Merge branch 'master' into mod-overlay/extension-points

osu.Android.props

@@ -52,7 +52,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="ppy.osu.Game.Resources" Version="2022.417.0" />
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2022.415.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2022.419.0" />
   </ItemGroup>
   <ItemGroup Label="Transitive Dependencies">
     <!-- Realm needs to be directly referenced in all Xamarin projects, as it will not pull in its transitive dependencies otherwise. -->

osu.Desktop/Security/ElevatedPrivilegesChecker.cs

@@ -19,7 +19,7 @@ namespace osu.Desktop.Security
     public class ElevatedPrivilegesChecker : Component
     {
         [Resolved]
-        private NotificationOverlay notifications { get; set; }
+        private INotificationOverlay notifications { get; set; }
 
         private bool elevated;
 

osu.Desktop/Updater/SquirrelUpdateManager.cs

@@ -25,7 +25,7 @@ namespace osu.Desktop.Updater
     public class SquirrelUpdateManager : osu.Game.Updater.UpdateManager
     {
         private UpdateManager updateManager;
-        private NotificationOverlay notificationOverlay;
+        private INotificationOverlay notificationOverlay;
 
         public Task PrepareUpdateAsync() => UpdateManager.RestartAppWhenExited();
 
@@ -39,9 +39,9 @@ namespace osu.Desktop.Updater
         private readonly SquirrelLogger squirrelLogger = new SquirrelLogger();
 
         [BackgroundDependencyLoader]
-        private void load(NotificationOverlay notification)
+        private void load(INotificationOverlay notifications)
         {
-            notificationOverlay = notification;
+            notificationOverlay = notifications;
 
             SquirrelLocator.CurrentMutable.Register(() => squirrelLogger, typeof(ILogger));
         }

osu.Game.Rulesets.Osu.Tests/LegacyMainCirclePieceTest.cs

@@ -0,0 +1,108 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable enable
+
+using System;
+using System.Diagnostics;
+using System.Linq;
+using Moq;
+using NUnit.Framework;
+using osu.Framework.Graphics.OpenGL.Textures;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Textures;
+using osu.Framework.Testing;
+using osu.Game.Rulesets.Osu.Skinning.Legacy;
+using osu.Game.Skinning;
+using osu.Game.Tests.Visual;
+
+namespace osu.Game.Rulesets.Osu.Tests
+{
+    [HeadlessTest]
+    public class LegacyMainCirclePieceTest : OsuTestScene
+    {
+        private static readonly object?[][] texture_priority_cases =
+        {
+            // default priority lookup
+            new object?[]
+            {
+                // available textures
+                new[] { @"hitcircle", @"hitcircleoverlay" },
+                // priority lookup prefix
+                null,
+                // expected circle and overlay
+                @"hitcircle", @"hitcircleoverlay",
+            },
+            // custom priority lookup
+            new object?[]
+            {
+                new[] { @"hitcircle", @"hitcircleoverlay", @"sliderstartcircle", @"sliderstartcircleoverlay" },
+                @"sliderstartcircle",
+                @"sliderstartcircle", @"sliderstartcircleoverlay",
+            },
+            // when no sprites are available for the specified prefix, fall back to "hitcircle"/"hitcircleoverlay".
+            new object?[]
+            {
+                new[] { @"hitcircle", @"hitcircleoverlay" },
+                @"sliderstartcircle",
+                @"hitcircle", @"hitcircleoverlay",
+            },
+            // when a circle is available for the specified prefix but no overlay exists, no overlay is displayed.
+            new object?[]
+            {
+                new[] { @"hitcircle", @"hitcircleoverlay", @"sliderstartcircle" },
+                @"sliderstartcircle",
+                @"sliderstartcircle", null
+            },
+            // when no circle is available for the specified prefix but an overlay exists, the overlay is ignored.
+            new object?[]
+            {
+                new[] { @"hitcircle", @"hitcircleoverlay", @"sliderstartcircleoverlay" },
+                @"sliderstartcircle",
+                @"hitcircle", @"hitcircleoverlay",
+            }
+        };
+
+        [TestCaseSource(nameof(texture_priority_cases))]
+        public void TestTexturePriorities(string[] textureFilenames, string priorityLookup, string? expectedCircle, string? expectedOverlay)
+        {
+            TestLegacyMainCirclePiece piece = null!;
+
+            AddStep("load circle piece", () =>
+            {
+                var skin = new Mock<ISkinSource>();
+
+                // shouldn't be required as GetTexture(string) calls GetTexture(string, WrapMode, WrapMode) by default,
+                // but moq doesn't handle that well, therefore explicitly requiring to use `CallBase`:
+                // https://github.com/moq/moq4/issues/972
+                skin.Setup(s => s.GetTexture(It.IsAny<string>())).CallBase();
+
+                skin.Setup(s => s.GetTexture(It.IsIn(textureFilenames), It.IsAny<WrapMode>(), It.IsAny<WrapMode>()))
+                    .Returns((string componentName, WrapMode _, WrapMode __) => new Texture(1, 1) { AssetName = componentName });
+
+                Child = new DependencyProvidingContainer
+                {
+                    CachedDependencies = new (Type, object)[] { (typeof(ISkinSource), skin.Object) },
+                    Child = piece = new TestLegacyMainCirclePiece(priorityLookup),
+                };
+
+                var sprites = this.ChildrenOfType<Sprite>().Where(s => s.Texture.AssetName != null).DistinctBy(s => s.Texture.AssetName).ToArray();
+                Debug.Assert(sprites.Length <= 2);
+            });
+
+            AddAssert("check circle sprite", () => piece.CircleSprite?.Texture?.AssetName == expectedCircle);
+            AddAssert("check overlay sprite", () => piece.OverlaySprite?.Texture?.AssetName == expectedOverlay);
+        }
+
+        private class TestLegacyMainCirclePiece : LegacyMainCirclePiece
+        {
+            public new Sprite? CircleSprite => base.CircleSprite.ChildrenOfType<Sprite>().DistinctBy(s => s.Texture.AssetName).SingleOrDefault();
+            public new Sprite? OverlaySprite => base.OverlaySprite.ChildrenOfType<Sprite>().DistinctBy(s => s.Texture.AssetName).SingleOrDefault();
+
+            public TestLegacyMainCirclePiece(string? priorityLookupPrefix)
+                : base(priorityLookupPrefix, false)
+            {
+            }
+        }
+    }
+}

osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyMainCirclePiece.cs

@@ -3,10 +3,10 @@
 
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
+using osu.Framework.Extensions.ObjectExtensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
-using osu.Framework.Graphics.Textures;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
 using osu.Game.Rulesets.Objects.Drawables;
@@ -16,63 +16,61 @@ using osu.Game.Skinning;
 using osuTK;
 using osuTK.Graphics;
 
+#nullable enable
+
 namespace osu.Game.Rulesets.Osu.Skinning.Legacy
 {
     public class LegacyMainCirclePiece : CompositeDrawable
     {
         public override bool RemoveCompletedTransforms => false;
 
-        private readonly string priorityLookup;
+        /// <summary>
+        /// A prioritised prefix to perform texture lookups with.
+        /// </summary>
+        private readonly string? priorityLookupPrefix;
+
         private readonly bool hasNumber;
 
-        public LegacyMainCirclePiece(string priorityLookup = null, bool hasNumber = true)
+        protected Drawable CircleSprite = null!;
+        protected Drawable OverlaySprite = null!;
+
+        protected Container OverlayLayer { get; private set; } = null!;
+
+        private SkinnableSpriteText hitCircleText = null!;
+
+        private readonly Bindable<Color4> accentColour = new Bindable<Color4>();
+        private readonly IBindable<int> indexInCurrentCombo = new Bindable<int>();
+
+        [Resolved(canBeNull: true)]
+        private DrawableHitObject? drawableObject { get; set; }
+
+        [Resolved]
+        private ISkinSource skin { get; set; } = null!;
+
+        public LegacyMainCirclePiece(string? priorityLookupPrefix = null, bool hasNumber = true)
         {
-            this.priorityLookup = priorityLookup;
+            this.priorityLookupPrefix = priorityLookupPrefix;
             this.hasNumber = hasNumber;
 
             Size = new Vector2(OsuHitObject.OBJECT_RADIUS * 2);
         }
 
-        private Drawable hitCircleSprite;
-
-        protected Container OverlayLayer { get; private set; }
-
-        private Drawable hitCircleOverlay;
-        private SkinnableSpriteText hitCircleText;
-
-        private readonly Bindable<Color4> accentColour = new Bindable<Color4>();
-        private readonly IBindable<int> indexInCurrentCombo = new Bindable<int>();
-
-        [Resolved]
-        private DrawableHitObject drawableObject { get; set; }
-
-        [Resolved]
-        private ISkinSource skin { get; set; }
-
         [BackgroundDependencyLoader]
         private void load()
         {
-            var drawableOsuObject = (DrawableOsuHitObject)drawableObject;
+            var drawableOsuObject = (DrawableOsuHitObject?)drawableObject;
 
-            bool allowFallback = false;
-
-            // attempt lookup using priority specification
-            Texture baseTexture = getTextureWithFallback(string.Empty);
-
-            // if the base texture was not found without a fallback, switch on fallback mode and re-perform the lookup.
-            if (baseTexture == null)
-            {
-                allowFallback = true;
-                baseTexture = getTextureWithFallback(string.Empty);
-            }
+            // if a base texture for the specified prefix exists, continue using it for subsequent lookups.
+            // otherwise fall back to the default prefix "hitcircle".
+            string circleName = (priorityLookupPrefix != null && skin.GetTexture(priorityLookupPrefix) != null) ? priorityLookupPrefix : @"hitcircle";
 
             // at this point, any further texture fetches should be correctly using the priority source if the base texture was retrieved using it.
-            // the flow above handles the case where a sliderendcircle.png is retrieved from the skin, but sliderendcircleoverlay.png doesn't exist.
-            // expected behaviour in this scenario is not showing the overlay, rather than using hitcircleoverlay.png (potentially from the default/fall-through skin).
+            // the conditional above handles the case where a sliderendcircle.png is retrieved from the skin, but sliderendcircleoverlay.png doesn't exist.
+            // expected behaviour in this scenario is not showing the overlay, rather than using hitcircleoverlay.png.
 
             InternalChildren = new[]
             {
-                hitCircleSprite = new KiaiFlashingDrawable(() => new Sprite { Texture = baseTexture })
+                CircleSprite = new KiaiFlashingDrawable(() => new Sprite { Texture = skin.GetTexture(circleName) })
                 {
                     Anchor = Anchor.Centre,
                     Origin = Anchor.Centre,
@@ -81,7 +79,7 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
                 {
                     Anchor = Anchor.Centre,
                     Origin = Anchor.Centre,
-                    Child = hitCircleOverlay = new KiaiFlashingDrawable(() => getAnimationWithFallback(@"overlay", 1000 / 2d))
+                    Child = OverlaySprite = new KiaiFlashingDrawable(() => skin.GetAnimation(@$"{circleName}overlay", true, true, frameLength: 1000 / 2d))
                     {
                         Anchor = Anchor.Centre,
                         Origin = Anchor.Centre,
@@ -105,39 +103,12 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
             bool overlayAboveNumber = skin.GetConfig<OsuSkinConfiguration, bool>(OsuSkinConfiguration.HitCircleOverlayAboveNumber)?.Value ?? true;
 
             if (overlayAboveNumber)
-                OverlayLayer.ChangeChildDepth(hitCircleOverlay, float.MinValue);
+                OverlayLayer.ChangeChildDepth(OverlaySprite, float.MinValue);
 
-            accentColour.BindTo(drawableObject.AccentColour);
-            indexInCurrentCombo.BindTo(drawableOsuObject.IndexInCurrentComboBindable);
-
-            Texture getTextureWithFallback(string name)
+            if (drawableOsuObject != null)
             {
-                Texture tex = null;
-
-                if (!string.IsNullOrEmpty(priorityLookup))
-                {
-                    tex = skin.GetTexture($"{priorityLookup}{name}");
-
-                    if (!allowFallback)
-                        return tex;
-                }
-
-                return tex ?? skin.GetTexture($"hitcircle{name}");
-            }
-
-            Drawable getAnimationWithFallback(string name, double frameLength)
-            {
-                Drawable animation = null;
-
-                if (!string.IsNullOrEmpty(priorityLookup))
-                {
-                    animation = skin.GetAnimation($"{priorityLookup}{name}", true, true, frameLength: frameLength);
-
-                    if (!allowFallback)
-                        return animation;
-                }
-
-                return animation ?? skin.GetAnimation($"hitcircle{name}", true, true, frameLength: frameLength);
+                accentColour.BindTo(drawableOsuObject.AccentColour);
+                indexInCurrentCombo.BindTo(drawableOsuObject.IndexInCurrentComboBindable);
             }
         }
 
@@ -145,28 +116,31 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
         {
             base.LoadComplete();
 
-            accentColour.BindValueChanged(colour => hitCircleSprite.Colour = LegacyColourCompatibility.DisallowZeroAlpha(colour.NewValue), true);
+            accentColour.BindValueChanged(colour => CircleSprite.Colour = LegacyColourCompatibility.DisallowZeroAlpha(colour.NewValue), true);
             if (hasNumber)
                 indexInCurrentCombo.BindValueChanged(index => hitCircleText.Text = (index.NewValue + 1).ToString(), true);
 
