Refactor beatmap header

osu.Game/Overlays/BeatmapSet/BeatmapSetHeader.cs

@@ -0,0 +1,34 @@
+// 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.Bindables;
+using osu.Framework.Graphics;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Rulesets;
+
+namespace osu.Game.Overlays.BeatmapSet
+{
+    public class BeatmapSetHeader : OverlayHeader
+    {
+        public readonly Bindable<RulesetInfo> Ruleset = new Bindable<RulesetInfo>();
+        public BeatmapRulesetSelector RulesetSelector;
+
+        protected override ScreenTitle CreateTitle() => new BeatmapHeaderTitle();
+
+        protected override Drawable CreateTitleContent() => RulesetSelector = new BeatmapRulesetSelector
+        {
+            Current = Ruleset
+        };
+
+        private class BeatmapHeaderTitle : ScreenTitle
+        {
+            public BeatmapHeaderTitle()
+            {
+                Title = @"beatmap";
+                Section = @"info";
+            }
+
+            protected override Drawable CreateIcon() => new ScreenTitleTextureIcon(@"Icons/changelog");
+        }
+    }
+}