barcode_scanner_controller.dart
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import 'dart:async';
import 'package:flutter/material.dart';
import 'package:mobile_scanner/mobile_scanner.dart';
import 'package:mobile_scanner_example/scanner_button_widgets.dart';
import 'package:mobile_scanner_example/scanner_error_widget.dart';
class BarcodeScannerWithController extends StatefulWidget {
const BarcodeScannerWithController({super.key});
@override
State<BarcodeScannerWithController> createState() =>
_BarcodeScannerWithControllerState();
}
class _BarcodeScannerWithControllerState
extends State<BarcodeScannerWithController>
with SingleTickerProviderStateMixin {
BarcodeCapture? barcode;
final MobileScannerController controller = MobileScannerController(
torchEnabled: true, useNewCameraSelector: true,
// formats: [BarcodeFormat.qrCode]
// facing: CameraFacing.front,
// detectionSpeed: DetectionSpeed.normal
// detectionTimeoutMs: 1000,
// returnImage: false,
);
StreamSubscription<Object?>? _barcodesSubscription;
@override
void initState() {
super.initState();
_barcodesSubscription = controller.barcodes.listen((event) {
if (!context.mounted) {
return;
}
setState(() {
barcode = event;
});
});
controller.start();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('With controller')),
backgroundColor: Colors.black,
body: Builder(
builder: (context) {
return Stack(
children: [
MobileScanner(
controller: controller,
errorBuilder: (context, error, child) {
return ScannerErrorWidget(error: error);
},
fit: BoxFit.contain,
),
Align(
alignment: Alignment.bottomCenter,
child: Container(
alignment: Alignment.bottomCenter,
height: 100,
color: Colors.black.withOpacity(0.4),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
ToggleFlashlightButton(controller: controller),
StartStopMobileScannerButton(controller: controller),
Center(
child: SizedBox(
width: MediaQuery.of(context).size.width - 200,
height: 50,
child: FittedBox(
child: Text(
barcode?.barcodes.first.rawValue ??
'Scan something!',
overflow: TextOverflow.fade,
style: Theme.of(context)
.textTheme
.headlineMedium!
.copyWith(color: Colors.white),
),
),
),
),
SwitchCameraButton(controller: controller),
AnalyzeImageFromGalleryButton(controller: controller),
],
),
),
),
],
);
},
),
);
}
@override
Future<void> dispose() async {
_barcodesSubscription?.cancel();
await controller.dispose();
super.dispose();
}
}