Package javafx.beans

Interface InvalidationListener

All Known Implementing Classes:

BindingHelperObserver, WeakInvalidationListener

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface InvalidationListener

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.

Since:

JavaFX 2.0

See Also:

• Observable
• ObservableValue

Method Summary

Modifier and Type	Method	Description
void	invalidated(Observable observable)	This method needs to be provided by an implementation of InvalidationListener.

Method Details

invalidated

void invalidated(Observable observable)

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

In general is is considered bad practice to modify the observed value in this method.

Parameters:

observable - The Observable that became invalid