| Line | Hits | Source |
|---|---|---|
| 1 | /* | |
| 2 | * Copyright (c) 2005, the JUNG Project and the Regents of the University of | |
| 3 | * California All rights reserved. | |
| 4 | * | |
| 5 | * This software is open-source under the BSD license; see either "license.txt" | |
| 6 | * or http://jung.sourceforge.net/license.txt for a description. | |
| 7 | * | |
| 8 | * Created on Aug 18, 2005 | |
| 9 | */ | |
| 10 | ||
| 11 | package edu.uci.ics.jung.utils; | |
| 12 | ||
| 13 | import javax.swing.event.ChangeEvent; | |
| 14 | import javax.swing.event.ChangeListener; | |
| 15 | import javax.swing.event.EventListenerList; | |
| 16 | ||
| 17 | public class DefaultChangeEventSupport implements ChangeEventSupport { | |
| 18 | ||
| 19 | Object eventSource; | |
| 20 | /** | |
| 21 | * holds the registered listeners | |
| 22 | */ | |
| 23 | 18 | protected EventListenerList listenerList = new EventListenerList(); |
| 24 | ||
| 25 | /** | |
| 26 | * Only one <code>ChangeEvent</code> is needed | |
| 27 | * instance since the | |
| 28 | * event's only state is the source property. The source of events | |
| 29 | * generated is always "this". | |
| 30 | */ | |
| 31 | protected transient ChangeEvent changeEvent; | |
| 32 | ||
| 33 | 18 | public DefaultChangeEventSupport(Object eventSource) { |
| 34 | 18 | this.eventSource = eventSource; |
| 35 | 18 | } |
| 36 | ||
| 37 | /* (non-Javadoc) | |
| 38 | * @see edu.uci.ics.jung.utils.ChangeEventSupport#addChangeListener(javax.swing.event.ChangeListener) | |
| 39 | */ | |
| 40 | public void addChangeListener(ChangeListener l) { | |
| 41 | 0 | listenerList.add(ChangeListener.class, l); |
| 42 | 0 | } |
| 43 | ||
| 44 | /* (non-Javadoc) | |
| 45 | * @see edu.uci.ics.jung.utils.ChangeEventSupport#removeChangeListener(javax.swing.event.ChangeListener) | |
| 46 | */ | |
| 47 | public void removeChangeListener(ChangeListener l) { | |
| 48 | 0 | listenerList.remove(ChangeListener.class, l); |
| 49 | 0 | } |
| 50 | ||
| 51 | /* (non-Javadoc) | |
| 52 | * @see edu.uci.ics.jung.utils.ChangeEventSupport#getChangeListeners() | |
| 53 | */ | |
| 54 | public ChangeListener[] getChangeListeners() { | |
| 55 | 0 | return (ChangeListener[])(listenerList.getListeners( |
| 56 | ChangeListener.class)); | |
| 57 | } | |
| 58 | ||
| 59 | /** | |
| 60 | * Notifies all listeners that have registered interest for | |
| 61 | * notification on this event type. The event instance | |
| 62 | * is lazily created. | |
| 63 | * The primary listeners will be views that need to be repainted | |
| 64 | * because of changes in this model instance | |
| 65 | * @see EventListenerList | |
| 66 | */ | |
| 67 | public void fireStateChanged() { | |
| 68 | // Guaranteed to return a non-null array | |
| 69 | 100 | Object[] listeners = listenerList.getListenerList(); |
| 70 | // Process the listeners last to first, notifying | |
| 71 | // those that are interested in this event | |
| 72 | 100 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 73 | 0 | if (listeners[i]==ChangeListener.class) { |
| 74 | // Lazily create the event: | |
| 75 | 0 | if (changeEvent == null) |
| 76 | 0 | changeEvent = new ChangeEvent(eventSource); |
| 77 | 0 | ((ChangeListener)listeners[i+1]).stateChanged(changeEvent); |
| 78 | } | |
| 79 | } | |
| 80 | 100 | } |
| 81 | ||
| 82 | } |
|
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