- All Known Subinterfaces:
Binding<T>
,JavaBeanProperty<T>
,NumberBinding
,NumberExpression
,ObservableArray<T>
,ObservableBooleanValue
,ObservableDoubleValue
,ObservableFaceArray
,ObservableFloatArray
,ObservableFloatValue
,ObservableIntegerArray
,ObservableIntegerValue
,ObservableList<E>
,ObservableListValue<E>
,ObservableLongValue
,ObservableMap<K,V>
,ObservableMapValue<K,V>
,ObservableNumberValue
,ObservableObjectValue<T>
,ObservableSet<E>
,ObservableSetValue<E>
,ObservableStringValue
,ObservableValue<T>
,Property<T>
,ReadOnlyJavaBeanProperty<T>
,ReadOnlyProperty<T>
,TextInputControl.Content
,WritableListValue<E>
,WritableMapValue<K,V>
,WritableSetValue<E>
- All Known Implementing Classes:
BooleanBinding
,BooleanExpression
,BooleanProperty
,BooleanPropertyBase
,DoubleBinding
,DoubleExpression
,DoubleProperty
,DoublePropertyBase
,FilteredList
,FloatBinding
,FloatExpression
,FloatProperty
,FloatPropertyBase
,IntegerBinding
,IntegerExpression
,IntegerProperty
,IntegerPropertyBase
,JavaBeanBooleanProperty
,JavaBeanDoubleProperty
,JavaBeanFloatProperty
,JavaBeanIntegerProperty
,JavaBeanLongProperty
,JavaBeanObjectProperty
,JavaBeanStringProperty
,ListBinding
,ListExpression
,ListProperty
,ListPropertyBase
,LongBinding
,LongExpression
,LongProperty
,LongPropertyBase
,MapBinding
,MapExpression
,MapProperty
,MapPropertyBase
,ModifiableObservableListBase
,NumberExpressionBase
,ObjectBinding
,ObjectExpression
,ObjectProperty
,ObjectPropertyBase
,ObservableArrayBase
,ObservableListBase
,ObservableValueBase
,ReadOnlyBooleanProperty
,ReadOnlyBooleanPropertyBase
,ReadOnlyBooleanWrapper
,ReadOnlyDoubleProperty
,ReadOnlyDoublePropertyBase
,ReadOnlyDoubleWrapper
,ReadOnlyFloatProperty
,ReadOnlyFloatPropertyBase
,ReadOnlyFloatWrapper
,ReadOnlyIntegerProperty
,ReadOnlyIntegerPropertyBase
,ReadOnlyIntegerWrapper
,ReadOnlyJavaBeanBooleanProperty
,ReadOnlyJavaBeanDoubleProperty
,ReadOnlyJavaBeanFloatProperty
,ReadOnlyJavaBeanIntegerProperty
,ReadOnlyJavaBeanLongProperty
,ReadOnlyJavaBeanObjectProperty
,ReadOnlyJavaBeanStringProperty
,ReadOnlyListProperty
,ReadOnlyListPropertyBase
,ReadOnlyListWrapper
,ReadOnlyLongProperty
,ReadOnlyLongPropertyBase
,ReadOnlyLongWrapper
,ReadOnlyMapProperty
,ReadOnlyMapPropertyBase
,ReadOnlyMapWrapper
,ReadOnlyObjectProperty
,ReadOnlyObjectPropertyBase
,ReadOnlyObjectWrapper
,ReadOnlySetProperty
,ReadOnlySetPropertyBase
,ReadOnlySetWrapper
,ReadOnlyStringProperty
,ReadOnlyStringPropertyBase
,ReadOnlyStringWrapper
,SetBinding
,SetExpression
,SetProperty
,SetPropertyBase
,SimpleBooleanProperty
,SimpleDoubleProperty
,SimpleFloatProperty
,SimpleIntegerProperty
,SimpleListProperty
,SimpleLongProperty
,SimpleMapProperty
,SimpleObjectProperty
,SimpleSetProperty
,SimpleStringProperty
,SimpleStyleableBooleanProperty
,SimpleStyleableDoubleProperty
,SimpleStyleableFloatProperty
,SimpleStyleableIntegerProperty
,SimpleStyleableLongProperty
,SimpleStyleableObjectProperty
,SimpleStyleableStringProperty
,SortedList
,StringBinding
,StringExpression
,StringProperty
,StringPropertyBase
,StyleableBooleanProperty
,StyleableDoubleProperty
,StyleableFloatProperty
,StyleableIntegerProperty
,StyleableLongProperty
,StyleableObjectProperty
,StyleableStringProperty
,TransformationList
public interface Observable
Observable
is an entity that wraps content and allows to
observe the content for invalidations.
An implementation of Observable
may support lazy evaluation,
which means that the content is not immediately recomputed after changes, but
lazily the next time it is requested. All bindings and properties in
this library support lazy evaluation.
Implementations of this class should strive to generate as few events as possible to avoid wasting too much time in event handlers. Implementations in this library mark themselves as invalid when the first invalidation event occurs. They do not generate anymore invalidation events until their value is recomputed and valid again.
- Since:
- JavaFX 2.0
- See Also:
ObservableValue
,ObservableList
,ObservableMap
-
Method Summary
Modifier and Type Method Description void
addListener(InvalidationListener listener)
Adds anInvalidationListener
which will be notified whenever theObservable
becomes invalid.void
removeListener(InvalidationListener listener)
Removes the given listener from the list of listeners, that are notified whenever the value of theObservable
becomes invalid.
-
Method Details
-
addListener
Adds anInvalidationListener
which will be notified whenever theObservable
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 differentObservables
.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 callingremoveListener
after use or to use an instance ofWeakInvalidationListener
avoid this situation.- Parameters:
listener
- The listener to register- Throws:
NullPointerException
- if the listener is null- See Also:
removeListener(InvalidationListener)
-
removeListener
Removes the given listener from the list of listeners, that are notified whenever the value of theObservable
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
- The listener to remove- Throws:
NullPointerException
- if the listener is null- See Also:
addListener(InvalidationListener)
-