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1
29
30 package nextapp.echo2.app.list;
31
32 import java.io.Serializable  ;
33 import java.util.BitSet ;
34 import java.util.EventListener ;
35
36 import nextapp.echo2.app.event.EventListenerList;
37 import nextapp.echo2.app.event.ChangeEvent;
38 import nextapp.echo2.app.event.ChangeListener;
39
40
43 public class DefaultListSelectionModel
44 implements ListSelectionModel, Serializable {
45
46 private EventListenerList listenerList = new EventListenerList();
47 private int selectionMode = SINGLE_SELECTION;
48 private BitSet selection = new BitSet ();
49 private int minSelectedIndex = -1;
50
51
55 public void addChangeListener(ChangeListener l) {
56 listenerList.addListener(ChangeListener.class, l);
57 }
58
59
62 public void clearSelection() {
63 selection = new BitSet ();
64 minSelectedIndex = -1;
65 fireValueChanged();
66 }
67
68
72 protected void fireValueChanged() {
73 ChangeEvent e = new ChangeEvent(this);
74 EventListener [] listeners = listenerList.getListeners(ChangeListener.class);
75 for (int index = 0; index < listeners.length; ++index) {
76 ((ChangeListener) listeners[index]).stateChanged(e);
77 }
78 }
79
80
83 public int getMaxSelectedIndex() {
84 return selection.length() - 1;
85 }
86
87
90 public int getMinSelectedIndex() {
91 return minSelectedIndex;
92 }
93
94
97 public int getSelectionMode() {
98 return selectionMode;
99 }
100
101
104 public boolean isSelectedIndex(int index) {
105 return selection.get(index);
106 }
107
108
111 public boolean isSelectionEmpty() {
112 return selection.length() == 0;
113 }
114
115
118 public void removeChangeListener(ChangeListener l) {
119 listenerList.removeListener(ChangeListener.class, l);
120 }
121
122
125 public void setSelectedIndex(int index, boolean newValue) {
126 boolean oldValue = isSelectedIndex(index);
127
128 if (newValue ^ oldValue) {
129 if (newValue) {
130 if (selectionMode == SINGLE_SELECTION && getMinSelectedIndex() != -1) {
131 setSelectedIndex(getMinSelectedIndex(), false);
132 }
133 selection.set(index);
134 if (index < minSelectedIndex || minSelectedIndex == -1) {
135 minSelectedIndex = index;
136 }
137 } else {
138 selection.clear(index);
139 if (index == minSelectedIndex) {
140 int max = getMaxSelectedIndex();
142 minSelectedIndex = -1;
143 for (int i = 0; i <= max; ++i) {
144 if (selection.get(i)) {
145 minSelectedIndex = i;
146 break;
147 }
148 }
149 }
150 }
151 fireValueChanged();
152 }
153 }
154
155
158 public void setSelectionMode(int selectionMode) {
159 if (selectionMode != MULTIPLE_SELECTION && this.selectionMode == MULTIPLE_SELECTION) {
160 int maxSelectedIndex = getMaxSelectedIndex();
162 for (int i = minSelectedIndex + 1; i <= maxSelectedIndex; ++i) {
163 setSelectedIndex(i, false);
164 }
165 }
166 this.selectionMode = selectionMode;
167 fireValueChanged();
168 }
169 }
170 |
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