barcode_scanner_window.dart
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import 'dart:ui';
import 'package:flutter/material.dart';
import 'package:mobile_scanner/mobile_scanner.dart';
class BarcodeScannerWithScanWindow extends StatefulWidget {
const BarcodeScannerWithScanWindow({Key? key}) : super(key: key);
@override
_BarcodeScannerWithScanWindowState createState() =>
_BarcodeScannerWithScanWindowState();
}
class _BarcodeScannerWithScanWindowState
extends State<BarcodeScannerWithScanWindow> {
late MobileScannerController controller;
String? barcode;
@override
void initState() {
super.initState();
controller = MobileScannerController();
}
@override
Widget build(BuildContext context) {
final scanWindow = Rect.fromCenter(
center: MediaQuery.of(context).size.center(Offset.zero),
width: 200,
height: 200,
);
return Scaffold(
backgroundColor: Colors.black,
body: Builder(
builder: (context) {
return Stack(
children: [
MobileScanner(
scanWindow: scanWindow,
controller: controller,
onDetect: (barcode, _) => setState(() {
this.barcode = barcode.rawValue;
}),
),
CustomPaint(
painter: ScannerOverlay(scanWindow),
),
Align(
alignment: Alignment.bottomCenter,
child: Container(
alignment: Alignment.bottomCenter,
height: 100,
color: Colors.black.withOpacity(0.4),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Center(
child: SizedBox(
width: MediaQuery.of(context).size.width - 120,
height: 50,
child: FittedBox(
child: Text(
barcode ?? 'Scan something!',
overflow: TextOverflow.fade,
style: Theme.of(context)
.textTheme
.headline4!
.copyWith(color: Colors.white),
),
),
),
),
],
),
),
),
],
);
},
),
);
}
}
class ScannerOverlay extends CustomPainter {
ScannerOverlay(this.scanWindow);
final Rect scanWindow;
@override
void paint(Canvas canvas, Size size) {
final backgroundPath = Path()..addRect(Rect.largest);
final cutoutPath = Path()..addRect(scanWindow);
final backgroundPaint = Paint()
..color = Colors.black.withOpacity(0.5)
..style = PaintingStyle.fill
..blendMode = BlendMode.dstOut;
final backgroundWithCutout = Path.combine(
PathOperation.difference,
backgroundPath,
cutoutPath,
);
canvas.drawPath(backgroundWithCutout, backgroundPaint);
}
@override
bool shouldRepaint(covariant CustomPainter oldDelegate) {
return false;
}
}