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/*
* This source module is derived from an example program from Chapter 21 of
* Volume Six A of the O'Reilly & Associates, Inc. book, "Motif Programming
* Manual", by Dan Heller & Paula M. Ferguson. Here is the required copy-
* right notice:
*
* Written by Dan Heller and Paula Ferguson.
* Copyright 1994, O'Reilly & Associates, Inc.
* Permission to use, copy, and modify this program without
* restriction is hereby granted, as long as this copyright
* notice appears in each copy of the program source code.
* This program is freely distributable without licensing fees and
* is provided without guarantee or warrantee expressed or implied.
* This program is -not- in the public domain.
*/
#include <Xm/Xm.h>
/*
* This function is a superset of XmUpdateDisplay() that ensures
* that a window's contents are visible before returning.
* The monitoring of window states is necessary because an attempt to
* map a window is subject to the whim of the window manager, which can
* introduce a significant delay before the window is actually mapped
* and exposed. This function is intended to be called after XtPopup(),
* XtManageChild() or XMapRaised(). Don't use it in other situations
* as it may sit and process other unrelated events until the widget
* becomes visible.
*/
force_update(w)
Widget w; /* This widget must be visible before the function returns */
{
Widget diashell, topshell;
Window diawindow, topwindow;
XtAppContext cxt = XtWidgetToApplicationContext(w);
Display *dpy;
XWindowAttributes xwa;
XEvent event;
/* Locate the shell we are interested in */
for (diashell=w; !XtIsShell(diashell); diashell=XtParent(diashell))
;
/* Locate its primary window's shell (which may be the same) */
for (topshell = diashell; !XtIsTopLevelShell(topshell);
topshell = XtParent(topshell))
;
/* If the dialog shell (or its primary shell window) is not realized,
* don't bother ... nothing can possibly happen
*/
if (XtIsRealized(diashell) && XtIsRealized(topshell)) {
dpy = XtDisplay(topshell);
diawindow = XtWindow(diashell);
topwindow = XtWindow(topshell);
/* Wait for the dialog to be mapped. It's guaranteed to become so */
while (XGetWindowAttributes(dpy, diawindow, &xwa),
xwa.map_state != IsViewable) {
/* ...if the primary is (or becomes) unviewable or unmapped,
* it's probably iconic, and nothing will happen.
*/
if (XGetWindowAttributes(dpy, topwindow, &xwa) &&
xwa.map_state != IsViewable)
break;
/* we are guaranteed there will be an event of some kind */
XtAppNextEvent(cxt, &event);
XtDispatchEvent(&event);
}
}
/* The next XSync() will get an expose event */
XmUpdateDisplay(topshell);
}
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