-            drawableObject.ApplyCustomUpdateState += updateStateTransforms;
-            updateStateTransforms(drawableObject, drawableObject.State.Value);
+            if (drawableObject != null)
+            {
+                drawableObject.ApplyCustomUpdateState += updateStateTransforms;
+                updateStateTransforms(drawableObject, drawableObject.State.Value);
+            }
         }
 
         private void updateStateTransforms(DrawableHitObject drawableHitObject, ArmedState state)
         {
             const double legacy_fade_duration = 240;
 
-            using (BeginAbsoluteSequence(drawableObject.HitStateUpdateTime))
+            using (BeginAbsoluteSequence(drawableObject.AsNonNull().HitStateUpdateTime))
             {
                 switch (state)
                 {
                     case ArmedState.Hit:
-                        hitCircleSprite.FadeOut(legacy_fade_duration, Easing.Out);
-                        hitCircleSprite.ScaleTo(1.4f, legacy_fade_duration, Easing.Out);
+                        CircleSprite.FadeOut(legacy_fade_duration, Easing.Out);
+                        CircleSprite.ScaleTo(1.4f, legacy_fade_duration, Easing.Out);
 
-                        hitCircleOverlay.FadeOut(legacy_fade_duration, Easing.Out);
-                        hitCircleOverlay.ScaleTo(1.4f, legacy_fade_duration, Easing.Out);
+                        OverlaySprite.FadeOut(legacy_fade_duration, Easing.Out);
+                        OverlaySprite.ScaleTo(1.4f, legacy_fade_duration, Easing.Out);
 
                         if (hasNumber)
                         {

osu.Game.Tests/Visual/Collections/TestSceneManageCollectionsDialog.cs

@@ -50,7 +50,7 @@ namespace osu.Game.Tests.Visual.Collections
             });
 
             Dependencies.Cache(manager);
-            Dependencies.Cache(dialogOverlay);
+            Dependencies.CacheAs<IDialogOverlay>(dialogOverlay);
         }
 
         [SetUp]

osu.Game.Tests/Visual/Editing/TestSceneComposeScreen.cs

@@ -1,44 +1,71 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
+using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Allocation;
+using osu.Framework.Extensions.ObjectExtensions;
+using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Framework.Testing;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Osu;
 using osu.Game.Rulesets.Osu.Beatmaps;
 using osu.Game.Screens.Edit;
 using osu.Game.Screens.Edit.Compose;
+using osu.Game.Skinning;
 
 namespace osu.Game.Tests.Visual.Editing
 {
     [TestFixture]
     public class TestSceneComposeScreen : EditorClockTestScene
     {
-        [Cached(typeof(EditorBeatmap))]
-        [Cached(typeof(IBeatSnapProvider))]
-        private readonly EditorBeatmap editorBeatmap =
-            new EditorBeatmap(new OsuBeatmap
-            {
-                BeatmapInfo =
-                {
-                    Ruleset = new OsuRuleset().RulesetInfo
-                }
-            });
+        private EditorBeatmap editorBeatmap;
 
         [Cached]
         private EditorClipboard clipboard = new EditorClipboard();
 
-        protected override void LoadComplete()
+        [SetUpSteps]
+        public void SetUpSteps()
         {
-            base.LoadComplete();
-
-            Beatmap.Value = CreateWorkingBeatmap(editorBeatmap.PlayableBeatmap);
-
-            Child = new ComposeScreen
+            AddStep("setup compose screen", () =>
             {
-                State = { Value = Visibility.Visible },
-            };
+                var beatmap = new OsuBeatmap
+                {
+                    BeatmapInfo = { Ruleset = new OsuRuleset().RulesetInfo }
+                };
+
+                editorBeatmap = new EditorBeatmap(beatmap, new LegacyBeatmapSkin(beatmap.BeatmapInfo, null));
+
+                Beatmap.Value = CreateWorkingBeatmap(editorBeatmap.PlayableBeatmap);
+
+                Child = new DependencyProvidingContainer
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    CachedDependencies = new (Type, object)[]
+                    {
+                        (typeof(EditorBeatmap), editorBeatmap),
+                        (typeof(IBeatSnapProvider), editorBeatmap),
+                    },
+                    Child = new ComposeScreen { State = { Value = Visibility.Visible } },
+                };
+            });
+
+            AddUntilStep("wait for composer", () => this.ChildrenOfType<HitObjectComposer>().SingleOrDefault()?.IsLoaded == true);
+        }
+
+        /// <summary>
+        /// Ensures that the skin of the edited beatmap is properly wrapped in a <see cref="LegacySkinTransformer"/>.
+        /// </summary>
+        [Test]
+        public void TestLegacyBeatmapSkinHasTransformer()
+        {
+            AddAssert("legacy beatmap skin has transformer", () =>
+            {
+                var sources = this.ChildrenOfType<BeatmapSkinProvidingContainer>().First().AllSources;
+                return sources.OfType<LegacySkinTransformer>().Count(t => t.Skin == editorBeatmap.BeatmapSkin.AsNonNull().Skin) == 1;
+            });
         }
     }
 }

osu.Game.Tests/Visual/Gameplay/TestScenePlayerLoader.cs

@@ -43,7 +43,7 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Resolved]
         private SessionStatics sessionStatics { get; set; }
 
-        [Cached]
+        [Cached(typeof(INotificationOverlay))]
         private readonly NotificationOverlay notificationOverlay;
 
         [Cached]

osu.Game.Tests/Visual/Menus/IntroTestScene.cs

@@ -26,7 +26,7 @@ namespace osu.Game.Tests.Visual.Menus
 
         private IntroScreen intro;
 
-        [Cached]
+        [Cached(typeof(INotificationOverlay))]
         private NotificationOverlay notifications;
 
         private ScheduledDelegate trackResetDelegate;

osu.Game.Tests/Visual/Menus/TestSceneToolbar.cs

@@ -2,6 +2,7 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Linq;
+using Moq;
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
@@ -22,6 +23,17 @@ namespace osu.Game.Tests.Visual.Menus
         [Resolved]
         private IRulesetStore rulesets { get; set; }
 
+        private readonly Mock<INotificationOverlay> notifications = new Mock<INotificationOverlay>();
+
+        private readonly BindableInt unreadNotificationCount = new BindableInt();
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            Dependencies.CacheAs(notifications.Object);
+            notifications.SetupGet(n => n.UnreadCount).Returns(unreadNotificationCount);
+        }
+
         [SetUp]
         public void SetUp() => Schedule(() =>
         {
@@ -31,10 +43,6 @@ namespace osu.Game.Tests.Visual.Menus
         [Test]
         public void TestNotificationCounter()
         {
-            ToolbarNotificationButton notificationButton = null;
-
-            AddStep("retrieve notification button", () => notificationButton = toolbar.ChildrenOfType<ToolbarNotificationButton>().Single());
-
             setNotifications(1);
             setNotifications(2);
             setNotifications(3);
@@ -43,7 +51,7 @@ namespace osu.Game.Tests.Visual.Menus
 
             void setNotifications(int count)
                 => AddStep($"set notification count to {count}",
-                    () => notificationButton.NotificationCount.Value = count);
+                    () => unreadNotificationCount.Value = count);
         }
 
         [TestCase(false)]

osu.Game.Tests/Visual/Navigation/TestSceneOsuGame.cs

@@ -37,7 +37,7 @@ namespace osu.Game.Tests.Visual.Navigation
             typeof(OsuLogo),
             typeof(IdleTracker),
             typeof(OnScreenDisplay),
-            typeof(NotificationOverlay),
+            typeof(INotificationOverlay),
             typeof(BeatmapListingOverlay),
             typeof(DashboardOverlay),
             typeof(NewsOverlay),
@@ -49,7 +49,7 @@ namespace osu.Game.Tests.Visual.Navigation
             typeof(LoginOverlay),
             typeof(MusicController),
             typeof(AccountCreationOverlay),
-            typeof(DialogOverlay),
+            typeof(IDialogOverlay),
             typeof(ScreenshotManager)
         };
 

osu.Game.Tests/Visual/Navigation/TestScenePerformFromScreen.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Extensions;
+using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Screens;
 using osu.Framework.Testing;
@@ -113,12 +114,12 @@ namespace osu.Game.Tests.Visual.Navigation
             AddAssert("did not perform", () => !actionPerformed);
             AddAssert("only one exit attempt", () => blocker.ExitAttempts == 1);
 
-            AddUntilStep("wait for dialog display", () => Game.Dependencies.Get<DialogOverlay>().IsLoaded);
+            waitForDialogOverlayLoad();
 
             if (confirmed)
             {
                 AddStep("accept dialog", () => InputManager.Key(Key.Number1));
-                AddUntilStep("wait for dialog dismissed", () => Game.Dependencies.Get<DialogOverlay>().CurrentDialog == null);
+                AddUntilStep("wait for dialog dismissed", () => Game.Dependencies.Get<IDialogOverlay>().CurrentDialog == null);
                 AddUntilStep("did perform", () => actionPerformed);
             }
             else
@@ -145,7 +146,7 @@ namespace osu.Game.Tests.Visual.Navigation
 
             AddWaitStep("wait a bit", 10);
 
-            AddUntilStep("wait for dialog display", () => Game.Dependencies.Get<DialogOverlay>().IsLoaded);
+            waitForDialogOverlayLoad();
 
             AddAssert("screen didn't change", () => Game.ScreenStack.CurrentScreen == blocker2);
             AddAssert("did not perform", () => !actionPerformed);
@@ -187,7 +188,7 @@ namespace osu.Game.Tests.Visual.Navigation
 
             AddWaitStep("wait a bit", 10);
 
-            AddUntilStep("wait for dialog display", () => Game.Dependencies.Get<DialogOverlay>().IsLoaded);
+            waitForDialogOverlayLoad();
 
             AddAssert("screen didn't change", () => Game.ScreenStack.CurrentScreen == screenWithNestedStack);
             AddAssert("nested screen didn't change", () => screenWithNestedStack.SubScreenStack.CurrentScreen == screenWithNestedStack.Blocker);
@@ -211,6 +212,8 @@ namespace osu.Game.Tests.Visual.Navigation
             }
         }
 
+        private void waitForDialogOverlayLoad() => AddUntilStep("wait for dialog overlay loaded", () => ((Drawable)Game.Dependencies.Get<IDialogOverlay>()).IsLoaded);
+
         private void importAndWaitForSongSelect()
         {
             AddStep("import beatmap", () => BeatmapImportHelper.LoadQuickOszIntoOsu(Game).WaitSafely());
@@ -221,7 +224,7 @@ namespace osu.Game.Tests.Visual.Navigation
         public class DialogBlockingScreen : OsuScreen
         {
             [Resolved]
-            private DialogOverlay dialogOverlay { get; set; }
+            private IDialogOverlay dialogOverlay { get; set; }
 
             private int dialogDisplayCount;
 

osu.Game.Tests/Visual/Navigation/TestSceneScreenNavigation.cs

@@ -6,6 +6,7 @@ using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Extensions;
+using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Screens;
@@ -200,10 +201,10 @@ namespace osu.Game.Tests.Visual.Navigation
 
             AddStep("choose clear all scores", () => InputManager.Key(Key.Number4));
 
-            AddUntilStep("wait for dialog display", () => Game.Dependencies.Get<DialogOverlay>().IsLoaded);
-            AddUntilStep("wait for dialog", () => Game.Dependencies.Get<DialogOverlay>().CurrentDialog != null);
+            AddUntilStep("wait for dialog display", () => ((Drawable)Game.Dependencies.Get<IDialogOverlay>()).IsLoaded);
+            AddUntilStep("wait for dialog", () => Game.Dependencies.Get<IDialogOverlay>().CurrentDialog != null);
             AddStep("confirm deletion", () => InputManager.Key(Key.Number1));
-            AddUntilStep("wait for dialog dismissed", () => Game.Dependencies.Get<DialogOverlay>().CurrentDialog == null);
+            AddUntilStep("wait for dialog dismissed", () => Game.Dependencies.Get<IDialogOverlay>().CurrentDialog == null);
 
             AddUntilStep("ensure score is pending deletion", () => Game.Realm.Run(r => r.Find<ScoreInfo>(score.ID)?.DeletePending == true));
 
@@ -246,10 +247,10 @@ namespace osu.Game.Tests.Visual.Navigation
                 InputManager.Click(MouseButton.Left);
             });
 
-            AddUntilStep("wait for dialog display", () => Game.Dependencies.Get<DialogOverlay>().IsLoaded);
-            AddUntilStep("wait for dialog", () => Game.Dependencies.Get<DialogOverlay>().CurrentDialog != null);
+            AddUntilStep("wait for dialog display", () => ((Drawable)Game.Dependencies.Get<IDialogOverlay>()).IsLoaded);
+            AddUntilStep("wait for dialog", () => Game.Dependencies.Get<IDialogOverlay>().CurrentDialog != null);
             AddStep("confirm deletion", () => InputManager.Key(Key.Number1));
-            AddUntilStep("wait for dialog dismissed", () => Game.Dependencies.Get<DialogOverlay>().CurrentDialog == null);
+            AddUntilStep("wait for dialog dismissed", () => Game.Dependencies.Get<IDialogOverlay>().CurrentDialog == null);
 
             AddUntilStep("ensure score is pending deletion", () => Game.Realm.Run(r => r.Find<ScoreInfo>(score.ID)?.DeletePending == true));
 

osu.Game.Tests/Visual/Online/TestSceneChatLink.cs

@@ -49,7 +49,7 @@ namespace osu.Game.Tests.Visual.Online
             Dependencies.Cache(chatManager);
 
             Dependencies.Cache(new ChatOverlay());
-            Dependencies.Cache(dialogOverlay);
+            Dependencies.CacheAs<IDialogOverlay>(dialogOverlay);
         }
 
         [SetUp]

osu.Game.Tests/Visual/Online/TestSceneMessageNotifier.cs

@@ -200,7 +200,7 @@ namespace osu.Game.Tests.Visual.Online
             [Cached]
             public ChannelManager ChannelManager { get; } = new ChannelManager();
 
-            [Cached]
+            [Cached(typeof(INotificationOverlay))]
             public NotificationOverlay NotificationOverlay { get; } = new NotificationOverlay
             {
                 Anchor = Anchor.TopRight,

osu.Game.Tests/Visual/Settings/TestSceneMigrationScreens.cs

@@ -14,7 +14,7 @@ namespace osu.Game.Tests.Visual.Settings
 {
     public class TestSceneMigrationScreens : ScreenTestScene
     {
-        [Cached]
+        [Cached(typeof(INotificationOverlay))]
         private readonly NotificationOverlay notifications;
 
         public TestSceneMigrationScreens()

osu.Game.Tests/Visual/Settings/TestSceneSettingsPanel.cs

@@ -97,7 +97,7 @@ namespace osu.Game.Tests.Visual.Settings
                 Depth = -1
             });
 
-            Dependencies.Cache(dialogOverlay);
+            Dependencies.CacheAs<IDialogOverlay>(dialogOverlay);
         }
     }
 }

osu.Game.Tests/Visual/SongSelect/TestSceneBeatmapLeaderboard.cs

@@ -31,7 +31,7 @@ namespace osu.Game.Tests.Visual.SongSelect
     {
         private readonly FailableLeaderboard leaderboard;
 
-        [Cached]
+        [Cached(typeof(IDialogOverlay))]
         private readonly DialogOverlay dialogOverlay;
 
         private ScoreManager scoreManager;

osu.Game.Tests/Visual/SongSelect/TestSceneUserTopScoreContainer.cs

@@ -19,7 +19,7 @@ namespace osu.Game.Tests.Visual.SongSelect
 {
     public class TestSceneUserTopScoreContainer : OsuTestScene
     {
-        [Cached]
+        [Cached(typeof(IDialogOverlay))]
         private readonly DialogOverlay dialogOverlay;
 
         public TestSceneUserTopScoreContainer()

osu.Game.Tests/Visual/UserInterface/TestSceneDeleteLocalScore.cs

@@ -42,7 +42,7 @@ namespace osu.Game.Tests.Visual.UserInterface
 
         private BeatmapInfo beatmapInfo;
 
-        [Cached]
+        [Cached(typeof(IDialogOverlay))]
         private readonly DialogOverlay dialogOverlay;
 
         public TestSceneDeleteLocalScore()

osu.Game.Tests/Visual/UserInterface/TestSceneShearedOverlayHeader.cs

@@ -10,19 +10,19 @@ using osu.Game.Overlays;
 namespace osu.Game.Tests.Visual.UserInterface
 {
     [TestFixture]
-    public class TestScenePopupScreenTitle : OsuTestScene
+    public class TestSceneShearedOverlayHeader : OsuTestScene
     {
         [Cached]
         private OverlayColourProvider colourProvider = new OverlayColourProvider(OverlayColourScheme.Green);
 
         [Test]
-        public void TestPopupScreenTitle()
+        public void TestShearedOverlayHeader()
         {
             AddStep("create content", () =>
             {
-                Child = new PopupScreenTitle
+                Child = new ShearedOverlayHeader
                 {
-                    Title = "Popup Screen Title",
+                    Title = "Sheared overlay header",
                     Description = string.Join(" ", Enumerable.Repeat("This is a description.", 20)),
                     Close = () => { }
                 };
@@ -34,9 +34,9 @@ namespace osu.Game.Tests.Visual.UserInterface
         {
             AddStep("create content", () =>
             {
-                Child = new PopupScreenTitle
+                Child = new ShearedOverlayHeader
                 {
-                    Title = "Popup Screen Title",
+                    Title = "Sheared overlay header",
                     Description = "This is a description."
                 };
             });

osu.Game/Collections/DrawableCollectionListItem.cs

@@ -158,7 +158,7 @@ namespace osu.Game.Collections
             public Func<Vector2, bool> IsTextBoxHovered;
 
             [Resolved(CanBeNull = true)]
-            private DialogOverlay dialogOverlay { get; set; }
+            private IDialogOverlay dialogOverlay { get; set; }
 
             [Resolved(CanBeNull = true)]
             private CollectionManager collectionManager { get; set; }

osu.Game/Database/EFToRealmMigrator.cs

@@ -52,7 +52,7 @@ namespace osu.Game.Database
         private OsuConfigManager config { get; set; } = null!;
 
         [Resolved]
-        private NotificationOverlay notificationOverlay { get; set; } = null!;
+        private INotificationOverlay notificationOverlay { get; set; } = null!;
 
         [Resolved]
         private OsuGame game { get; set; } = null!;

osu.Game/Database/LegacyImportManager.cs

@@ -40,7 +40,7 @@ namespace osu.Game.Database
         private OsuGame game { get; set; }
 
         [Resolved]
-        private DialogOverlay dialogOverlay { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; }
 
         [Resolved(CanBeNull = true)]
         private DesktopGameHost desktopGameHost { get; set; }

osu.Game/Graphics/ScreenshotManager.cs

@@ -43,7 +43,7 @@ namespace osu.Game.Graphics
         private Storage storage;
 
         [Resolved]
-        private NotificationOverlay notificationOverlay { get; set; }
+        private INotificationOverlay notificationOverlay { get; set; }
 
         private Sample shutter;
 

osu.Game/Graphics/UserInterface/ShearedOverlayHeader.cs

@@ -19,8 +19,10 @@ using osuTK;
 
 namespace osu.Game.Graphics.UserInterface
 {
-    public class PopupScreenTitle : CompositeDrawable
+    public class ShearedOverlayHeader : CompositeDrawable
     {
+        public const float HEIGHT = main_area_height + 2 * corner_radius;
+
         public LocalisableString Title
         {
             set => titleSpriteText.Text = value;
@@ -48,7 +50,7 @@ namespace osu.Game.Graphics.UserInterface
         private readonly OsuTextFlowContainer descriptionText;
         private readonly IconButton closeButton;
 
-        public PopupScreenTitle()
+        public ShearedOverlayHeader()
         {
             RelativeSizeAxes = Axes.X;
             AutoSizeAxes = Axes.Y;
@@ -67,7 +69,7 @@ namespace osu.Game.Graphics.UserInterface
                     underlayContainer = new Container
                     {
                         RelativeSizeAxes = Axes.X,
-                        Height = main_area_height + 2 * corner_radius,
+                        Height = HEIGHT,
                         CornerRadius = corner_radius,
                         Masking = true,
                         BorderThickness = 2,

osu.Game/Localisation/DebugLocalisationStore.cs

@@ -0,0 +1,30 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using osu.Framework.Localisation;
+
+namespace osu.Game.Localisation
+{
+    public class DebugLocalisationStore : ILocalisationStore
+    {
+        public string Get(string lookup) => $@"[[{lookup.Substring(lookup.LastIndexOf('.') + 1)}]]";
+
+        public Task<string> GetAsync(string lookup, CancellationToken cancellationToken = default) => Task.FromResult(Get(lookup));
+
+        public Stream GetStream(string name) => throw new NotImplementedException();
+
+        public IEnumerable<string> GetAvailableResources() => throw new NotImplementedException();
+
+        public CultureInfo EffectiveCulture { get; } = CultureInfo.CurrentCulture;
+
+        public void Dispose()
+        {
+        }
+    }
+}

osu.Game/Localisation/Language.cs

@@ -110,6 +110,11 @@ namespace osu.Game.Localisation
         // zh_hk,
 
         [Description(@"繁體中文（台灣）")]
-        zh_hant
+        zh_hant,
+
+#if DEBUG
+        [Description(@"Debug (show raw keys)")]
+        debug
+#endif
     }
 }

osu.Game/Online/API/Requests/GetUserBeatmapsRequest.cs

@@ -13,8 +13,8 @@ namespace osu.Game.Online.API.Requests
 
         private readonly BeatmapSetType type;
 
-        public GetUserBeatmapsRequest(long userId, BeatmapSetType type, int page = 0, int itemsPerPage = 6)
-            : base(page, itemsPerPage)
+        public GetUserBeatmapsRequest(long userId, BeatmapSetType type, PaginationParameters pagination)
+            : base(pagination)
         {
             this.userId = userId;
             this.type = type;

osu.Game/Online/API/Requests/GetUserKudosuHistoryRequest.cs

@@ -10,8 +10,8 @@ namespace osu.Game.Online.API.Requests
     {
         private readonly long userId;
 
-        public GetUserKudosuHistoryRequest(long userId, int page = 0, int itemsPerPage = 5)
-            : base(page, itemsPerPage)
+        public GetUserKudosuHistoryRequest(long userId, PaginationParameters pagination)
+            : base(pagination)
         {
             this.userId = userId;
         }

osu.Game/Online/API/Requests/GetUserMostPlayedBeatmapsRequest.cs

@@ -10,8 +10,8 @@ namespace osu.Game.Online.API.Requests
     {
         private readonly long userId;
 
-        public GetUserMostPlayedBeatmapsRequest(long userId, int page = 0, int itemsPerPage = 5)
-            : base(page, itemsPerPage)
+        public GetUserMostPlayedBeatmapsRequest(long userId, PaginationParameters pagination)
+            : base(pagination)
         {
             this.userId = userId;
         }

osu.Game/Online/API/Requests/GetUserRecentActivitiesRequest.cs

@@ -10,8 +10,8 @@ namespace osu.Game.Online.API.Requests
     {
         private readonly long userId;
 
-        public GetUserRecentActivitiesRequest(long userId, int page = 0, int itemsPerPage = 5)
-            : base(page, itemsPerPage)
+        public GetUserRecentActivitiesRequest(long userId, PaginationParameters pagination)
+            : base(pagination)
         {
             this.userId = userId;
         }

osu.Game/Online/API/Requests/GetUserScoresRequest.cs

@@ -14,8 +14,8 @@ namespace osu.Game.Online.API.Requests
         private readonly ScoreType type;
         private readonly RulesetInfo ruleset;
 
-        public GetUserScoresRequest(long userId, ScoreType type, int page = 0, int itemsPerPage = 5, RulesetInfo ruleset = null)
-            : base(page, itemsPerPage)
+        public GetUserScoresRequest(long userId, ScoreType type, PaginationParameters pagination, RulesetInfo ruleset = null)
+            : base(pagination)
         {
             this.userId = userId;
             this.type = type;

osu.Game/Online/API/Requests/PaginatedAPIRequest.cs

@@ -8,21 +8,19 @@ namespace osu.Game.Online.API.Requests
 {
     public abstract class PaginatedAPIRequest<T> : APIRequest<T> where T : class
     {
-        private readonly int page;
-        private readonly int itemsPerPage;
+        private readonly PaginationParameters pagination;
 
-        protected PaginatedAPIRequest(int page, int itemsPerPage)
+        protected PaginatedAPIRequest(PaginationParameters pagination)
         {
-            this.page = page;
-            this.itemsPerPage = itemsPerPage;
+            this.pagination = pagination;
         }
 
         protected override WebRequest CreateWebRequest()
         {
             var req = base.CreateWebRequest();
 
-            req.AddParameter("offset", (page * itemsPerPage).ToString(CultureInfo.InvariantCulture));
-            req.AddParameter("limit", itemsPerPage.ToString(CultureInfo.InvariantCulture));
+            req.AddParameter("offset", pagination.Offset.ToString(CultureInfo.InvariantCulture));
+            req.AddParameter("limit", pagination.Limit.ToString(CultureInfo.InvariantCulture));
 
             return req;
         }

osu.Game/Online/API/Requests/PaginationParameters.cs

@@ -0,0 +1,38 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+namespace osu.Game.Online.API.Requests
+{
+    /// <summary>
+    /// Represents a pagination data used for <see cref="PaginatedAPIRequest{T}"/>.
+    /// </summary>
+    public readonly struct PaginationParameters
+    {
+        /// <summary>
+        /// The starting point of the request.
+        /// </summary>
+        public int Offset { get; }
+
+        /// <summary>
+        /// The maximum number of items to return in this request.
+        /// </summary>
+        public int Limit { get; }
+
+        public PaginationParameters(int offset, int limit)
+        {
+            Offset = offset;
+            Limit = limit;
+        }
+
+        public PaginationParameters(int limit)
+            : this(0, limit)
+        {
+        }
+
+        /// <summary>
+        /// Returns a <see cref="PaginationParameters"/> of the next number of items defined by <paramref name="limit"/> after this.
+        /// </summary>
+        /// <param name="limit">The limit of the next pagination.</param>
+        public PaginationParameters TakeNext(int limit) => new PaginationParameters(Offset + Limit, limit);
+    }
+}

osu.Game/Online/Chat/ExternalLinkOpener.cs

@@ -17,7 +17,7 @@ namespace osu.Game.Online.Chat
         private GameHost host { get; set; }
 
