Update ChevronButton position/colour

osu.Game/Overlays/Comments/Buttons/ChevronButton.cs

@@ -0,0 +1,48 @@
+// 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.Game.Graphics.Containers;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics.Sprites;
+using osuTK;
+using osu.Framework.Allocation;
+
+namespace osu.Game.Overlays.Comments.Buttons
+{
+    public class ChevronButton : OsuHoverContainer
+    {
+        public readonly BindableBool Expanded = new BindableBool(true);
+
+        private readonly SpriteIcon icon;
+
+        public ChevronButton()
+        {
+            Size = new Vector2(40, 22);
+            Child = icon = new SpriteIcon
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                Size = new Vector2(12),
+            };
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OverlayColourProvider colourProvider)
+        {
+            IdleColour = HoverColour = colourProvider.Foreground1;
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            Action = Expanded.Toggle;
+            Expanded.BindValueChanged(onExpandedChanged, true);
+        }
+
+        private void onExpandedChanged(ValueChangedEvent<bool> expanded)
+        {
+            icon.Icon = expanded.NewValue ? FontAwesome.Solid.ChevronUp : FontAwesome.Solid.ChevronDown;
+        }
+    }
+}