Started working on Join Room Screen

Work already done:
- moving the New Room screen to a different endpoint
- fetching public rooms using the post API
- displaying public rooms

Suggestion for user interaction:
1. click on room
2. open bottomSheet with information and join button
3. click "join" to join room

lib/backend/request.dart

@@ -3,10 +3,8 @@ import 'dart:convert';
 import './resolve_url.dart';
 import './user.dart';
 
-enum Result {
-  ok,
-  err
-}
+enum Result { ok, err }
+
 class Response {
   final Map<String, dynamic> body;
   final Result res;
@@ -22,7 +20,8 @@ Future<Response> usePostApi(
   final resp = await http.post(Uri.parse('${target.base}api/$path'),
     headers: headers, body: jsonEncode({'data': body}));
   final json = jsonDecode(resp.body);
-  return Response(body: json, res: resp.statusCode==200?Result.ok:Result.err);
+  return Response(
+    body: json, res: resp.statusCode == 200 ? Result.ok : Result.err);
 }
 
 Future<Response> postWithCreadentials(

lib/main.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:outbag_app/backend/user.dart';
+import 'package:outbag_app/screens/room/join.dart';
 import 'package:outbag_app/screens/room/new.dart';
 import './screens/home.dart';
 import './screens/welcome.dart';
@@ -20,7 +21,8 @@ final routesUnauthorized = RouteMap(routes: {
 // routes when user is logged in
 final routesLoggedIn = RouteMap(routes: {
     '/': (_) => const MaterialPage(child: HomePage()),
-    '/new': (_) => const MaterialPage(child: NewRoomPage()),
+    '/new-room': (_) => const MaterialPage(child: NewRoomPage()),
+    '/add-room': (_) => const MaterialPage(child: JoinRoomPage()),
     '/r/:server/:tag/:page?': (info) => MaterialPage(
       child: RoomPage(info.pathParameters['server'] ?? "",
         info.pathParameters['tag'] ?? "",

lib/screens/home.dart

@@ -147,13 +147,13 @@ class _HomePageState extends State<HomePage> {
         },
       ),
       floatingActionButton: FloatingActionButton.extended(
-        label: const Text('New'),
+        label: const Text('Add Room'),
         icon: const Icon(Icons.add),
         onPressed: () {
           // create new room
-          Routemaster.of(context).push("/new");
+          Routemaster.of(context).push("/add-room");
         },
-        tooltip: 'Create Room',
+        tooltip: 'Add new Room',
       ),
     );
   }

lib/screens/room/join.dart

@@ -0,0 +1,108 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_svg/flutter_svg.dart';
+import 'package:outbag_app/backend/request.dart';
+import 'package:outbag_app/backend/room.dart';
+import 'package:outbag_app/backend/user.dart';
+import 'package:routemaster/routemaster.dart';
+
+class JoinRoomPage extends StatefulWidget {
+  const JoinRoomPage({super.key});
+
+  @override
+  State<StatefulWidget> createState() => _JoinRoomPageState();
+}
+
+class _JoinRoomPageState extends State {
+  List<Room> rooms = [];
+
+  @override
+  void initState() {
+    super.initState();
+    (() async {
+        User user;
+        try {
+          user = await User.fromDisk();
+        } catch (_) {
+          return;
+        }
+
+        try {
+          final resp = await postWithCreadentials(
+            path: 'listPublicRooms',
+            credentials: user,
+            target: user.server,
+            body: {});
+          if (resp.res == Result.ok) {
+            // parse rooms
+            final List<Room> list = resp.body['data'].map<Room>((json) {
+                return Room.fromJSON(json);
+            }).toList();
+            setState(() {
+                rooms = list;
+            });
+          } else {
+            throw Error();
+          }
+        } catch (_) {
+          // network error
+          // unable to load room list
+          // NOTE: might want to show snackbar
+          // with warning
+        }
+    })();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Join Room'),
+        leading: IconButton(
+          onPressed: () {
+            // go back
+            Routemaster.of(context).history.back();
+          },
+          icon: const Icon(Icons.arrow_back),
+          tooltip: "Go back",
+        ),
+      ),
+      body: ListView.builder(
+        itemCount: rooms.length,
+        itemBuilder: (ctx, i) {
+          final room = rooms[i];
+          return Card(
+            margin: const EdgeInsets.all(8.0),
+            clipBehavior: Clip.antiAliasWithSaveLayer,
+            semanticContainer: true,
+            child: InkWell(
+              onTap: () {
+                // TODO: show modalBottomSheet
+                // with room information
+                // and join button
+              },
+              child: Container(
+                padding: const EdgeInsets.fromLTRB(10, 5, 5, 10),
+                child: ListTile(
+                  title: Text(room.name),
+                  visualDensity: const VisualDensity(vertical: 3),
+                  subtitle: Text(room.description),
+                  leading: AspectRatio(
+                    aspectRatio: 1 / 1,
+                    child: SvgPicture.asset("${room.icon?.img}"),
+                  ),
+                  hoverColor: Colors.transparent,
+          ))));
+        },
+      ),
+      floatingActionButton: FloatingActionButton.extended(
+        label: const Text('New'),
+        icon: const Icon(Icons.add),
+        onPressed: () {
+          // create new room
+          Routemaster.of(context).push("/new-room");
+        },
+        tooltip: 'Create Room',
+      ),
+    );
+  }
+}