Improve user access denied screen

lib/ui/screens/user_access_denied_screen.dart

@@ -5,8 +5,9 @@ import 'package:comunic/models/user.dart';
 import 'package:comunic/ui/routes/main_route/main_route.dart';
 import 'package:comunic/ui/widgets/FrienshipStatusWidget.dart';
 import 'package:comunic/ui/widgets/account_image_widget.dart';
+import 'package:comunic/ui/widgets/async_screen_widget.dart';
+import 'package:comunic/ui/widgets/safe_state.dart';
 import 'package:comunic/utils/intl_utils.dart';
-import 'package:comunic/utils/ui_utils.dart';
 import 'package:flutter/material.dart';
 
 /// User access denied screen
@@ -24,27 +25,16 @@ class UserAccessDeniedScreen extends StatefulWidget {
   _UserAccessDeniedScreenState createState() => _UserAccessDeniedScreenState();
 }
 
-class _UserAccessDeniedScreenState extends State<UserAccessDeniedScreen> {
+class _UserAccessDeniedScreenState extends SafeState<UserAccessDeniedScreen> {
   final UsersHelper usersHelper = UsersHelper();
   final FriendsHelper friendsHelper = FriendsHelper();
 
-  GlobalKey<RefreshIndicatorState> _refreshIndicatorKey =
-      GlobalKey<RefreshIndicatorState>();
+  final _key = GlobalKey<AsyncScreenWidgetState>();
 
   FriendStatus _status;
   User _user;
-  bool _error = false;
-
-  void setError(bool e) => setState(() => _error = e);
-
-  @override
-  void didChangeDependencies() {
-    super.didChangeDependencies();
-    refresh();
-  }
 
   Future<void> refresh() async {
-    try {
     final status = await friendsHelper.getFriendshipStatus(widget.userID);
     final user = await usersHelper.getSingleWithThrow(widget.userID);
 
@@ -55,47 +45,29 @@ class _UserAccessDeniedScreenState extends State<UserAccessDeniedScreen> {
       controller.openUserPage(widget.userID);
     }
 
-      setState(() {
     _status = status;
     _user = user;
-      });
-    } catch (e) {
-      setError(true);
-    }
   }
 
   @override
   Widget build(BuildContext context) {
-    if (!_error && _status == null) return buildLoadingPage(showAppBar: true);
-
-    return Scaffold(
-      appBar: AppBar(
-        title: Text(_error ? "Error" : _user.displayName),
-      ),
-      body: RefreshIndicator(
-        key: _refreshIndicatorKey,
-        onRefresh: refresh,
-        child: ListView.builder(
-          itemBuilder: (c, i) => _scrollBuild(),
-          itemCount: 1,
-        ),
-      ),
-    );
-  }
-
-  Widget _scrollBuild() {
-    if (_error) return _buildError();
-
-    return _buildPage();
-  }
-
-  Widget _buildError() {
-    return buildErrorCard("Could get information about your friendship!");
+    return AsyncScreenWidget(
+        key: _key,
+        onReload: refresh,
+        onBuild: _buildPage,
+        errorMessage: tr("Could not load friendship information!"));
   }
 
   Widget _buildPage() {
-    return Center(
+    final size = MediaQuery.of(context).size;
+    return Container(
+      constraints: BoxConstraints.loose(size),
+      child: SingleChildScrollView(
+        child: Padding(
+          padding: const EdgeInsets.all(8.0),
           child: Column(
+            crossAxisAlignment: CrossAxisAlignment.center,
+            mainAxisAlignment: MainAxisAlignment.center,
             children: <Widget>[
               AccountImageWidget(
                 user: _user,
@@ -108,10 +80,12 @@ class _UserAccessDeniedScreenState extends State<UserAccessDeniedScreen> {
               Text(tr("This account is private.")),
               FriendshipStatusWidget(
                 status: _status,
-            onFriendshipUpdated: () => _refreshIndicatorKey.currentState.show(),
+                onFriendshipUpdated: () => _key.currentState.refresh(),
               )
             ],
           ),
+        ),
+      ),
     );
   }
 }