XtCallCallbacks(3Xt)                         XtCallCallbacks(3Xt)



NAME
     XtCallCallbacks, XtHasCallbacks - process callbacks

SYNOPSIS
     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;

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 widg-
     et 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.

   Arguments
     These functions accept the following 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.

SEE ALSO
     XtAddCallback(3Xt)

     X Toolkit Intrinsics - C Language Interface

     Xlib - C Language Interface









November, 1990                                                  1