XtRemoveEventHandler man page on HP-UX

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XtRemoveEventHandler()					XtRemoveEventHandler()

Name
  XtRemoveEventHandler	-  remove  an event handler, or change the condi‐
  tions under which it is called.

Synopsis
  void	  XtRemoveEventHandler(w,    event_mask,    nonmaskable,    proc,
  client_data)
	 Widget w;
	 EventMask event_mask;
	 Boolean nonmaskable;
	 XtEventHandler proc;
	 XtPointer client_data;

Inputs
  w	    Specifies  the  widget  for which this handler is registered.
	    Must be of class Core or any subclass thereof.

  event_mask
	    Specifies the events for which to unregister this handler.

  nonmaskable
	    Specifies whether this handler  should  be	unregistered  for
	    nonmaskable events.

  proc	    Specifies the handler procedure.

  client_data
	    Specifies the client data with which the procedure was regis‐
	    tered.

Description
  XtRemoveEventHandler() stops the proc/client_data  event  handler  pair
  registered  with  XtAddEventHandler()	 or  XtInsertEventHandler()  from
  being called from widget w in	 response  to  the  events  specified  in
  event_mask.  In addition, if nonmaskable is True, then the handler will
  no longer be called in response to the nonmaskable events:  GraphicsEx‐
  pose,	  NoExpose,  SelectionClear,  SelectionRequest,	 SelectionNotify,
  ClientMessage, and MappingNotify.

  A handler is removed only if both the procedure  proc	 and  client_data
  match	 a  previously	registered handler/data pair.  If a handler to be
  removed fails to match a procedure, or if it has been registered with a
  different  value of client_data, XtRemoveEventHandler() returns without
  reporting an error.

  XtRemoveEventHandler() accepts the special  value  XtAllEvents  in  the
  event_handler	 argument  as  a  signal that the event handler should no
  longer be called in response to any maskable events.	This value should
  not  be  combined with other event mask bits, and should not be used to
  select events in other functions.

  If the widget is realized, and no other handler requires events of  any
  of the specified types, XtRemoveEventHandler() calls XSelectInput(), as
  necessary to prevent the widget from receiving further events of  those
  types.

Usage
  Note	that  XtRemoveEventHandler() does not necessarily remove an event
  handler; rather, it modifies the conditions for which it is called.  To
  prevent  an  event handler from being called at all, call XtRemoveEven‐
  tHandler() with an event_mask	 of  XtAllEvents  and  with  nonmaskable
  True.

  To remove or change the event mask for a "raw" event handler registered
  with	 XtAddRawEventHandler()	  or	XtInsertRawEventHandler(),    use
  XtRemoveRawEventHandler().

Structures
  Each	of  the event types listed in the table below set a single bit in
  an event mask.  The event_mask argument is formed  by	 combining  these
  symbols  with	 the  bitwise OR operator ( ).	Note that the nonmaskable
  event types do not appear in this table and cannot be requested  in  an
  event mask.

NoEventMask		Button1MotionMask      StructureNotifyMask
KeyPressMask		Button2MotionMask      ResizeRedirectMask
KeyReleaseMask		Button3MotionMask      SubstructureNotifyMask
ButtonPressMask		Button4MotionMask      SubstructureRedirectMask
ButtonReleaseMask	Button5MotionMask      FocusChangeMask
EnterWindowMask		ButtonMotionMask       PropertyChangeMask
LeaveWindowMask		KeymapStateMask	       ColormapChangeMask
PointerMotionMask	ExposureMask	       OwnerGrabButtonMask
PointerMotionHintMask	VisibilityChangeMask

See  Appendix  C, Event	 Reference,  for  more	information on event types and
masks.

  In addition to these standard X event masks, the  Intrinsics	define	a
  special value for use by this function:

     /* XtAllEvents is valid only for XtRemoveEventHandler and
      * XtRemoveRawEventHandler; don't use it to select events!
      */
     #define XtAllEvents ((EventMask) -1L)

See Also
  XtAddEventHandler(1), XtInsertEventHandler(1), XtRemoveRawEven‐
  tHandler(1),
  XtEventHandler(2).

Xt - Event Handling					XtRemoveEventHandler()
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