Add column and stage background to argon skin

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

@@ -0,0 +1,101 @@
+// 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.Input.Bindings;
+using osu.Framework.Input.Events;
+using osu.Game.Rulesets.Mania.UI;
+using osu.Game.Rulesets.UI.Scrolling;
+using osuTK.Graphics;
+
+namespace osu.Game.Rulesets.Mania.Skinning.Argon
+{
+    public class ArgonColumnBackground : CompositeDrawable, IKeyBindingHandler<ManiaAction>
+    {
+        private readonly IBindable<ScrollingDirection> direction = new Bindable<ScrollingDirection>();
+
+        private Color4 brightColour;
+        private Color4 dimColour;
+
+        private Box background = null!;
+        private Box backgroundOverlay = null!;
+
+        [Resolved]
+        private Column column { get; set; } = null!;
+
+        private Bindable<Color4> accentColour = null!;
+
+        public ArgonColumnBackground()
+        {
+            RelativeSizeAxes = Axes.Both;
+
+            Masking = true;
+            CornerRadius = ArgonNotePiece.CORNER_RADIUS;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(IScrollingInfo scrollingInfo)
+        {
+            InternalChildren = new[]
+            {
+                background = new Box
+                {
+                    Name = "Background",
+                    RelativeSizeAxes = Axes.Both,
+                },
+                backgroundOverlay = new Box
+                {
+                    Name = "Background Gradient Overlay",
+                    RelativeSizeAxes = Axes.Both,
+                    Height = 0.5f,
+                    Blending = BlendingParameters.Additive,
+                    Alpha = 0
+                }
+            };
+
+            accentColour = column.AccentColour.GetBoundCopy();
+            accentColour.BindValueChanged(colour =>
+            {
+                background.Colour = colour.NewValue.Darken(5);
+                brightColour = colour.NewValue.Opacity(0.6f);
+                dimColour = colour.NewValue.Opacity(0);
+            }, true);
+
+            direction.BindTo(scrollingInfo.Direction);
+            direction.BindValueChanged(onDirectionChanged, true);
+        }
+
+        private void onDirectionChanged(ValueChangedEvent<ScrollingDirection> direction)
+        {
+            if (direction.NewValue == ScrollingDirection.Up)
+            {
+                backgroundOverlay.Anchor = backgroundOverlay.Origin = Anchor.TopLeft;
+                backgroundOverlay.Colour = ColourInfo.GradientVertical(brightColour, dimColour);
+            }
+            else
+            {
+                backgroundOverlay.Anchor = backgroundOverlay.Origin = Anchor.BottomLeft;
+                backgroundOverlay.Colour = ColourInfo.GradientVertical(dimColour, brightColour);
+            }
+        }
+
+        public bool OnPressed(KeyBindingPressEvent<ManiaAction> e)
+        {
+            if (e.Action == column.Action.Value)
+                backgroundOverlay.FadeTo(1, 50, Easing.OutQuint).Then().FadeTo(0.5f, 250, Easing.OutQuint);
+            return false;
+        }
+
+        public void OnReleased(KeyBindingReleaseEvent<ManiaAction> e)
+        {
+            if (e.Action == column.Action.Value)
+                backgroundOverlay.FadeTo(0, 250, Easing.OutQuint);
+        }
+    }
+}

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

@@ -0,0 +1,16 @@
+// 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.Graphics.Containers;
+
+namespace osu.Game.Rulesets.Mania.Skinning.Argon
+{
+    public class ArgonStageBackground : CompositeDrawable
+    {
+        public ArgonStageBackground()
+        {
+            RelativeSizeAxes = Axes.Both;
+        }
+    }
+}

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

@@ -28,6 +28,12 @@ namespace osu.Game.Rulesets.Mania.Skinning.Argon
                     // TODO: Once everything is finalised, consider throwing UnsupportedSkinComponentException on missing entries.
                     switch (maniaComponent.Component)
                     {
+                        case ManiaSkinComponents.StageBackground:
+                            return new ArgonStageBackground();
+
+                        case ManiaSkinComponents.ColumnBackground:
+                            return new ArgonColumnBackground();
+
                         case ManiaSkinComponents.HoldNoteBody:
                             return new ArgonHoldBodyPiece();