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 XtAddCallback(Xt) X Version 11 (Release 5) 6 January 1993  XtAddCallback(Xt)


 Name

    XtAddCallback - add and remove callback procedures

 Syntax


    void XtAddCallback(w, callback_name, callback, client_data)
    Widget w;
    String callback_name;
    XtCallbackProc callback;
    XtPointer client_data;

    void XtAddCallbacks(w, callback_name, callbacks)
    Widget w;
    String callback_name;
    XtCallbackList callbacks;

    void XtRemoveCallback(w, callback_name, callback, client_data)
    Widget w;
    String callback_name;
    XtCallbackProc callback;
    XtPointer client_data;

    void XtRemoveCallbacks(w, callback_name, callbacks)
    Widget w;
    String callback_name;
    XtCallbackList callbacks;

    void XtRemoveAllCallbacks(w, callback_name)
    Widget w;
    String callback_name;


 Arguments

    callback  Specifies the callback procedure.

    callbacks Specifies the null-terminated list of callback procedures and
              corresponding client data.

    callbackname
              Specifies the callback list to which the procedure is to be
              appended or deleted.  or the client data to match on the
              registered callback procedures.

    clientdata
              Specifies the argument that is to be passed to the specified
              procedure when it is invoked by XtCallbacks or NULL.

    w         Specifies the widget.

 Description

    The XtAddCallback function adds the specified callback procedure to the
    specified widget's callback list. XtAddCallback has been superceded by
    XtSetTypeConverter.

    The XtAddCallbacks add the specified list of callbacks to the specified
    widget's callback list.

    The XtRemoveCallback function removes a callback only if both the pro-
    cedure and the client data match.

    The XtRemoveCallbacks function removes the specified callback procedures
    from the specified widget's callback list.

    The XtRemoveAllCallbacks function removes all the callback procedures
    from the specified widget's callback list.

 See also

    XtCallCallbacks(Xt)

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