From 443e0b57c7aa722e035c8ecaf8363eeecb7c85ce Mon Sep 17 00:00:00 2001
From: ookami-kb <ookami.kb@gmail.com>
Date: Sat, 4 May 2024 22:55:45 +0200
Subject: [PATCH] fix: camera overlay rendering

---
 .../widgets/qr_scanner_background.dart        | 30 +++++++++++++------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/packages/espressocash_app/lib/features/qr_scanner/widgets/qr_scanner_background.dart b/packages/espressocash_app/lib/features/qr_scanner/widgets/qr_scanner_background.dart
index 9de5cc3ffa..5a196635ed 100644
--- a/packages/espressocash_app/lib/features/qr_scanner/widgets/qr_scanner_background.dart
+++ b/packages/espressocash_app/lib/features/qr_scanner/widgets/qr_scanner_background.dart
@@ -6,7 +6,7 @@ import 'package:flutter_svg/flutter_svg.dart';
 
 import '../../../gen/assets.gen.dart';
 
-class QrScannerBackground extends StatelessWidget {
+class QrScannerBackground extends StatefulWidget {
   const QrScannerBackground({
     super.key,
     required this.child,
@@ -14,6 +14,19 @@ class QrScannerBackground extends StatelessWidget {
 
   final Widget child;
 
+  @override
+  State<QrScannerBackground> createState() => _QrScannerBackgroundState();
+}
+
+class _QrScannerBackgroundState extends State<QrScannerBackground> {
+  late final Future<PictureInfo> _info;
+
+  @override
+  void initState() {
+    super.initState();
+    _info = _readFrame();
+  }
+
   Future<PictureInfo> _readFrame() async {
     final byteData = await rootBundle.load(Assets.images.qrFrame.path);
 
@@ -25,13 +38,10 @@ class QrScannerBackground extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) => FutureBuilder<PictureInfo?>(
-        future: _readFrame(),
-        builder: (context, frame) => CustomPaint(
-          foregroundPainter: _Painter(
-            frame: frame.data,
-            dimension: 350,
-          ),
-          child: child,
+        future: _info,
+        builder: (context, snapshot) => CustomPaint(
+          foregroundPainter: _Painter(frame: snapshot.data, dimension: 350),
+          child: widget.child,
         ),
       );
 }
@@ -91,5 +101,7 @@ class _Painter extends CustomPainter {
   }
 
   @override
-  bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
+  bool shouldRepaint(covariant _Painter oldDelegate) =>
+      oldDelegate.dimension != dimension ||
+      oldDelegate.frame?.size != frame?.size;
 }