Copyright (c) Xoetrope Ltd., 2001-2006, This software is licensed under
the GNU Public License (GPL), please see license.txt for more details. If
you make commercial use of this software you must purchase a commercial
license from Xoetrope.
XViewBoxListener(XSvgImageMap imageMap) Creates a new instance of ViewBoxListener.
Parameters: imageMap - the XSvgImageMap component used by this class.