Added central user credentials management

lib/widget/debug/cacheView.dart

@@ -7,7 +7,7 @@ import 'package:flutter/services.dart';
 import 'package:jiffy/jiffy.dart';
 import 'package:localstore/localstore.dart';
 
-import '../../../widget/errorView.dart';
+import '../../../widget/placeholderView.dart';
 import 'jsonViewer.dart';
 
 class CacheView extends StatefulWidget {
@@ -93,7 +93,7 @@ class _CacheViewState extends State<CacheView> {
             );
           } else {
             return const Center(
-              child: ErrorView(icon: Icons.hourglass_empty, text: "Keine Daten"),
+              child: PlaceholderView(icon: Icons.hourglass_empty, text: "Keine Daten"),
             );
           }
         },

lib/widget/errorView.dart

@@ -1,31 +0,0 @@
-import 'package:flutter/material.dart';
-
-class ErrorView extends StatelessWidget {
-  final IconData icon;
-  final String text;
-  const ErrorView({Key? key, this.icon = Icons.report_gmailerrorred, this.text = "Es ist ein Fehler aufgetreten!"}) : super(key: key);
-
-  @override
-  Widget build(BuildContext context) {
-    return Center(
-      child: Container(
-        margin: const EdgeInsets.only(top: 100, left: 20, right: 20),
-        child: Column(
-          children: [
-            Container(
-              margin: const EdgeInsets.all(30),
-              child: Icon(icon, color: Colors.grey, size: 60),
-            ),
-            Text(text,
-              style: const TextStyle(
-                fontSize: 20,
-                color: Colors.grey,
-              ),
-              textAlign: TextAlign.center,
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}

lib/widget/placeholderView.dart

@@ -0,0 +1,34 @@
+import 'package:flutter/material.dart';
+
+class PlaceholderView extends StatelessWidget {
+  final IconData icon;
+  final String text;
+  const PlaceholderView({Key? key, required this.icon, required this.text}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return DefaultTextStyle(
+      style: const TextStyle(),
+      child: Center(
+        child: Container(
+          margin: const EdgeInsets.only(top: 100, left: 20, right: 20),
+          child: Column(
+            children: [
+              Container(
+                margin: const EdgeInsets.all(30),
+                child: Icon(icon, color: Colors.grey, size: 60),
+              ),
+              Text(text,
+                style: const TextStyle(
+                  fontSize: 20,
+                  color: Colors.grey,
+                ),
+                textAlign: TextAlign.center,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}