Top Description Fields Constructors Methods
javafx.beans.value

public abstract Class ObservableValueBase<T>

extends Object
implements ObservableValue<T>
Class Inheritance
All Implemented Interfaces
javafx.beans.value.ObservableValue, javafx.beans.Observable
Type Parameters
<T>
the observable value type
Imports
com.sun.javafx.binding.ExpressionHelper, javafx.beans.InvalidationListener
A convenience class for creating implementations of ObservableValue. It contains all of the infrastructure support for value invalidation- and change event notification. This implementation can handle adding and removing listeners while the observers are being notified, but it is not thread-safe.
Since
JavaFX 2.0

Field Summary

Modifier and TypeField and Description
private ExpressionHelper<T>
helper

Constructor Summary

AccessConstructor and Description
public
ObservableValueBase()

Creates a default ObservableValueBase.

Method Summary

Modifier and TypeMethod and Description
public void
addListener(InvalidationListener
The listener to register
listener)

Implements javafx.beans.Observable.addListener.

Adds an InvalidationListener which will be notified whenever the Observable becomes invalid.

public void
addListener(ChangeListener<? super T>
The listener to register
listener)

Implements javafx.beans.value.ObservableValue.addListener.

Adds a ChangeListener which will be notified whenever the value of the ObservableValue changes.

protected void
fireValueChangedEvent()

Notify the currently registered observers of a value change.

public void
removeListener(InvalidationListener
The listener to remove
listener)

Implements javafx.beans.Observable.removeListener.

Removes the given listener from the list of listeners, that are notified whenever the value of the Observable becomes invalid.

public void
removeListener(ChangeListener<? super T>
The listener to remove
listener)

Implements javafx.beans.value.ObservableValue.removeListener.

Removes the given listener from the list of listeners that are notified whenever the value of the ObservableValue changes.

Inherited from java.lang.Object:
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Field Detail

helperback to summary
private ExpressionHelper<T> helper

Constructor Detail

ObservableValueBaseback to summary
public ObservableValueBase()

Creates a default ObservableValueBase.

Method Detail

addListenerback to summary
public void addListener(InvalidationListener listener)

Implements javafx.beans.Observable.addListener.

Doc from javafx.beans.Observable.addListener.

Adds an InvalidationListener which will be notified whenever the Observable becomes invalid. If the same listener is added more than once, then it will be notified more than once. That is, no check is made to ensure uniqueness.

Note that the same actual InvalidationListener instance may be safely registered for different Observables.

The Observable stores a strong reference to the listener which will prevent the listener from being garbage collected and may result in a memory leak. It is recommended to either unregister a listener by calling removeListener after use or to use an instance of WeakInvalidationListener avoid this situation.

Parameters
listener:InvalidationListener

The listener to register

Annotations
@Override
addListenerback to summary
public void addListener(ChangeListener<? super T> listener)

Implements javafx.beans.value.ObservableValue.addListener.

Doc from javafx.beans.value.ObservableValue.addListener.

Adds a ChangeListener which will be notified whenever the value of the ObservableValue changes. If the same listener is added more than once, then it will be notified more than once. That is, no check is made to ensure uniqueness.

Note that the same actual ChangeListener instance may be safely registered for different ObservableValues.

The ObservableValue stores a strong reference to the listener which will prevent the listener from being garbage collected and may result in a memory leak. It is recommended to either unregister a listener by calling removeListener after use or to use an instance of WeakChangeListener avoid this situation.

Parameters
listener:ChangeListener<? super T>

The listener to register

Annotations
@Override
fireValueChangedEventback to summary
protected void fireValueChangedEvent()

Notify the currently registered observers of a value change. This implementation will ignore all adds and removes of observers that are done while a notification is processed. The changes take effect in the following call to fireValueChangedEvent.

removeListenerback to summary
public void removeListener(InvalidationListener listener)

Implements javafx.beans.Observable.removeListener.

Doc from javafx.beans.Observable.removeListener.

Removes the given listener from the list of listeners, that are notified whenever the value of the Observable becomes invalid.

If the given listener has not been previously registered (i.e. it was never added) then this method call is a no-op. If it had been previously added then it will be removed. If it had been added more than once, then only the first occurrence will be removed.

Parameters
listener:InvalidationListener

The listener to remove

Annotations
@Override
removeListenerback to summary
public void removeListener(ChangeListener<? super T> listener)

Implements javafx.beans.value.ObservableValue.removeListener.

Doc from javafx.beans.value.ObservableValue.removeListener.

Removes the given listener from the list of listeners that are notified whenever the value of the ObservableValue changes.

If the given listener has not been previously registered (i.e. it was never added) then this method call is a no-op. If it had been previously added then it will be removed. If it had been added more than once, then only the first occurrence will be removed.

Parameters
listener:ChangeListener<? super T>

The listener to remove

Annotations
@Override