XtAddCallback(3Xt)          X Version 11(Release 3)          XtAddCallback(3Xt)


NAME
      XtAddCallback, XtAddCallbacks, XtRemoveCallback, XtRemoveCallbacks,
      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 procedure 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.



10/89                                                                    Page 1

XtAddCallback(3Xt)          X Version 11(Release 3)          XtAddCallback(3Xt)


      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






































Page 2                                                                    10/89