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XtCallCallbacks(3Xt)
X11R6
NAME
  XtCallCallbacks, XtCallCallbacks, XtCallCallbackList, XtHasCallbacks -
  process callbacks

SYNOPSIS
  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, 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.

  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(3Xt)

  X Toolkit Intrinsics -- C Language Interface

  Xlib -- C Language X Interface

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