FlatRedBall.Gui.ScrollBar.OnUpButtonClick C# (CSharp) Method

        private void OnUpButtonClick(Window callingWindow)
        {
            if (mFirstVisibleIndex > 0)
            {
                mFirstVisibleIndex--;
            }

            if (mAlignment == ScrollBarAlignment.Vertical)
            {
                mPositionBar.WorldUnitRelativeY += (float)(2 * (mScaleY - 2) * mSensitivity);
            }
            else
            {
                mPositionBar.WorldUnitRelativeX -= (float)(2 * (mScaleX - 2) * mSensitivity);
            }

            FixBar();

            if (UpButtonClick != null)
                UpButtonClick(this);
        }