API Overview API Index Package Overview Direct link to this page
JDK 1.6
  java.awt. Scrollbar View Javadoc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315

/*
 * @(#)Scrollbar.java	1.112 06/07/11
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package java.awt;

import java.awt.peer.ScrollbarPeer;
import java.awt.event.*;
import java.util.EventListener;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import javax.accessibility.*;


/**
 * The <code>Scrollbar</code> class embodies a scroll bar, a
 * familiar user-interface object. A scroll bar provides a
 * convenient means for allowing a user to select from a
 * range of values. The following three vertical
 * scroll bars could be used as slider controls to pick
 * the red, green, and blue components of a color:
 * <p>
 * <img src="doc-files/Scrollbar-1.gif" alt="Image shows 3 vertical sliders, side-by-side."
 * ALIGN=center HSPACE=10 VSPACE=7>
 * <p>
 * Each scroll bar in this example could be created with
 * code similar to the following:
 * <p>
 * <hr><blockquote><pre>
 * redSlider=new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 255);
 * add(redSlider);
 * </pre></blockquote><hr>
 * <p>
 * Alternatively, a scroll bar can represent a range of values. For
 * example, if a scroll bar is used for scrolling through text, the
 * width of the "bubble" (also called the "thumb" or "scroll box")
 * can be used to represent the amount of text that is visible.
 * Here is an example of a scroll bar that represents a range:
 * <p>
 * <img src="doc-files/Scrollbar-2.gif"
 * alt="Image shows horizontal slider with starting range of 0 and ending range of 300. The slider thumb is labeled 60."
 * ALIGN=center HSPACE=10 VSPACE=7>
 * <p>
 * The value range represented by the bubble in this example
 * is the <em>visible amount</em>. The horizontal scroll bar 
 * in this example could be created with code like the following:
 * <p>
 * <hr><blockquote><pre>
 * ranger = new Scrollbar(Scrollbar.HORIZONTAL, 0, 60, 0, 300);
 * add(ranger);
 * </pre></blockquote><hr>
 * <p>
 * Note that the actual maximum value of the scroll bar is the
 * <code>maximum</code> minus the <code>visible amount</code>.
 * In the previous example, because the <code>maximum</code> is
 * 300 and the <code>visible amount</code> is 60, the actual maximum
 * value is 240.  The range of the scrollbar track is 0 - 300.
 * The left side of the bubble indicates the value of the
 * scroll bar.
 * <p>
 * Normally, the user changes the value of the scroll bar by
 * making a gesture with the mouse. For example, the user can
 * drag the scroll bar's bubble up and down, or click in the
 * scroll bar's unit increment or block increment areas. Keyboard
 * gestures can also be mapped to the scroll bar. By convention,
 * the <b>Page&nbsp;Up</b> and <b>Page&nbsp;Down</b>
 * keys are equivalent to clicking in the scroll bar's block
 * increment and block decrement areas.
 * <p>
 * When the user changes the value of the scroll bar, the scroll bar
 * receives an instance of <code>AdjustmentEvent</code>.
 * The scroll bar processes this event, passing it along to
 * any registered listeners.
 * <p>
 * Any object that wishes to be notified of changes to the
 * scroll bar's value should implement
 * <code>AdjustmentListener</code>, an interface defined in
 * the package <code>java.awt.event</code>.
 * Listeners can be added and removed dynamically by calling
 * the methods <code>addAdjustmentListener</code> and
 * <code>removeAdjustmentListener</code>.
 * <p>
 * The <code>AdjustmentEvent</code> class defines five types
 * of adjustment event, listed here:
 * <p>
 * <ul>
 * <li><code>AdjustmentEvent.TRACK</code> is sent out when the
 * user drags the scroll bar's bubble.
 * <li><code>AdjustmentEvent.UNIT_INCREMENT</code> is sent out
 * when the user clicks in the left arrow of a horizontal scroll
 * bar, or the top arrow of a vertical scroll bar, or makes the
 * equivalent gesture from the keyboard.
 * <li><code>AdjustmentEvent.UNIT_DECREMENT</code> is sent out
 * when the user clicks in the right arrow of a horizontal scroll
 * bar, or the bottom arrow of a vertical scroll bar, or makes the
 * equivalent gesture from the keyboard.
 * <li><code>AdjustmentEvent.BLOCK_INCREMENT</code> is sent out
 * when the user clicks in the track, to the left of the bubble
 * on a horizontal scroll bar, or above the bubble on a vertical
 * scroll bar. By convention, the <b>Page&nbsp;Up</b>
 * key is equivalent, if the user is using a keyboard that
 * defines a <b>Page&nbsp;Up</b> key.
 * <li><code>AdjustmentEvent.BLOCK_DECREMENT</code> is sent out
 * when the user clicks in the track, to the right of the bubble
 * on a horizontal scroll bar, or below the bubble on a vertical
 * scroll bar. By convention, the <b>Page&nbsp;Down</b>
 * key is equivalent, if the user is using a keyboard that
 * defines a <b>Page&nbsp;Down</b> key.
 * </ul>
 * <p>
 * The JDK&nbsp;1.0 event system is supported for backwards
 * compatibility, but its use with newer versions of the platform is
 * discouraged. The five types of adjustment events introduced
 * with JDK&nbsp;1.1 correspond to the five event types
 * that are associated with scroll bars in previous platform versions.
 * The following list gives the adjustment event type,
 * and the corresponding JDK&nbsp;1.0 event type it replaces.
 * <p>
 * <ul>
 * <li><code>AdjustmentEvent.TRACK</code> replaces
 * <code>Event.SCROLL_ABSOLUTE</code>
 * <li><code>AdjustmentEvent.UNIT_INCREMENT</code> replaces
 * <code>Event.SCROLL_LINE_UP</code>
 * <li><code>AdjustmentEvent.UNIT_DECREMENT</code> replaces
 * <code>Event.SCROLL_LINE_DOWN</code>
 * <li><code>AdjustmentEvent.BLOCK_INCREMENT</code> replaces
 * <code>Event.SCROLL_PAGE_UP</code>
 * <li><code>AdjustmentEvent.BLOCK_DECREMENT</code> replaces
 * <code>Event.SCROLL_PAGE_DOWN</code>
 * </ul>
 * <p>
 * <b>Note</b>: We recommend using a <code>Scrollbar</code>
 * for value selection only.  If you want to implement
 * a scrollable component inside a container, we recommend you use
 * a {@link ScrollPane ScrollPane}. If you use a 
 * <code>Scrollbar</code> for this purpose, you are likely to
 * encounter issues with painting, key handling, sizing and 
 * positioning.
 *
 * @version 	1.112, 07/11/06
 * @author 	Sami Shaio
 * @see         java.awt.event.AdjustmentEvent
 * @see         java.awt.event.AdjustmentListener
 * @since       JDK1.0
 */
public class Scrollbar extends Component implements Adjustable, Accessible {

    /**
     * A constant that indicates a horizontal scroll bar.
     */
    public static final int	HORIZONTAL = 0;

    /**
     * A constant that indicates a vertical scroll bar.
     */
    public static final int	VERTICAL   = 1;

    /**
     * The value of the <code>Scrollbar</code>.
     * This property must be greater than or equal to <code>minimum</code>
     * and less than or equal to 
     * <code>maximum - visibleAmount</code>
     *
     * @serial
     * @see #getValue
     * @see #setValue
     */
    int	value;

    /**
     * The maximum value of the <code>Scrollbar</code>.
     * This value must be greater than the <code>minimum</code>
     * value.<br>
     *
     * @serial
     * @see #getMaximum
     * @see #setMaximum
     */
    int	maximum;

    /**
     * The minimum value of the <code>Scrollbar</code>.
     * This value must be less than the <code>maximum</code>
     * value.<br>
     *
     * @serial
     * @see #getMinimum
     * @see #setMinimum
     */
    int	minimum;

    /**
     * The size of the <code>Scrollbar</code>'s bubble.  
     * When a scroll bar is used to select a range of values,
     * the visibleAmount represents the size of this range.
     * This is visually indicated by the size of the bubble. 
     *
     * @serial
     * @see #getVisibleAmount
     * @see #setVisibleAmount
     */
    int	visibleAmount;

    /**
     * The <code>Scrollbar</code>'s orientation--being either horizontal
     * or vertical.
     * This value should be specified when the scrollbar is created.<BR>
     * orientation can be either : <code>VERTICAL</code> or
     * <code>HORIZONTAL</code> only.
     *
     * @serial
     * @see #getOrientation
     * @see #setOrientation
     */
    int	orientation;

    /**
     * The amount by which the scrollbar value will change when going
     * up or down by a line.
     * This value must be greater than zero.  
     *
     * @serial
     * @see #getLineIncrement
     * @see #setLineIncrement
     */
    int lineIncrement = 1;

    /**
     * The amount by which the scrollbar value will change when going
     * up or down by a page.
     * This value must be greater than zero. 
     *
     * @serial
     * @see #getPageIncrement
     * @see #setPageIncrement
     */
    int pageIncrement = 10;

    /**
     * The adjusting status of the <code>Scrollbar</code>.
     * True if the value is in the process of changing as a result of
     * actions being taken by the user.
     *
     * @see #getValueIsAdjusting
     * @see #setValueIsAdjusting
     * @since 1.4
     */
    transient boolean isAdjusting;

    transient AdjustmentListener adjustmentListener;

    private static final String base = "scrollbar";
    private static int nameCounter = 0;

    /*
     * JDK 1.1 serialVersionUID
     */
    private static final long serialVersionUID = 8451667562882310543L;

    /**
     * Initialize JNI field and method IDs.
     */
    private static native void initIDs();

    static {
        /* ensure that the necessary native libraries are loaded */
        Toolkit.loadLibraries();
        if (!GraphicsEnvironment.isHeadless()) {
            initIDs();
        }
    }

    /**
     * Constructs a new vertical scroll bar.
     * The default properties of the scroll bar are listed in
     * the following table:
     * <p> </p>
     * <table border=1 summary="Scrollbar default properties">
     * <tr>
     *   <th>Property</th>
     *   <th>Description</th>
     *   <th>Default Value</th>
     * </tr>
     * <tr>
     *   <td>orientation</td>
     *   <td>indicates whether the scroll bar is vertical
     *   <br>or horizontal</td>
     *   <td><code>Scrollbar.VERTICAL</code></td>
     * </tr>
     * <tr>
     *   <td>value</td>
     *   <td>value which controls the location
     *   <br>of the scroll bar's bubble</td>
     *   <td>0</td>
     * </tr>
     * <tr>
     *   <td>visible amount</td>
     *   <td>visible amount of the scroll bar's range,
     *   <br>typically represented by the size of the 
     *   <br>scroll bar's bubble</td>
     *   <td>10</td>
     * </tr>
     * <tr>
     *   <td>minimum</td>
     *   <td>minimum value of the scroll bar</td>
     *   <td>0</td>
     * </tr>
     * <tr>
     *   <td>maximum</td>
     *   <td>maximum value of the scroll bar</td>
     *   <td>100</td>
     * </tr>
     * <tr>
     *   <td>unit increment</td>
     *   <td>amount the value changes when the
     *   <br>Line Up or Line Down key is pressed,
     *   <br>or when the end arrows of the scrollbar
     *   <br>are clicked </td>
     *   <td>1</td>
     * </tr>
     * <tr>
     *   <td>block increment</td>
     *   <td>amount the value changes when the
     *   <br>Page Up or Page Down key is pressed,
     *   <br>or when the scrollbar track is clicked 
     *   <br>on either side of the bubble </td>
     *   <td>10</td>
     * </tr>
     * </table>
     *
     * @exception HeadlessException if GraphicsEnvironment.isHeadless()
     * returns true.
     * @see java.awt.GraphicsEnvironment#isHeadless
     */
    public Scrollbar() throws HeadlessException {
	this(VERTICAL, 0, 10, 0, 100);
    }

    /**
     * Constructs a new scroll bar with the specified orientation.
     * <p>
     * The <code>orientation</code> argument must take one of the two
     * values <code>Scrollbar.HORIZONTAL</code>,
     * or <code>Scrollbar.VERTICAL</code>,
     * indicating a horizontal or vertical scroll bar, respectively.
     * 
     * @param       orientation   indicates the orientation of the scroll bar
     * @exception   IllegalArgumentException    when an illegal value for
     *                    the <code>orientation</code> argument is supplied
     * @exception HeadlessException if GraphicsEnvironment.isHeadless()
     * returns true.
     * @see java.awt.GraphicsEnvironment#isHeadless
     */
    public Scrollbar(int orientation) throws HeadlessException {
        this(orientation, 0, 10, 0, 100);
    }

    /**
     * Constructs a new scroll bar with the specified orientation,
     * initial value, visible amount, and minimum and maximum values.
     * <p>
     * The <code>orientation</code> argument must take one of the two
     * values <code>Scrollbar.HORIZONTAL</code>,
     * or <code>Scrollbar.VERTICAL</code>,
     * indicating a horizontal or vertical scroll bar, respectively.
     * <p>
     * The parameters supplied to this constructor are subject to the 
     * constraints described in {@link #setValues(int, int, int, int)}. 
     * 
     * @param     orientation   indicates the orientation of the scroll bar.
     * @param     value     the initial value of the scroll bar
     * @param     visible   the visible amount of the scroll bar, typically 
     *                      represented by the size of the bubble 
     * @param     minimum   the minimum value of the scroll bar
     * @param     maximum   the maximum value of the scroll bar
     * @exception IllegalArgumentException    when an illegal value for
     *                    the <code>orientation</code> argument is supplied
     * @exception HeadlessException if GraphicsEnvironment.isHeadless()
     * returns true.
     * @see #setValues
     * @see java.awt.GraphicsEnvironment#isHeadless
     */
    public Scrollbar(int orientation, int value, int visible, int minimum,
        int maximum) throws HeadlessException {
        GraphicsEnvironment.checkHeadless();
	switch (orientation) {
	  case HORIZONTAL:
	  case VERTICAL:
	    this.orientation = orientation;
	    break;
	  default:
	    throw new IllegalArgumentException("illegal scrollbar orientation");
	}
	setValues(value, visible, minimum, maximum);
    }

    /**
     * Constructs a name for this component.  Called by <code>getName</code>
     * when the name is <code>null</code>.
     */
    String constructComponentName() {
        synchronized (getClass()) {
	    return base + nameCounter++;
	}
    }

    /**
     * Creates the <code>Scrollbar</code>'s peer.  The peer allows you to modify
     * the appearance of the <code>Scrollbar</code> without changing any of its
     * functionality.
     */
    public void addNotify() {
        synchronized (getTreeLock()) {
	    if (peer == null) 
	        peer = getToolkit().createScrollbar(this);
	    super.addNotify();
	}
    }

    /**
     * Returns the orientation of this scroll bar.
     * 
     * @return    the orientation of this scroll bar, either
     *               <code>Scrollbar.HORIZONTAL</code> or
     *               <code>Scrollbar.VERTICAL</code>
     * @see       java.awt.Scrollbar#setOrientation
     */
    public int getOrientation() {
	return orientation;
    }

    /**
     * Sets the orientation for this scroll bar.
     * 
     * @param orientation  the orientation of this scroll bar, either
     *               <code>Scrollbar.HORIZONTAL</code> or
     *               <code>Scrollbar.VERTICAL</code>
     * @see       java.awt.Scrollbar#getOrientation
     * @exception   IllegalArgumentException  if the value supplied
     *                   for <code>orientation</code> is not a
     *                   legal value
     * @since     JDK1.1
     */
    public void setOrientation(int orientation) {
        synchronized (getTreeLock()) {
	    if (orientation == this.orientation) {
	        return;
	    }
	    switch (orientation) {
	        case HORIZONTAL:
	        case VERTICAL:
		    this.orientation = orientation;
		    break;
	        default:
		    throw new IllegalArgumentException("illegal scrollbar orientation");
	    }
	    /* Create a new peer with the specified orientation. */
	    if (peer != null) {
		removeNotify();
		addNotify();
		invalidate();
	    }
	}
        if (accessibleContext != null) {
            accessibleContext.firePropertyChange(
                    AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                    ((orientation == VERTICAL)
                     ? AccessibleState.HORIZONTAL : AccessibleState.VERTICAL),
                    ((orientation == VERTICAL) 
                     ? AccessibleState.VERTICAL : AccessibleState.HORIZONTAL));
        }
    }

    /**
     * Gets the current value of this scroll bar.
     * 
     * @return      the current value of this scroll bar
     * @see         java.awt.Scrollbar#getMinimum
     * @see         java.awt.Scrollbar#getMaximum
     */
    public int getValue() {
	return value;
    }

    /**
     * Sets the value of this scroll bar to the specified value.
     * <p>
     * If the value supplied is less than the current <code>minimum</code> 
     * or greater than the current <code>maximum - visibleAmount</code>, 
     * then either <code>minimum</code> or <code>maximum - visibleAmount</code> 
     * is substituted, as appropriate.
     * <p>
     * Normally, a program should change a scroll bar's
     * value only by calling <code>setValues</code>.
     * The <code>setValues</code> method simultaneously
     * and synchronously sets the minimum, maximum, visible amount,
     * and value properties of a scroll bar, so that they are
     * mutually consistent.
     * <p>
     * Calling this method does not fire an
     * <code>AdjustmentEvent</code>.
     * 
     * @param       newValue   the new value of the scroll bar
     * @see         java.awt.Scrollbar#setValues
     * @see         java.awt.Scrollbar#getValue
     * @see         java.awt.Scrollbar#getMinimum
     * @see         java.awt.Scrollbar#getMaximum
     */
    public void setValue(int newValue) {
        // Use setValues so that a consistent policy relating
        // minimum, maximum, visible amount, and value is enforced.
        setValues(newValue, visibleAmount, minimum, maximum);
    }

    /**
     * Gets the minimum value of this scroll bar.
     * 
     * @return      the minimum value of this scroll bar
     * @see         java.awt.Scrollbar#getValue
     * @see         java.awt.Scrollbar#getMaximum
     */
    public int getMinimum() {
	return minimum;
    }

    /**
     * Sets the minimum value of this scroll bar.
     * <p>
     * When <code>setMinimum</code> is called, the minimum value 
     * is changed, and other values (including the maximum, the 
     * visible amount, and the current scroll bar value) 
     * are changed to be consistent with the new minimum.  
     * <p>
     * Normally, a program should change a scroll bar's minimum
     * value only by calling <code>setValues</code>.
     * The <code>setValues</code> method simultaneously
     * and synchronously sets the minimum, maximum, visible amount,
     * and value properties of a scroll bar, so that they are
     * mutually consistent.
     * <p>
     * Note that setting the minimum value to <code>Integer.MAX_VALUE</code>
     * will result in the new minimum value being set to 
     * <code>Integer.MAX_VALUE - 1</code>.
     *
     * @param       newMinimum   the new minimum value for this scroll bar
     * @see         java.awt.Scrollbar#setValues
     * @see         java.awt.Scrollbar#setMaximum
     * @since       JDK1.1
     */
    public void setMinimum(int newMinimum) {
        // No checks are necessary in this method since minimum is 
        // the first variable checked in the setValues function.  

        // Use setValues so that a consistent policy relating 
        // minimum, maximum, visible amount, and value is enforced.
        setValues(value, visibleAmount, newMinimum, maximum);
    }

    /**
     * Gets the maximum value of this scroll bar.
     * 
     * @return      the maximum value of this scroll bar
     * @see         java.awt.Scrollbar#getValue
     * @see         java.awt.Scrollbar#getMinimum
     */
    public int getMaximum() {
	return maximum;
    }

    /**
     * Sets the maximum value of this scroll bar.
     * <p>
     * When <code>setMaximum</code> is called, the maximum value 
     * is changed, and other values (including the minimum, the 
     * visible amount, and the current scroll bar value)
     * are changed to be consistent with the new maximum.
     * <p>
     * Normally, a program should change a scroll bar's maximum
     * value only by calling <code>setValues</code>.
     * The <code>setValues</code> method simultaneously
     * and synchronously sets the minimum, maximum, visible amount,
     * and value properties of a scroll bar, so that they are
     * mutually consistent.
     * <p>
     * Note that setting the maximum value to <code>Integer.MIN_VALUE</code>
     * will result in the new maximum value being set to 
     * <code>Integer.MIN_VALUE + 1</code>.
     * 
     * @param       newMaximum   the new maximum value
     *                     for this scroll bar
     * @see         java.awt.Scrollbar#setValues
     * @see         java.awt.Scrollbar#setMinimum
     * @since       JDK1.1
     */
    public void setMaximum(int newMaximum) {
        // minimum is checked first in setValues, so we need to 
        // enforce minimum and maximum checks here.  
        if (newMaximum == Integer.MIN_VALUE) {
            newMaximum = Integer.MIN_VALUE + 1;
        }

        if (minimum >= newMaximum) {
            minimum = newMaximum - 1;
        }

        // Use setValues so that a consistent policy relating 
        // minimum, maximum, visible amount, and value is enforced.
        setValues(value, visibleAmount, minimum, newMaximum);
    }

    /**
     * Gets the visible amount of this scroll bar.
     * <p>
     * When a scroll bar is used to select a range of values,
     * the visible amount is used to represent the range of values
     * that are currently visible.  The size of the scroll bar's
     * bubble (also called a thumb or scroll box), usually gives a
     * visual representation of the relationship of the visible
     * amount to the range of the scroll bar.
     * <p>
     * The scroll bar's bubble may not be displayed when it is not 
     * moveable (e.g. when it takes up the entire length of the 
     * scroll bar's track, or when the scroll bar is disabled). 
     * Whether the bubble is displayed or not will not affect 
     * the value returned by <code>getVisibleAmount</code>. 
     * 
     * @return      the visible amount of this scroll bar
     * @see         java.awt.Scrollbar#setVisibleAmount
     * @since       JDK1.1
     */
    public int getVisibleAmount() {
	return getVisible();
    }

    /**
     * @deprecated As of JDK version 1.1,
     * replaced by <code>getVisibleAmount()</code>.
     */
@Deprecated
    public int getVisible() {
	return visibleAmount;
    }

    /**
     * Sets the visible amount of this scroll bar.
     * <p>
     * When a scroll bar is used to select a range of values,
     * the visible amount is used to represent the range of values
     * that are currently visible.  The size of the scroll bar's
     * bubble (also called a thumb or scroll box), usually gives a
     * visual representation of the relationship of the visible
     * amount to the range of the scroll bar.
     * <p>
     * The scroll bar's bubble may not be displayed when it is not 
     * moveable (e.g. when it takes up the entire length of the 
     * scroll bar's track, or when the scroll bar is disabled). 
     * Whether the bubble is displayed or not will not affect 
     * the value returned by <code>getVisibleAmount</code>. 
     * <p>
     * If the visible amount supplied is less than <code>one</code>
     * or greater than the current <code>maximum - minimum</code>, 
     * then either <code>one</code> or <code>maximum - minimum</code> 
     * is substituted, as appropriate.
     * <p>
     * Normally, a program should change a scroll bar's
     * value only by calling <code>setValues</code>.
     * The <code>setValues</code> method simultaneously
     * and synchronously sets the minimum, maximum, visible amount,
     * and value properties of a scroll bar, so that they are
     * mutually consistent.
     * 
     * @param       newAmount the new visible amount
     * @see         java.awt.Scrollbar#getVisibleAmount
     * @see         java.awt.Scrollbar#setValues
     * @since       JDK1.1
     */
    public void setVisibleAmount(int newAmount) {
        // Use setValues so that a consistent policy relating
        // minimum, maximum, visible amount, and value is enforced.
        setValues(value, newAmount, minimum, maximum);
    }

    /**
     * Sets the unit increment for this scroll bar.
     * <p>
     * The unit increment is the value that is added or subtracted
     * when the user activates the unit increment area of the
     * scroll bar, generally through a mouse or keyboard gesture
     * that the scroll bar receives as an adjustment event.
     * The unit increment must be greater than zero. 
     * Attepts to set the unit increment to a value lower than 1 
     * will result in a value of 1 being set.  
     * 
     * @param        v  the amount by which to increment or decrement
     *                         the scroll bar's value
     * @see          java.awt.Scrollbar#getUnitIncrement
     * @since        JDK1.1
     */
    public void setUnitIncrement(int v) {
	setLineIncrement(v);
    }

    /**
     * @deprecated As of JDK version 1.1,
     * replaced by <code>setUnitIncrement(int)</code>.
     */
@Deprecated
    public synchronized void setLineIncrement(int v) {
        int tmp = (v < 1) ? 1 : v; 

        if (lineIncrement == tmp) {
            return; 
        }
        lineIncrement = tmp; 

        ScrollbarPeer peer = (ScrollbarPeer)this.peer;
        if (peer != null) {
            peer.setLineIncrement(lineIncrement);
        }
    }

    /**
     * Gets the unit increment for this scrollbar.
     * <p>
     * The unit increment is the value that is added or subtracted
     * when the user activates the unit increment area of the
     * scroll bar, generally through a mouse or keyboard gesture
     * that the scroll bar receives as an adjustment event.
     * The unit increment must be greater than zero. 
     * 
     * @return      the unit increment of this scroll bar
     * @see         java.awt.Scrollbar#setUnitIncrement
     * @since       JDK1.1
     */
    public int getUnitIncrement() {
	return getLineIncrement();
    }

    /**
     * @deprecated As of JDK version 1.1,
     * replaced by <code>getUnitIncrement()</code>.
     */
@Deprecated
    public int getLineIncrement() {
	return lineIncrement;
    }

    /**
     * Sets the block increment for this scroll bar.
     * <p>
     * The block increment is the value that is added or subtracted
     * when the user activates the block increment area of the
     * scroll bar, generally through a mouse or keyboard gesture
     * that the scroll bar receives as an adjustment event.
     * The block increment must be greater than zero. 
     * Attepts to set the block increment to a value lower than 1 
     * will result in a value of 1 being set.  
     * 
     * @param        v  the amount by which to increment or decrement
     *                         the scroll bar's value
     * @see          java.awt.Scrollbar#getBlockIncrement
     * @since        JDK1.1
     */
    public void setBlockIncrement(int v) {
	setPageIncrement(v);
    }

    /**
     * @deprecated As of JDK version 1.1,
     * replaced by <code>setBlockIncrement()</code>.
     */
@Deprecated
    public synchronized void setPageIncrement(int v) {
        int tmp = (v < 1) ? 1 : v; 

        if (pageIncrement == tmp) {
            return; 
        }
        pageIncrement = tmp; 

        ScrollbarPeer peer = (ScrollbarPeer)this.peer;
        if (peer != null) {
            peer.setPageIncrement(pageIncrement);
        }
    }

    /**
     * Gets the block increment of this scroll bar.
     * <p>
     * The block increment is the value that is added or subtracted
     * when the user activates the block increment area of the
     * scroll bar, generally through a mouse or keyboard gesture
     * that the scroll bar receives as an adjustment event.
     * The block increment must be greater than zero. 
     * 
     * @return      the block increment of this scroll bar
     * @see         java.awt.Scrollbar#setBlockIncrement
     * @since       JDK1.1
     */
    public int getBlockIncrement() {
	return getPageIncrement();
    }

    /**
     * @deprecated As of JDK version 1.1,
     * replaced by <code>getBlockIncrement()</code>.
     */
@Deprecated
    public int getPageIncrement() {
	return pageIncrement;
    }

    /**
     * Sets the values of four properties for this scroll bar: 
     * <code>value</code>, <code>visibleAmount</code>, 
     * <code>minimum</code>, and <code>maximum</code>.
     * If the values supplied for these properties are inconsistent 
     * or incorrect, they will be changed to ensure consistency.  
     * <p>
     * This method simultaneously and synchronously sets the values
     * of four scroll bar properties, assuring that the values of
     * these properties are mutually consistent. It enforces the
     * following constraints:  
     * <code>maximum</code> must be greater than <code>minimum</code>,  
     * <code>maximum - minimum</code> must not be greater 
     *     than <code>Integer.MAX_VALUE</code>,  
     * <code>visibleAmount</code> must be greater than zero. 
     * <code>visibleAmount</code> must not be greater than 
     *     <code>maximum - minimum</code>,  
     * <code>value</code> must not be less than <code>minimum</code>,  
     * and <code>value</code> must not be greater than 
     *     <code>maximum - visibleAmount</code> 
     * <p>
     * Calling this method does not fire an
     * <code>AdjustmentEvent</code>.
     *
     * @param      value is the position in the current window
     * @param      visible is the visible amount of the scroll bar
     * @param      minimum is the minimum value of the scroll bar
     * @param      maximum is the maximum value of the scroll bar
     * @see        #setMinimum
     * @see        #setMaximum
     * @see        #setVisibleAmount
     * @see        #setValue
     */
    public void setValues(int value, int visible, int minimum, int maximum) {
        int oldValue;
        synchronized (this) {
            if (minimum == Integer.MAX_VALUE) {
                minimum = Integer.MAX_VALUE - 1;
            }
            if (maximum <= minimum) {
                maximum = minimum + 1;
            }

            long maxMinusMin = (long) maximum - (long) minimum;
            if (maxMinusMin > Integer.MAX_VALUE) {
                maxMinusMin = Integer.MAX_VALUE;
                maximum = minimum + (int) maxMinusMin;
            }
            if (visible > (int) maxMinusMin) {
                visible = (int) maxMinusMin;
            }
            if (visible < 1) {
                visible = 1;
            }

            if (value < minimum) {
                value = minimum;
            }
            if (value > maximum - visible) {
                value = maximum - visible;
            }

            oldValue = this.value;
            this.value = value;
            this.visibleAmount = visible;
            this.minimum = minimum;
            this.maximum = maximum;
            ScrollbarPeer peer = (ScrollbarPeer)this.peer;
            if (peer != null) {
                peer.setValues(value, visibleAmount, minimum, maximum);
            }
        }

        if ((oldValue != value) && (accessibleContext != null))  {
            accessibleContext.firePropertyChange(
                    AccessibleContext.ACCESSIBLE_VALUE_PROPERTY,
                    Integer.valueOf(oldValue),
                    Integer.valueOf(value));
        }
    }

    /**
     * Returns true if the value is in the process of changing as a
     * result of actions being taken by the user.
     *
     * @return the value of the <code>valueIsAdjusting</code> property
     * @see #setValueIsAdjusting
     * @since 1.4
     */
    public boolean getValueIsAdjusting() { 
        return isAdjusting; 
    }

    /**
     * Sets the <code>valueIsAdjusting</code> property.
     * 
     * @param b new adjustment-in-progress status
     * @see #getValueIsAdjusting
     * @since 1.4
     */
    public void setValueIsAdjusting(boolean b) {
	boolean oldValue;

	synchronized (this) {
	    oldValue = isAdjusting;
	    isAdjusting = b;
	}

	if ((oldValue != b) && (accessibleContext != null)) {
            accessibleContext.firePropertyChange(
                    AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                    ((oldValue) ? AccessibleState.BUSY : null),
                    ((b) ? AccessibleState.BUSY : null));
	}
    }



    /**
     * Adds the specified adjustment listener to receive instances of
     * <code>AdjustmentEvent</code> from this scroll bar.
     * If l is <code>null</code>, no exception is thrown and no
     * action is performed.
     * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
     * >AWT Threading Issues</a> for details on AWT's threading model.
     *
     * @param        l the adjustment listener
     * @see          #removeAdjustmentListener
     * @see          #getAdjustmentListeners
     * @see          java.awt.event.AdjustmentEvent
     * @see          java.awt.event.AdjustmentListener
     * @since        JDK1.1
     */
    public synchronized void addAdjustmentListener(AdjustmentListener l) {
	if (l == null) {
	    return;
	}
	adjustmentListener = AWTEventMulticaster.add(adjustmentListener, l);
        newEventsOnly = true;
    }

    /**
     * Removes the specified adjustment listener so that it no longer
     * receives instances of <code>AdjustmentEvent</code> from this scroll bar.
     * If l is <code>null</code>, no exception is thrown and no action
     * is performed.
     * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
     * >AWT Threading Issues</a> for details on AWT's threading model.
     *
     * @param        	l    the adjustment listener
     * @see          	#addAdjustmentListener
     * @see          	#getAdjustmentListeners
     * @see          	java.awt.event.AdjustmentEvent
     * @see          	java.awt.event.AdjustmentListener
     * @since        	JDK1.1
     */
    public synchronized void removeAdjustmentListener(AdjustmentListener l) {
	if (l == null) {
	    return;
	}
	adjustmentListener = AWTEventMulticaster.remove(adjustmentListener, l);
    }

    /**
     * Returns an array of all the adjustment listeners
     * registered on this scrollbar.
     *
     * @return all of this scrollbar's <code>AdjustmentListener</code>s
     *         or an empty array if no adjustment 
     *         listeners are currently registered
     * @see          	#addAdjustmentListener
     * @see          	#removeAdjustmentListener
     * @see          	java.awt.event.AdjustmentEvent
     * @see          	java.awt.event.AdjustmentListener
     * @since 1.4
     */
    public synchronized AdjustmentListener[] getAdjustmentListeners() {
        return (AdjustmentListener[])(getListeners(AdjustmentListener.class));
    }

    /**
     * Returns an array of all the objects currently registered
     * as <code><em>Foo</em>Listener</code>s
     * upon this <code>Scrollbar</code>.
     * <code><em>Foo</em>Listener</code>s are registered using the
     * <code>add<em>Foo</em>Listener</code> method.
     * <p>
     * You can specify the <code>listenerType</code> argument
     * with a class literal,  such as
     * <code><em>Foo</em>Listener.class</code>.
     * For example, you can query a
     * <code>Scrollbar</code> <code>c</code>
     * for its mouse listeners with the following code:
     *
     * <pre>MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));</pre>
     *
     * If no such listeners exist, this method returns an empty array.
     *
     * @param listenerType the type of listeners requested; this parameter
     *          should specify an interface that descends from
     *          <code>java.util.EventListener</code>
     * @return an array of all objects registered as
     *          <code><em>Foo</em>Listener</code>s on this component,
     *          or an empty array if no such listeners have been added
     * @exception ClassCastException if <code>listenerType</code>
     *          doesn't specify a class or interface that implements
     *          <code>java.util.EventListener</code>
     *
     * @since 1.3
     */
    public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
	EventListener l = null; 
	if  (listenerType == AdjustmentListener.class) { 
	    l = adjustmentListener;
	} else {
	    return super.getListeners(listenerType);
	}
	return AWTEventMulticaster.getListeners(l, listenerType);
    }

    // REMIND: remove when filtering is done at lower level
    boolean eventEnabled(AWTEvent e) {
        if (e.id == AdjustmentEvent.ADJUSTMENT_VALUE_CHANGED) {
            if ((eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 ||
                adjustmentListener != null) {
                return true;
            }
            return false;
        }
        return super.eventEnabled(e);
    }

    /**
     * Processes events on this scroll bar. If the event is an
     * instance of <code>AdjustmentEvent</code>, it invokes the
     * <code>processAdjustmentEvent</code> method.
     * Otherwise, it invokes its superclass's
     * <code>processEvent</code> method.
     * <p>Note that if the event parameter is <code>null</code>
     * the behavior is unspecified and may result in an
     * exception.
     *
     * @param        e the event
     * @see          java.awt.event.AdjustmentEvent
     * @see          java.awt.Scrollbar#processAdjustmentEvent
     * @since        JDK1.1
     */
    protected void processEvent(AWTEvent e) {
        if (e instanceof AdjustmentEvent) {
            processAdjustmentEvent((AdjustmentEvent)e);
            return;
        }
	super.processEvent(e);
    }

    /**
     * Processes adjustment events occurring on this
     * scrollbar by dispatching them to any registered
     * <code>AdjustmentListener</code> objects.
     * <p>
     * This method is not called unless adjustment events are
     * enabled for this component. Adjustment events are enabled
     * when one of the following occurs:
     * <p><ul>
     * <li>An <code>AdjustmentListener</code> object is registered
     * via <code>addAdjustmentListener</code>.
     * <li>Adjustment events are enabled via <code>enableEvents</code>.
     * </ul><p>
     * <p>Note that if the event parameter is <code>null</code>
     * the behavior is unspecified and may result in an
     * exception.
     *
     * @param       e the adjustment event
     * @see         java.awt.event.AdjustmentEvent
     * @see         java.awt.event.AdjustmentListener
     * @see         java.awt.Scrollbar#addAdjustmentListener
     * @see         java.awt.Component#enableEvents
     * @since       JDK1.1
     */
    protected void processAdjustmentEvent(AdjustmentEvent e) {
        AdjustmentListener listener = adjustmentListener;
        if (listener != null) {
            listener.adjustmentValueChanged(e);
        }
    }

    /**
     * Returns a string representing the state of this <code>Scrollbar</code>.
     * This method is intended to be used only for debugging purposes, and the 
     * content and format of the returned string may vary between 
     * implementations. The returned string may be empty but may not be 
     * <code>null</code>.
     *
     * @return      the parameter string of this scroll bar
     */
    protected String paramString() {
	return super.paramString() +
	    ",val=" + value +
	    ",vis=" + visibleAmount +
	    ",min=" + minimum +
	    ",max=" + maximum +
	    ((orientation == VERTICAL) ? ",vert" : ",horz") +
	    ",isAdjusting=" + isAdjusting;
    }


