Further refactorings

osu.Game/Overlays/Music/Playlist.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 System;
+using System.Linq;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Beatmaps;
+using osu.Game.Graphics.Containers;
+using osuTK;
+
+namespace osu.Game.Overlays.Music
+{
+    public class Playlist : RearrangeableListContainer<BeatmapSetInfo>
+    {
+        public Action<BeatmapSetInfo> RequestSelection;
+
+        public readonly Bindable<BeatmapSetInfo> SelectedSet = new Bindable<BeatmapSetInfo>();
+
+        public new MarginPadding Padding
+        {
+            get => base.Padding;
+            set => base.Padding = value;
+        }
+
+        public void Filter(string searchTerm) => ((SearchContainer<RearrangeableListItem<BeatmapSetInfo>>)ListContainer).SearchTerm = searchTerm;
+
+        public BeatmapSetInfo FirstVisibleSet => Items.FirstOrDefault(i => ((DrawablePlaylistItem)ItemMap[i]).MatchingFilter);
+
+        protected override RearrangeableListItem<BeatmapSetInfo> CreateDrawable(BeatmapSetInfo item) => new DrawablePlaylistItem(item)
+        {
+            SelectedSet = { BindTarget = SelectedSet },
+            RequestSelection = set => RequestSelection?.Invoke(set)
+        };
+
+        protected override ScrollContainer<Drawable> CreateScrollContainer() => new OsuScrollContainer();
+
+        protected override FillFlowContainer<RearrangeableListItem<BeatmapSetInfo>> CreateListFillFlowContainer() => new SearchContainer<RearrangeableListItem<BeatmapSetInfo>>
+        {
+            Spacing = new Vector2(0, 3),
+            LayoutDuration = 200,
+            LayoutEasing = Easing.OutQuint,
+        };
+    }
+}