Merge branch 'master' into pooling-editor-support

osu.Android.props

@@ -52,6 +52,6 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="ppy.osu.Game.Resources" Version="2020.1030.0" />
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2020.1111.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2020.1113.0" />
   </ItemGroup>
 </Project>

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

@@ -125,6 +125,9 @@ namespace osu.Game.Rulesets.Osu.Tests
             {
                 if (!enabled) return null;
 
+                if (component is OsuSkinComponent osuComponent && osuComponent.Component == OsuSkinComponents.SliderBody)
+                    return null;
+
                 return new OsuSpriteText
                 {
                     Text = identifier,

osu.Game.Rulesets.Osu/Edit/OsuSelectionHandler.cs

@@ -21,12 +21,12 @@ namespace osu.Game.Rulesets.Osu.Edit
         {
             base.OnSelectionChanged();
 
-            bool canOperate = EditorBeatmap.SelectedHitObjects.Count > 1 || EditorBeatmap.SelectedHitObjects.Any(s => s is Slider);
+            Quad quad = selectedMovableObjects.Length > 0 ? getSurroundingQuad(selectedMovableObjects) : new Quad();
 
-            SelectionBox.CanRotate = canOperate;
+            SelectionBox.CanRotate = quad.Width > 0 || quad.Height > 0;
-            SelectionBox.CanScaleX = canOperate;
+            SelectionBox.CanScaleX = quad.Width > 0;
-            SelectionBox.CanScaleY = canOperate;
+            SelectionBox.CanScaleY = quad.Height > 0;
-            SelectionBox.CanReverse = canOperate;
+            SelectionBox.CanReverse = EditorBeatmap.SelectedHitObjects.Count > 1 || EditorBeatmap.SelectedHitObjects.Any(s => s is Slider);
         }
 
         protected override void OnOperationEnded()

osu.Game.Rulesets.Osu/Mods/OsuModHidden.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using osu.Framework.Graphics;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Objects;
@@ -46,9 +47,6 @@ namespace osu.Game.Rulesets.Osu.Mods
                 applyFadeInAdjustment(nested);
         }
 
-        private double lastSliderHeadFadeOutStartTime;
-        private double lastSliderHeadFadeOutDuration;
-
         protected override void ApplyIncreasedVisibilityState(DrawableHitObject hitObject, ArmedState state)
         {
             base.ApplyIncreasedVisibilityState(hitObject, state);
@@ -78,33 +76,24 @@ namespace osu.Game.Rulesets.Osu.Mods
             {
                 case DrawableSliderTail sliderTail:
                     // use stored values from head circle to achieve same fade sequence.
-                    fadeOutDuration = lastSliderHeadFadeOutDuration;
+                    var tailFadeOutParameters = getFadeOutParametersFromSliderHead(h);
-                    fadeOutStartTime = lastSliderHeadFadeOutStartTime;
 
-                    using (drawable.BeginAbsoluteSequence(fadeOutStartTime, true))
+                    using (drawable.BeginAbsoluteSequence(tailFadeOutParameters.startTime, true))
-                        sliderTail.FadeOut(fadeOutDuration);
+                        sliderTail.FadeOut(tailFadeOutParameters.duration);
 
                     break;
 
                 case DrawableSliderRepeat sliderRepeat:
                     // use stored values from head circle to achieve same fade sequence.
-                    fadeOutDuration = lastSliderHeadFadeOutDuration;
+                    var repeatFadeOutParameters = getFadeOutParametersFromSliderHead(h);
-                    fadeOutStartTime = lastSliderHeadFadeOutStartTime;
 
-                    using (drawable.BeginAbsoluteSequence(fadeOutStartTime, true))
+                    using (drawable.BeginAbsoluteSequence(repeatFadeOutParameters.startTime, true))
                         // only apply to circle piece – reverse arrow is not affected by hidden.
-                        sliderRepeat.CirclePiece.FadeOut(fadeOutDuration);
+                        sliderRepeat.CirclePiece.FadeOut(repeatFadeOutParameters.duration);
 
                     break;
 
                 case DrawableHitCircle circle:
-
-                    if (circle is DrawableSliderHead)
-                    {
-                        lastSliderHeadFadeOutDuration = fadeOutDuration;
-                        lastSliderHeadFadeOutStartTime = fadeOutStartTime;
-                    }
-
                     Drawable fadeTarget = circle;
 
                     if (increaseVisibility)
@@ -125,6 +114,8 @@ namespace osu.Game.Rulesets.Osu.Mods
                     break;
 
                 case DrawableSlider slider:
+                    associateNestedSliderCirclesWithHead(slider.HitObject);
+
                     using (slider.BeginAbsoluteSequence(fadeOutStartTime, true))
                         slider.Body.FadeOut(longFadeDuration, Easing.Out);
 
