summaryrefslogtreecommitdiffstats
path: root/src/gui/widgets/qsplitter.cpp
blob: 3803c8f967403a9d9e9b41f2d1532db953ac62e1 (plain)
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
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qsplitter.h"
#ifndef QT_NO_SPLITTER

#include "qapplication.h"
#include "qcursor.h"
#include "qdrawutil.h"
#include "qevent.h"
#include "qlayout.h"
#include "qlist.h"
#include "qpainter.h"
#include "qrubberband.h"
#include "qstyle.h"
#include "qstyleoption.h"
#include "qtextstream.h"
#include "qvarlengtharray.h"
#include "qvector.h"
#include "private/qlayoutengine_p.h"
#include "private/qsplitter_p.h"
#include "qtimer.h"
#include "qdebug.h"

#include <ctype.h>

QT_BEGIN_NAMESPACE

//#define QSPLITTER_DEBUG

/*!
    \class QSplitterHandle
    \brief The QSplitterHandle class provides handle functionality of the splitter.

    \ingroup organizers

    QSplitterHandle is typically what people think about when they think about
    a splitter. It is the handle that is used to resize the widgets.

    A typical developer using QSplitter will never have to worry about
    QSplitterHandle. It is provided for developers who want splitter handles
    that provide extra features, such as popup menus.

    The typical way one would create splitter handles is to subclass QSplitter then
    reimplement QSplitter::createHandle() to instantiate the custom splitter
    handle. For example, a minimum QSplitter subclass might look like this:

    \snippet doc/src/snippets/splitterhandle/splitter.h 0

    The \l{QSplitter::}{createHandle()} implementation simply constructs a
    custom splitter handle, called \c Splitter in this example:

    \snippet doc/src/snippets/splitterhandle/splitter.cpp 1

    Information about a given handle can be obtained using functions like
    orientation() and opaqueResize(), and is retrieved from its parent splitter.
    Details like these can be used to give custom handles different appearances
    depending on the splitter's orientation.

    The complexity of a custom handle subclass depends on the tasks that it
    needs to perform. A simple subclass might only provide a paintEvent()
    implementation:

    \snippet doc/src/snippets/splitterhandle/splitter.cpp 0

    In this example, a predefined gradient is set up differently depending on
    the orientation of the handle. QSplitterHandle provides a reasonable
    size hint for the handle, so the subclass does not need to provide a
    reimplementation of sizeHint() unless the handle has special size
    requirements.

    \sa QSplitter
*/

/*!
    Creates a QSplitter handle with the given \a orientation and
    QSplitter \a parent.
*/
QSplitterHandle::QSplitterHandle(Qt::Orientation orientation, QSplitter *parent)
    : QWidget(*new QSplitterHandlePrivate, parent, 0)
{
    Q_D(QSplitterHandle);
    d->s = parent;
    setOrientation(orientation);
}

/*!
    Sets the orientation of the splitter handle to \a orientation.
    This is usually propagated from the QSplitter.

    \sa QSplitter::setOrientation()
*/
void QSplitterHandle::setOrientation(Qt::Orientation orientation)
{
    Q_D(QSplitterHandle);
    d->orient = orientation;
#ifndef QT_NO_CURSOR
    setCursor(orientation == Qt::Horizontal ? Qt::SplitHCursor : Qt::SplitVCursor);
#endif
}

/*!
   Returns the handle's orientation. This is usually propagated from the QSplitter.

   \sa QSplitter::orientation()
*/
Qt::Orientation QSplitterHandle::orientation() const
{
    Q_D(const QSplitterHandle);
    return d->orient;
}


/*!
    Returns true if widgets are resized dynamically (opaquely), otherwise
    returns false. This value is controlled by the QSplitter.

    \sa QSplitter::opaqueResize()

*/
bool QSplitterHandle::opaqueResize() const
{
    Q_D(const QSplitterHandle);
    return d->s->opaqueResize();
}


/*!
    Returns the splitter associated with this splitter handle.

    \sa QSplitter::handle()
*/
QSplitter *QSplitterHandle::splitter() const
{
    return d_func()->s;
}

/*!
    Tells the splitter to move this handle to position \a pos, which is
    the distance from the left or top edge of the widget.

