Module javafx.base
Package javafx.beans

Interface Observable

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
An 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:

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    addListener(InvalidationListener listener)
    Adds an InvalidationListener which will be notified whenever the Observable becomes invalid.
    void
    removeListener(InvalidationListener listener)
    Removes the given listener from the list of listeners, that are notified whenever the value of the Observable becomes invalid.
    default Subscription
    subscribe(Runnable invalidationSubscriber)
    Creates a Subscription on this Observable which calls invalidationSubscriber whenever it becomes invalid.

  • Method Details

    • addListener

      void addListener(InvalidationListener listener)
      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 - The listener to register
      Throws:
      NullPointerException - if the listener is null
      See Also:

    • removeListener

      void removeListener(InvalidationListener listener)
      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 - The listener to remove
      Throws:
      NullPointerException - if the listener is null
      See Also:

    • subscribe

      default Subscription subscribe(Runnable invalidationSubscriber)
      Creates a Subscription on this Observable which calls invalidationSubscriber whenever it becomes invalid. The provided subscriber is akin to an InvalidationListener without the Observable parameter. If the same subscriber is subscribed more than once, then it will be notified more than once. That is, no check is made to ensure uniqueness.

      Note that the same subscriber instance may be safely subscribed for different Observables.

      Also note that when subscribing on an Observable with a longer lifecycle than the subscriber, the subscriber must be unsubscribed when no longer needed as the subscription will otherwise keep the subscriber from being garbage collected.

      Parameters:
      invalidationSubscriber - a Runnable to call whenever this value becomes invalid, cannot be null
      Returns:
      a Subscription which can be used to cancel this subscription, never null
      Throws:
      NullPointerException - if the subscriber is null
      Since:
      21
      See Also: