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feat: add basic ui elements for barcode overlay and scanner overlay, …
…update scanWindow via MobileScanner widget
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:mobile_scanner/mobile_scanner.dart'; | ||
|
|
||
| class BarcodeOverlay extends StatelessWidget { | ||
| const BarcodeOverlay({ | ||
| super.key, | ||
| required this.controller, | ||
| required this.boxFit, | ||
| }); | ||
|
|
||
| final MobileScannerController controller; | ||
| final BoxFit boxFit; | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return ValueListenableBuilder( | ||
| valueListenable: controller, | ||
| builder: (context, value, child) { | ||
| // Not ready. | ||
| if (!value.isInitialized || !value.isRunning || value.error != null) { | ||
| return const SizedBox(); | ||
| } | ||
|
|
||
| return StreamBuilder<BarcodeCapture>( | ||
| stream: controller.barcodes, | ||
| builder: (context, snapshot) { | ||
| final BarcodeCapture? barcodeCapture = snapshot.data; | ||
|
|
||
| // No barcode. | ||
| if (barcodeCapture == null || barcodeCapture.barcodes.isEmpty) { | ||
| return const SizedBox(); | ||
| } | ||
|
|
||
| final overlays = <Widget>[]; | ||
|
|
||
| for (final scannedBarcode in barcodeCapture.barcodes) { | ||
| // No barcode corners, or size, or no camera preview size. | ||
| if (value.size.isEmpty || | ||
| scannedBarcode.size.isEmpty || | ||
| scannedBarcode.corners.isEmpty) { | ||
| continue; | ||
| } | ||
|
|
||
| overlays.add( | ||
| CustomPaint( | ||
| painter: BarcodePainter( | ||
| barcodeCorners: scannedBarcode.corners, | ||
| barcodeSize: scannedBarcode.size, | ||
| boxFit: boxFit, | ||
| cameraPreviewSize: barcodeCapture.size, | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
|
|
||
| return Stack( | ||
| fit: StackFit.expand, | ||
| children: overlays, | ||
| ); | ||
| }, | ||
| ); | ||
| }, | ||
| ); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| import 'package:flutter/material.dart'; | ||
|
|
||
| class BarcodePainter extends CustomPainter { | ||
| BarcodePainter({ | ||
| required this.barcodeCorners, | ||
| required this.barcodeSize, | ||
| required this.boxFit, | ||
| required this.cameraPreviewSize, | ||
| }); | ||
|
|
||
| final List<Offset> barcodeCorners; | ||
| final Size barcodeSize; | ||
| final BoxFit boxFit; | ||
| final Size cameraPreviewSize; | ||
|
|
||
| @override | ||
| void paint(Canvas canvas, Size size) { | ||
| if (barcodeCorners.isEmpty || | ||
| barcodeSize.isEmpty || | ||
| cameraPreviewSize.isEmpty) { | ||
| return; | ||
| } | ||
|
|
||
| final adjustedSize = applyBoxFit(boxFit, cameraPreviewSize, size); | ||
|
|
||
| double verticalPadding = size.height - adjustedSize.destination.height; | ||
| double horizontalPadding = size.width - adjustedSize.destination.width; | ||
| if (verticalPadding > 0) { | ||
| verticalPadding = verticalPadding / 2; | ||
| } else { | ||
| verticalPadding = 0; | ||
| } | ||
|
|
||
| if (horizontalPadding > 0) { | ||
| horizontalPadding = horizontalPadding / 2; | ||
| } else { | ||
| horizontalPadding = 0; | ||
| } | ||
|
|
||
| final double ratioWidth; | ||
| final double ratioHeight; | ||
|
|
||
| ratioWidth = cameraPreviewSize.width / adjustedSize.destination.width; | ||
| ratioHeight = cameraPreviewSize.height / adjustedSize.destination.height; | ||
|
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| final List<Offset> adjustedOffset = [ | ||
| for (final offset in barcodeCorners) | ||
| Offset( | ||
| offset.dx / ratioWidth + horizontalPadding, | ||
| offset.dy / ratioHeight + verticalPadding, | ||
| ), | ||
| ]; | ||
|
|
||
| final cutoutPath = Path()..addPolygon(adjustedOffset, true); | ||
|
|
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| final backgroundPaint = Paint() | ||
| ..color = Colors.red.withOpacity(0.3) | ||
| ..style = PaintingStyle.fill; | ||
|
|
||
| canvas.drawPath(cutoutPath, backgroundPaint); | ||
| } | ||
|
|
||
| @override | ||
| bool shouldRepaint(covariant CustomPainter oldDelegate) { | ||
| return true; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:mobile_scanner/src/mobile_scanner_controller.dart'; | ||
| import 'package:mobile_scanner/src/overlay/scanner_painter.dart'; | ||
|
|
||
| class ScannerOverlay extends StatelessWidget { | ||
| final MobileScannerController controller; | ||
| final Rect scanWindow; | ||
|
|
||
| const ScannerOverlay({ | ||
| super.key, | ||
| required this.controller, | ||
| required this.scanWindow, | ||
| }); | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return ValueListenableBuilder( | ||
| valueListenable: controller, | ||
| builder: (context, value, child) { | ||
| // Not ready. | ||
| if (!value.isInitialized || | ||
| !value.isRunning || | ||
| value.error != null || | ||
| value.size.isEmpty) { | ||
| return const SizedBox(); | ||
| } | ||
|
|
||
| return CustomPaint( | ||
| size: value.size, | ||
| painter: ScannerPainter(scanWindow), | ||
| ); | ||
| }, | ||
| ); | ||
| } | ||
| } |
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