106) How can I control placement of a popup widget? Each time a

popup is created, it is placed in or over the middle of its parent.  How can I
make it obey the XmNx and XmNy values?

Answer: Set the resource XmNdefaultPosition for the popup to False.  Set the
position of the popup by the resource values of XmNx and XmNy.  Do not use
XtMoveWidget, as this is for widget writers only.  Here's a demo program from
Dan Heller:

/* Written by Dan Heller.  Copyright 1991, O'Reilly && Associates.
 * This program is freely distributable without licensing fees and
 * is provided without guarantee or warranty expressed or implied.
 * This program is -not- in the public domain.  This program is
 * taken from the Motif Programming Manual, O'Reilly Volume 6.
 */

/* map_dlg.c -- Use the XmNmapCallback to automatically position
 * a dialog on the screen.  Each time the dialog is displayed, it
 * is mapped down and to the right by 200 pixels in each direction.
 */
#include <Xm/MessageB.h>
#include <Xm/PushB.h>

/* main() --create a pushbutton whose callback pops up a dialog box */
main(argc, argv)
char *argv[];
{
    Widget toplevel, button;
    XtAppContext app;
    void pushed();

    toplevel = XtVaAppInitialize(&app, "Demos",
        NULL, 0, &argc, argv, NULL, NULL);

    button = XtCreateManagedWidget("button", xmPushButtonWidgetClass,
        toplevel, NULL, 0);
    XtAddCallback(button, XmNactivateCallback, pushed, "Hello World");

    XtRealizeWidget(toplevel);
    XtAppMainLoop(app);
}

/* callback function for XmNmapCallback.  Position dialog in 200 pixel
 * "steps".  When the edge of the screen is hit, start over.
 */
static void
map_dialog(dialog, client_data, cbs)
Widget dialog;
XtPointer client_data;
XmAnyCallbackStruct *cbs;
{
    static Position x, y;
    Dimension w, h;

    XtVaGetValues(dialog, XmNwidth, &w, XmNheight, &h, NULL);
    if ((x + w) >= WidthOfScreen(XtScreen(dialog)))
        x = 0;
    if ((y + h) >= HeightOfScreen(XtScreen(dialog)))
        y = 0;
    XtVaSetValues(dialog, XmNx, x, XmNy, y, NULL);
    x += 200, y += 200;
}

/* pushed() --the callback routine for the main app's pushbutton.
 * Create and popup a dialog box that has callback functions for
 * the Ok, Cancel and Help buttons.
 */
void
pushed(w, message)
Widget w;
char *message; /* The client_data parameter passed by XtAddCallback */
{
    Widget dialog;
    Arg arg[3];
    XmString t = XmStringCreateSimple(message);
    extern void response();

    XtSetArg(arg[0], XmNautoUnmanage, False);
    XtSetArg(arg[1], XmNmessageString, t);
    XtSetArg(arg[2], XmNdefaultPosition, False);
    dialog = XmCreateMessageDialog(w, "notice", arg, 3);
    XmStringFree(t);

    XtAddCallback(dialog, XmNmapCallback, map_dialog, NULL);

    XtManageChild(dialog);
    XtPopup(XtParent(dialog), XtGrabNone);
}