Add barline pooling for mania

osu.Game.Rulesets.Mania/ManiaSkinComponentLookup.cs

@@ -33,5 +33,6 @@ namespace osu.Game.Rulesets.Mania
         HitExplosion,
         StageBackground,
         StageForeground,
+        BarLine
     }
 }

osu.Game.Rulesets.Mania/Objects/BarLine.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 osu.Framework.Bindables;
 using osu.Game.Rulesets.Judgements;
 using osu.Game.Rulesets.Objects;
 
@@ -8,7 +9,15 @@ namespace osu.Game.Rulesets.Mania.Objects
 {
     public class BarLine : ManiaHitObject, IBarLine
     {
-        public bool Major { get; set; }
+        private HitObjectProperty<bool> major;
+
+        public Bindable<bool> MajorBindable => major.Bindable;
+
+        public bool Major
+        {
+            get => major.Value;
+            set => major.Value = value;
+        }
 
         public override Judgement CreateJudgement() => new IgnoreJudgement();
     }

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

@@ -1,9 +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.Bindables;
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Shapes;
+using osu.Game.Rulesets.Mania.Skinning.Default;
-using osuTK;
+using osu.Game.Skinning;
 
 namespace osu.Game.Rulesets.Mania.Objects.Drawables
 {
@@ -13,45 +15,41 @@ namespace osu.Game.Rulesets.Mania.Objects.Drawables
     /// </summary>
     public partial class DrawableBarLine : DrawableManiaHitObject<BarLine>
     {
+        public readonly Bindable<bool> Major = new Bindable<bool>();
+
+        public DrawableBarLine()
+            : this(null!)
+        {
+        }
+
         public DrawableBarLine(BarLine barLine)
             : base(barLine)
         {
             RelativeSizeAxes = Axes.X;
-            Height = barLine.Major ? 1.7f : 1.2f;
+        }
 
-            AddInternal(new Box
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            AddInternal(new SkinnableDrawable(new ManiaSkinComponentLookup(ManiaSkinComponents.BarLine), _ => new DefaultBarLine())
             {
-                Name = "Bar line",
+                Anchor = Anchor.Centre,
-                Anchor = Anchor.BottomCentre,
+                Origin = Anchor.Centre,
-                Origin = Anchor.BottomCentre,
-                RelativeSizeAxes = Axes.Both,
-                Alpha = barLine.Major ? 0.5f : 0.2f
             });
 
-            if (barLine.Major)
+            Major.BindValueChanged(major => Height = major.NewValue ? 1.7f : 1.2f, true);
-            {
+        }
-                Vector2 size = new Vector2(22, 6);
-                const float line_offset = 4;
 
-                AddInternal(new Circle
+        protected override void OnApply()
-                {
+        {
-                    Name = "Left line",
+            base.OnApply();
-                    Anchor = Anchor.CentreLeft,
+            Major.BindTo(HitObject.MajorBindable);
-                    Origin = Anchor.CentreRight,
+        }
 
-                    Size = size,
+        protected override void OnFree()
-                    X = -line_offset,
+        {
-                });
+            base.OnFree();
-
+            Major.UnbindFrom(HitObject.MajorBindable);
-                AddInternal(new Circle
-                {
-                    Name = "Right line",
-                    Anchor = Anchor.CentreRight,
-                    Origin = Anchor.CentreLeft,
-                    Size = size,
-                    X = line_offset,
-                });
-            }
         }
 
         protected override void UpdateStartTimeStateTransforms() => this.FadeOut(150);

osu.Game.Rulesets.Mania/Skinning/Default/DefaultBarLine.cs

@@ -0,0 +1,72 @@
+// 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.Rulesets.Mania.Objects.Drawables;
+using osu.Game.Rulesets.Objects.Drawables;
+using osuTK;
+
+namespace osu.Game.Rulesets.Mania.Skinning.Default
+{
+    public partial class DefaultBarLine : CompositeDrawable
+    {
+        private Bindable<bool> major = null!;
+
+        private Drawable mainLine = null!;
+        private Drawable leftAnchor = null!;
+        private Drawable rightAnchor = null!;
+
+        [BackgroundDependencyLoader]
+        private void load(DrawableHitObject drawableHitObject)
+        {
+            RelativeSizeAxes = Axes.Both;
+
+            AddInternal(mainLine = new Box
+            {
+                Name = "Bar line",
+                Anchor = Anchor.BottomCentre,
+                Origin = Anchor.BottomCentre,
+                RelativeSizeAxes = Axes.Both,
+            });
+
+            Vector2 size = new Vector2(22, 6);
+            const float line_offset = 4;
+
+            AddInternal(leftAnchor = new Circle
+            {
+                Name = "Left anchor",
+                Anchor = Anchor.CentreLeft,
+                Origin = Anchor.CentreRight,
+                Size = size,
+                X = -line_offset,
+            });
+
+            AddInternal(rightAnchor = new Circle
+            {
+                Name = "Right anchor",
+                Anchor = Anchor.CentreRight,
+                Origin = Anchor.CentreLeft,
+                Size = size,
+                X = line_offset,
+            });
+
+            major = ((DrawableBarLine)drawableHitObject).Major.GetBoundCopy();
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            major.BindValueChanged(updateMajor, true);
+        }
+
+        private void updateMajor(ValueChangedEvent<bool> major)
+        {
+            mainLine.Alpha = major.NewValue ? 0.5f : 0.2f;
+            leftAnchor.Alpha = rightAnchor.Alpha = major.NewValue ? 1 : 0;
+        }
+    }
+}

osu.Game.Rulesets.Mania/Skinning/Legacy/ManiaLegacySkinTransformer.cs

@@ -119,6 +119,9 @@ namespace osu.Game.Rulesets.Mania.Skinning.Legacy
                         case ManiaSkinComponents.StageForeground:
                             return new LegacyStageForeground();
 
+                        case ManiaSkinComponents.BarLine:
+                            return null; // Not yet implemented.
+
                         default:
                             throw new UnsupportedSkinComponentException(lookup);
                     }

osu.Game.Rulesets.Mania/UI/Stage.cs

@@ -136,6 +136,8 @@ namespace osu.Game.Rulesets.Mania.UI
                 columnFlow.SetContentForColumn(i, column);
                 AddNested(column);
             }
+
+            RegisterPool<BarLine, DrawableBarLine>(50, 200);
         }
 
         private ISkinSource currentSkin;
@@ -186,7 +188,7 @@ namespace osu.Game.Rulesets.Mania.UI
 
         public override bool Remove(DrawableHitObject h) => Columns.ElementAt(((ManiaHitObject)h.HitObject).Column - firstColumnIndex).Remove(h);
 
-        public void Add(BarLine barLine) => base.Add(new DrawableBarLine(barLine));
+        public void Add(BarLine barLine) => base.Add(barLine);
 
         internal void OnNewResult(DrawableHitObject judgedObject, JudgementResult result)
         {