Add basic structure for buttons

osu.Game/Beatmaps/Drawables/Cards/Buttons/BeatmapCardIconButton.cs

@@ -0,0 +1,46 @@
+// 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.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Graphics.Containers;
+using osu.Game.Overlays;
+using osuTK;
+
+namespace osu.Game.Beatmaps.Drawables.Cards.Buttons
+{
+    public abstract class BeatmapCardIconButton : OsuHoverContainer
+    {
+        protected readonly SpriteIcon Icon;
+
+        private float size;
+
+        public new float Size
+        {
+            get => size;
+            set
+            {
+                size = value;
+                Icon.Size = new Vector2(size);
+            }
+        }
+
+        protected BeatmapCardIconButton()
+        {
+            Add(Icon = new SpriteIcon());
+
+            AutoSizeAxes = Axes.Both;
+            Size = 12;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OverlayColourProvider colourProvider)
+        {
+            Anchor = Origin = Anchor.Centre;
+
+            IdleColour = colourProvider.Light1;
+            HoverColour = colourProvider.Content1;
+        }
+    }
+}