@@ -149,5 +140,24 @@ namespace osu.Game.Rulesets.Osu.Mods
                     break;
             }
         }
+
+        private readonly Dictionary<HitObject, SliderHeadCircle> correspondingSliderHeadForObject = new Dictionary<HitObject, SliderHeadCircle>();
+
+        private void associateNestedSliderCirclesWithHead(Slider slider)
+        {
+            var sliderHead = slider.NestedHitObjects.Single(obj => obj is SliderHeadCircle);
+
+            foreach (var nested in slider.NestedHitObjects)
+            {
+                if ((nested is SliderRepeat || nested is SliderEndCircle) && !correspondingSliderHeadForObject.ContainsKey(nested))
+                    correspondingSliderHeadForObject[nested] = (SliderHeadCircle)sliderHead;
+            }
+        }
+
+        private (double startTime, double duration) getFadeOutParametersFromSliderHead(OsuHitObject h)
+        {
+            var sliderHead = correspondingSliderHeadForObject[h];
+            return (sliderHead.StartTime - sliderHead.TimePreempt + sliderHead.TimeFadeIn, sliderHead.TimePreempt * fade_out_duration_multiplier);
+        }
     }
 }

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

@@ -142,6 +142,8 @@ namespace osu.Game.Tests.Visual.Gameplay
 
             protected override HitObjectLifetimeEntry CreateLifetimeEntry(TestHitObject hitObject) => new TestHitObjectLifetimeEntry(hitObject);
 
+            public override DrawableHitObject<TestHitObject> CreateDrawableRepresentation(TestHitObject h) => null;
+
             protected override PassThroughInputManager CreateInputManager() => new PassThroughInputManager();
 
             protected override Playfield CreatePlayfield() => new TestPlayfield();

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

@@ -49,7 +49,7 @@ namespace osu.Game.Tests.Visual.Navigation
         }
 
         [SetUpSteps]
-        public void SetUpSteps()
+        public virtual void SetUpSteps()
         {
             AddStep("Create new game instance", () =>
             {

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

@@ -2,23 +2,33 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Screens;
+using osu.Game.Overlays;
+using osu.Game.Screens;
 using osu.Game.Screens.Menu;
 using osu.Game.Screens.Play;
 using osu.Game.Screens.Select;
+using osuTK.Input;
 
 namespace osu.Game.Tests.Visual.Navigation
 {
     public class TestScenePerformFromScreen : OsuGameTestScene
     {
+        private bool actionPerformed;
+
+        public override void SetUpSteps()
+        {
+            AddStep("reset status", () => actionPerformed = false);
+
+            base.SetUpSteps();
+        }
+
         [Test]
         public void TestPerformAtMenu()
         {
-            AddAssert("could perform immediately", () =>
+            AddStep("perform immediately", () => Game.PerformFromScreen(_ => actionPerformed = true));
-            {
+            AddAssert("did perform", () => actionPerformed);
-                bool actionPerformed = false;
-                Game.PerformFromScreen(_ => actionPerformed = true);
-                return actionPerformed;
-            });
         }
 
         [Test]
@@ -26,12 +36,9 @@ namespace osu.Game.Tests.Visual.Navigation
         {
             PushAndConfirm(() => new PlaySongSelect());
 
-            AddAssert("could perform immediately", () =>
+            AddStep("perform immediately", () => Game.PerformFromScreen(_ => actionPerformed = true, new[] { typeof(PlaySongSelect) }));
-            {
+            AddAssert("did perform", () => actionPerformed);
-                bool actionPerformed = false;
+            AddAssert("screen didn't change", () => Game.ScreenStack.CurrentScreen is PlaySongSelect);
-                Game.PerformFromScreen(_ => actionPerformed = true, new[] { typeof(PlaySongSelect) });
-                return actionPerformed;
-            });
         }
 
