barcode_scanner_zoom.dart
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import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:mobile_scanner/mobile_scanner.dart';
import 'package:mobile_scanner_example/scanner_error_widget.dart';
class BarcodeScannerWithZoom extends StatefulWidget {
const BarcodeScannerWithZoom({super.key});
@override
State<BarcodeScannerWithZoom> createState() => _BarcodeScannerWithZoomState();
}
class _BarcodeScannerWithZoomState extends State<BarcodeScannerWithZoom>
with SingleTickerProviderStateMixin {
BarcodeCapture? barcode;
MobileScannerController controller = MobileScannerController(
torchEnabled: true,
);
bool isStarted = true;
double _zoomFactor = 0.0;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('With zoom slider')),
backgroundColor: Colors.black,
body: Builder(
builder: (context) {
return Stack(
children: [
MobileScanner(
controller: controller,
fit: BoxFit.contain,
errorBuilder: (context, error, child) {
return ScannerErrorWidget(error: error);
},
onDetect: (barcode) {
setState(() {
this.barcode = barcode;
});
},
),
Align(
alignment: Alignment.bottomCenter,
child: Container(
alignment: Alignment.bottomCenter,
height: 100,
color: Colors.black.withOpacity(0.4),
child: Column(
children: [
Slider(
value: _zoomFactor,
onChanged: (value) {
setState(() {
_zoomFactor = value;
controller.setZoomScale(value);
});
},
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
IconButton(
color: Colors.white,
icon: ValueListenableBuilder(
valueListenable: controller.torchState,
builder: (context, state, child) {
if (state == null) {
return const Icon(
Icons.flash_off,
color: Colors.grey,
);
}
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?.barcodes.first.rawValue ??
'Scan something!',
overflow: TextOverflow.fade,
style: Theme.of(context)
.textTheme
.headlineMedium!
.copyWith(color: Colors.white),
),
),
),
),
IconButton(
color: Colors.white,
icon: ValueListenableBuilder(
valueListenable: controller.cameraFacingState,
builder: (context, state, child) {
if (state == null) {
return const Icon(Icons.camera_front);
}
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)) {
if (!mounted) return;
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('Barcode found!'),
backgroundColor: Colors.green,
),
);
} else {
if (!mounted) return;
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('No barcode found!'),
backgroundColor: Colors.red,
),
);
}
}
},
),
],
),
],
),
),
),
],
);
},
),
);
}
}