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Assets/CharacterCustomizer/UI/Scripts/SmoothScroll.cs

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+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+using System.Collections;
+
+namespace CC
+{
+    public class SmoothScroll : ScrollRect
+    {
+        public bool SmoothScrolling { get; set; } = true;
+        public float SmoothScrollTime { get; set; } = 0.2f;
+
+        private Coroutine smoothScrollCoroutine;
+
+        public override void OnScroll(PointerEventData data)
+        {
+            if (!IsActive()) return;
+
+            if (SmoothScrolling)
+            {
+                // Stop any ongoing smooth scroll
+                if (smoothScrollCoroutine != null)
+                    StopCoroutine(smoothScrollCoroutine);
+
+                Vector2 positionBefore = normalizedPosition;
+                base.OnScroll(data);
+                Vector2 positionAfter = normalizedPosition;
+                normalizedPosition = positionBefore;
+
+                smoothScrollCoroutine = StartCoroutine(SmoothScrollToPosition(positionAfter));
+            }
+            else
+            {
+                base.OnScroll(data);
+            }
+        }
+
+        public void SetScrollTarget(Vector2 targetPosition)
+        {
+            if (SmoothScrolling)
+            {
+                if (smoothScrollCoroutine != null)
+                    StopCoroutine(smoothScrollCoroutine);
+
+                Vector2 positionBefore = normalizedPosition;
+                normalizedPosition = targetPosition;
+                Vector2 positionAfter = normalizedPosition;
+                normalizedPosition = positionBefore;
+
+                smoothScrollCoroutine = StartCoroutine(SmoothScrollToPosition(positionAfter));
+            }
+            else
+            {
+                normalizedPosition = targetPosition;
+            }
+        }
+
+        public void resetScroll(bool instant = false)
+        {
+            var smoothScroll = SmoothScrolling;
+            if (instant) SmoothScrolling = false;
+            StopAllCoroutines();
+            SetScrollTarget(new Vector2(0, 1));
+            LayoutRebuilder.ForceRebuildLayoutImmediate(content.GetComponent<RectTransform>());
+            if (instant) SmoothScrolling = smoothScroll;
+        }
+
+        public void ScrollToContent(RectTransform targetContent)
+        {
+            // Ensure targetContent is a child of the content area
+            if (targetContent == null || !targetContent.IsChildOf(content))
+            {
+                Debug.LogWarning("Target content is not a child of the scroll rect content.");
+                return;
+            }
+
+            // Calculate the target normalized position
+            Vector2 targetLocalPos = content.InverseTransformPoint(targetContent.position);
+            Vector2 contentSize = content.rect.size;
+            Vector2 viewportSize = viewport.rect.size;
+
+            Vector2 normalizedPos = new Vector2(
+                Mathf.Clamp01((targetLocalPos.x - viewportSize.x / 2) / (contentSize.x - viewportSize.x)),
+                Mathf.Clamp01((targetLocalPos.y - viewportSize.y / 2) / (contentSize.y - viewportSize.y))
+            );
+
+            SetScrollTarget(normalizedPos);
+        }
+
+        private IEnumerator SmoothScrollToPosition(Vector2 targetPosition)
+        {
+            float elapsedTime = 0f;
+            Vector2 startPosition = normalizedPosition;
+
+            while (elapsedTime < SmoothScrollTime)
+            {
+                elapsedTime += Time.unscaledDeltaTime;
+                normalizedPosition = Vector2.Lerp(startPosition, targetPosition, elapsedTime / SmoothScrollTime);
+                yield return null;
+            }
+
+            normalizedPosition = targetPosition;
+            smoothScrollCoroutine = null;
+        }
+    }
+}