Add about dialog

lib/ui/routes/home_route.dart

@@ -90,6 +90,11 @@ class _HomeRouteState extends HomeController {
         _openAppSettings();
         break;
 
+      /// Show about dialog
+      case BarCallbackActions.OPEN_ABOUT_DIALOG:
+        showAboutAppDialog(context);
+        break;
+
       /// Logout user
       case BarCallbackActions.ACTION_LOGOUT:
         _logoutRequested();

lib/ui/widgets/navbar_widget.dart

@@ -18,6 +18,7 @@ enum BarCallbackActions {
   OPEN_GROUPS,
   OPEN_GROUP_PAGE,
   OPEN_APP_SETTINGS,
+  OPEN_ABOUT_DIALOG,
   NONE,
   ACTION_LOGOUT
 }
@@ -86,6 +87,8 @@ final _menuActionsItem = <_ActionMenuItem>[
   _ActionMenuItem(label: tr("Groups"), action: BarCallbackActions.OPEN_GROUPS),
   _ActionMenuItem(
       label: tr("App settings"), action: BarCallbackActions.OPEN_APP_SETTINGS),
+  _ActionMenuItem(
+      label: tr("About Comunic"), action: BarCallbackActions.OPEN_ABOUT_DIALOG),
   _ActionMenuItem(
       label: tr("Sign out"), action: BarCallbackActions.ACTION_LOGOUT),
 ];

lib/utils/ui_utils.dart

@@ -31,10 +31,9 @@ Widget buildLoadingPage({
 }
 
 /// Build and return an error card
-Widget buildErrorCard(String message, {List<Widget> actions, bool hide = false}) {
-
-  if(hide)
-    return Container();
+Widget buildErrorCard(String message,
+    {List<Widget> actions, bool hide = false}) {
+  if (hide) return Container();
 
   return Card(
     elevation: 2.0,
@@ -190,3 +189,23 @@ const darkerAccentColor = Colors.white30;
 
 /// Check out whether dark theme is enabled or not
 bool darkTheme() => preferences().getBool(PreferencesKeyList.ENABLE_DARK_THEME);
+
+/// Show about Comunic dialog
+void showAboutAppDialog(BuildContext context) {
+  showAboutDialog(
+      context: context,
+      applicationName: "Comunic",
+      children: <Widget>[
+        Text(
+          tr("Comunic is a free and OpenSource social network that respect your privacy."),
+          textAlign: TextAlign.center,
+        ),
+        SizedBox(
+          height: 20,
+        ),
+        Text(
+          "Application built by Pierre Hubert",
+          textAlign: TextAlign.center,
+        ),
+      ]);
+}