@FunctionalInterface public interface ChangeListener<T>
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
.
ObservableValue
Modifier and Type | Method and Description |
---|---|
void |
changed(ObservableValue<? extends T> observable,
T oldValue,
T newValue)
This method needs to be provided by an implementation of
ChangeListener . |
void changed(ObservableValue<? extends T> observable, T oldValue, T newValue)
ChangeListener
. It is called if the value of an
ObservableValue
changes.
In general is is considered bad practice to modify the observed value in this method.
observable
- The ObservableValue
which value changedoldValue
- The old valuenewValue
- The new valueCopyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.