    /* Serialization support.
     */

    /**
     * The scroll bar's serialized Data Version.
     *
     * @serial
     */
    private int scrollbarSerializedDataVersion = 1;

    /**
     * Writes default serializable fields to stream.  Writes
     * a list of serializable <code>AdjustmentListeners</code>
     * as optional data. The non-serializable listeners are
     * detected and no attempt is made to serialize them.
     *
     * @param s the <code>ObjectOutputStream</code> to write
     * @serialData <code>null</code> terminated sequence of 0
     *   or more pairs; the pair consists of a <code>String</code> 
     *   and an <code>Object</code>; the <code>String</code> indicates
     *   the type of object and is one of the following:
     *   <code>adjustmentListenerK</code> indicating an
     *     <code>AdjustmentListener</code> object
     *
     * @see AWTEventMulticaster#save(ObjectOutputStream, String, EventListener)
     * @see java.awt.Component#adjustmentListenerK
     * @see #readObject(ObjectInputStream)
     */
    private void writeObject(ObjectOutputStream s)
      throws IOException
    {
      s.defaultWriteObject();

      AWTEventMulticaster.save(s, adjustmentListenerK, adjustmentListener);
      s.writeObject(null);
    }

    /**
     * Reads the <code>ObjectInputStream</code> and if
     * it isn't <code>null</code> adds a listener to
     * receive adjustment events fired by the
     * <code>Scrollbar</code>.
     * Unrecognized keys or values will be ignored.
     * 
     * @param s the <code>ObjectInputStream</code> to read
     * @exception HeadlessException if
     *   <code>GraphicsEnvironment.isHeadless</code> returns
     *   <code>true</code>
     * @see java.awt.GraphicsEnvironment#isHeadless
     * @see #writeObject(ObjectOutputStream)
     */
    private void readObject(ObjectInputStream s)
      throws ClassNotFoundException, IOException, HeadlessException
    {
      GraphicsEnvironment.checkHeadless();
      s.defaultReadObject();

      Object keyOrNull;
      while(null != (keyOrNull = s.readObject())) {
	String key = ((String)keyOrNull).intern();

	if (adjustmentListenerK == key)
	  addAdjustmentListener((AdjustmentListener)(s.readObject()));

	else // skip value for unrecognized key
	  s.readObject();
      }
    }


/////////////////
// Accessibility support
////////////////

    /**
     * Gets the <code>AccessibleContext</code> associated with this 
     * <code>Scrollbar</code>. For scrollbars, the
     * <code>AccessibleContext</code> takes the form of an 
     * <code>AccessibleAWTScrollBar</code>. A new
     * <code>AccessibleAWTScrollBar</code> instance is created if necessary.
     *
     * @return an <code>AccessibleAWTScrollBar</code> that serves as the 
     *         <code>AccessibleContext</code> of this <code>ScrollBar</code>
     * @since 1.3
     */
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleAWTScrollBar();
        }
        return accessibleContext;
    }

    /**
     * This class implements accessibility support for the
     * <code>Scrollbar</code> class.  It provides an implementation of
     * the Java Accessibility API appropriate to scrollbar
     * user-interface elements.
     * @since 1.3
     */
    protected class AccessibleAWTScrollBar extends AccessibleAWTComponent
        implements AccessibleValue
    {
        /*
         * JDK 1.3 serialVersionUID
         */
        private static final long serialVersionUID = -344337268523697807L;

        /**
         * Get the state set of this object.
         *
         * @return an instance of <code>AccessibleState</code>
         *     containing the current state of the object
         * @see AccessibleState
         */
        public AccessibleStateSet getAccessibleStateSet() {
            AccessibleStateSet states = super.getAccessibleStateSet();
	    if (getValueIsAdjusting()) {
                states.add(AccessibleState.BUSY);
	    }
            if (getOrientation() == VERTICAL) {
                states.add(AccessibleState.VERTICAL);
            } else {
                states.add(AccessibleState.HORIZONTAL);
            }
            return states;
        }

        /**
         * Get the role of this object.
         *
         * @return an instance of <code>AccessibleRole</code>
         *     describing the role of the object
         */
        public AccessibleRole getAccessibleRole() {
            return AccessibleRole.SCROLL_BAR;
        }

        /**
	 * Get the <code>AccessibleValue</code> associated with this
	 * object.  In the implementation of the Java Accessibility
	 * API for this class, return this object, which is
	 * responsible for implementing the
	 * <code>AccessibleValue</code> interface on behalf of itself.
	 * 
	 * @return this object
         */
        public AccessibleValue getAccessibleValue() {
            return this;
        }

        /**
         * Get the accessible value of this object.
         *
         * @return The current value of this object.
         */
        public Number getCurrentAccessibleValue() {
            return Integer.valueOf(getValue());
        }

        /**
         * Set the value of this object as a Number.
         *
         * @return True if the value was set.
         */
        public boolean setCurrentAccessibleValue(Number n) {
            if (n instanceof Integer) {
                setValue(n.intValue());
                return true;
            } else {
                return false;
            }
        }

        /**
         * Get the minimum accessible value of this object.
         *
         * @return The minimum value of this object.
         */
        public Number getMinimumAccessibleValue() {
            return Integer.valueOf(getMinimum());
        }

        /**
         * Get the maximum accessible value of this object.
         *
         * @return The maximum value of this object.
         */
        public Number getMaximumAccessibleValue() {
            return Integer.valueOf(getMaximum());
        }

    } // AccessibleAWTScrollBar

}

Generated By: JavaOnTracks Doclet 0.1.4     ©Thibaut Colar