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package javafx.beans;

import javafx.beans.value.ObservableValue;

An InvalidationListener is notified whenever an Observable becomes invalid. It can be registered and unregistered with Observable.addListener(InvalidationListener) respectively Observable.removeListener(InvalidationListener). 
 For an in-depth explanation of invalidation events and how they differ from change events, see the documentation of ObservableValue. 
 The same instance of InvalidationListener can be registered to listen to multiple Observables. 
See Also:
Observable
ObservableValue
Since:
JavaFX 2.0/**
 * An {@code InvalidationListener} is notified whenever an
 * {@link Observable} becomes invalid. It can be registered and
 * unregistered with {@link Observable#addListener(InvalidationListener)}
 * respectively {@link Observable#removeListener(InvalidationListener)}.
 * <p>
 * For an in-depth explanation of invalidation events and how they differ from
 * change events, see the documentation of {@code ObservableValue}.
 * <p>
 * The same instance of {@code InvalidationListener} can be registered to listen
 * to multiple {@code Observables}.
 *
 * @see Observable
 * @see ObservableValue
 *
 *
 * @since JavaFX 2.0
 */
@FunctionalInterface
public interface InvalidationListener {

    
This method needs to be provided by an implementation of InvalidationListener. It is called if an Observable becomes invalid. 

In general, it is considered bad practice to modify the observed value in
this method.
Params:
observable –  The Observable that became invalid/**
     * This method needs to be provided by an implementation of
     * {@code InvalidationListener}. It is called if an {@link Observable}
     * becomes invalid.
     * <p>
     * In general, it is considered bad practice to modify the observed value in
     * this method.
     *
     * @param observable
     *            The {@code Observable} that became invalid
     */
    public void invalidated(Observable observable);
}