         [Test]
@@ -39,7 +46,6 @@ namespace osu.Game.Tests.Visual.Navigation
         {
             PushAndConfirm(() => new PlaySongSelect());
 
-            bool actionPerformed = false;
             AddStep("try to perform", () => Game.PerformFromScreen(_ => actionPerformed = true));
             AddUntilStep("returned to menu", () => Game.ScreenStack.CurrentScreen is MainMenu);
             AddAssert("did perform", () => actionPerformed);
@@ -51,7 +57,6 @@ namespace osu.Game.Tests.Visual.Navigation
             PushAndConfirm(() => new PlaySongSelect());
             PushAndConfirm(() => new PlayerLoader(() => new Player()));
 
-            bool actionPerformed = false;
             AddStep("try to perform", () => Game.PerformFromScreen(_ => actionPerformed = true, new[] { typeof(PlaySongSelect) }));
             AddUntilStep("returned to song select", () => Game.ScreenStack.CurrentScreen is PlaySongSelect);
             AddAssert("did perform", () => actionPerformed);
@@ -63,10 +68,105 @@ namespace osu.Game.Tests.Visual.Navigation
             PushAndConfirm(() => new PlaySongSelect());
             PushAndConfirm(() => new PlayerLoader(() => new Player()));
 
-            bool actionPerformed = false;
             AddStep("try to perform", () => Game.PerformFromScreen(_ => actionPerformed = true));
             AddUntilStep("returned to song select", () => Game.ScreenStack.CurrentScreen is MainMenu);
             AddAssert("did perform", () => actionPerformed);
         }
+
+        [TestCase(true)]
+        [TestCase(false)]
+        public void TestPerformBlockedByDialog(bool confirmed)
+        {
+            DialogBlockingScreen blocker = null;
+
+            PushAndConfirm(() => blocker = new DialogBlockingScreen());
+            AddStep("try to perform", () => Game.PerformFromScreen(_ => actionPerformed = true));
+
+            AddWaitStep("wait a bit", 10);
+
+            AddAssert("screen didn't change", () => Game.ScreenStack.CurrentScreen is DialogBlockingScreen);
+            AddAssert("did not perform", () => !actionPerformed);
+            AddAssert("only one exit attempt", () => blocker.ExitAttempts == 1);
+
+            AddUntilStep("wait for dialog display", () => Game.Dependencies.Get<DialogOverlay>().IsLoaded);
+
+            if (confirmed)
+            {
+                AddStep("accept dialog", () => InputManager.Key(Key.Number1));
+                AddUntilStep("wait for dialog dismissed", () => Game.Dependencies.Get<DialogOverlay>().CurrentDialog == null);
+                AddUntilStep("did perform", () => actionPerformed);
+            }
+            else
+            {
+                AddStep("cancel dialog", () => InputManager.Key(Key.Number2));
+                AddAssert("screen didn't change", () => Game.ScreenStack.CurrentScreen is DialogBlockingScreen);
+                AddAssert("did not perform", () => !actionPerformed);
+            }
+        }
+
+        [TestCase(true)]
+        [TestCase(false)]
+        public void TestPerformBlockedByDialogNested(bool confirmSecond)
+        {
+            DialogBlockingScreen blocker = null;
+            DialogBlockingScreen blocker2 = null;
+
+            PushAndConfirm(() => blocker = new DialogBlockingScreen());
+            PushAndConfirm(() => blocker2 = new DialogBlockingScreen());
+
+            AddStep("try to perform", () => Game.PerformFromScreen(_ => actionPerformed = true));
+
+            AddUntilStep("wait for dialog", () => blocker2.ExitAttempts == 1);
+
+            AddWaitStep("wait a bit", 10);
+
+            AddUntilStep("wait for dialog display", () => Game.Dependencies.Get<DialogOverlay>().IsLoaded);
+
+            AddAssert("screen didn't change", () => Game.ScreenStack.CurrentScreen == blocker2);
+            AddAssert("did not perform", () => !actionPerformed);
+            AddAssert("only one exit attempt", () => blocker2.ExitAttempts == 1);
+
+            AddStep("accept dialog", () => InputManager.Key(Key.Number1));
+            AddUntilStep("screen changed", () => Game.ScreenStack.CurrentScreen == blocker);
+
+            AddUntilStep("wait for second dialog", () => blocker.ExitAttempts == 1);
+            AddAssert("did not perform", () => !actionPerformed);
+            AddAssert("only one exit attempt", () => blocker.ExitAttempts == 1);
+
+            if (confirmSecond)
+            {
+                AddStep("accept dialog", () => InputManager.Key(Key.Number1));
+                AddUntilStep("did perform", () => actionPerformed);
+            }
+            else
+            {
+                AddStep("cancel dialog", () => InputManager.Key(Key.Number2));
+                AddAssert("screen didn't change", () => Game.ScreenStack.CurrentScreen == blocker);
+                AddAssert("did not perform", () => !actionPerformed);
+            }
+        }
+
+        public class DialogBlockingScreen : OsuScreen
+        {
+            [Resolved]
+            private DialogOverlay dialogOverlay { get; set; }
+
+            private int dialogDisplayCount;
+
+            public int ExitAttempts { get; private set; }
+
+            public override bool OnExiting(IScreen next)
+            {
+                ExitAttempts++;
+
+                if (dialogDisplayCount++ < 1)
+                {
+                    dialogOverlay.Push(new ConfirmExitDialog(this.Exit, () => { }));
+                    return true;
+                }
+
+                return base.OnExiting(next);
+            }
+        }
     }
 }

osu.Game.Tests/Visual/Ranking/TestSceneStatisticsPanel.cs

@@ -1,19 +1,24 @@
 // 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 NUnit.Framework;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Game.Rulesets.Osu;
 using osu.Game.Scoring;
 using osu.Game.Screens.Ranking.Statistics;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Scoring;
+using osuTK;
 
 namespace osu.Game.Tests.Visual.Ranking
 {
     public class TestSceneStatisticsPanel : OsuTestScene
     {
         [Test]
-        public void TestScoreWithStatistics()
+        public void TestScoreWithTimeStatistics()
         {
             var score = new TestScoreInfo(new OsuRuleset().RulesetInfo)
             {
@@ -23,6 +28,17 @@ namespace osu.Game.Tests.Visual.Ranking
             loadPanel(score);
         }
 
+        [Test]
+        public void TestScoreWithPositionStatistics()
+        {
+            var score = new TestScoreInfo(new OsuRuleset().RulesetInfo)
+            {
+                HitEvents = createPositionDistributedHitEvents()
+            };
+
+            loadPanel(score);
+        }
+
         [Test]
         public void TestScoreWithoutStatistics()
         {
@@ -44,5 +60,24 @@ namespace osu.Game.Tests.Visual.Ranking
                 Score = { Value = score }
             };
         });
+
+        private static List<HitEvent> createPositionDistributedHitEvents()
+        {
+            var hitEvents = new List<HitEvent>();
+            // Use constant seed for reproducibility
+            var random = new Random(0);
+
+            for (int i = 0; i < 500; i++)
+            {
+                double angle = random.NextDouble() * 2 * Math.PI;
+                double radius = random.NextDouble() * 0.5f * OsuHitObject.OBJECT_RADIUS;
+
+                var position = new Vector2((float)(radius * Math.Cos(angle)), (float)(radius * Math.Sin(angle)));
+
+                hitEvents.Add(new HitEvent(0, HitResult.Perfect, new HitCircle(), new HitCircle(), position));
+            }
+
+            return hitEvents;
+        }
     }
 }

osu.Game/Beatmaps/Formats/LegacyBeatmapDecoder.cs

@@ -16,8 +16,6 @@ namespace osu.Game.Beatmaps.Formats
 {
     public class LegacyBeatmapDecoder : LegacyDecoder<Beatmap>
     {
-        public const int LATEST_VERSION = 14;
-
         private Beatmap beatmap;
 
         private ConvertHitObjectParser parser;

