[interface-discuss] XContainerApproveBroadcaster/-Listener

[Frank Schönheit - Sun Microsystems Germa ny]

I current have the need to observe, and possibly veto, changes done to a
generic container of objects.

While observation isn't a problem (the container supports XContainer),
vetoing is: There seems to be no appropriate interface which allows me
to hook in.


While I could easily use some XUnoTunnel/getImplementation stuff - both
the container an its clients are in my own responsibility -, I'd like to
have a more generic solution.

Can anybody think of any existing interface which might be helpful?

If not, what about (iow: any objections against) introducing the
following in udkapi, module css.container:

  interface XContainerBroadcaster
  {
    addContainerApproveListener(
      [in] XContainerApproveListener Listener );

    removeContainerApproveListener(
      [in] XContainerApproveListener Listener );
  };

  interface XContainerApproveListener
  {
    void approveInsertElement( [in] ContainerEvent Event )
      raises ( VetoException, WrappedTargetException );

    void approveReplaceElement( [in] ContainerEvent Event )
      raises ( VetoException, WrappedTargetException );

    void approveRemoveElement( [in] ContainerEvent Event )
      raises ( VetoException, WrappedTargetException );
  };


?

Thanks & Ciao
Frank


-- 
- Frank Schönheit, Software Engineer         [EMAIL PROTECTED] -
- Sun Microsystems                      http://www.sun.com/staroffice -
- OpenOffice.org Database                   http://dba.openoffice.org -
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