XtAddCallback(3Xt)

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

SYNTAX
       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;

ARGUMENTS
       callback  Specifies the callback procedure.

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

       callback_name
                 Specifies the callback list to which the proce-
                 dure is to be appended or deleted.

       client_data
                 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 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.

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