Refactor code into UserTrackingScrollContainer

osu.Game/Graphics/Containers/UserTrackingScrollContainer.cs

@@ -0,0 +1,49 @@
+// 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;
+
+namespace osu.Game.Graphics.Containers
+{
+    public class UserTrackingScrollContainer : UserTrackingScrollContainer<Drawable>
+    {
+        public UserTrackingScrollContainer()
+        {
+        }
+
+        public UserTrackingScrollContainer(Direction direction)
+            : base(direction)
+        {
+        }
+    }
+
+    public class UserTrackingScrollContainer<T> : OsuScrollContainer<T>
+        where T : Drawable
+    {
+        /// <summary>
+        /// Whether the last scroll event was user triggered, directly on the scroll container.
+        /// </summary>
+        public bool UserScrolling { get; private set; }
+
+        public UserTrackingScrollContainer()
+        {
+        }
+
+        public UserTrackingScrollContainer(Direction direction)
+            : base(direction)
+        {
+        }
+
+        protected override void OnUserScroll(float value, bool animated = true, double? distanceDecay = default)
+        {
+            UserScrolling = true;
+            base.OnUserScroll(value, animated, distanceDecay);
+        }
+
+        public new void ScrollTo(float value, bool animated = true, double? distanceDecay = null)
+        {
+            UserScrolling = false;
+            base.ScrollTo(value, animated, distanceDecay);
+        }
+    }
+}