scroll horizontal card lists with normal mouse wheel

Assets/Scenes/BattleScene.unity

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Assets/Scripts/Script/HorizontalScrollWheelHandler.cs

@@ -0,0 +1,44 @@
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+
+/// <summary>
+/// Attach this to a ScrollRect GameObject to convert vertical mouse scroll wheel
+/// input into horizontal scrolling. Useful for horizontal card list panels.
+/// </summary>
+[RequireComponent(typeof(ScrollRect))]
+public class HorizontalScrollWheelHandler : MonoBehaviour, IScrollHandler
+{
+    private ScrollRect _scrollRect;
+
+    [Tooltip("Multiplier applied to the scroll delta. Increase for faster scrolling.")]
+    public float scrollSpeed = 1f;
+
+    private void Awake()
+    {
+        _scrollRect = GetComponent<ScrollRect>();
+    }
+
+    public void OnScroll(PointerEventData eventData)
+    {
+        if (!_scrollRect.horizontal)
+            return;
+
+        // Use Y scroll delta (mouse wheel) and apply it as horizontal movement.
+        // Negate so scrolling down moves right (conventional direction).
+        float delta = eventData.scrollDelta.y * scrollSpeed;
+
+        float contentWidth = _scrollRect.content.rect.width;
+        float viewportWidth = _scrollRect.viewport != null
+            ? _scrollRect.viewport.rect.width
+            : ((RectTransform)_scrollRect.transform).rect.width;
+
+        float scrollableWidth = contentWidth - viewportWidth;
+
+        if (scrollableWidth <= 0f)
+            return;
+
+        _scrollRect.horizontalNormalizedPosition =
+            Mathf.Clamp01(_scrollRect.horizontalNormalizedPosition - delta / scrollableWidth);
+    }
+}

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