Can sign out of the application

lib/ui/screens/menus_screen.dart

@@ -0,0 +1,66 @@
+import 'package:comunic/helpers/account_helper.dart';
+import 'package:comunic/ui/routes/login_route.dart';
+import 'package:comunic/ui/tiles/menu_tile.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:flutter/material.dart';
+
+/// Menu screen
+///
+/// @author Pierre HUBERT
+
+class MenuScreen extends StatelessWidget {
+  /// Ask the user if he really wants to sign out from the application
+  Future<void> _confirmSignOut(BuildContext context) async  {
+    final result = await showDialog<bool>(
+      context: context,
+      builder: (c) {
+        return AlertDialog(
+          title: Text(tr("Confirm sign out")),
+          content: Text(
+              tr("Do your really want to sign out from the application ?")),
+          actions: <Widget>[
+            FlatButton(
+              child: Text(tr("Cancel").toUpperCase()),
+              onPressed: () {
+                Navigator.pop(context, false);
+              },
+            ),
+            FlatButton(
+              child: Text(
+                tr("Sign out").toUpperCase(),
+                style: TextStyle(color: Colors.red),
+              ),
+              onPressed: () {
+                Navigator.pop(context, true);
+              },
+            ),
+          ],
+        );
+      },
+    );
+
+    if(result == null || !result)
+      return;
+
+    await AccountHelper().signOut();
+
+    Navigator.pushReplacement(context, MaterialPageRoute(builder: (c){
+      return LoginRoute();
+    }));
+
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView(
+      children: <Widget>[
+        MenuTile(
+          title: tr("Sign out"),
+          onTap: () {
+            _confirmSignOut(context);
+          },
+        )
+      ],
+    );
+  }
+}