NAME

       XtAddCallback, XtAddCallbacks, XtRemoveCallback, XtRemoveCallbacks, XtRemoveAllCallbacks -
       add and remove callback procedures

SYNTAX

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

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

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

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

       void XtRemoveAllCallbacks(Widget w, String callback_name,

ARGUMENTS

       callback  Specifies the callback procedure.

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

       callback_name
                 Specifies the callback list to which the procedure is to be appended or deleted.

       client_data
                 Specifies the argument that is to be passed to the specified procedure when it
                 is invoked by XtCallbacks or NULL, or the client data to match on the registered
                 callback procedures.

       w         Specifies the widget.

DESCRIPTION

       The XtAddCallback function adds the specified callback procedure to the specified widget's
       callback list.

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