IObservableValue (Eclipse Platform API Specification)

Type Parameters:

T - type of the value of the property

All Superinterfaces:

IObservable

All Known Subinterfaces:

ISWTObservableValue<T>, IVetoableValue<T>, IViewerObservableValue<T>

All Known Implementing Classes:

AbstractObservableValue, AbstractVetoableValue, AggregateValidationStatus, ComputedValue, DateAndTimeObservableValue, DecoratingObservableValue, DecoratingVetoableValue, DuplexingObservableValue, LocalDateTimeObservableValue, SelectObservableValue, WritableValue
```
public interface IObservableValue<T>
extends IObservable
```
A value whose changes can be tracked by value change listeners.

Since:

1.0

See Also:

AbstractObservableValue

Restriction:

This interface is not intended to be implemented by clients. Clients should instead subclass one of the classes that implement this interface.
Authors of extensions to the databinding framework may extend this interface and indirectly implement it, but if doing so must also extend one of the framework classes. (Use an API problem filter to suppress the resulting warning.)
Direct implementers of this interface outside of the framework will be broken in future releases when methods are added to this interface.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addValueChangeListener(IValueChangeListener<? super T> listener)`
`T`	`getValue()`	Returns the value.
`Object`	`getValueType()`	The value type of this observable value, or `null` if this observable value is untyped.
`void`	`removeValueChangeListener(IValueChangeListener<? super T> listener)`
`void`	`setValue(T value)`	Sets the value.

Methods inherited from interface org.eclipse.core.databinding.observable.IObservable
addChangeListener, addDisposeListener, addStaleListener, dispose, getRealm, isDisposed, isStale, removeChangeListener, removeDisposeListener, removeStaleListener

- Method Detail
  - getValueType
```
Object getValueType()
```
    The value type of this observable value, or null if this observable value is untyped.
    
    Returns:
    
    the value type, or null
  - getValue
```
T getValue()
```
    Returns the value. Must be invoked in the Realm of the observable.
    
    Returns:
    
    the current value
    
    "TrackedGetter"
  - setValue
```
void setValue(T value)
```
    Sets the value. Must be invoked in the Realm of the observable.
    
    Parameters:
    
    value - the value to set
    
    Throws:
    
    UnsupportedOperationException - if this observable value cannot be set.
  - addValueChangeListener
```
void addValueChangeListener(IValueChangeListener<? super T> listener)
```
    Parameters:
    
    listener - the change listener to add; not null
  - removeValueChangeListener
```
void removeValueChangeListener(IValueChangeListener<? super T> listener)
```
    Parameters:
    
    listener - the change listener to remove; not null