osu.Game/Beatmaps/Formats/LegacyDecoder.cs

@@ -16,6 +16,8 @@ namespace osu.Game.Beatmaps.Formats
     public abstract class LegacyDecoder<T> : Decoder<T>
         where T : new()
     {
+        public const int LATEST_VERSION = 14;
+
         protected readonly int FormatVersion;
 
         protected LegacyDecoder(int version)

osu.Game/Beatmaps/Formats/LegacyStoryboardDecoder.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using osu.Framework.Graphics;
 using osu.Framework.Utils;
 using osu.Game.Beatmaps.Legacy;
@@ -23,15 +24,15 @@ namespace osu.Game.Beatmaps.Formats
 
         private readonly Dictionary<string, string> variables = new Dictionary<string, string>();
 
-        public LegacyStoryboardDecoder()
+        public LegacyStoryboardDecoder(int version = LATEST_VERSION)
-            : base(0)
+            : base(version)
         {
         }
 
         public static void Register()
         {
             // note that this isn't completely correct
-            AddDecoder<Storyboard>(@"osu file format v", m => new LegacyStoryboardDecoder());
+            AddDecoder<Storyboard>(@"osu file format v", m => new LegacyStoryboardDecoder(Parsing.ParseInt(m.Split('v').Last())));
             AddDecoder<Storyboard>(@"[Events]", m => new LegacyStoryboardDecoder());
             SetFallbackDecoder<Storyboard>(() => new LegacyStoryboardDecoder());
         }
@@ -133,6 +134,11 @@ namespace osu.Game.Beatmaps.Formats
                         var y = Parsing.ParseFloat(split[5], Parsing.MAX_COORDINATE_VALUE);
                         var frameCount = Parsing.ParseInt(split[6]);
                         var frameDelay = Parsing.ParseDouble(split[7]);
+
+                        if (FormatVersion < 6)
+                            // this is random as hell but taken straight from osu-stable.
+                            frameDelay = Math.Round(0.015 * frameDelay) * 1.186 * (1000 / 60f);
+
                         var loopType = split.Length > 8 ? (AnimationLoopType)Enum.Parse(typeof(AnimationLoopType), split[8]) : AnimationLoopType.LoopForever;
                         storyboardSprite = new StoryboardAnimation(path, origin, new Vector2(x, y), frameCount, frameDelay, loopType);
                         storyboard.GetLayer(layer).Add(storyboardSprite);

osu.Game/OsuGame.cs

@@ -463,7 +463,7 @@ namespace osu.Game
 
         #endregion
 
-        private ScheduledDelegate performFromMainMenuTask;
+        private PerformFromMenuRunner performFromMainMenuTask;
 
         /// <summary>
         /// Perform an action only after returning to a specific screen as indicated by <paramref name="validScreens"/>.
@@ -474,34 +474,7 @@ namespace osu.Game
         public void PerformFromScreen(Action<IScreen> action, IEnumerable<Type> validScreens = null)
         {
             performFromMainMenuTask?.Cancel();
-
+            Add(performFromMainMenuTask = new PerformFromMenuRunner(action, validScreens, () => ScreenStack.CurrentScreen));
-            validScreens ??= Enumerable.Empty<Type>();
-            validScreens = validScreens.Append(typeof(MainMenu));
-
-            CloseAllOverlays(false);
-
-            // we may already be at the target screen type.
-            if (validScreens.Contains(ScreenStack.CurrentScreen?.GetType()) && !Beatmap.Disabled)
-            {
-                action(ScreenStack.CurrentScreen);
-                return;
-            }
-
-            // find closest valid target
-            IScreen screen = ScreenStack.CurrentScreen;
-
-            while (screen != null)
-            {
-                if (validScreens.Contains(screen.GetType()))
-                {
-                    screen.MakeCurrent();
-                    break;
-                }
-
-                screen = screen.GetParentScreen();
-            }
-
-            performFromMainMenuTask = Schedule(() => PerformFromScreen(action, validScreens));
         }
 
