edu.uci.ics.jung.visualization.util
Class DefaultChangeEventSupport

java.lang.Object
  edu.uci.ics.jung.visualization.util.DefaultChangeEventSupport

All Implemented Interfaces:

ChangeEventSupport

public class DefaultChangeEventSupport
extends Object
implements ChangeEventSupport

Basic implementation of ChangeEventSupport, using standard jdk classes

Author:

Tom Nelson - tomnelson@dev.java.net

Field Summary

protected ChangeEvent	changeEvent Only one ChangeEvent is needed instance since the event's only state is the source property.
protected EventListenerList	listenerList holds the registered listeners

Constructor Summary

DefaultChangeEventSupport(Object eventSource)

Method Summary

void	addChangeListener(ChangeListener l)
void	fireStateChanged() Notifies all listeners that have registered interest for notification on this event type.
ChangeListener[]	getChangeListeners() Returns an array of all the ChangeListeners added with addChangeListener().
void	removeChangeListener(ChangeListener l) Removes a ChangeListener.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

listenerList

protected EventListenerList listenerList

holds the registered listeners

changeEvent

protected transient ChangeEvent changeEvent

Only one ChangeEvent is needed instance since the event's only state is the source property. The source of events generated is always "this".

Constructor Detail

DefaultChangeEventSupport

public DefaultChangeEventSupport(Object eventSource)

Method Detail

addChangeListener

public void addChangeListener(ChangeListener l)

Specified by:

addChangeListener in interface ChangeEventSupport

removeChangeListener

public void removeChangeListener(ChangeListener l)

Description copied from interface: ChangeEventSupport

Removes a ChangeListener.

Specified by:

removeChangeListener in interface ChangeEventSupport

Parameters:

l - the listener to be removed

getChangeListeners

public ChangeListener[] getChangeListeners()

Description copied from interface: ChangeEventSupport

Returns an array of all the ChangeListeners added with addChangeListener().

Specified by:

getChangeListeners in interface ChangeEventSupport

Returns:

all of the ChangeListeners added or an empty array if no listeners have been added

fireStateChanged

public void fireStateChanged()

Notifies all listeners that have registered interest for notification on this event type. The event instance is lazily created. The primary listeners will be views that need to be repainted because of changes in this model instance

Specified by:

fireStateChanged in interface ChangeEventSupport

See Also:

EventListenerList