Fixes #1378 Update Talawa to give a meaningful message if the URL isn't available.

lib/services/database_mutation_functions.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:graphql_flutter/graphql_flutter.dart';
 import 'package:talawa/locator.dart';
@@ -37,7 +39,10 @@ class DataBaseMutationFunctions {
     if (exception.linkException != null) {
       debugPrint(exception.linkException.toString());
       if (showSnackBar) {
-        navigationService.showSnackBar("Server not running/wrong url");
+        Timer(const Duration(seconds: 2), () {
+          navigationService
+              .showTalawaErrorDialog("Server not running/wrong url");
+        });
       }
       return false;
     }

lib/services/navigation_service.dart

@@ -1,5 +1,8 @@
 import 'package:flutter/material.dart';
 
+import 'package:talawa/widgets/talawa_error_dialog.dart';
+import 'package:talawa/widgets/talawa_error_widget.dart';
+
 class NavigationService {
   GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
 
@@ -62,6 +65,31 @@ class NavigationService {
     );
   }
 
+  void showTalawaErrorWidget(
+    String errorMessage, {
+    Duration duration = const Duration(seconds: 2),
+  }) {
+    ScaffoldMessenger.of(navigatorKey.currentContext!).showSnackBar(SnackBar(
+      padding: EdgeInsets.zero,
+      content: TalawaErrorWidget(
+        errorMessage: errorMessage,
+      ),
+      // backgroundColor: Colors.grey,
+      backgroundColor: const Color.fromRGBO(65, 65, 66, 1),
+    ));
+  }
+
+  void showTalawaErrorDialog(String errorMessage) {
+    showDialog(
+      context: navigatorKey.currentContext!,
+      barrierColor: Colors.transparent,
+      barrierDismissible: false,
+      builder: (BuildContext context) {
+        return TalawaErrorDialog(errorMessage);
+      },
+    );
+  }
+
   void pop() {
     return navigatorKey.currentState!.pop();
   }

lib/view_model/pre_auth_view_models/set_url_view_model.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:hive/hive.dart';
 import 'package:qr_code_scanner/qr_code_scanner.dart';
+import 'package:qr_flutter/qr_flutter.dart';
 import 'package:talawa/locator.dart';
 import 'package:talawa/services/size_config.dart';
 import 'package:talawa/utils/validators.dart';
@@ -87,8 +88,10 @@ class SetUrlViewModel extends BaseModel {
         graphqlConfig.getOrgUrl();
         navigationService.pushScreen(navigateTo, arguments: argument);
       } else {
-        navigationService
-            .showSnackBar("URL doesn't exist/no connection please check");
+        // navigationService
+        //     .showSnackBar("URL doesn't exist/no connection please check");
+        navigationService.showTalawaErrorWidget(
+            "URL doesn't exist/no connection please check");
       }
     }
   }
@@ -165,9 +168,19 @@ class SetUrlViewModel extends BaseModel {
           graphqlConfig.getOrgUrl();
           Navigator.pop(navigationService.navigatorKey.currentContext!);
           navigationService.pushScreen('/selectOrg', arguments: orgId);
+        } on CameraException catch (e) {
+          debugPrint(e.toString());
+          navigationService.showTalawaErrorWidget("The Camera is not working");
+        } on QrEmbeddedImageException catch (e) {
+          debugPrint(e.toString());
+          navigationService.showTalawaErrorDialog("The QR is not Working");
+        } on QrUnsupportedVersionException catch (e) {
+          debugPrint(e.toString());
+          navigationService
+              .showTalawaErrorDialog("This QR version is not Supported.");
         } on Exception catch (e) {
-          print(e);
-          print('invalid app qr');
+          debugPrint(e.toString());
+          navigationService.showTalawaErrorWidget("This QR is not for the App");
         }
       }
     });

lib/widgets/organization_list.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:graphql_flutter/graphql_flutter.dart';
@@ -16,6 +18,7 @@ class OrganizationList extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     model.organizations = [];
+    int noOfRefetch = 0;
     return GraphQLProvider(
       client: ValueNotifier<GraphQLClient>(graphqlConfig.clientToQuery()),
       child: Query(
@@ -34,13 +37,15 @@ class OrganizationList extends StatelessWidget {
           if (result.hasException) {
             final isException = databaseFunctions.encounteredExceptionOrError(
               result.exception!,
-              showSnackBar: false,
+              showSnackBar: noOfRefetch == 0,
             );
             if (isException != null) {
               if (isException) {
                 refetch!();
+                noOfRefetch++;
               } else {
                 refetch!();
+                noOfRefetch++;
               }
             }
           } else {

lib/widgets/talawa_error_dialog.dart

@@ -0,0 +1,35 @@
+import 'package:auto_size_text/auto_size_text.dart';
+import 'package:flutter/material.dart';
+
+class TalawaErrorDialog extends StatelessWidget {
+  const TalawaErrorDialog(this.errorMessage, {Key? key}) : super(key: key);
+  final String errorMessage;
+  @override
+  Widget build(BuildContext context) {
+    return SizedBox(
+      child: AlertDialog(
+        title: const Text(
+          "Error",
+          style: TextStyle(color: Colors.red),
+        ),
+        content: SizedBox(
+          width: 200,
+          height: 75,
+          child: AutoSizeText(
+            errorMessage,
+            style: const TextStyle(fontSize: 20),
+            maxLines: 3,
+          ),
+        ),
+        actions: <Widget>[
+          TextButton(
+            child: const Text('Close'),
+            onPressed: () {
+              Navigator.of(context).pop();
+            },
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/widgets/talawa_error_widget.dart

@@ -0,0 +1,40 @@
+import 'package:flutter/material.dart';
+
+class TalawaErrorWidget extends StatelessWidget {
+  const TalawaErrorWidget({Key? key, required this.errorMessage})
+      : super(key: key);
+  final String errorMessage;
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      children: [
+        Container(
+          width: 20,
+          height: 80,
+          decoration: const BoxDecoration(color: Colors.red),
+        ),
+        const SizedBox(
+          width: 10,
+        ),
+        const Icon(
+          Icons.error,
+          color: Colors.red,
+          size: 35,
+        ),
+        const SizedBox(
+          width: 10,
+        ),
+        Expanded(
+          flex: 1,
+          child: SingleChildScrollView(
+            scrollDirection: Axis.horizontal,
+            child: Text(
+              errorMessage,
+              style: const TextStyle(color: Colors.white),
+            ),
+          ),
+        )
+      ],
+    );
+  }
+}

pubspec.lock

@@ -29,6 +29,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.9.0"
+  auto_size_text:
+    dependency: "direct main"
+    description:
+      name: auto_size_text
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.0"
   boolean_selector:
     dependency: transitive
     description:

pubspec.yaml

@@ -14,6 +14,7 @@ environment:
   sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
+  auto_size_text: ^3.0.0
   cached_network_image: ^3.1.0
   connectivity_plus: ^2.3.1
   cupertino_icons: ^1.0.3

test/view_model_tests/pre_auth_view_models/set_url_view_model_test.dart

@@ -4,6 +4,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:hive/hive.dart';
 import 'package:mockito/mockito.dart';
 import 'package:qr_code_scanner/qr_code_scanner.dart';
+import 'package:qr_flutter/qr_flutter.dart';
 import 'package:talawa/locator.dart';
 import 'package:talawa/services/size_config.dart';
 import 'package:talawa/utils/validators.dart';
@@ -89,8 +90,8 @@ Future<void> main() async {
 
       await model.checkURLandNavigate('/', 'arguments');
 
-      verify(navigationService
-          .showSnackBar("URL doesn't exist/no connection please check"));
+      verify(navigationService.showTalawaErrorWidget(
+          "URL doesn't exist/no connection please check"));
     });
 
     testWidgets('Check if scanQR() is working fine', (tester) async {
@@ -123,7 +124,82 @@ Future<void> main() async {
           .onQRViewCreated(controller);
     });
 
-    testWidgets('Check if _onQRViewCreated() is working fine when throws',
+    testWidgets(
+        'Check if _onQRViewCreated() is working fine when throws CameraException',
+        (tester) async {
+      await tester.pumpWidget(
+        MaterialApp(
+          home: TestWidget(model),
+          navigatorKey: navigationService.navigatorKey,
+        ),
+      );
+
+      final controller = MockQRViewController();
+      when(controller.scannedDataStream).thenAnswer((_) async* {
+        yield Barcode('qr?orgId=1&scan', BarcodeFormat.qrcode, null);
+      });
+      // when(controller.stopCamera())
+      //     .thenThrow(Exception({"errorType": "error"}));
+
+      when(controller.stopCamera())
+          .thenThrow(CameraException("200", "cameraException"));
+      await tester.tap(find.byType(FloatingActionButton));
+      await tester.pump();
+
+      (tester.widget(find.byType(QRView)) as QRView)
+          .onQRViewCreated(controller);
+    });
+    testWidgets(
+        'Check if _onQRViewCreated() is working fine when throws QrEmbeddedImageException',
+        (tester) async {
+      await tester.pumpWidget(
+        MaterialApp(
+          home: TestWidget(model),
+          navigatorKey: navigationService.navigatorKey,
+        ),
+      );
+
+      final controller = MockQRViewController();
+      when(controller.scannedDataStream).thenAnswer((_) async* {
+        yield Barcode('qr?orgId=1&scan', BarcodeFormat.qrcode, null);
+      });
+      // when(controller.stopCamera())
+      //     .thenThrow(Exception({"errorType": "error"}));
+
+      when(controller.stopCamera())
+          .thenThrow(QrEmbeddedImageException("error"));
+      await tester.tap(find.byType(FloatingActionButton));
+      await tester.pump();
+
+      (tester.widget(find.byType(QRView)) as QRView)
+          .onQRViewCreated(controller);
+    });
+    testWidgets(
+        'Check if _onQRViewCreated() is working fine when throws QrUnsupportedVersionException',
+        (tester) async {
+      await tester.pumpWidget(
+        MaterialApp(
+          home: TestWidget(model),
+          navigatorKey: navigationService.navigatorKey,
+        ),
+      );
+
+      final controller = MockQRViewController();
+      when(controller.scannedDataStream).thenAnswer((_) async* {
+        yield Barcode('qr?orgId=1&scan', BarcodeFormat.qrcode, null);
+      });
+      // when(controller.stopCamera())
+      //     .thenThrow(Exception({"errorType": "error"}));
+
+      when(controller.stopCamera()).thenThrow(QrUnsupportedVersionException(0));
+      await tester.tap(find.byType(FloatingActionButton));
+      await tester.pump();
+
+      (tester.widget(find.byType(QRView)) as QRView)
+          .onQRViewCreated(controller);
+    });
+    testWidgets(
+        'Check if _onQRViewCreated() is working fine when throws Exception',
         (tester) async {
       await tester.pumpWidget(
         MaterialApp(
@@ -136,8 +212,10 @@ Future<void> main() async {
       when(controller.scannedDataStream).thenAnswer((_) async* {
         yield Barcode('qr?orgId=1&scan', BarcodeFormat.qrcode, null);
       });
-      when(controller.stopCamera()).thenThrow(Exception());
+      // when(controller.stopCamera())
+      //     .thenThrow(Exception({"errorType": "error"}));
 
+      when(controller.stopCamera()).thenThrow(Exception(0));
       await tester.tap(find.byType(FloatingActionButton));
       await tester.pump();
 

test/widget_tests/after_auth_screens/app_settings/app_setting_page_test.dart

@@ -1,16 +1,11 @@
-import 'dart:io';
-
 import 'package:flutter/material.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:hive/hive.dart';
 import 'package:mockito/mockito.dart';
 import 'package:provider/provider.dart';
 import 'package:talawa/constants/constants.dart';
 import 'package:talawa/constants/custom_theme.dart';
 import 'package:talawa/models/language/language_model.dart';
-import 'package:talawa/models/organization/org_info.dart';
-import 'package:talawa/models/user/user_info.dart';
 import 'package:talawa/router.dart' as router;
 import 'package:talawa/services/graphql_config.dart';
 import 'package:talawa/services/navigation_service.dart';
@@ -90,14 +85,14 @@ Future<void> main() async {
   locator<GraphqlConfig>().test();
   locator<SizeConfig>().test();
 
-  final Directory dir = Directory('temporaryPath');
-  Hive
-    ..init(dir.path)
-    ..registerAdapter(UserAdapter())
-    ..registerAdapter(OrgInfoAdapter());
-  await Hive.openBox<User>('currentUser');
-  await Hive.openBox<OrgInfo>('currentOrg');
-  await Hive.openBox('url');
+  // final Directory dir = Directory('temporaryPath');
+  // Hive
+  //   ..init(dir.path)
+  //   ..registerAdapter(UserAdapter())
+  //   ..registerAdapter(OrgInfoAdapter());
+  // await Hive.openBox<User>('currentUser');
+  // await Hive.openBox<OrgInfo>('currentOrg');
+  // await Hive.openBox('url');
   group('Setting Page Screen Widget Test in dark mode', () {
     testWidgets("Testing if Settings Screen shows up", (tester) async {
       await tester.pumpWidget(createChangePassScreenDark());

test/widget_tests/widgets/custom_alert_dialog_test.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_test/flutter_test.dart';
-// import 'package:talawa/locator.dart' as loc;
 import 'package:talawa/services/navigation_service.dart';
 import 'package:talawa/services/size_config.dart';
 import 'package:talawa/utils/app_localization.dart';