XtAddCallback(3Xt)            SDK X11 R4.11MU05           XtAddCallback(3Xt)


NAME
       XtAddCallback, XtAddCallbacks, XtRemoveCallback, XtRemoveCallbacks,
       XtRemoveAllCallbacks - add and remove callback procedures

SYNTAX
       void XtAddCallback(w, callbackname, callback, clientdata)
             Widget w;
             String callbackname;
             XtCallbackProc callback;
             XtPointer clientdata;

       void XtAddCallbacks(w, callbackname, callbacks)
             Widget w;
             String callbackname;
             XtCallbackList callbacks;

       void XtRemoveCallback(w, callbackname, callback, clientdata)
             Widget w;
             String callbackname;
             XtCallbackProc callback;
             XtPointer clientdata;

       void XtRemoveCallbacks(w, callbackname, callbacks)
             Widget w;
             String callbackname;
             XtCallbackList callbacks;

       void XtRemoveAllCallbacks(w, callbackname)
             Widget w;
             String callbackname;

ARGUMENTS
       callback  Specifies the callback procedure.

       callbacks Specifies the null-terminated list of callback procedures
                 and corresponding client data.

       callbackname
                 Specifies the callback list to which the procedure is to be
                 appended or deleted.

       clientdata
                 Specifies the argument that is to be passed to the
                 specified procedure when it is invoked by XtCallbacks or
                 NULL, or the client data to match on the registered
                 callback procedures.

       w         Specifies the widget.

DESCRIPTION
       The XtAddCallback function adds the specified callback procedure to
       the specified widget's callback list.

       The XtAddCallbacks add the specified list of callbacks to the
       specified widget's callback list.

       The XtRemoveCallback function removes a callback only if both the
       procedure and the client data match.

       The XtRemoveCallbacks function removes the specified callback
       procedures from the specified widget's callback list.

       The XtRemoveAllCallbacks function removes all the callback procedures
       from the specified widget's callback list.

SEE ALSO
       XtCallCallbacks(3Xt)
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface


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