XtRemoveEventHandler man page on BSDOS

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XtAddEventHandler(3Xt)	XT FUNCTIONS	XtAddEventHandler(3Xt)

NAME
       XtAddEventHandler, XtAddRawEventHandler, XtRemoveEvent-
       Handler, XtRemoveRawEventHandler, XtInsertEventHandler,
       XtInsertRawEventHandler - add and remove event handlers

SYNTAX
       void XtAddEventHandler(w, event_mask, nonmaskable, proc,
       client_data)
	     Widget w;
	     EventMask event_mask;
	     Boolean nonmaskable;
	     XtEventHandler proc;
	     XtPointer client_data;

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

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

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

       void XtInsertEventHandler(w, event_mask, nonmaskable,
       proc, client_data, position)
	     Widget w;
	     EventMask event_mask;
	     Boolean nonmaskable;
	     XtEventHandler proc;
	     XtPointer client_data;
	     XtListPosition position;

       void XtInsertRawEventHandler(w, event_mask, nonmaskable,
       proc, client_data, position)
	     Widget w;
	     EventMask event_mask;
	     Boolean nonmaskable;
	     XtEventHandler proc;
	     XtPointer client_data;

X Version 11		Release 6.4				1

XtAddEventHandler(3Xt)	XT FUNCTIONS	XtAddEventHandler(3Xt)

	     XtListPosition position;

       typedef enum { XtListHead, XtListTail } XtListPosition;

ARGUMENTS
       client_data
		 Specifies additional data to be passed to the
		 client's event handler.

       event_mask
		 Specifies the event mask for which to call or
		 unregister this procedure.

       nonmaskable
		 Specifies a Boolean value that indicates whether
		 this procedure should be called or removed on
		 the nonmaskable events (GraphicsExpose,
		 NoExpose, SelectionClear, SelectionRequest,
		 SelectionNotify, ClientMessage, and
		 MappingNotify).

       proc	Specifies the procedure that is to be added or
		 removed.

       w	 Specifies the widget for which this event han-
		 dler is being registered.

       position Specifies when the event handler is to be called
		 relative to other previously registered han-
		 dlers.

DESCRIPTION
       The XtAddEventHandler function registers a procedure with
       the dispatch mechanism that is to be called when an event
       that matches the mask occurs on the specified widget.  If
       the procedure is already registered with the same
       client_data, the specified mask is ORed into the existing
       mask.  If the widget is realized, XtAddEventHandler calls
       XSelectInput, if necessary.

       The XtAddRawEventHandler function is similar to XtAdd-
       EventHandler except that it does not affect the widget's
       mask and never causes an XSelectInput for its events.
       Note that the widget might already have those mask bits
       set because of other nonraw event handlers registered on
       it.

       The XtRemoveRawEventHandler function stops the specified
       procedure from receiving the specified events.  Because
       the procedure is a raw event handler, this does not affect
       the widget's mask and never causes a call on XSelectInput.

       XtInsertEventHandler is identical to XtAddEventHandler
       with the additional position argument. if position is

X Version 11		Release 6.4				2

XtAddEventHandler(3Xt)	XT FUNCTIONS	XtAddEventHandler(3Xt)

       XtListHead, the event handler is registered to that it
       will be called before any event handlers that were previ-
       ously registered for the same widget.  If position is
       XtListTail, the event handler is registered to be called
       after any previously registered event handlers. If the
       procedure is already registered with the same client_data
       value, the specified mask augments the existing mask and
       the procedure is repositioned in the list.

       XtInsertRawEventHandler is similar to XtInsertEventHandler
       except that it does not modify the widget's event mask and
       never causes an XSelectInput for the specified events. If
       the procedure is already registered with the same
       client_data value, the specified mask augments the exist-
       ing mask and the procedure is repositioned in the list.

SEE ALSO
       XtAppNextEvent(3Xt), XtBuildEventMask(3Xt)
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

X Version 11		Release 6.4				3

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