|
Eclipse Platform 2.0 |
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object | +--java.util.EventObject | +--org.eclipse.jface.util.PropertyChangeEvent
An event object describing a change to a named property.
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 FormField Summary |
Fields inherited from class java.util.EventObject |
source |
Constructor Summary | |
PropertyChangeEvent(Object source,
String property,
Object oldValue,
Object newValue)
Creates a new property change event. |
Method Summary | |
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. |
Methods inherited from class java.util.EventObject |
getSource, toString |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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 noneMethod Detail |
public Object getNewValue()
null
if not known
or not relevantpublic Object getOldValue()
null
if not known
or not relevantpublic String getProperty()
Warning: there is no guarantee that the property name returned is a constant string. Callers must compare property names using equals, not ==.
|
Eclipse Platform 2.0 |
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |