XtCallCallbacks, XtCallCallbackList, XtHasCallbacks - process callbacks

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.

       callbacks Specifies the callback list to be executed.

       w         Specifies the widget.

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

       If  callbacks  is not NULL, XtCallCallbackList calls each of the callback procedures in the list, passing
       client data and call_data. The callbacks parameter must specify  the  contents  of  a  widget  or  object
       resource declared with representation type XtRCallback.

       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.

       XtCallCallbacks, XtCallCallbackList, XtHasCallbacks - process callbacks

XtAddCallback(3)
       XToolkitIntrinsics-CLanguageInterfaceXlib-CLanguageXInterface

X Version 11                                       libXt 1.2.1                                XtCallCallbacks(3)

       #include <X11/Intrinsic.h>

       void XtCallCallbacks(Widget w, const char *callback_name, XtPointer call_data);

       void XtCallCallbackList(Widget w, XtCallbackList callbacks, XtPointer call_data);

       typedef enum {XtCallbackNoList, XtCallbackHasNone, XtCallbackHasSome} XtCallbackStatus;

       XtCallbackStatus XtHasCallbacks(Widget w, const char *callback_name);