         /// <summary>

osu.Game/PerformFromMenuRunner.cs

@@ -0,0 +1,145 @@
+// 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.Linq;
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Screens;
+using osu.Framework.Threading;
+using osu.Game.Beatmaps;
+using osu.Game.Overlays;
+using osu.Game.Overlays.Dialog;
+using osu.Game.Overlays.Notifications;
+using osu.Game.Screens.Menu;
+
+namespace osu.Game
+{
+    internal class PerformFromMenuRunner : Component
+    {
+        private readonly Action<IScreen> finalAction;
+        private readonly Type[] validScreens;
+        private readonly Func<IScreen> getCurrentScreen;
+
+        [Resolved]
+        private NotificationOverlay notifications { get; set; }
+
+        [Resolved]
+        private DialogOverlay dialogOverlay { get; set; }
+
+        [Resolved]
+        private IBindable<WorkingBeatmap> beatmap { get; set; }
+
+        [Resolved(canBeNull: true)]
+        private OsuGame game { get; set; }
+
+        private readonly ScheduledDelegate task;
+
+        private PopupDialog lastEncounteredDialog;
+        private IScreen lastEncounteredDialogScreen;
+
+        /// <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="finalAction">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>
+        /// <param name="getCurrentScreen">A function to retrieve the currently displayed game screen.</param>
+        public PerformFromMenuRunner(Action<IScreen> finalAction, IEnumerable<Type> validScreens, Func<IScreen> getCurrentScreen)
+        {
+            validScreens ??= Enumerable.Empty<Type>();
+            validScreens = validScreens.Append(typeof(MainMenu));
+
+            this.finalAction = finalAction;
+            this.validScreens = validScreens.ToArray();
+            this.getCurrentScreen = getCurrentScreen;
+
+            Scheduler.Add(task = new ScheduledDelegate(checkCanComplete, 0, 200));
+        }
+
+        /// <summary>
+        /// Cancel this runner from running.
+        /// </summary>
+        public void Cancel()
+        {
+            task.Cancel();
+            Expire();
+        }
+
+        private void checkCanComplete()
+        {
+            // find closest valid target
+            IScreen current = getCurrentScreen();
+
+            // a dialog may be blocking the execution for now.
+            if (checkForDialog(current)) return;
+
+            // we may already be at the target screen type.
+            if (validScreens.Contains(getCurrentScreen().GetType()) && !beatmap.Disabled)
+            {
+                complete();
+                return;
+            }
+
+            game.CloseAllOverlays(false);
+
+            while (current != null)
+            {
+                if (validScreens.Contains(current.GetType()))
+                {
+                    current.MakeCurrent();
+                    break;
+                }
+
+                current = current.GetParentScreen();
+            }
+        }
+
+        /// <summary>
+        /// Check whether there is currently a dialog requiring user interaction.
+        /// </summary>
+        /// <param name="current"></param>
+        /// <returns>Whether a dialog blocked interaction.</returns>
+        private bool checkForDialog(IScreen current)
+        {
+            var currentDialog = dialogOverlay.CurrentDialog;
+
+            if (lastEncounteredDialog != null)
+            {
+                if (lastEncounteredDialog == currentDialog)
+                    // still waiting on user interaction
+                    return true;
+
+                if (lastEncounteredDialogScreen != current)
+                {
+                    // a dialog was previously encountered but has since been dismissed.
+                    // if the screen changed, the user likely confirmed an exit dialog and we should continue attempting the action.
+                    lastEncounteredDialog = null;
+                    lastEncounteredDialogScreen = null;
+                    return false;
+                }
+
+                // the last dialog encountered has been dismissed but the screen has not changed, abort.
+                Cancel();
+                notifications.Post(new SimpleNotification { Text = @"An action was interrupted due to a dialog being displayed." });
+                return true;
+            }
+
+            if (currentDialog == null)
+                return false;
+
+            // a new dialog was encountered.
+            lastEncounteredDialog = currentDialog;
+            lastEncounteredDialogScreen = current;
+            return true;
+        }
+
+        private void complete()
+        {
+            finalAction(getCurrentScreen());
+            Cancel();
+        }
+    }
+}

osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs

@@ -10,6 +10,7 @@ using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Extensions.TypeExtensions;
 using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Primitives;
 using osu.Framework.Logging;
 using osu.Framework.Threading;
@@ -134,6 +135,8 @@ namespace osu.Game.Rulesets.Objects.Drawables
         [CanBeNull]
         private HitObjectLifetimeEntry lifetimeEntry;
 
