UnityEditor.ColorPicker.GetScrollWheelDeltaInRect C# (CSharp) Method

        private float GetScrollWheelDeltaInRect(Rect rect)
        {
            Event current = Event.current;
            if ((current.type == EventType.ScrollWheel) && rect.Contains(current.mousePosition))
            {
                return current.delta.y;
            }
            return 0f;
        }