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 module com {  module sun {  module star {  module form {


/** used to listen on objects which allow updating their data.
    <p>In addition to just get notified when a data update happened, the listener
    has a chance to veto updates <em>before</em> they happen.</p>

    @see XUpdateBroadcaster
 */
published interface XUpdateListener: com::sun::star::lang::XEventListener
{

    /** is invoked to check the current data.

        <p>For a given update process, if one of the XUpdateListeners
        vetoes the change, the update is canceled, and no further notification happens.</p>

        @param aEvent
            An event descriptor specifying the broadcaster of the change.

        @returns
            `TRUE` when the update was approved, otherwise `FALSE`.
     */
    boolean approveUpdate( [in] com::sun::star::lang::EventObject aEvent );


    /** is invoked when an object has finished processing the updates and
        the data has been successfully written.

        @param aEvent
            A event descriptor specifying the broadcaster of the change.
     */
    void updated( [in] com::sun::star::lang::EventObject aEvent );

};


}; }; }; };

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