Building A One To One/Group Chat Experience

import 'package:flutter/material.dart';
import 'package:cometchat_chat_uikit/cometchat_chat_uikit.dart';
import 'messages_screen.dart';
import 'cometchat_config.dart';
import 'dart:async';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'CometChat V6 UI Kit',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const Home(),
    );
  }
}

class Home extends StatelessWidget {
  const Home({super.key});

  Future<void> _initializeAndLogin() async {
    final settings = UIKitSettingsBuilder()
      ..subscriptionType = CometChatSubscriptionType.allUsers
      ..autoEstablishSocketConnection = true
      ..appId = CometChatConfig.appId
      ..region = CometChatConfig.region
      ..authKey = CometChatConfig.authKey;

    await CometChatUIKit.init(uiKitSettings: settings.build());
    await CometChatUIKit.login(
      'cometchat-uid-1',
      onSuccess: (_) => debugPrint('Login Successful'),
      onError: (err) => throw Exception('Login Failed: $err'),
    );
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<void>(
      future: _initializeAndLogin(),
      builder: (ctx, snap) {
        if (snap.connectionState != ConnectionState.done) {
          return const Scaffold(
            body: SafeArea(child: Center(child: CircularProgressIndicator())),
          );
        }
        if (snap.hasError) {
          return Scaffold(
            body: SafeArea(
              child: Center(child: Text('Error:\n${snap.error}', textAlign: TextAlign.center)),
            ),
          );
        }
        return const MessagesPage();
      },
    );
  }
}

class MessagesPage extends StatelessWidget {
  const MessagesPage({super.key});

  Future<User> fetchCometChatUser(String uid) async {
    final completer = Completer<User>();
    CometChat.getUser(
      uid,
      onSuccess: (user) => completer.complete(user),
      onError: (error) => completer.completeError(error),
    );
    return completer.future;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: FutureBuilder<User>(
          future: fetchCometChatUser("cometchat-uid-2"),
          builder: (context, snapshot) {
            if (snapshot.connectionState == ConnectionState.waiting) {
              return const Center(child: CircularProgressIndicator());
            } else if (snapshot.hasError) {
              return Center(child: Text("Error: ${snapshot.error}"));
            } else if (snapshot.hasData) {
              return MessagesScreen(user: snapshot.data!);
            } else {
              return const Center(child: Text("User not found"));
            }
          },
        ),
      ),
    );
  }
}

import 'package:flutter/material.dart';
import 'package:cometchat_chat_uikit/cometchat_chat_uikit.dart';

class MessagesScreen extends StatefulWidget {
  final User? user;
  final Group? group;

  const MessagesScreen({Key? key, this.user, this.group}) : super(key: key);

  @override
  State<MessagesScreen> createState() => _MessagesScreenState();
}

class _MessagesScreenState extends State<MessagesScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: CometChatMessageHeader(
        user: widget.user,
        group: widget.group,
      ),
      body: SafeArea(
        child: Column(
          children: [
            Expanded(
              child: CometChatMessageList(
                user: widget.user,
                group: widget.group,
              ),
            ),
            CometChatMessageComposer(
              user: widget.user,
              group: widget.group,
            ),
          ],
        ),
      ),
    );
  }
}