XtCallCallbacks(Xt)

Syntax

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;

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.

Description

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

X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface