Add basic argon note piece

osu.Game.Rulesets.Mania/Skinning/Argon/ArgonHitTarget.cs

@@ -6,7 +6,6 @@ using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
-using osu.Game.Rulesets.Mania.Skinning.Default;
 using osu.Game.Rulesets.UI.Scrolling;
 using osuTK.Graphics;
 
@@ -20,7 +19,7 @@ namespace osu.Game.Rulesets.Mania.Skinning.Argon
         private void load(IScrollingInfo scrollingInfo)
         {
             RelativeSizeAxes = Axes.X;
-            Height = DefaultNotePiece.NOTE_HEIGHT;
+            Height = ArgonNotePiece.NOTE_HEIGHT;
 
             InternalChildren = new[]
             {

osu.Game.Rulesets.Mania/Skinning/Argon/ArgonNotePiece.cs

@@ -0,0 +1,110 @@
+// 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.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Colour;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Rulesets.UI.Scrolling;
+using osuTK;
+using osuTK.Graphics;
+
+namespace osu.Game.Rulesets.Mania.Skinning.Argon
+{
+    internal class ArgonNotePiece : CompositeDrawable
+    {
+        public const float NOTE_HEIGHT = 42;
+
+        public const float CORNER_RADIUS = 3;
+
+        private readonly IBindable<ScrollingDirection> direction = new Bindable<ScrollingDirection>();
+        private readonly IBindable<Color4> accentColour = new Bindable<Color4>();
+
+        private readonly Box colouredBox;
+        private readonly Box shadow;
+
+        public ArgonNotePiece()
+        {
+            RelativeSizeAxes = Axes.X;
+            Height = NOTE_HEIGHT;
+
+            CornerRadius = CORNER_RADIUS;
+            Masking = true;
+
+            InternalChildren = new Drawable[]
+            {
+                shadow = new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                },
+                new Container
+                {
+                    Anchor = Anchor.BottomLeft,
+                    Origin = Anchor.BottomLeft,
+                    RelativeSizeAxes = Axes.Both,
+                    Height = 0.82f,
+                    Masking = true,
+                    CornerRadius = CORNER_RADIUS,
+                    Children = new Drawable[]
+                    {
+                        colouredBox = new Box
+                        {
+                            RelativeSizeAxes = Axes.Both,
+                        }
+                    }
+                },
+                new Circle
+                {
+                    Anchor = Anchor.BottomLeft,
+                    Origin = Anchor.BottomLeft,
+                    RelativeSizeAxes = Axes.X,
+                    Height = CORNER_RADIUS * 2,
+                },
+                new SpriteIcon
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Y = 4,
+                    Icon = FontAwesome.Solid.AngleDown,
+                    Size = new Vector2(20),
+                    Scale = new Vector2(1, 0.7f)
+                }
+            };
+        }
+
+        [BackgroundDependencyLoader(true)]
+        private void load(IScrollingInfo scrollingInfo, DrawableHitObject? drawableObject)
+        {
+            direction.BindTo(scrollingInfo.Direction);
+            direction.BindValueChanged(onDirectionChanged, true);
+
+            if (drawableObject != null)
+            {
+                accentColour.BindTo(drawableObject.AccentColour);
+                accentColour.BindValueChanged(onAccentChanged, true);
+            }
+        }
+
+        private void onDirectionChanged(ValueChangedEvent<ScrollingDirection> direction)
+        {
+            colouredBox.Anchor = colouredBox.Origin = direction.NewValue == ScrollingDirection.Up
+                ? Anchor.TopCentre
+                : Anchor.BottomCentre;
+        }
+
+        private void onAccentChanged(ValueChangedEvent<Color4> accent)
+        {
+            colouredBox.Colour = ColourInfo.GradientVertical(
+                accent.NewValue.Lighten(0.1f),
+                accent.NewValue
+            );
+
+            shadow.Colour = accent.NewValue.Darken(0.5f);
+        }
+    }
+}

osu.Game.Rulesets.Mania/Skinning/Argon/ManiaArgonSkinTransformer.cs

@@ -29,6 +29,10 @@ namespace osu.Game.Rulesets.Mania.Skinning.Argon
                     // TODO: Once everything is finalised, consider throwing UnsupportedSkinComponentException on missing entries.
                     switch (maniaComponent.Component)
                     {
+                        case ManiaSkinComponents.HoldNoteHead:
+                        case ManiaSkinComponents.Note:
+                            return new ArgonNotePiece();
+
                         case ManiaSkinComponents.HitTarget:
                             return new ArgonHitTarget();