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CentOS 7.0 - man page for xtremoveraweventhandler (centos section 3)

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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 nonmaskable, XtEventHandler
	      proc, XtPointer client_data);

       void XtAddRawEventHandler(Widget w, EventMask event_mask, Boolean nonmaskable, XtEven-
	      tHandler proc, XtPointer client_data);

       void XtRemoveEventHandler(Widget w, EventMask event_mask, Boolean nonmaskable, XtEven-
	      tHandler proc, XtPointer client_data);

       void XtRemoveRawEventHandler(Widget w, EventMask event_mask, Boolean nonmaskable, XtEven-
	      tHandler proc, XtPointer client_data);

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

       void XtInsertRawEventHandler(Widget w, EventMask event_mask, Boolean nonmaskable, XtEven-
	      tHandler proc, XtPointer client_data, 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 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 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 XtAddEventHandler 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 reg-
       istered 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 argu-
       ment. 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 posi-
       tion is XtListTail, the event handler is registered to be called after any previously reg-
       istered 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 aug-
       ments the existing 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 1.1.4			     XtAddEventHandler(3)
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