         [Resolved(CanBeNull = true)]
-        private DialogOverlay dialogOverlay { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; }
 
         private Bindable<bool> externalLinkWarning;
 

osu.Game/Online/Chat/MessageNotifier.cs

@@ -24,7 +24,7 @@ namespace osu.Game.Online.Chat
     public class MessageNotifier : Component
     {
         [Resolved]
-        private NotificationOverlay notifications { get; set; }
+        private INotificationOverlay notifications { get; set; }
 
         [Resolved]
         private ChatOverlay chatOverlay { get; set; }
@@ -170,7 +170,7 @@ namespace osu.Game.Online.Chat
             public override bool IsImportant => false;
 
             [BackgroundDependencyLoader]
-            private void load(OsuColour colours, ChatOverlay chatOverlay, NotificationOverlay notificationOverlay)
+            private void load(OsuColour colours, ChatOverlay chatOverlay, INotificationOverlay notificationOverlay)
             {
                 IconBackground.Colour = colours.PurpleDark;
 

osu.Game/Online/Leaderboards/LeaderboardScore.cs

@@ -64,7 +64,7 @@ namespace osu.Game.Online.Leaderboards
         private List<ScoreComponentLabel> statisticsLabels;
 
         [Resolved(CanBeNull = true)]
-        private DialogOverlay dialogOverlay { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; }
 
         [Resolved(CanBeNull = true)]
         private SongSelect songSelect { get; set; }

osu.Game/OsuGame.cs

@@ -63,7 +63,7 @@ namespace osu.Game
     /// The full osu! experience. Builds on top of <see cref="OsuGameBase"/> to add menus and binding logic
     /// for initial components that are generally retrieved via DI.
     /// </summary>
-    public class OsuGame : OsuGameBase, IKeyBindingHandler<GlobalAction>, ILocalUserPlayInfo
+    public class OsuGame : OsuGameBase, IKeyBindingHandler<GlobalAction>, ILocalUserPlayInfo, IPerformFromScreenRunner
     {
         /// <summary>
         /// The amount of global offset to apply when a left/right anchored overlay is displayed (ie. settings or notifications).
@@ -586,12 +586,6 @@ namespace osu.Game
 
         private PerformFromMenuRunner performFromMainMenuTask;
 
-        /// <summary>
-        /// Perform an action only after returning to a specific screen as indicated by <paramref name="validScreens"/>.
-        /// Eagerly tries to exit the current screen until it succeeds.
-        /// </summary>
-        /// <param name="action">The action to perform once we are in the correct state.</param>
-        /// <param name="validScreens">An optional collection of valid screen types. If any of these screens are already current we can perform the action immediately, else the first valid parent will be made current before performing the action. <see cref="MainMenu"/> is used if not specified.</param>
         public void PerformFromScreen(Action<IScreen> action, IEnumerable<Type> validScreens = null)
         {
             performFromMainMenuTask?.Cancel();
@@ -634,6 +628,14 @@ namespace osu.Game
 
             foreach (var language in Enum.GetValues(typeof(Language)).OfType<Language>())
             {
+#if DEBUG
+                if (language == Language.debug)
+                {
+                    Localisation.AddLanguage(Language.debug.ToString(), new DebugLocalisationStore());
+                    continue;
+                }
+#endif
+
                 string cultureCode = language.ToCultureCode();
 
                 try
@@ -778,7 +780,7 @@ namespace osu.Game
 
             loadComponentSingleFile(onScreenDisplay, Add, true);
 
-            loadComponentSingleFile(Notifications.With(d =>
+            loadComponentSingleFile<INotificationOverlay>(Notifications.With(d =>
             {
                 d.Anchor = Anchor.TopRight;
                 d.Origin = Anchor.TopRight;
@@ -825,7 +827,7 @@ namespace osu.Game
             }, rightFloatingOverlayContent.Add, true);
 
             loadComponentSingleFile(new AccountCreationOverlay(), topMostOverlayContent.Add, true);
-            loadComponentSingleFile(new DialogOverlay(), topMostOverlayContent.Add, true);
+            loadComponentSingleFile<IDialogOverlay>(new DialogOverlay(), topMostOverlayContent.Add, true);
 
             loadComponentSingleFile(CreateHighPerformanceSession(), Add);
 
@@ -982,12 +984,14 @@ namespace osu.Game
         /// <param name="component">The component to load.</param>
         /// <param name="loadCompleteAction">An action to invoke on load completion (generally to add the component to the hierarchy).</param>
         /// <param name="cache">Whether to cache the component as type <typeparamref name="T"/> into the game dependencies before any scheduling.</param>
-        private T loadComponentSingleFile<T>(T component, Action<T> loadCompleteAction, bool cache = false)
-            where T : Drawable
+        private T loadComponentSingleFile<T>(T component, Action<Drawable> loadCompleteAction, bool cache = false)
+            where T : class
         {
             if (cache)
                 dependencies.CacheAs(component);
 
+            var drawableComponent = component as Drawable ?? throw new ArgumentException($"Component must be a {nameof(Drawable)}", nameof(component));
+
             if (component is OsuFocusedOverlayContainer overlay)
                 focusedOverlays.Add(overlay);
 
@@ -1011,7 +1015,7 @@ namespace osu.Game
                         // Since this is running in a separate thread, it is possible for OsuGame to be disposed after LoadComponentAsync has been called
                         // throwing an exception. To avoid this, the call is scheduled on the update thread, which does not run if IsDisposed = true
                         Task task = null;
-                        var del = new ScheduledDelegate(() => task = LoadComponentAsync(component, loadCompleteAction));
+                        var del = new ScheduledDelegate(() => task = LoadComponentAsync(drawableComponent, loadCompleteAction));
                         Scheduler.Add(del);
 
                         // The delegate won't complete if OsuGame has been disposed in the meantime

osu.Game/Overlays/BeatmapSet/Buttons/FavouriteButton.cs

@@ -41,7 +41,7 @@ namespace osu.Game.Overlays.BeatmapSet.Buttons
         }
 
         [BackgroundDependencyLoader(true)]
-        private void load(IAPIProvider api, NotificationOverlay notifications)
+        private void load(IAPIProvider api, INotificationOverlay notifications)
         {
             SpriteIcon icon;
 

osu.Game/Overlays/Dashboard/CurrentlyPlayingDisplay.cs

@@ -14,6 +14,7 @@ using osu.Game.Database;
 using osu.Game.Online.API;
 using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Online.Spectator;
+using osu.Game.Screens;
 using osu.Game.Screens.OnlinePlay.Match.Components;
 using osu.Game.Screens.Play;
 using osu.Game.Users;
@@ -106,7 +107,7 @@ namespace osu.Game.Overlays.Dashboard
             public readonly APIUser User;
 
             [Resolved(canBeNull: true)]
-            private OsuGame game { get; set; }
+            private IPerformFromScreenRunner performer { get; set; }
 
             public PlayingUserPanel(APIUser user)
             {
@@ -140,7 +141,7 @@ namespace osu.Game.Overlays.Dashboard
                                 Text = "Watch",
                                 Anchor = Anchor.TopCentre,
                                 Origin = Anchor.TopCentre,
-                                Action = () => game?.PerformFromScreen(s => s.Push(new SoloSpectator(User))),
+                                Action = () => performer?.PerformFromScreen(s => s.Push(new SoloSpectator(User))),
                                 Enabled = { Value = User.Id != api.LocalUser.Value.Id }
                             }
                         }

osu.Game/Overlays/Dialog/PopupDialog.cs

@@ -216,7 +216,7 @@ namespace osu.Game.Overlays.Dialog
             };
 
             // It's important we start in a visible state so our state fires on hide, even before load.
-            // This is used by the DialogOverlay to know when the dialog was dismissed.
+            // This is used by the dialog overlay to know when the dialog was dismissed.
             Show();
         }
 

osu.Game/Overlays/DialogOverlay.cs

@@ -14,7 +14,7 @@ using osu.Game.Audio.Effects;
 
 namespace osu.Game.Overlays
 {
-    public class DialogOverlay : OsuFocusedOverlayContainer
+    public class DialogOverlay : OsuFocusedOverlayContainer, IDialogOverlay
     {
         private readonly Container dialogContainer;
 

osu.Game/Overlays/IDialogOverlay.cs

@@ -0,0 +1,32 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable enable
+
+using osu.Framework.Allocation;
+using osu.Game.Overlays.Dialog;
+
+namespace osu.Game.Overlays
+{
+    /// <summary>
+    /// A global overlay that can show popup dialogs.
+    /// </summary>
+    [Cached(typeof(IDialogOverlay))]
+    public interface IDialogOverlay
+    {
+        /// <summary>
+        /// Push a new dialog for display.
+        /// </summary>
+        /// <remarks>
+        /// This will immediate dismiss any already displayed dialog (cancelling the action).
+        /// If the dialog instance provided is already displayed, it will be a noop.
+        /// </remarks>
+        /// <param name="dialog">The dialog to be presented.</param>
+        void Push(PopupDialog dialog);
+
+        /// <summary>
+        /// The currently displayed dialog, if any.
+        /// </summary>
+        PopupDialog? CurrentDialog { get; }
+    }
+}

osu.Game/Overlays/INotificationOverlay.cs

@@ -0,0 +1,32 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Game.Overlays.Notifications;
+
+namespace osu.Game.Overlays
+{
+    /// <summary>
+    /// An overlay which is capable of showing notifications to the user.
+    /// </summary>
+    [Cached]
+    public interface INotificationOverlay
+    {
+        /// <summary>
+        /// Post a new notification for display.
+        /// </summary>
+        /// <param name="notification">The notification to display.</param>
+        void Post(Notification notification);
+
+        /// <summary>
+        /// Hide the overlay, if it is currently visible.
+        /// </summary>
+        void Hide();
+
+        /// <summary>
+        /// Current number of unread notifications.
+        /// </summary>
+        IBindable<int> UnreadCount { get; }
+    }
+}

osu.Game/Overlays/Mods/DifficultyMultiplierDisplay.cs

@@ -58,7 +58,7 @@ namespace osu.Game.Overlays.Mods
                 AutoSizeAxes = Axes.X,
                 Masking = true,
                 CornerRadius = ModPanel.CORNER_RADIUS,
-                Shear = new Vector2(ModPanel.SHEAR_X, 0),
+                Shear = new Vector2(ShearedOverlayContainer.SHEAR, 0),
                 Children = new Drawable[]
                 {
                     underlayBackground = new Box
@@ -98,7 +98,7 @@ namespace osu.Game.Overlays.Mods
                                             Anchor = Anchor.Centre,
                                             Origin = Anchor.Centre,
                                             Margin = new MarginPadding { Horizontal = 18 },
-                                            Shear = new Vector2(-ModPanel.SHEAR_X, 0),
+                                            Shear = new Vector2(-ShearedOverlayContainer.SHEAR, 0),
                                             Text = "Difficulty Multiplier",
                                             Font = OsuFont.Default.With(size: 17, weight: FontWeight.SemiBold)
                                         }
@@ -109,7 +109,7 @@ namespace osu.Game.Overlays.Mods
                                     AutoSizeAxes = Axes.Both,
                                     Anchor = Anchor.Centre,
                                     Origin = Anchor.Centre,
-                                    Shear = new Vector2(-ModPanel.SHEAR_X, 0),
+                                    Shear = new Vector2(-ShearedOverlayContainer.SHEAR, 0),
                                     Direction = FillDirection.Horizontal,
                                     Spacing = new Vector2(2, 0),
                                     Children = new Drawable[]

osu.Game/Overlays/Mods/ModColumn.cs

@@ -81,7 +81,7 @@ namespace osu.Game.Overlays.Mods
 
             Width = 320;
             RelativeSizeAxes = Axes.Y;
-            Shear = new Vector2(ModPanel.SHEAR_X, 0);
+            Shear = new Vector2(ShearedOverlayContainer.SHEAR, 0);
 
             Container controlContainer;
             InternalChildren = new Drawable[]
@@ -115,7 +115,7 @@ namespace osu.Game.Overlays.Mods
                                     AutoSizeAxes = Axes.Y,
                                     Anchor = Anchor.CentreLeft,
                                     Origin = Anchor.CentreLeft,
-                                    Shear = new Vector2(-ModPanel.SHEAR_X, 0),
+                                    Shear = new Vector2(-ShearedOverlayContainer.SHEAR, 0),
                                     Padding = new MarginPadding
                                     {
                                         Horizontal = 17,
@@ -195,7 +195,7 @@ namespace osu.Game.Overlays.Mods
                     Scale = new Vector2(0.8f),
                     RelativeSizeAxes = Axes.X,
                     LabelText = "Enable All",
-                    Shear = new Vector2(-ModPanel.SHEAR_X, 0)
+                    Shear = new Vector2(-ShearedOverlayContainer.SHEAR, 0)
                 });
                 panelFlow.Padding = new MarginPadding
                 {
@@ -260,7 +260,7 @@ namespace osu.Game.Overlays.Mods
 
             cancellationTokenSource?.Cancel();
 
-            var panels = newMods.Select(mod => CreateModPanel(mod).With(panel => panel.Shear = new Vector2(-ModPanel.SHEAR_X, 0)));
+            var panels = newMods.Select(mod => CreateModPanel(mod).With(panel => panel.Shear = new Vector2(-ShearedOverlayContainer.SHEAR, 0)));
 
             Task? loadTask;
 

osu.Game/Overlays/Mods/ModPanel.cs

@@ -42,7 +42,6 @@ namespace osu.Game.Overlays.Mods
 
         protected const double TRANSITION_DURATION = 150;
 
-        public const float SHEAR_X = 0.2f;
         public const float CORNER_RADIUS = 7;
 
         protected const float HEIGHT = 42;
@@ -67,7 +66,7 @@ namespace osu.Game.Overlays.Mods
             Content.Masking = true;
             Content.CornerRadius = CORNER_RADIUS;
             Content.BorderThickness = 2;
-            Content.Shear = new Vector2(SHEAR_X, 0);
+            Content.Shear = new Vector2(ShearedOverlayContainer.SHEAR, 0);
 
             Children = new Drawable[]
             {
@@ -83,7 +82,7 @@ namespace osu.Game.Overlays.Mods
                         Anchor = Anchor.Centre,
                         Origin = Anchor.Centre,
                         Active = { BindTarget = Active },
-                        Shear = new Vector2(-SHEAR_X, 0),
+                        Shear = new Vector2(-ShearedOverlayContainer.SHEAR, 0),
                         Scale = new Vector2(HEIGHT / ModSwitchSmall.DEFAULT_SIZE)
                     }
                 },
@@ -116,10 +115,10 @@ namespace osu.Game.Overlays.Mods
                                     {
                                         Text = mod.Name,
                                         Font = OsuFont.TorusAlternate.With(size: 18, weight: FontWeight.SemiBold),
-                                        Shear = new Vector2(-SHEAR_X, 0),
+                                        Shear = new Vector2(-ShearedOverlayContainer.SHEAR, 0),
                                         Margin = new MarginPadding
                                         {
-                                            Left = -18 * SHEAR_X
+                                            Left = -18 * ShearedOverlayContainer.SHEAR
                                         }
                                     },
                                     new OsuSpriteText
@@ -128,7 +127,7 @@ namespace osu.Game.Overlays.Mods
                                         Font = OsuFont.Default.With(size: 12),
                                         RelativeSizeAxes = Axes.X,
                                         Truncate = true,
-                                        Shear = new Vector2(-SHEAR_X, 0)
+                                        Shear = new Vector2(-ShearedOverlayContainer.SHEAR, 0)
                                     }
                                 }
                             }

osu.Game/Overlays/Mods/ModSelectScreen.cs

@@ -11,7 +11,6 @@ using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Shapes;
 using osu.Framework.Input.Events;
 using osu.Framework.Layout;
 using osu.Game.Configuration;
@@ -23,16 +22,13 @@ using osuTK.Input;
 
 namespace osu.Game.Overlays.Mods
 {
-    public abstract class ModSelectScreen : OsuFocusedOverlayContainer
+    public abstract class ModSelectScreen : ShearedOverlayContainer
     {
-        [Cached]
-        private OverlayColourProvider colourProvider = new OverlayColourProvider(OverlayColourScheme.Green);
+        protected override OverlayColourScheme ColourScheme => OverlayColourScheme.Green;
 
         [Cached]
         public Bindable<IReadOnlyList<Mod>> SelectedMods { get; private set; } = new Bindable<IReadOnlyList<Mod>>(Array.Empty<Mod>());
 
-        protected override bool StartHidden => true;
-
         private Func<Mod, bool> isValidMod = m => true;
 
         public Func<Mod, bool> IsValidMod
@@ -63,132 +59,21 @@ namespace osu.Game.Overlays.Mods
 
         private DifficultyMultiplierDisplay? multiplierDisplay;
         private ModSettingsArea modSettingsArea = null!;
-        private Container aboveColumnsContainer = null!;
         private FillFlowContainer<ModColumn> columnFlow = null!;
-        private GridContainer grid = null!;
-        private Container mainContent = null!;
-
-        private PopupScreenTitle header = null!;
-        private Container footer = null!;
 
         [BackgroundDependencyLoader]
         private void load()
         {
-            RelativeSizeAxes = Axes.Both;
-            RelativePositionAxes = Axes.Both;
+            Header.Title = "Mod Select";
+            Header.Description = "Mods provide different ways to enjoy gameplay. Some have an effect on the score you can achieve during ranked play. Others are just for fun.";
 
-            InternalChildren = new Drawable[]
+            AddRange(new Drawable[]
             {
-                mainContent = new Container
+                new ClickToReturnContainer
                 {
-                    Origin = Anchor.BottomCentre,
-                    Anchor = Anchor.BottomCentre,
                     RelativeSizeAxes = Axes.Both,
-                    Children = new Drawable[]
-                    {
-                        grid = new GridContainer
-                        {
-                            RelativeSizeAxes = Axes.Both,
-                            RowDimensions = new[]
-                            {
-                                new Dimension(GridSizeMode.AutoSize),
-                                new Dimension(GridSizeMode.AutoSize),
-                                new Dimension(),
-                                new Dimension(GridSizeMode.Absolute, 75),
-                            },
-                            Content = new[]
-                            {
-                                new Drawable[]
-                                {
-                                    header = new PopupScreenTitle
-                                    {
-                                        Anchor = Anchor.TopCentre,
-                                        Origin = Anchor.TopCentre,
-                                        Title = "Mod Select",
-                                        Description = "Mods provide different ways to enjoy gameplay. Some have an effect on the score you can achieve during ranked play. Others are just for fun.",
-                                        Close = Hide
-                                    }
-                                },
-                                new Drawable[]
-                                {
-                                    aboveColumnsContainer = new Container
-                                    {
-                                        Anchor = Anchor.Centre,
-                                        Origin = Anchor.Centre,
-                                        AutoSizeAxes = Axes.X,
-                                        RelativePositionAxes = Axes.X,
-                                        X = 0.3f,
-                                        Height = DifficultyMultiplierDisplay.HEIGHT,
-                                        Margin = new MarginPadding
-                                        {
-                                            Horizontal = 100,
-                                            Vertical = 10
-                                        }
-                                    }
-                                },
-                                new Drawable[]
-                                {
-                                    new Container
-                                    {
-                                        Depth = float.MaxValue,
-                                        RelativeSizeAxes = Axes.Both,
-                                        RelativePositionAxes = Axes.Both,
-                                        Children = new Drawable[]
-                                        {
-                                            new OsuScrollContainer(Direction.Horizontal)
-                                            {
-                                                RelativeSizeAxes = Axes.Both,
-                                                Masking = false,
-                                                ClampExtension = 100,
-                                                ScrollbarOverlapsContent = false,
-                                                Child = columnFlow = new ModColumnContainer
-                                                {
-                                                    Direction = FillDirection.Horizontal,
-                                                    RelativeSizeAxes = Axes.Y,
-                                                    AutoSizeAxes = Axes.X,
-                                                    Spacing = new Vector2(10, 0),
-                                                    Margin = new MarginPadding { Right = 70 },
-                                                    Children = new[]
-                                                    {
-                                                        CreateModColumn(ModType.DifficultyReduction, new[] { Key.Q, Key.W, Key.E, Key.R, Key.T, Key.Y, Key.U, Key.I, Key.O, Key.P }),
-                                                        CreateModColumn(ModType.DifficultyIncrease, new[] { Key.A, Key.S, Key.D, Key.F, Key.G, Key.H, Key.J, Key.K, Key.L }),
-                                                        CreateModColumn(ModType.Automation, new[] { Key.Z, Key.X, Key.C, Key.V, Key.B, Key.N, Key.M }),
-                                                        CreateModColumn(ModType.Conversion),
-                                                        CreateModColumn(ModType.Fun)
-                                                    }
-                                                }
-                                            }
-                                        }
-                                    }
-                                },
-                                new[] { Empty() }
-                            }
-                        },
-                        footer = new Container
-                        {
-                            RelativeSizeAxes = Axes.X,
-                            AutoSizeAxes = Axes.Y,
-                            Anchor = Anchor.BottomCentre,
-                            Origin = Anchor.BottomCentre,
-                            Children = new Drawable[]
-                            {
-                                new Box
-                                {
-                                    RelativeSizeAxes = Axes.X,
-                                    Height = 50,
-                                    Anchor = Anchor.BottomCentre,
-                                    Origin = Anchor.BottomCentre,
-                                    Colour = colourProvider.Background5
-                                },
-                            }
-                        },
-                        new ClickToReturnContainer
-                        {
-                            RelativeSizeAxes = Axes.Both,
-                            HandleMouse = { BindTarget = customisationVisible },
-                            OnClicked = () => customisationVisible.Value = false
-                        }
-                    }
+                    HandleMouse = { BindTarget = customisationVisible },
+                    OnClicked = () => customisationVisible.Value = false
                 },
                 modSettingsArea = new ModSettingsArea
                 {
@@ -196,30 +81,73 @@ namespace osu.Game.Overlays.Mods
                     Origin = Anchor.BottomCentre,
                     Height = 0
                 }
-            };
+            });
 
-            if (AllowConfiguration)
+            MainAreaContent.AddRange(new Drawable[]
             {
-                footer.Add(new ShearedToggleButton(200)
+                new Container
                 {
-                    Anchor = Anchor.BottomLeft,
-                    Origin = Anchor.BottomLeft,
-                    Margin = new MarginPadding { Vertical = 14, Left = 70 },
-                    Text = "Mod Customisation",
-                    Active = { BindTarget = customisationVisible }
-                });
-            }
+                    Anchor = Anchor.TopRight,
+                    Origin = Anchor.TopRight,
+                    AutoSizeAxes = Axes.X,
+                    Height = DifficultyMultiplierDisplay.HEIGHT,
+                    Margin = new MarginPadding
+                    {
+                        Horizontal = 100,
+                    },
+                    Child = multiplierDisplay = new DifficultyMultiplierDisplay
+                    {
+                        Anchor = Anchor.Centre,
+                        Origin = Anchor.Centre
+                    }
+                },
+                new Container
+                {
+                    Padding = new MarginPadding
+                    {
+                        Top = DifficultyMultiplierDisplay.HEIGHT + PADDING,
+                    },
+                    Depth = float.MaxValue,
+                    RelativeSizeAxes = Axes.Both,
+                    RelativePositionAxes = Axes.Both,
+                    Children = new Drawable[]
+                    {
+                        new OsuScrollContainer(Direction.Horizontal)
+                        {
+                            RelativeSizeAxes = Axes.Both,
+                            Masking = false,
+                            ClampExtension = 100,
+                            ScrollbarOverlapsContent = false,
+                            Child = columnFlow = new ModColumnContainer
+                            {
+                                Direction = FillDirection.Horizontal,
+                                Shear = new Vector2(SHEAR, 0),
+                                RelativeSizeAxes = Axes.Y,
+                                AutoSizeAxes = Axes.X,
+                                Spacing = new Vector2(10, 0),
+                                Margin = new MarginPadding { Right = 70 },
+                                Children = new[]
+                                {
+                                    CreateModColumn(ModType.DifficultyReduction, new[] { Key.Q, Key.W, Key.E, Key.R, Key.T, Key.Y, Key.U, Key.I, Key.O, Key.P }),
+                                    CreateModColumn(ModType.DifficultyIncrease, new[] { Key.A, Key.S, Key.D, Key.F, Key.G, Key.H, Key.J, Key.K, Key.L }),
+                                    CreateModColumn(ModType.Automation, new[] { Key.Z, Key.X, Key.C, Key.V, Key.B, Key.N, Key.M }),
+                                    CreateModColumn(ModType.Conversion),
+                                    CreateModColumn(ModType.Fun)
+                                }
+                            }
+                        }
+                    }
+                }
+            });
 
-            if (ShowTotalMultiplier)
+            Footer.Add(new ShearedToggleButton(200)
             {
-                aboveColumnsContainer.Add(multiplierDisplay = new DifficultyMultiplierDisplay
-                {
-                    Anchor = Anchor.CentreRight,
-                    Origin = Anchor.CentreRight
-                });
-            }
-
-            columnFlow.Shear = new Vector2(ModPanel.SHEAR_X, 0);
+                Anchor = Anchor.BottomLeft,
+                Origin = Anchor.BottomLeft,
+                Margin = new MarginPadding { Vertical = PADDING, Left = 70 },
+                Text = "Mod Customisation",
+                Active = { BindTarget = customisationVisible }
+            });
         }
 
         protected override void LoadComplete()
@@ -298,12 +226,12 @@ namespace osu.Game.Overlays.Mods
         {
             const double transition_duration = 300;
 
