XVisibilityNotifyEvent(XS)     6 January 1993     XVisibilityNotifyEvent(XS)
                          X Version 11 (Release 5)


 Name

    XVisibilityNotifyEvent - VisibilityNotify event structure

 Structures

    The structure for VisibilityNotify events contains:

    typedef struct {
        int type;              /* VisibiltyNotify */
        unsigned long serial;  /* # of last request processed by server */
        Bool send_event;       /* true if this came from a SendEvent request */
        Display *display;      /* Display the event was read from */
        Window window;
        int state;
    } XVisibilityEvent;


    When you receive this event, the structure members are set as follows.

    The type member is set to the event type constant name that uniquely
    identifies it.  For example, when the X server reports a GraphicsExpose
    event to a client application, it sends an XGraphicsExposeEvent structure
    with the type member set to GraphicsExpose.  The display member is set to
    a pointer to the display the event was read on.  The sendevent member is
    set to True if the event came from a SendEvent protocol request.  The
    serial member is set from the serial number reported in the protocol but
    expanded from the 16-bit least-significant bits to a full 32-bit value.
    The window member is set to the window that is most useful to toolkit
    dispatchers.

    The window member is set to the window whose visibility state changes.
    The state member is set to the state of the window's visibility and can
    be VisibilityUnobscured, VisibilityPartiallyObscured, or VisibilityFul-
    lyObscured.  The X server ignores all of a window's subwindows when
    determining the visibility state of the window and processes Visibili-
    tyNotify events according to the following:

    +  When the window changes state from partially obscured, fully obscured,
       or not viewable to viewable and completely unobscured, the X server
       generates the event with the state member of the XVisibilityEvent
       structure set to VisibilityUnobscured.

    +  When the window changes state from viewable and completely unobscured
       or not viewable to viewable and partially obscured, the X server gen-
       erates the event with the state member of the XVisibilityEvent struc-
       ture set to VisibilityPartiallyObscured.

    +  When the window changes state from viewable and completely unobscured,
       viewable and partially obscured, or not viewable to viewable and fully
       obscured, the X server generates the event with the state member of
       the XVisibilityEvent structure set to VisibilityFullyObscured.


 See also

    XAnyEvent(XS), XButtonEvent(XS), XCreateWindowEvent(XS),
    XCirculateEvent(XS), XCirculateRequestEvent(XS), XColormapEvent(XS),
    XConfigureEvent(XS), XConfigureRequestEvent(XS), XCrossingEvent(XS), XDe-
    stroyWindowEvent(XS), XErrorEvent(XS), XExposeEvent(XS),
    XFocusChangeEvent(XS), XGraphicsExposeEvent(XS), XGravityEvent(XS),
    XKeymapEvent(XS), XMapEvent(XS), XMapRequestEvent(XS),
    XPropertyEvent(XS), XReparentEvent(XS), XResizeRequestEvent(XS),
    XSelectionClearEvent(XS), XSelectionEvent(XS),
    XSelectionRequestEvent(XS), XUnmapEvent(XS),
    Xlib - C Language X Interface