    Note that \a pos is also measured from the left (or top) for
    right-to-left languages. This function will map \a pos to the
    appropriate position before calling QSplitter::moveSplitter().

    \sa QSplitter::moveSplitter() closestLegalPosition()
*/
void QSplitterHandle::moveSplitter(int pos)
{
    Q_D(QSplitterHandle);
    if (d->s->isRightToLeft() && d->orient == Qt::Horizontal)
        pos = d->s->contentsRect().width() - pos;
    d->s->moveSplitter(pos, d->s->indexOf(this));
}

/*!
   Returns the closest legal position to \a pos of the splitter
   handle. The positions are measured from the left or top edge of
   the splitter, even for right-to-left languages.

   \sa QSplitter::closestLegalPosition(), moveSplitter()
*/

int QSplitterHandle::closestLegalPosition(int pos)
{
    Q_D(QSplitterHandle);
    QSplitter *s = d->s;
    if (s->isRightToLeft() && d->orient == Qt::Horizontal) {
        int w = s->contentsRect().width();
        return w - s->closestLegalPosition(w - pos, s->indexOf(this));
    }
    return s->closestLegalPosition(pos, s->indexOf(this));
}

/*!
    \reimp
*/
QSize QSplitterHandle::sizeHint() const
{
    Q_D(const QSplitterHandle);
    int hw = d->s->handleWidth();
    QStyleOption opt(0);
    opt.init(d->s);
    opt.state = QStyle::State_None;
    return parentWidget()->style()->sizeFromContents(QStyle::CT_Splitter, &opt, QSize(hw, hw), d->s)
        .expandedTo(QApplication::globalStrut());
}

/*!
    \reimp
*/
void QSplitterHandle::resizeEvent(QResizeEvent *event)
{
    Q_D(const QSplitterHandle);

    // When splitters are only 1 pixel large we increase the
    // actual grab area to five pixels

    // Note that QSplitter uses contentsRect for layouting
    // and ensures that handles are drawn on top of widgets
    // We simply use the contents margins for draggin and only
    // paint the mask area
    bool useTinyMode = (d->s->handleWidth() == 1);
    setAttribute(Qt::WA_MouseNoMask, useTinyMode);
    if (useTinyMode) {
        if (orientation() == Qt::Horizontal)
            setContentsMargins(2, 0, 2, 0);
        else
            setContentsMargins(0, 2, 0, 2);
        setMask(QRegion(contentsRect()));
    }

    QWidget::resizeEvent(event);
}

/*!
    \reimp
*/
bool QSplitterHandle::event(QEvent *event)
{
    Q_D(QSplitterHandle);
    switch(event->type()) {
    case QEvent::HoverEnter:
        d->hover = true;
        update();
        break;
    case QEvent::HoverLeave:
        d->hover = false;
        update();
        break;
    default:
        break;
    }
    return QWidget::event(event);
}

/*!
    \reimp
*/
void QSplitterHandle::mouseMoveEvent(QMouseEvent *e)
{
    Q_D(QSplitterHandle);
    if (!(e->buttons() & Qt::LeftButton))
        return;
    int pos = d->pick(parentWidget()->mapFromGlobal(e->globalPos()))
                 - d->mouseOffset;
    if (opaqueResize()) {
        moveSplitter(pos);
    } else {
        d->s->setRubberBand(closestLegalPosition(pos));
    }
}

/*!
   \reimp
*/
void QSplitterHandle::mousePressEvent(QMouseEvent *e)
{
    Q_D(QSplitterHandle);
    if (e->button() == Qt::LeftButton) {
        d->mouseOffset = d->pick(e->pos());
        d->pressed = true;
        update();
    }
}

/*!
   \reimp
*/
void QSplitterHandle::mouseReleaseEvent(QMouseEvent *e)
{
    Q_D(QSplitterHandle);
    if (!opaqueResize() && e->button() == Qt::LeftButton) {
        int pos = d->pick(parentWidget()->mapFromGlobal(e->globalPos()))
                     - d->mouseOffset;
        d->s->setRubberBand(-1);
        moveSplitter(pos);
    }
    if (e->button() == Qt::LeftButton) {
        d->pressed = false;
        update();
    }
}

/*!
   \reimp
*/
void QSplitterHandle::paintEvent(QPaintEvent *)
{
    Q_D(QSplitterHandle);
    QPainter p(this);
    QStyleOption opt(0);
    opt.rect = contentsRect();
    opt.palette = palette();
    if (orientation() == Qt::Horizontal)
        opt.state = QStyle::State_Horizontal;
    else
        opt.state = QStyle::State_None;
    if (d->hover)
        opt.state |= QStyle::State_MouseOver;
    if (d->pressed)
        opt.state |= QStyle::State_Sunken;
    if (isEnabled())
        opt.state |= QStyle::State_Enabled;
    parentWidget()->style()->drawControl(QStyle::CE_Splitter, &opt, &p, d->s);
}


int QSplitterLayoutStruct::getWidgetSize(Qt::Orientation orient)
{
    if (sizer == -1) {
        QSize s = widget->sizeHint();
        const int presizer = pick(s, orient);
        const int realsize = pick(widget->size(), orient);
        if (!s.isValid() || (widget->testAttribute(Qt::WA_Resized) && (realsize > presizer))) {
            sizer = pick(widget->size(), orient);
        } else {
            sizer = presizer;
        }
        QSizePolicy p = widget->sizePolicy();
        int sf = (orient == Qt::Horizontal) ? p.horizontalStretch() : p.verticalStretch();
        if (sf > 1)
            sizer *= sf;
    }
    return sizer;
}

int QSplitterLayoutStruct::getHandleSize(Qt::Orientation orient)
{
    return pick(handle->sizeHint(), orient);
}

void QSplitterPrivate::init()
{
    Q_Q(QSplitter);
    QSizePolicy sp(QSizePolicy::Expanding, QSizePolicy::Preferred);
    if (orient == Qt::Vertical)
        sp.transpose();
    q->setSizePolicy(sp);
    q->setAttribute(Qt::WA_WState_OwnSizePolicy, false);
}

void QSplitterPrivate::recalc(bool update)
{
    Q_Q(QSplitter);
    int n = list.count();
    /*
      Splitter handles before the first visible widget or right
      before a hidden widget must be hidden.
    */
    bool first = true;
    bool allInvisible = n != 0;
    for (int i = 0; i < n ; ++i) {
        QSplitterLayoutStruct *s = list.at(i);
        bool widgetHidden = s->widget->isHidden();
        if (allInvisible && !widgetHidden && !s->collapsed)
            allInvisible = false;
        s->handle->setHidden(first || widgetHidden);
        if (!widgetHidden)
            first = false;
    }

    if (allInvisible)
        for (int i = 0; i < n ; ++i) {
            QSplitterLayoutStruct *s = list.at(i);
            if (!s->widget->isHidden()) {
                s->collapsed = false;
                break;
            }
        }

    int fi = 2 * q->frameWidth();
    int maxl = fi;
    int minl = fi;
    int maxt = QWIDGETSIZE_MAX;
    int mint = fi;
    /*
      calculate min/max sizes for the whole splitter
    */
    bool empty = true;
    for (int j = 0; j < n; j++) {
        QSplitterLayoutStruct *s = list.at(j);

        if (!s->widget->isHidden()) {
            empty = false;
            if (!s->handle->isHidden()) {
                minl += s->getHandleSize(orient);
                maxl += s->getHandleSize(orient);
            }

