Merge branch 'master' into beatmap-overlay-ruleset-selector

.github/ISSUE_TEMPLATE/mobile-issues.md

@@ -0,0 +1,8 @@
+---
+name: Mobile Report
+about: ⚠ Due to current development priorities we are not accepting mobile reports at this time (unless you're willing to fix them yourself!)
+---
+
+⚠ **PLEASE READ** ⚠: Due to prioritising finishing the client for desktop first we are not accepting reports related to mobile platforms for the time being, unless you're willing to fix them.
+If you'd like to report a problem or suggest a feature and then work on it, feel free to open an issue and highlight that you'd like to address it yourself in the issue body; mobile pull requests are also welcome.
+Otherwise, please check back in the future when the focus of development shifts towards mobile!

osu.Android.props

@@ -62,6 +62,6 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="ppy.osu.Game.Resources" Version="2019.1010.0" />
-    <PackageReference Include="ppy.osu.Framework.Android" Version="2019.1011.0" />
+    <PackageReference Include="ppy.osu.Framework.Android" Version="2019.1029.0" />
   </ItemGroup>
 </Project>

osu.Android/OsuGameActivity.cs

@@ -16,6 +16,11 @@ namespace osu.Android
 
         protected override void OnCreate(Bundle savedInstanceState)
         {
+            // The default current directory on android is '/'.
+            // On some devices '/' maps to the app data directory. On others it maps to the root of the internal storage.
+            // In order to have a consistent current directory on all devices the full path of the app data directory is set as the current directory.
+            System.Environment.CurrentDirectory = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
+
             base.OnCreate(savedInstanceState);
 
             Window.AddFlags(WindowManagerFlags.Fullscreen);

osu.Game.Rulesets.Catch.Tests/TestSceneDrawableHitObjects.cs

@@ -38,7 +38,7 @@ namespace osu.Game.Rulesets.Catch.Tests
         private void load()
         {
             var controlPointInfo = new ControlPointInfo();
-            controlPointInfo.TimingPoints.Add(new TimingControlPoint());
+            controlPointInfo.Add(0, new TimingControlPoint());
 
             WorkingBeatmap beatmap = CreateWorkingBeatmap(new Beatmap
             {

osu.Game.Rulesets.Catch/Objects/Drawable/DrawableBananaShower.cs

@@ -2,35 +2,50 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
-using System.Linq;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Drawables;
 
 namespace osu.Game.Rulesets.Catch.Objects.Drawable
 {
     public class DrawableBananaShower : DrawableCatchHitObject<BananaShower>
     {
+        private readonly Func<CatchHitObject, DrawableHitObject<CatchHitObject>> createDrawableRepresentation;
         private readonly Container bananaContainer;
 
         public DrawableBananaShower(BananaShower s, Func<CatchHitObject, DrawableHitObject<CatchHitObject>> createDrawableRepresentation = null)
             : base(s)
         {
+            this.createDrawableRepresentation = createDrawableRepresentation;
             RelativeSizeAxes = Axes.X;
             Origin = Anchor.BottomLeft;
             X = 0;
 
             AddInternal(bananaContainer = new Container { RelativeSizeAxes = Axes.Both });
-
-            foreach (var b in s.NestedHitObjects.Cast<Banana>())
-                AddNested(createDrawableRepresentation?.Invoke(b));
         }
 
-        protected override void AddNested(DrawableHitObject h)
+        protected override void AddNestedHitObject(DrawableHitObject hitObject)
         {
-            ((DrawableCatchHitObject)h).CheckPosition = o => CheckPosition?.Invoke(o) ?? false;
-            bananaContainer.Add(h);
-            base.AddNested(h);
+            base.AddNestedHitObject(hitObject);
+            bananaContainer.Add(hitObject);
+        }
+
+        protected override void ClearNestedHitObjects()
+        {
+            base.ClearNestedHitObjects();
+            bananaContainer.Clear();
+        }
+
+        protected override DrawableHitObject CreateNestedHitObject(HitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case Banana banana:
+                    return createDrawableRepresentation?.Invoke(banana)?.With(o => ((DrawableCatchHitObject)o).CheckPosition = p => CheckPosition?.Invoke(p) ?? false);
+            }
+
+            return base.CreateNestedHitObject(hitObject);
         }
     }
 }

osu.Game.Rulesets.Catch/Objects/Drawable/DrawableJuiceStream.cs

@@ -2,38 +2,50 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
-using System.Linq;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Drawables;
 
 namespace osu.Game.Rulesets.Catch.Objects.Drawable
 {
     public class DrawableJuiceStream : DrawableCatchHitObject<JuiceStream>
     {
+        private readonly Func<CatchHitObject, DrawableHitObject<CatchHitObject>> createDrawableRepresentation;
         private readonly Container dropletContainer;
 
         public DrawableJuiceStream(JuiceStream s, Func<CatchHitObject, DrawableHitObject<CatchHitObject>> createDrawableRepresentation = null)
             : base(s)
         {
+            this.createDrawableRepresentation = createDrawableRepresentation;
             RelativeSizeAxes = Axes.Both;
             Origin = Anchor.BottomLeft;
             X = 0;
 
             AddInternal(dropletContainer = new Container { RelativeSizeAxes = Axes.Both, });
-
-            foreach (var o in s.NestedHitObjects.Cast<CatchHitObject>())
-                AddNested(createDrawableRepresentation?.Invoke(o));
         }
 
-        protected override void AddNested(DrawableHitObject h)
+        protected override void AddNestedHitObject(DrawableHitObject hitObject)
         {
-            var catchObject = (DrawableCatchHitObject)h;
+            base.AddNestedHitObject(hitObject);
+            dropletContainer.Add(hitObject);
+        }
 
-            catchObject.CheckPosition = o => CheckPosition?.Invoke(o) ?? false;
+        protected override void ClearNestedHitObjects()
+        {
+            base.ClearNestedHitObjects();
+            dropletContainer.Clear();
+        }
 
-            dropletContainer.Add(h);
-            base.AddNested(h);
+        protected override DrawableHitObject CreateNestedHitObject(HitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case CatchHitObject catchObject:
+                    return createDrawableRepresentation?.Invoke(catchObject)?.With(o => ((DrawableCatchHitObject)o).CheckPosition = p => CheckPosition?.Invoke(p) ?? false);
+            }
+
+            return base.CreateNestedHitObject(hitObject);
         }
     }
 }

osu.Game.Rulesets.Mania/Edit/Blueprints/HoldNoteSelectionBlueprint.cs

@@ -16,45 +16,51 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
 {
     public class HoldNoteSelectionBlueprint : ManiaSelectionBlueprint
     {
-        public new DrawableHoldNote HitObject => (DrawableHoldNote)base.HitObject;
+        public new DrawableHoldNote DrawableObject => (DrawableHoldNote)base.DrawableObject;
 
         private readonly IBindable<ScrollingDirection> direction = new Bindable<ScrollingDirection>();
 
-        private readonly BodyPiece body;
+        [Resolved]
+        private OsuColour colours { get; set; }
 
         public HoldNoteSelectionBlueprint(DrawableHoldNote hold)
             : base(hold)
         {
-            InternalChildren = new Drawable[]
-            {
-                new HoldNoteNoteSelectionBlueprint(hold.Head),
-                new HoldNoteNoteSelectionBlueprint(hold.Tail),
-                body = new BodyPiece
-                {
-                    AccentColour = Color4.Transparent
-                },
-            };
         }
 
         [BackgroundDependencyLoader]
-        private void load(OsuColour colours, IScrollingInfo scrollingInfo)
+        private void load(IScrollingInfo scrollingInfo)
         {
-            body.BorderColour = colours.Yellow;
-
             direction.BindTo(scrollingInfo.Direction);
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            InternalChildren = new Drawable[]
+            {
+                new HoldNoteNoteSelectionBlueprint(DrawableObject.Head),
+                new HoldNoteNoteSelectionBlueprint(DrawableObject.Tail),
+                new BodyPiece
+                {
+                    AccentColour = Color4.Transparent,
+                    BorderColour = colours.Yellow
+                },
+            };
+        }
+
         protected override void Update()
         {
             base.Update();
 
-            Size = HitObject.DrawSize + new Vector2(0, HitObject.Tail.DrawHeight);
+            Size = DrawableObject.DrawSize + new Vector2(0, DrawableObject.Tail.DrawHeight);
 
             // This is a side-effect of not matching the hitobject's anchors/origins, which is kinda hard to do
             // When scrolling upwards our origin is already at the top of the head note (which is the intended location),
             // but when scrolling downwards our origin is at the _bottom_ of the tail note (where we need to be at the _top_ of the tail note)
             if (direction.Value == ScrollingDirection.Down)
-                Y -= HitObject.Tail.DrawHeight;
+                Y -= DrawableObject.Tail.DrawHeight;
         }
 
         public override Quad SelectionQuad => ScreenSpaceDrawQuad;
@@ -71,10 +77,10 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
             {
                 base.Update();
 
-                Anchor = HitObject.Anchor;
-                Origin = HitObject.Origin;
+                Anchor = DrawableObject.Anchor;
+                Origin = DrawableObject.Origin;
 
-                Position = HitObject.DrawPosition;
+                Position = DrawableObject.DrawPosition;
             }
 
             // Todo: This is temporary, since the note masks don't do anything special yet. In the future they will handle input.

osu.Game.Rulesets.Mania/Edit/Blueprints/ManiaSelectionBlueprint.cs

@@ -18,7 +18,7 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
         public Vector2 ScreenSpaceDragPosition { get; private set; }
         public Vector2 DragPosition { get; private set; }
 
-        public new DrawableManiaHitObject HitObject => (DrawableManiaHitObject)base.HitObject;
+        public new DrawableManiaHitObject DrawableObject => (DrawableManiaHitObject)base.DrawableObject;
 
         protected IClock EditorClock { get; private set; }
 
@@ -28,8 +28,8 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
         [Resolved]
         private IManiaHitObjectComposer composer { get; set; }
 
-        public ManiaSelectionBlueprint(DrawableHitObject hitObject)
-            : base(hitObject)
+        public ManiaSelectionBlueprint(DrawableHitObject drawableObject)
+            : base(drawableObject)
         {
             RelativeSizeAxes = Axes.None;
         }
@@ -44,13 +44,13 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
         {
             base.Update();
 
-            Position = Parent.ToLocalSpace(HitObject.ToScreenSpace(Vector2.Zero));
+            Position = Parent.ToLocalSpace(DrawableObject.ToScreenSpace(Vector2.Zero));
         }
 
         protected override bool OnMouseDown(MouseDownEvent e)
         {
             ScreenSpaceDragPosition = e.ScreenSpaceMousePosition;
-            DragPosition = HitObject.ToLocalSpace(e.ScreenSpaceMousePosition);
+            DragPosition = DrawableObject.ToLocalSpace(e.ScreenSpaceMousePosition);
 
             return base.OnMouseDown(e);
         }
@@ -60,20 +60,20 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
             var result = base.OnDrag(e);
 
             ScreenSpaceDragPosition = e.ScreenSpaceMousePosition;
-            DragPosition = HitObject.ToLocalSpace(e.ScreenSpaceMousePosition);
+            DragPosition = DrawableObject.ToLocalSpace(e.ScreenSpaceMousePosition);
 
             return result;
         }
 
         public override void Show()
         {
-            HitObject.AlwaysAlive = true;
+            DrawableObject.AlwaysAlive = true;
             base.Show();
         }
 
         public override void Hide()
         {
-            HitObject.AlwaysAlive = false;
+            DrawableObject.AlwaysAlive = false;
             base.Hide();
         }
     }

osu.Game.Rulesets.Mania/Edit/Blueprints/NoteSelectionBlueprint.cs

@@ -19,7 +19,7 @@ namespace osu.Game.Rulesets.Mania.Edit.Blueprints
         {
             base.Update();
 
-            Size = HitObject.DrawSize;
+            Size = DrawableObject.DrawSize;
         }
     }
 }

osu.Game.Rulesets.Mania/Edit/ManiaSelectionHandler.cs

@@ -32,7 +32,7 @@ namespace osu.Game.Rulesets.Mania.Edit
         public override void HandleMovement(MoveSelectionEvent moveEvent)
         {
             var maniaBlueprint = (ManiaSelectionBlueprint)moveEvent.Blueprint;
-            int lastColumn = maniaBlueprint.HitObject.HitObject.Column;
+            int lastColumn = maniaBlueprint.DrawableObject.HitObject.Column;
 
             adjustOrigins(maniaBlueprint);
             performDragMovement(moveEvent);
@@ -48,19 +48,19 @@ namespace osu.Game.Rulesets.Mania.Edit
         /// <param name="reference">The <see cref="ManiaSelectionBlueprint"/> that received the drag event.</param>
         private void adjustOrigins(ManiaSelectionBlueprint reference)
         {
-            var referenceParent = (HitObjectContainer)reference.HitObject.Parent;
+            var referenceParent = (HitObjectContainer)reference.DrawableObject.Parent;
 
-            float offsetFromReferenceOrigin = reference.DragPosition.Y - reference.HitObject.OriginPosition.Y;
+            float offsetFromReferenceOrigin = reference.DragPosition.Y - reference.DrawableObject.OriginPosition.Y;
             float targetPosition = referenceParent.ToLocalSpace(reference.ScreenSpaceDragPosition).Y - offsetFromReferenceOrigin;
 
             // Flip the vertical coordinate space when scrolling downwards
             if (scrollingInfo.Direction.Value == ScrollingDirection.Down)
                 targetPosition = targetPosition - referenceParent.DrawHeight;
 
-            float movementDelta = targetPosition - reference.HitObject.Position.Y;
+            float movementDelta = targetPosition - reference.DrawableObject.Position.Y;
 
             foreach (var b in SelectedBlueprints.OfType<ManiaSelectionBlueprint>())
-                b.HitObject.Y += movementDelta;
+                b.DrawableObject.Y += movementDelta;
         }
 
         private void performDragMovement(MoveSelectionEvent moveEvent)
@@ -70,11 +70,11 @@ namespace osu.Game.Rulesets.Mania.Edit
             // When scrolling downwards the anchor position is at the bottom of the screen, however the movement event assumes the anchor is at the top of the screen.
             // This causes the delta to assume a positive hitobject position, and which can be corrected for by subtracting the parent height.
             if (scrollingInfo.Direction.Value == ScrollingDirection.Down)
-                delta -= moveEvent.Blueprint.HitObject.Parent.DrawHeight;
+                delta -= moveEvent.Blueprint.DrawableObject.Parent.DrawHeight;
 
             foreach (var b in SelectedBlueprints)
             {
-                var hitObject = b.HitObject;
+                var hitObject = b.DrawableObject;
                 var objectParent = (HitObjectContainer)hitObject.Parent;
 
                 // StartTime could be used to adjust the position if only one movement event was received per frame.

osu.Game.Rulesets.Mania/Edit/Masks/ManiaSelectionBlueprint.cs

@@ -9,8 +9,8 @@ namespace osu.Game.Rulesets.Mania.Edit.Masks
 {
     public abstract class ManiaSelectionBlueprint : SelectionBlueprint
     {
-        protected ManiaSelectionBlueprint(DrawableHitObject hitObject)
-            : base(hitObject)
+        protected ManiaSelectionBlueprint(DrawableHitObject drawableObject)
+            : base(drawableObject)
         {
             RelativeSizeAxes = Axes.None;
         }

osu.Game.Rulesets.Mania/Objects/Drawables/DrawableHoldNote.cs

@@ -2,13 +2,12 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Diagnostics;
-using System.Linq;
 using osu.Framework.Bindables;
-using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Framework.Graphics;
 using osu.Game.Rulesets.Mania.Objects.Drawables.Pieces;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Input.Bindings;
+using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Scoring;
 using osu.Game.Rulesets.UI.Scrolling;
@@ -22,8 +21,12 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
     {
         public override bool DisplayResult => false;
 
-        public readonly DrawableNote Head;
-        public readonly DrawableNote Tail;
+        public DrawableNote Head => headContainer.Child;
+        public DrawableNote Tail => tailContainer.Child;
+
+        private readonly Container<DrawableHeadNote> headContainer;
+        private readonly Container<DrawableTailNote> tailContainer;
+        private readonly Container<DrawableHoldNoteTick> tickContainer;
 
         private readonly BodyPiece bodyPiece;
 
@@ -40,50 +43,81 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
         public DrawableHoldNote(HoldNote hitObject)
             : base(hitObject)
         {
-            Container<DrawableHoldNoteTick> tickContainer;
             RelativeSizeAxes = Axes.X;
 
             AddRangeInternal(new Drawable[]
             {
-                bodyPiece = new BodyPiece
-                {
-                    RelativeSizeAxes = Axes.X,
-                },
-                tickContainer = new Container<DrawableHoldNoteTick>
-                {
-                    RelativeSizeAxes = Axes.Both,
-                    ChildrenEnumerable = HitObject.NestedHitObjects.OfType<HoldNoteTick>().Select(tick => new DrawableHoldNoteTick(tick)
-                    {
-                        HoldStartTime = () => holdStartTime
-                    })
-                },
-                Head = new DrawableHeadNote(this)
-                {
-                    Anchor = Anchor.TopCentre,
-                    Origin = Anchor.TopCentre
-                },
-                Tail = new DrawableTailNote(this)
-                {
-                    Anchor = Anchor.TopCentre,
-                    Origin = Anchor.TopCentre
-                }
+                bodyPiece = new BodyPiece { RelativeSizeAxes = Axes.X },
+                tickContainer = new Container<DrawableHoldNoteTick> { RelativeSizeAxes = Axes.Both },
+                headContainer = new Container<DrawableHeadNote> { RelativeSizeAxes = Axes.Both },
+                tailContainer = new Container<DrawableTailNote> { RelativeSizeAxes = Axes.Both },
             });
 
-            foreach (var tick in tickContainer)
-                AddNested(tick);
-
-            AddNested(Head);
-            AddNested(Tail);
-
             AccentColour.BindValueChanged(colour =>
             {
                 bodyPiece.AccentColour = colour.NewValue;
-                Head.AccentColour.Value = colour.NewValue;
-                Tail.AccentColour.Value = colour.NewValue;
-                tickContainer.ForEach(t => t.AccentColour.Value = colour.NewValue);
             }, true);
         }
 
+        protected override void AddNestedHitObject(DrawableHitObject hitObject)
+        {
+            base.AddNestedHitObject(hitObject);
+
+            switch (hitObject)
+            {
+                case DrawableHeadNote head:
+                    headContainer.Child = head;
+                    break;
+
+                case DrawableTailNote tail:
+                    tailContainer.Child = tail;
+                    break;
+
+                case DrawableHoldNoteTick tick:
+                    tickContainer.Add(tick);
+                    break;
+            }
+        }
+
+        protected override void ClearNestedHitObjects()
+        {
+            base.ClearNestedHitObjects();
+            headContainer.Clear();
+            tailContainer.Clear();
+            tickContainer.Clear();
+        }
+
+        protected override DrawableHitObject CreateNestedHitObject(HitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case TailNote _:
+                    return new DrawableTailNote(this)
+                    {
+                        Anchor = Anchor.TopCentre,
+                        Origin = Anchor.TopCentre,
+                        AccentColour = { BindTarget = AccentColour }
+                    };
+
+                case Note _:
+                    return new DrawableHeadNote(this)
+                    {
+                        Anchor = Anchor.TopCentre,
+                        Origin = Anchor.TopCentre,
+                        AccentColour = { BindTarget = AccentColour }
+                    };
+
+                case HoldNoteTick tick:
+                    return new DrawableHoldNoteTick(tick)
+                    {
+                        HoldStartTime = () => holdStartTime,
+                        AccentColour = { BindTarget = AccentColour }
+                    };
+            }
+
+            return base.CreateNestedHitObject(hitObject);
+        }
+
         protected override void OnDirectionChanged(ValueChangedEvent<ScrollingDirection> e)
         {
             base.OnDirectionChanged(e);

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

@@ -52,12 +52,19 @@ namespace osu.Game.Rulesets.Osu.Tests
             AddAssert("blueprint positioned over hitobject", () => blueprint.CirclePiece.Position == hitCircle.Position);
         }
 
+        [Test]
+        public void TestStackedHitObject()
+        {
+            AddStep("set stacking", () => hitCircle.StackHeight = 5);
+            AddAssert("blueprint positioned over hitobject", () => blueprint.CirclePiece.Position == hitCircle.StackedPosition);
+        }
+
         private class TestBlueprint : HitCircleSelectionBlueprint
         {
             public new HitCirclePiece CirclePiece => base.CirclePiece;
 
-            public TestBlueprint(DrawableHitCircle hitCircle)
-                : base(hitCircle)
+            public TestBlueprint(DrawableHitCircle drawableCircle)
+                : base(drawableCircle)
             {
             }
         }

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

@@ -2,6 +2,7 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
+using System.Collections.Generic;
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
@@ -10,10 +11,12 @@ using osu.Framework.Graphics.Shapes;
 using osu.Framework.Input.Events;
 using osu.Framework.MathUtils;
 using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Osu.Beatmaps;
 using osu.Game.Rulesets.Osu.Edit;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Screens.Edit;
+using osu.Game.Screens.Edit.Compose.Components;
 using osu.Game.Tests.Visual;
 using osuTK;
 using osuTK.Graphics;
@@ -25,32 +28,44 @@ namespace osu.Game.Rulesets.Osu.Tests
         private const double beat_length = 100;
         private static readonly Vector2 grid_position = new Vector2(512, 384);
 
+        public override IReadOnlyList<Type> RequiredTypes => new[]
+        {
+            typeof(CircularDistanceSnapGrid)
+        };
+
         [Cached(typeof(IEditorBeatmap))]
         private readonly EditorBeatmap<OsuHitObject> editorBeatmap;
 
         [Cached]
         private readonly BindableBeatDivisor beatDivisor = new BindableBeatDivisor();
 
-        private TestOsuDistanceSnapGrid grid;
+        [Cached(typeof(IDistanceSnapProvider))]
+        private readonly SnapProvider snapProvider = new SnapProvider();
+
+        private readonly TestOsuDistanceSnapGrid grid;
 
         public TestSceneOsuDistanceSnapGrid()
         {
             editorBeatmap = new EditorBeatmap<OsuHitObject>(new OsuBeatmap());
 
-            createGrid();
+            Children = new Drawable[]
+            {
+                new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Colour = Color4.SlateGray
+                },
+                grid = new TestOsuDistanceSnapGrid(new HitCircle { Position = grid_position }),
+                new SnappingCursorContainer { GetSnapPosition = v => grid.GetSnappedPosition(grid.ToLocalSpace(v)).position }
+            };
         }
 
         [SetUp]
         public void Setup() => Schedule(() =>
         {
-            Clear();
-
             editorBeatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = 1;
-            editorBeatmap.ControlPointInfo.DifficultyPoints.Clear();
-            editorBeatmap.ControlPointInfo.TimingPoints.Clear();
-            editorBeatmap.ControlPointInfo.TimingPoints.Add(new TimingControlPoint { BeatLength = beat_length });
-
-            beatDivisor.Value = 1;
+            editorBeatmap.ControlPointInfo.Clear();
+            editorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = beat_length });
         });
 
         [TestCase(1)]
@@ -64,53 +79,11 @@ namespace osu.Game.Rulesets.Osu.Tests
         public void TestBeatDivisor(int divisor)
         {
             AddStep($"set beat divisor = {divisor}", () => beatDivisor.Value = divisor);
-            createGrid();
-        }
-
-        [TestCase(100, 100)]
-        [TestCase(200, 100)]
-        public void TestBeatLength(float beatLength, float expectedSpacing)
-        {
-            AddStep($"set beat length = {beatLength}", () =>
-            {
-                editorBeatmap.ControlPointInfo.TimingPoints.Clear();
-                editorBeatmap.ControlPointInfo.TimingPoints.Add(new TimingControlPoint { BeatLength = beatLength });
-            });
-
-            createGrid();
-            AddAssert($"spacing = {expectedSpacing}", () => Precision.AlmostEquals(expectedSpacing, grid.DistanceSpacing));
-        }
-
-        [TestCase(0.5f, 50)]
-        [TestCase(1, 100)]
-        [TestCase(1.5f, 150)]
-        public void TestSpeedMultiplier(float multiplier, float expectedSpacing)
-        {
-            AddStep($"set speed multiplier = {multiplier}", () =>
-            {
-                editorBeatmap.ControlPointInfo.DifficultyPoints.Clear();
-                editorBeatmap.ControlPointInfo.DifficultyPoints.Add(new DifficultyControlPoint { SpeedMultiplier = multiplier });
-            });
-
-            createGrid();
-            AddAssert($"spacing = {expectedSpacing}", () => Precision.AlmostEquals(expectedSpacing, grid.DistanceSpacing));
-        }
-
-        [TestCase(0.5f, 50)]
-        [TestCase(1, 100)]
-        [TestCase(1.5f, 150)]
-        public void TestSliderMultiplier(float multiplier, float expectedSpacing)
-        {
-            AddStep($"set speed multiplier = {multiplier}", () => editorBeatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = multiplier);
-            createGrid();
-            AddAssert($"spacing = {expectedSpacing}", () => Precision.AlmostEquals(expectedSpacing, grid.DistanceSpacing));
         }
 
         [Test]
         public void TestCursorInCentre()
         {
-            createGrid();
-
             AddStep("move mouse to centre", () => InputManager.MoveMouseTo(grid.ToScreenSpace(grid_position)));
             assertSnappedDistance((float)beat_length);
         }
@@ -118,8 +91,6 @@ namespace osu.Game.Rulesets.Osu.Tests
         [Test]
         public void TestCursorBeforeMovementPoint()
         {
-            createGrid();
-
             AddStep("move mouse to just before movement point", () => InputManager.MoveMouseTo(grid.ToScreenSpace(grid_position + new Vector2((float)beat_length, 0) * 1.49f)));
             assertSnappedDistance((float)beat_length);
         }
@@ -127,37 +98,17 @@ namespace osu.Game.Rulesets.Osu.Tests
         [Test]
         public void TestCursorAfterMovementPoint()
         {
-            createGrid();
-
             AddStep("move mouse to just after movement point", () => InputManager.MoveMouseTo(grid.ToScreenSpace(grid_position + new Vector2((float)beat_length, 0) * 1.51f)));
             assertSnappedDistance((float)beat_length * 2);
         }
 
         private void assertSnappedDistance(float expectedDistance) => AddAssert($"snap distance = {expectedDistance}", () =>
         {
-            Vector2 snappedPosition = grid.GetSnapPosition(grid.ToLocalSpace(InputManager.CurrentState.Mouse.Position));
-            float distance = Vector2.Distance(snappedPosition, grid_position);
+            Vector2 snappedPosition = grid.GetSnappedPosition(grid.ToLocalSpace(InputManager.CurrentState.Mouse.Position)).position;
 
-            return Precision.AlmostEquals(expectedDistance, distance);
+            return Precision.AlmostEquals(expectedDistance, Vector2.Distance(snappedPosition, grid_position));
         });
 
-        private void createGrid()
-        {
-            AddStep("create grid", () =>
-            {
-                Children = new Drawable[]
-                {
-                    new Box
-                    {
-                        RelativeSizeAxes = Axes.Both,
-                        Colour = Color4.SlateGray
-                    },
-                    grid = new TestOsuDistanceSnapGrid(new HitCircle { Position = grid_position }),
-                    new SnappingCursorContainer { GetSnapPosition = v => grid.GetSnapPosition(grid.ToLocalSpace(v)) }
-                };
-            });
-        }
-
         private class SnappingCursorContainer : CompositeDrawable
         {
             public Func<Vector2, Vector2> GetSnapPosition;
@@ -206,5 +157,20 @@ namespace osu.Game.Rulesets.Osu.Tests
             {
             }
         }
+
+        private class SnapProvider : IDistanceSnapProvider
+        {
+            public (Vector2 position, double time) GetSnappedPosition(Vector2 position, double time) => (position, time);
+
+            public float GetBeatSnapDistanceAt(double referenceTime) => (float)beat_length;
+
+            public float DurationToDistance(double referenceTime, double duration) => 0;
+
+            public double DistanceToDuration(double referenceTime, float distance) => 0;
+
+            public double GetSnappedDurationFromDistance(double referenceTime, float distance) => 0;
+
+            public float GetSnappedDistanceFromDistance(double referenceTime, float distance) => 0;
+        }
     }
 }

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

@@ -111,6 +111,21 @@ namespace osu.Game.Rulesets.Osu.Tests
             AddStep("Distance Overflow 1 Repeat", () => SetContents(() => testDistanceOverflow(1)));
         }
 
+        [Test]
+        public void TestChangeStackHeight()
+        {
+            DrawableSlider slider = null;
+
+            AddStep("create slider", () =>
+            {
+                slider = (DrawableSlider)createSlider(repeats: 1);
+                Add(slider);
+            });
+
+            AddStep("change stack height", () => slider.HitObject.StackHeight = 10);
+            AddAssert("body positioned correctly", () => slider.Position == slider.HitObject.StackedPosition);
+        }
+
         private Drawable testSimpleBig(int repeats = 0) => createSlider(2, repeats: repeats);
 
         private Drawable testSimpleBigLargeStackOffset(int repeats = 0) => createSlider(2, repeats: repeats, stackHeight: 10);
@@ -293,7 +308,7 @@ namespace osu.Game.Rulesets.Osu.Tests
         private Drawable createDrawable(Slider slider, float circleSize, double speedMultiplier)
         {
             var cpi = new ControlPointInfo();
-            cpi.DifficultyPoints.Add(new DifficultyControlPoint { SpeedMultiplier = speedMultiplier });
+            cpi.Add(0, new DifficultyControlPoint { SpeedMultiplier = speedMultiplier });
 
             slider.ApplyDefaults(cpi, new BeatmapDifficulty { CircleSize = circleSize, SliderTickRate = 3 });
 

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

@@ -313,10 +313,6 @@ namespace osu.Game.Rulesets.Osu.Tests
                             }, 25),
                         }
                     },
-                    ControlPointInfo =
-                    {
-                        DifficultyPoints = { new DifficultyControlPoint { SpeedMultiplier = 0.1f } }
-                    },
                     BeatmapInfo =
                     {
                         BaseDifficulty = new BeatmapDifficulty { SliderTickRate = 3 },
@@ -324,6 +320,8 @@ namespace osu.Game.Rulesets.Osu.Tests
                     },
                 });
 
+                Beatmap.Value.Beatmap.ControlPointInfo.Add(0, new DifficultyControlPoint { SpeedMultiplier = 0.1f });
+
                 var p = new ScoreAccessibleReplayPlayer(new Score { Replay = new Replay { Frames = frames } });
 
                 p.OnLoadComplete += _ =>

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

@@ -78,6 +78,13 @@ namespace osu.Game.Rulesets.Osu.Tests
             checkPositions();
         }
 
+        [Test]
+        public void TestStackedHitObject()
+        {
+            AddStep("set stacking", () => slider.StackHeight = 5);
+            checkPositions();
+        }
+
         private void moveHitObject()
         {
             AddStep("move hitobject", () =>
@@ -88,7 +95,7 @@ namespace osu.Game.Rulesets.Osu.Tests
 
         private void checkPositions()
         {
-            AddAssert("body positioned correctly", () => blueprint.BodyPiece.Position == slider.Position);
+            AddAssert("body positioned correctly", () => blueprint.BodyPiece.Position == slider.StackedPosition);
 
             AddAssert("head positioned correctly",
                 () => Precision.AlmostEquals(blueprint.HeadBlueprint.CirclePiece.ScreenSpaceDrawQuad.Centre, drawableObject.HeadCircle.ScreenSpaceDrawQuad.Centre));

osu.Game.Rulesets.Osu/Edit/Blueprints/BlueprintPiece.cs

@@ -19,7 +19,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints
         /// <param name="hitObject">The <see cref="OsuHitObject"/> to reference properties from.</param>
         public virtual void UpdateFrom(T hitObject)
         {
-            Position = hitObject.Position;
+            Position = hitObject.StackedPosition;
         }
     }
 }

osu.Game.Rulesets.Osu/Edit/Blueprints/HitCircles/HitCircleSelectionBlueprint.cs

@@ -1,18 +1,22 @@
 // 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.Graphics.Primitives;
 using osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles.Components;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.Osu.Objects.Drawables;
+using osuTK;
 
 namespace osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles
 {
     public class HitCircleSelectionBlueprint : OsuSelectionBlueprint<HitCircle>
     {
+        protected new DrawableHitCircle DrawableObject => (DrawableHitCircle)base.DrawableObject;
+
         protected readonly HitCirclePiece CirclePiece;
 
-        public HitCircleSelectionBlueprint(DrawableHitCircle hitCircle)
-            : base(hitCircle)
+        public HitCircleSelectionBlueprint(DrawableHitCircle drawableCircle)
+            : base(drawableCircle)
         {
             InternalChild = CirclePiece = new HitCirclePiece();
         }
@@ -23,5 +27,9 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles
 
             CirclePiece.UpdateFrom(HitObject);
         }
+
+        public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => DrawableObject.HitArea.ReceivePositionalInputAt(screenSpacePos);
+
+        public override Quad SelectionQuad => DrawableObject.HitArea.ScreenSpaceDrawQuad;
     }
 }

osu.Game.Rulesets.Osu/Edit/Blueprints/OsuSelectionBlueprint.cs

@@ -10,10 +10,10 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints
     public abstract class OsuSelectionBlueprint<T> : SelectionBlueprint
         where T : OsuHitObject
     {
-        protected new T HitObject => (T)base.HitObject.HitObject;
+        protected T HitObject => (T)DrawableObject.HitObject;
 
-        protected OsuSelectionBlueprint(DrawableHitObject hitObject)
-            : base(hitObject)
+        protected OsuSelectionBlueprint(DrawableHitObject drawableObject)
+            : base(drawableObject)
         {
         }
     }

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/Components/PathControlPointPiece.cs

@@ -1,6 +1,7 @@
 // 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 osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
@@ -8,7 +9,6 @@ using osu.Framework.Graphics.Lines;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Input.Events;
 using osu.Game.Graphics;
-using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Osu.Objects;
 using osuTK;
 
@@ -16,6 +16,8 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
 {
     public class PathControlPointPiece : BlueprintPiece<Slider>
     {
+        public Action<Vector2[]> ControlPointsChanged;
+
         private readonly Slider slider;
         private readonly int index;
 
@@ -96,7 +98,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             if (isSegmentSeparatorWithPrevious)
                 newControlPoints[index - 1] = newControlPoints[index];
 
-            slider.Path = new SliderPath(slider.Path.Type, newControlPoints);
+            ControlPointsChanged?.Invoke(newControlPoints);
 
             return true;
         }

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/Components/PathControlPointVisualiser.cs

@@ -1,14 +1,18 @@
 // 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 osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Game.Rulesets.Osu.Objects;
+using osuTK;
 
 namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
 {
     public class PathControlPointVisualiser : CompositeDrawable
     {
+        public Action<Vector2[]> ControlPointsChanged;
+
         private readonly Slider slider;
 
         private readonly Container<PathControlPointPiece> pieces;
@@ -25,7 +29,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             base.Update();
 
             while (slider.Path.ControlPoints.Length > pieces.Count)
-                pieces.Add(new PathControlPointPiece(slider, pieces.Count));
+                pieces.Add(new PathControlPointPiece(slider, pieces.Count) { ControlPointsChanged = c => ControlPointsChanged?.Invoke(c) });
             while (slider.Path.ControlPoints.Length < pieces.Count)
                 pieces.Remove(pieces[pieces.Count - 1]);
         }

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/SliderPlacementBlueprint.cs

@@ -6,6 +6,7 @@ using System.Linq;
 using osu.Framework.Allocation;
 using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Framework.Graphics;
+using osu.Framework.Input;
 using osu.Framework.Input.Events;
 using osu.Game.Graphics;
 using osu.Game.Rulesets.Edit;
@@ -28,9 +29,13 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
 
         private readonly List<Segment> segments = new List<Segment>();
         private Vector2 cursor;
+        private InputManager inputManager;
 
         private PlacementState state;
 
+        [Resolved(CanBeNull = true)]
+        private HitObjectComposer composer { get; set; }
+
         public SliderPlacementBlueprint()
             : base(new Objects.Slider())
         {
@@ -46,12 +51,18 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
                 bodyPiece = new SliderBodyPiece(),
                 headCirclePiece = new HitCirclePiece(),
                 tailCirclePiece = new HitCirclePiece(),
-                new PathControlPointVisualiser(HitObject),
+                new PathControlPointVisualiser(HitObject) { ControlPointsChanged = _ => updateSlider() },
             };
 
             setState(PlacementState.Initial);
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            inputManager = GetContainingInputManager();
+        }
+
         public override void UpdatePosition(Vector2 screenSpacePosition)
         {
             switch (state)
@@ -61,7 +72,9 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
                     break;
 
                 case PlacementState.Body:
-                    cursor = ToLocalSpace(screenSpacePosition) - HitObject.Position;
+                    // The given screen-space position may have been externally snapped, but the unsnapped position from the input manager
+                    // is used instead since snapping control points doesn't make much sense
+                    cursor = ToLocalSpace(inputManager.CurrentState.Mouse.Position) - HitObject.Position;
                     break;
             }
         }
@@ -121,8 +134,12 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
 
         private void updateSlider()
         {
-            var newControlPoints = segments.SelectMany(s => s.ControlPoints).Concat(cursor.Yield()).ToArray();
-            HitObject.Path = new SliderPath(newControlPoints.Length > 2 ? PathType.Bezier : PathType.Linear, newControlPoints);
+            Vector2[] newControlPoints = segments.SelectMany(s => s.ControlPoints).Concat(cursor.Yield()).ToArray();
+
+            var unsnappedPath = new SliderPath(newControlPoints.Length > 2 ? PathType.Bezier : PathType.Linear, newControlPoints);
+            var snappedDistance = composer?.GetSnappedDistanceFromDistance(HitObject.StartTime, (float)unsnappedPath.Distance) ?? (float)unsnappedPath.Distance;
+
+            HitObject.Path = new SliderPath(unsnappedPath.Type, newControlPoints, snappedDistance);
 
             bodyPiece.UpdateFrom(HitObject);
             headCirclePiece.UpdateFrom(HitObject.HeadCircle);

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/SliderSelectionBlueprint.cs

@@ -1,7 +1,11 @@
 // 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.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
 using osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.Osu.Objects.Drawables;
@@ -15,6 +19,9 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
         protected readonly SliderCircleSelectionBlueprint HeadBlueprint;
         protected readonly SliderCircleSelectionBlueprint TailBlueprint;
 
+        [Resolved(CanBeNull = true)]
+        private HitObjectComposer composer { get; set; }
+
         public SliderSelectionBlueprint(DrawableSlider slider)
             : base(slider)
         {
@@ -25,7 +32,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
                 BodyPiece = new SliderBodyPiece(),
                 HeadBlueprint = CreateCircleSelectionBlueprint(slider, SliderPosition.Start),
                 TailBlueprint = CreateCircleSelectionBlueprint(slider, SliderPosition.End),
-                new PathControlPointVisualiser(sliderObject),
+                new PathControlPointVisualiser(sliderObject) { ControlPointsChanged = onNewControlPoints },
             };
         }
 
@@ -36,8 +43,18 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
             BodyPiece.UpdateFrom(HitObject);
         }
 
+        private void onNewControlPoints(Vector2[] controlPoints)
+        {
+            var unsnappedPath = new SliderPath(controlPoints.Length > 2 ? PathType.Bezier : PathType.Linear, controlPoints);
+            var snappedDistance = composer?.GetSnappedDistanceFromDistance(HitObject.StartTime, (float)unsnappedPath.Distance) ?? (float)unsnappedPath.Distance;
+
+            HitObject.Path = new SliderPath(unsnappedPath.Type, controlPoints, snappedDistance);
+        }
+
         public override Vector2 SelectionPoint => HeadBlueprint.SelectionPoint;
 
+        public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => BodyPiece.ReceivePositionalInputAt(screenSpacePos);
+
         protected virtual SliderCircleSelectionBlueprint CreateCircleSelectionBlueprint(DrawableSlider slider, SliderPosition position) => new SliderCircleSelectionBlueprint(slider, position);
     }
 }

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

@@ -1,8 +1,6 @@
 // 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.Game.Beatmaps;
-using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Screens.Edit.Compose.Components;
 
@@ -13,16 +11,7 @@ namespace osu.Game.Rulesets.Osu.Edit
         public OsuDistanceSnapGrid(OsuHitObject hitObject)
             : base(hitObject, hitObject.StackedEndPosition)
         {
-        }
-
-        protected override float GetVelocity(double time, ControlPointInfo controlPointInfo, BeatmapDifficulty difficulty)
-        {
-            TimingControlPoint timingPoint = controlPointInfo.TimingPointAt(time);
-            DifficultyControlPoint difficultyPoint = controlPointInfo.DifficultyPointAt(time);
-
-            double scoringDistance = OsuHitObject.BASE_SCORING_DISTANCE * difficulty.SliderMultiplier * difficultyPoint.SpeedMultiplier;
-
-            return (float)(scoringDistance / timingPoint.BeatLength);
+            Masking = true;
         }
     }
 }

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

@@ -2,10 +2,12 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System.Collections.Generic;
+using System.Linq;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Edit.Tools;
 using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles;
 using osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders;
@@ -52,5 +54,31 @@ namespace osu.Game.Rulesets.Osu.Edit
 
             return base.CreateBlueprintFor(hitObject);
         }
+
+        protected override DistanceSnapGrid CreateDistanceSnapGrid(IEnumerable<HitObject> selectedHitObjects)
+        {
+            var objects = selectedHitObjects.ToList();
+
+            if (objects.Count == 0)
+            {
+                var lastObject = EditorBeatmap.HitObjects.LastOrDefault(h => h.StartTime <= EditorClock.CurrentTime);
+
+                if (lastObject == null)
+                    return null;
+
+                return new OsuDistanceSnapGrid(lastObject);
+            }
+            else
+            {
+                double minTime = objects.Min(h => h.StartTime);
+
+                var lastObject = EditorBeatmap.HitObjects.LastOrDefault(h => h.StartTime < minTime);
+
+                if (lastObject == null)
+                    return null;
+
+                return new OsuDistanceSnapGrid(lastObject);
+            }
+        }
     }
 }

osu.Game.Rulesets.Osu/Objects/Drawables/DrawableHitCircle.cs

@@ -24,14 +24,12 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
         private readonly IBindable<int> stackHeightBindable = new Bindable<int>();
         private readonly IBindable<float> scaleBindable = new Bindable<float>();
 
-        public OsuAction? HitAction => hitArea.HitAction;
+        public OsuAction? HitAction => HitArea.HitAction;
 
+        public readonly HitReceptor HitArea;
+        public readonly SkinnableDrawable CirclePiece;
         private readonly Container scaleContainer;
 
-        private readonly HitArea hitArea;
-
-        public SkinnableDrawable CirclePiece { get; }
-
         public DrawableHitCircle(HitCircle h)
             : base(h)
         {
@@ -48,7 +46,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
                     Anchor = Anchor.Centre,
                     Children = new Drawable[]
                     {
-                        hitArea = new HitArea
+                        HitArea = new HitReceptor
                         {
                             Hit = () =>
                             {
@@ -69,7 +67,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
                 },
             };
 
-            Size = hitArea.DrawSize;
+            Size = HitArea.DrawSize;
         }
 
         [BackgroundDependencyLoader]
@@ -153,7 +151,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
 
                     Expire(true);
 
-                    hitArea.HitAction = null;
+                    HitArea.HitAction = null;
                     break;
 
                 case ArmedState.Miss:
@@ -172,7 +170,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
 
         public Drawable ProxiedLayer => ApproachCircle;
 
-        private class HitArea : Drawable, IKeyBindingHandler<OsuAction>
+        public class HitReceptor : Drawable, IKeyBindingHandler<OsuAction>
         {
             // IsHovered is used
             public override bool HandlePositionalInput => true;
@@ -181,7 +179,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
 
             public OsuAction? HitAction;
 
-            public HitArea()
+            public HitReceptor()
             {
                 Size = new Vector2(OsuHitObject.OBJECT_RADIUS * 2);
 

osu.Game.Rulesets.Osu/Objects/Drawables/DrawableSlider.cs

@@ -5,7 +5,6 @@ using osuTK;
 using osu.Framework.Graphics;
 using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Objects.Drawables.Pieces;
-using System.Collections.Generic;
 using System.Linq;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
@@ -21,16 +20,21 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
 {
     public class DrawableSlider : DrawableOsuHitObject, IDrawableHitObjectWithProxiedApproach
     {
-        private readonly Slider slider;
-        private readonly List<Drawable> components = new List<Drawable>();
-
-        public readonly DrawableHitCircle HeadCircle;
-        public readonly DrawableSliderTail TailCircle;
+        public DrawableSliderHead HeadCircle => headContainer.Child;
+        public DrawableSliderTail TailCircle => tailContainer.Child;
 
         public readonly SnakingSliderBody Body;
         public readonly SliderBall Ball;
 
+        private readonly Container<DrawableSliderHead> headContainer;
+        private readonly Container<DrawableSliderTail> tailContainer;
+        private readonly Container<DrawableSliderTick> tickContainer;
+        private readonly Container<DrawableRepeatPoint> repeatContainer;
+
+        private readonly Slider slider;
+
         private readonly IBindable<Vector2> positionBindable = new Bindable<Vector2>();
+        private readonly IBindable<int> stackHeightBindable = new Bindable<int>();
         private readonly IBindable<float> scaleBindable = new Bindable<float>();
         private readonly IBindable<SliderPath> pathBindable = new Bindable<SliderPath>();
 
@@ -44,14 +48,11 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
 
             Position = s.StackedPosition;
 
-            Container<DrawableSliderTick> ticks;
-            Container<DrawableRepeatPoint> repeatPoints;
-
             InternalChildren = new Drawable[]
             {
                 Body = new SnakingSliderBody(s),
-                ticks = new Container<DrawableSliderTick> { RelativeSizeAxes = Axes.Both },
-                repeatPoints = new Container<DrawableRepeatPoint> { RelativeSizeAxes = Axes.Both },
+                tickContainer = new Container<DrawableSliderTick> { RelativeSizeAxes = Axes.Both },
+                repeatContainer = new Container<DrawableRepeatPoint> { RelativeSizeAxes = Axes.Both },
                 Ball = new SliderBall(s, this)
                 {
                     GetInitialHitAction = () => HeadCircle.HitAction,
@@ -60,45 +61,9 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
                     AlwaysPresent = true,
                     Alpha = 0
                 },
-                HeadCircle = new DrawableSliderHead(s, s.HeadCircle)
-                {
-                    OnShake = Shake
-                },
-                TailCircle = new DrawableSliderTail(s, s.TailCircle)
+                headContainer = new Container<DrawableSliderHead> { RelativeSizeAxes = Axes.Both },
+                tailContainer = new Container<DrawableSliderTail> { RelativeSizeAxes = Axes.Both },
             };
-
-            components.Add(Body);
-            components.Add(Ball);
-
-            AddNested(HeadCircle);
-
-            AddNested(TailCircle);
-            components.Add(TailCircle);
-
-            foreach (var tick in s.NestedHitObjects.OfType<SliderTick>())
-            {
-                var drawableTick = new DrawableSliderTick(tick) { Position = tick.Position - s.Position };
-
-                ticks.Add(drawableTick);
-                components.Add(drawableTick);
-                AddNested(drawableTick);
-            }
-
-            foreach (var repeatPoint in s.NestedHitObjects.OfType<RepeatPoint>())
-            {
-                var drawableRepeatPoint = new DrawableRepeatPoint(repeatPoint, this) { Position = repeatPoint.Position - s.Position };
-
-                repeatPoints.Add(drawableRepeatPoint);
-                components.Add(drawableRepeatPoint);
-                AddNested(drawableRepeatPoint);
-            }
-        }
-
-        protected override void UpdateInitialTransforms()
-        {
-            base.UpdateInitialTransforms();
-
-            Body.FadeInFromZero(HitObject.TimeFadeIn);
         }
 
         [BackgroundDependencyLoader]
@@ -108,6 +73,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
             config?.BindWith(OsuRulesetSetting.SnakingOutSliders, Body.SnakingOut);
 
             positionBindable.BindValueChanged(_ => Position = HitObject.StackedPosition);
+            stackHeightBindable.BindValueChanged(_ => Position = HitObject.StackedPosition);
             scaleBindable.BindValueChanged(scale =>
             {
                 updatePathRadius();
@@ -115,6 +81,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
             });
 
             positionBindable.BindTo(HitObject.PositionBindable);
+            stackHeightBindable.BindTo(HitObject.StackHeightBindable);
             scaleBindable.BindTo(HitObject.ScaleBindable);
             pathBindable.BindTo(slider.PathBindable);
 
@@ -129,6 +96,67 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
             }, true);
         }
 
+        protected override void AddNestedHitObject(DrawableHitObject hitObject)
+        {
+            base.AddNestedHitObject(hitObject);
+
+            switch (hitObject)
+            {
+                case DrawableSliderHead head:
+                    headContainer.Child = head;
+                    break;
+
+                case DrawableSliderTail tail:
+                    tailContainer.Child = tail;
+                    break;
+
+                case DrawableSliderTick tick:
+                    tickContainer.Add(tick);
+                    break;
+
+                case DrawableRepeatPoint repeat:
+                    repeatContainer.Add(repeat);
+                    break;
+            }
+        }
+
+        protected override void ClearNestedHitObjects()
+        {
+            base.ClearNestedHitObjects();
+
+            headContainer.Clear();
+            tailContainer.Clear();
+            repeatContainer.Clear();
+            tickContainer.Clear();
+        }
+
+        protected override DrawableHitObject CreateNestedHitObject(HitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case SliderTailCircle tail:
+                    return new DrawableSliderTail(slider, tail);
+
+                case HitCircle head:
+                    return new DrawableSliderHead(slider, head) { OnShake = Shake };
+
+                case SliderTick tick:
+                    return new DrawableSliderTick(tick) { Position = tick.Position - slider.Position };
+
+                case RepeatPoint repeat:
+                    return new DrawableRepeatPoint(repeat, this) { Position = repeat.Position - slider.Position };
+            }
+
+            return base.CreateNestedHitObject(hitObject);
+        }
+
+        protected override void UpdateInitialTransforms()
+        {
+            base.UpdateInitialTransforms();
+
+            Body.FadeInFromZero(HitObject.TimeFadeIn);
+        }
+
         public readonly Bindable<bool> Tracking = new Bindable<bool>();
 
         protected override void Update()
@@ -139,9 +167,14 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
 
             double completionProgress = MathHelper.Clamp((Time.Current - slider.StartTime) / slider.Duration, 0, 1);
 
-            foreach (var c in components.OfType<ISliderProgress>()) c.UpdateProgress(completionProgress);
-            foreach (var c in components.OfType<ITrackSnaking>()) c.UpdateSnakingPosition(slider.Path.PositionAt(Body.SnakedStart ?? 0), slider.Path.PositionAt(Body.SnakedEnd ?? 0));
-            foreach (var t in components.OfType<IRequireTracking>()) t.Tracking = Ball.Tracking;
+            Ball.UpdateProgress(completionProgress);
+            Body.UpdateProgress(completionProgress);
+
+            foreach (DrawableHitObject hitObject in NestedHitObjects)
+            {
+                if (hitObject is ITrackSnaking s) s.UpdateSnakingPosition(slider.Path.PositionAt(Body.SnakedStart ?? 0), slider.Path.PositionAt(Body.SnakedEnd ?? 0));
+                if (hitObject is IRequireTracking t) t.Tracking = Ball.Tracking;
+            }
 
             Size = Body.Size;
             OriginPosition = Body.PathOffset;
@@ -187,7 +220,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
 
             ApplyResult(r =>
             {
-                var judgementsCount = NestedHitObjects.Count();
+                var judgementsCount = NestedHitObjects.Count;
                 var judgementsHit = NestedHitObjects.Count(h => h.IsHit);
 
                 var hitFraction = (double)judgementsHit / judgementsCount;
@@ -228,7 +261,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
             }
         }
 
-        public Drawable ProxiedLayer => HeadCircle.ApproachCircle;
+        public Drawable ProxiedLayer => HeadCircle.ProxiedLayer;
 
         public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => Body.ReceivePositionalInputAt(screenSpacePos);
     }

osu.Game.Rulesets.Osu/Objects/Drawables/Pieces/NumberPiece.cs

@@ -7,7 +7,6 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Effects;
 using osu.Game.Graphics.Sprites;
 using osuTK.Graphics;
-using osu.Framework.Graphics.Shapes;
 using osu.Game.Graphics;
 using osu.Game.Skinning;
 
@@ -30,17 +29,15 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables.Pieces
 
             Children = new Drawable[]
             {
-                new CircularContainer
+                new Container
                 {
                     Masking = true,
-                    Origin = Anchor.Centre,
                     EdgeEffect = new EdgeEffectParameters
                     {
                         Type = EdgeEffectType.Glow,
                         Radius = 60,
                         Colour = Color4.White.Opacity(0.5f),
                     },
-                    Child = new Box()
                 },
                 number = new SkinnableSpriteText(new OsuSkinComponent(OsuSkinComponents.HitCircleText), _ => new OsuSpriteText
                 {

osu.Game.Rulesets.Osu/Objects/OsuHitObject.cs

@@ -1,6 +1,7 @@
 // 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.Linq;
 using osu.Framework.Bindables;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Objects;
@@ -98,6 +99,15 @@ namespace osu.Game.Rulesets.Osu.Objects
             set => LastInComboBindable.Value = value;
         }
 
+        protected OsuHitObject()
+        {
+            StackHeightBindable.BindValueChanged(height =>
+            {
+                foreach (var nested in NestedHitObjects.OfType<OsuHitObject>())
+                    nested.StackHeight = height.NewValue;
+            });
+        }
+
         protected override void ApplyDefaultsToSelf(ControlPointInfo controlPointInfo, BeatmapDifficulty difficulty)
         {
             base.ApplyDefaultsToSelf(controlPointInfo, difficulty);

osu.Game.Rulesets.Osu/Objects/Slider.cs

@@ -163,6 +163,7 @@ namespace osu.Game.Rulesets.Osu.Objects
                         {
                             StartTime = e.Time,
                             Position = Position,
+                            StackHeight = StackHeight,
                             Samples = getNodeSamples(0),
                             SampleControlPoint = SampleControlPoint,
                         });
@@ -176,6 +177,7 @@ namespace osu.Game.Rulesets.Osu.Objects
                         {
                             StartTime = e.Time,
                             Position = EndPosition,
+                            StackHeight = StackHeight
                         });
                         break;
 

osu.Game.Rulesets.Osu/Resources/Testing/Beatmaps/old-stacking-expected-conversion.json

@@ -143,14 +143,14 @@
             "Objects": [{
                 "StartTime": 34989,
                 "EndTime": 34989,
-                "X": 163,
-                "Y": 138
+                "X": 156.597382,
+                "Y": 131.597382
             },
                 {
                     "StartTime": 35018,
                     "EndTime": 35018,
-                    "X": 188,
-                    "Y": 138
+                    "X": 181.597382,
+                    "Y": 131.597382
                 }
             ]
         },
@@ -159,14 +159,14 @@
             "Objects": [{
                 "StartTime": 35106,
                 "EndTime": 35106,
-                "X": 163,
-                "Y": 138
+                "X": 159.798691,
+                "Y": 134.798691
             },
                 {
                     "StartTime": 35135,
                     "EndTime": 35135,
-                    "X": 188,
-                    "Y": 138
+                    "X": 184.798691,
+                    "Y": 134.798691
                 }
             ]
         },
@@ -191,20 +191,20 @@
             "Objects": [{
                 "StartTime": 35695,
                 "EndTime": 35695,
-                "X": 166,
-                "Y": 76
+                "X": 162.798691,
+                "Y": 72.79869
             },
                 {
                     "StartTime": 35871,
                     "EndTime": 35871,
-                    "X": 240.99855,
-                    "Y": 75.53417
+                    "X": 237.797241,
+                    "Y": 72.33286
                 },
                 {
                     "StartTime": 36011,
                     "EndTime": 36011,
-                    "X": 315.9971,
-                    "Y": 75.0683441
+                    "X": 312.795776,
+                    "Y": 71.8670349
                 }
             ]
         },
@@ -235,20 +235,20 @@
             "Objects": [{
                 "StartTime": 36518,
                 "EndTime": 36518,
-                "X": 166,
-                "Y": 76
+                "X": 169.201309,
+                "Y": 79.20131
             },
                 {
                     "StartTime": 36694,
                     "EndTime": 36694,
-                    "X": 240.99855,
-                    "Y": 75.53417
+                    "X": 244.19986,
+                    "Y": 78.73548
                 },
                 {
                     "StartTime": 36834,
                     "EndTime": 36834,
-                    "X": 315.9971,
-                    "Y": 75.0683441
+                    "X": 319.198425,
+                    "Y": 78.26965
                 }
             ]
         },
@@ -257,20 +257,20 @@
             "Objects": [{
                 "StartTime": 36929,
                 "EndTime": 36929,
-                "X": 315,
-                "Y": 75
+                "X": 324.603943,
+                "Y": 84.6039352
             },
                 {
                     "StartTime": 37105,
                     "EndTime": 37105,
-                    "X": 240.001526,
-                    "Y": 75.47769
+                    "X": 249.605469,
+                    "Y": 85.08163
                 },
                 {
                     "StartTime": 37245,
                     "EndTime": 37245,
-                    "X": 165.003052,
-                    "Y": 75.95539
+                    "X": 174.607,
+                    "Y": 85.5593262
                 }
             ]
         }

osu.Game.Rulesets.Osu/UI/Cursor/OsuCursor.cs

@@ -2,14 +2,11 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using osu.Framework.Allocation;
-using osu.Framework.Bindables;
 using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Effects;
 using osu.Framework.Graphics.Shapes;
-using osu.Game.Beatmaps;
-using osu.Game.Configuration;
 using osu.Game.Rulesets.Osu.Skinning;
 using osu.Game.Skinning;
 using osuTK;
@@ -23,12 +20,7 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
 
         private bool cursorExpand;
 
-        private Bindable<float> cursorScale;
-        private Bindable<bool> autoCursorScale;
-        private readonly IBindable<WorkingBeatmap> beatmap = new Bindable<WorkingBeatmap>();
-
         private Container expandTarget;
-        private Drawable scaleTarget;
 
         public OsuCursor()
         {
@@ -43,43 +35,19 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
         }
 
         [BackgroundDependencyLoader]
-        private void load(OsuConfigManager config, IBindable<WorkingBeatmap> beatmap)
+        private void load()
         {
             InternalChild = expandTarget = new Container
             {
                 RelativeSizeAxes = Axes.Both,
                 Origin = Anchor.Centre,
                 Anchor = Anchor.Centre,
-                Child = scaleTarget = new SkinnableDrawable(new OsuSkinComponent(OsuSkinComponents.Cursor), _ => new DefaultCursor(), confineMode: ConfineMode.NoScaling)
+                Child = new SkinnableDrawable(new OsuSkinComponent(OsuSkinComponents.Cursor), _ => new DefaultCursor(), confineMode: ConfineMode.NoScaling)
                 {
                     Origin = Anchor.Centre,
                     Anchor = Anchor.Centre,
                 }
             };
-
-            this.beatmap.BindTo(beatmap);
-            this.beatmap.ValueChanged += _ => calculateScale();
-
-            cursorScale = config.GetBindable<float>(OsuSetting.GameplayCursorSize);
-            cursorScale.ValueChanged += _ => calculateScale();
-
-            autoCursorScale = config.GetBindable<bool>(OsuSetting.AutoCursorSize);
-            autoCursorScale.ValueChanged += _ => calculateScale();
-
-            calculateScale();
-        }
-
-        private void calculateScale()
-        {
-            float scale = cursorScale.Value;
-
-            if (autoCursorScale.Value && beatmap.Value != null)
-            {
-                // if we have a beatmap available, let's get its circle size to figure out an automatic cursor scale modifier.
-                scale *= 1f - 0.7f * (1f + beatmap.Value.BeatmapInfo.BaseDifficulty.CircleSize - BeatmapDifficulty.DEFAULT_DIFFICULTY) / BeatmapDifficulty.DEFAULT_DIFFICULTY;
-            }
-
-            scaleTarget.Scale = new Vector2(scale);
         }
 
         private const float pressed_scale = 1.2f;

osu.Game.Rulesets.Osu/UI/Cursor/OsuCursorContainer.cs

@@ -8,6 +8,8 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Textures;
 using osu.Framework.Input.Bindings;
+using osu.Game.Beatmaps;
+using osu.Game.Configuration;
 using osu.Game.Rulesets.Osu.Configuration;
 using osu.Game.Rulesets.UI;
 using osu.Game.Skinning;
@@ -27,6 +29,11 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
 
         private readonly Drawable cursorTrail;
 
+        public Bindable<float> CursorScale;
+        private Bindable<float> userCursorScale;
+        private Bindable<bool> autoCursorScale;
+        private readonly IBindable<WorkingBeatmap> beatmap = new Bindable<WorkingBeatmap>();
+
         public OsuCursorContainer()
         {
             InternalChild = fadeContainer = new Container
@@ -37,9 +44,36 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
         }
 
         [BackgroundDependencyLoader(true)]
-        private void load(OsuRulesetConfigManager config)
+        private void load(OsuConfigManager config, OsuRulesetConfigManager rulesetConfig, IBindable<WorkingBeatmap> beatmap)
         {
-            config?.BindWith(OsuRulesetSetting.ShowCursorTrail, showTrail);
+            rulesetConfig?.BindWith(OsuRulesetSetting.ShowCursorTrail, showTrail);
+
+            this.beatmap.BindTo(beatmap);
+            this.beatmap.ValueChanged += _ => calculateScale();
+
+            userCursorScale = config.GetBindable<float>(OsuSetting.GameplayCursorSize);
+            userCursorScale.ValueChanged += _ => calculateScale();
+
+            autoCursorScale = config.GetBindable<bool>(OsuSetting.AutoCursorSize);
+            autoCursorScale.ValueChanged += _ => calculateScale();
+
+            CursorScale = new Bindable<float>();
+            CursorScale.ValueChanged += e => ActiveCursor.Scale = cursorTrail.Scale = new Vector2(e.NewValue);
+
+            calculateScale();
+        }
+
+        private void calculateScale()
+        {
+            float scale = userCursorScale.Value;
+
+            if (autoCursorScale.Value && beatmap.Value != null)
+            {
+                // if we have a beatmap available, let's get its circle size to figure out an automatic cursor scale modifier.
+                scale *= 1f - 0.7f * (1f + beatmap.Value.BeatmapInfo.BaseDifficulty.CircleSize - BeatmapDifficulty.DEFAULT_DIFFICULTY) / BeatmapDifficulty.DEFAULT_DIFFICULTY;
+            }
+
+            CursorScale.Value = scale;
         }
 
         protected override void LoadComplete()
@@ -95,13 +129,13 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
         protected override void PopIn()
         {
             fadeContainer.FadeTo(1, 300, Easing.OutQuint);
-            ActiveCursor.ScaleTo(1, 400, Easing.OutQuint);
+            ActiveCursor.ScaleTo(CursorScale.Value, 400, Easing.OutQuint);
         }
 
         protected override void PopOut()
         {
             fadeContainer.FadeTo(0.05f, 450, Easing.OutQuint);
-            ActiveCursor.ScaleTo(0.8f, 450, Easing.OutQuint);
+            ActiveCursor.ScaleTo(CursorScale.Value * 0.8f, 450, Easing.OutQuint);
         }
 
         private class DefaultCursorTrail : CursorTrail

osu.Game.Rulesets.Osu/UI/OsuPlayfield.cs

@@ -57,21 +57,15 @@ namespace osu.Game.Rulesets.Osu.UI
         public override void Add(DrawableHitObject h)
         {
             h.OnNewResult += onNewResult;
-
-            if (h is IDrawableHitObjectWithProxiedApproach c)
+            h.OnLoadComplete += d =>
             {
-                var original = c.ProxiedLayer;
-
-                // Hitobjects only have lifetimes set on LoadComplete. For nested hitobjects (e.g. SliderHeads), this only happens when the parenting slider becomes visible.
-                // This delegation is required to make sure that the approach circles for those not-yet-loaded objects aren't added prematurely.
-                original.OnLoadComplete += addApproachCircleProxy;
-            }
+                if (d is IDrawableHitObjectWithProxiedApproach c)
+                    approachCircles.Add(c.ProxiedLayer.CreateProxy());
+            };
 
             base.Add(h);
         }
 
-        private void addApproachCircleProxy(Drawable d) => approachCircles.Add(d.CreateProxy());
-
         public override void PostProcess()
         {
             connectionLayer.HitObjects = HitObjectContainer.Objects.Select(d => d.HitObject).OfType<OsuHitObject>();

osu.Game.Rulesets.Osu/UI/OsuResumeOverlay.cs

@@ -1,15 +1,15 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// 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 osu.Framework.Allocation;
+using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Input.Bindings;
 using osu.Framework.Input.Events;
 using osu.Game.Rulesets.Osu.UI.Cursor;
-using osu.Game.Rulesets.UI;
 using osu.Game.Screens.Play;
 using osuTK;
 using osuTK.Graphics;
@@ -18,9 +18,11 @@ namespace osu.Game.Rulesets.Osu.UI
 {
     public class OsuResumeOverlay : ResumeOverlay
     {
+        private Container cursorScaleContainer;
         private OsuClickToResumeCursor clickToResumeCursor;
 
-        private GameplayCursorContainer localCursorContainer;
+        private OsuCursorContainer localCursorContainer;
+        private Bindable<float> localCursorScale;
 
         public override CursorContainer LocalCursor => State.Value == Visibility.Visible ? localCursorContainer : null;
 
@@ -29,22 +31,35 @@ namespace osu.Game.Rulesets.Osu.UI
         [BackgroundDependencyLoader]
         private void load()
         {
-            Add(clickToResumeCursor = new OsuClickToResumeCursor { ResumeRequested = Resume });
+            Add(cursorScaleContainer = new Container
+            {
+                RelativePositionAxes = Axes.Both,
+                Child = clickToResumeCursor = new OsuClickToResumeCursor { ResumeRequested = Resume }
+            });
         }
 
         public override void Show()
         {
             base.Show();
-            clickToResumeCursor.ShowAt(GameplayCursor.ActiveCursor.Position);
+            GameplayCursor.ActiveCursor.Hide();
+            cursorScaleContainer.MoveTo(GameplayCursor.ActiveCursor.Position);
+            clickToResumeCursor.Appear();
 
             if (localCursorContainer == null)
+            {
                 Add(localCursorContainer = new OsuCursorContainer());
+
+                localCursorScale = new Bindable<float>();
+                localCursorScale.BindTo(localCursorContainer.CursorScale);
+                localCursorScale.BindValueChanged(scale => cursorScaleContainer.Scale = new Vector2(scale.NewValue), true);
+            }
         }
 
         public override void Hide()
         {
             localCursorContainer?.Expire();
             localCursorContainer = null;
+            GameplayCursor.ActiveCursor.Show();
 
             base.Hide();
         }
@@ -82,7 +97,7 @@ namespace osu.Game.Rulesets.Osu.UI
                     case OsuAction.RightButton:
                         if (!IsHovered) return false;
 
-                        this.ScaleTo(new Vector2(2), TRANSITION_TIME, Easing.OutQuint);
+                        this.ScaleTo(2, TRANSITION_TIME, Easing.OutQuint);
 
                         ResumeRequested?.Invoke();
                         return true;
@@ -93,11 +108,10 @@ namespace osu.Game.Rulesets.Osu.UI
 
             public bool OnReleased(OsuAction action) => false;
 
-            public void ShowAt(Vector2 activeCursorPosition) => Schedule(() =>
+            public void Appear() => Schedule(() =>
             {
                 updateColour();
-                this.MoveTo(activeCursorPosition);
-                this.ScaleTo(new Vector2(4)).Then().ScaleTo(Vector2.One, 1000, Easing.OutQuint);
+                this.ScaleTo(4).Then().ScaleTo(1, 1000, Easing.OutQuint);
             });
 
             private void updateColour()

osu.Game.Rulesets.Taiko.Tests/TestSceneTaikoPlayfield.cs

@@ -66,7 +66,7 @@ namespace osu.Game.Rulesets.Taiko.Tests
             AddStep("Reset height", () => changePlayfieldSize(6));
 
             var controlPointInfo = new ControlPointInfo();
-            controlPointInfo.TimingPoints.Add(new TimingControlPoint());
+            controlPointInfo.Add(0, new TimingControlPoint());
 
             WorkingBeatmap beatmap = CreateWorkingBeatmap(new Beatmap
             {
@@ -142,7 +142,7 @@ namespace osu.Game.Rulesets.Taiko.Tests
             HitResult hitResult = RNG.Next(2) == 0 ? HitResult.Good : HitResult.Great;
 
             var cpi = new ControlPointInfo();
-            cpi.EffectPoints.Add(new EffectControlPoint { KiaiMode = kiai });
+            cpi.Add(0, new EffectControlPoint { KiaiMode = kiai });
 
             Hit hit = new Hit();
             hit.ApplyDefaults(cpi, new BeatmapDifficulty());
@@ -157,7 +157,7 @@ namespace osu.Game.Rulesets.Taiko.Tests
             HitResult hitResult = RNG.Next(2) == 0 ? HitResult.Good : HitResult.Great;
 
             var cpi = new ControlPointInfo();
-            cpi.EffectPoints.Add(new EffectControlPoint { KiaiMode = kiai });
+            cpi.Add(0, new EffectControlPoint { KiaiMode = kiai });
 
             Hit hit = new Hit();
             hit.ApplyDefaults(cpi, new BeatmapDifficulty());
@@ -239,7 +239,7 @@ namespace osu.Game.Rulesets.Taiko.Tests
         private class TestStrongNestedHit : DrawableStrongNestedHit
         {
             public TestStrongNestedHit(DrawableHitObject mainObject)
-                : base(null, mainObject)
+                : base(new StrongHitObject { StartTime = mainObject.HitObject.StartTime }, mainObject)
             {
             }
 

osu.Game.Rulesets.Taiko/Audio/DrumSampleMapping.cs

@@ -19,12 +19,7 @@ namespace osu.Game.Rulesets.Taiko.Audio
         {
             this.controlPoints = controlPoints;
 
-            IEnumerable<SampleControlPoint> samplePoints;
-            if (controlPoints.SamplePoints.Count == 0)
-                // Get the default sample point
-                samplePoints = new[] { controlPoints.SamplePointAt(double.MinValue) };
-            else
-                samplePoints = controlPoints.SamplePoints;
+            IEnumerable<SampleControlPoint> samplePoints = controlPoints.SamplePoints.Count == 0 ? new[] { controlPoints.SamplePointAt(double.MinValue) } : controlPoints.SamplePoints;
 
             foreach (var s in samplePoints)
             {

osu.Game.Rulesets.Taiko/Objects/Drawables/DrawableDrumRoll.cs

@@ -12,6 +12,7 @@ using osu.Game.Rulesets.Taiko.Objects.Drawables.Pieces;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Game.Rulesets.Judgements;
+using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Scoring;
 
 namespace osu.Game.Rulesets.Taiko.Objects.Drawables
@@ -28,31 +29,18 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
         /// </summary>
         private int rollingHits;
 
+        private readonly Container<DrawableDrumRollTick> tickContainer;
+
+        private Color4 colourIdle;
+        private Color4 colourEngaged;
+
         public DrawableDrumRoll(DrumRoll drumRoll)
             : base(drumRoll)
         {
             RelativeSizeAxes = Axes.Y;
-
-            Container<DrawableDrumRollTick> tickContainer;
             MainPiece.Add(tickContainer = new Container<DrawableDrumRollTick> { RelativeSizeAxes = Axes.Both });
-
-            foreach (var tick in drumRoll.NestedHitObjects.OfType<DrumRollTick>())
-            {
-                var newTick = new DrawableDrumRollTick(tick);
-                newTick.OnNewResult += onNewTickResult;
-
-                AddNested(newTick);
-                tickContainer.Add(newTick);
-            }
         }
 
-        protected override TaikoPiece CreateMainPiece() => new ElongatedCirclePiece();
-
-        public override bool OnPressed(TaikoAction action) => false;
-
-        private Color4 colourIdle;
-        private Color4 colourEngaged;
-
         [BackgroundDependencyLoader]
         private void load(OsuColour colours)
         {
@@ -60,8 +48,51 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
             colourEngaged = colours.YellowDarker;
         }
 
-        private void onNewTickResult(DrawableHitObject obj, JudgementResult result)
+        protected override void LoadComplete()
         {
+            base.LoadComplete();
+
+            OnNewResult += onNewResult;
+        }
+
+        protected override void AddNestedHitObject(DrawableHitObject hitObject)
+        {
+            base.AddNestedHitObject(hitObject);
+
+            switch (hitObject)
+            {
+                case DrawableDrumRollTick tick:
+                    tickContainer.Add(tick);
+                    break;
+            }
+        }
+
+        protected override void ClearNestedHitObjects()
+        {
+            base.ClearNestedHitObjects();
+            tickContainer.Clear();
+        }
+
+        protected override DrawableHitObject CreateNestedHitObject(HitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case DrumRollTick tick:
+                    return new DrawableDrumRollTick(tick);
+            }
+
+            return base.CreateNestedHitObject(hitObject);
+        }
+
+        protected override TaikoPiece CreateMainPiece() => new ElongatedCirclePiece();
+
+        public override bool OnPressed(TaikoAction action) => false;
+
+        private void onNewResult(DrawableHitObject obj, JudgementResult result)
+        {
+            if (!(obj is DrawableDrumRollTick))
+                return;
+
             if (result.Type > HitResult.Miss)
                 rollingHits++;
             else

osu.Game.Rulesets.Taiko/Objects/Drawables/DrawableSwell.cs

@@ -2,7 +2,6 @@
 // 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.Extensions.Color4Extensions;
@@ -14,6 +13,7 @@ using osu.Game.Rulesets.Taiko.Objects.Drawables.Pieces;
 using osuTK;
 using osuTK.Graphics;
 using osu.Framework.Graphics.Shapes;
+using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Scoring;
 
 namespace osu.Game.Rulesets.Taiko.Objects.Drawables
@@ -30,8 +30,7 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
         /// </summary>
         private const double ring_appear_offset = 100;
 
-        private readonly List<DrawableSwellTick> ticks = new List<DrawableSwellTick>();
-
+        private readonly Container<DrawableSwellTick> ticks;
         private readonly Container bodyContainer;
         private readonly CircularContainer targetRing;
         private readonly CircularContainer expandingRing;
@@ -108,16 +107,9 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
                 }
             });
 
+            AddInternal(ticks = new Container<DrawableSwellTick> { RelativeSizeAxes = Axes.Both });
+
             MainPiece.Add(symbol = new SwellSymbolPiece());
-
-            foreach (var tick in HitObject.NestedHitObjects.OfType<SwellTick>())
-            {
-                var vis = new DrawableSwellTick(tick);
-
-                ticks.Add(vis);
-                AddInternal(vis);
-                AddNested(vis);
-            }
         }
 
         [BackgroundDependencyLoader]
@@ -136,11 +128,49 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
             Width *= Parent.RelativeChildSize.X;
         }
 
+        protected override void AddNestedHitObject(DrawableHitObject hitObject)
+        {
+            base.AddNestedHitObject(hitObject);
+
+            switch (hitObject)
+            {
+                case DrawableSwellTick tick:
+                    ticks.Add(tick);
+                    break;
+            }
+        }
+
+        protected override void ClearNestedHitObjects()
+        {
+            base.ClearNestedHitObjects();
+            ticks.Clear();
+        }
+
+        protected override DrawableHitObject CreateNestedHitObject(HitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case SwellTick tick:
+                    return new DrawableSwellTick(tick);
+            }
+
+            return base.CreateNestedHitObject(hitObject);
+        }
+
         protected override void CheckForResult(bool userTriggered, double timeOffset)
         {
             if (userTriggered)
             {
-                var nextTick = ticks.Find(j => !j.IsHit);
+                DrawableSwellTick nextTick = null;
+
+                foreach (var t in ticks)
+                {
+                    if (!t.IsHit)
+                    {
+                        nextTick = t;
+                        break;
+                    }
+                }
 
                 nextTick?.TriggerResult(HitResult.Great);
 

osu.Game.Rulesets.Taiko/Objects/Drawables/DrawableTaikoHitObject.cs

@@ -11,6 +11,7 @@ using osu.Game.Audio;
 using System.Collections.Generic;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Primitives;
+using osu.Game.Rulesets.Objects;
 
 namespace osu.Game.Rulesets.Taiko.Objects.Drawables
 {
@@ -109,11 +110,12 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
     {
         public override Vector2 OriginPosition => new Vector2(DrawHeight / 2);
 
-        protected readonly Vector2 BaseSize;
+        public new TaikoHitType HitObject;
 
+        protected readonly Vector2 BaseSize;
         protected readonly TaikoPiece MainPiece;
 
-        public new TaikoHitType HitObject;
+        private readonly Container<DrawableStrongNestedHit> strongHitContainer;
 
         protected DrawableTaikoHitObject(TaikoHitType hitObject)
             : base(hitObject)
@@ -129,17 +131,38 @@ namespace osu.Game.Rulesets.Taiko.Objects.Drawables
             Content.Add(MainPiece = CreateMainPiece());
             MainPiece.KiaiMode = HitObject.Kiai;
 
-            var strongObject = HitObject.NestedHitObjects.OfType<StrongHitObject>().FirstOrDefault();
+            AddInternal(strongHitContainer = new Container<DrawableStrongNestedHit>());
+        }
 
-            if (strongObject != null)
+        protected override void AddNestedHitObject(DrawableHitObject hitObject)
+        {
+            base.AddNestedHitObject(hitObject);
+
+            switch (hitObject)
             {
-                var strongHit = CreateStrongHit(strongObject);
-
-                AddNested(strongHit);
-                AddInternal(strongHit);
+                case DrawableStrongNestedHit strong:
+                    strongHitContainer.Add(strong);
+                    break;
             }
         }
 
+        protected override void ClearNestedHitObjects()
+        {
+            base.ClearNestedHitObjects();
+            strongHitContainer.Clear();
+        }
+
+        protected override DrawableHitObject CreateNestedHitObject(HitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case StrongHitObject strong:
+                    return CreateStrongHit(strong);
+            }
+
+            return base.CreateNestedHitObject(hitObject);
+        }
+
         // Normal and clap samples are handled by the drum
         protected override IEnumerable<HitSampleInfo> GetSamples() => HitObject.Samples.Where(s => s.Name != HitSampleInfo.HIT_NORMAL && s.Name != HitSampleInfo.HIT_CLAP);
 

osu.Game.Tests/Beatmaps/Formats/LegacyBeatmapDecoderTest.cs

@@ -167,9 +167,9 @@ namespace osu.Game.Tests.Beatmaps.Formats
                 var controlPoints = beatmap.ControlPointInfo;
 
                 Assert.AreEqual(4, controlPoints.TimingPoints.Count);
-                Assert.AreEqual(42, controlPoints.DifficultyPoints.Count);
-                Assert.AreEqual(42, controlPoints.SamplePoints.Count);
-                Assert.AreEqual(42, controlPoints.EffectPoints.Count);
+                Assert.AreEqual(5, controlPoints.DifficultyPoints.Count);
+                Assert.AreEqual(34, controlPoints.SamplePoints.Count);
+                Assert.AreEqual(8, controlPoints.EffectPoints.Count);
 
                 var timingPoint = controlPoints.TimingPointAt(0);
                 Assert.AreEqual(956, timingPoint.Time);
@@ -191,7 +191,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
                 Assert.AreEqual(1.0, difficultyPoint.SpeedMultiplier);
 
                 difficultyPoint = controlPoints.DifficultyPointAt(48428);
-                Assert.AreEqual(48428, difficultyPoint.Time);
+                Assert.AreEqual(0, difficultyPoint.Time);
                 Assert.AreEqual(1.0, difficultyPoint.SpeedMultiplier);
 
                 difficultyPoint = controlPoints.DifficultyPointAt(116999);
@@ -224,7 +224,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
                 Assert.IsFalse(effectPoint.OmitFirstBarLine);
 
                 effectPoint = controlPoints.EffectPointAt(119637);
-                Assert.AreEqual(119637, effectPoint.Time);
+                Assert.AreEqual(95901, effectPoint.Time);
                 Assert.IsFalse(effectPoint.KiaiMode);
                 Assert.IsFalse(effectPoint.OmitFirstBarLine);
             }
@@ -262,6 +262,21 @@ namespace osu.Game.Tests.Beatmaps.Formats
             }
         }
 
+        [Test]
+        public void TestTimingPointResetsSpeedMultiplier()
+        {
+            var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
+
+            using (var resStream = TestResources.OpenResource("timingpoint-speedmultiplier-reset.osu"))
+            using (var stream = new LineBufferedReader(resStream))
+            {
+                var controlPoints = decoder.Decode(stream).ControlPointInfo;
+
+                Assert.That(controlPoints.DifficultyPointAt(0).SpeedMultiplier, Is.EqualTo(0.5).Within(0.1));
+                Assert.That(controlPoints.DifficultyPointAt(2000).SpeedMultiplier, Is.EqualTo(1).Within(0.1));
+            }
+        }
+
         [Test]
         public void TestDecodeBeatmapColours()
         {
@@ -362,6 +377,23 @@ namespace osu.Game.Tests.Beatmaps.Formats
             }
         }
 
+        [Test]
+        public void TestDecodeControlPointDifficultyChange()
+        {
+            var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
+
+            using (var resStream = TestResources.OpenResource("controlpoint-difficulty-multiplier.osu"))
+            using (var stream = new LineBufferedReader(resStream))
+            {
+                var controlPointInfo = decoder.Decode(stream).ControlPointInfo;
+
+                Assert.That(controlPointInfo.DifficultyPointAt(5).SpeedMultiplier, Is.EqualTo(1));
+                Assert.That(controlPointInfo.DifficultyPointAt(1000).SpeedMultiplier, Is.EqualTo(10));
+                Assert.That(controlPointInfo.DifficultyPointAt(2000).SpeedMultiplier, Is.EqualTo(1.8518518518518519d));
+                Assert.That(controlPointInfo.DifficultyPointAt(3000).SpeedMultiplier, Is.EqualTo(0.5));
+            }
+        }
+
         [Test]
         public void TestDecodeControlPointCustomSampleBank()
         {

osu.Game.Tests/Chat/MessageFormatterTests.cs

@@ -273,6 +273,96 @@ namespace osu.Game.Tests.Chat
             Assert.AreEqual(21, result.Links[0].Length);
         }
 
+        [Test]
+        public void TestMarkdownFormatLinkWithInlineTitle()
+        {
+            Message result = MessageFormatter.FormatMessage(new Message { Content = "I haven't seen [this link format](https://osu.ppy.sh \"osu!\") before..." });
+
+            Assert.AreEqual("I haven't seen this link format before...", result.DisplayContent);
+            Assert.AreEqual(1, result.Links.Count);
+            Assert.AreEqual("https://osu.ppy.sh", result.Links[0].Url);
+            Assert.AreEqual(15, result.Links[0].Index);
+            Assert.AreEqual(16, result.Links[0].Length);
+        }
+
+        [Test]
+        public void TestMarkdownFormatLinkWithInlineTitleAndEscapedQuotes()
+        {
+            Message result = MessageFormatter.FormatMessage(new Message { Content = "I haven't seen [this link format](https://osu.ppy.sh \"inner quote \\\" just to confuse \") before..." });
+
+            Assert.AreEqual("I haven't seen this link format before...", result.DisplayContent);
+            Assert.AreEqual(1, result.Links.Count);
+            Assert.AreEqual("https://osu.ppy.sh", result.Links[0].Url);
+            Assert.AreEqual(15, result.Links[0].Index);
+            Assert.AreEqual(16, result.Links[0].Length);
+        }
+
+        [Test]
+        public void TestMarkdownFormatLinkWithUrlInTextAndInlineTitle()
+        {
+            Message result = MessageFormatter.FormatMessage(new Message { Content = "I haven't seen [https://osu.ppy.sh](https://osu.ppy.sh \"https://osu.ppy.sh\") before..." });
+
+            Assert.AreEqual("I haven't seen https://osu.ppy.sh before...", result.DisplayContent);
+            Assert.AreEqual(1, result.Links.Count);
+            Assert.AreEqual("https://osu.ppy.sh", result.Links[0].Url);
+            Assert.AreEqual(15, result.Links[0].Index);
+            Assert.AreEqual(18, result.Links[0].Length);
+        }
+
+        [Test]
+        public void TestMarkdownFormatLinkWithUrlAndTextInTitle()
+        {
+            Message result = MessageFormatter.FormatMessage(new Message { Content = "I haven't seen [oh no, text here! https://osu.ppy.sh](https://osu.ppy.sh) before..." });
+
+            Assert.AreEqual("I haven't seen oh no, text here! https://osu.ppy.sh before...", result.DisplayContent);
+            Assert.AreEqual(1, result.Links.Count);
+            Assert.AreEqual("https://osu.ppy.sh", result.Links[0].Url);
+            Assert.AreEqual(15, result.Links[0].Index);
+            Assert.AreEqual(36, result.Links[0].Length);
+        }
+
+        [Test]
+        public void TestMarkdownFormatLinkWithMisleadingUrlInText()
+        {
+            Message result = MessageFormatter.FormatMessage(new Message { Content = "I haven't seen [https://google.com](https://osu.ppy.sh) before..." });
+
+            Assert.AreEqual("I haven't seen https://google.com before...", result.DisplayContent);
+            Assert.AreEqual(1, result.Links.Count);
+            Assert.AreEqual("https://osu.ppy.sh", result.Links[0].Url);
+            Assert.AreEqual(15, result.Links[0].Index);
+            Assert.AreEqual(18, result.Links[0].Length);
+        }
+
+        [Test]
+        public void TestMarkdownFormatLinkThatContractsIntoLargerLink()
+        {
+            Message result = MessageFormatter.FormatMessage(new Message { Content = "super broken https://[osu.ppy](https://reddit.com).sh/" });
+
+            Assert.AreEqual("super broken https://osu.ppy.sh/", result.DisplayContent);
+            Assert.AreEqual(1, result.Links.Count);
+            Assert.AreEqual("https://reddit.com", result.Links[0].Url);
+            Assert.AreEqual(21, result.Links[0].Index);
+            Assert.AreEqual(7, result.Links[0].Length);
+        }
+
+        [Test]
+        public void TestMarkdownFormatLinkDirectlyNextToRawLink()
+        {
+            // the raw link has a port at the end of it, so that the raw link regex terminates at the port and doesn't consume display text from the formatted one
+            Message result = MessageFormatter.FormatMessage(new Message { Content = "https://localhost:8080[https://osu.ppy.sh](https://osu.ppy.sh) should be two links" });
+
+            Assert.AreEqual("https://localhost:8080https://osu.ppy.sh should be two links", result.DisplayContent);
+            Assert.AreEqual(2, result.Links.Count);
+
+            Assert.AreEqual("https://localhost:8080", result.Links[0].Url);
+            Assert.AreEqual(0, result.Links[0].Index);
+            Assert.AreEqual(22, result.Links[0].Length);
+
+            Assert.AreEqual("https://osu.ppy.sh", result.Links[1].Url);
+            Assert.AreEqual(22, result.Links[1].Index);
+            Assert.AreEqual(18, result.Links[1].Length);
+        }
+
         [Test]
         public void TestChannelLink()
         {

osu.Game.Tests/Editor/TestSceneHitObjectComposerDistanceSnapping.cs

@@ -0,0 +1,194 @@
+// 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 NUnit.Framework;
+using osu.Framework.Testing;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Osu;
+using osu.Game.Rulesets.Osu.Edit;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Screens.Edit;
+using osu.Game.Tests.Visual;
+
+namespace osu.Game.Tests.Editor
+{
+    [HeadlessTest]
+    public class TestSceneHitObjectComposerDistanceSnapping : EditorClockTestScene
+    {
+        private TestHitObjectComposer composer;
+
+        [SetUp]
+        public void Setup() => Schedule(() =>
+        {
+            Child = composer = new TestHitObjectComposer();
+
+            BeatDivisor.Value = 1;
+
+            composer.EditorBeatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = 1;
+            composer.EditorBeatmap.ControlPointInfo.Clear();
+
+            composer.EditorBeatmap.ControlPointInfo.Add(0, new DifficultyControlPoint { SpeedMultiplier = 1 });
+            composer.EditorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = 1000 });
+        });
+
+        [TestCase(1)]
+        [TestCase(2)]
+        public void TestSliderMultiplier(float multiplier)
+        {
+            AddStep($"set multiplier = {multiplier}", () => composer.EditorBeatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = multiplier);
+
+            assertSnapDistance(100 * multiplier);
+        }
+
+        [TestCase(1)]
+        [TestCase(2)]
+        public void TestSpeedMultiplier(float multiplier)
+        {
+            AddStep($"set multiplier = {multiplier}", () =>
+            {
+                composer.EditorBeatmap.ControlPointInfo.Clear();
+                composer.EditorBeatmap.ControlPointInfo.Add(0, new DifficultyControlPoint { SpeedMultiplier = multiplier });
+            });
+
+            assertSnapDistance(100 * multiplier);
+        }
+
+        [TestCase(1)]
+        [TestCase(2)]
+        public void TestBeatDivisor(int divisor)
+        {
+            AddStep($"set divisor = {divisor}", () => BeatDivisor.Value = divisor);
+
+            assertSnapDistance(100f / divisor);
+        }
+
+        [Test]
+        public void TestConvertDurationToDistance()
+        {
+            assertDurationToDistance(500, 50);
+            assertDurationToDistance(1000, 100);
+
+            AddStep("set slider multiplier = 2", () => composer.EditorBeatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = 2);
+
+            assertDurationToDistance(500, 100);
+            assertDurationToDistance(1000, 200);
+
+            AddStep("set beat length = 500", () =>
+            {
+                composer.EditorBeatmap.ControlPointInfo.Clear();
+                composer.EditorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = 500 });
+            });
+
+            assertDurationToDistance(500, 200);
+            assertDurationToDistance(1000, 400);
+        }
+
+        [Test]
+        public void TestConvertDistanceToDuration()
+        {
+            assertDistanceToDuration(50, 500);
+            assertDistanceToDuration(100, 1000);
+
+            AddStep("set slider multiplier = 2", () => composer.EditorBeatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = 2);
+
+            assertDistanceToDuration(100, 500);
+            assertDistanceToDuration(200, 1000);
+
+            AddStep("set beat length = 500", () =>
+            {
+                composer.EditorBeatmap.ControlPointInfo.Clear();
+                composer.EditorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = 500 });
+            });
+
+            assertDistanceToDuration(200, 500);
+            assertDistanceToDuration(400, 1000);
+        }
+
+        [Test]
+        public void TestGetSnappedDurationFromDistance()
+        {
+            assertSnappedDuration(50, 0);
+            assertSnappedDuration(100, 1000);
+            assertSnappedDuration(150, 1000);
+            assertSnappedDuration(200, 2000);
+            assertSnappedDuration(250, 2000);
+
+            AddStep("set slider multiplier = 2", () => composer.EditorBeatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = 2);
+
+            assertSnappedDuration(50, 0);
+            assertSnappedDuration(100, 0);
+            assertSnappedDuration(150, 0);
+            assertSnappedDuration(200, 1000);
+            assertSnappedDuration(250, 1000);
+
+            AddStep("set beat length = 500", () =>
+            {
+                composer.EditorBeatmap.ControlPointInfo.Clear();
+                composer.EditorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = 500 });
+            });
+
+            assertSnappedDuration(50, 0);
+            assertSnappedDuration(100, 0);
+            assertSnappedDuration(150, 0);
+            assertSnappedDuration(200, 500);
+            assertSnappedDuration(250, 500);
+            assertSnappedDuration(400, 1000);
+        }
+
+        [Test]
+        public void GetSnappedDistanceFromDistance()
+        {
+            assertSnappedDistance(50, 0);
+            assertSnappedDistance(100, 100);
+            assertSnappedDistance(150, 100);
+            assertSnappedDistance(200, 200);
+            assertSnappedDistance(250, 200);
+
+            AddStep("set slider multiplier = 2", () => composer.EditorBeatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = 2);
+
+            assertSnappedDistance(50, 0);
+            assertSnappedDistance(100, 0);
+            assertSnappedDistance(150, 0);
+            assertSnappedDistance(200, 200);
+            assertSnappedDistance(250, 200);
+
+            AddStep("set beat length = 500", () =>
+            {
+                composer.EditorBeatmap.ControlPointInfo.Clear();
+                composer.EditorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = 500 });
+            });
+
+            assertSnappedDistance(50, 0);
+            assertSnappedDistance(100, 0);
+            assertSnappedDistance(150, 0);
+            assertSnappedDistance(200, 200);
+            assertSnappedDistance(250, 200);
+            assertSnappedDistance(400, 400);
+        }
+
+        private void assertSnapDistance(float expectedDistance)
+            => AddAssert($"distance is {expectedDistance}", () => composer.GetBeatSnapDistanceAt(0) == expectedDistance);
+
+        private void assertDurationToDistance(double duration, float expectedDistance)
+            => AddAssert($"duration = {duration} -> distance = {expectedDistance}", () => composer.DurationToDistance(0, duration) == expectedDistance);
+
+        private void assertDistanceToDuration(float distance, double expectedDuration)
+            => AddAssert($"distance = {distance} -> duration = {expectedDuration}", () => composer.DistanceToDuration(0, distance) == expectedDuration);
+
+        private void assertSnappedDuration(float distance, double expectedDuration)
+            => AddAssert($"distance = {distance} -> duration = {expectedDuration} (snapped)", () => composer.GetSnappedDurationFromDistance(0, distance) == expectedDuration);
+
+        private void assertSnappedDistance(float distance, float expectedDistance)
+            => AddAssert($"distance = {distance} -> distance = {expectedDistance} (snapped)", () => composer.GetSnappedDistanceFromDistance(0, distance) == expectedDistance);
+
+        private class TestHitObjectComposer : OsuHitObjectComposer
+        {
+            public new EditorBeatmap<OsuHitObject> EditorBeatmap => base.EditorBeatmap;
+
+            public TestHitObjectComposer()
+                : base(new OsuRuleset())
+            {
+            }
+        }
+    }
+}

osu.Game.Tests/NonVisual/ControlPointInfoTest.cs

@@ -0,0 +1,227 @@
+// 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.Linq;
+using NUnit.Framework;
+using osu.Game.Beatmaps.ControlPoints;
+
+namespace osu.Game.Tests.NonVisual
+{
+    [TestFixture]
+    public class ControlPointInfoTest
+    {
+        [Test]
+        public void TestAdd()
+        {
+            var cpi = new ControlPointInfo();
+
+            cpi.Add(0, new TimingControlPoint());
+            cpi.Add(1000, new TimingControlPoint { BeatLength = 500 });
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(2));
+            Assert.That(cpi.TimingPoints.Count, Is.EqualTo(2));
+            Assert.That(cpi.AllControlPoints.Count(), Is.EqualTo(2));
+        }
+
+        [Test]
+        public void TestAddRedundantTiming()
+        {
+            var cpi = new ControlPointInfo();
+
+            cpi.Add(0, new TimingControlPoint()); // is *not* redundant, special exception for first timing point.
+            cpi.Add(1000, new TimingControlPoint()); // is redundant
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(1));
+            Assert.That(cpi.TimingPoints.Count, Is.EqualTo(1));
+            Assert.That(cpi.AllControlPoints.Count(), Is.EqualTo(1));
+        }
+
+        [Test]
+        public void TestAddRedundantDifficulty()
+        {
+            var cpi = new ControlPointInfo();
+
+            cpi.Add(0, new DifficultyControlPoint()); // is redundant
+            cpi.Add(1000, new DifficultyControlPoint()); // is redundant
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(0));
+            Assert.That(cpi.TimingPoints.Count, Is.EqualTo(0));
+            Assert.That(cpi.AllControlPoints.Count(), Is.EqualTo(0));
+
+            cpi.Add(1000, new DifficultyControlPoint { SpeedMultiplier = 2 }); // is not redundant
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(1));
+            Assert.That(cpi.DifficultyPoints.Count, Is.EqualTo(1));
+            Assert.That(cpi.AllControlPoints.Count(), Is.EqualTo(1));
+        }
+
+        [Test]
+        public void TestAddRedundantSample()
+        {
+            var cpi = new ControlPointInfo();
+
+            cpi.Add(0, new SampleControlPoint()); // is redundant
+            cpi.Add(1000, new SampleControlPoint()); // is redundant
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(0));
+            Assert.That(cpi.TimingPoints.Count, Is.EqualTo(0));
+            Assert.That(cpi.AllControlPoints.Count(), Is.EqualTo(0));
+
+            cpi.Add(1000, new SampleControlPoint { SampleVolume = 50 }); // is not redundant
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(1));
+            Assert.That(cpi.SamplePoints.Count, Is.EqualTo(1));
+            Assert.That(cpi.AllControlPoints.Count(), Is.EqualTo(1));
+        }
+
+        [Test]
+        public void TestAddRedundantEffect()
+        {
+            var cpi = new ControlPointInfo();
+
+            cpi.Add(0, new EffectControlPoint()); // is redundant
+            cpi.Add(1000, new EffectControlPoint()); // is redundant
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(0));
+            Assert.That(cpi.TimingPoints.Count, Is.EqualTo(0));
+            Assert.That(cpi.AllControlPoints.Count(), Is.EqualTo(0));
+
+            cpi.Add(1000, new EffectControlPoint { KiaiMode = true }); // is not redundant
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(1));
+            Assert.That(cpi.EffectPoints.Count, Is.EqualTo(1));
+            Assert.That(cpi.AllControlPoints.Count(), Is.EqualTo(1));
+        }
+
+        [Test]
+        public void TestAddGroup()
+        {
+            var cpi = new ControlPointInfo();
+
+            var group = cpi.GroupAt(1000, true);
+            var group2 = cpi.GroupAt(1000, true);
+
+            Assert.That(group, Is.EqualTo(group2));
+            Assert.That(cpi.Groups.Count, Is.EqualTo(1));
+        }
+
+        [Test]
+        public void TestGroupAtLookupOnly()
+        {
+            var cpi = new ControlPointInfo();
+
+            var group = cpi.GroupAt(5000, true);
+            Assert.That(group, Is.Not.Null);
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(1));
+            Assert.That(cpi.GroupAt(1000), Is.Null);
+            Assert.That(cpi.GroupAt(5000), Is.Not.Null);
+        }
+
+        [Test]
+        public void TestAddRemoveGroup()
+        {
+            var cpi = new ControlPointInfo();
+
+            var group = cpi.GroupAt(1000, true);
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(1));
+
+            cpi.RemoveGroup(group);
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(0));
+        }
+
+        [Test]
+        public void TestAddControlPointToGroup()
+        {
+            var cpi = new ControlPointInfo();
+
+            var group = cpi.GroupAt(1000, true);
+            Assert.That(cpi.Groups.Count, Is.EqualTo(1));
+
+            // usually redundant, but adding to group forces it to be added
+            group.Add(new DifficultyControlPoint());
+
+            Assert.That(group.ControlPoints.Count, Is.EqualTo(1));
+            Assert.That(cpi.DifficultyPoints.Count, Is.EqualTo(1));
+        }
+
+        [Test]
+        public void TestAddDuplicateControlPointToGroup()
+        {
+            var cpi = new ControlPointInfo();
+
+            var group = cpi.GroupAt(1000, true);
+            Assert.That(cpi.Groups.Count, Is.EqualTo(1));
+
+            group.Add(new DifficultyControlPoint());
+            group.Add(new DifficultyControlPoint { SpeedMultiplier = 2 });
+
+            Assert.That(group.ControlPoints.Count, Is.EqualTo(1));
+            Assert.That(cpi.DifficultyPoints.Count, Is.EqualTo(1));
+            Assert.That(cpi.DifficultyPoints.First().SpeedMultiplier, Is.EqualTo(2));
+        }
+
+        [Test]
+        public void TestRemoveControlPointFromGroup()
+        {
+            var cpi = new ControlPointInfo();
+
+            var group = cpi.GroupAt(1000, true);
+            Assert.That(cpi.Groups.Count, Is.EqualTo(1));
+
+            var difficultyPoint = new DifficultyControlPoint();
+
+            group.Add(difficultyPoint);
+            group.Remove(difficultyPoint);
+
+            Assert.That(group.ControlPoints.Count, Is.EqualTo(0));
+            Assert.That(cpi.DifficultyPoints.Count, Is.EqualTo(0));
+            Assert.That(cpi.AllControlPoints.Count, Is.EqualTo(0));
+        }
+
+        [Test]
+        public void TestOrdering()
+        {
+            var cpi = new ControlPointInfo();
+
+            cpi.Add(0, new TimingControlPoint());
+            cpi.Add(1000, new TimingControlPoint { BeatLength = 500 });
+            cpi.Add(10000, new TimingControlPoint { BeatLength = 200 });
+            cpi.Add(5000, new TimingControlPoint { BeatLength = 100 });
+            cpi.Add(3000, new DifficultyControlPoint { SpeedMultiplier = 2 });
+            cpi.GroupAt(7000, true).Add(new DifficultyControlPoint { SpeedMultiplier = 4 });
+            cpi.GroupAt(1000).Add(new SampleControlPoint { SampleVolume = 0 });
+            cpi.GroupAt(8000, true).Add(new EffectControlPoint { KiaiMode = true });
+
+            Assert.That(cpi.AllControlPoints.Count, Is.EqualTo(8));
+
+            Assert.That(cpi.Groups, Is.Ordered.Ascending.By(nameof(ControlPointGroup.Time)));
+
+            Assert.That(cpi.AllControlPoints, Is.Ordered.Ascending.By(nameof(ControlPoint.Time)));
+            Assert.That(cpi.TimingPoints, Is.Ordered.Ascending.By(nameof(ControlPoint.Time)));
+        }
+
+        [Test]
+        public void TestClear()
+        {
+            var cpi = new ControlPointInfo();
+
+            cpi.Add(0, new TimingControlPoint());
+            cpi.Add(1000, new TimingControlPoint { BeatLength = 500 });
+            cpi.Add(10000, new TimingControlPoint { BeatLength = 200 });
+            cpi.Add(5000, new TimingControlPoint { BeatLength = 100 });
+            cpi.Add(3000, new DifficultyControlPoint { SpeedMultiplier = 2 });
+            cpi.GroupAt(7000, true).Add(new DifficultyControlPoint { SpeedMultiplier = 4 });
+            cpi.GroupAt(1000).Add(new SampleControlPoint { SampleVolume = 0 });
+            cpi.GroupAt(8000, true).Add(new EffectControlPoint { KiaiMode = true });
+
+            cpi.Clear();
+
+            Assert.That(cpi.Groups.Count, Is.EqualTo(0));
+            Assert.That(cpi.DifficultyPoints.Count, Is.EqualTo(0));
+            Assert.That(cpi.AllControlPoints.Count, Is.EqualTo(0));
+        }
+    }
+}

osu.Game.Tests/Resources/controlpoint-difficulty-multiplier.osu

@@ -0,0 +1,8 @@
+osu file format v7
+
+[TimingPoints]
+0,100,4,2,0,100,1,0
+12,500,4,2,0,100,1,0
+1000,-10,4,2,0,100,0,0
+2000,-54,4,2,0,100,0,0
+3000,-200,4,2,0,100,0,0

osu.Game.Tests/Resources/timingpoint-speedmultiplier-reset.osu

@@ -0,0 +1,5 @@
+osu file format v14
+
+[TimingPoints]
+0,-200,4,1,0,100,0,0
+2000,100,1,1,0,100,1,0

osu.Game.Tests/Visual/Editor/TestSceneDistanceSnapGrid.cs

@@ -1,14 +1,12 @@
 // 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 NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Shapes;
-using osu.Framework.MathUtils;
-using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Osu.Beatmaps;
 using osu.Game.Rulesets.Osu.Objects;
@@ -27,27 +25,25 @@ namespace osu.Game.Tests.Visual.Editor
         [Cached(typeof(IEditorBeatmap))]
         private readonly EditorBeatmap<OsuHitObject> editorBeatmap;
 
-        private TestDistanceSnapGrid grid;
+        [Cached(typeof(IDistanceSnapProvider))]
+        private readonly SnapProvider snapProvider = new SnapProvider();
 
         public TestSceneDistanceSnapGrid()
         {
             editorBeatmap = new EditorBeatmap<OsuHitObject>(new OsuBeatmap());
-            editorBeatmap.ControlPointInfo.TimingPoints.Add(new TimingControlPoint { BeatLength = beat_length });
+            editorBeatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = beat_length });
 
-            createGrid();
+            Children = new Drawable[]
+            {
+                new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Colour = Color4.SlateGray
+                },
+                new TestDistanceSnapGrid(new HitObject(), grid_position)
+            };
         }
 
-        [SetUp]
-        public void Setup() => Schedule(() =>
-        {
-            Clear();
-
-            editorBeatmap.ControlPointInfo.TimingPoints.Clear();
-            editorBeatmap.ControlPointInfo.TimingPoints.Add(new TimingControlPoint { BeatLength = beat_length });
-
-            BeatDivisor.Value = 1;
-        });
-
         [TestCase(1)]
         [TestCase(2)]
         [TestCase(3)]
@@ -56,84 +52,13 @@ namespace osu.Game.Tests.Visual.Editor
         [TestCase(8)]
         [TestCase(12)]
         [TestCase(16)]
-        public void TestInitialBeatDivisor(int divisor)
+        public void TestBeatDivisor(int divisor)
         {
             AddStep($"set beat divisor = {divisor}", () => BeatDivisor.Value = divisor);
-            createGrid();
-
-            float expectedDistance = (float)beat_length / divisor;
-            AddAssert($"spacing is {expectedDistance}", () => Precision.AlmostEquals(grid.DistanceSpacing, expectedDistance));
-        }
-
-        [Test]
-        public void TestChangeBeatDivisor()
-        {
-            createGrid();
-            AddStep("set beat divisor = 2", () => BeatDivisor.Value = 2);
-
-            const float expected_distance = (float)beat_length / 2;
-            AddAssert($"spacing is {expected_distance}", () => Precision.AlmostEquals(grid.DistanceSpacing, expected_distance));
-        }
-
-        [TestCase(100)]
-        [TestCase(200)]
-        public void TestBeatLength(double beatLength)
-        {
-            AddStep($"set beat length = {beatLength}", () =>
-            {
-                editorBeatmap.ControlPointInfo.TimingPoints.Clear();
-                editorBeatmap.ControlPointInfo.TimingPoints.Add(new TimingControlPoint { BeatLength = beatLength });
-            });
-
-            createGrid();
-            AddAssert($"spacing is {beatLength}", () => Precision.AlmostEquals(grid.DistanceSpacing, beatLength));
-        }
-
-        [TestCase(1)]
-        [TestCase(2)]
-        public void TestGridVelocity(float velocity)
-        {
-            createGrid(g => g.Velocity = velocity);
-
-            float expectedDistance = (float)beat_length * velocity;
-            AddAssert($"spacing is {expectedDistance}", () => Precision.AlmostEquals(grid.DistanceSpacing, expectedDistance));
-        }
-
-        [Test]
-        public void TestGetSnappedTime()
-        {
-            createGrid();
-
-            Vector2 snapPosition = Vector2.Zero;
-            AddStep("get first tick position", () => snapPosition = grid_position + new Vector2((float)beat_length, 0));
-            AddAssert("snap time is 1 beat away", () => Precision.AlmostEquals(beat_length, grid.GetSnapTime(snapPosition), 0.01));
-
-            createGrid(g => g.Velocity = 2, "with velocity = 2");
-            AddAssert("snap time is now 0.5 beats away", () => Precision.AlmostEquals(beat_length / 2, grid.GetSnapTime(snapPosition), 0.01));
-        }
-
-        private void createGrid(Action<TestDistanceSnapGrid> func = null, string description = null)
-        {
-            AddStep($"create grid {description ?? string.Empty}", () =>
-            {
-                Children = new Drawable[]
-                {
-                    new Box
-                    {
-                        RelativeSizeAxes = Axes.Both,
-                        Colour = Color4.SlateGray
-                    },
-                    grid = new TestDistanceSnapGrid(new HitObject(), grid_position)
-                };
-
-                func?.Invoke(grid);
-            });
         }
 
         private class TestDistanceSnapGrid : DistanceSnapGrid
         {
-            public new float Velocity = 1;
-
             public new float DistanceSpacing => base.DistanceSpacing;
 
             public TestDistanceSnapGrid(HitObject hitObject, Vector2 centrePosition)
@@ -203,11 +128,23 @@ namespace osu.Game.Tests.Visual.Editor
                 }
             }
 
-            protected override float GetVelocity(double time, ControlPointInfo controlPointInfo, BeatmapDifficulty difficulty)
-                => Velocity;
+            public override (Vector2 position, double time) GetSnappedPosition(Vector2 screenSpacePosition)
+                => (Vector2.Zero, 0);
+        }
 
-            public override Vector2 GetSnapPosition(Vector2 screenSpacePosition)
-                => Vector2.Zero;
+        private class SnapProvider : IDistanceSnapProvider
+        {
+            public (Vector2 position, double time) GetSnappedPosition(Vector2 position, double time) => (position, time);
+
+            public float GetBeatSnapDistanceAt(double referenceTime) => 10;
+
+            public float DurationToDistance(double referenceTime, double duration) => 0;
+
+            public double DistanceToDuration(double referenceTime, float distance) => 0;
+
+            public double GetSnappedDurationFromDistance(double referenceTime, float distance) => 0;
+
+            public float GetSnappedDistanceFromDistance(double referenceTime, float distance) => 0;
         }
     }
 }

osu.Game.Tests/Visual/Editor/TestSceneEditorSeekSnapping.cs

@@ -28,18 +28,7 @@ namespace osu.Game.Tests.Visual.Editor
         {
             var testBeatmap = new Beatmap
             {
-                ControlPointInfo = new ControlPointInfo
-                {
-                    TimingPoints =
-                    {
-                        new TimingControlPoint { Time = 0, BeatLength = 200 },
-                        new TimingControlPoint { Time = 100, BeatLength = 400 },
-                        new TimingControlPoint { Time = 175, BeatLength = 800 },
-                        new TimingControlPoint { Time = 350, BeatLength = 200 },
-                        new TimingControlPoint { Time = 450, BeatLength = 100 },
-                        new TimingControlPoint { Time = 500, BeatLength = 307.69230769230802 }
-                    }
-                },
+                ControlPointInfo = new ControlPointInfo(),
                 HitObjects =
                 {
                     new HitCircle { StartTime = 0 },
@@ -47,6 +36,13 @@ namespace osu.Game.Tests.Visual.Editor
                 }
             };
 
+            testBeatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = 200 });
+            testBeatmap.ControlPointInfo.Add(100, new TimingControlPoint { BeatLength = 400 });
+            testBeatmap.ControlPointInfo.Add(175, new TimingControlPoint { BeatLength = 800 });
+            testBeatmap.ControlPointInfo.Add(350, new TimingControlPoint { BeatLength = 200 });
+            testBeatmap.ControlPointInfo.Add(450, new TimingControlPoint { BeatLength = 100 });
+            testBeatmap.ControlPointInfo.Add(500, new TimingControlPoint { BeatLength = 307.69230769230802 });
+
             Beatmap.Value = CreateWorkingBeatmap(testBeatmap);
 
             Child = new TimingPointVisualiser(testBeatmap, 5000) { Clock = Clock };

osu.Game.Tests/Visual/Editor/TestSceneHitObjectComposer.cs

@@ -22,7 +22,7 @@ using osuTK;
 namespace osu.Game.Tests.Visual.Editor
 {
     [TestFixture]
-    public class TestSceneHitObjectComposer : OsuTestScene
+    public class TestSceneHitObjectComposer : EditorClockTestScene
     {
         public override IReadOnlyList<Type> RequiredTypes => new[]
         {

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

@@ -47,7 +47,8 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Test]
         public void TestRelativeBeatLengthScaleSingleTimingPoint()
         {
-            var beatmap = createBeatmap(new TimingControlPoint { BeatLength = time_range / 2 });
+            var beatmap = createBeatmap();
+            beatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = time_range / 2 });
 
             createTest(beatmap, d => d.RelativeScaleBeatLengthsOverride = true);
 
@@ -61,10 +62,10 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Test]
         public void TestRelativeBeatLengthScaleTimingPointBeyondEndDoesNotBecomeDominant()
         {
-            var beatmap = createBeatmap(
-                new TimingControlPoint { BeatLength = time_range / 2 },
-                new TimingControlPoint { Time = 12000, BeatLength = time_range },
-                new TimingControlPoint { Time = 100000, BeatLength = time_range });
+            var beatmap = createBeatmap();
+            beatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = time_range / 2 });
+            beatmap.ControlPointInfo.Add(12000, new TimingControlPoint { BeatLength = time_range });
+            beatmap.ControlPointInfo.Add(100000, new TimingControlPoint { BeatLength = time_range });
 
             createTest(beatmap, d => d.RelativeScaleBeatLengthsOverride = true);
 
@@ -75,9 +76,9 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Test]
         public void TestRelativeBeatLengthScaleFromSecondTimingPoint()
         {
-            var beatmap = createBeatmap(
-                new TimingControlPoint { BeatLength = time_range },
-                new TimingControlPoint { Time = 3 * time_range, BeatLength = time_range / 2 });
+            var beatmap = createBeatmap();
+            beatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = time_range });
+            beatmap.ControlPointInfo.Add(3 * time_range, new TimingControlPoint { BeatLength = time_range / 2 });
 
             createTest(beatmap, d => d.RelativeScaleBeatLengthsOverride = true);
 
@@ -97,9 +98,9 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Test]
         public void TestNonRelativeScale()
         {
-            var beatmap = createBeatmap(
-                new TimingControlPoint { BeatLength = time_range },
-                new TimingControlPoint { Time = 3 * time_range, BeatLength = time_range / 2 });
+            var beatmap = createBeatmap();
+            beatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = time_range });
+            beatmap.ControlPointInfo.Add(3 * time_range, new TimingControlPoint { BeatLength = time_range / 2 });
 
             createTest(beatmap);
 
@@ -119,7 +120,8 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Test]
         public void TestSliderMultiplierDoesNotAffectRelativeBeatLength()
         {
-            var beatmap = createBeatmap(new TimingControlPoint { BeatLength = time_range });
+            var beatmap = createBeatmap();
+            beatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = time_range });
             beatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = 2;
 
             createTest(beatmap, d => d.RelativeScaleBeatLengthsOverride = true);
@@ -132,7 +134,8 @@ namespace osu.Game.Tests.Visual.Gameplay
         [Test]
         public void TestSliderMultiplierAffectsNonRelativeBeatLength()
         {
-            var beatmap = createBeatmap(new TimingControlPoint { BeatLength = time_range });
+            var beatmap = createBeatmap();
+            beatmap.ControlPointInfo.Add(0, new TimingControlPoint { BeatLength = time_range });
             beatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier = 2;
 
             createTest(beatmap);
@@ -154,14 +157,11 @@ namespace osu.Game.Tests.Visual.Gameplay
         /// Creates an <see cref="IBeatmap"/>, containing 10 hitobjects and user-provided timing points.
         /// The hitobjects are spaced <see cref="time_range"/> milliseconds apart.
         /// </summary>
-        /// <param name="timingControlPoints">The timing points to add to the beatmap.</param>
         /// <returns>The <see cref="IBeatmap"/>.</returns>
-        private IBeatmap createBeatmap(params TimingControlPoint[] timingControlPoints)
+        private IBeatmap createBeatmap()
         {
             var beatmap = new Beatmap<HitObject> { BeatmapInfo = { Ruleset = new OsuRuleset().RulesetInfo } };
 
-            beatmap.ControlPointInfo.TimingPoints.AddRange(timingControlPoints);
-
             for (int i = 0; i < 10; i++)
                 beatmap.HitObjects.Add(new HitObject { StartTime = i * time_range });
 

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

@@ -3,6 +3,7 @@
 
 using NUnit.Framework;
 using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Screens.Play.HUD;
 using osu.Game.Screens.Play.PlayerSettings;
@@ -20,6 +21,7 @@ namespace osu.Game.Tests.Visual.Gameplay
             {
                 Anchor = Anchor.TopRight,
                 Origin = Anchor.TopRight,
+                State = { Value = Visibility.Visible }
             });
 
             Add(container = new ExampleContainer());

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

@@ -33,23 +33,15 @@ namespace osu.Game.Tests.Visual.Menus
         [Test]
         public void TestInstantLoad()
         {
-            bool logoVisible = false;
+            // visual only, very impossible to test this using asserts.
 
-            AddStep("begin loading", () =>
+            AddStep("load immediately", () =>
             {
                 loader = new TestLoader();
                 loader.AllowLoad.Set();
 
                 LoadScreen(loader);
             });
-
-            AddUntilStep("loaded", () =>
-            {
-                logoVisible = loader.Logo?.Alpha > 0;
-                return loader.Logo != null && loader.ScreenLoaded;
-            });
-
-            AddAssert("logo was not visible", () => !logoVisible);
         }
 
         [Test]
@@ -58,7 +50,7 @@ namespace osu.Game.Tests.Visual.Menus
             AddStep("begin loading", () => LoadScreen(loader = new TestLoader()));
             AddUntilStep("wait for logo visible", () => loader.Logo?.Alpha > 0);
             AddStep("finish loading", () => loader.AllowLoad.Set());
-            AddAssert("loaded", () => loader.Logo != null && loader.ScreenLoaded);
+            AddUntilStep("loaded", () => loader.Logo != null && loader.ScreenLoaded);
             AddUntilStep("logo gone", () => loader.Logo?.Alpha == 0);
         }
 

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

@@ -22,7 +22,8 @@ namespace osu.Game.Tests.Visual.Online
             typeof(HeaderButton),
             typeof(SortTabControl),
             typeof(ShowChildrenButton),
-            typeof(DeletedChildrenPlaceholder)
+            typeof(DeletedChildrenPlaceholder),
+            typeof(VotePill)
         };
 
         protected override bool UseOnlineAPI => true;

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

@@ -6,6 +6,11 @@ using osu.Framework.Graphics;
 using osu.Game.Online.Chat;
 using osu.Game.Users;
 using osuTK;
+using System;
+using System.Linq;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Graphics.Containers;
+using osu.Game.Overlays.Chat;
 
 namespace osu.Game.Tests.Visual.Online
 {
@@ -41,14 +46,14 @@ namespace osu.Game.Tests.Visual.Online
         [Cached]
         private ChannelManager channelManager = new ChannelManager();
 
-        private readonly StandAloneChatDisplay chatDisplay;
-        private readonly StandAloneChatDisplay chatDisplay2;
+        private readonly TestStandAloneChatDisplay chatDisplay;
+        private readonly TestStandAloneChatDisplay chatDisplay2;
 
         public TestSceneStandAloneChatDisplay()
         {
             Add(channelManager);
 
-            Add(chatDisplay = new StandAloneChatDisplay
+            Add(chatDisplay = new TestStandAloneChatDisplay
             {
                 Anchor = Anchor.CentreLeft,
                 Origin = Anchor.CentreLeft,
@@ -56,7 +61,7 @@ namespace osu.Game.Tests.Visual.Online
                 Size = new Vector2(400, 80)
             });
 
-            Add(chatDisplay2 = new StandAloneChatDisplay(true)
+            Add(chatDisplay2 = new TestStandAloneChatDisplay(true)
             {
                 Anchor = Anchor.CentreRight,
                 Origin = Anchor.CentreRight,
@@ -111,6 +116,56 @@ namespace osu.Game.Tests.Visual.Online
                 Sender = longUsernameUser,
                 Content = "Hi guys, my new username is lit!"
             }));
+
+            AddStep("message with new date", () => testChannel.AddNewMessages(new Message(sequence++)
+            {
+                Sender = longUsernameUser,
+                Content = "Message from the future!",
+                Timestamp = DateTimeOffset.Now
+            }));
+
+            AddUntilStep("ensure still scrolled to bottom", () => chatDisplay.ScrolledToBottom);
+
+            const int messages_per_call = 10;
+            AddRepeatStep("add many messages", () =>
+                {
+                    for (int i = 0; i < messages_per_call; i++)
+                        testChannel.AddNewMessages(new Message(sequence++)
+                        {
+                            Sender = longUsernameUser,
+                            Content = "Many messages! " + Guid.NewGuid(),
+                            Timestamp = DateTimeOffset.Now
+                        });
+                }, Channel.MAX_HISTORY / messages_per_call + 5);
+
+            AddAssert("Ensure no adjacent day separators", () =>
+            {
+                var indices = chatDisplay.FillFlow.OfType<DrawableChannel.DaySeparator>().Select(ds => chatDisplay.FillFlow.IndexOf(ds));
+
+                foreach (var i in indices)
+                    if (i < chatDisplay.FillFlow.Count && chatDisplay.FillFlow[i + 1] is DrawableChannel.DaySeparator)
+                        return false;
+
+                return true;
+            });
+
+            AddUntilStep("ensure still scrolled to bottom", () => chatDisplay.ScrolledToBottom);
+        }
+
+        private class TestStandAloneChatDisplay : StandAloneChatDisplay
+        {
+            public TestStandAloneChatDisplay(bool textbox = false)
+                : base(textbox)
+            {
+            }
+
+            protected DrawableChannel DrawableChannel => InternalChildren.OfType<DrawableChannel>().First();
+
+            protected OsuScrollContainer ScrollContainer => (OsuScrollContainer)((Container)DrawableChannel.Child).Child;
+
+            public FillFlowContainer FillFlow => (FillFlowContainer)ScrollContainer.Child;
+
+            public bool ScrolledToBottom => ScrollContainer.IsScrolledToEnd(1);
         }
     }
 }

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

@@ -245,6 +245,28 @@ namespace osu.Game.Tests.Visual.SongSelect
             AddAssert($"Check #{set_count} is at bottom", () => carousel.BeatmapSets.Last().Metadata.Title.EndsWith($"#{set_count}!"));
         }
 
+        [Test]
+        public void TestSortingStability()
+        {
+            var sets = new List<BeatmapSetInfo>();
+
+            for (int i = 0; i < 20; i++)
+            {
+                var set = createTestBeatmapSet(i);
+                set.Metadata.Artist = "same artist";
+                set.Metadata.Title = "same title";
+                sets.Add(set);
+            }
+
+            loadBeatmaps(sets);
+
+            AddStep("Sort by artist", () => carousel.Filter(new FilterCriteria { Sort = SortMode.Artist }, false));
+            AddAssert("Items remain in original order", () => carousel.BeatmapSets.Select((set, index) => set.ID == index).All(b => b));
+
+            AddStep("Sort by title", () => carousel.Filter(new FilterCriteria { Sort = SortMode.Title }, false));
+            AddAssert("Items remain in original order", () => carousel.BeatmapSets.Select((set, index) => set.ID == index).All(b => b));
+        }
+
         [Test]
         public void TestSortingWithFiltered()
         {

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

@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Audio.Track;
@@ -10,7 +11,6 @@ using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
-using osu.Framework.Lists;
 using osu.Framework.Timing;
 using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Graphics;
@@ -153,7 +153,7 @@ namespace osu.Game.Tests.Visual.UserInterface
                 };
             }
 
-            private SortedList<TimingControlPoint> timingPoints => Beatmap.Value.Beatmap.ControlPointInfo.TimingPoints;
+            private List<TimingControlPoint> timingPoints => Beatmap.Value.Beatmap.ControlPointInfo.TimingPoints.ToList();
 
             private TimingControlPoint getNextTimingPoint(TimingControlPoint current)
             {

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

@@ -11,7 +11,7 @@ using osuTK.Graphics;
 
 namespace osu.Game.Tests.Visual.UserInterface
 {
-    public class TestSceneLabelledComponent : OsuTestScene
+    public class TestSceneLabelledDrawable : OsuTestScene
     {
         [TestCase(false)]
         [TestCase(true)]
@@ -25,7 +25,7 @@ namespace osu.Game.Tests.Visual.UserInterface
         {
             AddStep("create component", () =>
             {
-                LabelledComponent<Drawable> component;
+                LabelledDrawable<Drawable> component;
 
                 Child = new Container
                 {
@@ -33,7 +33,7 @@ namespace osu.Game.Tests.Visual.UserInterface
                     Origin = Anchor.Centre,
                     Width = 500,
                     AutoSizeAxes = Axes.Y,
-                    Child = component = padded ? (LabelledComponent<Drawable>)new PaddedLabelledComponent() : new NonPaddedLabelledComponent(),
+                    Child = component = padded ? (LabelledDrawable<Drawable>)new PaddedLabelledDrawable() : new NonPaddedLabelledDrawable(),
                 };
 
                 component.Label = "a sample component";
@@ -41,9 +41,9 @@ namespace osu.Game.Tests.Visual.UserInterface
             });
         }
 
-        private class PaddedLabelledComponent : LabelledComponent<Drawable>
+        private class PaddedLabelledDrawable : LabelledDrawable<Drawable>
         {
-            public PaddedLabelledComponent()
+            public PaddedLabelledDrawable()
                 : base(true)
             {
             }
@@ -57,9 +57,9 @@ namespace osu.Game.Tests.Visual.UserInterface
             };
         }
 
-        private class NonPaddedLabelledComponent : LabelledComponent<Drawable>
+        private class NonPaddedLabelledDrawable : LabelledDrawable<Drawable>
         {
-            public NonPaddedLabelledComponent()
+            public NonPaddedLabelledDrawable()
                 : base(false)
             {
             }

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

@@ -7,7 +7,6 @@ using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
-using osu.Game.Graphics.UserInterface;
 using osu.Game.Graphics.UserInterfaceV2;
 
 namespace osu.Game.Tests.Visual.UserInterface
@@ -28,7 +27,7 @@ namespace osu.Game.Tests.Visual.UserInterface
         {
             AddStep("create component", () =>
             {
-                LabelledComponent<OsuTextBox> component;
+                LabelledTextBox component;
 
                 Child = new Container
                 {

osu.Game.Tournament/Screens/SetupScreen.cs

@@ -89,7 +89,7 @@ namespace osu.Game.Tournament.Screens
             };
         }
 
-        private class ActionableInfo : LabelledComponent<Drawable>
+        private class ActionableInfo : LabelledDrawable<Drawable>
         {
             private OsuButton button;
 

osu.Game/Beatmaps/ControlPoints/ControlPoint.cs

@@ -1,25 +1,30 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// 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;
 
 namespace osu.Game.Beatmaps.ControlPoints
 {
-    public class ControlPoint : IComparable<ControlPoint>, IEquatable<ControlPoint>
+    public abstract class ControlPoint : IComparable<ControlPoint>, IEquatable<ControlPoint>
     {
         /// <summary>
         /// The time at which the control point takes effect.
         /// </summary>
-        public double Time;
+        public double Time => controlPointGroup?.Time ?? 0;
 
-        /// <summary>
-        /// Whether this timing point was generated internally, as opposed to parsed from the underlying beatmap.
-        /// </summary>
-        internal bool AutoGenerated;
+        private ControlPointGroup controlPointGroup;
+
+        public void AttachGroup(ControlPointGroup pointGroup) => this.controlPointGroup = pointGroup;
 
         public int CompareTo(ControlPoint other) => Time.CompareTo(other.Time);
 
-        public bool Equals(ControlPoint other)
-            => Time.Equals(other?.Time);
+        /// <summary>
+        /// Whether this control point is equivalent to another, ignoring time.
+        /// </summary>
+        /// <param name="other">Another control point to compare with.</param>
+        /// <returns>Whether equivalent.</returns>
+        public abstract bool EquivalentTo(ControlPoint other);
+
+        public bool Equals(ControlPoint other) => Time.Equals(other?.Time) && EquivalentTo(other);
     }
 }

osu.Game/Beatmaps/ControlPoints/ControlPointGroup.cs

@@ -0,0 +1,50 @@
+// 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 osu.Framework.Bindables;
+
+namespace osu.Game.Beatmaps.ControlPoints
+{
+    public class ControlPointGroup : IComparable<ControlPointGroup>
+    {
+        public event Action<ControlPoint> ItemAdded;
+        public event Action<ControlPoint> ItemRemoved;
+
+        /// <summary>
+        /// The time at which the control point takes effect.
+        /// </summary>
+        public double Time { get; }
+
+        public IBindableList<ControlPoint> ControlPoints => controlPoints;
+
+        private readonly BindableList<ControlPoint> controlPoints = new BindableList<ControlPoint>();
+
+        public ControlPointGroup(double time)
+        {
+            Time = time;
+        }
+
+        public int CompareTo(ControlPointGroup other) => Time.CompareTo(other.Time);
+
+        public void Add(ControlPoint point)
+        {
+            var existing = controlPoints.FirstOrDefault(p => p.GetType() == point.GetType());
+
+            if (existing != null)
+                Remove(existing);
+
+            point.AttachGroup(this);
+
+            controlPoints.Add(point);
+            ItemAdded?.Invoke(point);
+        }
+
+        public void Remove(ControlPoint point)
+        {
+            controlPoints.Remove(point);
+            ItemRemoved?.Invoke(point);
+        }
+    }
+}

osu.Game/Beatmaps/ControlPoints/ControlPointInfo.cs

@@ -5,6 +5,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using Newtonsoft.Json;
+using osu.Framework.Bindables;
 using osu.Framework.Lists;
 
 namespace osu.Game.Beatmaps.ControlPoints
@@ -12,57 +13,78 @@ namespace osu.Game.Beatmaps.ControlPoints
     [Serializable]
     public class ControlPointInfo
     {
+        /// <summary>
+        /// All control points grouped by time.
+        /// </summary>
+        [JsonProperty]
+        public IBindableList<ControlPointGroup> Groups => groups;
+
+        private readonly BindableList<ControlPointGroup> groups = new BindableList<ControlPointGroup>();
+
         /// <summary>
         /// All timing points.
         /// </summary>
         [JsonProperty]
-        public SortedList<TimingControlPoint> TimingPoints { get; private set; } = new SortedList<TimingControlPoint>(Comparer<TimingControlPoint>.Default);
+        public IReadOnlyList<TimingControlPoint> TimingPoints => timingPoints;
+
+        private readonly SortedList<TimingControlPoint> timingPoints = new SortedList<TimingControlPoint>(Comparer<TimingControlPoint>.Default);
 
         /// <summary>
         /// All difficulty points.
         /// </summary>
         [JsonProperty]
-        public SortedList<DifficultyControlPoint> DifficultyPoints { get; private set; } = new SortedList<DifficultyControlPoint>(Comparer<DifficultyControlPoint>.Default);
+        public IReadOnlyList<DifficultyControlPoint> DifficultyPoints => difficultyPoints;
+
+        private readonly SortedList<DifficultyControlPoint> difficultyPoints = new SortedList<DifficultyControlPoint>(Comparer<DifficultyControlPoint>.Default);
 
         /// <summary>
         /// All sound points.
         /// </summary>
         [JsonProperty]
-        public SortedList<SampleControlPoint> SamplePoints { get; private set; } = new SortedList<SampleControlPoint>(Comparer<SampleControlPoint>.Default);
+        public IReadOnlyList<SampleControlPoint> SamplePoints => samplePoints;
+
+        private readonly SortedList<SampleControlPoint> samplePoints = new SortedList<SampleControlPoint>(Comparer<SampleControlPoint>.Default);
 
         /// <summary>
         /// All effect points.
         /// </summary>
         [JsonProperty]
-        public SortedList<EffectControlPoint> EffectPoints { get; private set; } = new SortedList<EffectControlPoint>(Comparer<EffectControlPoint>.Default);
+        public IReadOnlyList<EffectControlPoint> EffectPoints => effectPoints;
+
+        private readonly SortedList<EffectControlPoint> effectPoints = new SortedList<EffectControlPoint>(Comparer<EffectControlPoint>.Default);
+
+        /// <summary>
+        /// All control points, of all types.
+        /// </summary>
+        public IEnumerable<ControlPoint> AllControlPoints => Groups.SelectMany(g => g.ControlPoints).ToArray();
 
         /// <summary>
         /// Finds the difficulty control point that is active at <paramref name="time"/>.
         /// </summary>
         /// <param name="time">The time to find the difficulty control point at.</param>
         /// <returns>The difficulty control point.</returns>
-        public DifficultyControlPoint DifficultyPointAt(double time) => binarySearch(DifficultyPoints, time);
+        public DifficultyControlPoint DifficultyPointAt(double time) => binarySearchWithFallback(DifficultyPoints, time);
 
         /// <summary>
         /// Finds the effect control point that is active at <paramref name="time"/>.
         /// </summary>
         /// <param name="time">The time to find the effect control point at.</param>
         /// <returns>The effect control point.</returns>
-        public EffectControlPoint EffectPointAt(double time) => binarySearch(EffectPoints, time);
+        public EffectControlPoint EffectPointAt(double time) => binarySearchWithFallback(EffectPoints, time);
 
         /// <summary>
         /// Finds the sound control point that is active at <paramref name="time"/>.
         /// </summary>
         /// <param name="time">The time to find the sound control point at.</param>
         /// <returns>The sound control point.</returns>
-        public SampleControlPoint SamplePointAt(double time) => binarySearch(SamplePoints, time, SamplePoints.Count > 0 ? SamplePoints[0] : null);
+        public SampleControlPoint SamplePointAt(double time) => binarySearchWithFallback(SamplePoints, time, SamplePoints.Count > 0 ? SamplePoints[0] : null);
 
         /// <summary>
         /// Finds the timing control point that is active at <paramref name="time"/>.
         /// </summary>
         /// <param name="time">The time to find the timing control point at.</param>
         /// <returns>The timing control point.</returns>
-        public TimingControlPoint TimingPointAt(double time) => binarySearch(TimingPoints, time, TimingPoints.Count > 0 ? TimingPoints[0] : null);
+        public TimingControlPoint TimingPointAt(double time) => binarySearchWithFallback(TimingPoints, time, TimingPoints.Count > 0 ? TimingPoints[0] : null);
 
         /// <summary>
         /// Finds the maximum BPM represented by any timing control point.
@@ -85,24 +107,93 @@ namespace osu.Game.Beatmaps.ControlPoints
         public double BPMMode =>
             60000 / (TimingPoints.GroupBy(c => c.BeatLength).OrderByDescending(grp => grp.Count()).FirstOrDefault()?.FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
 
+        /// <summary>
+        /// Remove all <see cref="ControlPointGroup"/>s and return to a pristine state.
+        /// </summary>
+        public void Clear()
+        {
+            groups.Clear();
+            timingPoints.Clear();
+            difficultyPoints.Clear();
+            samplePoints.Clear();
+            effectPoints.Clear();
+        }
+
+        /// <summary>
+        /// Add a new <see cref="ControlPoint"/>. Note that the provided control point may not be added if the correct state is already present at the provided time.
+        /// </summary>
+        /// <param name="time">The time at which the control point should be added.</param>
+        /// <param name="controlPoint">The control point to add.</param>
+        /// <returns>Whether the control point was added.</returns>
+        public bool Add(double time, ControlPoint controlPoint)
+        {
+            if (checkAlreadyExisting(time, controlPoint))
+                return false;
+
+            GroupAt(time, true).Add(controlPoint);
+            return true;
+        }
+
+        public ControlPointGroup GroupAt(double time, bool addIfNotExisting = false)
+        {
+            var newGroup = new ControlPointGroup(time);
+
+            int i = groups.BinarySearch(newGroup);
+
+            if (i >= 0)
+                return groups[i];
+
+            if (addIfNotExisting)
+            {
+                newGroup.ItemAdded += groupItemAdded;
+                newGroup.ItemRemoved += groupItemRemoved;
+
+                groups.Insert(~i, newGroup);
+                return newGroup;
+            }
+
+            return null;
+        }
+
+        public void RemoveGroup(ControlPointGroup group)
+        {
+            group.ItemAdded -= groupItemAdded;
+            group.ItemRemoved -= groupItemRemoved;
+
+            groups.Remove(group);
+        }
+
         /// <summary>
         /// Binary searches one of the control point lists to find the active control point at <paramref name="time"/>.
+        /// Includes logic for returning a specific point when no matching point is found.
         /// </summary>
         /// <param name="list">The list to search.</param>
         /// <param name="time">The time to find the control point at.</param>
         /// <param name="prePoint">The control point to use when <paramref name="time"/> is before any control points. If null, a new control point will be constructed.</param>
-        /// <returns>The active control point at <paramref name="time"/>.</returns>
-        private T binarySearch<T>(SortedList<T> list, double time, T prePoint = null)
+        /// <returns>The active control point at <paramref name="time"/>, or a fallback <see cref="ControlPoint"/> if none found.</returns>
+        private T binarySearchWithFallback<T>(IReadOnlyList<T> list, double time, T prePoint = null)
             where T : ControlPoint, new()
+        {
+            return binarySearch(list, time) ?? prePoint ?? new T();
+        }
+
+        /// <summary>
+        /// Binary searches one of the control point lists to find the active control point at <paramref name="time"/>.
+        /// </summary>
+        /// <param name="list">The list to search.</param>
+        /// <param name="time">The time to find the control point at.</param>
+        /// <returns>The active control point at <paramref name="time"/>.</returns>
+        private T binarySearch<T>(IReadOnlyList<T> list, double time)
+            where T : ControlPoint
         {
             if (list == null)
                 throw new ArgumentNullException(nameof(list));
 
             if (list.Count == 0)
-                return new T();
+                return null;
 
             if (time < list[0].Time)
-                return prePoint ?? new T();
+                return null;
 
             if (time >= list[list.Count - 1].Time)
                 return list[list.Count - 1];
@@ -125,5 +216,82 @@ namespace osu.Game.Beatmaps.ControlPoints
             // l will be the first control point with Time > time, but we want the one before it
             return list[l - 1];
         }
+
+        /// <summary>
+        /// Check whether <see cref="newPoint"/> should be added.
+        /// </summary>
+        /// <param name="time">The time to find the timing control point at.</param>
+        /// <param name="newPoint">A point to be added.</param>
+        /// <returns>Whether the new point should be added.</returns>
+        private bool checkAlreadyExisting(double time, ControlPoint newPoint)
+        {
+            ControlPoint existing = null;
+
+            switch (newPoint)
+            {
+                case TimingControlPoint _:
+                    // Timing points are a special case and need to be added regardless of fallback availability.
+                    existing = binarySearch(TimingPoints, time);
+                    break;
+
+                case EffectControlPoint _:
+                    existing = EffectPointAt(time);
+                    break;
+
+                case SampleControlPoint _:
+                    existing = SamplePointAt(time);
+                    break;
+
+                case DifficultyControlPoint _:
+                    existing = DifficultyPointAt(time);
+                    break;
+            }
+
+            return existing?.EquivalentTo(newPoint) == true;
+        }
+
+        private void groupItemAdded(ControlPoint controlPoint)
+        {
+            switch (controlPoint)
+            {
+                case TimingControlPoint typed:
+                    timingPoints.Add(typed);
+                    break;
+
+                case EffectControlPoint typed:
+                    effectPoints.Add(typed);
+                    break;
+
+                case SampleControlPoint typed:
+                    samplePoints.Add(typed);
+                    break;
+
+                case DifficultyControlPoint typed:
+                    difficultyPoints.Add(typed);
+                    break;
+            }
+        }
+
+        private void groupItemRemoved(ControlPoint controlPoint)
+        {
+            switch (controlPoint)
+            {
+                case TimingControlPoint typed:
+                    timingPoints.Remove(typed);
+                    break;
+
+                case EffectControlPoint typed:
+                    effectPoints.Remove(typed);
+                    break;
+
+                case SampleControlPoint typed:
+                    samplePoints.Remove(typed);
+                    break;
+
+                case DifficultyControlPoint typed:
+                    difficultyPoints.Remove(typed);
+                    break;
+            }
+        }
     }
 }

osu.Game/Beatmaps/ControlPoints/DifficultyControlPoint.cs

@@ -1,26 +1,33 @@
 // 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 osuTK;
+using osu.Framework.Bindables;
 
 namespace osu.Game.Beatmaps.ControlPoints
 {
-    public class DifficultyControlPoint : ControlPoint, IEquatable<DifficultyControlPoint>
+    public class DifficultyControlPoint : ControlPoint
     {
+        /// <summary>
+        /// The speed multiplier at this control point.
+        /// </summary>
+        public readonly BindableDouble SpeedMultiplierBindable = new BindableDouble(1)
+        {
+            Precision = 0.1,
+            Default = 1,
+            MinValue = 0.1,
+            MaxValue = 10
+        };
+
         /// <summary>
         /// The speed multiplier at this control point.
         /// </summary>
         public double SpeedMultiplier
         {
-            get => speedMultiplier;
-            set => speedMultiplier = MathHelper.Clamp(value, 0.1, 10);
+            get => SpeedMultiplierBindable.Value;
+            set => SpeedMultiplierBindable.Value = value;
         }
 
-        private double speedMultiplier = 1;
-
-        public bool Equals(DifficultyControlPoint other)
-            => base.Equals(other)
-               && SpeedMultiplier.Equals(other?.SpeedMultiplier);
+        public override bool EquivalentTo(ControlPoint other) =>
+            other is DifficultyControlPoint otherTyped && otherTyped.SpeedMultiplier.Equals(SpeedMultiplier);
     }
 }

osu.Game/Beatmaps/ControlPoints/EffectControlPoint.cs

@@ -1,24 +1,42 @@
 // 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 osu.Framework.Bindables;
 
 namespace osu.Game.Beatmaps.ControlPoints
 {
-    public class EffectControlPoint : ControlPoint, IEquatable<EffectControlPoint>
+    public class EffectControlPoint : ControlPoint
     {
         /// <summary>
-        /// Whether this control point enables Kiai mode.
+        /// Whether the first bar line of this control point is ignored.
         /// </summary>
-        public bool KiaiMode;
+        public readonly BindableBool OmitFirstBarLineBindable = new BindableBool();
 
         /// <summary>
         /// Whether the first bar line of this control point is ignored.
         /// </summary>
-        public bool OmitFirstBarLine;
+        public bool OmitFirstBarLine
+        {
+            get => OmitFirstBarLineBindable.Value;
+            set => OmitFirstBarLineBindable.Value = value;
+        }
 
-        public bool Equals(EffectControlPoint other)
-            => base.Equals(other)
-               && KiaiMode == other?.KiaiMode && OmitFirstBarLine == other.OmitFirstBarLine;
+        /// <summary>
+        /// Whether this control point enables Kiai mode.
+        /// </summary>
+        public readonly BindableBool KiaiModeBindable = new BindableBool();
+
+        /// <summary>
+        /// Whether this control point enables Kiai mode.
+        /// </summary>
+        public bool KiaiMode
+        {
+            get => KiaiModeBindable.Value;
+            set => KiaiModeBindable.Value = value;
+        }
+
+        public override bool EquivalentTo(ControlPoint other) =>
+            other is EffectControlPoint otherTyped &&
+            KiaiMode == otherTyped.KiaiMode && OmitFirstBarLine == otherTyped.OmitFirstBarLine;
     }
 }

osu.Game/Beatmaps/ControlPoints/SampleControlPoint.cs

@@ -1,24 +1,47 @@
 // 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 osu.Framework.Bindables;
 using osu.Game.Audio;
 
 namespace osu.Game.Beatmaps.ControlPoints
 {
-    public class SampleControlPoint : ControlPoint, IEquatable<SampleControlPoint>
+    public class SampleControlPoint : ControlPoint
     {
         public const string DEFAULT_BANK = "normal";
 
         /// <summary>
         /// The default sample bank at this control point.
         /// </summary>
-        public string SampleBank = DEFAULT_BANK;
+        public readonly Bindable<string> SampleBankBindable = new Bindable<string>(DEFAULT_BANK) { Default = DEFAULT_BANK };
+
+        /// <summary>
+        /// The speed multiplier at this control point.
+        /// </summary>
+        public string SampleBank
+        {
+            get => SampleBankBindable.Value;
+            set => SampleBankBindable.Value = value;
+        }
+
+        /// <summary>
+        /// The default sample bank at this control point.
+        /// </summary>
+        public readonly BindableInt SampleVolumeBindable = new BindableInt(100)
+        {
+            MinValue = 0,
+            MaxValue = 100,
+            Default = 100
+        };
 
         /// <summary>
         /// The default sample volume at this control point.
         /// </summary>
-        public int SampleVolume = 100;
+        public int SampleVolume
+        {
+            get => SampleVolumeBindable.Value;
+            set => SampleVolumeBindable.Value = value;
+        }
 
         /// <summary>
         /// Create a SampleInfo based on the sample settings in this control point.
@@ -45,8 +68,8 @@ namespace osu.Game.Beatmaps.ControlPoints
             return newSampleInfo;
         }
 
-        public bool Equals(SampleControlPoint other)
-            => base.Equals(other)
-               && string.Equals(SampleBank, other?.SampleBank) && SampleVolume == other?.SampleVolume;
+        public override bool EquivalentTo(ControlPoint other) =>
+            other is SampleControlPoint otherTyped &&
+            string.Equals(SampleBank, otherTyped.SampleBank) && SampleVolume == otherTyped.SampleVolume;
     }
 }

osu.Game/Beatmaps/ControlPoints/TimingControlPoint.cs

@@ -1,34 +1,50 @@
 // 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 osuTK;
+using osu.Framework.Bindables;
 using osu.Game.Beatmaps.Timing;
 
 namespace osu.Game.Beatmaps.ControlPoints
 {
-    public class TimingControlPoint : ControlPoint, IEquatable<TimingControlPoint>
+    public class TimingControlPoint : ControlPoint
     {
         /// <summary>
         /// The time signature at this control point.
         /// </summary>
-        public TimeSignatures TimeSignature = TimeSignatures.SimpleQuadruple;
+        public readonly Bindable<TimeSignatures> TimeSignatureBindable = new Bindable<TimeSignatures>(TimeSignatures.SimpleQuadruple) { Default = TimeSignatures.SimpleQuadruple };
+
+        /// <summary>
+        /// The time signature at this control point.
+        /// </summary>
+        public TimeSignatures TimeSignature
+        {
+            get => TimeSignatureBindable.Value;
+            set => TimeSignatureBindable.Value = value;
+        }
 
         public const double DEFAULT_BEAT_LENGTH = 1000;
 
         /// <summary>
         /// The beat length at this control point.
         /// </summary>
-        public virtual double BeatLength
+        public readonly BindableDouble BeatLengthBindable = new BindableDouble(DEFAULT_BEAT_LENGTH)
         {
-            get => beatLength;
-            set => beatLength = MathHelper.Clamp(value, 6, 60000);
+            Default = DEFAULT_BEAT_LENGTH,
+            MinValue = 6,
+            MaxValue = 60000
+        };
+
+        /// <summary>
+        /// The beat length at this control point.
+        /// </summary>
+        public double BeatLength
+        {
+            get => BeatLengthBindable.Value;
+            set => BeatLengthBindable.Value = value;
         }
 
-        private double beatLength = DEFAULT_BEAT_LENGTH;
-
-        public bool Equals(TimingControlPoint other)
-            => base.Equals(other)
-               && TimeSignature == other?.TimeSignature && beatLength.Equals(other.beatLength);
+        public override bool EquivalentTo(ControlPoint other) =>
+            other is TimingControlPoint otherTyped
+            && TimeSignature == otherTyped.TimeSignature && BeatLength.Equals(otherTyped.BeatLength);
     }
 }

osu.Game/Beatmaps/Formats/LegacyBeatmapDecoder.cs

@@ -2,6 +2,7 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using osu.Framework.IO.File;
@@ -50,6 +51,8 @@ namespace osu.Game.Beatmaps.Formats
 
             base.ParseStreamInto(stream, beatmap);
 
+            flushPendingPoints();
+
             // Objects may be out of order *only* if a user has manually edited an .osu file.
             // Unfortunately there are ranked maps in this state (example: https://osu.ppy.sh/s/594828).
             // OrderBy is used to guarantee that the parsing order of hitobjects with equal start times is maintained (stably-sorted)
@@ -369,104 +372,64 @@ namespace osu.Game.Beatmaps.Formats
             if (timingChange)
             {
                 var controlPoint = CreateTimingControlPoint();
-                controlPoint.Time = time;
+
                 controlPoint.BeatLength = beatLength;
                 controlPoint.TimeSignature = timeSignature;
 
-                handleTimingControlPoint(controlPoint);
+                addControlPoint(time, controlPoint, true);
             }
 
-            handleDifficultyControlPoint(new DifficultyControlPoint
+            addControlPoint(time, new LegacyDifficultyControlPoint
             {
-                Time = time,
                 SpeedMultiplier = speedMultiplier,
-                AutoGenerated = timingChange
-            });
+            }, timingChange);
 
-            handleEffectControlPoint(new EffectControlPoint
+            addControlPoint(time, new EffectControlPoint
             {
-                Time = time,
                 KiaiMode = kiaiMode,
                 OmitFirstBarLine = omitFirstBarSignature,
-                AutoGenerated = timingChange
-            });
+            }, timingChange);
 
-            handleSampleControlPoint(new LegacySampleControlPoint
+            addControlPoint(time, new LegacySampleControlPoint
             {
-                Time = time,
                 SampleBank = stringSampleSet,
                 SampleVolume = sampleVolume,
                 CustomSampleBank = customSampleBank,
-                AutoGenerated = timingChange
-            });
+            }, timingChange);
+
+            // To handle the scenario where a non-timing line shares the same time value as a subsequent timing line but
+            // appears earlier in the file, we buffer non-timing control points and rewrite them *after* control points from the timing line
+            // with the same time value (allowing them to overwrite as necessary).
+            //
+            // The expected outcome is that we prefer the non-timing line's adjustments over the timing line's adjustments when time is equal.
+            if (timingChange)
+                flushPendingPoints();
         }
 
-        private void handleTimingControlPoint(TimingControlPoint newPoint)
+        private readonly List<ControlPoint> pendingControlPoints = new List<ControlPoint>();
+        private double pendingControlPointsTime;
+
+        private void addControlPoint(double time, ControlPoint point, bool timingChange)
         {
-            var existing = beatmap.ControlPointInfo.TimingPointAt(newPoint.Time);
+            if (time != pendingControlPointsTime)
+                flushPendingPoints();
 
-            if (existing.Time == newPoint.Time)
+            if (timingChange)
             {
-                // autogenerated points should not replace non-autogenerated.
-                // this allows for incorrectly ordered timing points to still be correctly handled.
-                if (newPoint.AutoGenerated && !existing.AutoGenerated)
-                    return;
-
-                beatmap.ControlPointInfo.TimingPoints.Remove(existing);
+                beatmap.ControlPointInfo.Add(time, point);
+                return;
             }
 
-            beatmap.ControlPointInfo.TimingPoints.Add(newPoint);
+            pendingControlPoints.Add(point);
+            pendingControlPointsTime = time;
         }
 
-        private void handleDifficultyControlPoint(DifficultyControlPoint newPoint)
+        private void flushPendingPoints()
         {
-            var existing = beatmap.ControlPointInfo.DifficultyPointAt(newPoint.Time);
+            foreach (var p in pendingControlPoints)
+                beatmap.ControlPointInfo.Add(pendingControlPointsTime, p);
 
-            if (existing.Time == newPoint.Time)
-            {
-                // autogenerated points should not replace non-autogenerated.
-                // this allows for incorrectly ordered timing points to still be correctly handled.
-                if (newPoint.AutoGenerated && !existing.AutoGenerated)
-                    return;
-
-                beatmap.ControlPointInfo.DifficultyPoints.Remove(existing);
-            }
-
-            beatmap.ControlPointInfo.DifficultyPoints.Add(newPoint);
-        }
-
-        private void handleEffectControlPoint(EffectControlPoint newPoint)
-        {
-            var existing = beatmap.ControlPointInfo.EffectPointAt(newPoint.Time);
-
-            if (existing.Time == newPoint.Time)
-            {
-                // autogenerated points should not replace non-autogenerated.
-                // this allows for incorrectly ordered timing points to still be correctly handled.
-                if (newPoint.AutoGenerated && !existing.AutoGenerated)
-                    return;
-
-                beatmap.ControlPointInfo.EffectPoints.Remove(existing);
-            }
-
-            beatmap.ControlPointInfo.EffectPoints.Add(newPoint);
-        }
-
-        private void handleSampleControlPoint(SampleControlPoint newPoint)
-        {
-            var existing = beatmap.ControlPointInfo.SamplePointAt(newPoint.Time);
-
-            if (existing.Time == newPoint.Time)
-            {
-                // autogenerated points should not replace non-autogenerated.
-                // this allows for incorrectly ordered timing points to still be correctly handled.
-                if (newPoint.AutoGenerated && !existing.AutoGenerated)
-                    return;
-
-                beatmap.ControlPointInfo.SamplePoints.Remove(existing);
-            }
-
-            beatmap.ControlPointInfo.SamplePoints.Add(newPoint);
+            pendingControlPoints.Clear();
         }
 
         private void handleHitObject(string line)

osu.Game/Beatmaps/Formats/LegacyDecoder.cs

@@ -189,7 +189,15 @@ namespace osu.Game.Beatmaps.Formats
             Foreground = 3
         }
 
-        internal class LegacySampleControlPoint : SampleControlPoint, IEquatable<LegacySampleControlPoint>
+        internal class LegacyDifficultyControlPoint : DifficultyControlPoint
+        {
+            public LegacyDifficultyControlPoint()
+            {
+                SpeedMultiplierBindable.Precision = double.Epsilon;
+            }
+        }
+
+        internal class LegacySampleControlPoint : SampleControlPoint
         {
             public int CustomSampleBank;
 
@@ -203,9 +211,9 @@ namespace osu.Game.Beatmaps.Formats
                 return baseInfo;
             }
 
-            public bool Equals(LegacySampleControlPoint other)
-                => base.Equals(other)
-                   && CustomSampleBank == other?.CustomSampleBank;
+            public override bool EquivalentTo(ControlPoint other) =>
+                base.EquivalentTo(other) && other is LegacySampleControlPoint otherTyped &&
+                CustomSampleBank == otherTyped.CustomSampleBank;
         }
     }
 }

osu.Game/Beatmaps/Formats/LegacyDifficultyCalculatorBeatmapDecoder.cs

@@ -28,11 +28,15 @@ namespace osu.Game.Beatmaps.Formats
         }
 
         protected override TimingControlPoint CreateTimingControlPoint()
-            => new LegacyDifficultyCalculatorControlPoint();
+            => new LegacyDifficultyCalculatorTimingControlPoint();
 
-        private class LegacyDifficultyCalculatorControlPoint : TimingControlPoint
+        private class LegacyDifficultyCalculatorTimingControlPoint : TimingControlPoint
         {
-            public override double BeatLength { get; set; } = DEFAULT_BEAT_LENGTH;
+            public LegacyDifficultyCalculatorTimingControlPoint()
+            {
+                BeatLengthBindable.MinValue = double.MinValue;
+                BeatLengthBindable.MaxValue = double.MaxValue;
+            }
         }
     }
 }

osu.Game/Database/ArchiveModelManager.cs

@@ -108,7 +108,7 @@ namespace osu.Game.Database
             return Import(notification, paths);
         }
 
-        protected async Task Import(ProgressNotification notification, params string[] paths)
+        protected async Task<IEnumerable<TModel>> Import(ProgressNotification notification, params string[] paths)
         {
             notification.Progress = 0;
             notification.Text = $"{HumanisedModelName.Humanize(LetterCasing.Title)} import is initialising...";
@@ -168,6 +168,8 @@ namespace osu.Game.Database
 
                 notification.State = ProgressNotificationState.Completed;
             }
+
+            return imported;
         }
 
         /// <summary>

osu.Game/Database/DownloadableArchiveModelManager.cs

@@ -76,7 +76,12 @@ namespace osu.Game.Database
                 Task.Factory.StartNew(async () =>
                 {
                     // This gets scheduled back to the update thread, but we want the import to run in the background.
-                    await Import(notification, filename);
+                    var imported = await Import(notification, filename);
+
+                    // for now a failed import will be marked as a failed download for simplicity.
+                    if (!imported.Any())
+                        DownloadFailed?.Invoke(request);
+
                     currentDownloads.Remove(request);
                 }, TaskCreationOptions.LongRunning);
             };

osu.Game/Database/OsuDbContext.cs

@@ -166,19 +166,6 @@ namespace osu.Game.Database
                 // no-op. called by tooling.
             }
 
-            private class OsuDbLoggerProvider : ILoggerProvider
-            {
-                #region Disposal
-
-                public void Dispose()
-                {
-                }
-
-                #endregion
-
-                public ILogger CreateLogger(string categoryName) => new OsuDbLogger();
-            }
-
             private class OsuDbLogger : ILogger
             {
                 public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)

osu.Game/Graphics/Containers/BeatSyncedContainer.cs

@@ -104,14 +104,10 @@ namespace osu.Game.Graphics.Containers
             defaultTiming = new TimingControlPoint
             {
                 BeatLength = default_beat_length,
-                AutoGenerated = true,
-                Time = 0
             };
 
             defaultEffect = new EffectControlPoint
             {
-                Time = 0,
-                AutoGenerated = true,
                 KiaiMode = false,
                 OmitFirstBarLine = false
             };

osu.Game/Graphics/Containers/WaveContainer.cs

@@ -159,8 +159,15 @@ namespace osu.Game.Graphics.Containers
                 Height = Parent.Parent.DrawSize.Y * 1.5f;
             }
 
-            protected override void PopIn() => this.MoveToY(FinalPosition, APPEAR_DURATION, easing_show);
-            protected override void PopOut() => this.MoveToY(Parent.Parent.DrawSize.Y, DISAPPEAR_DURATION, easing_hide);
+            protected override void PopIn() => Schedule(() => this.MoveToY(FinalPosition, APPEAR_DURATION, easing_show));
+
+            protected override void PopOut()
+            {
+                double duration = IsLoaded ? DISAPPEAR_DURATION : 0;
+
+                // scheduling is required as parent may not be present at the time this is called.
+                Schedule(() => this.MoveToY(Parent.Parent.DrawSize.Y, duration, easing_hide));
+            }
         }
     }
 }

osu.Game/Graphics/UserInterface/LoadingButton.cs

@@ -0,0 +1,85 @@
+// 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.Graphics;
+using osu.Framework.Input.Events;
+using osu.Game.Graphics.Containers;
+using osuTK;
+
+namespace osu.Game.Graphics.UserInterface
+{
+    public abstract class LoadingButton : OsuHoverContainer
+    {
+        private bool isLoading;
+
+        public bool IsLoading
+        {
+            get => isLoading;
+            set
+            {
+                isLoading = value;
+
+                Enabled.Value = !isLoading;
+
+                if (value)
+                {
+                    loading.Show();
+                    OnLoadStarted();
+                }
+                else
+                {
+                    loading.Hide();
+                    OnLoadFinished();
+                }
+            }
+        }
+
+        public Vector2 LoadingAnimationSize
+        {
+            get => loading.Size;
+            set => loading.Size = value;
+        }
+
+        private readonly LoadingAnimation loading;
+
+        protected LoadingButton()
+        {
+            AddRange(new[]
+            {
+                CreateContent(),
+                loading = new LoadingAnimation
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Size = new Vector2(12)
+                }
+            });
+        }
+
+        protected override bool OnClick(ClickEvent e)
+        {
+            if (!Enabled.Value)
+                return false;
+
+            try
+            {
+                return base.OnClick(e);
+            }
+            finally
+            {
+                // run afterwards as this will disable this button.
+                IsLoading = true;
+            }
+        }
+
+        protected virtual void OnLoadStarted()
+        {
+        }
+
+        protected virtual void OnLoadFinished()
+        {
+        }
+
+        protected abstract Drawable CreateContent();
+    }
+}

osu.Game/Graphics/UserInterface/OsuButton.cs

@@ -59,7 +59,7 @@ namespace osu.Game.Graphics.UserInterface
         protected override bool OnHover(HoverEvent e)
         {
             hover.FadeIn(200);
-            return base.OnHover(e);
+            return true;
         }
 
         protected override void OnHoverLost(HoverLostEvent e)

osu.Game/Graphics/UserInterface/OsuSliderBar.cs

@@ -17,7 +17,7 @@ using osu.Framework.Input.Events;
 namespace osu.Game.Graphics.UserInterface
 {
     public class OsuSliderBar<T> : SliderBar<T>, IHasTooltip, IHasAccentColour
-        where T : struct, IEquatable<T>, IComparable, IConvertible
+        where T : struct, IEquatable<T>, IComparable<T>, IConvertible
     {
         /// <summary>
         /// Maximum number of decimal digits to be displayed in the tooltip.

osu.Game/Graphics/UserInterface/SearchTextBox.cs

@@ -14,8 +14,6 @@ namespace osu.Game.Graphics.UserInterface
     {
         protected virtual bool AllowCommit => false;
 
-        public override bool HandleLeftRightArrows => false;
-
         public SearchTextBox()
         {
             Height = 35;

osu.Game/Graphics/UserInterface/SeekLimitedSearchTextBox.cs

@@ -0,0 +1,13 @@
+// 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.Graphics.UserInterface
+{
+    /// <summary>
+    /// A <see cref="SearchTextBox"/> which does not handle left/right arrow keys for seeking.
+    /// </summary>
+    public class SeekLimitedSearchTextBox : SearchTextBox
+    {
+        public override bool HandleLeftRightArrows => false;
+    }
+}

osu.Game/Graphics/UserInterface/ShowMoreButton.cs

@@ -5,8 +5,6 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Graphics.Sprites;
-using osu.Framework.Input.Events;
-using osu.Game.Graphics.Containers;
 using osu.Game.Graphics.Sprites;
 using osuTK;
 using osuTK.Graphics;
@@ -14,9 +12,9 @@ using System.Collections.Generic;
 
 namespace osu.Game.Graphics.UserInterface
 {
-    public class ShowMoreButton : OsuHoverContainer
+    public class ShowMoreButton : LoadingButton
     {
-        private const float fade_duration = 200;
+        private const int duration = 200;
 
         private Color4 chevronIconColour;
 
@@ -32,100 +30,55 @@ namespace osu.Game.Graphics.UserInterface
             set => text.Text = value;
         }
 
-        private bool isLoading;
-
-        public bool IsLoading
-        {
-            get => isLoading;
-            set
-            {
-                isLoading = value;
-
-                Enabled.Value = !isLoading;
-
-                if (value)
-                {
-                    loading.Show();
-                    content.FadeOut(fade_duration, Easing.OutQuint);
-                }
-                else
-                {
-                    loading.Hide();
-                    content.FadeIn(fade_duration, Easing.OutQuint);
-                }
-            }
-        }
-
-        private readonly Box background;
-        private readonly LoadingAnimation loading;
-        private readonly FillFlowContainer content;
-        private readonly ChevronIcon leftChevron;
-        private readonly ChevronIcon rightChevron;
-        private readonly SpriteText text;
-
         protected override IEnumerable<Drawable> EffectTargets => new[] { background };
 
+        private ChevronIcon leftChevron;
+        private ChevronIcon rightChevron;
+        private SpriteText text;
+        private Box background;
+        private FillFlowContainer textContainer;
+
         public ShowMoreButton()
         {
             AutoSizeAxes = Axes.Both;
+        }
+
+        protected override Drawable CreateContent() => new CircularContainer
+        {
+            Masking = true,
+            Size = new Vector2(140, 30),
             Children = new Drawable[]
             {
-                new CircularContainer
+                background = new Box
                 {
-                    Masking = true,
-                    Size = new Vector2(140, 30),
+                    RelativeSizeAxes = Axes.Both,
+                },
+                textContainer = new FillFlowContainer
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    AutoSizeAxes = Axes.Both,
+                    Direction = FillDirection.Horizontal,
+                    Spacing = new Vector2(7),
                     Children = new Drawable[]
                     {
-                        background = new Box
-                        {
-                            RelativeSizeAxes = Axes.Both,
-                        },
-                        content = new FillFlowContainer
+                        leftChevron = new ChevronIcon(),
+                        text = new OsuSpriteText
                         {
                             Anchor = Anchor.Centre,
                             Origin = Anchor.Centre,
-                            AutoSizeAxes = Axes.Both,
-                            Direction = FillDirection.Horizontal,
-                            Spacing = new Vector2(7),
-                            Children = new Drawable[]
-                            {
-                                leftChevron = new ChevronIcon(),
-                                text = new OsuSpriteText
-                                {
-                                    Anchor = Anchor.Centre,
-                                    Origin = Anchor.Centre,
-                                    Font = OsuFont.GetFont(size: 12, weight: FontWeight.Bold),
-                                    Text = "show more".ToUpper(),
-                                },
-                                rightChevron = new ChevronIcon(),
-                            }
-                        },
-                        loading = new LoadingAnimation
-                        {
-                            Anchor = Anchor.Centre,
-                            Origin = Anchor.Centre,
-                            Size = new Vector2(12)
+                            Font = OsuFont.GetFont(size: 12, weight: FontWeight.Bold),
+                            Text = "show more".ToUpper(),
                         },
+                        rightChevron = new ChevronIcon(),
                     }
                 }
-            };
-        }
-
-        protected override bool OnClick(ClickEvent e)
-        {
-            if (!Enabled.Value)
-                return false;
-
-            try
-            {
-                return base.OnClick(e);
             }
-            finally
-            {
-                // run afterwards as this will disable this button.
-                IsLoading = true;
-            }
-        }
+        };
+
+        protected override void OnLoadStarted() => textContainer.FadeOut(duration, Easing.OutQuint);
+
+        protected override void OnLoadFinished() => textContainer.FadeIn(duration, Easing.OutQuint);
 
         private class ChevronIcon : SpriteIcon
         {

osu.Game/Graphics/UserInterfaceV2/LabelledComponent.cs

@@ -1,132 +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 osu.Framework.Allocation;
+using osu.Framework.Bindables;
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Shapes;
-using osu.Game.Graphics.Containers;
-using osuTK;
+using osu.Framework.Graphics.UserInterface;
 
 namespace osu.Game.Graphics.UserInterfaceV2
 {
-    public abstract class LabelledComponent<T> : CompositeDrawable
-        where T : Drawable
+    public abstract class LabelledComponent<T, U> : LabelledDrawable<T>, IHasCurrentValue<U>
+        where T : Drawable, IHasCurrentValue<U>
     {
-        protected const float CONTENT_PADDING_VERTICAL = 10;
-        protected const float CONTENT_PADDING_HORIZONTAL = 15;
-        protected const float CORNER_RADIUS = 15;
-
-        /// <summary>
-        /// The component that is being displayed.
-        /// </summary>
-        protected readonly T Component;
-
-        private readonly OsuTextFlowContainer labelText;
-        private readonly OsuTextFlowContainer descriptionText;
-
-        /// <summary>
-        /// Creates a new <see cref="LabelledComponent{T}"/>.
-        /// </summary>
-        /// <param name="padded">Whether the component should be padded or should be expanded to the bounds of this <see cref="LabelledComponent{T}"/>.</param>
         protected LabelledComponent(bool padded)
+            : base(padded)
         {
-            RelativeSizeAxes = Axes.X;
-            AutoSizeAxes = Axes.Y;
-
-            CornerRadius = CORNER_RADIUS;
-            Masking = true;
-
-            InternalChildren = new Drawable[]
-            {
-                new Box
-                {
-                    RelativeSizeAxes = Axes.Both,
-                    Colour = OsuColour.FromHex("1c2125"),
-                },
-                new FillFlowContainer
-                {
-                    RelativeSizeAxes = Axes.X,
-                    AutoSizeAxes = Axes.Y,
-                    Direction = FillDirection.Vertical,
-                    Padding = padded
-                        ? new MarginPadding { Horizontal = CONTENT_PADDING_HORIZONTAL, Vertical = CONTENT_PADDING_VERTICAL }
-                        : new MarginPadding { Left = CONTENT_PADDING_HORIZONTAL },
-                    Spacing = new Vector2(0, 12),
-                    Children = new Drawable[]
-                    {
-                        new GridContainer
-                        {
-                            RelativeSizeAxes = Axes.X,
-                            AutoSizeAxes = Axes.Y,
-                            Content = new[]
-                            {
-                                new Drawable[]
-                                {
-                                    labelText = new OsuTextFlowContainer(s => s.Font = OsuFont.GetFont(weight: FontWeight.Bold))
-                                    {
-                                        Anchor = Anchor.CentreLeft,
-                                        Origin = Anchor.CentreLeft,
-                                        AutoSizeAxes = Axes.Both,
-                                        Padding = new MarginPadding { Right = 20 }
-                                    },
-                                    new Container
-                                    {
-                                        Anchor = Anchor.CentreRight,
-                                        Origin = Anchor.CentreRight,
-                                        RelativeSizeAxes = Axes.X,
-                                        AutoSizeAxes = Axes.Y,
-                                        Child = Component = CreateComponent().With(d =>
-                                        {
-                                            d.Anchor = Anchor.CentreRight;
-                                            d.Origin = Anchor.CentreRight;
-                                        })
-                                    }
-                                },
-                            },
-                            RowDimensions = new[] { new Dimension(GridSizeMode.AutoSize) },
-                            ColumnDimensions = new[] { new Dimension(GridSizeMode.AutoSize) }
-                        },
-                        descriptionText = new OsuTextFlowContainer(s => s.Font = OsuFont.GetFont(size: 12, weight: FontWeight.Bold, italics: true))
-                        {
-                            RelativeSizeAxes = Axes.X,
-                            AutoSizeAxes = Axes.Y,
-                            Padding = new MarginPadding { Bottom = padded ? 0 : CONTENT_PADDING_VERTICAL },
-                            Alpha = 0,
-                        }
-                    }
-                }
-            };
         }
 
-        [BackgroundDependencyLoader]
-        private void load(OsuColour osuColour)
+        public Bindable<U> Current
         {
-            descriptionText.Colour = osuColour.Yellow;
+            get => Component.Current;
+            set => Component.Current = value;
         }
-
-        public string Label
-        {
-            set => labelText.Text = value;
-        }
-
-        public string Description
-        {
-            set
-            {
-                descriptionText.Text = value;
-
-                if (!string.IsNullOrEmpty(value))
-                    descriptionText.Show();
-                else
-                    descriptionText.Hide();
-            }
-        }
-
-        /// <summary>
-        /// Creates the component that should be displayed.
-        /// </summary>
-        /// <returns>The component.</returns>
-        protected abstract T CreateComponent();
     }
 }

osu.Game/Graphics/UserInterfaceV2/LabelledDrawable.cs

@@ -0,0 +1,132 @@
+// 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 osuTK;
+
+namespace osu.Game.Graphics.UserInterfaceV2
+{
+    public abstract class LabelledDrawable<T> : CompositeDrawable
+        where T : Drawable
+    {
+        protected const float CONTENT_PADDING_VERTICAL = 10;
+        protected const float CONTENT_PADDING_HORIZONTAL = 15;
+        protected const float CORNER_RADIUS = 15;
+
+        /// <summary>
+        /// The component that is being displayed.
+        /// </summary>
+        protected readonly T Component;
+
+        private readonly OsuTextFlowContainer labelText;
+        private readonly OsuTextFlowContainer descriptionText;
+
+        /// <summary>
+        /// Creates a new <see cref="LabelledComponent{T, U}"/>.
+        /// </summary>
+        /// <param name="padded">Whether the component should be padded or should be expanded to the bounds of this <see cref="LabelledComponent{T, U}"/>.</param>
+        protected LabelledDrawable(bool padded)
+        {
+            RelativeSizeAxes = Axes.X;
+            AutoSizeAxes = Axes.Y;
+
+            CornerRadius = CORNER_RADIUS;
+            Masking = true;
+
+            InternalChildren = new Drawable[]
+            {
+                new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Colour = OsuColour.FromHex("1c2125"),
+                },
+                new FillFlowContainer
+                {
+                    RelativeSizeAxes = Axes.X,
+                    AutoSizeAxes = Axes.Y,
+                    Direction = FillDirection.Vertical,
+                    Padding = padded
+                        ? new MarginPadding { Horizontal = CONTENT_PADDING_HORIZONTAL, Vertical = CONTENT_PADDING_VERTICAL }
+                        : new MarginPadding { Left = CONTENT_PADDING_HORIZONTAL },
+                    Spacing = new Vector2(0, 12),
+                    Children = new Drawable[]
+                    {
+                        new GridContainer
+                        {
+                            RelativeSizeAxes = Axes.X,
+                            AutoSizeAxes = Axes.Y,
+                            Content = new[]
+                            {
+                                new Drawable[]
+                                {
+                                    labelText = new OsuTextFlowContainer(s => s.Font = OsuFont.GetFont(weight: FontWeight.Bold))
+                                    {
+                                        Anchor = Anchor.CentreLeft,
+                                        Origin = Anchor.CentreLeft,
+                                        AutoSizeAxes = Axes.Both,
+                                        Padding = new MarginPadding { Right = 20 }
+                                    },
+                                    new Container
+                                    {
+                                        Anchor = Anchor.CentreRight,
+                                        Origin = Anchor.CentreRight,
+                                        RelativeSizeAxes = Axes.X,
+                                        AutoSizeAxes = Axes.Y,
+                                        Child = Component = CreateComponent().With(d =>
+                                        {
+                                            d.Anchor = Anchor.CentreRight;
+                                            d.Origin = Anchor.CentreRight;
+                                        })
+                                    }
+                                },
+                            },
+                            RowDimensions = new[] { new Dimension(GridSizeMode.AutoSize) },
+                            ColumnDimensions = new[] { new Dimension(GridSizeMode.AutoSize) }
+                        },
+                        descriptionText = new OsuTextFlowContainer(s => s.Font = OsuFont.GetFont(size: 12, weight: FontWeight.Bold, italics: true))
+                        {
+                            RelativeSizeAxes = Axes.X,
+                            AutoSizeAxes = Axes.Y,
+                            Padding = new MarginPadding { Bottom = padded ? 0 : CONTENT_PADDING_VERTICAL },
+                            Alpha = 0,
+                        }
+                    }
+                }
+            };
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour osuColour)
+        {
+            descriptionText.Colour = osuColour.Yellow;
+        }
+
+        public string Label
+        {
+            set => labelText.Text = value;
+        }
+
+        public string Description
+        {
+            set
+            {
+                descriptionText.Text = value;
+
+                if (!string.IsNullOrEmpty(value))
+                    descriptionText.Show();
+                else
+                    descriptionText.Hide();
+            }
+        }
+
+        /// <summary>
+        /// Creates the component that should be displayed.
+        /// </summary>
+        /// <returns>The component.</returns>
+        protected abstract T CreateComponent();
+    }
+}

osu.Game/Graphics/UserInterfaceV2/LabelledSwitchButton.cs

@@ -3,7 +3,7 @@
 
 namespace osu.Game.Graphics.UserInterfaceV2
 {
-    public class LabelledSwitchButton : LabelledComponent<SwitchButton>
+    public class LabelledSwitchButton : LabelledComponent<SwitchButton, bool>
     {
         public LabelledSwitchButton()
             : base(true)

osu.Game/Graphics/UserInterfaceV2/LabelledTextBox.cs

@@ -8,7 +8,7 @@ using osu.Game.Graphics.UserInterface;
 
 namespace osu.Game.Graphics.UserInterfaceV2
 {
-    public class LabelledTextBox : LabelledComponent<OsuTextBox>
+    public class LabelledTextBox : LabelledComponent<OsuTextBox, string>
     {
         public event TextBox.OnCommitHandler OnCommit;
 

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

@@ -0,0 +1,36 @@
+// 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.IO.Network;
+using osu.Game.Online.API.Requests.Responses;
+using System.Net.Http;
+
+namespace osu.Game.Online.API.Requests
+{
+    public class CommentVoteRequest : APIRequest<CommentBundle>
+    {
+        private readonly long id;
+        private readonly CommentVoteAction action;
+
+        public CommentVoteRequest(long id, CommentVoteAction action)
+        {
+            this.id = id;
+            this.action = action;
+        }
+
+        protected override WebRequest CreateWebRequest()
+        {
+            var req = base.CreateWebRequest();
+            req.Method = action == CommentVoteAction.Vote ? HttpMethod.Post : HttpMethod.Delete;
+            return req;
+        }
+
+        protected override string Target => $@"comments/{id}/vote";
+    }
+
+    public enum CommentVoteAction
+    {
+        Vote,
+        UnVote
+    }
+}

osu.Game/Online/API/Requests/Responses/Comment.cs

@@ -72,6 +72,8 @@ namespace osu.Game.Online.API.Requests.Responses
 
         public bool HasMessage => !string.IsNullOrEmpty(MessageHtml);
 
+        public bool IsVoted { get; set; }
+
         public string GetMessage => HasMessage ? WebUtility.HtmlDecode(Regex.Replace(MessageHtml, @"<(.|\n)*?>", string.Empty)) : string.Empty;
 
         public int DeletedChildrenCount => ChildComments.Count(c => c.IsDeleted);

osu.Game/Online/API/Requests/Responses/CommentBundle.cs

@@ -47,6 +47,22 @@ namespace osu.Game.Online.API.Requests.Responses
         [JsonProperty(@"included_comments")]
         public List<Comment> IncludedComments { get; set; }
 
+        [JsonProperty(@"user_votes")]
+        private List<long> userVotes
+        {
+            set
+            {
+                value.ForEach(v =>
+                {
+                    Comments.ForEach(c =>
+                    {
+                        if (v == c.Id)
+                            c.IsVoted = true;
+                    });
+                });
+            }
+        }
+
         private List<User> users;
 
         [JsonProperty(@"users")]

osu.Game/Online/Chat/Channel.cs

@@ -14,7 +14,7 @@ namespace osu.Game.Online.Chat
 {
     public class Channel
     {
-        public readonly int MaxHistory = 300;
+        public const int MAX_HISTORY = 300;
 
         /// <summary>
         /// Contains every joined user except the current logged in user. Currently only returned for PM channels.
@@ -80,8 +80,6 @@ namespace osu.Game.Online.Chat
         /// </summary>
         public Bindable<bool> Joined = new Bindable<bool>();
 
-        public const int MAX_HISTORY = 300;
-
         [JsonConstructor]
         public Channel()
         {
@@ -162,8 +160,8 @@ namespace osu.Game.Online.Chat
         {
             // never purge local echos
             int messageCount = Messages.Count - pendingMessages.Count;
-            if (messageCount > MaxHistory)
-                Messages.RemoveRange(0, messageCount - MaxHistory);
+            if (messageCount > MAX_HISTORY)
+                Messages.RemoveRange(0, messageCount - MAX_HISTORY);
         }
     }
 }

osu.Game/Online/Chat/MessageFormatter.cs

@@ -20,7 +20,7 @@ namespace osu.Game.Online.Chat
         private static readonly Regex new_link_regex = new Regex(@"\[(?<url>[a-z]+://[^ ]+) (?<text>(((?<=\\)[\[\]])|[^\[\]])*(((?<open>\[)(((?<=\\)[\[\]])|[^\[\]])*)+((?<close-open>\])(((?<=\\)[\[\]])|[^\[\]])*)+)*(?(open)(?!)))\]");
 
         // [test](https://osu.ppy.sh/b/1234) -> test (https://osu.ppy.sh/b/1234) aka correct markdown format
-        private static readonly Regex markdown_link_regex = new Regex(@"\[(?<text>(((?<=\\)[\[\]])|[^\[\]])*(((?<open>\[)(((?<=\\)[\[\]])|[^\[\]])*)+((?<close-open>\])(((?<=\\)[\[\]])|[^\[\]])*)+)*(?(open)(?!)))\]\((?<url>[a-z]+://[^ ]+)\)");
+        private static readonly Regex markdown_link_regex = new Regex(@"\[(?<text>(((?<=\\)[\[\]])|[^\[\]])*(((?<open>\[)(((?<=\\)[\[\]])|[^\[\]])*)+((?<close-open>\])(((?<=\\)[\[\]])|[^\[\]])*)+)*(?(open)(?!)))\]\((?<url>[a-z]+://[^ ]+)(\s+(?<title>""([^""]|(?<=\\)"")*""))?\)");
 
         // advanced, RFC-compatible regular expression that matches any possible URL, *but* allows certain invalid characters that are widely used
         // This is in the format (<required>, [optional]):
@@ -95,11 +95,17 @@ namespace osu.Game.Online.Chat
             foreach (Match m in regex.Matches(result.Text, startIndex))
             {
                 var index = m.Index;
-                var link = m.Groups["link"].Value;
-                var indexLength = link.Length;
+                var linkText = m.Groups["link"].Value;
+                var indexLength = linkText.Length;
 
-                var details = getLinkDetails(link);
-                result.Links.Add(new Link(link, index, indexLength, details.Action, details.Argument));
+                var details = getLinkDetails(linkText);
+                var link = new Link(linkText, index, indexLength, details.Action, details.Argument);
+
+                // sometimes an already-processed formatted link can reduce to a simple URL, too
+                // (example: [mean example - https://osu.ppy.sh](https://osu.ppy.sh))
+                // therefore we need to check if any of the pre-existing links contains the raw one we found
+                if (result.Links.All(existingLink => !existingLink.Overlaps(link)))
+                    result.Links.Add(link);
             }
         }
 
@@ -292,6 +298,8 @@ namespace osu.Game.Online.Chat
             Argument = argument;
         }
 
+        public bool Overlaps(Link otherLink) => Index < otherLink.Index + otherLink.Length && otherLink.Index < Index + Length;
+
         public int CompareTo(Link otherLink) => Index > otherLink.Index ? 1 : -1;
     }
 }

osu.Game/Online/Chat/StandAloneChatDisplay.cs

@@ -8,6 +8,7 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Graphics.UserInterface;
+using osu.Game.Graphics;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Overlays.Chat;
 using osuTK.Graphics;
@@ -124,6 +125,8 @@ namespace osu.Game.Online.Chat
 
             protected override ChatLine CreateChatLine(Message m) => CreateChatLineAction(m);
 
+            protected override DaySeparator CreateDaySeparator(DateTimeOffset time) => new CustomDaySeparator(time);
+
             public StandAloneDrawableChannel(Channel channel)
                 : base(channel)
             {
@@ -134,6 +137,24 @@ namespace osu.Game.Online.Chat
             {
                 ChatLineFlow.Padding = new MarginPadding { Horizontal = 0 };
             }
+
+            private class CustomDaySeparator : DaySeparator
+            {
+                public CustomDaySeparator(DateTimeOffset time)
+                    : base(time)
+                {
+                }
+
+                [BackgroundDependencyLoader]
+                private void load(OsuColour colours)
+                {
+                    Colour = colours.Yellow;
+                    TextSize = 14;
+                    LineHeight = 1;
+                    Padding = new MarginPadding { Horizontal = 10 };
+                    Margin = new MarginPadding { Vertical = 5 };
+                }
+            }
         }
 
         protected class StandAloneMessage : ChatLine

osu.Game/Overlays/AccountCreation/ScreenEntry.cs

@@ -138,18 +138,13 @@ namespace osu.Game.Overlays.AccountCreation
             passwordTextBox.Current.ValueChanged += password => { characterCheckText.ForEach(s => s.Colour = password.NewValue.Length == 0 ? Color4.White : Interpolation.ValueAt(password.NewValue.Length, Color4.OrangeRed, Color4.YellowGreen, 0, 8, Easing.In)); };
         }
 
-        protected override void Update()
-        {
-            base.Update();
-
-            if (host?.OnScreenKeyboardOverlapsGameWindow != true && !textboxes.Any(t => t.HasFocus))
-                focusNextTextbox();
-        }
-
         public override void OnEntering(IScreen last)
         {
             base.OnEntering(last);
             processingOverlay.Hide();
+
+            if (host?.OnScreenKeyboardOverlapsGameWindow != true)
+                focusNextTextbox();
         }
 
         private void performRegistration()

osu.Game/Overlays/Chat/DrawableChannel.cs

@@ -1,4 +1,4 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// 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;
@@ -12,15 +12,22 @@ using osu.Framework.Graphics.Containers;
 using osu.Game.Graphics.Containers;
 using osu.Game.Graphics.Cursor;
 using osu.Game.Online.Chat;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics.Sprites;
 
 namespace osu.Game.Overlays.Chat
 {
     public class DrawableChannel : Container
     {
         public readonly Channel Channel;
-        protected ChatLineContainer ChatLineFlow;
+        protected FillFlowContainer ChatLineFlow;
         private OsuScrollContainer scroll;
 
+        [Resolved]
+        private OsuColour colours { get; set; }
+
         public DrawableChannel(Channel channel)
         {
             Channel = channel;
@@ -40,7 +47,7 @@ namespace osu.Game.Overlays.Chat
                     // Some chat lines have effects that slightly protrude to the bottom,
                     // which we do not want to mask away, hence the padding.
                     Padding = new MarginPadding { Bottom = 5 },
-                    Child = ChatLineFlow = new ChatLineContainer
+                    Child = ChatLineFlow = new FillFlowContainer
                     {
                         Padding = new MarginPadding { Left = 20, Right = 20 },
                         RelativeSizeAxes = Axes.X,
@@ -74,31 +81,61 @@ namespace osu.Game.Overlays.Chat
 
         protected virtual ChatLine CreateChatLine(Message m) => new ChatLine(m);
 
+        protected virtual DaySeparator CreateDaySeparator(DateTimeOffset time) => new DaySeparator(time)
+        {
+            Margin = new MarginPadding { Vertical = 10 },
+            Colour = colours.ChatBlue.Lighten(0.7f),
+        };
+
         private void newMessagesArrived(IEnumerable<Message> newMessages)
         {
+            bool shouldScrollToEnd = scroll.IsScrolledToEnd(10) || !chatLines.Any() || newMessages.Any(m => m is LocalMessage);
+
             // Add up to last Channel.MAX_HISTORY messages
-            var displayMessages = newMessages.Skip(Math.Max(0, newMessages.Count() - Channel.MaxHistory));
+            var displayMessages = newMessages.Skip(Math.Max(0, newMessages.Count() - Channel.MAX_HISTORY));
 
-            ChatLineFlow.AddRange(displayMessages.Select(CreateChatLine));
+            Message lastMessage = chatLines.LastOrDefault()?.Message;
 
-            if (scroll.IsScrolledToEnd(10) || !ChatLineFlow.Children.Any() || newMessages.Any(m => m is LocalMessage))
-                scrollToEnd();
-
-            var staleMessages = ChatLineFlow.Children.Where(c => c.LifetimeEnd == double.MaxValue).ToArray();
-            int count = staleMessages.Length - Channel.MaxHistory;
-
-            for (int i = 0; i < count; i++)
+            foreach (var message in displayMessages)
             {
-                var d = staleMessages[i];
-                if (!scroll.IsScrolledToEnd(10))
-                    scroll.OffsetScrollPosition(-d.DrawHeight);
-                d.Expire();
+                if (lastMessage == null || lastMessage.Timestamp.ToLocalTime().Date != message.Timestamp.ToLocalTime().Date)
+                    ChatLineFlow.Add(CreateDaySeparator(message.Timestamp));
+
+                ChatLineFlow.Add(CreateChatLine(message));
+                lastMessage = message;
             }
+
+            var staleMessages = chatLines.Where(c => c.LifetimeEnd == double.MaxValue).ToArray();
+            int count = staleMessages.Length - Channel.MAX_HISTORY;
+
+            if (count > 0)
+            {
+                void expireAndAdjustScroll(Drawable d)
+                {
+                    scroll.OffsetScrollPosition(-d.DrawHeight);
+                    d.Expire();
+                }
+
+                for (int i = 0; i < count; i++)
+                    expireAndAdjustScroll(staleMessages[i]);
+
+                // remove all adjacent day separators after stale message removal
+                for (int i = 0; i < ChatLineFlow.Count - 1; i++)
+                {
+                    if (!(ChatLineFlow[i] is DaySeparator)) break;
+                    if (!(ChatLineFlow[i + 1] is DaySeparator)) break;
+
+                    expireAndAdjustScroll(ChatLineFlow[i]);
+                }
+            }
+
+            if (shouldScrollToEnd)
+                scrollToEnd();
         }
 
         private void pendingMessageResolved(Message existing, Message updated)
         {
-            var found = ChatLineFlow.Children.LastOrDefault(c => c.Message == existing);
+            var found = chatLines.LastOrDefault(c => c.Message == existing);
 
             if (found != null)
             {
@@ -112,19 +149,74 @@ namespace osu.Game.Overlays.Chat
 
         private void messageRemoved(Message removed)
         {
-            ChatLineFlow.Children.FirstOrDefault(c => c.Message == removed)?.FadeColour(Color4.Red, 400).FadeOut(600).Expire();
+            chatLines.FirstOrDefault(c => c.Message == removed)?.FadeColour(Color4.Red, 400).FadeOut(600).Expire();
         }
 
+        private IEnumerable<ChatLine> chatLines => ChatLineFlow.Children.OfType<ChatLine>();
+
         private void scrollToEnd() => ScheduleAfterChildren(() => scroll.ScrollToEnd());
 
-        protected class ChatLineContainer : FillFlowContainer<ChatLine>
+        public class DaySeparator : Container
         {
-            protected override int Compare(Drawable x, Drawable y)
+            public float TextSize
             {
-                var xC = (ChatLine)x;
-                var yC = (ChatLine)y;
+                get => text.Font.Size;
+                set => text.Font = text.Font.With(size: value);
+            }
 
-                return xC.Message.CompareTo(yC.Message);
+            private float lineHeight = 2;
+
+            public float LineHeight
+            {
+                get => lineHeight;
+                set => lineHeight = leftBox.Height = rightBox.Height = value;
+            }
+
+            private readonly SpriteText text;
+            private readonly Box leftBox;
+            private readonly Box rightBox;
+
+            public DaySeparator(DateTimeOffset time)
+            {
+                RelativeSizeAxes = Axes.X;
+                AutoSizeAxes = Axes.Y;
+                Child = new GridContainer
+                {
+                    RelativeSizeAxes = Axes.X,
+                    AutoSizeAxes = Axes.Y,
+                    ColumnDimensions = new[]
+                    {
+                        new Dimension(),
+                        new Dimension(GridSizeMode.AutoSize),
+                        new Dimension(),
+                    },
+                    RowDimensions = new[] { new Dimension(GridSizeMode.AutoSize), },
+                    Content = new[]
+                    {
+                        new Drawable[]
+                        {
+                            leftBox = new Box
+                            {
+                                Anchor = Anchor.Centre,
+                                Origin = Anchor.Centre,
+                                RelativeSizeAxes = Axes.X,
+                                Height = lineHeight,
+                            },
+                            text = new SpriteText
+                            {
+                                Margin = new MarginPadding { Horizontal = 10 },
+                                Text = time.ToLocalTime().ToString("dd MMM yyyy"),
+                            },
+                            rightBox = new Box
+                            {
+                                Anchor = Anchor.Centre,
+                                Origin = Anchor.Centre,
+                                RelativeSizeAxes = Axes.X,
+                                Height = lineHeight,
+                            },
+                        }
+                    }
+                };
             }
         }
     }

osu.Game/Overlays/Comments/DrawableComment.cs

@@ -55,7 +55,7 @@ namespace osu.Game.Overlays.Comments
                     {
                         RelativeSizeAxes = Axes.X,
                         AutoSizeAxes = Axes.Y,
-                        Padding = new MarginPadding(margin),
+                        Padding = new MarginPadding(margin) { Left = margin + 5 },
                         Child = content = new GridContainer
                         {
                             RelativeSizeAxes = Axes.X,
@@ -81,11 +81,17 @@ namespace osu.Game.Overlays.Comments
                                         Spacing = new Vector2(5, 0),
                                         Children = new Drawable[]
                                         {
-                                            votePill = new VotePill(comment.VotesCount)
+                                            new Container
                                             {
                                                 Anchor = Anchor.Centre,
                                                 Origin = Anchor.Centre,
-                                                AlwaysPresent = true,
+                                                Width = 40,
+                                                AutoSizeAxes = Axes.Y,
+                                                Child = votePill = new VotePill(comment)
+                                                {
+                                                    Anchor = Anchor.CentreRight,
+                                                    Origin = Anchor.CentreRight,
+                                                }
                                             },
                                             new UpdateableAvatar(comment.User)
                                             {
@@ -333,31 +339,5 @@ namespace osu.Game.Overlays.Comments
                 return parentComment.HasMessage ? parentComment.GetMessage : parentComment.IsDeleted ? @"deleted" : string.Empty;
             }
         }
-
-        private class VotePill : CircularContainer
-        {
-            public VotePill(int count)
-            {
-                AutoSizeAxes = Axes.X;
-                Height = 20;
-                Masking = true;
-                Children = new Drawable[]
-                {
-                    new Box
-                    {
-                        RelativeSizeAxes = Axes.Both,
-                        Colour = OsuColour.Gray(0.05f)
-                    },
-                    new SpriteText
-                    {
-                        Anchor = Anchor.Centre,
-                        Origin = Anchor.Centre,
-                        Margin = new MarginPadding { Horizontal = margin },
-                        Font = OsuFont.GetFont(size: 14),
-                        Text = $"+{count}"
-                    }
-                };
-            }
-        }
     }
 }

osu.Game/Overlays/Comments/VotePill.cs

@@ -0,0 +1,183 @@
+// 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.Graphics.Containers;
+using osu.Framework.Graphics;
+using osu.Game.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Online.API.Requests.Responses;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Allocation;
+using osu.Game.Graphics.Sprites;
+using osuTK.Graphics;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Input.Events;
+using osu.Game.Graphics.UserInterface;
+using System.Collections.Generic;
+using osuTK;
+using osu.Game.Online.API;
+using osu.Game.Online.API.Requests;
+using osu.Framework.Bindables;
+using System.Linq;
+
+namespace osu.Game.Overlays.Comments
+{
+    public class VotePill : LoadingButton, IHasAccentColour
+    {
+        private const int duration = 200;
+
+        public Color4 AccentColour { get; set; }
+
+        protected override IEnumerable<Drawable> EffectTargets => null;
+
+        [Resolved]
+        private IAPIProvider api { get; set; }
+
+        private readonly Comment comment;
+        private Box background;
+        private Box hoverLayer;
+        private CircularContainer borderContainer;
+        private SpriteText sideNumber;
+        private OsuSpriteText votesCounter;
+        private CommentVoteRequest request;
+
+        private readonly BindableBool isVoted = new BindableBool();
+        private readonly BindableInt votesCount = new BindableInt();
+
+        public VotePill(Comment comment)
+        {
+            this.comment = comment;
+
+            Action = onAction;
+
+            AutoSizeAxes = Axes.X;
+            Height = 20;
+            LoadingAnimationSize = new Vector2(10);
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            AccentColour = borderContainer.BorderColour = sideNumber.Colour = colours.GreenLight;
+            hoverLayer.Colour = Color4.Black.Opacity(0.5f);
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            isVoted.Value = comment.IsVoted;
+            votesCount.Value = comment.VotesCount;
+            isVoted.BindValueChanged(voted => background.Colour = voted.NewValue ? AccentColour : OsuColour.Gray(0.05f), true);
+            votesCount.BindValueChanged(count => votesCounter.Text = $"+{count.NewValue}", true);
+        }
+
+        private void onAction()
+        {
+            request = new CommentVoteRequest(comment.Id, isVoted.Value ? CommentVoteAction.UnVote : CommentVoteAction.Vote);
+            request.Success += onSuccess;
+            api.Queue(request);
+        }
+
+        private void onSuccess(CommentBundle response)
+        {
+            var receivedComment = response.Comments.Single();
+            isVoted.Value = receivedComment.IsVoted;
+            votesCount.Value = receivedComment.VotesCount;
+            IsLoading = false;
+        }
+
+        protected override Drawable CreateContent() => new Container
+        {
+            RelativeSizeAxes = Axes.Y,
+            AutoSizeAxes = Axes.X,
+            Children = new Drawable[]
+            {
+                borderContainer = new CircularContainer
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Masking = true,
+                    Children = new Drawable[]
+                    {
+                        background = new Box
+                        {
+                            RelativeSizeAxes = Axes.Both
+                        },
+                        hoverLayer = new Box
+                        {
+                            RelativeSizeAxes = Axes.Both,
+                            Alpha = 0
+                        }
+                    }
+                },
+                sideNumber = new SpriteText
+                {
+                    Anchor = Anchor.CentreLeft,
+                    Origin = Anchor.CentreRight,
+                    Text = "+1",
+                    Font = OsuFont.GetFont(size: 14),
+                    Margin = new MarginPadding { Right = 3 },
+                    Alpha = 0,
+                },
+                votesCounter = new OsuSpriteText
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Margin = new MarginPadding { Horizontal = 10 },
+                    Font = OsuFont.GetFont(size: 14),
+                    AlwaysPresent = true,
+                }
+            },
+        };
+
+        protected override void OnLoadStarted()
+        {
+            votesCounter.FadeOut(duration, Easing.OutQuint);
+            updateDisplay();
+        }
+
+        protected override void OnLoadFinished()
+        {
+            votesCounter.FadeIn(duration, Easing.OutQuint);
+
+            if (IsHovered)
+                onHoverAction();
+        }
+
+        protected override bool OnHover(HoverEvent e)
+        {
+            onHoverAction();
+            return base.OnHover(e);
+        }
+
+        protected override void OnHoverLost(HoverLostEvent e)
+        {
+            updateDisplay();
+            base.OnHoverLost(e);
+        }
+
+        private void updateDisplay()
+        {
+            if (isVoted.Value)
+            {
+                hoverLayer.FadeTo(IsHovered ? 1 : 0);
+                sideNumber.Hide();
+            }
+            else
+                sideNumber.FadeTo(IsHovered ? 1 : 0);
+
+            borderContainer.BorderThickness = IsHovered ? 3 : 0;
+        }
+
+        private void onHoverAction()
+        {
+            if (!IsLoading)
+                updateDisplay();
+        }
+
+        protected override void Dispose(bool isDisposing)
+        {
+            base.Dispose(isDisposing);
+            request?.Cancel();
+        }
+    }
+}

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

@@ -200,6 +200,7 @@ namespace osu.Game.Overlays.Settings.Sections.General
         {
             private TextBox username;
             private TextBox password;
+            private ShakeContainer shakeSignIn;
             private IAPIProvider api;
 
             public Action RequestHide;
@@ -208,6 +209,8 @@ namespace osu.Game.Overlays.Settings.Sections.General
             {
                 if (!string.IsNullOrEmpty(username.Text) && !string.IsNullOrEmpty(password.Text))
                     api.Login(username.Text, password.Text);
+                else
+                    shakeSignIn.Shake();
             }
 
             [BackgroundDependencyLoader(permitNulls: true)]
@@ -244,10 +247,23 @@ namespace osu.Game.Overlays.Settings.Sections.General
                         LabelText = "Stay signed in",
                         Bindable = config.GetBindable<bool>(OsuSetting.SavePassword),
                     },
-                    new SettingsButton
+                    new Container
                     {
-                        Text = "Sign in",
-                        Action = performLogin
+                        RelativeSizeAxes = Axes.X,
+                        AutoSizeAxes = Axes.Y,
+                        Children = new Drawable[]
+                        {
+                            shakeSignIn = new ShakeContainer
+                            {
+                                RelativeSizeAxes = Axes.X,
+                                AutoSizeAxes = Axes.Y,
+                                Child = new SettingsButton
+                                {
+                                    Text = "Sign in",
+                                    Action = performLogin
+                                },
+                            }
+                        }
                     },
                     new SettingsButton
                     {

osu.Game/Overlays/Settings/SettingsSlider.cs

@@ -8,12 +8,12 @@ using osu.Game.Graphics.UserInterface;
 namespace osu.Game.Overlays.Settings
 {
     public class SettingsSlider<T> : SettingsSlider<T, OsuSliderBar<T>>
-        where T : struct, IEquatable<T>, IComparable, IConvertible
+        where T : struct, IEquatable<T>, IComparable<T>, IConvertible
     {
     }
 
     public class SettingsSlider<T, U> : SettingsItem<T>
-        where T : struct, IEquatable<T>, IComparable, IConvertible
+        where T : struct, IEquatable<T>, IComparable<T>, IConvertible
         where U : OsuSliderBar<T>, new()
     {
         protected override Drawable CreateControl() => new U

osu.Game/Overlays/SettingsPanel.cs

@@ -37,7 +37,7 @@ namespace osu.Game.Overlays
 
         protected SettingsSectionsContainer SectionsContainer;
 
-        private SearchTextBox searchTextBox;
+        private SeekLimitedSearchTextBox searchTextBox;
 
         /// <summary>
         /// Provide a source for the toolbar height.
@@ -80,7 +80,7 @@ namespace osu.Game.Overlays
                         Masking = true,
                         RelativeSizeAxes = Axes.Both,
                         ExpandableHeader = CreateHeader(),
-                        FixedHeader = searchTextBox = new SearchTextBox
+                        FixedHeader = searchTextBox = new SeekLimitedSearchTextBox
                         {
                             RelativeSizeAxes = Axes.X,
                             Origin = Anchor.TopCentre,

osu.Game/Rulesets/Edit/HitObjectComposer.cs

@@ -4,14 +4,17 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using JetBrains.Annotations;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Input;
 using osu.Framework.Logging;
+using osu.Framework.Threading;
 using osu.Framework.Timing;
 using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Rulesets.Configuration;
 using osu.Game.Rulesets.Edit.Tools;
 using osu.Game.Rulesets.Mods;
@@ -22,6 +25,7 @@ using osu.Game.Screens.Edit;
 using osu.Game.Screens.Edit.Components.RadioButtons;
 using osu.Game.Screens.Edit.Compose;
 using osu.Game.Screens.Edit.Compose.Components;
+using osuTK;
 
 namespace osu.Game.Rulesets.Edit
 {
@@ -30,16 +34,23 @@ namespace osu.Game.Rulesets.Edit
         where TObject : HitObject
     {
         protected IRulesetConfigManager Config { get; private set; }
-
+        protected EditorBeatmap<TObject> EditorBeatmap { get; private set; }
         protected readonly Ruleset Ruleset;
 
+        [Resolved]
+        protected IFrameBasedClock EditorClock { get; private set; }
+
+        [Resolved]
+        private BindableBeatDivisor beatDivisor { get; set; }
+
         private IWorkingBeatmap workingBeatmap;
         private Beatmap<TObject> playableBeatmap;
-        private EditorBeatmap<TObject> editorBeatmap;
         private IBeatmapProcessor beatmapProcessor;
 
         private DrawableEditRulesetWrapper<TObject> drawableRulesetWrapper;
         private BlueprintContainer blueprintContainer;
+        private Container distanceSnapGridContainer;
+        private DistanceSnapGrid distanceSnapGrid;
         private readonly List<Container> layerContainers = new List<Container>();
 
         private InputManager inputManager;
@@ -67,11 +78,13 @@ namespace osu.Game.Rulesets.Edit
                 return;
             }
 
-            var layerBelowRuleset = drawableRulesetWrapper.CreatePlayfieldAdjustmentContainer();
-            layerBelowRuleset.Child = new EditorPlayfieldBorder { RelativeSizeAxes = Axes.Both };
+            var layerBelowRuleset = drawableRulesetWrapper.CreatePlayfieldAdjustmentContainer().WithChildren(new Drawable[]
+            {
+                distanceSnapGridContainer = new Container { RelativeSizeAxes = Axes.Both },
+                new EditorPlayfieldBorder { RelativeSizeAxes = Axes.Both }
+            });
 
-            var layerAboveRuleset = drawableRulesetWrapper.CreatePlayfieldAdjustmentContainer();
-            layerAboveRuleset.Child = blueprintContainer = new BlueprintContainer();
+            var layerAboveRuleset = drawableRulesetWrapper.CreatePlayfieldAdjustmentContainer().WithChild(blueprintContainer = new BlueprintContainer());
 
             layerContainers.Add(layerBelowRuleset);
             layerContainers.Add(layerAboveRuleset);
@@ -114,11 +127,13 @@ namespace osu.Game.Rulesets.Edit
             };
 
             toolboxCollection.Items =
-                CompositionTools.Select(t => new RadioButton(t.Name, () => blueprintContainer.CurrentTool = t))
-                                .Prepend(new RadioButton("Select", () => blueprintContainer.CurrentTool = null))
+                CompositionTools.Select(t => new RadioButton(t.Name, () => selectTool(t)))
+                                .Prepend(new RadioButton("Select", () => selectTool(null)))
                                 .ToList();
 
             toolboxCollection.Items[0].Select();
+
+            blueprintContainer.SelectionChanged += selectionChanged;
         }
 
         protected override IReadOnlyDependencyContainer CreateChildDependencies(IReadOnlyDependencyContainer parent)
@@ -130,14 +145,14 @@ namespace osu.Game.Rulesets.Edit
 
             beatmapProcessor = Ruleset.CreateBeatmapProcessor(playableBeatmap);
 
-            editorBeatmap = new EditorBeatmap<TObject>(playableBeatmap);
-            editorBeatmap.HitObjectAdded += addHitObject;
-            editorBeatmap.HitObjectRemoved += removeHitObject;
-            editorBeatmap.StartTimeChanged += updateHitObject;
+            EditorBeatmap = new EditorBeatmap<TObject>(playableBeatmap);
+            EditorBeatmap.HitObjectAdded += addHitObject;
+            EditorBeatmap.HitObjectRemoved += removeHitObject;
+            EditorBeatmap.StartTimeChanged += updateHitObject;
 
             var dependencies = new DependencyContainer(parent);
-            dependencies.CacheAs<IEditorBeatmap>(editorBeatmap);
-            dependencies.CacheAs<IEditorBeatmap<TObject>>(editorBeatmap);
+            dependencies.CacheAs<IEditorBeatmap>(EditorBeatmap);
+            dependencies.CacheAs<IEditorBeatmap<TObject>>(EditorBeatmap);
 
             Config = dependencies.Get<RulesetConfigCache>().GetConfigFor(Ruleset);
 
@@ -151,6 +166,16 @@ namespace osu.Game.Rulesets.Edit
             inputManager = GetContainingInputManager();
         }
 
+        private double lastGridUpdateTime;
+
+        protected override void Update()
+        {
+            base.Update();
+
+            if (EditorClock.CurrentTime != lastGridUpdateTime && blueprintContainer.CurrentTool != null)
+                showGridFor(Enumerable.Empty<HitObject>());
+        }
+
         protected override void UpdateAfterChildren()
         {
             base.UpdateAfterChildren();
@@ -164,19 +189,55 @@ namespace osu.Game.Rulesets.Edit
             });
         }
 
-        private void addHitObject(HitObject hitObject) => updateHitObject(hitObject);
-
-        private void removeHitObject(HitObject hitObject)
+        private void selectionChanged(IEnumerable<HitObject> selectedHitObjects)
         {
-            beatmapProcessor?.PreProcess();
-            beatmapProcessor?.PostProcess();
+            var hitObjects = selectedHitObjects.ToArray();
+
+            if (!hitObjects.Any())
+                distanceSnapGridContainer.Hide();
+            else
+                showGridFor(hitObjects);
         }
 
-        private void updateHitObject(HitObject hitObject)
+        private void selectTool(HitObjectCompositionTool tool)
         {
-            beatmapProcessor?.PreProcess();
-            hitObject.ApplyDefaults(playableBeatmap.ControlPointInfo, playableBeatmap.BeatmapInfo.BaseDifficulty);
-            beatmapProcessor?.PostProcess();
+            blueprintContainer.CurrentTool = tool;
+
+            if (tool == null)
+                distanceSnapGridContainer.Hide();
+            else
+                showGridFor(Enumerable.Empty<HitObject>());
+        }
+
+        private void showGridFor(IEnumerable<HitObject> selectedHitObjects)
+        {
+            distanceSnapGridContainer.Clear();
+            distanceSnapGrid = CreateDistanceSnapGrid(selectedHitObjects);
+
+            if (distanceSnapGrid != null)
+            {
+                distanceSnapGridContainer.Child = distanceSnapGrid;
+                distanceSnapGridContainer.Show();
+            }
+
+            lastGridUpdateTime = EditorClock.CurrentTime;
+        }
+
+        private ScheduledDelegate scheduledUpdate;
+
+        private void addHitObject(HitObject hitObject) => updateHitObject(hitObject);
+
+        private void removeHitObject(HitObject hitObject) => updateHitObject(null);
+
+        private void updateHitObject([CanBeNull] HitObject hitObject)
+        {
+            scheduledUpdate?.Cancel();
+            scheduledUpdate = Schedule(() =>
+            {
+                beatmapProcessor?.PreProcess();
+                hitObject?.ApplyDefaults(playableBeatmap.ControlPointInfo, playableBeatmap.BeatmapInfo.BaseDifficulty);
+                beatmapProcessor?.PostProcess();
+            });
         }
 
         public override IEnumerable<DrawableHitObject> HitObjects => drawableRulesetWrapper.Playfield.AllHitObjects;
@@ -188,26 +249,73 @@ namespace osu.Game.Rulesets.Edit
 
         public void BeginPlacement(HitObject hitObject)
         {
+            if (distanceSnapGrid != null)
+                hitObject.StartTime = GetSnappedPosition(distanceSnapGrid.ToLocalSpace(inputManager.CurrentState.Mouse.Position), hitObject.StartTime).time;
         }
 
-        public void EndPlacement(HitObject hitObject) => editorBeatmap.Add(hitObject);
+        public void EndPlacement(HitObject hitObject)
+        {
+            EditorBeatmap.Add(hitObject);
+            showGridFor(Enumerable.Empty<HitObject>());
+        }
 
-        public void Delete(HitObject hitObject) => editorBeatmap.Remove(hitObject);
+        public void Delete(HitObject hitObject) => EditorBeatmap.Remove(hitObject);
+
+        public override (Vector2 position, double time) GetSnappedPosition(Vector2 position, double time) => distanceSnapGrid?.GetSnappedPosition(position) ?? (position, time);
+
+        public override float GetBeatSnapDistanceAt(double referenceTime)
+        {
+            DifficultyControlPoint difficultyPoint = EditorBeatmap.ControlPointInfo.DifficultyPointAt(referenceTime);
+            return (float)(100 * EditorBeatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier * difficultyPoint.SpeedMultiplier / beatDivisor.Value);
+        }
+
+        public override float DurationToDistance(double referenceTime, double duration)
+        {
+            double beatLength = EditorBeatmap.ControlPointInfo.TimingPointAt(referenceTime).BeatLength / beatDivisor.Value;
+            return (float)(duration / beatLength * GetBeatSnapDistanceAt(referenceTime));
+        }
+
+        public override double DistanceToDuration(double referenceTime, float distance)
+        {
+            double beatLength = EditorBeatmap.ControlPointInfo.TimingPointAt(referenceTime).BeatLength / beatDivisor.Value;
+            return distance / GetBeatSnapDistanceAt(referenceTime) * beatLength;
+        }
+
+        public override double GetSnappedDurationFromDistance(double referenceTime, float distance)
+            => beatSnap(referenceTime, DistanceToDuration(referenceTime, distance));
+
+        public override float GetSnappedDistanceFromDistance(double referenceTime, float distance)
+            => DurationToDistance(referenceTime, beatSnap(referenceTime, DistanceToDuration(referenceTime, distance)));
+
+        /// <summary>
+        /// Snaps a duration to the closest beat of a timing point applicable at the reference time.
+        /// </summary>
+        /// <param name="referenceTime">The time of the timing point which <paramref name="duration"/> resides in.</param>
+        /// <param name="duration">The duration to snap.</param>
+        /// <returns>A value that represents <paramref name="duration"/> snapped to the closest beat of the timing point.</returns>
+        private double beatSnap(double referenceTime, double duration)
+        {
+            double beatLength = EditorBeatmap.ControlPointInfo.TimingPointAt(referenceTime).BeatLength / beatDivisor.Value;
+
+            // A 1ms offset prevents rounding errors due to minute variations in duration
+            return (int)((duration + 1) / beatLength) * beatLength;
+        }
 
         protected override void Dispose(bool isDisposing)
         {
             base.Dispose(isDisposing);
 
-            if (editorBeatmap != null)
+            if (EditorBeatmap != null)
             {
-                editorBeatmap.HitObjectAdded -= addHitObject;
-                editorBeatmap.HitObjectRemoved -= removeHitObject;
+                EditorBeatmap.HitObjectAdded -= addHitObject;
+                EditorBeatmap.HitObjectRemoved -= removeHitObject;
             }
         }
     }
 
     [Cached(typeof(HitObjectComposer))]
-    public abstract class HitObjectComposer : CompositeDrawable
+    [Cached(typeof(IDistanceSnapProvider))]
+    public abstract class HitObjectComposer : CompositeDrawable, IDistanceSnapProvider
     {
         internal HitObjectComposer()
         {
@@ -234,5 +342,20 @@ namespace osu.Game.Rulesets.Edit
         /// Creates a <see cref="SelectionHandler"/> which outlines <see cref="DrawableHitObject"/>s and handles movement of selections.
         /// </summary>
         public virtual SelectionHandler CreateSelectionHandler() => new SelectionHandler();
+
+        /// <summary>
+        /// Creates the <see cref="DistanceSnapGrid"/> applicable for a <see cref="HitObject"/> selection.
+        /// </summary>
+        /// <param name="selectedHitObjects">The <see cref="HitObject"/> selection.</param>
+        /// <returns>The <see cref="DistanceSnapGrid"/> for <paramref name="selectedHitObjects"/>.</returns>
+        [CanBeNull]
+        protected virtual DistanceSnapGrid CreateDistanceSnapGrid([NotNull] IEnumerable<HitObject> selectedHitObjects) => null;
+
+        public abstract (Vector2 position, double time) GetSnappedPosition(Vector2 position, double time);
+        public abstract float GetBeatSnapDistanceAt(double referenceTime);
+        public abstract float DurationToDistance(double referenceTime, double duration);
+        public abstract double DistanceToDuration(double referenceTime, float distance);
+        public abstract double GetSnappedDurationFromDistance(double referenceTime, float distance);
+        public abstract float GetSnappedDistanceFromDistance(double referenceTime, float distance);
     }
 }

osu.Game/Rulesets/Edit/IDistanceSnapProvider.cs

@@ -0,0 +1,51 @@
+// 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 osuTK;
+
+namespace osu.Game.Rulesets.Edit
+{
+    public interface IDistanceSnapProvider
+    {
+        (Vector2 position, double time) GetSnappedPosition(Vector2 position, double time);
+
+        /// <summary>
+        /// Retrieves the distance between two points within a timing point that are one beat length apart.
+        /// </summary>
+        /// <param name="referenceTime">The time of the timing point.</param>
+        /// <returns>The distance between two points residing in the timing point that are one beat length apart.</returns>
+        float GetBeatSnapDistanceAt(double referenceTime);
+
+        /// <summary>
+        /// Converts a duration to a distance.
+        /// </summary>
+        /// <param name="referenceTime">The time of the timing point which <paramref name="duration"/> resides in.</param>
+        /// <param name="duration">The duration to convert.</param>
+        /// <returns>A value that represents <paramref name="duration"/> as a distance in the timing point.</returns>
+        float DurationToDistance(double referenceTime, double duration);
+
+        /// <summary>
+        /// Converts a distance to a duration.
+        /// </summary>
+        /// <param name="referenceTime">The time of the timing point which <paramref name="distance"/> resides in.</param>
+        /// <param name="distance">The distance to convert.</param>
+        /// <returns>A value that represents <paramref name="distance"/> as a duration in the timing point.</returns>
+        double DistanceToDuration(double referenceTime, float distance);
+
+        /// <summary>
+        /// Converts a distance to a snapped duration.
+        /// </summary>
+        /// <param name="referenceTime">The time of the timing point which <paramref name="distance"/> resides in.</param>
+        /// <param name="distance">The distance to convert.</param>
+        /// <returns>A value that represents <paramref name="distance"/> as a duration snapped to the closest beat of the timing point.</returns>
+        double GetSnappedDurationFromDistance(double referenceTime, float distance);
+
+        /// <summary>
+        /// Converts an unsnapped distance to a snapped distance.
+        /// </summary>
+        /// <param name="referenceTime">The time of the timing point which <paramref name="distance"/> resides in.</param>
+        /// <param name="distance">The distance to convert.</param>
+        /// <returns>A value that represents <paramref name="distance"/> snapped to the closest beat of the timing point.</returns>
+        float GetSnappedDistanceFromDistance(double referenceTime, float distance);
+    }
+}