XtCallCallbacks(3)

NAME

       XtCallCallbacks, XtCallCallbackList, XtHasCallbacks - process callbacks

SYNTAX

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

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

       typedef enum {XtCallbackNoList, XtCallbackHasNone, XtCallbackHasSome}
       XtCallbackStatus;

       XtCallbackStatus XtHasCallbacks(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 call-
       backs 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 call-
       back 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

X Version 11                      libXt 1.0.5               XtCallCallbacks(3)