Can logout in tablet mode

lib/ui/widgets/tablet_mode/tablet_appbar_widget.dart

@@ -6,6 +6,7 @@ import 'package:comunic/ui/screens/notifications_screen.dart';
 import 'package:comunic/ui/screens/unread_conversations_screen.dart';
 import 'package:comunic/ui/widgets/safe_state.dart';
 import 'package:comunic/ui/widgets/tablet_mode/appbar_custom_dropdown_widget.dart';
+import 'package:comunic/utils/intl_utils.dart';
 import 'package:flutter/material.dart';
 
 /// Comunic tablet AppBar widget
@@ -80,8 +81,53 @@ class _ComunicTabletAppBarWidgetState
             child: UnreadConversationsScreen(),
           ),
         ),
-        PopupMenuButton(itemBuilder: (c) => []),
+        PopupMenuButton<_MenuItemCallback>(
+          offset: Offset(0, 50),
+          itemBuilder: (c) => [
+            _MainMenuItem(
+                label: tr("Sign out"),
+                icon: Icons.power_settings_new,
+                onTap: () => MainController.of(context).requestLogout()),
+          ],
+          onSelected: (v) => v(),
+        ),
       ],
     );
   }
 }
+
+typedef _MenuItemCallback = void Function();
+
+class _MainMenuItem extends PopupMenuEntry<_MenuItemCallback> {
+  final String label;
+  final IconData icon;
+  final _MenuItemCallback onTap;
+
+  const _MainMenuItem({
+    @required this.label,
+    @required this.icon,
+    @required this.onTap,
+  })  : assert(label != null),
+        assert(icon != null),
+        assert(onTap != null);
+
+  @override
+  __MainMenuItemState createState() => __MainMenuItemState();
+
+  @override
+  double get height => kMinInteractiveDimension;
+
+  @override
+  bool represents(_MenuItemCallback value) => onTap == value;
+}
+
+class __MainMenuItemState extends State<_MainMenuItem> {
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      leading: Icon(widget.icon),
+      title: Text(widget.label),
+      onTap: () => Navigator.of(context).pop(widget.onTap),
+    );
+  }
+}