ref(#59): use command pattern

lib/core/state/command.dart

@@ -0,0 +1,47 @@
+import 'package:async/async.dart';
+import 'package:flutter/material.dart';
+
+abstract class Command<T> extends ChangeNotifier {
+  Result<T>? _result;
+
+  bool _running = false;
+
+  Command();
+
+  bool get isError => result?.asError != null;
+
+  bool get isOk => result?.asValue != null;
+
+  Result<T>? get result => _result;
+
+  bool get running => _running;
+
+  Future<void> _execute(action) async {
+    if (running) return;
+
+    _result = null;
+    _running = true;
+    notifyListeners();
+
+    try {
+      _result = await action();
+    } catch (e) {
+      _result = Result.error(e);
+    } finally {
+    _running = false;
+      notifyListeners();
+    }
+  }
+}
+
+class Command0<T> extends Command<T> {
+  final Future<Result<T>> Function() action;
+
+  Command0(this.action);
+
+  Future<Result<T>> execute() async {
+    await _execute(action);
+
+    return _result!;
+  }
+}

lib/ui/register_account/view/RegisterAccount.dart

@@ -116,28 +116,46 @@ class _RegisterAccountState extends State<_RegisterAccount> {
 
   Widget _buildRegisterButton() {
     final viewModel = Provider.of<RegisterAccountViewModel>(context);
-    return SizedBox(
-      width: 291,
-      height: 64,
-      child: ElevatedButton(
-          onPressed: () async {
-            try {
-              await viewModel.register(context);
-              ScaffoldMessenger.of(context).showSnackBar(
-                const SnackBar(content: Text("Cadastro concluído com sucesso!")));
-            } catch(e) {
-              showDialog<Object>(
-                context: context,
-                builder: (BuildContext context) => ErrorPopUp(content: Text('$e')), 
-                //Ação ao clicar no botão de cadastro
-              );
-            }
-          },
-          child: Consumer<RegisterAccountViewModel>(
-            builder: (context, value, child) => value.isLoading
+
+    return ListenableBuilder(
+
+      listenable: viewModel.registercomand,
+      builder: (context, child) {
+        if (viewModel.registercomand.isError) {
+          WidgetsBinding.instance.addPostFrameCallback((_) {
+            showDialog<Object>(
+              context: context,
+              builder: (BuildContext context) => ErrorPopUp(
+                content: Text(
+                    viewModel.registercomand.result!.asError!.error.toString()),
+              ),
+            );
+          });
+        }
+
+        if (viewModel.registercomand.isOk) {
+          WidgetsBinding.instance.addPostFrameCallback((_) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              const SnackBar(
+                  content: Text(
+                      'conta criada com sucesso!!!')),
+            );
+          });
+        }
+
+        return SizedBox(
+          width: 291,
+          height: 64,
+          child: ElevatedButton(
+            onPressed: () async {
+              viewModel.registercomand.execute();
+            },
+            child: viewModel.registercomand.running
                 ? const CircularProgressIndicator(value: null)
                 : const Text('Registrar'),
-          )),
+          ),
+        );
+      },
     );
   }
 

lib/ui/register_account/viewModel/RegisterViewModel.dart

@@ -1,4 +1,5 @@
-import 'package:aranduapp/ui/shared/ErrorPopUp.dart';
+import 'package:aranduapp/core/state/command.dart';
+import 'package:async/async.dart';
 import 'package:flutter/material.dart';
 import '../model/RegisterRequest.dart';
 import '../service/RegisterService.dart';
@@ -12,42 +13,37 @@ class RegisterAccountViewModel extends ChangeNotifier {
 
   final TextEditingController confPasswordController = TextEditingController();
 
-  bool isLoading = false;
   bool isTermsAccepted = false;
 
-  void toggleTermsAccepted(bool value) {
-    isTermsAccepted = value;
-    notifyListeners();
+  late Command0<void> registercomand;
+
+  RegisterAccountViewModel() {
+    registercomand = Command0<void>(_register);
   }
 
-  Future<void> register(BuildContext context) async {
-    if (isLoading) return;
-    // Valida se os termos foram aceitos
+  Future<Result<void>> _register() async {
+
     if (!isTermsAccepted) {
-      throw Exception(
+      return Result.error(
           'Você deve aceitar os termos de privacidade e políticas de uso.');
     }
-    try {
-      isLoading = true;
-      notifyListeners();
-      // Valida os campos do formulário
-      if (!formKey.currentState!.validate()) {
-        throw Exception('Por favor, preencha todos os campos corretamente');
-      }
-      // Criação do objeto de requisição
-      final request = RegisterRequest(
-        email: emailController.text,
-        name: nameController.text,
-        userName: userNameController.text,
-        password: passwordController.text,
-      );
-      // Chamada do serviço de registro
-      await RegisterService.register(request);
-    } catch (e) {
-      rethrow;
-    } finally {
-      isLoading = false;
-      notifyListeners();
+
+    if (!formKey.currentState!.validate()) {
+      Result.error('Por favor, preencha todos os campos corretamente');
     }
+
+    await RegisterService.register(RegisterRequest(
+      email: emailController.text,
+      name: nameController.text,
+      userName: userNameController.text,
+      password: passwordController.text,
+    ));
+
+    return Result.value(null);
+  }
+
+  void toggleTermsAccepted(bool value) {
+    isTermsAccepted = value;
+    notifyListeners();
   }
 }

pubspec.lock

@@ -31,7 +31,7 @@ packages:
     source: hosted
     version: "2.6.0"
   async:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: async
       sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
@@ -577,7 +577,7 @@ packages:
     dependency: transitive
     description:
       name: path
-      sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
+      sha256: "087ce49c3f0dc39180befefc60fdb4acd8f8620e5682fe2476afd0b3688bb4af"
       url: "https://pub.dev"
     source: hosted
     version: "1.9.0"

pubspec.yaml

@@ -46,6 +46,7 @@ dependencies:
   flutter_secure_storage: ^9.2.2
   mockito: ^5.4.4
   build_runner: ^2.4.13
+  async: ^2.11.0
 
 
 dev_dependencies: