Merge branch 'master' into mod-fixes

osu.Game.Rulesets.Mania/Beatmaps/ManiaBeatmapConverter.cs

@@ -77,7 +77,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
                 yield break;
             }
 
-            var objects = IsForCurrentRuleset ? generateSpecific(original) : generateConverted(original);
+            var objects = IsForCurrentRuleset ? generateSpecific(original, beatmap) : generateConverted(original, beatmap);
 
             if (objects == null)
                 yield break;
@@ -110,10 +110,11 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
         /// Method that generates hit objects for osu!mania specific beatmaps.
         /// </summary>
         /// <param name="original">The original hit object.</param>
+        /// <param name="originalBeatmap">The original beatmap. This is used to look-up any values dependent on a fully-loaded beatmap.</param>
         /// <returns>The hit objects generated.</returns>
-        private IEnumerable<ManiaHitObject> generateSpecific(HitObject original)
+        private IEnumerable<ManiaHitObject> generateSpecific(HitObject original, Beatmap originalBeatmap)
         {
-            var generator = new SpecificBeatmapPatternGenerator(random, original, beatmap, lastPattern);
+            var generator = new SpecificBeatmapPatternGenerator(random, original, beatmap, lastPattern, originalBeatmap);
 
             Pattern newPattern = generator.Generate();
             lastPattern = newPattern;
@@ -125,26 +126,25 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
         /// Method that generates hit objects for non-osu!mania beatmaps.
         /// </summary>
         /// <param name="original">The original hit object.</param>
+        /// <param name="originalBeatmap">The original beatmap. This is used to look-up any values dependent on a fully-loaded beatmap.</param>
         /// <returns>The hit objects generated.</returns>
-        private IEnumerable<ManiaHitObject> generateConverted(HitObject original)
+        private IEnumerable<ManiaHitObject> generateConverted(HitObject original, Beatmap originalBeatmap)
         {
             var endTimeData = original as IHasEndTime;
             var distanceData = original as IHasDistance;
             var positionData = original as IHasPosition;
 
-            // Following lines currently commented out to appease resharper
-
             Patterns.PatternGenerator conversion = null;
 
             if (distanceData != null)
-                conversion = new DistanceObjectPatternGenerator(random, original, beatmap, lastPattern);
+                conversion = new DistanceObjectPatternGenerator(random, original, beatmap, lastPattern, originalBeatmap);
             else if (endTimeData != null)
-                conversion = new EndTimeObjectPatternGenerator(random, original, beatmap);
+                conversion = new EndTimeObjectPatternGenerator(random, original, beatmap, originalBeatmap);
             else if (positionData != null)
             {
                 computeDensity(original.StartTime);
 
-                conversion = new HitObjectPatternGenerator(random, original, beatmap, lastPattern, lastTime, lastPosition, density, lastStair);
+                conversion = new HitObjectPatternGenerator(random, original, beatmap, lastPattern, lastTime, lastPosition, density, lastStair, originalBeatmap);
 
                 recordNote(original.StartTime, positionData.Position);
             }
@@ -153,10 +153,9 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
                 return null;
 
             Pattern newPattern = conversion.Generate();
-            lastPattern = newPattern;
 
-            var stairPatternGenerator = conversion as HitObjectPatternGenerator;
+            lastPattern = conversion is EndTimeObjectPatternGenerator ? lastPattern : newPattern;
-            lastStair = stairPatternGenerator?.StairType ?? lastStair;
+            lastStair = (conversion as HitObjectPatternGenerator)?.StairType ?? lastStair;
 
             return newPattern.HitObjects;
         }
@@ -166,8 +165,8 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
         /// </summary>
         private class SpecificBeatmapPatternGenerator : Patterns.Legacy.PatternGenerator
         {
-            public SpecificBeatmapPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern)
+            public SpecificBeatmapPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, Beatmap originalBeatmap)
-                : base(random, hitObject, beatmap, previousPattern)
+                : base(random, hitObject, beatmap, previousPattern, originalBeatmap)
             {
             }
 

osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/DistanceObjectPatternGenerator.cs

@@ -5,6 +5,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using osu.Game.Audio;
+using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Mania.MathUtils;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Types;
@@ -29,11 +30,11 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 
         private PatternType convertType;
 
-        public DistanceObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern)
+        public DistanceObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, Beatmap originalBeatmap)
-            : base(random, hitObject, beatmap, previousPattern)
+            : base(random, hitObject, beatmap, previousPattern, originalBeatmap)
         {
             convertType = PatternType.None;
-            if (Beatmap.ControlPointInfo.EffectPointAt(hitObject.StartTime).KiaiMode)
+            if (!Beatmap.ControlPointInfo.EffectPointAt(hitObject.StartTime).KiaiMode)
                 convertType = PatternType.LowProbability;
 
             var distanceData = hitObject as IHasDistance;
@@ -305,19 +306,19 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
                     p4 = 0;
                     break;
                 case 3:
-                    p2 = Math.Max(p2, 0.1);
+                    p2 = Math.Min(p2, 0.1);
                     p3 = 0;
                     p4 = 0;
                     break;
                 case 4:
-                    p2 = Math.Max(p2, 0.3);
+                    p2 = Math.Min(p2, 0.3);
-                    p3 = Math.Max(p3, 0.04);
+                    p3 = Math.Min(p3, 0.04);
                     p4 = 0;
                     break;
                 case 5:
-                    p2 = Math.Max(p2, 0.34);
+                    p2 = Math.Min(p2, 0.34);
-                    p3 = Math.Max(p3, 0.1);
+                    p3 = Math.Min(p3, 0.1);
-                    p4 = Math.Max(p4, 0.03);
+                    p4 = Math.Min(p4, 0.03);
                     break;
             }
 
@@ -396,17 +397,19 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
             // Create the hold note
             addToPattern(pattern, holdColumn, startTime, endTime);
 
-            int noteCount = 1;
+            int nextColumn = Random.Next(RandomStart, TotalColumns);
+            int noteCount;
             if (ConversionDifficulty > 6.5)
                 noteCount = GetRandomNoteCount(0.63, 0);
             else if (ConversionDifficulty > 4)
                 noteCount = GetRandomNoteCount(TotalColumns < 6 ? 0.12 : 0.45, 0);
             else if (ConversionDifficulty > 2.5)
                 noteCount = GetRandomNoteCount(TotalColumns < 6 ? 0 : 0.24, 0);
+            else
+                noteCount = 0;
             noteCount = Math.Min(TotalColumns - 1, noteCount);
 
             bool ignoreHead = !sampleInfoListAt(startTime).Any(s => s.Name == SampleInfo.HIT_WHISTLE || s.Name == SampleInfo.HIT_FINISH || s.Name == SampleInfo.HIT_CLAP);
-            int nextColumn = Random.Next(RandomStart, TotalColumns);
 
             var rowPattern = new Pattern();
             for (int i = 0; i <= spanCount; i++)

osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/EndTimeObjectPatternGenerator.cs

@@ -7,6 +7,7 @@ using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Types;
 using System.Linq;
 using osu.Game.Audio;
+using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Mania.Objects;
 
 namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
@@ -15,8 +16,8 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
     {
         private readonly double endTime;
 
-        public EndTimeObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap)
+        public EndTimeObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Beatmap originalBeatmap)
-            : base(random, hitObject, beatmap, new Pattern())
+            : base(random, hitObject, beatmap, new Pattern(), originalBeatmap)
         {
             var endtimeData = HitObject as IHasEndTime;
 

osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs

@@ -5,6 +5,7 @@ using System;
 using System.Linq;
 using OpenTK;
 using osu.Game.Audio;
+using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Rulesets.Mania.MathUtils;
 using osu.Game.Rulesets.Mania.Objects;
@@ -19,8 +20,8 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 
         private readonly PatternType convertType;
 
-        public HitObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, double previousTime, Vector2 previousPosition, double density, PatternType lastStair)
+        public HitObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, double previousTime, Vector2 previousPosition, double density, PatternType lastStair, Beatmap originalBeatmap)
-            : base(random, hitObject, beatmap, previousPattern)
+            : base(random, hitObject, beatmap, previousPattern, originalBeatmap)
         {
             if (previousTime > hitObject.StartTime) throw new ArgumentOutOfRangeException(nameof(previousTime));
             if (density < 0) throw new ArgumentOutOfRangeException(nameof(density));
@@ -308,20 +309,20 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
                     p5 = 0;
                     break;
                 case 3:
-                    p2 = Math.Max(p2, 0.1);
+                    p2 = Math.Min(p2, 0.1);
                     p3 = 0;
                     p4 = 0;
                     p5 = 0;
                     break;
                 case 4:
-                    p2 = Math.Max(p2, 0.23);
+                    p2 = Math.Min(p2, 0.23);
-                    p3 = Math.Max(p3, 0.04);
+                    p3 = Math.Min(p3, 0.04);
                     p4 = 0;
                     p5 = 0;
                     break;
                 case 5:
-                    p3 = Math.Max(p3, 0.15);
+                    p3 = Math.Min(p3, 0.15);
-                    p4 = Math.Max(p4, 0.03);
+                    p4 = Math.Min(p4, 0.03);
                     p5 = 0;
                     break;
             }
@@ -355,23 +356,23 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
                     p3 = 0;
                     break;
                 case 3:
-                    centreProbability = Math.Max(centreProbability, 0.03);
+                    centreProbability = Math.Min(centreProbability, 0.03);
-                    p2 = Math.Max(p2, 0.1);
+                    p2 = 0;
                     p3 = 0;
                     break;
                 case 4:
                     centreProbability = 0;
-                    p2 = Math.Max(p2 * 2, 0.2);
+                    p2 = Math.Min(p2 * 2, 0.2);
                     p3 = 0;
                     break;
                 case 5:
-                    centreProbability = Math.Max(centreProbability, 0.03);
+                    centreProbability = Math.Min(centreProbability, 0.03);
                     p3 = 0;
                     break;
                 case 6:
                     centreProbability = 0;
-                    p2 = Math.Max(p2 * 2, 0.5);
+                    p2 = Math.Min(p2 * 2, 0.5);
-                    p3 = Math.Max(p3 * 2, 0.15);
+                    p3 = Math.Min(p3 * 2, 0.15);
                     break;
             }
 

osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/PatternGenerator.cs

@@ -25,14 +25,20 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// </summary>
         protected readonly FastRandom Random;
 
-        protected PatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern)
+        /// <summary>
+        /// The beatmap which <see cref="HitObject"/> is being converted from.
+        /// </summary>
+        protected readonly Beatmap OriginalBeatmap;
+
+        protected PatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, Beatmap originalBeatmap)
             : base(hitObject, beatmap, previousPattern)
         {
             if (random == null) throw new ArgumentNullException(nameof(random));
-            if (beatmap == null) throw new ArgumentNullException(nameof(beatmap));
+            if (originalBeatmap == null) throw new ArgumentNullException(nameof(originalBeatmap));
-            if (previousPattern == null) throw new ArgumentNullException(nameof(previousPattern));
 
             Random = random;
+            OriginalBeatmap = originalBeatmap;
+
             RandomStart = TotalColumns == 8 ? 1 : 0;
         }
 
@@ -94,17 +100,20 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
                 if (conversionDifficulty != null)
                     return conversionDifficulty.Value;
 
-                HitObject lastObject = Beatmap.HitObjects.LastOrDefault();
+                HitObject lastObject = OriginalBeatmap.HitObjects.LastOrDefault();
-                HitObject firstObject = Beatmap.HitObjects.FirstOrDefault();
+                HitObject firstObject = OriginalBeatmap.HitObjects.FirstOrDefault();
 
                 double drainTime = (lastObject?.StartTime ?? 0) - (firstObject?.StartTime ?? 0);
-                drainTime -= Beatmap.TotalBreakTime;
+                drainTime -= OriginalBeatmap.TotalBreakTime;
 
                 if (drainTime == 0)
-                    drainTime = 10000;
+                    drainTime = 10000000;
 
-                BeatmapDifficulty difficulty = Beatmap.BeatmapInfo.BaseDifficulty;
+                // We need this in seconds
-                conversionDifficulty = ((difficulty.DrainRate + MathHelper.Clamp(difficulty.ApproachRate, 4, 7)) / 1.5 + Beatmap.HitObjects.Count / drainTime * 9f) / 38f * 5f / 1.15;
+                drainTime /= 1000;
+
+                BeatmapDifficulty difficulty = OriginalBeatmap.BeatmapInfo.BaseDifficulty;
+                conversionDifficulty = ((difficulty.DrainRate + MathHelper.Clamp(difficulty.ApproachRate, 4, 7)) / 1.5 + OriginalBeatmap.HitObjects.Count / drainTime * 9f) / 38f * 5f / 1.15;
                 conversionDifficulty = Math.Min(conversionDifficulty.Value, 12);
 
                 return conversionDifficulty.Value;

osu.Game.Rulesets.Mania/Tests/ManiaBeatmapConversionTest.cs

@@ -21,7 +21,7 @@ namespace osu.Game.Rulesets.Mania.Tests
         private bool isForCurrentRuleset;
 
         [NonParallelizable]
-        [TestCase("basic", false), Ignore("See: https://github.com/ppy/osu/issues/2150")]
+        [TestCase("basic", false)]
         public void Test(string name, bool isForCurrentRuleset)
         {
             this.isForCurrentRuleset = isForCurrentRuleset;

osu.Game.Rulesets.Osu/Edit/Layers/Selection/OsuHitObjectOverlayLayer.cs

@@ -1,26 +0,0 @@
-// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
-// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
-
-using osu.Game.Rulesets.Edit.Layers.Selection;
-using osu.Game.Rulesets.Objects.Drawables;
-using osu.Game.Rulesets.Osu.Edit.Layers.Selection.Overlays;
-using osu.Game.Rulesets.Osu.Objects.Drawables;
-
-namespace osu.Game.Rulesets.Osu.Edit.Layers.Selection
-{
-    public class OsuHitObjectOverlayLayer : HitObjectOverlayLayer
-    {
-        protected override HitObjectOverlay CreateOverlayFor(DrawableHitObject hitObject)
-        {
-            switch (hitObject)
-            {
-                case DrawableHitCircle circle:
-                    return new HitCircleOverlay(circle);
-                case DrawableSlider slider:
-                    return new SliderOverlay(slider);
-            }
-
-            return base.CreateOverlayFor(hitObject);
-        }
-    }
-}

osu.Game.Rulesets.Osu/Edit/Layers/Selection/Overlays/HitCircleMask.cs

@@ -4,15 +4,15 @@
 using osu.Framework.Graphics;
 using osu.Framework.Allocation;
 using osu.Game.Graphics;
-using osu.Game.Rulesets.Edit.Layers.Selection;
+using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Osu.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Objects.Drawables.Pieces;
 
 namespace osu.Game.Rulesets.Osu.Edit.Layers.Selection.Overlays
 {
-    public class HitCircleOverlay : HitObjectOverlay
+    public class HitCircleMask : HitObjectMask
     {
-        public HitCircleOverlay(DrawableHitCircle hitCircle)
+        public HitCircleMask(DrawableHitCircle hitCircle)
             : base(hitCircle)
         {
             Origin = Anchor.Centre;
@@ -22,6 +22,8 @@ namespace osu.Game.Rulesets.Osu.Edit.Layers.Selection.Overlays
             Scale = hitCircle.Scale;
 
             AddInternal(new RingPiece());
+
+            hitCircle.HitObject.PositionChanged += _ => Position = hitCircle.Position;
         }
 
         [BackgroundDependencyLoader]

osu.Game.Rulesets.Osu/Edit/Layers/Selection/Overlays/SliderCircleMask.cs

@@ -4,7 +4,7 @@
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Game.Graphics;
-using osu.Game.Rulesets.Edit.Layers.Selection;
+using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.Osu.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Objects.Drawables.Pieces;
@@ -12,21 +12,21 @@ using OpenTK;
 
 namespace osu.Game.Rulesets.Osu.Edit.Layers.Selection.Overlays
 {
-    public class SliderCircleOverlay : HitObjectOverlay
+    public class SliderCircleMask : HitObjectMask
     {
-        public SliderCircleOverlay(DrawableHitCircle sliderHead, DrawableSlider slider)
+        public SliderCircleMask(DrawableHitCircle sliderHead, DrawableSlider slider)
             : this(sliderHead, Vector2.Zero, slider)
         {
         }
 
-        public SliderCircleOverlay(DrawableSliderTail sliderTail, DrawableSlider slider)
+        public SliderCircleMask(DrawableSliderTail sliderTail, DrawableSlider slider)
             : this(sliderTail, ((Slider)slider.HitObject).Curve.PositionAt(1), slider)
         {
         }
 
         private readonly DrawableOsuHitObject hitObject;
 
-        private SliderCircleOverlay(DrawableOsuHitObject hitObject, Vector2 position, DrawableSlider slider)
+        private SliderCircleMask(DrawableOsuHitObject hitObject, Vector2 position, DrawableSlider slider)
             : base(hitObject)
         {
             this.hitObject = hitObject;

osu.Game.Rulesets.Osu/Edit/Layers/Selection/Overlays/SliderMask.cs

@@ -4,36 +4,41 @@
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Game.Graphics;
-using osu.Game.Rulesets.Edit.Layers.Selection;
+using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Osu.Objects;
 using osu.Game.Rulesets.Osu.Objects.Drawables;
 using osu.Game.Rulesets.Osu.Objects.Drawables.Pieces;
+using OpenTK;
 using OpenTK.Graphics;
 
 namespace osu.Game.Rulesets.Osu.Edit.Layers.Selection.Overlays
 {
-    public class SliderOverlay : HitObjectOverlay
+    public class SliderMask : HitObjectMask
     {
         private readonly SliderBody body;
         private readonly DrawableSlider slider;
 
-        public SliderOverlay(DrawableSlider slider)
+        public SliderMask(DrawableSlider slider)
             : base(slider)
         {
             this.slider = slider;
 
-            var obj = (Slider)slider.HitObject;
+            Position = slider.Position;
+
+            var sliderObject = (Slider)slider.HitObject;
 
             InternalChildren = new Drawable[]
             {
-                body = new SliderBody(obj)
+                body = new SliderBody(sliderObject)
                 {
                     AccentColour = Color4.Transparent,
-                    PathWidth = obj.Scale * 64
+                    PathWidth = sliderObject.Scale * 64
                 },
-                new SliderCircleOverlay(slider.HeadCircle, slider),
+                new SliderCircleMask(slider.HeadCircle, slider),
-                new SliderCircleOverlay(slider.TailCircle, slider),
+                new SliderCircleMask(slider.TailCircle, slider),
             };
+
+            sliderObject.PositionChanged += _ => Position = slider.Position;
         }
 
         [BackgroundDependencyLoader]
@@ -46,12 +51,13 @@ namespace osu.Game.Rulesets.Osu.Edit.Layers.Selection.Overlays
         {
             base.Update();
 
-            Position = slider.Position;
             Size = slider.Size;
             OriginPosition = slider.OriginPosition;
 
             // Need to cause one update
             body.UpdateProgress(0);
         }
+
+        public override bool ReceiveMouseInputAt(Vector2 screenSpacePos) => body.ReceiveMouseInputAt(screenSpacePos);
     }
 }

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

@@ -5,10 +5,11 @@ using System.Collections.Generic;
 using osu.Framework.Graphics;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Edit;
-using osu.Game.Rulesets.Edit.Layers.Selection;
 using osu.Game.Rulesets.Edit.Tools;
-using osu.Game.Rulesets.Osu.Edit.Layers.Selection;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Rulesets.Osu.Edit.Layers.Selection.Overlays;
 using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Objects.Drawables;
 using osu.Game.Rulesets.Osu.UI;
 using osu.Game.Rulesets.UI;
 
@@ -32,6 +33,17 @@ namespace osu.Game.Rulesets.Osu.Edit
 
         protected override ScalableContainer CreateLayerContainer() => new ScalableContainer(OsuPlayfield.BASE_SIZE.X) { RelativeSizeAxes = Axes.Both };
 
-        protected override HitObjectOverlayLayer CreateHitObjectOverlayLayer() => new OsuHitObjectOverlayLayer();
+        public override HitObjectMask CreateMaskFor(DrawableHitObject hitObject)
+        {
+            switch (hitObject)
+            {
+                case DrawableHitCircle circle:
+                    return new HitCircleMask(circle);
+                case DrawableSlider slider:
+                    return new SliderMask(slider);
+            }
+
+            return base.CreateMaskFor(hitObject);
+        }
     }
 }

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

@@ -66,6 +66,8 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
 
             //may not be so correct
             Size = circle.DrawSize;
+
+            HitObject.PositionChanged += _ => Position = HitObject.StackedPosition;
         }
 
         protected override void CheckForJudgements(bool userTriggered, double timeOffset)

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

@@ -83,6 +83,8 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
                 components.Add(drawableRepeatPoint);
                 AddNested(drawableRepeatPoint);
             }
+
+            HitObject.PositionChanged += _ => Position = HitObject.StackedPosition;
         }
 
         [BackgroundDependencyLoader]

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

@@ -1,23 +1,41 @@
 // Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
+using System;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Objects;
 using OpenTK;
 using osu.Game.Rulesets.Objects.Types;
 using OpenTK.Graphics;
 using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Edit.Types;
 
 namespace osu.Game.Rulesets.Osu.Objects
 {
-    public abstract class OsuHitObject : HitObject, IHasCombo, IHasPosition
+    public abstract class OsuHitObject : HitObject, IHasCombo, IHasEditablePosition
     {
         public const double OBJECT_RADIUS = 64;
 
+        public event Action<Vector2> PositionChanged;
+
         public double TimePreempt = 600;
         public double TimeFadein = 400;
 
-        public Vector2 Position { get; set; }
+        private Vector2 position;
+
+        public Vector2 Position
+        {
+            get => position;
+            set
+            {
+                if (position == value)
+                    return;
+                position = value;
+
+                PositionChanged?.Invoke(value);
+            }
+        }
+
         public float X => Position.X;
         public float Y => Position.Y;
 
@@ -48,5 +66,7 @@ namespace osu.Game.Rulesets.Osu.Objects
 
             Scale = (1.0f - 0.7f * (difficulty.CircleSize - 5) / 5) / 2;
         }
+
+        public virtual void OffsetPosition(Vector2 offset) => Position += offset;
     }
 }

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

@@ -95,7 +95,7 @@ namespace osu.Game.Rulesets.Osu.Objects
 
         private void createSliderEnds()
         {
-            HeadCircle = new HitCircle
+            HeadCircle = new SliderCircle(this)
             {
                 StartTime = StartTime,
                 Position = Position,
@@ -105,7 +105,7 @@ namespace osu.Game.Rulesets.Osu.Objects
                 SampleControlPoint = SampleControlPoint
             };
 
-            TailCircle = new HitCircle
+            TailCircle = new SliderCircle(this)
             {
                 StartTime = EndTime,
                 Position = EndPosition,

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

@@ -0,0 +1,19 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using OpenTK;
+
+namespace osu.Game.Rulesets.Osu.Objects
+{
+    public class SliderCircle : HitCircle
+    {
+        private readonly Slider slider;
+
+        public SliderCircle(Slider slider)
+        {
+            this.slider = slider;
+        }
+
+        public override void OffsetPosition(Vector2 offset) => slider.OffsetPosition(offset);
+    }
+}

osu.Game.Rulesets.Osu/osu.Game.Rulesets.Osu.csproj

@@ -64,10 +64,9 @@
   <ItemGroup>
     <Compile Include="Beatmaps\OsuBeatmapConverter.cs" />
     <Compile Include="Beatmaps\OsuBeatmapProcessor.cs" />
-    <Compile Include="Edit\Layers\Selection\OsuHitObjectOverlayLayer.cs" />
+    <Compile Include="Edit\Layers\Selection\Overlays\HitCircleMask.cs" />
-    <Compile Include="Edit\Layers\Selection\Overlays\HitCircleOverlay.cs" />
+    <Compile Include="Edit\Layers\Selection\Overlays\SliderCircleMask.cs" />
-    <Compile Include="Edit\Layers\Selection\Overlays\SliderCircleOverlay.cs" />
+    <Compile Include="Edit\Layers\Selection\Overlays\SliderMask.cs" />
-    <Compile Include="Edit\Layers\Selection\Overlays\SliderOverlay.cs" />
     <Compile Include="Edit\OsuEditPlayfield.cs" />
     <Compile Include="Edit\OsuEditRulesetContainer.cs" />
     <Compile Include="Edit\OsuHitObjectComposer.cs" />
@@ -118,6 +117,7 @@
     <Compile Include="Objects\Drawables\Pieces\SliderBody.cs" />
     <Compile Include="Objects\ISliderProgress.cs" />
     <Compile Include="Objects\RepeatPoint.cs" />
+    <Compile Include="Objects\SliderCircle.cs" />
     <Compile Include="Objects\SliderTick.cs" />
     <Compile Include="OsuDifficulty\OsuDifficultyCalculator.cs" />
     <Compile Include="OsuDifficulty\Preprocessing\OsuDifficultyBeatmap.cs" />

osu.Game.Tests/Visual/TestCaseEditorSelectionLayer.cs

@@ -8,13 +8,12 @@ using osu.Framework.Allocation;
 using OpenTK;
 using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Edit;
-using osu.Game.Rulesets.Edit.Layers.Selection;
 using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Osu;
 using osu.Game.Rulesets.Osu.Edit;
-using osu.Game.Rulesets.Osu.Edit.Layers.Selection;
 using osu.Game.Rulesets.Osu.Edit.Layers.Selection.Overlays;
 using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Screens.Edit.Screens.Compose.Layers;
 using osu.Game.Tests.Beatmaps;
 
 namespace osu.Game.Tests.Visual
@@ -24,17 +23,15 @@ namespace osu.Game.Tests.Visual
     {
         public override IReadOnlyList<Type> RequiredTypes => new[]
         {
-            typeof(SelectionBox),
             typeof(SelectionLayer),
-            typeof(CaptureBox),
+            typeof(SelectionBox),
             typeof(HitObjectComposer),
             typeof(OsuHitObjectComposer),
-            typeof(HitObjectOverlayLayer),
+            typeof(HitObjectMaskLayer),
-            typeof(OsuHitObjectOverlayLayer),
+            typeof(HitObjectMask),
-            typeof(HitObjectOverlay),
+            typeof(HitCircleMask),
-            typeof(HitCircleOverlay),
+            typeof(SliderMask),
-            typeof(SliderOverlay),
+            typeof(SliderCircleMask)
-            typeof(SliderCircleOverlay)
         };
 
         [BackgroundDependencyLoader]

osu.Game/Rulesets/Edit/HitObjectComposer.cs

@@ -10,10 +10,10 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Logging;
 using osu.Framework.Timing;
 using osu.Game.Beatmaps;
-using osu.Game.Rulesets.Edit.Layers;
-using osu.Game.Rulesets.Edit.Layers.Selection;
 using osu.Game.Rulesets.Edit.Tools;
+using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.UI;
+using osu.Game.Screens.Edit.Screens.Compose.Layers;
 using osu.Game.Screens.Edit.Screens.Compose.RadioButtons;
 
 namespace osu.Game.Rulesets.Edit
@@ -49,7 +49,7 @@ namespace osu.Game.Rulesets.Edit
                 return;
             }
 
-            HitObjectOverlayLayer hitObjectOverlayLayer = CreateHitObjectOverlayLayer();
+            HitObjectMaskLayer hitObjectMaskLayer = new HitObjectMaskLayer(this);
             SelectionLayer selectionLayer = new SelectionLayer(rulesetContainer.Playfield);
 
             var layerBelowRuleset = new BorderLayer
@@ -62,7 +62,7 @@ namespace osu.Game.Rulesets.Edit
             layerAboveRuleset.Children = new Drawable[]
             {
                 selectionLayer, // Below object overlays for input
-                hitObjectOverlayLayer,
+                hitObjectMaskLayer,
                 selectionLayer.CreateProxy() // Proxy above object overlays for selections
             };
 
@@ -106,8 +106,10 @@ namespace osu.Game.Rulesets.Edit
                 }
             };
 
-            selectionLayer.ObjectSelected += hitObjectOverlayLayer.AddOverlay;
+            selectionLayer.ObjectSelected += hitObjectMaskLayer.AddOverlay;
-            selectionLayer.ObjectDeselected += hitObjectOverlayLayer.RemoveOverlay;
+            selectionLayer.ObjectDeselected += hitObjectMaskLayer.RemoveOverlay;
+            selectionLayer.SelectionCleared += hitObjectMaskLayer.RemoveSelectionOverlay;
+            selectionLayer.SelectionFinished += hitObjectMaskLayer.AddSelectionOverlay;
 
             toolboxCollection.Items =
                 new[] { new RadioButton("Select", () => setCompositionTool(null)) }
@@ -138,14 +140,22 @@ namespace osu.Game.Rulesets.Edit
 
         protected abstract IReadOnlyList<ICompositionTool> CompositionTools { get; }
 
+        /// <summary>
+        /// Creates a <see cref="HitObjectMask"/> for a specific <see cref="DrawableHitObject"/>.
+        /// </summary>
+        /// <param name="hitObject">The <see cref="DrawableHitObject"/> to create the overlay for.</param>
+        public virtual HitObjectMask CreateMaskFor(DrawableHitObject hitObject) => null;
+
+        /// <summary>
+        /// Creates a <see cref="SelectionBox"/> which outlines <see cref="DrawableHitObject"/>s
+        /// and handles all hitobject movement/pattern adjustments.
+        /// </summary>
+        /// <param name="overlays">The <see cref="DrawableHitObject"/> overlays.</param>
+        public virtual SelectionBox CreateSelectionOverlay(IReadOnlyList<HitObjectMask> overlays) => new SelectionBox(overlays);
+
         /// <summary>
         /// Creates a <see cref="ScalableContainer"/> which provides a layer above or below the <see cref="Playfield"/>.
         /// </summary>
         protected virtual ScalableContainer CreateLayerContainer() => new ScalableContainer { RelativeSizeAxes = Axes.Both };
-
-        /// <summary>
-        /// Creates the <see cref="HitObjectOverlayLayer"/> which overlays selected <see cref="DrawableHitObject"/>s.
-        /// </summary>
-        protected virtual HitObjectOverlayLayer CreateHitObjectOverlayLayer() => new HitObjectOverlayLayer();
     }
 }

osu.Game/Rulesets/Edit/HitObjectMask.cs

@@ -0,0 +1,21 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.Graphics.Containers;
+using osu.Game.Rulesets.Objects.Drawables;
+
+namespace osu.Game.Rulesets.Edit
+{
+    /// <summary>
+    /// A mask placed above a <see cref="DrawableHitObject"/> adding editing functionality.
+    /// </summary>
+    public class HitObjectMask : Container
+    {
+        public readonly DrawableHitObject HitObject;
+
+        public HitObjectMask(DrawableHitObject hitObject)
+        {
+            HitObject = hitObject;
+        }
+    }
+}

osu.Game/Rulesets/Edit/Layers/Selection/CaptureBox.cs

@@ -1,68 +0,0 @@
-// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
-// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
-
-using System.Collections.Generic;
-using osu.Framework.Allocation;
-using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Shapes;
-using osu.Game.Graphics;
-using osu.Game.Rulesets.Objects.Drawables;
-using OpenTK;
-
-namespace osu.Game.Rulesets.Edit.Layers.Selection
-{
-    /// <summary>
-    /// A box which encloses <see cref="DrawableHitObject"/>s.
-    /// </summary>
-    public class CaptureBox : VisibilityContainer
-    {
-        private readonly IDrawable captureArea;
-        private readonly IReadOnlyList<DrawableHitObject> capturedObjects;
-
-        public CaptureBox(IDrawable captureArea, IReadOnlyList<DrawableHitObject> capturedObjects)
-        {
-            this.captureArea = captureArea;
-            this.capturedObjects = capturedObjects;
-
-            Masking = true;
-            BorderThickness = SelectionBox.BORDER_RADIUS;
-
-            InternalChild = new Box
-            {
-                RelativeSizeAxes = Axes.Both,
-                AlwaysPresent = true,
-                Alpha = 0
-            };
-
-            State = Visibility.Visible;
-        }
-
-        [BackgroundDependencyLoader]
-        private void load(OsuColour colours)
-        {
-            BorderColour = colours.Yellow;
-
-            // Move the rectangle to cover the hitobjects
-            var topLeft = new Vector2(float.MaxValue, float.MaxValue);
-            var bottomRight = new Vector2(float.MinValue, float.MinValue);
-
-            foreach (var obj in capturedObjects)
-            {
-                topLeft = Vector2.ComponentMin(topLeft, captureArea.ToLocalSpace(obj.SelectionQuad.TopLeft));
-                bottomRight = Vector2.ComponentMax(bottomRight, captureArea.ToLocalSpace(obj.SelectionQuad.BottomRight));
-            }
-
-            topLeft -= new Vector2(5);
-            bottomRight += new Vector2(5);
-
-            Size = bottomRight - topLeft;
-            Position = topLeft;
-        }
-
-        public override bool DisposeOnDeathRemoval => true;
-
-        protected override void PopIn() => this.FadeIn();
-        protected override void PopOut() => this.FadeOut();
-    }
-}

osu.Game/Rulesets/Edit/Layers/Selection/HitObjectOverlay.cs

@@ -1,25 +0,0 @@
-// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
-// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
-
-using osu.Framework.Graphics.Containers;
-using osu.Game.Rulesets.Objects.Drawables;
-
-namespace osu.Game.Rulesets.Edit.Layers.Selection
-{
-    public class HitObjectOverlay : OverlayContainer
-    {
-        // ReSharper disable once NotAccessedField.Local
-        // This will be used later to handle drag movement, etc
-        private readonly DrawableHitObject hitObject;
-
-        public HitObjectOverlay(DrawableHitObject hitObject)
-        {
-            this.hitObject = hitObject;
-
-            State = Visibility.Visible;
-        }
-
-        protected override void PopIn() => Alpha = 1;
-        protected override void PopOut() => Alpha = 0;
-    }
-}

osu.Game/Rulesets/Edit/Layers/Selection/SelectionBox.cs

@@ -1,49 +0,0 @@
-// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
-// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
-
-using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Primitives;
-using osu.Framework.Graphics.Shapes;
-using OpenTK.Graphics;
-
-namespace osu.Game.Rulesets.Edit.Layers.Selection
-{
-    /// <summary>
-    /// A box that represents a drag selection.
-    /// </summary>
-    public class SelectionBox : VisibilityContainer
-    {
-        public const float BORDER_RADIUS = 2;
-
-        /// <summary>
-        /// Creates a new <see cref="SelectionBox"/>.
-        /// </summary>
-        public SelectionBox()
-        {
-            Masking = true;
-            BorderColour = Color4.White;
-            BorderThickness = BORDER_RADIUS;
-
-            Child = new Box
-            {
-                RelativeSizeAxes = Axes.Both,
-                Alpha = 0.1f
-            };
-        }
-
-        public void SetDragRectangle(RectangleF rectangle)
-        {
-            var topLeft = Parent.ToLocalSpace(rectangle.TopLeft);
-            var bottomRight = Parent.ToLocalSpace(rectangle.BottomRight);
-
-            Position = topLeft;
-            Size = bottomRight - topLeft;
-        }
-
-        public override bool DisposeOnDeathRemoval => true;
-
-        protected override void PopIn() => this.FadeIn(250, Easing.OutQuint);
-        protected override void PopOut() => this.FadeOut(250, Easing.OutQuint);
-    }
-}

osu.Game/Rulesets/Edit/Types/IHasEditablePosition.cs

@@ -0,0 +1,13 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Game.Rulesets.Objects.Types;
+using OpenTK;
+
+namespace osu.Game.Rulesets.Edit.Types
+{
+    public interface IHasEditablePosition : IHasPosition
+    {
+        void OffsetPosition(Vector2 offset);
+    }
+}

osu.Game/Screens/Edit/Screens/Compose/Layers/BorderLayer.cs

@@ -6,7 +6,7 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
 using OpenTK.Graphics;
 
-namespace osu.Game.Rulesets.Edit.Layers
+namespace osu.Game.Screens.Edit.Screens.Compose.Layers
 {
     public class BorderLayer : Container
     {

osu.Game/Screens/Edit/Screens/Compose/Layers/HitObjectMaskLayer.cs

@@ -1,20 +1,25 @@
 // Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System.Collections.Generic;
+using System.Linq;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Game.Rulesets.Edit;
 using osu.Game.Rulesets.Objects.Drawables;
 
-namespace osu.Game.Rulesets.Edit.Layers.Selection
+namespace osu.Game.Screens.Edit.Screens.Compose.Layers
 {
-    public class HitObjectOverlayLayer : CompositeDrawable
+    public class HitObjectMaskLayer : CompositeDrawable
     {
-        private readonly Dictionary<DrawableHitObject, HitObjectOverlay> existingOverlays = new Dictionary<DrawableHitObject, HitObjectOverlay>();
+        private readonly HitObjectComposer composer;
+        private readonly Container<HitObjectMask> overlayContainer;
 
-        public HitObjectOverlayLayer()
+        public HitObjectMaskLayer(HitObjectComposer composer)
         {
+            this.composer = composer;
             RelativeSizeAxes = Axes.Both;
+
+            InternalChild = overlayContainer = new Container<HitObjectMask> { RelativeSizeAxes = Axes.Both };
         }
 
         /// <summary>
@@ -23,12 +28,11 @@ namespace osu.Game.Rulesets.Edit.Layers.Selection
         /// <param name="hitObject">The <see cref="DrawableHitObject"/> to create an overlay for.</param>
         public void AddOverlay(DrawableHitObject hitObject)
         {
-            var overlay = CreateOverlayFor(hitObject);
+            var overlay = composer.CreateMaskFor(hitObject);
             if (overlay == null)
                 return;
 
-            existingOverlays[hitObject] = overlay;
+            overlayContainer.Add(overlay);
-            AddInternal(overlay);
         }
 
         /// <summary>
@@ -37,17 +41,22 @@ namespace osu.Game.Rulesets.Edit.Layers.Selection
         /// <param name="hitObject">The <see cref="DrawableHitObject"/> to remove the overlay for.</param>
         public void RemoveOverlay(DrawableHitObject hitObject)
         {
-            if (!existingOverlays.TryGetValue(hitObject, out var existing))
+            var existing = overlayContainer.FirstOrDefault(h => h.HitObject == hitObject);
+            if (existing == null)
                 return;
 
             existing.Hide();
             existing.Expire();
         }
 
-        /// <summary>
+        private SelectionBox currentSelectionBox;
-        /// Creates a <see cref="HitObjectOverlay"/> for a specific <see cref="DrawableHitObject"/>.
+
-        /// </summary>
+        public void AddSelectionOverlay() => AddInternal(currentSelectionBox = composer.CreateSelectionOverlay(overlayContainer));
-        /// <param name="hitObject">The <see cref="DrawableHitObject"/> to create the overlay for.</param>
+
-        protected virtual HitObjectOverlay CreateOverlayFor(DrawableHitObject hitObject) => null;
+        public void RemoveSelectionOverlay()
+        {
+            currentSelectionBox?.Hide();
+            currentSelectionBox?.Expire();
+        }
     }
 }

osu.Game/Screens/Edit/Screens/Compose/Layers/SelectionBox.cs

@@ -0,0 +1,102 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Input;
+using osu.Game.Graphics;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Edit.Types;
+using osu.Game.Rulesets.Objects.Drawables;
+using OpenTK;
+
+namespace osu.Game.Screens.Edit.Screens.Compose.Layers
+{
+    /// <summary>
+    /// A box which surrounds <see cref="DrawableHitObject"/>s and provides interactive handles, context menus etc.
+    /// </summary>
+    public class SelectionBox : VisibilityContainer
+    {
+        private readonly IReadOnlyList<HitObjectMask> overlays;
+
+        public const float BORDER_RADIUS = 2;
+
+        public SelectionBox(IReadOnlyList<HitObjectMask> overlays)
+        {
+            this.overlays = overlays;
+
+            Masking = true;
+            BorderThickness = BORDER_RADIUS;
+
+            InternalChild = new Box
+            {
+                RelativeSizeAxes = Axes.Both,
+                AlwaysPresent = true,
+                Alpha = 0
+            };
+
+            State = Visibility.Visible;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            BorderColour = colours.Yellow;
+        }
+
+        protected override void Update()
+        {
+            base.Update();
+
+            // Todo: We might need to optimise this
+
+            // Move the rectangle to cover the hitobjects
+            var topLeft = new Vector2(float.MaxValue, float.MaxValue);
+            var bottomRight = new Vector2(float.MinValue, float.MinValue);
+
+            foreach (var obj in overlays)
+            {
+                topLeft = Vector2.ComponentMin(topLeft, Parent.ToLocalSpace(obj.HitObject.SelectionQuad.TopLeft));
+                bottomRight = Vector2.ComponentMax(bottomRight, Parent.ToLocalSpace(obj.HitObject.SelectionQuad.BottomRight));
+            }
+
+            topLeft -= new Vector2(5);
+            bottomRight += new Vector2(5);
+
+            Size = bottomRight - topLeft;
+            Position = topLeft;
+        }
+
+        public override bool ReceiveMouseInputAt(Vector2 screenSpacePos) => overlays.Any(o => o.ReceiveMouseInputAt(screenSpacePos));
+
+        protected override bool OnMouseDown(InputState state, MouseDownEventArgs args) => true;
+
+        protected override bool OnDragStart(InputState state) => true;
+
+        protected override bool OnDrag(InputState state)
+        {
+            // Todo: Various forms of snapping
+            foreach (var hitObject in overlays.Select(o => o.HitObject.HitObject))
+            {
+                switch (hitObject)
+                {
+                    case IHasEditablePosition editablePosition:
+                        editablePosition.OffsetPosition(state.Mouse.Delta);
+                        break;
+                }
+            }
+            return true;
+        }
+
+        protected override bool OnDragEnd(InputState state) => true;
+
+        public override bool DisposeOnDeathRemoval => true;
+
+        protected override void PopIn() => this.FadeIn();
+        protected override void PopOut() => this.FadeOut();
+    }
+}

osu.Game/Screens/Edit/Screens/Compose/Layers/SelectionLayer.cs

@@ -8,12 +8,14 @@ using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Primitives;
+using osu.Framework.Graphics.Shapes;
 using osu.Framework.Input;
 using osu.Game.Rulesets.Objects.Drawables;
 using osu.Game.Rulesets.UI;
 using OpenTK;
+using OpenTK.Graphics;
 
-namespace osu.Game.Rulesets.Edit.Layers.Selection
+namespace osu.Game.Screens.Edit.Screens.Compose.Layers
 {
     public class SelectionLayer : CompositeDrawable
     {
@@ -27,6 +29,16 @@ namespace osu.Game.Rulesets.Edit.Layers.Selection
         /// </summary>
         public event Action<DrawableHitObject> ObjectDeselected;
 
+        /// <summary>
+        /// Invoked when the selection has been cleared.
+        /// </summary>
+        public event Action SelectionCleared;
+
+        /// <summary>
+        /// Invoked when the user has finished selecting all <see cref="DrawableHitObject"/>s.
+        /// </summary>
+        public event Action SelectionFinished;
+
         private readonly Playfield playfield;
 
         public SelectionLayer(Playfield playfield)
@@ -36,8 +48,7 @@ namespace osu.Game.Rulesets.Edit.Layers.Selection
             RelativeSizeAxes = Axes.Both;
         }
 
-        private SelectionBox selectionBox;
+        private DragBox dragBox;
-        private CaptureBox captureBox;
 
         private readonly HashSet<DrawableHitObject> selectedHitObjects = new HashSet<DrawableHitObject>();
 
@@ -49,20 +60,20 @@ namespace osu.Game.Rulesets.Edit.Layers.Selection
 
         protected override bool OnDragStart(InputState state)
         {
-            AddInternal(selectionBox = new SelectionBox());
+            AddInternal(dragBox = new DragBox());
             return true;
         }
 
         protected override bool OnDrag(InputState state)
         {
-            selectionBox.Show();
+            dragBox.Show();
 
             var dragPosition = state.Mouse.NativeState.Position;
             var dragStartPosition = state.Mouse.NativeState.PositionMouseDown ?? dragPosition;
 
             var screenSpaceDragQuad = new Quad(dragStartPosition.X, dragStartPosition.Y, dragPosition.X - dragStartPosition.X, dragPosition.Y - dragStartPosition.Y);
 
-            selectionBox.SetDragRectangle(screenSpaceDragQuad.AABBFloat);
+            dragBox.SetDragRectangle(screenSpaceDragQuad.AABBFloat);
             selectQuad(screenSpaceDragQuad);
 
             return true;
@@ -70,8 +81,8 @@ namespace osu.Game.Rulesets.Edit.Layers.Selection
 
         protected override bool OnDragEnd(InputState state)
         {
-            selectionBox.Hide();
+            dragBox.Hide();
-            selectionBox.Expire();
+            dragBox.Expire();
 
             finishSelection();
 
@@ -95,7 +106,7 @@ namespace osu.Game.Rulesets.Edit.Layers.Selection
             if (!select(hitObject))
                 return;
 
-            clearCapture();
+            clearSelection();
             finishSelection();
         }
 
@@ -122,7 +133,7 @@ namespace osu.Game.Rulesets.Edit.Layers.Selection
             if (!deselect(hitObject))
                 return;
 
-            clearCapture();
+            clearSelection();
             finishSelection();
         }
 
@@ -148,7 +159,7 @@ namespace osu.Game.Rulesets.Edit.Layers.Selection
             selectedHitObjects.ForEach(h => ObjectDeselected?.Invoke(h));
             selectedHitObjects.Clear();
 
-            clearCapture();
+            clearSelection();
         }
 
         /// <summary>
@@ -180,18 +191,49 @@ namespace osu.Game.Rulesets.Edit.Layers.Selection
             select(target);
         }
 
-        private void clearCapture()
+        private void clearSelection() => SelectionCleared?.Invoke();
-        {
-            captureBox?.Hide();
-            captureBox?.Expire();
-        }
 
         private void finishSelection()
         {
             if (selectedHitObjects.Count == 0)
                 return;
+            SelectionFinished?.Invoke();
+        }
 
-            AddInternal(captureBox = new CaptureBox(this, selectedHitObjects.ToList()));
+        /// <summary>
+        /// A box that represents a drag selection.
+        /// </summary>
+        private class DragBox : VisibilityContainer
+        {
+            /// <summary>
+            /// Creates a new <see cref="DragBox"/>.
+            /// </summary>
+            public DragBox()
+            {
+                Masking = true;
+                BorderColour = Color4.White;
+                BorderThickness = SelectionBox.BORDER_RADIUS;
+
+                Child = new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Alpha = 0.1f
+                };
+            }
+
+            public void SetDragRectangle(RectangleF rectangle)
+            {
+                var topLeft = Parent.ToLocalSpace(rectangle.TopLeft);
+                var bottomRight = Parent.ToLocalSpace(rectangle.BottomRight);
+
+                Position = topLeft;
+                Size = bottomRight - topLeft;
+            }
+
+            public override bool DisposeOnDeathRemoval => true;
+
+            protected override void PopIn() => this.FadeIn(250, Easing.OutQuint);
+            protected override void PopOut() => this.FadeOut(250, Easing.OutQuint);
         }
     }
 }

osu.Game/Screens/Edit/Screens/EditorScreen.cs

@@ -8,6 +8,9 @@ using osu.Game.Beatmaps;
 
 namespace osu.Game.Screens.Edit.Screens
 {
+    /// <summary>
+    /// TODO: eventually make this inherit Screen and add a local scren stack inside the Editor.
+    /// </summary>
     public class EditorScreen : Container
     {
         public readonly Bindable<WorkingBeatmap> Beatmap = new Bindable<WorkingBeatmap>();

osu.Game/osu.Game.csproj

@@ -362,10 +362,8 @@
     <Compile Include="Overlays\Volume\VolumeMeter.cs" />
     <Compile Include="Rulesets\Configuration\IRulesetConfigManager.cs" />
     <Compile Include="Rulesets\Configuration\RulesetConfigManager.cs" />
-    <Compile Include="Rulesets\Edit\Layers\BorderLayer.cs" />
+    <Compile Include="Rulesets\Edit\HitObjectMask.cs" />
-    <Compile Include="Rulesets\Edit\Layers\Selection\CaptureBox.cs" />
+    <Compile Include="Rulesets\Edit\Types\IHasEditablePosition.cs" />
-    <Compile Include="Rulesets\Edit\Layers\Selection\HitObjectOverlay.cs" />
-    <Compile Include="Rulesets\Edit\Layers\Selection\HitObjectOverlayLayer.cs" />
     <Compile Include="Rulesets\Mods\IApplicableFailOverride.cs" />
     <Compile Include="Rulesets\Mods\IApplicableMod.cs" />
     <Compile Include="Rulesets\Mods\IApplicableToBeatmapConverter.cs" />
@@ -380,6 +378,10 @@
     <Compile Include="Rulesets\Replays\Types\IConvertibleReplayFrame.cs" />
     <Compile Include="Rulesets\Scoring\Legacy\LegacyScoreParser.cs" />
     <Compile Include="Rulesets\UI\JudgementContainer.cs" />
+    <Compile Include="Screens\Edit\Screens\Compose\Layers\BorderLayer.cs" />
+    <Compile Include="Screens\Edit\Screens\Compose\Layers\HitObjectMaskLayer.cs" />
+    <Compile Include="Screens\Edit\Screens\Compose\Layers\SelectionBox.cs" />
+    <Compile Include="Screens\Edit\Screens\Compose\Layers\SelectionLayer.cs" />
     <Compile Include="Screens\Play\ScreenWithBeatmapBackground.cs" />
     <Compile Include="Screens\Play\PlayerSettings\VisualSettings.cs" />
     <Compile Include="Rulesets\Objects\CatmullApproximator.cs" />
@@ -394,8 +396,6 @@
     <Compile Include="Rulesets\UI\Scrolling\ScrollingRulesetContainer.cs" />
     <Compile Include="Screens\Select\ImportFromStablePopup.cs" />
     <Compile Include="Overlays\Settings\SettingsButton.cs" />
-    <Compile Include="Rulesets\Edit\Layers\Selection\SelectionBox.cs" />
-    <Compile Include="Rulesets\Edit\Layers\Selection\SelectionLayer.cs" />
     <Compile Include="Screens\Edit\Components\BottomBarContainer.cs" />
     <Compile Include="Screens\Edit\Components\PlaybackControl.cs" />
     <Compile Include="Screens\Edit\Components\TimeInfoContainer.cs" />