            QSize minS = qSmartMinSize(s->widget);
            minl += pick(minS);
            maxl += pick(s->widget->maximumSize());
            mint = qMax(mint, trans(minS));
            int tm = trans(s->widget->maximumSize());
            if (tm > 0)
                maxt = qMin(maxt, tm);
        }
    }

    if (empty) {
        if (qobject_cast<QSplitter *>(parent)) {
            // nested splitters; be nice
            maxl = maxt = 0;
        } else {
            // QSplitter with no children yet
            maxl = QWIDGETSIZE_MAX;
        }
    } else {
        maxl = qMin<int>(maxl, QWIDGETSIZE_MAX);
    }
    if (maxt < mint)
        maxt = mint;

    if (update) {
        if (orient == Qt::Horizontal) {
            q->setMaximumSize(maxl, maxt);
            if (q->isWindow())
                q->setMinimumSize(minl,mint);
        } else {
            q->setMaximumSize(maxt, maxl);
            if (q->isWindow())
                q->setMinimumSize(mint,minl);
        }
        doResize();
        q->updateGeometry();
    } else {
        firstShow = true;
    }
}

void QSplitterPrivate::doResize()
{
    Q_Q(QSplitter);
    QRect r = q->contentsRect();
    int n = list.count();
    QVector<QLayoutStruct> a(n*2);
    int i;

    bool noStretchFactorsSet = true;
    for (i = 0; i < n; ++i) {
        QSizePolicy p = list.at(i)->widget->sizePolicy();
        int sf = orient == Qt::Horizontal ? p.horizontalStretch() : p.verticalStretch();
        if (sf != 0) {
            noStretchFactorsSet = false;
            break;
        }
    }

    int j=0;
    for (i = 0; i < n; ++i) {
        QSplitterLayoutStruct *s = list.at(i);
#ifdef QSPLITTER_DEBUG
        qDebug("widget %d hidden: %d collapsed: %d handle hidden: %d", i, s->widget->isHidden(),
               s->collapsed, s->handle->isHidden());
#endif

        a[j].init();
        if (s->handle->isHidden()) {
            a[j].maximumSize = 0;
        } else {
            a[j].sizeHint = a[j].minimumSize = a[j].maximumSize = s->getHandleSize(orient);
            a[j].empty = false;
        }
        ++j;

        a[j].init();
        if (s->widget->isHidden() || s->collapsed) {
            a[j].maximumSize = 0;
        } else {
            a[j].minimumSize = pick(qSmartMinSize(s->widget));
            a[j].maximumSize = pick(s->widget->maximumSize());
            a[j].empty = false;

            bool stretch = noStretchFactorsSet;
            if (!stretch) {
                QSizePolicy p = s->widget->sizePolicy();
                int sf = orient == Qt::Horizontal ? p.horizontalStretch() : p.verticalStretch();
                stretch = (sf != 0);
            }
            if (stretch) {
                a[j].stretch = s->getWidgetSize(orient);
                a[j].sizeHint = a[j].minimumSize;
                a[j].expansive = true;
            } else {
                a[j].sizeHint = qMax(s->getWidgetSize(orient), a[j].minimumSize);
            }
        }
        ++j;
    }

    qGeomCalc(a, 0, n*2, pick(r.topLeft()), pick(r.size()), 0);

#ifdef QSPLITTER_DEBUG
    for (i = 0; i < n*2; ++i) {
        qDebug("%*s%d: stretch %d, sh %d, minS %d, maxS %d, exp %d, emp %d -> %d, %d",
               i, "", i,
               a[i].stretch,
               a[i].sizeHint,
               a[i].minimumSize,
               a[i].maximumSize,
               a[i].expansive,
               a[i].empty,
               a[i].pos,
               a[i].size);
    }
#endif

    for (i = 0; i < n; ++i) {
        QSplitterLayoutStruct *s = list.at(i);
        setGeo(s, a[i*2+1].pos, a[i*2+1].size, false);
    }
}

void QSplitterPrivate::storeSizes()
{
    for (int i = 0; i < list.size(); ++i) {
        QSplitterLayoutStruct *sls = list.at(i);
        sls->sizer = pick(sls->rect.size());
    }
}

void QSplitterPrivate::addContribution(int index, int *min, int *max, bool mayCollapse) const
{
    QSplitterLayoutStruct *s = list.at(index);
    if (!s->widget->isHidden()) {
        if (!s->handle->isHidden()) {
            *min += s->getHandleSize(orient);
            *max += s->getHandleSize(orient);
        }
        if (mayCollapse || !s->collapsed)
            *min += pick(qSmartMinSize(s->widget));

        *max += pick(s->widget->maximumSize());
    }
}

int QSplitterPrivate::findWidgetJustBeforeOrJustAfter(int index, int delta, int &collapsibleSize) const
{
    if (delta < 0)
        index += delta;
    do {
        QWidget *w = list.at(index)->widget;
        if (!w->isHidden()) {
            if (collapsible(list.at(index)))
                collapsibleSize = pick(qSmartMinSize(w));
            return index;
        }
        index += delta;
    } while (index >= 0 && index < list.count());

    return -1;
}

/*
  For the splitter handle with index \a index, \a min and \a max give the range without collapsing any widgets,
  and \a farMin and farMax give the range with collapsing included.
*/
void QSplitterPrivate::getRange(int index, int *farMin, int *min, int *max, int *farMax) const
{
    Q_Q(const QSplitter);
    int n = list.count();
    if (index <= 0 || index >= n)
        return;

    int collapsibleSizeBefore = 0;
    int idJustBefore = findWidgetJustBeforeOrJustAfter(index, -1, collapsibleSizeBefore);

    int collapsibleSizeAfter = 0;
    int idJustAfter = findWidgetJustBeforeOrJustAfter(index, +1, collapsibleSizeAfter);

    int minBefore = 0;
    int minAfter = 0;
    int maxBefore = 0;
    int maxAfter = 0;
    int i;

    for (i = 0; i < index; ++i)
        addContribution(i, &minBefore, &maxBefore, i == idJustBefore);
    for (i = index; i < n; ++i)
        addContribution(i, &minAfter, &maxAfter, i == idJustAfter);

    QRect r = q->contentsRect();
    int farMinVal;
    int minVal;
    int maxVal;
    int farMaxVal;

    int smartMinBefore = qMax(minBefore, pick(r.size()) - maxAfter);
    int smartMaxBefore = qMin(maxBefore, pick(r.size()) - minAfter);

    minVal = pick(r.topLeft()) + smartMinBefore;
    maxVal = pick(r.topLeft()) + smartMaxBefore;

    farMinVal = minVal;
    if (minBefore - collapsibleSizeBefore >= pick(r.size()) - maxAfter)
        farMinVal -= collapsibleSizeBefore;
    farMaxVal = maxVal;
    if (pick(r.size()) - (minAfter - collapsibleSizeAfter) <= maxBefore)
        farMaxVal += collapsibleSizeAfter;

    if (farMin)
        *farMin = farMinVal;
    if (min)
        *min = minVal;
    if (max)
        *max = maxVal;
    if (farMax)
        *farMax = farMaxVal;
}

int QSplitterPrivate::adjustPos(int pos, int index, int *farMin, int *min, int *max, int *farMax) const
{
    const int Threshold = 40;

    getRange(index, farMin, min, max, farMax);

    if (pos >= *min) {
        if (pos <= *max) {
            return pos;
        } else {
            int delta = pos - *max;
            int width = *farMax - *max;

            if (delta > width / 2 && delta >= qMin(Threshold, width)) {
                return *farMax;
            } else {
                return *max;
            }
        }
    } else {
        int delta = *min - pos;
        int width = *min - *farMin;

        if (delta > width / 2 && delta >= qMin(Threshold, width)) {
            return *farMin;
        } else {
            return *min;
        }
    }
}

bool QSplitterPrivate::collapsible(QSplitterLayoutStruct *s) const
{
    if (s->collapsible != Default) {
        return (bool)s->collapsible;
    } else {
        return childrenCollapsible;
    }
}

void QSplitterPrivate::updateHandles()
{
    Q_Q(QSplitter);
    recalc(q->isVisible());
}

void QSplitterPrivate::setSizes_helper(const QList<int> &sizes, bool clampNegativeSize)
{
    int j = 0;

    for (int i = 0; i < list.size(); ++i) {
        QSplitterLayoutStruct *s = list.at(i);

        s->collapsed = false;
        s->sizer = sizes.value(j++);
        if (clampNegativeSize && s->sizer < 0)
            s->sizer = 0;
        int smartMinSize = pick(qSmartMinSize(s->widget));

