/**
* Handle left click on a picture by bringing it to the top.
*
* @param event The object providing details of the mouse event.
*/
public void mousePressed(final MouseEvent event) {
Picture picture;
if (!event.isMetaDown()) {
picture = mMosaic.pictureAt(event.getX(), event.getY());
if (null != picture) bringToTop(picture);
}
}
