XtCallCallbacks(3Xt)

NAME
       XtCallCallbacks, XtCallCallbackList, XtHasCallbacks - pro-
       cess callbacks

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

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

       typedef enum {XtCallbackNoList, XtCallbackHasNone, XtCall-
       backHasSome} 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.

       callbacks Specifies the callback list to be executed.

       w         Specifies the widget.

DESCRIPTION
       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 rep-
       resentation 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.

SEE ALSO
       XtAddCallback(3Xt) 
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface