VisibleSizeChanged
virtual void VisibleSizeChanged(float oldWidth,
virtual void VisibleSizeChanged(float oldWidth,
VisibleSizeChanged(oldWidth, oldHeight, fVisibleWidth, fVisibleHeight);
fScrollSource->VisibleSizeChanged(oldWidth, oldHeight,
virtual void VisibleSizeChanged(float oldWidth,
virtual void VisibleSizeChanged(float oldWidth,