        // Make sure that we reset the collapsed state.
        if (s->sizer == 0) {
            if (collapsible(s) && smartMinSize > 0) {
                s->collapsed = true;
            } else {
                s->sizer = smartMinSize;
            }
        } else {
            if (s->sizer < smartMinSize)
                s->sizer = smartMinSize;
        }
    }
    doResize();
}

void QSplitterPrivate::setGeo(QSplitterLayoutStruct *sls, int p, int s, bool allowCollapse)
{
    Q_Q(QSplitter);
    QWidget *w = sls->widget;
    QRect r;
    QRect contents = q->contentsRect();
    if (orient == Qt::Horizontal) {
        r.setRect(p, contents.y(), s, contents.height());
    } else {
        r.setRect(contents.x(), p, contents.width(), s);
    }
    sls->rect = r;

    int minSize = pick(qSmartMinSize(w));

    if (orient == Qt::Horizontal && q->isRightToLeft())
        r.moveRight(contents.width() - r.left());

    if (allowCollapse)
        sls->collapsed = s <= 0 && minSize > 0 && !w->isHidden();

    //   Hide the child widget, but without calling hide() so that
    //   the splitter handle is still shown.
    if (sls->collapsed)
        r.moveTopLeft(QPoint(-r.width()-1, -r.height()-1));

    w->setGeometry(r);

    if (!sls->handle->isHidden()) {
        QSplitterHandle *h = sls->handle;
        QSize hs = h->sizeHint();
        int left, top, right, bottom;
        h->getContentsMargins(&left, &top, &right, &bottom);
        if (orient==Qt::Horizontal) {
            if (q->isRightToLeft())
                p = contents.width() - p + hs.width();
            h->setGeometry(p-hs.width() - left, contents.y(), hs.width() + left + right, contents.height());
        } else {
            h->setGeometry(contents.x(), p-hs.height() - top, contents.width(), hs.height() + top + bottom);
        }
    }
}

void QSplitterPrivate::doMove(bool backwards, int hPos, int index, int delta, bool mayCollapse,
                              int *positions, int *widths)
{
    if (index < 0 || index >= list.count())
        return;

#ifdef QSPLITTER_DEBUG
    qDebug() << "QSplitterPrivate::doMove" << backwards << hPos << index << delta << mayCollapse;
#endif

    QSplitterLayoutStruct *s = list.at(index);
    QWidget *w = s->widget;

    int nextId = backwards ? index - delta : index + delta;

    if (w->isHidden()) {
        doMove(backwards, hPos, nextId, delta, collapsible(nextId), positions, widths);
    } else {
        int hs =s->handle->isHidden() ? 0 : s->getHandleSize(orient);

        int  ws = backwards ? hPos - pick(s->rect.topLeft())
                 : pick(s->rect.bottomRight()) - hPos -hs + 1;
        if (ws > 0 || (!s->collapsed && !mayCollapse)) {
            ws = qMin(ws, pick(w->maximumSize()));
            ws = qMax(ws, pick(qSmartMinSize(w)));
        } else {
            ws = 0;
        }
        positions[index] = backwards ? hPos - ws : hPos + hs;
        widths[index] = ws;
        doMove(backwards, backwards ? hPos - ws - hs : hPos + hs + ws, nextId, delta,
               collapsible(nextId), positions, widths);
    }

}

QSplitterLayoutStruct *QSplitterPrivate::findWidget(QWidget *w) const
{
    for (int i = 0; i < list.size(); ++i) {
        if (list.at(i)->widget == w)
            return list.at(i);
    }
    return 0;
}

#ifdef QT3_SUPPORT
static void setStretch(QWidget *w, int sf)
{
    QSizePolicy sp = w->sizePolicy();
    sp.setHorizontalStretch(sf);
    sp.setVerticalStretch(sf);
    w->setSizePolicy(sp);
}

static int getStretch(const QWidget *w)
{
    QSizePolicy sp = w->sizePolicy();
    return qMax(sp.horizontalStretch(), sp.verticalStretch());
}

void QSplitter::setResizeMode(QWidget *w, ResizeMode mode)
{
    /*
        Internal comment:

        This function tries to simulate the Qt 3.x ResizeMode
        behavior using QSizePolicy stretch factors. This isn't easy,
        because the default \l ResizeMode was \l Stretch, not \l
        KeepSize, whereas the default stetch factor is 0.

        So what we do is this: When the user calls setResizeMode()
        the first time, we iterate through all the child widgets and
        set their stretch factors to 1. Later on, if children are
        added (using addWidget()), their stretch factors are also set
        to 1.

        There is just one problem left: Often, setResizeMode() is
        called \e{before} addWidget(), because addWidget() is called
        from the event loop. In that case, we use a special value,
        243, instead of 0 to prevent 0 from being overwritten with 1
        in addWidget(). This is a wicked hack, but fortunately it
        only occurs as a result of calling a \c QT3_SUPPORT function.
    */

    Q_D(QSplitter);
    bool metWidget = false;
    if (!d->compatMode) {
        d->compatMode = true;
        for (int i = 0; i < d->list.size(); ++i) {
            QSplitterLayoutStruct *s = d->list.at(i);
            if (s->widget == w)
                metWidget = true;
            if (getStretch(s->widget) == 0)
                setStretch(s->widget, 1);
        }
    }
    int sf;
    if (mode == KeepSize)
        sf = metWidget ? 0 : 243;
    else
        sf = 1;
    setStretch(w, sf);
}

/*!
    Use one of the constructors that doesn't take the \a name
    argument and then use setObjectName() instead.
*/
QSplitter::QSplitter(QWidget *parent, const char *name)
    : QFrame(*new QSplitterPrivate, parent)
{
    Q_D(QSplitter);
    setObjectName(QString::fromAscii(name));
    d->orient = Qt::Horizontal;
    d->init();
}


/*!
    Use one of the constructors that don't take the \a name argument
    and then use setObjectName() instead.
*/
QSplitter::QSplitter(Qt::Orientation orientation, QWidget *parent, const char *name)
    : QFrame(*new QSplitterPrivate, parent)
{
    Q_D(QSplitter);
    setObjectName(QString::fromAscii(name));
    d->orient = orientation;
    d->init();
}
#endif

/*!
    \internal
*/
void QSplitterPrivate::insertWidget_helper(int index, QWidget *widget, bool show)
{
    Q_Q(QSplitter);
    QBoolBlocker b(blockChildAdd);
    bool needShow = show && q->isVisible() &&
                    !(widget->isHidden() && widget->testAttribute(Qt::WA_WState_ExplicitShowHide));
    if (widget->parentWidget() != q)
        widget->setParent(q);
    if (needShow)
        widget->show();
    insertWidget(index, widget);
    recalc(q->isVisible());
}

/*
    Inserts the widget \a w at position \a index in the splitter's list of widgets.

    If \a w is already in the splitter, it will be moved to the new position.
*/

QSplitterLayoutStruct *QSplitterPrivate::insertWidget(int index, QWidget *w)
{
    Q_Q(QSplitter);
    QSplitterLayoutStruct *sls = 0;
    int i;
    int last = list.count();
    for (i = 0; i < list.size(); ++i) {
        QSplitterLayoutStruct *s = list.at(i);
        if (s->widget == w) {
            sls = s;
            --last;
            break;
        }
    }
    if (index < 0 || index > last)
        index = last;

    if (sls) {
        list.move(i,index);
    } else {
        QSplitterHandle *newHandle = 0;
        sls = new QSplitterLayoutStruct;
        QString tmp = QLatin1String("qt_splithandle_");
        tmp += w->objectName();
        newHandle = q->createHandle();
        newHandle->setObjectName(tmp);
        sls->handle = newHandle;
        sls->widget = w;
        w->lower();
        list.insert(index,sls);

        if (newHandle && q->isVisible())
            newHandle->show(); // will trigger sending of post events

#ifdef QT3_SUPPORT
        if (compatMode) {
            int sf = getStretch(sls->widget);
            if (sf == 243)
                setStretch(sls->widget, 0);
            else if (sf == 0)
                setStretch(sls->widget, 1);
        }
#endif
    }
    return sls;
}

/*!
    \class QSplitter
    \brief The QSplitter class implements a splitter widget.

