Partial web app support

lib/utils/services/_tb_app_storage.dart

@@ -0,0 +1,3 @@
+import 'package:thingsboard_client/thingsboard_client.dart';
+
+TbStorage createAppStorage() => throw UnsupportedError('');

lib/utils/services/tb_app_storage.dart

@@ -0,0 +1,3 @@
+export '_tb_app_storage.dart'
+  if (dart.library.io) 'tb_secure_storage.dart'
+  if (dart.library.html) 'tb_web_local_storage.dart';

lib/utils/services/tb_secure_storage.dart

@@ -1,6 +1,8 @@
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:thingsboard_client/thingsboard_client.dart';
 
+TbStorage createAppStorage() => TbSecureStorage();
+
 class TbSecureStorage implements TbStorage {
 
   final flutterStorage = FlutterSecureStorage();

lib/utils/services/tb_web_local_storage.dart

@@ -0,0 +1,25 @@
+import 'package:thingsboard_client/thingsboard_client.dart';
+import 'dart:html';
+
+TbStorage createAppStorage() => TbWebLocalStorage();
+
+class TbWebLocalStorage implements TbStorage {
+
+  final Storage _localStorage = window.localStorage;
+
+  @override
+  Future<void> deleteItem(String key) async {
+    _localStorage.remove(key);
+  }
+
+  @override
+  Future<String?> getItem(String key) async {
+    return _localStorage[key];
+  }
+
+  @override
+  Future<void> setItem(String key, String value) async {
+    _localStorage[key] = value;
+  }
+
+}

lib/utils/ui/qr_code_scanner.dart

@@ -7,7 +7,7 @@ import 'package:qr_code_scanner/qr_code_scanner.dart';
 import 'package:thingsboard_app/core/context/tb_context.dart';
 import 'package:thingsboard_app/core/context/tb_context_widget.dart';
 
-class QrCodeScannerPage extends TbPageWidget<QrCodeScannerPage, _QrCodeScannerPageState> {
+class QrCodeScannerPage extends TbPageWidget {
 
   QrCodeScannerPage(TbContext tbContext) : super(tbContext);
 
@@ -16,7 +16,7 @@ class QrCodeScannerPage extends TbPageWidget<QrCodeScannerPage, _QrCodeScannerPa
 
 }
 
-class _QrCodeScannerPageState extends TbPageState<QrCodeScannerPage, _QrCodeScannerPageState> {
+class _QrCodeScannerPageState extends TbPageState<QrCodeScannerPage> {
 
   Timer? simulatedQrTimer;
   QRViewController? controller;