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SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
Interface for objects which listen to ChangeEvents.
Nested Class Summary | |
static class |
ChangeListener.AlwaysVetoListener
An implementation that always vetoes everything. |
static class |
ChangeListener.LoggingListener
A listener that writes information about the event stream to a PrintStream. |
Field Summary | |
static ChangeListener |
ALWAYS_VETO
Convenience implementation which vetoes every change of which it is notified. |
static ChangeListener |
LOG_TO_OUT
Convenience implementation that echoes all events to out. |
Method Summary | |
void |
postChange(ChangeEvent cev)
Called when a change has just taken place. |
void |
preChange(ChangeEvent cev)
Called before a change takes place. |
Field Detail |
public static final ChangeListener ALWAYS_VETO
public static final ChangeListener LOG_TO_OUT
Method Detail |
public void preChange(ChangeEvent cev) throws ChangeVetoException
Called before a change takes place.
This is your chance to stop the change by throwing a ChangeVetoException. This method does not indicate that the change will definitely take place, so it is not recomended that you take any positive action within this handler.
cev
- An event encapsulating the change which is about
to take place.
ChangeVetoException
- Description of Exception
ChangeVetoException
- if the receiver does not wish
this change to occur at this
time.public void postChange(ChangeEvent cev)
Called when a change has just taken place.
This method is the place to perform any behavior in response to the change event.
cev
- An event encapsulating the change which has
occured.
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