barcode_scanner_controller.dart
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import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:mobile_scanner/mobile_scanner.dart';
class BarcodeScannerWithController extends StatefulWidget {
const BarcodeScannerWithController({Key? key}) : super(key: key);
@override
_BarcodeScannerWithControllerState createState() =>
_BarcodeScannerWithControllerState();
}
class _BarcodeScannerWithControllerState
extends State<BarcodeScannerWithController>
with SingleTickerProviderStateMixin {
String? barcode;
MobileScannerController controller = MobileScannerController(
torchEnabled: true,
// formats: [BarcodeFormat.qrCode]
// facing: CameraFacing.front,
);
bool isStarted = true;
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
backgroundColor: Colors.black,
body: Builder(builder: (context) {
return Stack(
children: [
MobileScanner(
controller: controller,
fit: BoxFit.contain,
// controller: MobileScannerController(
// torchEnabled: true,
// facing: CameraFacing.front,
// ),
onDetect: (barcode, args) {
if (this.barcode != barcode.rawValue) {
setState(() {
this.barcode = barcode.rawValue;
});
}
}),
Align(
alignment: Alignment.bottomCenter,
child: Container(
alignment: Alignment.bottomCenter,
height: 100,
color: Colors.black.withOpacity(0.4),
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
IconButton(
color: Colors.white,
icon: ValueListenableBuilder(
valueListenable: controller.torchState,
builder: (context, state, child) {
switch (state as TorchState) {
case TorchState.off:
return const Icon(Icons.flash_off,
color: Colors.grey);
case TorchState.on:
return const Icon(Icons.flash_on,
color: Colors.yellow);
}
},
),
iconSize: 32.0,
onPressed: () => controller.toggleTorch(),
),
IconButton(
color: Colors.white,
icon: isStarted
? const Icon(Icons.stop)
: const Icon(Icons.play_arrow),
iconSize: 32.0,
onPressed: () => setState(() {
isStarted
? controller.stop()
: controller.start();
isStarted = !isStarted;
})),
Center(
child: SizedBox(
width: MediaQuery.of(context).size.width - 200,
height: 50,
child: FittedBox(
child: Text(
barcode ?? 'Scan something!',
overflow: TextOverflow.fade,
style: Theme.of(context)
.textTheme
.headline4!
.copyWith(color: Colors.white),
),
),
),
),
IconButton(
color: Colors.white,
icon: ValueListenableBuilder(
valueListenable: controller.cameraFacingState,
builder: (context, state, child) {
switch (state as CameraFacing) {
case CameraFacing.front:
return const Icon(Icons.camera_front);
case CameraFacing.back:
return const Icon(Icons.camera_rear);
}
},
),
iconSize: 32.0,
onPressed: () => controller.switchCamera(),
),
IconButton(
color: Colors.white,
icon: const Icon(Icons.image),
iconSize: 32.0,
onPressed: () async {
final ImagePicker _picker = ImagePicker();
// Pick an image
final XFile? image = await _picker.pickImage(
source: ImageSource.gallery);
if (image != null) {
if (await controller.analyzeImage(image.path)) {
ScaffoldMessenger.of(context)
.showSnackBar(const SnackBar(
content: Text('Barcode found!'),
backgroundColor: Colors.green,
));
} else {
ScaffoldMessenger.of(context)
.showSnackBar(const SnackBar(
content: Text('No barcode found!'),
backgroundColor: Colors.red,
));
}
}
},
),
],
),
),
),
],
);
}),
),
);
}
}