Block empty fullscreen timetable

filcnaplo_premium/lib/ui/mobile/timetable/fs_timetable_button.dart

@@ -9,11 +9,15 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_feather_icons/flutter_feather_icons.dart';
 import 'package:provider/provider.dart';
+import 'package:filcnaplo_mobile_ui/pages/timetable/timetable_page.i18n.dart';
 
 class PremiumFSTimetableButton extends StatelessWidget {
-  const PremiumFSTimetableButton({Key? key, required this.controller}) : super(key: key);
+  const PremiumFSTimetableButton(
+      {Key? key, required this.controller, required this.tabcontroller})
+      : super(key: key);
 
   final TimetableController controller;
+  final TabController tabcontroller;
 
   @override
   Widget build(BuildContext context) {
@@ -22,19 +26,32 @@ class PremiumFSTimetableButton extends StatelessWidget {
       child: IconButton(
         splashRadius: 24.0,
         onPressed: () {
-          if (!Provider.of<PremiumProvider>(context, listen: false).hasScope(PremiumScopes.fsTimetable)) {
-            PremiumLockedFeatureUpsell.show(context: context, feature: PremiumFeature.weeklytimetable);
+          if (!Provider.of<PremiumProvider>(context, listen: false)
+              .hasScope(PremiumScopes.fsTimetable)) {
+            PremiumLockedFeatureUpsell.show(
+                context: context, feature: PremiumFeature.weeklytimetable);
+            return;
+          }
+
+          // If timetable empty, show empty
+          if (tabcontroller.length == 0) {
+            ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+              content: Text("empty_timetable".i18n),
+              duration: const Duration(seconds: 2),
+            ));
             return;
           }
 
           Navigator.of(context, rootNavigator: true)
               .push(PageRouteBuilder(
-            pageBuilder: (context, animation, secondaryAnimation) => PremiumFSTimetable(
+            pageBuilder: (context, animation, secondaryAnimation) =>
+                PremiumFSTimetable(
               controller: controller,
             ),
           ))
               .then((_) {
-            SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
+            SystemChrome.setPreferredOrientations(
+                [DeviceOrientation.portraitUp]);
             setSystemChrome(context);
           });
         },