MetroFramework.Controls.MetroScrollBar.OnScroll C# (CSharp) Method

        private void OnScroll(ScrollEventType type, int oldValue, int newValue, ScrollOrientation orientation)
        {
            if (Scroll == null) return;

            if (orientation == ScrollOrientation.HorizontalScroll)
            {
                if (type != ScrollEventType.EndScroll && isFirstScrollEventHorizontal)
                {
                    type = ScrollEventType.First;
                }
                else if (!isFirstScrollEventHorizontal && type == ScrollEventType.EndScroll)
                {
                    isFirstScrollEventHorizontal = true;
                }
            }
            else
            {
                if (type != ScrollEventType.EndScroll && isFirstScrollEventVertical)
                {
                    type = ScrollEventType.First;
                }
                else if (!isFirstScrollEventHorizontal && type == ScrollEventType.EndScroll)
                {
                    isFirstScrollEventVertical = true;
                }
            }

            Scroll(this, new ScrollEventArgs(type, oldValue, newValue, orientation));
        }