Line | Hits | Source |
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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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