public class PropertyChangeEvent extends EventObject
This concrete class was designed to be instantiated, but may also be subclassed if required.
The JFace frameworks contain classes that report property
change events for internal state changes that may be of interest
to external parties. A special listener interface
(IPropertyChangeListener
) is defined for this purpose,
and a typical class allow listeners to be registered via
an addPropertyChangeListener
method.
IPropertyChangeListener
,
Serialized Formsource
Constructor and Description |
---|
PropertyChangeEvent(Object source,
String property,
Object oldValue,
Object newValue)
Creates a new property change event.
|
Modifier and Type | Method and Description |
---|---|
Object |
getNewValue()
Returns the new value of the property.
|
Object |
getOldValue()
Returns the old value of the property.
|
String |
getProperty()
Returns the name of the property that changed.
|
getSource, toString
public PropertyChangeEvent(Object source, String property, Object oldValue, Object newValue)
source
- the object whose property has changedproperty
- the property that has changed (must not be null
)oldValue
- the old value of the property, or null
if nonenewValue
- the new value of the property, or null
if nonepublic Object getNewValue()
null
if not known
or not relevant (for instance if the property was removed).public Object getOldValue()
null
if not known
or not relevant (for instance if the property was just
added and there was no old value).public String getProperty()
Warning: there is no guarantee that the property name returned is a constant string. Callers must compare property names using equals, not ==.
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