Beyond_Beyaan.BBScrollBar.MouseUp C# (CSharp) Метод

        public bool MouseUp(int x, int y)
        {
            if (isEnabled)
            {
                bool changed = false;
                if (Up.MouseUp(x, y))
                {
                    if (TopIndex > 0)
                    {
                        TopIndex--;
                    }
                    changed = true;
                }
                else if (Down.MouseUp(x, y))
                {
                    if (TopIndex < amountOfItems - amountVisible)
                    {
                        TopIndex++;
                    }
                    changed = true;
                }
                if (changed || scrollSelected)
                {
                    scrollSelected = false;
                    if (!isSlider)
                    {
                        SetScrollButtonPosition();
                        Scroll.MouseUp(x, y);
                    }
                    return true;
                }
                if (x >= xPos && x < xPos + 16 + (isHorizontal ? scrollBarLength : 0) && yPos + 16 <= y && y < yPos + 16 + (isHorizontal ? 0 : scrollBarLength))
                {
                    return true;
                }
            }
            return false;
        }