Showcase SmoothScrollRect

Figured I'd share my smooth scrollrect script. This script extends the ScrollRect class and provides a smooth scrolling effect on mobile devices using the Vector2.SmoothDamp method. It also calculates the nearest anchor point to snap the content to when the scrolling ends.

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.UI;
3. using UnityEngine.EventSystems;
4.  
5. public class SmoothScrollRect : ScrollRect
6. {
7.     [SerializeField] private float _smoothTime = 0.3f;
8.  
9.     private Vector2 _velocity;
10.  
11.     protected override void LateUpdate()
12.     {
13.         if (!Input.GetMouseButton(0) && content != null)
14.         {
15.             Vector2 targetPosition = CalculateTargetPosition();
16.  
17.             if ((targetPosition - content.anchoredPosition).magnitude > 0.1f)
18.             {
19.                 content.anchoredPosition = Vector2.SmoothDamp(content.anchoredPosition, targetPosition, ref _velocity, _smoothTime);
20.             }
21.             else
22.             {
23.                 content.anchoredPosition = targetPosition;
24.             }
25.         }
26.     }
27.  
28.     private Vector2 CalculateTargetPosition()
29.     {
30.         Vector2 targetPosition = content.anchoredPosition;
31.  
32.         if (vertical && Mathf.Abs(_velocity.y) > 0.1f)
33.         {
34.             targetPosition.y += _velocity.y * Time.deltaTime;
35.         }
36.  
37.         if (horizontal && Mathf.Abs(_velocity.x) > 0.1f)
38.         {
39.             targetPosition.x += _velocity.x * Time.deltaTime;
40.         }
41.  
42.         targetPosition = CalculateNearestAnchor(targetPosition);
43.  
44.         return targetPosition;
45.     }
46.  
47.     private Vector2 CalculateNearestAnchor(Vector2 position)
48.     {
49.         float distance = Mathf.Infinity;
50.         Vector2 nearestAnchor = position;
51.  
52.         foreach (Transform anchor in content)
53.         {
54.             if (!anchor.gameObject.activeInHierarchy) continue;
55.  
56.             float currentDistance = Vector2.Distance(position, anchor.position);
57.             if (currentDistance < distance)
58.             {
59.                 distance = currentDistance;
60.                 nearestAnchor = anchor.position;
61.             }
62.         }
63.  
64.         return nearestAnchor;
65.     }
66.  
67.     public override void OnBeginDrag(PointerEventData eventData)
68.     {
69.         base.OnBeginDrag(eventData);
70.         _velocity = Vector2.zero;
71.     }
72.  
73.     public override void OnEndDrag(PointerEventData eventData)
74.     {
75.         base.OnEndDrag(eventData);
76.     }
77. }
78.