A {@link QueryListener} can be attached to a {@link FluidGridLayout} to get notified when a specific{@link Query} was activated or deactivated. This is often used to exchange UI elements when the screen size changes.
Listener interface for changes in the query box.
@author Edward A. Lee
@version $Id: QueryListener.java,v 1.14 2005/07/08 19:59:08 cxh Exp $
@since Ptolemy II 0.3
@Pt.ProposedRating Red (eal)
@Pt.AcceptedRating Red (eal)
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