Add the concept of IOnlineComponents, registered tot he API for handling state changes.

osu.Desktop.VisualTests/Tests/TestCaseChatDisplay.cs

@@ -45,7 +45,7 @@ namespace osu.Desktop.VisualTests.Tests
         {
             base.Reset();
 
-            if (api.State != APIAccess.APIState.Online)
+            if (api.State != APIState.Online)
                 api.OnStateChange += delegate { initializeChannels(); };
             else
                 initializeChannels();
@@ -65,7 +65,7 @@ namespace osu.Desktop.VisualTests.Tests
         {
             careChannels = new List<Channel>();
 
-            if (api.State != APIAccess.APIState.Online)
+            if (api.State != APIState.Online)
                 return;
 
             Add(flow = new FlowContainer

osu.Game/Online/API/APIAccess.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Concurrent;
+using System.Collections.Generic;
 using System.Net;
 using System.Threading;
 using osu.Framework;
@@ -65,6 +66,18 @@ namespace osu.Game.Online.API
             thread.Start();
         }
 
+        private List<IOnlineComponent> components = new List<IOnlineComponent>();
+
+        public void Register(IOnlineComponent component)
+        {
+            components.Add(component);
+        }
+
+        public void Unregister(IOnlineComponent component)
+        {
+            components.Remove(component);
+        }
+
         public string AccessToken => authentication.RequestAccessToken();
 
         /// <summary>
@@ -221,6 +234,7 @@ namespace osu.Game.Online.API
                         log.Add($@"We just went {newState}!");
                         Scheduler.Add(delegate
                         {
+                            components.ForEach(c => c.APIStateChanged(this, newState));
                             OnStateChange?.Invoke(oldState, newState);
                         });
                     }
@@ -237,29 +251,6 @@ namespace osu.Game.Online.API
 
         public delegate void StateChangeDelegate(APIState oldState, APIState newState);
 
-        public enum APIState
-        {
-            /// <summary>
-            /// We cannot login (not enough credentials).
-            /// </summary>
-            Offline,
-
-            /// <summary>
-            /// We are having connectivity issues.
-            /// </summary>
-            Failing,
-
-            /// <summary>
-            /// We are in the process of (re-)connecting.
-            /// </summary>
-            Connecting,
-
-            /// <summary>
-            /// We are online.
-            /// </summary>
-            Online
-        }
-
         private void flushQueue(bool failOldRequests = true)
         {
             var oldQueue = queue;
@@ -286,4 +277,27 @@ namespace osu.Game.Online.API
             Scheduler.Update();
         }
     }
+
+    public enum APIState
+    {
+        /// <summary>
+        /// We cannot login (not enough credentials).
+        /// </summary>
+        Offline,
+
+        /// <summary>
+        /// We are having connectivity issues.
+        /// </summary>
+        Failing,
+
+        /// <summary>
+        /// We are in the process of (re-)connecting.
+        /// </summary>
+        Connecting,
+
+        /// <summary>
+        /// We are online.
+        /// </summary>
+        Online
+    }
 }

osu.Game/Online/API/IOnlineComponent.cs

@@ -0,0 +1,16 @@
+//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace osu.Game.Online.API
+{
+    public interface IOnlineComponent
+    {
+        void APIStateChanged(APIAccess api, APIState state);
+    }
+}

osu.Game/osu.Game.csproj

@@ -69,6 +69,7 @@
     <Compile Include="Modes\Objects\HitObjectParser.cs" />
     <Compile Include="Modes\Score.cs" />
     <Compile Include="Modes\ScoreProcesssor.cs" />
+    <Compile Include="Online\API\IOnlineComponent.cs" />
     <Compile Include="Overlays\DragBar.cs" />
     <Compile Include="Overlays\MusicController.cs" />
     <Compile Include="Beatmaps\Beatmap.cs" />