- All Known Implementing Classes:
WeakChangeListener
- 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 ChangeListener<T>
A
ChangeListener
is notified whenever the value of an
ObservableValue
changes. It can be registered and unregistered with
ObservableValue.addListener(ChangeListener)
respectively
ObservableValue.removeListener(ChangeListener)
For an in-depth explanation of change events and how they differ from
invalidation events, see the documentation of ObservableValue
.
The same instance of ChangeListener
can be registered to listen to
multiple ObservableValues
.
- Since:
- JavaFX 2.0
- See Also:
ObservableValue
-
Method Summary
Modifier and Type Method Description void
changed(ObservableValue<? extends T> observable, T oldValue, T newValue)
Called when the value of anObservableValue
changes.
-
Method Details
-
changed
Called when the value of anObservableValue
changes.In general, it is considered bad practice to modify the observed value in this method.
- Parameters:
observable
- TheObservableValue
which value changedoldValue
- The old valuenewValue
- The new value
-