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     X Version 11 (1 September 1988)          XtCallCallbacks(Xt)



     NAME
          XtCallCallbacks, XtHasCallbacks - process callbacks


     SYNTAX
          void XtCallCallbacks(w, callback_name, call_data)
                Widget w;
                String callback_name;
                caddr_t call_data;

          typedef enum {XtCallbackNoList, XtCallbackHasNone,
          XtCallbackHasSome} XtCallbackStatus;

          XtCallbackStatus XtHasCallbacks(w, callback_name)
                Widget w;
                String callback_name;


     ARGUMENTS
          callback_name
                    Specifies the callback list to be executed or
                    checked.

          call_data Specifies a callback-list specific data value to
                    pass to each of the callback procedure in the
                    list.

          w         Specifies the widget.


     DESCRIPTION
          The XtCallCallbacks function calls each procedure that is
          registered in the specified widget's callback list.

          The XtHasCallbacks function first checks to see if the
          widget has a callback list identified by callback_name.  If
          the callback list does not exist, XtHasCallbacks returns
          XtCallbackNoList.  If the callback list exists but is empty,
          it returns XtCallbackHasNone.  If the callback list exists
          and has at least one callback registered, it returns
          XtCallbackHasSome.


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


     (printed 2/14/90) (1 September 1988)     XtCallCallbacks(Xt)