barcode_qr_scanner 0.2.3

Flutter barkod ve QR kod okuma paketi. Android ML Kit ve iOS AVFoundation desteği, çoklu tarama ve tekrar filtresi.

example/lib/main.dart

import 'package:barcode_qr_scanner/barcode_qr_scanner.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';

void main() {
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Barcode QR Scanner Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
      ),
      home: const ScannerPage(),
    );
  }
}

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

  @override
  State<ScannerPage> createState() => _ScannerPageState();
}

class _ScannerPageState extends State<ScannerPage> {
  final _controller = CodeScannerController();
  final _scannedCodes = <ScanResult>[];
  ScanMode _scanMode = ScanMode.single;
  PermissionStatus? _cameraStatus;

  @override
  void initState() {
    super.initState();
    _checkPermission();
  }

  Future<void> _checkPermission() async {
    final status = await Permission.camera.status;
    setState(() => _cameraStatus = status);
  }

  Future<void> _requestPermission() async {
    final status = await Permission.camera.request();
    setState(() => _cameraStatus = status);
  }

  Future<void> _openSettings() async {
    await openAppSettings();
    await _checkPermission();
  }

  void _onDetect(ScanResult result) {
    setState(() => _scannedCodes.insert(0, result));
  }

  void _clearResults() {
    setState(_scannedCodes.clear);
    _controller.resetDuplicateFilter();
    _controller.resume();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Barkod / QR Tarayıcı'),
        actions: [
          if (_cameraStatus?.isGranted ?? false) ...[
            PopupMenuButton<ScanMode>(
              initialValue: _scanMode,
              onSelected: (mode) => setState(() => _scanMode = mode),
              itemBuilder: (context) => const [
                PopupMenuItem(
                  value: ScanMode.continuous,
                  child: Text('Çoklu tarama'),
                ),
                PopupMenuItem(
                  value: ScanMode.single,
                  child: Text('Tek tarama'),
                ),
              ],
            ),
            IconButton(
              icon: const Icon(Icons.flash_on),
              onPressed: () => _controller.toggleTorch(),
            ),
          ],
        ],
      ),
      body: _buildBody(),
    );
  }

  Widget _buildBody() {
    if (_cameraStatus == null) {
      return const Center(child: CircularProgressIndicator());
    }

    if (_cameraStatus!.isGranted) {
      return Column(
        children: [
          Expanded(
            flex: 3,
            child: Stack(
              children: [
                CodeScannerView(
                  controller: _controller,
                  scanMode: _scanMode,
                  duplicateFilter: DuplicateFilter.session,
                  onDetect: _onDetect,
                ),
                Positioned(
                  bottom: 16,
                  left: 16,
                  right: 16,
                  child: Text(
                    _scanMode == ScanMode.continuous
                        ? 'Çoklu mod: her kod bir kez okunur'
                        : 'Tek mod: ilk okumada durur',
                    textAlign: TextAlign.center,
                    style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                          color: Colors.white,
                          shadows: const [
                            Shadow(blurRadius: 8, color: Colors.black54),
                          ],
                        ),
                  ),
                ),
              ],
            ),
          ),
          Expanded(
            flex: 2,
            child: _buildResultList(),
          ),
        ],
      );
    }

    return _buildPermissionDenied();
  }

  Widget _buildResultList() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        Padding(
          padding: const EdgeInsets.fromLTRB(16, 12, 16, 8),
          child: Row(
            children: [
              Text(
                'Okunanlar (${_scannedCodes.length})',
                style: Theme.of(context).textTheme.titleMedium,
              ),
              const Spacer(),
              if (_scannedCodes.isNotEmpty)
                TextButton(
                  onPressed: _clearResults,
                  child: const Text('Temizle'),
                ),
            ],
          ),
        ),
        Expanded(
          child: _scannedCodes.isEmpty
              ? const Center(child: Text('Henüz kod okunmadı'))
              : ListView.builder(
                  itemCount: _scannedCodes.length,
                  itemBuilder: (context, index) {
                    final result = _scannedCodes[index];
                    return ListTile(
                      leading: const Icon(Icons.qr_code_scanner),
                      title: Text(result.rawValue),
                      subtitle: Text(result.format.name),
                    );
                  },
                ),
        ),
      ],
    );
  }

  Widget _buildPermissionDenied() {
    final permanentlyDenied = _cameraStatus!.isPermanentlyDenied;

    return Center(
      child: Padding(
        padding: const EdgeInsets.all(24),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            const Icon(Icons.camera_alt_outlined, size: 64),
            const SizedBox(height: 16),
            Text(
              permanentlyDenied
                  ? 'Kamera izni kalıcı olarak reddedildi.'
                  : 'Tarama için kamera izni gerekli.',
              textAlign: TextAlign.center,
              style: Theme.of(context).textTheme.titleMedium,
            ),
            const SizedBox(height: 24),
            FilledButton(
              onPressed: permanentlyDenied ? _openSettings : _requestPermission,
              child: Text(permanentlyDenied ? 'Ayarları Aç' : 'İzin Ver'),
            ),
          ],
        ),
      ),
    );
  }
}