package prefuse.data.event;
import java.util.EventListener;
import prefuse.data.expression.Expression;
/**
* Listener interface for monitoring changes to an Expression instance.
*
* @author <a href="http://jheer.org">jeffrey heer</a>
*/
public interface ExpressionListener extends EventListener {
/**
* Notification that an Expression instance has been modified in some way.
* @param expr the modified expression
*/
public void expressionChanged(Expression expr);
} // end of interface ExpressionListener