Extract ShearedNub.cs implementation into its own entirely independent implementation

osu.Game/Graphics/UserInterface/ShearedNub.cs

@@ -1,26 +1,41 @@
 // 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.Extensions.Color4Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Effects;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Graphics.UserInterface;
+using osu.Game.Overlays;
 using osuTK;
+using osuTK.Graphics;
 
 namespace osu.Game.Graphics.UserInterface
 {
-    public partial class ShearedNub : Nub
+    public partial class ShearedNub : Container, IHasCurrentValue<bool>, IHasAccentColour
     {
+        protected const float BORDER_WIDTH = 3;
+
         public const int HEIGHT = 30;
         public const float EXPANDED_SIZE = 50;
 
         public static readonly Vector2 SHEAR = new Vector2(0.15f, 0);
 
+        private readonly Box fill;
+        private readonly Container main;
+
+        /// <summary>
+        ///  Implements the shape for the nub, allowing for any type of container to be used.
+        /// </summary>
+        /// <returns></returns>
         public ShearedNub()
         {
             Size = new Vector2(EXPANDED_SIZE, HEIGHT);
-        }
-
-        protected override Container CreateNubContainer() =>
-            new Container
+            InternalChild = main = new Container
             {
                 Shear = SHEAR,
                 BorderColour = Colour4.White,
@@ -30,6 +45,136 @@ protected override Container CreateNubContainer() =>
                 RelativeSizeAxes = Axes.Both,
                 Anchor = Anchor.TopCentre,
                 Origin = Anchor.TopCentre,
+                Child = fill = new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Alpha = 0,
+                    AlwaysPresent = true,
+                }
             };
+        }
+
+        [BackgroundDependencyLoader(true)]
+        private void load(OverlayColourProvider? colourProvider, OsuColour colours)
+        {
+            AccentColour = colourProvider?.Highlight1 ?? colours.Pink;
+            GlowingAccentColour = colourProvider?.Highlight1.Lighten(0.2f) ?? colours.PinkLighter;
+            GlowColour = colourProvider?.Highlight1 ?? colours.PinkLighter;
+
+            main.EdgeEffect = new EdgeEffectParameters
+            {
+                Colour = GlowColour.Opacity(0),
+                Type = EdgeEffectType.Glow,
+                Radius = 8,
+                Roundness = 4,
+            };
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            Current.BindValueChanged(onCurrentValueChanged, true);
+        }
+
+        private bool glowing;
+
+        public bool Glowing
+        {
+            get => glowing;
+            set
+            {
+                glowing = value;
+
+                if (value)
+                {
+                    main.FadeColour(GlowingAccentColour.Lighten(0.5f), 40, Easing.OutQuint)
+                        .Then()
+                        .FadeColour(GlowingAccentColour, 800, Easing.OutQuint);
+
+                    main.FadeEdgeEffectTo(Color4.White.Opacity(0.1f), 40, Easing.OutQuint)
+                        .Then()
+                        .FadeEdgeEffectTo(GlowColour.Opacity(0.1f), 800, Easing.OutQuint);
+                }
+                else
+                {
+                    main.FadeEdgeEffectTo(GlowColour.Opacity(0), 800, Easing.OutQuint);
+                    main.FadeColour(AccentColour, 800, Easing.OutQuint);
+                }
+            }
+        }
+
+        private readonly Bindable<bool> current = new Bindable<bool>();
+
+        public Bindable<bool> Current
+        {
+            get => current;
+            set
+            {
+                ArgumentNullException.ThrowIfNull(value);
+
+                current.UnbindBindings();
+                current.BindTo(value);
+            }
+        }
+
+        private Color4 accentColour;
+
+        public Color4 AccentColour
+        {
+            get => accentColour;
+            set
+            {
+                accentColour = value;
+                if (!Glowing)
+                    main.Colour = value;
+            }
+        }
+
+        private Color4 glowingAccentColour;
+
+        public Color4 GlowingAccentColour
+        {
+            get => glowingAccentColour;
+            set
+            {
+                glowingAccentColour = value;
+                if (Glowing)
+                    main.Colour = value;
+            }
+        }
+
+        private Color4 glowColour;
+
+        public Color4 GlowColour
+        {
+            get => glowColour;
+            set
+            {
+                glowColour = value;
+
+                var effect = main.EdgeEffect;
+                effect.Colour = Glowing ? value : value.Opacity(0);
+                main.EdgeEffect = effect;
+            }
+        }
+
+        private void onCurrentValueChanged(ValueChangedEvent<bool> filled)
+        {
+            const double duration = 200;
+
+            fill.FadeTo(filled.NewValue ? 1 : 0, duration, Easing.OutQuint);
+
+            if (filled.NewValue)
+            {
+                main.ResizeWidthTo(1, duration, Easing.OutElasticHalf);
+                main.TransformTo(nameof(BorderThickness), 8.5f, duration, Easing.OutElasticHalf);
+            }
+            else
+            {
+                main.ResizeWidthTo(0.75f, duration, Easing.OutQuint);
+                main.TransformTo(nameof(BorderThickness), BORDER_WIDTH, duration, Easing.OutQuint);
+            }
+        }
     }
 }