Extract common rearrangeable list design

osu.Game/Graphics/Containers/OsuRearrangeableListContainer.cs

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+// 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.Framework.Graphics.Containers;
+
+namespace osu.Game.Graphics.Containers
+{
+    public abstract class OsuRearrangeableListContainer<TModel> : RearrangeableListContainer<TModel>
+    {
+        /// <summary>
+        /// Whether any item is currently being dragged. Used to hide other items' drag handles.
+        /// </summary>
+        private readonly BindableBool playlistDragActive = new BindableBool();
+
+        protected override ScrollContainer<Drawable> CreateScrollContainer() => new OsuScrollContainer();
+
+        protected sealed override RearrangeableListItem<TModel> CreateDrawable(TModel item) => CreateOsuDrawable(item).With(d =>
+        {
+            d.PlaylistDragActive.BindTo(playlistDragActive);
+        });
+
+        protected abstract OsuRearrangeableListItem<TModel> CreateOsuDrawable(TModel item);
+    }
+}