runable
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import 'package:flutter/material.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:mobile_scanner/mobile_scanner.dart';
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import '../providers/scanner_provider.dart';
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/// Widget that provides barcode scanning functionality using device camera
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class BarcodeScannerWidget extends ConsumerStatefulWidget {
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const BarcodeScannerWidget({super.key});
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@override
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ConsumerState<BarcodeScannerWidget> createState() => _BarcodeScannerWidgetState();
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}
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class _BarcodeScannerWidgetState extends ConsumerState<BarcodeScannerWidget>
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with WidgetsBindingObserver {
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late MobileScannerController _controller;
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bool _isStarted = false;
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String? _lastScannedCode;
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DateTime? _lastScanTime;
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bool _isTorchOn = false;
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@override
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void initState() {
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super.initState();
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WidgetsBinding.instance.addObserver(this);
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_controller = MobileScannerController(
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formats: [
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BarcodeFormat.code128,
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],
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facing: CameraFacing.back,
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torchEnabled: false,
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);
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_startScanner();
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}
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@override
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void dispose() {
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WidgetsBinding.instance.removeObserver(this);
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_controller.dispose();
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super.dispose();
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}
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@override
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void didChangeAppLifecycleState(AppLifecycleState state) {
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super.didChangeAppLifecycleState(state);
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switch (state) {
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case AppLifecycleState.paused:
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_stopScanner();
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break;
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case AppLifecycleState.resumed:
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_startScanner();
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break;
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case AppLifecycleState.detached:
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case AppLifecycleState.inactive:
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case AppLifecycleState.hidden:
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break;
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}
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}
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Future<void> _startScanner() async {
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if (!_isStarted && mounted) {
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try {
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await _controller.start();
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setState(() {
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_isStarted = true;
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});
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} catch (e) {
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debugPrint('Failed to start scanner: $e');
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}
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}
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}
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Future<void> _stopScanner() async {
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if (_isStarted) {
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try {
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await _controller.stop();
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setState(() {
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_isStarted = false;
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});
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} catch (e) {
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debugPrint('Failed to stop scanner: $e');
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}
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}
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}
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void _onBarcodeDetected(BarcodeCapture capture) {
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final List<Barcode> barcodes = capture.barcodes;
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if (barcodes.isNotEmpty) {
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final barcode = barcodes.first;
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final code = barcode.rawValue;
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if (code != null && code.isNotEmpty) {
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// Prevent duplicate scans within 2 seconds
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final now = DateTime.now();
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if (_lastScannedCode == code &&
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_lastScanTime != null &&
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now.difference(_lastScanTime!).inSeconds < 2) {
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return;
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}
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_lastScannedCode = code;
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_lastScanTime = now;
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// Update scanner provider with new barcode
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ref.read(scannerProvider.notifier).updateBarcode(code);
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// Provide haptic feedback
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_provideHapticFeedback();
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}
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}
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}
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void _provideHapticFeedback() {
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// Haptic feedback is handled by the system
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// You can add custom vibration here if needed
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}
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@override
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Widget build(BuildContext context) {
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return Container(
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decoration: BoxDecoration(
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color: Colors.black,
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borderRadius: BorderRadius.circular(0),
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),
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child: Stack(
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children: [
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// Camera View
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ClipRRect(
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borderRadius: BorderRadius.circular(0),
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child: MobileScanner(
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controller: _controller,
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onDetect: _onBarcodeDetected,
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),
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),
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// Overlay with scanner frame
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_buildScannerOverlay(context),
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// Control buttons
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_buildControlButtons(context),
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],
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),
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);
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}
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/// Build scanner overlay with frame and guidance
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Widget _buildScannerOverlay(BuildContext context) {
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return Container(
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decoration: const BoxDecoration(
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color: Colors.transparent,
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),
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child: Stack(
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children: [
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// Dark overlay with cutout
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Container(
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color: Colors.black.withOpacity(0.5),
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child: Center(
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child: Container(
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width: 250,
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height: 150,
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decoration: BoxDecoration(
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border: Border.all(
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color: Theme.of(context).colorScheme.primary,
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width: 2,
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),
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borderRadius: BorderRadius.circular(12),
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),
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child: ClipRRect(
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borderRadius: BorderRadius.circular(10),
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child: Container(
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color: Colors.transparent,
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),
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),
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),
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),
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),
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// Instructions
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Positioned(
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bottom: 60,
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left: 0,
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right: 0,
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child: Container(
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padding: const EdgeInsets.symmetric(horizontal: 32, vertical: 16),
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child: Text(
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'Position barcode within the frame',
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style: Theme.of(context).textTheme.bodyMedium?.copyWith(
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color: Colors.white,
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fontWeight: FontWeight.w500,
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),
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textAlign: TextAlign.center,
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),
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),
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),
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],
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),
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);
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}
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/// Build control buttons (torch, camera switch)
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Widget _buildControlButtons(BuildContext context) {
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return Positioned(
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top: 16,
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right: 16,
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child: Column(
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children: [
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// Torch Toggle
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Container(
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decoration: BoxDecoration(
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color: Colors.black.withOpacity(0.6),
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shape: BoxShape.circle,
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),
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child: IconButton(
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icon: Icon(
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_isTorchOn ? Icons.flash_on : Icons.flash_off,
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color: Colors.white,
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),
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onPressed: _toggleTorch,
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),
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),
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const SizedBox(height: 12),
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// Camera Switch
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Container(
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decoration: BoxDecoration(
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color: Colors.black.withOpacity(0.6),
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shape: BoxShape.circle,
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),
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child: IconButton(
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icon: const Icon(
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Icons.cameraswitch,
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color: Colors.white,
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),
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onPressed: _switchCamera,
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),
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),
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],
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),
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);
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}
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/// Build error widget when camera fails
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Widget _buildErrorWidget(MobileScannerException error) {
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return Container(
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color: Colors.black,
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child: Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Icon(
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Icons.camera_alt_outlined,
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size: 64,
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color: Theme.of(context).colorScheme.error,
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),
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const SizedBox(height: 16),
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Text(
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'Camera Error',
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style: Theme.of(context).textTheme.titleMedium?.copyWith(
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color: Colors.white,
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),
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),
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const SizedBox(height: 8),
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Padding(
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padding: const EdgeInsets.symmetric(horizontal: 32),
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child: Text(
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_getErrorMessage(error),
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style: Theme.of(context).textTheme.bodyMedium?.copyWith(
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color: Colors.white70,
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),
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textAlign: TextAlign.center,
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),
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),
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const SizedBox(height: 16),
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ElevatedButton(
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onPressed: _restartScanner,
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child: const Text('Retry'),
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),
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],
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),
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),
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);
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}
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/// Build placeholder while camera is loading
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Widget _buildPlaceholderWidget() {
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return Container(
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color: Colors.black,
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child: const Center(
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child: CircularProgressIndicator(
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color: Colors.white,
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),
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),
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);
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}
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/// Get user-friendly error message
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String _getErrorMessage(MobileScannerException error) {
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switch (error.errorCode) {
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case MobileScannerErrorCode.permissionDenied:
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return 'Camera permission is required to scan barcodes. Please enable camera access in settings.';
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case MobileScannerErrorCode.unsupported:
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return 'Your device does not support barcode scanning.';
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default:
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return 'Unable to access camera. Please check your device settings and try again.';
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}
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}
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/// Toggle torch/flashlight
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void _toggleTorch() async {
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try {
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await _controller.toggleTorch();
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setState(() {
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_isTorchOn = !_isTorchOn;
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});
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} catch (e) {
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debugPrint('Failed to toggle torch: $e');
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}
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}
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/// Switch between front and back camera
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void _switchCamera() async {
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try {
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await _controller.switchCamera();
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} catch (e) {
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debugPrint('Failed to switch camera: $e');
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}
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}
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/// Restart scanner after error
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void _restartScanner() async {
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try {
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await _controller.stop();
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await _controller.start();
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setState(() {
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_isStarted = true;
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});
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} catch (e) {
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debugPrint('Failed to restart scanner: $e');
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}
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}
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}
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