Added uniform loading indicator for all screens

lib/view/pages/files/files.dart

@@ -5,6 +5,7 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:loader_overlay/loader_overlay.dart';
 import 'package:marianum_mobile/storage/base/settingsProvider.dart';
+import 'package:marianum_mobile/widget/loadingSpinner.dart';
 import 'package:provider/provider.dart';
 
 import '../../../api/marianumcloud/webdav/queries/listFiles/cacheableFile.dart';
@@ -223,7 +224,7 @@ class _FilesState extends State<Files> {
         },
         child: const Icon(Icons.add),
       ),
-      body: data == null ? const Center(child: CircularProgressIndicator()) : data!.files.isEmpty ? const ErrorView(icon: Icons.folder_off_rounded, text: "Der Ordner ist leer") : LoaderOverlay(
+      body: data == null ? const LoadingSpinner() : data!.files.isEmpty ? const ErrorView(icon: Icons.folder_off_rounded, text: "Der Ordner ist leer") : LoaderOverlay(
         child: RefreshIndicator(
           onRefresh: () {
             _query();

lib/view/pages/more/message/message.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
+import 'package:marianum_mobile/widget/loadingSpinner.dart';
 import 'package:provider/provider.dart';
 
 import '../../../../api/mhsl/message/getMessages/getMessagesResponse.dart';
@@ -30,7 +31,7 @@ class _MessageState extends State<Message> {
         title: const Text("Marianum Message"),
       ),
       body: Consumer<MessageProps>(builder: (context, value, child) {
-        if(value.primaryLoading()) return const Center(child: CircularProgressIndicator());
+        if(value.primaryLoading()) return const LoadingSpinner();
 
         return RefreshIndicator(
           child: ListView.builder(

lib/view/pages/talk/chatList.dart

@@ -3,6 +3,7 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:marianum_mobile/api/marianumcloud/talk/createRoom/createRoomParams.dart';
 import 'package:marianum_mobile/widget/confirmDialog.dart';
+import 'package:marianum_mobile/widget/loadingSpinner.dart';
 import 'package:provider/provider.dart';
 
 import '../../../api/marianumcloud/talk/createRoom/createRoom.dart';
@@ -78,9 +79,7 @@ class _ChatListState extends State<ChatList> {
       body: Consumer<ChatListProps>(
         builder: (context, data, child) {
 
-          if(data.primaryLoading()) {
-            return const Center(child: CircularProgressIndicator());
-          }
+          if(data.primaryLoading()) return const LoadingSpinner();
 
           latestData = data;
 

lib/view/pages/talk/chatView.dart

@@ -2,6 +2,7 @@
 import 'package:flutter/material.dart';
 import 'package:jiffy/jiffy.dart';
 import 'package:loader_overlay/loader_overlay.dart';
+import 'package:marianum_mobile/widget/loadingSpinner.dart';
 import 'package:provider/provider.dart';
 
 import '../../../api/marianumcloud/talk/chat/getChatResponse.dart';
@@ -96,7 +97,7 @@ class _ChatViewState extends State<ChatView> {
               )
             ),
             child: LoaderOverlay(
-              child: data.primaryLoading() ? const Center(child: CircularProgressIndicator()) : Column(
+              child: data.primaryLoading() ? const LoadingSpinner() : Column(
                 children: [
                   Expanded(
                     child: ListView(

lib/view/pages/timetable/timetable.dart

@@ -2,6 +2,7 @@
 import 'dart:developer';
 
 import 'package:flutter/material.dart';
+import 'package:marianum_mobile/widget/loadingSpinner.dart';
 import 'package:provider/provider.dart';
 import 'package:syncfusion_flutter_calendar/calendar.dart';
 
@@ -62,7 +63,7 @@ class _TimetableState extends State<Timetable> {
       ),
       body: Consumer<TimetableProps>(
         builder: (context, value, child) {
-          if(value.primaryLoading()) return const Placeholder();
+          if(value.primaryLoading()) return const LoadingSpinner();
 
           GetHolidaysResponse holidays = value.getHolidaysResponse;
 

lib/widget/loadingSpinner.dart

@@ -1,4 +1,6 @@
 
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 
 class LoadingSpinner extends StatefulWidget {
@@ -9,21 +11,39 @@ class LoadingSpinner extends StatefulWidget {
 }
 
 class _LoadingSpinnerState extends State<LoadingSpinner> {
+  bool textVisible = false;
+  late Timer timer;
+
+  @override
+  void initState() {
+     timer = Timer(const Duration(seconds: 10), () {
+      setState(() {
+        textVisible = true;
+      });
+    });
+
+    super.initState();
+  }
+
   @override
   Widget build(BuildContext context) {
-    return Dialog(
-      child: Padding(
-        padding: const EdgeInsets.all(20),
-        child: Row(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            CircularProgressIndicator(
-              color: Theme.of(context).primaryColor,
-            ),
-            const Padding(padding: EdgeInsets.only(left: 15), child: Text("Daten abrufen...")),
-          ],
-        ),
+    return Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          const CircularProgressIndicator(),
+          Visibility(
+            visible: textVisible,
+            child: const Text("Bist du mit dem Internet verbunden?"),
+          ),
+        ],
       ),
     );
   }
+
+  @override
+  void dispose() {
+    timer.cancel();
+    super.dispose();
+  }
 }