Refactor InitialRoomsReceived to avoid extra bindables

osu.Game.Tests/Visual/Multiplayer/TestRoomManager.cs

@@ -18,7 +18,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
 
         public readonly BindableList<Room> Rooms = new BindableList<Room>();
 
-        public Bindable<bool> InitialRoomsReceived { get; } = new Bindable<bool>(true);
+        public IBindable<bool> InitialRoomsReceived { get; } = new Bindable<bool>(true);
 
         IBindableList<Room> IRoomManager.Rooms => Rooms;
 

osu.Game.Tests/Visual/Multiplayer/TestSceneMatchSettingsOverlay.cs

@@ -131,7 +131,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                 remove { }
             }
 
-            public Bindable<bool> InitialRoomsReceived { get; } = new Bindable<bool>(true);
+            public IBindable<bool> InitialRoomsReceived { get; } = new Bindable<bool>(true);
 
             public IBindableList<Room> Rooms => null;
 

osu.Game.Tests/Visual/Multiplayer/TestSceneMatchSubScreen.cs

@@ -151,7 +151,7 @@ namespace osu.Game.Tests.Visual.Multiplayer
                 remove => throw new NotImplementedException();
             }
 
-            public Bindable<bool> InitialRoomsReceived { get; } = new Bindable<bool>(true);
+            public IBindable<bool> InitialRoomsReceived { get; } = new Bindable<bool>(true);
 
             public IBindableList<Room> Rooms { get; } = new BindableList<Room>();
 

osu.Game/Screens/Multi/Components/ListingPollingComponent.cs

@@ -25,8 +25,7 @@ namespace osu.Game.Screens.Multi.Components
         {
             currentFilter.BindValueChanged(_ =>
             {
-                InitialRoomsReceived.Value = false;
-
+                NotifyRoomsReceived(null);
                 if (IsLoaded)
                     PollImmediately();
             });

osu.Game/Screens/Multi/Components/RoomManager.cs

@@ -23,7 +23,8 @@ namespace osu.Game.Screens.Multi.Components
 
         private readonly BindableList<Room> rooms = new BindableList<Room>();
 
-        public Bindable<bool> InitialRoomsReceived { get; } = new Bindable<bool>();
+        public IBindable<bool> InitialRoomsReceived => initialRoomsReceived;
+        private readonly Bindable<bool> initialRoomsReceived = new Bindable<bool>();
 
         public IBindableList<Room> Rooms => rooms;
 
@@ -44,7 +45,6 @@ namespace osu.Game.Screens.Multi.Components
 
             InternalChildren = CreatePollingComponents().Select(p =>
             {
-                p.InitialRoomsReceived.BindTo(InitialRoomsReceived);
                 p.RoomsReceived = onRoomsReceived;
                 return p;
             }).ToList();
@@ -122,6 +122,13 @@ namespace osu.Game.Screens.Multi.Components
 
         private void onRoomsReceived(List<Room> received)
         {
+            if (received == null)
+            {
+                rooms.Clear();
+                initialRoomsReceived.Value = false;
+                return;
+            }
+
             // Remove past matches
             foreach (var r in rooms.ToList())
             {
@@ -155,6 +162,7 @@ namespace osu.Game.Screens.Multi.Components
             }
 
             RoomsUpdated?.Invoke();
+            initialRoomsReceived.Value = true;
         }
 
         /// <summary>

osu.Game/Screens/Multi/Components/RoomPollingComponent.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using osu.Framework.Allocation;
-using osu.Framework.Bindables;
 using osu.Game.Online;
 using osu.Game.Online.API;
 using osu.Game.Online.Multiplayer;
@@ -13,17 +12,18 @@ namespace osu.Game.Screens.Multi.Components
 {
     public abstract class RoomPollingComponent : PollingComponent
     {
+        /// <summary>
+        /// Invoked when any <see cref="Room"/>s have been received from the API.
+        /// <para>
+        /// Any <see cref="Room"/>s present locally but not returned by this event are to be removed from display.
+        /// If null, the display of local rooms is reset to an initial state.
+        /// </para>
+        /// </summary>
         public Action<List<Room>> RoomsReceived;
 
-        public readonly Bindable<bool> InitialRoomsReceived = new Bindable<bool>();
-
         [Resolved]
         protected IAPIProvider API { get; private set; }
 
-        protected void NotifyRoomsReceived(List<Room> rooms)
-        {
-            InitialRoomsReceived.Value = true;
-            RoomsReceived?.Invoke(rooms);
-        }
+        protected void NotifyRoomsReceived(List<Room> rooms) => RoomsReceived?.Invoke(rooms);
     }
 }

osu.Game/Screens/Multi/IRoomManager.cs

@@ -19,7 +19,7 @@ namespace osu.Game.Screens.Multi
         /// <summary>
         /// Whether an initial listing of rooms has been received.
         /// </summary>
-        Bindable<bool> InitialRoomsReceived { get; }
+        IBindable<bool> InitialRoomsReceived { get; }
 
         /// <summary>
         /// All the active <see cref="Room"/>s.

osu.Game/Screens/Multi/Lounge/LoungeSubScreen.cs

@@ -27,7 +27,7 @@ namespace osu.Game.Screens.Multi.Lounge
 
         protected override UserActivity InitialActivity => new UserActivity.SearchingForLobby();
 
-        private readonly Bindable<bool> initialRoomsReceived = new Bindable<bool>();
+        private readonly IBindable<bool> initialRoomsReceived = new Bindable<bool>();
 
         private Container content;
         private LoadingLayer loadingLayer;