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 XtCallCallbacks(Xt)      X Version 11 (Release 5)        XtCallCallbacks(Xt)
                                6 January 1993


 Name

    XtCallCallbacks - process callbacks

 Syntax


    void XtCallCallbacks(w, callback_name, call_data)
    Widget w;
    String callback_name;
    XtPointer call_data;

    typedef enum {XtCallbackNoList, XtCallbackHasNone, XtCallbackHasSome}
                  XtCallbackStatus;

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


 Arguments

    callbackname
              Specifies the callback list to be executed or checked.

    calldata 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 call-
    back list identified by callbackname.  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 XtCallback-
    HasSome.

 See also

    XtAddCallback(Xt)

    X Toolkit Intrinsics - C Language Interface
    Xlib - C Language X Interface