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XtAddEventHandler(3)		 XT FUNCTIONS		  XtAddEventHandler(3)

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

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

       void XtAddRawEventHandler(Widget	w, EventMask event_mask, Boolean non-
	      maskable,	XtEventHandler proc, XtPointer client_data);

       void XtRemoveEventHandler(Widget	w, EventMask event_mask, Boolean non-
	      maskable,	XtEventHandler proc, XtPointer client_data);

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

       void XtInsertEventHandler(Widget	w, EventMask event_mask, Boolean non-
	      maskable,	XtEventHandler proc, XtPointer client_data, XtListPo-
	      sition position);

       void XtInsertRawEventHandler(Widget w, EventMask	event_mask, Boolean
	      nonmaskable, XtEventHandler proc,	XtPointer client_data, XtList-
	      Position 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 proce-
		 dure 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 handler is being
		 registered.

       position	 Specifies when	the event handler is to	be called relative to
		 other previously registered handlers.

DESCRIPTION
       The XtAddEventHandler function registers	a procedure with the dispatch
       mechanism that is to be called when an event that matches the mask oc-
       curs 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 XtAddEventHandler ex-
       cept that it does not affect the	widget's mask and never	causes an XSe-
       lectInput 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 addi-
       tional position argument. if position is	XtListHead, the	event handler
       is registered to	that it	will be	called before any event	handlers that
       were previously registered for the same widget.	If position is XtList-
       Tail, 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 XSelect-
       Input 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(3), XtBuildEventMask(3)
       X Toolkit Intrinsics - C	Language Interface
       Xlib - C	Language X Interface

X Version 11			  libXt	1.1.5		  XtAddEventHandler(3)

NAME | SYNTAX | ARGUMENTS | DESCRIPTION | SEE ALSO

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