+        private Container<PausableSkinnableSound> samplesContainer;
+
         /// <summary>
         /// Creates a new <see cref="DrawableHitObject"/>.
         /// </summary>
@@ -150,6 +153,9 @@ namespace osu.Game.Rulesets.Objects.Drawables
         private void load(OsuConfigManager config)
         {
             config.BindWith(OsuSetting.PositionalHitSounds, userPositionalHitSounds);
+
+            // Explicit non-virtual function call.
+            base.AddInternal(samplesContainer = new Container<PausableSkinnableSound> { RelativeSizeAxes = Axes.Both });
         }
 
         protected override void LoadAsyncComplete()
@@ -164,7 +170,6 @@ namespace osu.Game.Rulesets.Objects.Drawables
         {
             base.LoadComplete();
 
-            StartTimeBindable.BindValueChanged(_ => updateState(State.Value, true));
             comboIndexBindable.BindValueChanged(_ => updateComboColour(), true);
 
             updateState(ArmedState.Idle, true);
@@ -214,6 +219,8 @@ namespace osu.Game.Rulesets.Objects.Drawables
             }
 
             StartTimeBindable.BindTo(HitObject.StartTimeBindable);
+            StartTimeBindable.BindValueChanged(onStartTimeChanged);
+
             if (HitObject is IHasComboInformation combo)
                 comboIndexBindable.BindTo(combo.ComboIndexBindable);
 
@@ -243,9 +250,11 @@ namespace osu.Game.Rulesets.Objects.Drawables
             StartTimeBindable.UnbindFrom(HitObject.StartTimeBindable);
             if (HitObject is IHasComboInformation combo)
                 comboIndexBindable.UnbindFrom(combo.ComboIndexBindable);
-
             samplesBindable.UnbindFrom(HitObject.SamplesBindable);
 
+            // Changes in start time trigger state updates. When a new hitobject is applied, OnApply() automatically performs a state update anyway.
+            StartTimeBindable.ValueChanged -= onStartTimeChanged;
+
             // When a new hitobject is applied, the samples will be cleared before re-populating.
             // In order to stop this needless update, the event is unbound and re-bound as late as possible in Apply().
             samplesBindable.CollectionChanged -= onSamplesChanged;
@@ -305,11 +314,8 @@ namespace osu.Game.Rulesets.Objects.Drawables
         /// </summary>
         protected virtual void LoadSamples()
         {
-            if (Samples != null)
+            samplesContainer.Clear();
-            {
+            Samples = null;
-                RemoveInternal(Samples);
-                Samples = null;
-            }
 
             var samples = GetSamples().ToArray();
 
@@ -322,12 +328,13 @@ namespace osu.Game.Rulesets.Objects.Drawables
                                                     + $" This is an indication that {nameof(HitObject.ApplyDefaults)} has not been invoked on {this}.");
             }
 
-            Samples = new PausableSkinnableSound(samples.Select(s => HitObject.SampleControlPoint.ApplyTo(s)));
+            samplesContainer.Add(Samples = new PausableSkinnableSound(samples.Select(s => HitObject.SampleControlPoint.ApplyTo(s))));
-            AddInternal(Samples);
         }
 
         private void onSamplesChanged(object sender, NotifyCollectionChangedEventArgs e) => LoadSamples();
 
+        private void onStartTimeChanged(ValueChangedEvent<double> startTime) => updateState(State.Value, true);
+
         private void onNewResult(DrawableHitObject drawableHitObject, JudgementResult result) => OnNewResult?.Invoke(drawableHitObject, result);
 
         private void onRevertResult(DrawableHitObject drawableHitObject, JudgementResult result) => OnRevertResult?.Invoke(drawableHitObject, result);

