add pull to refresh to full post

lib/pages/full_post.dart

@@ -1,6 +1,7 @@
 import 'package:esys_flutter_share/esys_flutter_share.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:lemmy_api_client/lemmy_api_client.dart';
 
@@ -18,8 +19,10 @@ class FullPostPage extends HookWidget {
   final int id;
   final String instanceHost;
   final PostView post;
+  final GlobalKey<RefreshIndicatorState> _refreshIndicatorKey =
+      GlobalKey<RefreshIndicatorState>();
 
-  const FullPostPage({@required this.id, @required this.instanceHost})
+  FullPostPage({@required this.id, @required this.instanceHost})
       : assert(id != null),
         assert(instanceHost != null),
         post = null;
@@ -35,7 +38,7 @@ class FullPostPage extends HookWidget {
         .getPost(id: id, auth: accStore.defaultTokenFor(instanceHost)?.raw));
     final loggedInAction = useLoggedInAction(instanceHost);
     final newComments = useState(const <CommentView>[]);
-
+    final updatedPost = useState<FullPostView>(null);
     // FALLBACK VIEW
 
     if (!fullPostSnap.hasData && this.post == null) {
@@ -63,6 +66,21 @@ class FullPostPage extends HookWidget {
 
     // FUNCTIONS
 
+    refresh() async {
+      await HapticFeedback.mediumImpact();
+
+      try {
+        return await LemmyApi(instanceHost)
+            .v1
+            .getPost(id: id, auth: accStore.defaultTokenFor(instanceHost)?.raw);
+        // ignore: avoid_catches_without_on_clauses
+      } catch (e) {
+        Scaffold.of(context).showSnackBar(SnackBar(
+          content: Text(e.toString()),
+        ));
+      }
+    }
+
     sharePost() => Share.text('Share post', post.apId, 'text/plain');
 
     comment() async {
@@ -89,7 +107,10 @@ class FullPostPage extends HookWidget {
         floatingActionButton: FloatingActionButton(
             onPressed: loggedInAction((_) => comment()),
             child: const Icon(Icons.comment)),
-        body: ListView(
+        body: RefreshIndicator(
+          onRefresh: refresh,
+          key: _refreshIndicatorKey,
+          child: ListView(
             physics: const AlwaysScrollableScrollPhysics(),
             children: [
               Post(post, fullPost: true),
@@ -114,6 +135,7 @@ class FullPostPage extends HookWidget {
                   child: Center(child: CircularProgressIndicator()),
                 ),
             ],
+          ),
         ));
   }
 }