XCheckMaskEvent(3)


NAME

   XNextEvent, XPeekEvent, XWindowEvent, XCheckWindowEvent, XMaskEvent,
   XCheckMaskEvent, XCheckTypedEvent, XCheckTypedWindowEvent - select
   events by type

SYNTAX

   int XNextEvent(Display *display, XEvent *event_return);

   int XPeekEvent(Display *display, XEvent *event_return);

   int XWindowEvent(Display *display, Window w, long event_mask, XEvent
          *event_return);

   Bool XCheckWindowEvent(Display *display, Window w, long event_mask,
          XEvent *event_return);

   int XMaskEvent(Display *display, long event_mask, XEvent
          *event_return);

   Bool XCheckMaskEvent(Display *display, long event_mask, XEvent
          *event_return);

   Bool XCheckTypedEvent(Display *display, int event_type, XEvent
          *event_return);

   Bool XCheckTypedWindowEvent(Display *display, Window w, int event_type,
          XEvent *event_return);

ARGUMENTS

   display   Specifies the connection to the X server.

   event_mask
             Specifies the event mask.

   event_return
             Returns the matched event's associated structure.

   event_return
             Returns the next event in the queue.

   event_return
             Returns a copy of the matched event's associated structure.

   event_type
             Specifies the event type to be compared.

   w         Specifies the window  whose event uou are interested in.

DESCRIPTION

   The XNextEvent function copies the first event from the event queue
   into the specified XEvent structure and then removes it from the queue.
   If the event queue is empty, XNextEvent flushes the output buffer and
   blocks until an event is received.

   The XPeekEvent function returns the first event from the event queue,
   but it does not remove the event from the queue.  If the queue is
   empty, XPeekEvent flushes the output buffer and blocks until an event
   is received.  It then copies the event into the client-supplied XEvent
   structure without removing it from the event queue.

   The XWindowEvent function searches the event queue for an event that
   matches both the specified window and event mask.  When it finds a
   match, XWindowEvent removes that event from the queue and copies it
   into the specified XEvent structure.  The other events stored in the
   queue are not discarded.  If a matching event is not in the queue,
   XWindowEvent flushes the output buffer and blocks until one is
   received.

   The XCheckWindowEvent function searches the event queue and then the
   events available on the server connection for the first event that
   matches the specified window and event mask.  If it finds a match,
   XCheckWindowEvent removes that event, copies it into the specified
   XEvent structure, and returns True.  The other events stored in the
   queue are not discarded.  If the event you requested is not available,
   XCheckWindowEvent returns False, and the output buffer will have been
   flushed.

   The XMaskEvent function searches the event queue for the events
   associated with the specified mask.  When it finds a match, XMaskEvent
   removes that event and copies it into the specified XEvent structure.
   The other events stored in the queue are not discarded.  If the event
   you requested is not in the queue, XMaskEvent flushes the output buffer
   and blocks until one is received.

   The XCheckMaskEvent function searches the event queue and then any
   events available on the server connection for the first event that
   matches the specified mask.  If it finds a match, XCheckMaskEvent
   removes that event, copies it into the specified XEvent structure, and
   returns True.  The other events stored in the queue are not discarded.
   If the event you requested is not available, XCheckMaskEvent returns
   False, and the output buffer will have been flushed.

   The XCheckTypedEvent function searches the event queue and then any
   events available on the server connection for the first event that
   matches the specified type.  If it finds a match, XCheckTypedEvent
   removes that event, copies it into the specified XEvent structure, and
   returns True.  The other events in the queue are not discarded.  If the
   event is not available, XCheckTypedEvent returns False, and the output
   buffer will have been flushed.

   The XCheckTypedWindowEvent function searches the event queue and then
   any events available on the server connection for the first event that
   matches the specified type and window.  If it finds a match,
   XCheckTypedWindowEvent removes the event from the queue, copies it into
   the specified XEvent structure, and returns True.  The other events in
   the queue are not discarded.  If the event is not available,
   XCheckTypedWindowEvent returns False, and the output buffer will have
   been flushed.

SEE ALSO

   XAnyEvent(3), XIfEvent(3), XPutBackEvent(3), XSendEvent(3)
   Xlib - C Language X Interface





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