3. The query_geometry() Method

For BulletinBoard, the query_geometry() method is probably the simplest - it does nothing on it's own behalf, but uses either the GeoMatrix (if a geo_matrix_create() method exists), or the generic method. This simplicity is deceiving; the complexity isn't visible in BulletinBoard - it's been shifted elsewhere.

_XmHandleQueryGeometry

static XtGeometryResult 
query_geometry(Widget w, XtWidgetGeometry *proposed,
               XtWidgetGeometry *answer)
{
    XmBulletinBoardWidgetClass bbc = (XmBulletinBoardWidgetClass)XtClass(w);
    XtGeometryResult res;

    if (bbc->bulletin_board_class.geo_matrix_create) {
        return _XmHandleQueryGeometry(w, proposed, answer,
                                      BB_ResizePolicy(w),
                                      bbc->bulletin_board_class.
                                        geo_matrix_create);
    }
    res = _XmGMHandleQueryGeometry(w, proposed, answer,
                                   BB_MarginWidth(w), BB_MarginHeight(w),
                                   BB_ResizePolicy(w));
    return res;
}