XtAddCallback(3Xt)                             XtAddCallback(3Xt)



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

SYNOPSIS
     void XtAddCallback(w, callback-name, callback, client-data)
     Widget w;
     String callback-name;
     XtCallbackProc callback;
     XtPointer client-data;

     void XtAddCallbacks(w, callback-name, callbacks)
     Widget w;
     String callback-name;
     XtCallbackList callbacks;

     void XtRemoveCallback(w, callback-name, callback, client-
     data)
     Widget w;
     String callback-name;
     XtCallbackProc callback;
     XtPointer client-data;

     void XtRemoveCallbacks(w, callback-name, callbacks)
     Widget w;
     String callback-name;
     XtCallbackList callbacks;

     void XtRemoveAllCallbacks(w, callback-name)
     Widget w;
     String callback-name;

DESCRIPTION
     The XtAddCallback function adds the specified callback pro-
     cedure 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 call-
     back procedures from the specified widget's callback list.

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

   Arguments
     These functions accept the following arguments:




November, 1990                                                  1

XtAddCallback(3Xt)                             XtAddCallback(3Xt)



     callback
             Specifies the callback procedure.

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

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

     client-data
             For XtAddCallback, specifies the argument that is to
             be passed to the specified procedure when it is in-
             voked by XtCallCallback, or NULL.  For
             XtRemoveCallback, specifies the client data to match
             on the registered callback procedure.

     w       Specifies the widget.

SEE ALSO
     XtCallCallbacks(3Xt)

     X Toolkit Intrinsics - C Language Interface

     Xlib - C Language Interface






























2                                                  November, 1990