NAME

SYNOPSIS

#include <Xm/Xm.h>
voidXmRedisplayWidget(
Widgetwidget);

DESCRIPTION

This is primarily used in the context of X Printing if the programming model chosen by the application is synchronous; that is, it doesn't rely of X Print events for the driving of page layout but wants to completely control the sequence of rendering requests.

XmRedisplayWidget doesn't clear the widget window prior to calling the expose method, since this is handled by calls to XpStartPage .

widget

The widget to redisplay.

RETURN VALUE

ERRORS/WARNINGS

EXAMPLES

PrintOKCallback(print_dialog...)
/*-------------*/
{
    pshell = XmPrintSetup (print_dialog, pbs->print_screen,
                                   "Print", NULL, 0);
    XpStartJob(XtDisplay(pshell), XPSpool);
    /**** here I realize the shell, get its size, create my widget
     hierarchy: a bulletin board, and then a text widget,
     that I stuff with the video text widget buffer */
    /* get the total number of pages to print */
    XtVaGetValues(ptext, XmNrows, &prows,
                         XmNtotalLines, n_lines, NULL);
    n_pages = n_lines / prows;
    /***** now print the pages in a loop */
    for (cur_page=0; cur_page != n_pages; cur_page++) {
               XpStartPage(XtDisplay(pshell), XtWindow(pshell), False);
               XmRedisplayWidget(ptext);  /* do the drawing */
               XpEndPage(XtDisplay(pshell));
        XmTextScroll(ptext, prows);  /* get ready for next page */
    }
    /***** I'm done */
    XpEndJob(XtDisplay(pshell));
}

Of course, one could change the above code to include it in a fork() branch so that the main program is not blocked while printing is going on. Another way to achieve a "print-in-the-background" effect is to use an Xt workproc. Using the same sample application, that gives us:

Boolean
PrintOnePageWP(XtPointer npages) /* workproc */
/*-------------*/
{
    static int cur_page = 0;
    cur_page++;
    XpStartPage(XtDisplay(pshell), XtWindow(pshell), False);
    XmRedisplayWidget(ptext);  /* do the drawing */
    XpEndPage(XtDisplay(pshell));
    XmTextScroll(ptext, prows);  /*  get ready for next page */
    if (cur_page == n_pages) { /***** I'm done */
        XpEndJob(XtDisplay(pshell));
        XtDestroyWidget(pshell);
        XtCloseDisplay(XtDisplay(pshell));
    }
    return (cur_page == n_pages);
}
PrintOKCallback(...)
/*-------------*/
{
    pshell = XmPrintSetup (widget, pbs->print_screen,
                                   "Print", NULL, 0);
    XpStartJob(XtDisplay(pshell), XPSpool);
    /**** here I get the size of the shell, create my widget
          hierarchy: a bulletin board, and then a text widget,
                  that I stuff with the video text widget buffer */
    /* get the total number of pages to print */
    /* ... same code as above example */
    /***** print the pages in the background */
    XtAppAddWorkProc(app_context, PrintOnePageWP, n_pages);
}

SEE ALSO