-            grid.FadeColour(customisationVisible.Value ? Colour4.Gray : Colour4.White, transition_duration, Easing.InOutCubic);
+            MainAreaContent.FadeColour(customisationVisible.Value ? Colour4.Gray : Colour4.White, transition_duration, Easing.InOutCubic);
 
             float modAreaHeight = customisationVisible.Value ? ModSettingsArea.HEIGHT : 0;
 
             modSettingsArea.ResizeHeightTo(modAreaHeight, transition_duration, Easing.InOutCubic);
-            mainContent.TransformTo(nameof(Margin), new MarginPadding { Bottom = modAreaHeight }, transition_duration, Easing.InOutCubic);
+            TopLevelContent.MoveToY(-modAreaHeight, transition_duration, Easing.InOutCubic);
         }
 
         private bool selectionBindableSyncInProgress;
@@ -338,10 +266,6 @@ namespace osu.Game.Overlays.Mods
             const double fade_in_duration = 400;
 
             base.PopIn();
-            this.FadeIn(fade_in_duration, Easing.OutQuint);
-
-            header.MoveToY(0, fade_in_duration, Easing.OutQuint);
-            footer.MoveToY(0, fade_in_duration, Easing.OutQuint);
 
             multiplierDisplay?
                 .Delay(fade_in_duration * 0.65f)
@@ -362,15 +286,11 @@ namespace osu.Game.Overlays.Mods
             const double fade_out_duration = 500;
 
             base.PopOut();
-            this.FadeOut(fade_out_duration, Easing.OutQuint);
 
             multiplierDisplay?
                 .FadeOut(fade_out_duration / 2, Easing.OutQuint)
                 .ScaleTo(0.75f, fade_out_duration, Easing.OutQuint);
 
-            header.MoveToY(-header.DrawHeight, fade_out_duration, Easing.OutQuint);
-            footer.MoveToY(footer.DrawHeight, fade_out_duration, Easing.OutQuint);
-
             for (int i = 0; i < columnFlow.Count; i++)
             {
                 const float distance = 700;
@@ -406,7 +326,7 @@ namespace osu.Game.Overlays.Mods
                 {
                     Padding = new MarginPadding
                     {
-                        Left = DrawHeight * ModPanel.SHEAR_X,
+                        Left = DrawHeight * SHEAR,
                         Bottom = 10
                     };
 

osu.Game/Overlays/Mods/ShearedOverlayContainer.cs

@@ -0,0 +1,138 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics.Containers;
+using osu.Game.Graphics.UserInterface;
+
+namespace osu.Game.Overlays.Mods
+{
+    /// <summary>
+    /// A sheared overlay which provides a header and footer and basic animations.
+    /// Exposes <see cref="TopLevelContent"/>, <see cref="MainAreaContent"/> and <see cref="Footer"/> as valid targets for content.
+    /// </summary>
+    public abstract class ShearedOverlayContainer : OsuFocusedOverlayContainer
+    {
+        protected const float PADDING = 14;
+
+        public const float SHEAR = 0.2f;
+
+        [Cached]
+        protected readonly OverlayColourProvider ColourProvider;
+
+        /// <summary>
+        /// The overlay's header.
+        /// </summary>
+        protected ShearedOverlayHeader Header { get; private set; }
+
+        /// <summary>
+        /// The overlay's footer.
+        /// </summary>
+        protected Container Footer { get; private set; }
+
+        /// <summary>
+        /// A container containing all content, including the header and footer.
+        /// May be used for overlay-wide animations.
+        /// </summary>
+        protected Container TopLevelContent { get; private set; }
+
+        /// <summary>
+        /// A container for content that is to be displayed between the header and footer.
+        /// </summary>
+        protected Container MainAreaContent { get; private set; }
+
+        /// <summary>
+        /// A container for content that is to be displayed inside the footer.
+        /// </summary>
+        protected Container FooterContent { get; private set; }
+
+        protected abstract OverlayColourScheme ColourScheme { get; }
+
+        protected override bool StartHidden => true;
+
+        protected override bool BlockNonPositionalInput => true;
+
+        protected ShearedOverlayContainer()
+        {
+            RelativeSizeAxes = Axes.Both;
+
+            ColourProvider = new OverlayColourProvider(ColourScheme);
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            const float footer_height = 50;
+
+            Child = TopLevelContent = new Container
+            {
+                RelativeSizeAxes = Axes.Both,
+                Children = new Drawable[]
+                {
+                    Header = new ShearedOverlayHeader
+                    {
+                        Anchor = Anchor.TopCentre,
+                        Depth = float.MinValue,
+                        Origin = Anchor.TopCentre,
+                        Close = Hide
+                    },
+                    MainAreaContent = new Container
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        Padding = new MarginPadding
+                        {
+                            Top = ShearedOverlayHeader.HEIGHT,
+                            Bottom = footer_height + PADDING,
+                        }
+                    },
+                    Footer = new Container
+                    {
+                        RelativeSizeAxes = Axes.X,
+                        Depth = float.MinValue,
+                        Height = footer_height,
+                        Margin = new MarginPadding { Top = PADDING },
+                        Anchor = Anchor.BottomCentre,
+                        Origin = Anchor.BottomCentre,
+                        Children = new Drawable[]
+                        {
+                            new Box
+                            {
+                                RelativeSizeAxes = Axes.Both,
+                                Colour = ColourProvider.Background5
+                            },
+                            FooterContent = new Container
+                            {
+                                RelativeSizeAxes = Axes.Both,
+                            },
+                        }
+                    }
+                }
+            };
+        }
+
+        protected override void PopIn()
+        {
+            const double fade_in_duration = 400;
+
+            base.PopIn();
+            this.FadeIn(fade_in_duration, Easing.OutQuint);
+
+            Header.MoveToY(0, fade_in_duration, Easing.OutQuint);
+            Footer.MoveToY(0, fade_in_duration, Easing.OutQuint);
+        }
+
+        protected override void PopOut()
+        {
+            const double fade_out_duration = 500;
+
+            base.PopOut();
+            this.FadeOut(fade_out_duration, Easing.OutQuint);
+
+            Header.MoveToY(-Header.DrawHeight, fade_out_duration, Easing.OutQuint);
+            Footer.MoveToY(Footer.DrawHeight, fade_out_duration, Easing.OutQuint);
+        }
+    }
+}

osu.Game/Overlays/NotificationOverlay.cs

@@ -19,7 +19,7 @@ using osu.Game.Localisation;
 
 namespace osu.Game.Overlays
 {
-    public class NotificationOverlay : OsuFocusedOverlayContainer, INamedOverlayComponent
+    public class NotificationOverlay : OsuFocusedOverlayContainer, INamedOverlayComponent, INotificationOverlay
     {
         public string IconTexture => "Icons/Hexacons/notification";
         public LocalisableString Title => NotificationsStrings.HeaderTitle;
@@ -99,7 +99,9 @@ namespace osu.Game.Overlays
             OverlayActivationMode.BindValueChanged(_ => updateProcessingMode(), true);
         }
 
-        public readonly BindableInt UnreadCount = new BindableInt();
+        public IBindable<int> UnreadCount => unreadCount;
+
+        private readonly BindableInt unreadCount = new BindableInt();
 
         private int runningDepth;
 
@@ -111,10 +113,6 @@ namespace osu.Game.Overlays
 
         private double? lastSamplePlayback;
 
-        /// <summary>
-        /// Post a new notification for display.
-        /// </summary>
-        /// <param name="notification">The notification to display.</param>
         public void Post(Notification notification) => postScheduler.Add(() =>
         {
             ++runningDepth;
@@ -184,7 +182,7 @@ namespace osu.Game.Overlays
 
         private void updateCounts()
         {
-            UnreadCount.Value = sections.Select(c => c.UnreadCount).Sum();
+            unreadCount.Value = sections.Select(c => c.UnreadCount).Sum();
         }
 
         private void markAllRead()

osu.Game/Overlays/Profile/Sections/Beatmaps/PaginatedBeatmapContainer.cs

@@ -20,11 +20,12 @@ namespace osu.Game.Overlays.Profile.Sections.Beatmaps
         private const float panel_padding = 10f;
         private readonly BeatmapSetType type;
 
+        protected override int InitialItemsCount => type == BeatmapSetType.Graveyard ? 2 : 6;
+
         public PaginatedBeatmapContainer(BeatmapSetType type, Bindable<APIUser> user, LocalisableString headerText)
             : base(user, headerText)
         {
             this.type = type;
-            ItemsPerPage = 6;
         }
 
         [BackgroundDependencyLoader]
@@ -57,8 +58,8 @@ namespace osu.Game.Overlays.Profile.Sections.Beatmaps
             }
         }
 
-        protected override APIRequest<List<APIBeatmapSet>> CreateRequest() =>
-            new GetUserBeatmapsRequest(User.Value.Id, type, VisiblePages++, ItemsPerPage);
+        protected override APIRequest<List<APIBeatmapSet>> CreateRequest(PaginationParameters pagination) =>
+            new GetUserBeatmapsRequest(User.Value.Id, type, pagination);
 
         protected override Drawable CreateDrawableItem(APIBeatmapSet model) => model.OnlineID > 0
             ? new BeatmapCardNormal(model)

osu.Game/Overlays/Profile/Sections/Historical/PaginatedMostPlayedBeatmapContainer.cs

@@ -19,7 +19,6 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
         public PaginatedMostPlayedBeatmapContainer(Bindable<APIUser> user)
             : base(user, UsersStrings.ShowExtraHistoricalMostPlayedTitle)
         {
-            ItemsPerPage = 5;
         }
 
         [BackgroundDependencyLoader]
@@ -30,8 +29,8 @@ namespace osu.Game.Overlays.Profile.Sections.Historical
 
         protected override int GetCount(APIUser user) => user.BeatmapPlayCountsCount;
 
-        protected override APIRequest<List<APIUserMostPlayedBeatmap>> CreateRequest() =>
-            new GetUserMostPlayedBeatmapsRequest(User.Value.Id, VisiblePages++, ItemsPerPage);
+        protected override APIRequest<List<APIUserMostPlayedBeatmap>> CreateRequest(PaginationParameters pagination) =>
+            new GetUserMostPlayedBeatmapsRequest(User.Value.Id, pagination);
 
         protected override Drawable CreateDrawableItem(APIUserMostPlayedBeatmap mostPlayed) =>
             new DrawableMostPlayedBeatmap(mostPlayed);

osu.Game/Overlays/Profile/Sections/Kudosu/PaginatedKudosuHistoryContainer.cs

@@ -17,11 +17,10 @@ namespace osu.Game.Overlays.Profile.Sections.Kudosu
         public PaginatedKudosuHistoryContainer(Bindable<APIUser> user)
             : base(user, missingText: UsersStrings.ShowExtraKudosuEntryEmpty)
         {
-            ItemsPerPage = 5;
         }
 
-        protected override APIRequest<List<APIKudosuHistory>> CreateRequest()
-            => new GetUserKudosuHistoryRequest(User.Value.Id, VisiblePages++, ItemsPerPage);
+        protected override APIRequest<List<APIKudosuHistory>> CreateRequest(PaginationParameters pagination)
+            => new GetUserKudosuHistoryRequest(User.Value.Id, pagination);
 
         protected override Drawable CreateDrawableItem(APIKudosuHistory item) => new DrawableKudosuHistoryItem(item);
     }

osu.Game/Overlays/Profile/Sections/PaginatedProfileSubsection.cs

@@ -14,6 +14,7 @@ using osu.Game.Graphics.Sprites;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Online.API;
 using osu.Game.Graphics.Containers;
+using osu.Game.Online.API.Requests;
 using osu.Game.Online.API.Requests.Responses;
 using osuTK;
 
@@ -21,11 +22,20 @@ namespace osu.Game.Overlays.Profile.Sections
 {
     public abstract class PaginatedProfileSubsection<TModel> : ProfileSubsection
     {
+        /// <summary>
+        /// The number of items displayed per page.
+        /// </summary>
+        protected virtual int ItemsPerPage => 50;
+
+        /// <summary>
+        /// The number of items displayed initially.
+        /// </summary>
+        protected virtual int InitialItemsCount => 5;
+
         [Resolved]
         private IAPIProvider api { get; set; }
 
-        protected int VisiblePages;
-        protected int ItemsPerPage;
+        protected PaginationParameters? CurrentPage { get; private set; }
 
         protected ReverseChildIDFillFlowContainer<Drawable> ItemsContainer { get; private set; }
 
@@ -87,7 +97,7 @@ namespace osu.Game.Overlays.Profile.Sections
             loadCancellation?.Cancel();
             retrievalRequest?.Cancel();
 
-            VisiblePages = 0;
+            CurrentPage = null;
             ItemsContainer.Clear();
 
             if (e.NewValue != null)
@@ -101,7 +111,9 @@ namespace osu.Game.Overlays.Profile.Sections
         {
             loadCancellation = new CancellationTokenSource();
 
-            retrievalRequest = CreateRequest();
+            CurrentPage = CurrentPage?.TakeNext(ItemsPerPage) ?? new PaginationParameters(InitialItemsCount);
+
+            retrievalRequest = CreateRequest(CurrentPage.Value);
             retrievalRequest.Success += UpdateItems;
 
             api.Queue(retrievalRequest);
@@ -111,7 +123,7 @@ namespace osu.Game.Overlays.Profile.Sections
         {
             OnItemsReceived(items);
 
-            if (!items.Any() && VisiblePages == 1)
+            if (!items.Any() && CurrentPage?.Offset == 0)
             {
                 moreButton.Hide();
                 moreButton.IsLoading = false;
@@ -125,7 +137,8 @@ namespace osu.Game.Overlays.Profile.Sections
             LoadComponentsAsync(items.Select(CreateDrawableItem).Where(d => d != null), drawables =>
             {
                 missing.Hide();
-                moreButton.FadeTo(items.Count == ItemsPerPage ? 1 : 0);
+
+                moreButton.FadeTo(items.Count == CurrentPage?.Limit ? 1 : 0);
                 moreButton.IsLoading = false;
 
                 ItemsContainer.AddRange(drawables);
@@ -138,7 +151,7 @@ namespace osu.Game.Overlays.Profile.Sections
         {
         }
 
-        protected abstract APIRequest<List<TModel>> CreateRequest();
+        protected abstract APIRequest<List<TModel>> CreateRequest(PaginationParameters pagination);
 
         protected abstract Drawable CreateDrawableItem(TModel model);
 

osu.Game/Overlays/Profile/Sections/Ranks/PaginatedScoreContainer.cs

@@ -23,8 +23,6 @@ namespace osu.Game.Overlays.Profile.Sections.Ranks
             : base(user, headerText)
         {
             this.type = type;
-
-            ItemsPerPage = 5;
         }
 
         [BackgroundDependencyLoader]
@@ -56,14 +54,14 @@ namespace osu.Game.Overlays.Profile.Sections.Ranks
 
         protected override void OnItemsReceived(List<APIScore> items)
         {
-            if (VisiblePages == 0)
+            if (CurrentPage == null || CurrentPage?.Offset == 0)
                 drawableItemIndex = 0;
 
             base.OnItemsReceived(items);
         }
 
-        protected override APIRequest<List<APIScore>> CreateRequest() =>
-            new GetUserScoresRequest(User.Value.Id, type, VisiblePages++, ItemsPerPage);
+        protected override APIRequest<List<APIScore>> CreateRequest(PaginationParameters pagination) =>
+            new GetUserScoresRequest(User.Value.Id, type, pagination);
 
         private int drawableItemIndex;
 

osu.Game/Overlays/Profile/Sections/Recent/PaginatedRecentActivityContainer.cs

@@ -19,7 +19,6 @@ namespace osu.Game.Overlays.Profile.Sections.Recent
         public PaginatedRecentActivityContainer(Bindable<APIUser> user)
             : base(user, missingText: EventsStrings.Empty)
         {
-            ItemsPerPage = 10;
         }
 
         [BackgroundDependencyLoader]
@@ -28,8 +27,8 @@ namespace osu.Game.Overlays.Profile.Sections.Recent
             ItemsContainer.Spacing = new Vector2(0, 8);
         }
 
-        protected override APIRequest<List<APIRecentActivity>> CreateRequest() =>
-            new GetUserRecentActivitiesRequest(User.Value.Id, VisiblePages++, ItemsPerPage);
+        protected override APIRequest<List<APIRecentActivity>> CreateRequest(PaginationParameters pagination) =>
+            new GetUserRecentActivitiesRequest(User.Value.Id, pagination);
 
         protected override Drawable CreateDrawableItem(APIRecentActivity model) => new DrawableRecentActivity(model);
     }

osu.Game/Overlays/Settings/Sections/DebugSettings/GeneralSettings.cs

@@ -7,6 +7,7 @@ using osu.Framework.Graphics;
 using osu.Framework.Localisation;
 using osu.Framework.Screens;
 using osu.Game.Localisation;
+using osu.Game.Screens;
 using osu.Game.Screens.Import;
 
 namespace osu.Game.Overlays.Settings.Sections.DebugSettings
@@ -16,7 +17,7 @@ namespace osu.Game.Overlays.Settings.Sections.DebugSettings
         protected override LocalisableString Header => DebugSettingsStrings.GeneralHeader;
 
         [BackgroundDependencyLoader(true)]
-        private void load(FrameworkDebugConfigManager config, FrameworkConfigManager frameworkConfig, OsuGame game)
+        private void load(FrameworkDebugConfigManager config, FrameworkConfigManager frameworkConfig, IPerformFromScreenRunner performer)
         {
             Children = new Drawable[]
             {
@@ -34,7 +35,7 @@ namespace osu.Game.Overlays.Settings.Sections.DebugSettings
             Add(new SettingsButton
             {
                 Text = DebugSettingsStrings.ImportFiles,
-                Action = () => game?.PerformFromScreen(menu => menu.Push(new FileImportScreen()))
+                Action = () => performer?.PerformFromScreen(menu => menu.Push(new FileImportScreen()))
             });
         }
     }

osu.Game/Overlays/Settings/Sections/General/UpdateSettings.cs

@@ -27,7 +27,7 @@ namespace osu.Game.Overlays.Settings.Sections.General
         private SettingsButton checkForUpdatesButton;
 
         [Resolved(CanBeNull = true)]
-        private NotificationOverlay notifications { get; set; }
+        private INotificationOverlay notifications { get; set; }
 
         [BackgroundDependencyLoader(true)]
         private void load(Storage storage, OsuConfigManager config, OsuGame game)

osu.Game/Overlays/Settings/Sections/Maintenance/GeneralSettings.cs

@@ -30,7 +30,7 @@ namespace osu.Game.Overlays.Settings.Sections.Maintenance
         private SettingsButton undeleteButton;
 
         [BackgroundDependencyLoader(permitNulls: true)]
-        private void load(BeatmapManager beatmaps, ScoreManager scores, SkinManager skins, [CanBeNull] CollectionManager collectionManager, [CanBeNull] LegacyImportManager legacyImportManager, DialogOverlay dialogOverlay)
+        private void load(BeatmapManager beatmaps, ScoreManager scores, SkinManager skins, [CanBeNull] CollectionManager collectionManager, [CanBeNull] LegacyImportManager legacyImportManager, IDialogOverlay dialogOverlay)
         {
             if (legacyImportManager?.SupportsImportFromStable == true)
             {

osu.Game/Overlays/Settings/Sections/Maintenance/MigrationRunScreen.cs

@@ -27,7 +27,7 @@ namespace osu.Game.Overlays.Settings.Sections.Maintenance
         private OsuGame game { get; set; }
 
         [Resolved]
-        private NotificationOverlay notifications { get; set; }
+        private INotificationOverlay notifications { get; set; }
 
         [Resolved]
         private Storage storage { get; set; }

osu.Game/Overlays/Settings/Sections/Maintenance/MigrationSelectScreen.cs

@@ -23,7 +23,7 @@ namespace osu.Game.Overlays.Settings.Sections.Maintenance
         private OsuGameBase game { get; set; }
 
         [Resolved(canBeNull: true)]
-        private DialogOverlay dialogOverlay { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; }
 
         protected override DirectoryInfo InitialPath => new DirectoryInfo(storage.GetFullPath(string.Empty)).Parent;
 

osu.Game/Overlays/Settings/Sections/Maintenance/StableDirectoryLocationDialog.cs

@@ -6,13 +6,14 @@ using osu.Framework.Allocation;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Screens;
 using osu.Game.Overlays.Dialog;
+using osu.Game.Screens;
 
 namespace osu.Game.Overlays.Settings.Sections.Maintenance
 {
     public class StableDirectoryLocationDialog : PopupDialog
     {
         [Resolved]
-        private OsuGame game { get; set; }
+        private IPerformFromScreenRunner performer { get; set; }
 
         public StableDirectoryLocationDialog(TaskCompletionSource<string> taskCompletionSource)
         {
@@ -25,7 +26,7 @@ namespace osu.Game.Overlays.Settings.Sections.Maintenance
                 new PopupDialogOkButton
                 {
                     Text = "Sure! I know where it is located!",
-                    Action = () => Schedule(() => game.PerformFromScreen(screen => screen.Push(new StableDirectorySelectScreen(taskCompletionSource))))
+                    Action = () => Schedule(() => performer.PerformFromScreen(screen => screen.Push(new StableDirectorySelectScreen(taskCompletionSource))))
                 },
                 new PopupDialogCancelButton
                 {

osu.Game/Overlays/Toolbar/ToolbarNotificationButton.cs

@@ -18,7 +18,7 @@ namespace osu.Game.Overlays.Toolbar
     {
         protected override Anchor TooltipAnchor => Anchor.TopRight;
 
-        public BindableInt NotificationCount = new BindableInt();
+        public IBindable<int> NotificationCount = new BindableInt();
 
         private readonly CountCircle countDisplay;
 
@@ -36,10 +36,10 @@ namespace osu.Game.Overlays.Toolbar
             });
         }
 
-        [BackgroundDependencyLoader(true)]
-        private void load(NotificationOverlay notificationOverlay)
+        [BackgroundDependencyLoader]
+        private void load(INotificationOverlay notificationOverlay)
         {
-            StateContainer = notificationOverlay;
+            StateContainer = notificationOverlay as NotificationOverlay;
 
             if (notificationOverlay != null)
                 NotificationCount.BindTo(notificationOverlay.UnreadCount);

osu.Game/PerformFromMenuRunner.cs

@@ -23,10 +23,10 @@ namespace osu.Game
         private readonly Func<IScreen> getCurrentScreen;
 
         [Resolved]
-        private NotificationOverlay notifications { get; set; }
+        private INotificationOverlay notifications { get; set; }
 
         [Resolved]
-        private DialogOverlay dialogOverlay { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; }
 
         [Resolved(canBeNull: true)]
         private OsuGame game { get; set; }

osu.Game/Screens/Edit/Editor.cs

@@ -84,10 +84,10 @@ namespace osu.Game.Screens.Edit
         private Storage storage { get; set; }
 
         [Resolved(canBeNull: true)]
-        private DialogOverlay dialogOverlay { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; }
 
         [Resolved(canBeNull: true)]
-        private NotificationOverlay notifications { get; set; }
+        private INotificationOverlay notifications { get; set; }
 
         public readonly Bindable<EditorScreenMode> Mode = new Bindable<EditorScreenMode>();
 

osu.Game/Screens/Edit/EditorBeatmapSkin.cs

@@ -21,21 +21,24 @@ namespace osu.Game.Screens.Edit
     {
         public event Action BeatmapSkinChanged;
 
+        /// <summary>
+        /// The underlying beatmap skin.
+        /// </summary>
+        protected internal readonly Skin Skin;
+
         /// <summary>
         /// The combo colours of this skin.
         /// If empty, the default combo colours will be used.
         /// </summary>
-        public readonly BindableList<Colour4> ComboColours;
-
-        private readonly Skin skin;
+        public BindableList<Colour4> ComboColours { get; }
 
         public EditorBeatmapSkin(Skin skin)
         {
-            this.skin = skin;
+            Skin = skin;
 
             ComboColours = new BindableList<Colour4>();
-            if (skin.Configuration.ComboColours != null)
-                ComboColours.AddRange(skin.Configuration.ComboColours.Select(c => (Colour4)c));
+            if (Skin.Configuration.ComboColours != null)
+                ComboColours.AddRange(Skin.Configuration.ComboColours.Select(c => (Colour4)c));
             ComboColours.BindCollectionChanged((_, __) => updateColours());
         }
 
@@ -43,16 +46,16 @@ namespace osu.Game.Screens.Edit
 
         private void updateColours()
         {
-            skin.Configuration.CustomComboColours = ComboColours.Select(c => (Color4)c).ToList();
+            Skin.Configuration.CustomComboColours = ComboColours.Select(c => (Color4)c).ToList();
             invokeSkinChanged();
         }
 
         #region Delegated ISkin implementation
 
-        public Drawable GetDrawableComponent(ISkinComponent component) => skin.GetDrawableComponent(component);
-        public Texture GetTexture(string componentName, WrapMode wrapModeS, WrapMode wrapModeT) => skin.GetTexture(componentName, wrapModeS, wrapModeT);
-        public ISample GetSample(ISampleInfo sampleInfo) => skin.GetSample(sampleInfo);
-        public IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup) => skin.GetConfig<TLookup, TValue>(lookup);
+        public Drawable GetDrawableComponent(ISkinComponent component) => Skin.GetDrawableComponent(component);
+        public Texture GetTexture(string componentName, WrapMode wrapModeS, WrapMode wrapModeT) => Skin.GetTexture(componentName, wrapModeS, wrapModeT);
+        public ISample GetSample(ISampleInfo sampleInfo) => Skin.GetSample(sampleInfo);
+        public IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup) => Skin.GetConfig<TLookup, TValue>(lookup);
 
