super_qr_code_scanner 1.0.2

super_qr_code_scanner: ^1.0.2 copied to clipboard

example/lib/main.dart

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

void main() {
  // Enable logging for debugging
  QRScannerLogger.setEnabled(true);
  QRScannerLogger.setLevel(LogLevel.info);
  
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Super QR Code Scanner Example',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.blue),
        useMaterial3: true,
      ),
      home: const QRScannerDemo(),
    );
  }
}

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

  @override
  State<QRScannerDemo> createState() => _QRScannerDemoState();
}

class _QRScannerDemoState extends State<QRScannerDemo> {
  final scanner = SuperQRCodeScanner();
  List<QRCode> results = [];
  bool isScanning = false;
  String? errorMessage;
  String selectedConfig = 'Default';

  @override
  void initState() {
    super.initState();
    // Initialize with default config
    scanner.updateConfig(QRScannerConfig.defaultConfig);
  }

  void _updateConfig(String config) {
    setState(() {
      selectedConfig = config;
    });
    
    switch (config) {
      case 'Fast':
        scanner.updateConfig(QRScannerConfig.fastConfig);
        break;
      case 'Accurate':
        scanner.updateConfig(QRScannerConfig.accurateConfig);
        break;
      default:
        scanner.updateConfig(QRScannerConfig.defaultConfig);
    }
    
    _showSnackBar('Configuration changed to $config');
  }

  Future<void> _scanSampleImage() async {
    setState(() {
      isScanning = true;
      errorMessage = null;
      results = [];
    });

    try {
      // In a real app, you would get the image path from:
      // - Image picker (gallery/camera)
      // - File picker
      // - Assets
      // - Network download
      // - etc.
      
      // For this example, we'll show how to use the API
      const sampleImagePath = '/path/to/your/qr/code/image.jpg';
      
      // Run scan in background to avoid blocking UI
      final qrCodes = await Future.microtask(
        () => scanner.scanImageFile(sampleImagePath),
      );

      setState(() {
        results = qrCodes;
        isScanning = false;
      });

      if (qrCodes.isEmpty) {
        _showSnackBar('No QR codes found in image');
      } else {
        _showSnackBar('Found ${qrCodes.length} QR code(s)');
      }
    } on InvalidParameterException catch (e) {
      setState(() {
        isScanning = false;
        errorMessage = 'Invalid input: ${e.message}';
      });
      _showSnackBar(errorMessage!);
    } on ImageProcessingException catch (e) {
      setState(() {
        isScanning = false;
        errorMessage = 'Processing failed: ${e.message}';
      });
      _showSnackBar(errorMessage!);
    } catch (e) {
      setState(() {
        isScanning = false;
        errorMessage = 'Error: $e';
      });
      _showSnackBar(errorMessage!);
    }
  }

  void _showSnackBar(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(message)),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: const Text('Super QR Code Scanner'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // Configuration selector
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    const Text(
                      'Configuration',
                      style: TextStyle(
                        fontSize: 18,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    const SizedBox(height: 12),
                    SegmentedButton<String>(
                      segments: const [
                        ButtonSegment(
                          value: 'Fast',
                          label: Text('Fast'),
                          icon: Icon(Icons.speed),
                        ),
                        ButtonSegment(
                          value: 'Default',
                          label: Text('Default'),
                          icon: Icon(Icons.balance),
                        ),
                        ButtonSegment(
                          value: 'Accurate',
                          label: Text('Accurate'),
                          icon: Icon(Icons.high_quality),
                        ),
                      ],
                      selected: {selectedConfig},
                      onSelectionChanged: (Set<String> selection) {
                        _updateConfig(selection.first);
                      },
                    ),
                  ],
                ),
              ),
            ),
            const SizedBox(height: 16),

            // Scan button
            ElevatedButton.icon(
              onPressed: isScanning ? null : _scanSampleImage,
              icon: isScanning
                  ? const SizedBox(
                      width: 20,
                      height: 20,
                      child: CircularProgressIndicator(strokeWidth: 2),
                    )
                  : const Icon(Icons.qr_code_scanner),
              label: Text(isScanning ? 'Scanning...' : 'Scan QR Code'),
              style: ElevatedButton.styleFrom(
                padding: const EdgeInsets.all(16),
              ),
            ),
            const SizedBox(height: 24),

            // Usage information
            const Card(
              child: Padding(
                padding: EdgeInsets.all(16.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Row(
                      children: [
                        Icon(Icons.info_outline, color: Colors.blue),
                        SizedBox(width: 8),
                        Text(
                          'How to use',
                          style: TextStyle(
                            fontSize: 16,
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                      ],
                    ),
                    SizedBox(height: 12),
                    Text(
                      '1. Get an image with QR codes using:\n'
                      '   • Image picker (camera/gallery)\n'
                      '   • File picker\n'
                      '   • Network download\n'
                      '   • App assets\n\n'
                      '2. Call scanner.scanImageFile(path)\n\n'
                      '3. Process the results',
                      style: TextStyle(fontSize: 14),
                    ),
                  ],
                ),
              ),
            ),
            const SizedBox(height: 16),

            // Results section
            if (results.isNotEmpty) ...[
              const Text(
                'Results:',
                style: TextStyle(
                  fontSize: 18,
                  fontWeight: FontWeight.bold,
                ),
              ),
              const SizedBox(height: 8),
              Expanded(
                child: ListView.builder(
                  itemCount: results.length,
                  itemBuilder: (context, index) {
                    final qr = results[index];
                    return Card(
                      child: ListTile(
                        leading: CircleAvatar(
                          child: Text('${index + 1}'),
                        ),
                        title: Text(
                          qr.content,
                          maxLines: 2,
                          overflow: TextOverflow.ellipsis,
                        ),
                        subtitle: Text('Format: ${qr.format}'),
                        trailing: IconButton(
                          icon: const Icon(Icons.copy),
                          onPressed: () {
                            // In a real app, copy to clipboard
                            _showSnackBar('Copied: ${qr.content}');
                          },
                        ),
                      ),
                    );
                  },
                ),
              ),
            ] else if (errorMessage != null)
              Card(
                color: Colors.red.shade50,
                child: Padding(
                  padding: const EdgeInsets.all(16.0),
                  child: Row(
                    children: [
                      const Icon(Icons.error_outline, color: Colors.red),
                      const SizedBox(width: 12),
                      Expanded(
                        child: Text(
                          errorMessage!,
                          style: const TextStyle(color: Colors.red),
                        ),
                      ),
                    ],
                  ),
                ),
              )
            else
              const Expanded(
                child: Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Icon(
                        Icons.qr_code_2,
                        size: 64,
                        color: Colors.grey,
                      ),
                      SizedBox(height: 16),
                      Text(
                        'No results yet',
                        style: TextStyle(
                          fontSize: 16,
                          color: Colors.grey,
                        ),
                      ),
                      SizedBox(height: 8),
                      Text(
                        'Scan an image to see QR codes',
                        style: TextStyle(
                          fontSize: 14,
                          color: Colors.grey,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
          ],
        ),
      ),
    );
  }
}