imp: apply flutter_lints suggestions

analysis_options.yaml

@@ -1 +1 @@
-include: package:flutter_lints/flutter.dart
+include: package:flutter_lints/flutter.yaml

example/analysis_options.yaml

@@ -1 +1 @@
-include: package:flutter_lints/flutter.dart
+include: package:flutter_lints/flutter.yaml

example/lib/main.dart

@@ -5,7 +5,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:qr_code_scanner/qr_code_scanner.dart';
 
-void main() => runApp(MaterialApp(home: MyHome()));
+void main() => runApp(const MaterialApp(home: MyHome()));
 
 class MyHome extends StatelessWidget {
   const MyHome({Key? key}) : super(key: key);
@@ -13,15 +13,15 @@ class MyHome extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text('Flutter Demo Home Page')),
+      appBar: AppBar(title: const Text('Flutter Demo Home Page')),
       body: Center(
         child: ElevatedButton(
           onPressed: () {
             Navigator.of(context).push(MaterialPageRoute(
-              builder: (context) => QRViewExample(),
+              builder: (context) => const QRViewExample(),
             ));
           },
-          child: Text('qrView'),
+          child: const Text('qrView'),
         ),
       ),
     );
@@ -29,6 +29,8 @@ class MyHome extends StatelessWidget {
 }
 
 class QRViewExample extends StatefulWidget {
+  const QRViewExample({Key? key}) : super(key: key);
+
   @override
   State<StatefulWidget> createState() => _QRViewExampleState();
 }
@@ -66,13 +68,13 @@ class _QRViewExampleState extends State<QRViewExample> {
                     Text(
                         'Barcode Type: ${describeEnum(result!.format)}   Data: ${result!.code}')
                   else
-                    Text('Scan a code'),
+                    const Text('Scan a code'),
                   Row(
                     mainAxisAlignment: MainAxisAlignment.center,
                     crossAxisAlignment: CrossAxisAlignment.center,
                     children: <Widget>[
                       Container(
-                        margin: EdgeInsets.all(8),
+                        margin: const EdgeInsets.all(8),
                         child: ElevatedButton(
                             onPressed: () async {
                               await controller?.toggleFlash();
@@ -86,7 +88,7 @@ class _QRViewExampleState extends State<QRViewExample> {
                             )),
                       ),
                       Container(
-                        margin: EdgeInsets.all(8),
+                        margin: const EdgeInsets.all(8),
                         child: ElevatedButton(
                             onPressed: () async {
                               await controller?.flipCamera();
@@ -99,7 +101,7 @@ class _QRViewExampleState extends State<QRViewExample> {
                                   return Text(
                                       'Camera facing ${describeEnum(snapshot.data!)}');
                                 } else {
-                                  return Text('loading');
+                                  return const Text('loading');
                                 }
                               },
                             )),
@@ -111,21 +113,23 @@ class _QRViewExampleState extends State<QRViewExample> {
                     crossAxisAlignment: CrossAxisAlignment.center,
                     children: <Widget>[
                       Container(
-                        margin: EdgeInsets.all(8),
+                        margin: const EdgeInsets.all(8),
                         child: ElevatedButton(
                           onPressed: () async {
                             await controller?.pauseCamera();
                           },
-                          child: Text('pause', style: TextStyle(fontSize: 20)),
+                          child: const Text('pause',
+                              style: TextStyle(fontSize: 20)),
                         ),
                       ),
                       Container(
-                        margin: EdgeInsets.all(8),
+                        margin: const EdgeInsets.all(8),
                         child: ElevatedButton(
                           onPressed: () async {
                             await controller?.resumeCamera();
                           },
-                          child: Text('resume', style: TextStyle(fontSize: 20)),
+                          child: const Text('resume',
+                              style: TextStyle(fontSize: 20)),
                         ),
                       )
                     ],
@@ -175,7 +179,7 @@ class _QRViewExampleState extends State<QRViewExample> {
     log('${DateTime.now().toIso8601String()}_onPermissionSet $p');
     if (!p) {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('no Permission')),
+        const SnackBar(content: Text('no Permission')),
       );
     }
   }

lib/src/qr_code_scanner.dart

@@ -126,7 +126,7 @@ class _QRViewState extends State<QRView> {
             onPlatformViewCreated: _onPlatformViewCreated,
             creationParams:
                 _QrCameraSettings(cameraFacing: widget.cameraFacing).toMap(),
-            creationParamsCodec: StandardMessageCodec(),
+            creationParamsCodec: const StandardMessageCodec(),
           );
           break;
         case TargetPlatform.iOS:
@@ -135,7 +135,7 @@ class _QRViewState extends State<QRView> {
             onPlatformViewCreated: _onPlatformViewCreated,
             creationParams:
                 _QrCameraSettings(cameraFacing: widget.cameraFacing).toMap(),
-            creationParamsCodec: StandardMessageCodec(),
+            creationParamsCodec: const StandardMessageCodec(),
           );
           break;
         default:
@@ -327,7 +327,7 @@ class QRViewController {
       {QrScannerOverlayShape? overlay}) async {
     if (defaultTargetPlatform == TargetPlatform.iOS) {
       // Add small delay to ensure the render box is loaded
-      await Future.delayed(Duration(milliseconds: 300));
+      await Future.delayed(const Duration(milliseconds: 300));
       if (key.currentContext == null) return false;
       final renderBox = key.currentContext!.findRenderObject() as RenderBox;
       try {

lib/src/web/flutter_qr_web.dart

@@ -1,3 +1,5 @@
+// ignore_for_file: avoid_web_libraries_in_flutter
+
 import 'dart:async';
 import 'dart:core';
 import 'dart:html' as html;
@@ -59,11 +61,11 @@ class _WebQrViewState extends State<WebQrView> {
 
   QRViewControllerWeb? _controller;
 
-  late Size _size = Size(0, 0);
+  late Size _size = const Size(0, 0);
   Timer? timer;
   String? code;
   String? _errorMsg;
-  var video;
+  html.VideoElement video = html.VideoElement();
   String viewID = 'QRVIEW-' + DateTime.now().millisecondsSinceEpoch.toString();
 
   final StreamController<Barcode> _scanUpdateController =
@@ -78,13 +80,13 @@ class _WebQrViewState extends State<WebQrView> {
 
     facing = widget.cameraFacing ?? CameraFacing.front;
 
-    video = html.VideoElement();
+    // video = html.VideoElement();
     WebQrView.vidDiv.children = [video];
     // ignore: UNDEFINED_PREFIXED_NAME
     ui.platformViewRegistry
         .registerViewFactory(viewID, (int id) => WebQrView.vidDiv);
     // giving JavaScipt some time to process the DOM changes
-    Timer(Duration(milliseconds: 500), () {
+    Timer(const Duration(milliseconds: 500), () {
       start();
     });
   }
@@ -92,7 +94,8 @@ class _WebQrViewState extends State<WebQrView> {
   Future start() async {
     await _makeCall();
     _frameIntervall?.cancel();
-    _frameIntervall = Timer.periodic(Duration(milliseconds: 200), (timer) {
+    _frameIntervall =
+        Timer.periodic(const Duration(milliseconds: 200), (timer) {
       _captureFrame2();
     });
   }
@@ -202,7 +205,7 @@ class _WebQrViewState extends State<WebQrView> {
       return Center(child: Text(_errorMsg!));
     }
     if (_localStream == null) {
-      return Center(child: CircularProgressIndicator());
+      return const Center(child: CircularProgressIndicator());
     }
     return LayoutBuilder(
       builder: (context, constraints) {