InvalidationListener (JavaFX 12)

All Known Implementing Classes:

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

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

- Method Detail
  - 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, it is considered bad practice to modify the observed value in this method.
    
    Parameters:
    
    observable - The Observable that became invalid