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

        private void SetupScrollBar()
        {
            if (inUpdate) return;

            if (Orientation == MetroScrollOrientation.Vertical)
            {
                thumbWidth = Width > 0 ? Width : 10;
                thumbHeight = GetThumbSize();

                clickedBarRectangle = ClientRectangle;
                clickedBarRectangle.Inflate(-1, -1);

                thumbRectangle = new Rectangle(ClientRectangle.X, ClientRectangle.Y, thumbWidth, thumbHeight);

                thumbPosition = thumbRectangle.Height/2;
                thumbBottomLimitBottom = ClientRectangle.Bottom;
                thumbBottomLimitTop = thumbBottomLimitBottom - thumbRectangle.Height;
                thumbTopLimit = ClientRectangle.Y;
            }
            else
            {
                thumbHeight = Height > 0 ? Height : 10;
                thumbWidth = GetThumbSize();

                clickedBarRectangle = ClientRectangle;
                clickedBarRectangle.Inflate(-1, -1);

                thumbRectangle = new Rectangle(ClientRectangle.X, ClientRectangle.Y, thumbWidth, thumbHeight);

                thumbPosition = thumbRectangle.Width/2;
                thumbBottomLimitBottom = ClientRectangle.Right;
                thumbBottomLimitTop = thumbBottomLimitBottom - thumbRectangle.Width;
                thumbTopLimit = ClientRectangle.X;
            }

            ChangeThumbPosition(GetThumbPosition());

            Refresh();
        }