Added loading screen on init

lib/constants.dart

@@ -20,3 +20,5 @@ const String hashLink =
 
 const String dataLink =
     "https://raw.githubusercontent.com/kphanipavan/IIITB_Menu/menu_scraper/out.json";
+
+enum DataStatus { Loaded, Loading, NotFound }

lib/models/globalModel.dart

@@ -16,14 +16,14 @@ class GlobalModel extends ChangeNotifier {
   late Map<dynamic, dynamic> mainData;
   DateTime currentDate = DateTime.now();
   String menuTime = breakfast;
-  bool menuAvailable = false;
+  DataStatus menuAvailable = DataStatus.Loading;
 
   GlobalModel() {
     print("In constructor");
     GlobalModel.loadData().then((value) {
       mainData = value;
       if (this.mainData["dates"].keys.contains(this.date)) {
-        this.menuAvailable = true;
+        this.menuAvailable = DataStatus.Loaded;
       }
       // print(mainData);
       notifyListeners();
@@ -157,9 +157,9 @@ class GlobalModel extends ChangeNotifier {
 
   void isMenuAvailable() {
     if (this.mainData["dates"].keys.contains(this.date)) {
-      this.menuAvailable = true;
+      this.menuAvailable = DataStatus.Loaded;
     } else {
-      this.menuAvailable = false;
+      this.menuAvailable = DataStatus.NotFound;
     }
   }
 

lib/views/homePage.dart

@@ -96,7 +96,7 @@ class HomePage extends StatelessWidget {
               ),
               body: TabBarView(
                   controller: cont,
-                  children: data.menuAvailable
+                  children: data.menuAvailable != DataStatus.NotFound
                       ? const [
                           MenuListView(menuType: "bf"),
                           MenuListView(menuType: "ln"),

lib/views/menuListView.dart

@@ -1,6 +1,7 @@
 // ignore_for_file: unnecessary_this, file_names
 
 import 'package:flutter/material.dart';
+import 'package:iiitb_menu/constants.dart';
 import 'package:iiitb_menu/models/globalModel.dart';
 import 'package:iiitb_menu/widgets/itemCard.dart';
 import 'package:provider/provider.dart';
@@ -15,6 +16,11 @@ class MenuListView extends StatelessWidget {
       builder: (BuildContext context, GlobalModel data, Widget? child) {
         // print(data.date);
         // print(data.mainData["dates"][data.date]);
+        DataStatus dataStatus = data.menuAvailable;
+        if (dataStatus == DataStatus.Loading) {
+          return const Center(
+              child: Text("Loading...", style: TextStyle(fontSize: 40)));
+        }
         String menuIndex = data.mainData["dates"][data.date];
         return Column(
           children: [