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Assets/Packages/com.unity.uiextensions/Runtime/Scripts/Layout/ScrollSnapScrollbarHelper.cs

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+/// Credit Anonymous donation
+/// Sourced from - https://bitbucket.org/UnityUIExtensions/unity-ui-extensions/issues/120/horizontal-scroll-snap-scroll-bar-fix
+/// Updated by simonDarksideJ - Made extension support all types of scroll snap
+
+using UnityEngine.EventSystems;
+
+namespace UnityEngine.UI.Extensions
+{
+    [DisallowMultipleComponent]
+    public class ScrollSnapScrollbarHelper : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IBeginDragHandler, IEndDragHandler, IDragHandler
+    {
+        internal IScrollSnap ss;
+
+        public void OnBeginDrag(PointerEventData eventData)
+        {
+            OnScrollBarDown();
+        }
+
+        public void OnDrag(PointerEventData eventData)
+        {
+            ss.CurrentPage();
+        }
+
+        public void OnEndDrag(PointerEventData eventData)
+        {
+            OnScrollBarUp();
+        }
+
+        public void OnPointerDown(PointerEventData eventData)
+        {
+            OnScrollBarDown();
+        }
+
+        public void OnPointerUp(PointerEventData eventData)
+        {
+            OnScrollBarUp();
+        }
+
+        void OnScrollBarDown()
+        {
+            if (ss != null)
+            {
+                ss.SetLerp(false);
+                ss.StartScreenChange();
+            }
+        }
+
+        void OnScrollBarUp()
+        {
+            ss.SetLerp(true);
+            ss.ChangePage(ss.CurrentPage());
+        }
+    }
+}