user_screen.dart

import 'package:flutter/material.dart';
import 'package:qr_flutter/qr_flutter.dart';
import 'package:qr_code_scanner/qr_code_scanner.dart';

class UserScreen extends StatelessWidget {
  final String userId;

  UserScreen({required this.userId});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Userid $userId'),
      ),
      body: Center(
        child: QrImage(
          data: userId,
          version: QrVersions.auto,
          size: 200.0,
        ),
      ),
    );
  }
}

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

  @override
  _ScannerScreenState createState() => _ScannerScreenState();
}

class _ScannerScreenState extends State<ScannerScreen> {
  final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');
  late QRViewController controller;
  String? userId;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Scan QR Code'),
      ),
      body: QRView(
        key: qrKey,
        onQRViewCreated: _onQRViewCreated,
      ),
    );
  }

  void _onQRViewCreated(QRViewController controller) {
    this.controller = controller;
    controller.scannedDataStream.listen((scanData) {
      setState(() {
        userId = scanData.code;
      });
      controller.pauseCamera();
      // Use the userId to establish a connection with the other user
    });
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }
}