focal (3) XExposeEvent.3.gz

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 send_event 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 redisplay 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(3),  XButtonEvent(3),  XCreateWindowEvent(3),  XCirculateEvent(3),   XCirculateRequestEvent(3),
       XColormapEvent(3),        XConfigureEvent(3),        XConfigureRequestEvent(3),        XCrossingEvent(3),
       XDestroyWindowEvent(3), XErrorEvent(3), XFocusChangeEvent(3), XGraphicsExposeEvent(3),  XGravityEvent(3),
       XKeymapEvent(3),     XMapEvent(3),     XMapRequestEvent(3),     XPropertyEvent(3),     XReparentEvent(3),
       XResizeRequestEvent(3),    XSelectionClearEvent(3),    XSelectionEvent(3),     XSelectionRequestEvent(3),
       XUnmapEvent(3), XVisibilityEvent(3)
       Xlib - C Language X Interface