',
              style: TextStyle(
                color: Theme.of(context).textTheme.bodyLarge?.color,
              ),
            ),
          ),
          TextButton(
            onPressed: () {},
            child: Text(
              '群聊',
              style: TextStyle(
                color: Theme.of(context).textTheme.bodyLarge?.color,
              ),
            ),
          ),
        ],
      ),
    );
  }

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