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     XtCallCallbacks(3Xt)                    XtCallCallbacks(3Xt)



     NAME
          XtCallCallbacks, XtHasCallbacks - process callbacks

     SYNOPSIS
          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(3Xt)
          X Toolkit Intrinsics Programming Manual
          Xlib Programming Manual












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