         #endregion
     }

osu.Game/Screens/Edit/EditorSkinProvidingContainer.cs

@@ -16,7 +16,7 @@ namespace osu.Game.Screens.Edit
         private readonly EditorBeatmapSkin? beatmapSkin;
 
         public EditorSkinProvidingContainer(EditorBeatmap editorBeatmap)
-            : base(editorBeatmap.PlayableBeatmap.BeatmapInfo.Ruleset.CreateInstance(), editorBeatmap.PlayableBeatmap, editorBeatmap.BeatmapSkin)
+            : base(editorBeatmap.PlayableBeatmap.BeatmapInfo.Ruleset.CreateInstance(), editorBeatmap.PlayableBeatmap, editorBeatmap.BeatmapSkin?.Skin)
         {
             beatmapSkin = editorBeatmap.BeatmapSkin;
         }

osu.Game/Screens/IPerformFromScreenRunner.cs

@@ -0,0 +1,26 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using osu.Framework.Allocation;
+using osu.Framework.Screens;
+using osu.Game.Screens.Menu;
+
+namespace osu.Game.Screens
+{
+    /// <summary>
+    /// Manages a global screen stack to allow nested components a guarantee of where work is executed.
+    /// </summary>
+    [Cached]
+    public interface IPerformFromScreenRunner
+    {
+        /// <summary>
+        /// Perform an action only after returning to a specific screen as indicated by <paramref name="validScreens"/>.
+        /// Eagerly tries to exit the current screen until it succeeds.
+        /// </summary>
+        /// <param name="action">The action to perform once we are in the correct state.</param>
+        /// <param name="validScreens">An optional collection of valid screen types. If any of these screens are already current we can perform the action immediately, else the first valid parent will be made current before performing the action. <see cref="MainMenu"/> is used if not specified.</param>
+        void PerformFromScreen(Action<IScreen> action, IEnumerable<Type> validScreens = null);
+    }
+}

osu.Game/Screens/Menu/ButtonSystem.cs

@@ -26,7 +26,6 @@ using osu.Game.Input.Bindings;
 using osu.Game.Localisation;
 using osu.Game.Online.API;
 using osu.Game.Overlays;
-using osu.Game.Overlays.Notifications;
 using osuTK;
 using osuTK.Graphics;
 using osuTK.Input;
@@ -117,9 +116,6 @@ namespace osu.Game.Screens.Menu
         [Resolved]
         private IAPIProvider api { get; set; }
 
-        [Resolved(CanBeNull = true)]
-        private NotificationOverlay notifications { get; set; }
-
         [Resolved(CanBeNull = true)]
         private LoginOverlay loginOverlay { get; set; }
 
@@ -161,17 +157,7 @@ namespace osu.Game.Screens.Menu
         {
             if (api.State.Value != APIState.Online)
             {
-                notifications?.Post(new SimpleNotification
-                {
-                    Text = "You gotta be online to multi 'yo!",
-                    Icon = FontAwesome.Solid.Globe,
-                    Activated = () =>
-                    {
-                        loginOverlay?.Show();
-                        return true;
-                    }
-                });
-
+                loginOverlay?.Show();
                 return;
             }
 
@@ -182,17 +168,7 @@ namespace osu.Game.Screens.Menu
         {
             if (api.State.Value != APIState.Online)
             {
-                notifications?.Post(new SimpleNotification
-                {
-                    Text = "You gotta be online to view playlists 'yo!",
-                    Icon = FontAwesome.Solid.Globe,
-                    Activated = () =>
-                    {
-                        loginOverlay?.Show();
-                        return true;
-                    }
-                });
-
+                loginOverlay?.Show();
                 return;
             }
 

osu.Game/Screens/Menu/IntroScreen.cs

@@ -171,7 +171,7 @@ namespace osu.Game.Screens.Menu
         }
 
         [Resolved]
-        private NotificationOverlay notifications { get; set; }
+        private INotificationOverlay notifications { get; set; }
 
         private void ensureEventuallyArrivingAtMenu()
         {

osu.Game/Screens/Menu/MainMenu.cs

@@ -60,7 +60,7 @@ namespace osu.Game.Screens.Menu
         private IAPIProvider api { get; set; }
 
         [Resolved(canBeNull: true)]
-        private DialogOverlay dialogOverlay { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; }
 
         private BackgroundScreenDefault background;
 
@@ -148,14 +148,14 @@ namespace osu.Game.Screens.Menu
         }
 
         [Resolved(canBeNull: true)]
-        private OsuGame game { get; set; }
+        private IPerformFromScreenRunner performer { get; set; }
 
         private void confirmAndExit()
         {
             if (exitConfirmed) return;
 
             exitConfirmed = true;
-            game?.PerformFromScreen(menu => menu.Exit());
+            performer?.PerformFromScreen(menu => menu.Exit());
         }
 
         private void preloadSongSelect()

osu.Game/Screens/Menu/StorageErrorDialog.cs

@@ -13,7 +13,7 @@ namespace osu.Game.Screens.Menu
     public class StorageErrorDialog : PopupDialog
     {
         [Resolved]
-        private DialogOverlay dialogOverlay { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; }
 
         public StorageErrorDialog(OsuStorage storage, OsuStorageError error)
         {

osu.Game/Screens/OnlinePlay/Multiplayer/MultiplayerMatchSubScreen.cs

@@ -238,7 +238,7 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer
         }
 
         [Resolved(canBeNull: true)]
-        private DialogOverlay dialogOverlay { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; }
 
         private bool exitConfirmed;
 

osu.Game/Screens/Play/HUDOverlay.cs

@@ -119,7 +119,7 @@ namespace osu.Game.Screens.Play
         }
 
         [BackgroundDependencyLoader(true)]
-        private void load(OsuConfigManager config, NotificationOverlay notificationOverlay)
+        private void load(OsuConfigManager config, INotificationOverlay notificationOverlay)
         {
             if (drawableRuleset != null)
             {

osu.Game/Screens/Play/PlayerLoader.cs

@@ -124,7 +124,7 @@ namespace osu.Game.Screens.Play
         private EpilepsyWarning? epilepsyWarning;
 
         [Resolved(CanBeNull = true)]
-        private NotificationOverlay? notificationOverlay { get; set; }
+        private INotificationOverlay? notificationOverlay { get; set; }
 
         [Resolved(CanBeNull = true)]
         private VolumeOverlay? volumeOverlay { get; set; }
@@ -515,7 +515,7 @@ namespace osu.Game.Screens.Play
             }
 
             [BackgroundDependencyLoader]
-            private void load(OsuColour colours, AudioManager audioManager, NotificationOverlay notificationOverlay, VolumeOverlay volumeOverlay)
+            private void load(OsuColour colours, AudioManager audioManager, INotificationOverlay notificationOverlay, VolumeOverlay volumeOverlay)
             {
                 Icon = FontAwesome.Solid.VolumeMute;
                 IconBackground.Colour = colours.RedDark;
@@ -567,7 +567,7 @@ namespace osu.Game.Screens.Play
             }
 
             [BackgroundDependencyLoader]
-            private void load(OsuColour colours, NotificationOverlay notificationOverlay)
+            private void load(OsuColour colours, INotificationOverlay notificationOverlay)
             {
                 Icon = FontAwesome.Solid.BatteryQuarter;
                 IconBackground.Colour = colours.RedDark;

osu.Game/Screens/Select/Carousel/DrawableCarouselBeatmapSet.cs

@@ -28,7 +28,7 @@ namespace osu.Game.Screens.Select.Carousel
         private Action<int> viewDetails;
 
         [Resolved(CanBeNull = true)]
-        private DialogOverlay dialogOverlay { get; set; }
+        private IDialogOverlay dialogOverlay { get; set; }
 
         [Resolved(CanBeNull = true)]
         private CollectionManager collectionManager { get; set; }

osu.Game/Screens/Select/PlaySongSelect.cs

@@ -25,7 +25,7 @@ namespace osu.Game.Screens.Select
         private OsuScreen playerLoader;
 
         [Resolved(CanBeNull = true)]
-        private NotificationOverlay notifications { get; set; }
+        private INotificationOverlay notifications { get; set; }
 
         public override bool AllowExternalScreenChange => true;
 

osu.Game/Screens/Select/SongSelect.cs

@@ -87,7 +87,7 @@ namespace osu.Game.Screens.Select
         protected Container LeftArea { get; private set; }
 
         private BeatmapInfoWedge beatmapInfoWedge;
-        private DialogOverlay dialogOverlay;
+        private IDialogOverlay dialogOverlay;
 
         [Resolved]
         private BeatmapManager beatmaps { get; set; }
@@ -114,7 +114,7 @@ namespace osu.Game.Screens.Select
         private MusicController music { get; set; }
 
         [BackgroundDependencyLoader(true)]
-        private void load(AudioManager audio, DialogOverlay dialog, OsuColour colours, ManageCollectionsDialog manageCollectionsDialog, DifficultyRecommender recommender)
+        private void load(AudioManager audio, IDialogOverlay dialog, OsuColour colours, ManageCollectionsDialog manageCollectionsDialog, DifficultyRecommender recommender)
         {
             // initial value transfer is required for FilterControl (it uses our re-cached bindables in its async load for the initial filter).
             transferRulesetValue();

osu.Game/Skinning/Editor/SkinEditorSceneLibrary.cs

@@ -15,6 +15,7 @@ using osu.Game.Graphics.UserInterface;
 using osu.Game.Overlays;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Mods;
+using osu.Game.Screens;
 using osu.Game.Screens.Play;
 using osu.Game.Screens.Select;
 using osuTK;
@@ -28,7 +29,7 @@ namespace osu.Game.Skinning.Editor
         private const float padding = 10;
 
         [Resolved(canBeNull: true)]
-        private OsuGame game { get; set; }
+        private IPerformFromScreenRunner performer { get; set; }
 
         [Resolved]
         private IBindable<RulesetInfo> ruleset { get; set; }
@@ -75,7 +76,7 @@ namespace osu.Game.Skinning.Editor
                                     Text = "Song Select",
                                     Anchor = Anchor.CentreLeft,
                                     Origin = Anchor.CentreLeft,
-                                    Action = () => game?.PerformFromScreen(screen =>
+                                    Action = () => performer?.PerformFromScreen(screen =>
                                     {
                                         if (screen is SongSelect)
                                             return;
@@ -88,7 +89,7 @@ namespace osu.Game.Skinning.Editor
                                     Text = "Gameplay",
                                     Anchor = Anchor.CentreLeft,
                                     Origin = Anchor.CentreLeft,
-                                    Action = () => game?.PerformFromScreen(screen =>
+                                    Action = () => performer?.PerformFromScreen(screen =>
                                     {
                                         if (screen is Player)
                                             return;

osu.Game/Tests/Visual/EditorTestScene.cs

@@ -98,7 +98,7 @@ namespace osu.Game.Tests.Visual
         {
             [Resolved(canBeNull: true)]
             [CanBeNull]
-            private DialogOverlay dialogOverlay { get; set; }
+            private IDialogOverlay dialogOverlay { get; set; }
 
             public new void Undo() => base.Undo();
 

osu.Game/Tests/Visual/ScreenTestScene.cs

@@ -23,7 +23,7 @@ namespace osu.Game.Tests.Visual
 
         protected override Container<Drawable> Content => content;
 
-        [Cached]
+        [Cached(typeof(IDialogOverlay))]
         protected DialogOverlay DialogOverlay { get; private set; }
 
         protected ScreenTestScene()

osu.Game/Updater/UpdateManager.cs

@@ -31,7 +31,7 @@ namespace osu.Game.Updater
         private OsuGameBase game { get; set; }
 
         [Resolved]
-        protected NotificationOverlay Notifications { get; private set; }
+        protected INotificationOverlay Notifications { get; private set; }
 
         protected override void LoadComplete()
         {
@@ -94,7 +94,7 @@ namespace osu.Game.Updater
             }
 
             [BackgroundDependencyLoader]
-            private void load(OsuColour colours, ChangelogOverlay changelog, NotificationOverlay notificationOverlay)
+            private void load(OsuColour colours, ChangelogOverlay changelog, INotificationOverlay notificationOverlay)
             {
                 Icon = FontAwesome.Solid.CheckSquare;
                 IconBackground.Colour = colours.BlueDark;

osu.Game/osu.Game.csproj

@@ -35,7 +35,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Realm" Version="10.10.0" />
-    <PackageReference Include="ppy.osu.Framework" Version="2022.415.0" />
+    <PackageReference Include="ppy.osu.Framework" Version="2022.419.0" />
     <PackageReference Include="ppy.osu.Game.Resources" Version="2022.417.0" />
     <PackageReference Include="Sentry" Version="3.14.1" />
     <PackageReference Include="SharpCompress" Version="0.30.1" />

osu.iOS.props

@@ -61,7 +61,7 @@
     <Reference Include="System.Net.Http" />
   </ItemGroup>
   <ItemGroup Label="Package References">
-    <PackageReference Include="ppy.osu.Framework.iOS" Version="2022.415.0" />
+    <PackageReference Include="ppy.osu.Framework.iOS" Version="2022.419.0" />
     <PackageReference Include="ppy.osu.Game.Resources" Version="2022.417.0" />
   </ItemGroup>
   <!-- See https://github.com/dotnet/runtime/issues/35988 (can be removed after Xamarin uses net6.0) -->
@@ -84,7 +84,7 @@
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="5.0.14" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite.Core" Version="5.0.14" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
-    <PackageReference Include="ppy.osu.Framework" Version="2022.415.0" />
+    <PackageReference Include="ppy.osu.Framework" Version="2022.419.0" />
     <PackageReference Include="SharpCompress" Version="0.30.1" />
     <PackageReference Include="NUnit" Version="3.13.2" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />