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 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.

SEE ALSO

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