01: package prefuse.data.event;
02:
03: import java.util.EventListener;
04:
05: import prefuse.data.expression.Expression;
06:
07: /**
08: * Listener interface for monitoring changes to an Expression instance.
09: *
10: * @author <a href="http://jheer.org">jeffrey heer</a>
11: */
12: public interface ExpressionListener extends EventListener {
13:
14: /**
15: * Notification that an Expression instance has been modified in some way.
16: * @param expr the modified expression
17: */
18: public void expressionChanged(Expression expr);
19:
20: } // end of interface ExpressionListener
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