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


 Name

    XExposeEvent - Expose event structure

 Structures

    The structure for Expose events contains:

    typedef struct {
        int type;              /* Expose */
        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 x, y;
        int width, height;
        int count;             /* if nonzero, at least this many more */
    } XExposeEvent;

    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 exposed (damaged) window.  The x and y
    members are set to the coordinates relative to the window's origin and
    indicate the upper-left corner of the rectangle.  The width and height
    members are set to the size (extent) of the rectangle.  The count member
    is set to the number of Expose events that are to follow.  If count is
    zero, no more Expose events follow for this window.  However, if count is
    nonzero, at least that number of Expose events (and possibly more) follow
    for this window.  Simple applications that do not want to optimize redis-
    play by distinguishing between subareas of its window can just ignore all
    Expose events with nonzero counts and perform full redisplays on events
    with zero counts.

 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), 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),
    XVisibilityEvent(XS)
    Xlib - C Language X Interface