Name

XtCallCallbacks, XtHasCallbacks − process callbacks

Syntax

void XtCallCallbacks(w, callback_name, call_data)
      Widget w;
      String callback_name;
      caddr_t 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_dataSpecifies a callback list-specific data value to pass to each of the callback procedure in the list. 

wSpecifies the widget. 

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 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)
Guide to the XUI Toolkit Intrinsics
Guide to the Xlib Library