XMapWindow(3X11)    RISC/os Reference Manual     XMapWindow(3X11)



NAME
     XMapWindow, XMapRaised, XMapSubwindows - map windows

SYNTAX
     XMapWindow(display, w)
           Display *display;
           Window w;

     XMapRaised(display, w)
           Display *display;
           Window w;

     XMapSubwindows(display, w)
           Display *display;
           Window w;

ARGUMENTS
     display   Specifies the connection to the X server.

     w         Specifies the window.

DESCRIPTION
     The XMapWindow function maps the window and all of its
     subwindows that have had map requests.  Mapping a window
     that has an unmapped ancestor does not display the window
     but marks it as eligible for display when the ancestor
     becomes mapped.  Such a window is called unviewable.  When
     all its ancestors are mapped, the window becomes viewable
     and will be visible on the screen if it is not obscured by
     another window.  This function has no effect if the window
     is already mapped.

     If the override-redirect of the window is False and if some
     other client has selected SubstructureRedirectMask on the
     parent window, then the X server generates a MapRequest
     event, and the XMapWindow function does not map the window.
     Otherwise, the window is mapped, and the X server generates
     a MapNotify event.

     If the window becomes viewable and no earlier contents for
     it are remembered, the X server tiles the window with its
     background.  If the window's background is undefined, the
     existing screen contents are not altered, and the X server
     generates zero or more Expose events.  If backing-store was
     maintained while the window was unmapped, no Expose events
     are generated.  If backing-store will now be maintained, a
     full-window exposure is always generated.  Otherwise, only
     visible regions may be reported.  Similar tiling and expo-
     sure take place for any newly viewable inferiors.

     If the window is an InputOutput window, XMapWindow generates
     Expose events on each InputOutput window that it causes to



                         Printed 1/24/91         Release 4 Page 1

XMapWindow(3X11)    RISC/os Reference Manual     XMapWindow(3X11)



     be displayed.  If the client maps and paints the window and
     if the client begins processing events, the window is
     painted twice.  To avoid this, first ask for Expose events
     and then map the window, so the client processes input
     events as usual.  The event list will include Expose for
     each window that has appeared on the screen. The client's
     normal response to an Expose event should be to repaint the
     window.  This method usually leads to simpler programs and
     to proper interaction with window managers.

     XMapWindow can generate a BadWindow error.

     The XMapRaised function essentially is similar to XMapWindow
     in that it maps the window and all of its subwindows that
     have had map requests.  However, it also raises the speci-
     fied window to the top of the stack.

     XMapRaised can generate a BadWindow error.

     The XMapSubwindows function maps all subwindows for a speci-
     fied window in top-to-bottom stacking order.  The X server
     generates Expose events on each newly displayed window.
     This may be much more efficient than mapping many windows
     one at a time because the server needs to perform much of
     the work only once, for all of the windows, rather than for
     each window.

     XMapSubwindows can generate a BadWindow error.

DIAGNOSTICS
     BadWindow A value for a Window argument does not name a
               defined Window.

SEE ALSO
     XChangeWindowAttributes(3X11), XConfigureWindow(3X11),
     XCreateWindow(3X11), XDestroyWindow(3X11),
     XRaiseWindow(3X11), XUnmapWindow(3X11)
     Xlib - C Language X Interface

















Release 4 Page 2         Printed 1/24/91