/* $TOG: ValTime.c /main/6 1997/06/18 17:46:26 samborn $ */

/*

 * Motif

 *

 * Copyright (c) 1987-2012, The Open Group. All rights reserved.

 *

 * These libraries and programs are free software; you can

 * redistribute them and/or modify them under the terms of the GNU

 * Lesser General Public License as published by the Free Software

 * Foundation; either version 2 of the License, or (at your option)

 * any later version.

 *

 * These libraries and programs are distributed in the hope that

 * they will be useful, but WITHOUT ANY WARRANTY; without even the

 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR

 * PURPOSE. See the GNU Lesser General Public License for more

 * details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with these librararies and programs; if not, write

 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth

 * Floor, Boston, MA 02110-1301 USA

 * 

 */

/*

 * HISTORY

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include "XmI.h"

/**********************************************************************

 *

 *  _XmValidTimestamp

 *      Returns a valid timestamp by generating an event.  The time

 *      that is returned is not 0 or CurrentTime.

 *      Arguments: w - any widget on the display.

 *

 **********************************************************************/

Time 

_XmValidTimestamp(

     Widget w )

{

  Window win;

  Display *dsp = XtDisplay(w);

  XEvent event;

  EventMask shellMask;

  Atom timeProp = XInternAtom(dsp, XmI_MOTIF_CURRENT_TIME, False);

  while (!XtIsShell(w)) w = XtParent(w);

  win = XtWindow(w);

  if (! ((shellMask = XtBuildEventMask(w)) & PropertyChangeMask) )

    XSelectInput(dsp, win, shellMask | PropertyChangeMask);

  XChangeProperty(dsp, win, timeProp, timeProp,

		  8, PropModeAppend, NULL, 0);

  XWindowEvent(dsp, win, PropertyChangeMask, &event);

  if (!(shellMask & PropertyChangeMask))

    XSelectInput(dsp, win, shellMask);

  return (event.xproperty.time);

}