osu.Game/Rulesets/UI/DrawableRuleset.cs

@@ -324,11 +324,16 @@ namespace osu.Game.Rulesets.UI
         }
 
         /// <summary>
-        /// Creates a DrawableHitObject from a HitObject.
+        /// Creates a <see cref="DrawableHitObject{TObject}"/> to represent a <see cref="HitObject"/>.
         /// </summary>
-        /// <param name="h">The HitObject to make drawable.</param>
+        /// <remarks>
-        /// <returns>The DrawableHitObject.</returns>
+        /// If this method returns <c>null</c>, then this <see cref="DrawableRuleset"/> will assume the requested <see cref="HitObject"/> type is being pooled,
-        public virtual DrawableHitObject<TObject> CreateDrawableRepresentation(TObject h) => null;
+        /// and will instead attempt to retrieve the <see cref="DrawableHitObject"/>s at the point they should become alive via pools registered through
+        /// <see cref="DrawableRuleset.RegisterPool{TObject, TDrawable}(int, int?)"/> or  <see cref="DrawableRuleset.RegisterPool{TObject, TDrawable}(DrawablePool{TDrawable})"/>.
+        /// </remarks>
+        /// <param name="h">The <see cref="HitObject"/> to represent.</param>
+        /// <returns>The representing <see cref="DrawableHitObject{TObject}"/>.</returns>
+        public abstract DrawableHitObject<TObject> CreateDrawableRepresentation(TObject h);
 
         public void Attach(KeyCounterDisplay keyCounter) =>
             (KeyBindingInputManager as ICanAttachKeyCounter)?.Attach(keyCounter);

osu.Game/Rulesets/UI/Playfield.cs

@@ -154,8 +154,6 @@ namespace osu.Game.Rulesets.UI
             return false;
         }
 
-        private readonly Dictionary<HitObject, HitObjectLifetimeEntry> lifetimeEntryMap = new Dictionary<HitObject, HitObjectLifetimeEntry>();
-
         /// <summary>
         /// Adds a <see cref="HitObjectLifetimeEntry"/> for a pooled <see cref="HitObject"/> to this <see cref="Playfield"/>.
         /// </summary>
@@ -163,7 +161,6 @@ namespace osu.Game.Rulesets.UI
         public virtual void Add(HitObjectLifetimeEntry entry)
         {
             HitObjectContainer.Add(entry);
-            lifetimeEntryMap[entry.HitObject] = entry;
             OnHitObjectAdded(entry.HitObject);
         }
 
@@ -174,9 +171,8 @@ namespace osu.Game.Rulesets.UI
         /// <returns>Whether the <see cref="HitObject"/> was successfully removed.</returns>
         public virtual bool Remove(HitObjectLifetimeEntry entry)
         {
-            if (lifetimeEntryMap.Remove(entry.HitObject))
+            if (HitObjectContainer.Remove(entry))
             {
-                HitObjectContainer.Remove(entry);
                 OnHitObjectRemoved(entry.HitObject);
                 return true;
             }

osu.Game/osu.Game.csproj

@@ -26,7 +26,7 @@
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="2.2.6" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite.Core" Version="2.2.6" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
-    <PackageReference Include="ppy.osu.Framework" Version="2020.1111.0" />
+    <PackageReference Include="ppy.osu.Framework" Version="2020.1113.0" />
     <PackageReference Include="ppy.osu.Game.Resources" Version="2020.1030.0" />
     <PackageReference Include="Sentry" Version="2.1.6" />
     <PackageReference Include="SharpCompress" Version="0.26.0" />

osu.iOS.props

@@ -70,7 +70,7 @@
     <Reference Include="System.Net.Http" />
   </ItemGroup>
   <ItemGroup Label="Package References">
-    <PackageReference Include="ppy.osu.Framework.iOS" Version="2020.1111.0" />
+    <PackageReference Include="ppy.osu.Framework.iOS" Version="2020.1113.0" />
     <PackageReference Include="ppy.osu.Game.Resources" Version="2020.1030.0" />
   </ItemGroup>
   <!-- See https://github.com/dotnet/runtime/issues/35988 (can be removed after Xamarin uses net5.0 / net6.0) -->
@@ -88,7 +88,7 @@
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="2.2.6" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite.Core" Version="2.2.6" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
-    <PackageReference Include="ppy.osu.Framework" Version="2020.1111.0" />
+    <PackageReference Include="ppy.osu.Framework" Version="2020.1113.0" />
     <PackageReference Include="SharpCompress" Version="0.26.0" />
     <PackageReference Include="NUnit" Version="3.12.0" />
     <PackageReference Include="SharpRaven" Version="2.4.0" />