    \ingroup organizers


    A splitter lets the user control the size of child widgets by dragging the
    boundary between the children. Any number of widgets may be controlled by a
    single splitter. The typical use of a QSplitter is to create several
    widgets and add them using insertWidget() or addWidget().

    The following example will show a QListView, QTreeView, and
    QTextEdit side by side, with two splitter handles:

    \snippet doc/src/snippets/splitter/splitter.cpp 0

    If a widget is already inside a QSplitter when insertWidget() or
    addWidget() is called, it will move to the new position. This can be used
    to reorder widgets in the splitter later. You can use indexOf(),
    widget(), and count() to get access to the widgets inside the splitter.

    A default QSplitter lays out its children horizontally (side by side); you
    can use setOrientation(Qt::Vertical) to lay its
    children out vertically.

    By default, all widgets can be as large or as small as the user
    wishes, between the \l minimumSizeHint() (or \l minimumSize())
    and \l maximumSize() of the widgets.

    QSplitter resizes its children dynamically by default. If you
    would rather have QSplitter resize the children only at the end of
    a resize operation, call setOpaqueResize(false).

    The initial distribution of size between the widgets is determined by
    multiplying the initial size with the stretch factor.
    You can also use setSizes() to set the sizes
    of all the widgets. The function sizes() returns the sizes set by the user.
    Alternatively, you can save and restore the sizes of the widgets from a
    QByteArray using saveState() and restoreState() respectively.

    When you hide() a child its space will be distributed among the
    other children. It will be reinstated when you show() it again.

    \sa QSplitterHandle, QHBoxLayout, QVBoxLayout, QTabWidget
*/


/*!
    Constructs a horizontal splitter with the \a parent
    argument passed on to the QFrame constructor.

    \sa setOrientation()
*/
QSplitter::QSplitter(QWidget *parent)
    : QFrame(*new QSplitterPrivate, parent)
{
    Q_D(QSplitter);
    d->orient = Qt::Horizontal;
    d->init();
}


/*!
    Constructs a splitter with the given \a orientation and \a parent.

    \sa setOrientation()
*/
QSplitter::QSplitter(Qt::Orientation orientation, QWidget *parent)
    : QFrame(*new QSplitterPrivate, parent)
{
    Q_D(QSplitter);
    d->orient = orientation;
    d->init();
}


/*!
    Destroys the splitter. All children are deleted.
*/

QSplitter::~QSplitter()
{
    Q_D(QSplitter);
    delete d->rubberBand;
    while (!d->list.isEmpty())
        delete d->list.takeFirst();
}

/*!
    Updates the splitter's state. You should not need to call this
    function.
*/
void QSplitter::refresh()
{
    Q_D(QSplitter);
    d->recalc(true);
}

/*!
    \property QSplitter::orientation
    \brief the orientation of the splitter

    By default the orientation is horizontal (i.e., the widgets are
    laid out side by side). The possible orientations are
    Qt::Horizontal and Qt::Vertical.

    \sa QSplitterHandle::orientation()
*/

void QSplitter::setOrientation(Qt::Orientation orientation)
{
    Q_D(QSplitter);
    if (d->orient == orientation)
        return;

    if (!testAttribute(Qt::WA_WState_OwnSizePolicy)) {
        QSizePolicy sp = sizePolicy();
        sp.transpose();
        setSizePolicy(sp);
        setAttribute(Qt::WA_WState_OwnSizePolicy, false);
    }

    d->orient = orientation;

    for (int i = 0; i < d->list.size(); ++i) {
        QSplitterLayoutStruct *s = d->list.at(i);
        s->handle->setOrientation(orientation);
    }
    d->recalc(isVisible());
}

Qt::Orientation QSplitter::orientation() const
{
    Q_D(const QSplitter);
    return d->orient;
}

/*!
    \property QSplitter::childrenCollapsible
    \brief whether child widgets can be resized down to size 0 by the user

    By default, children are collapsible. It is possible to enable
    and disable the collapsing of individual children using
    setCollapsible().

    \sa setCollapsible()
*/

void QSplitter::setChildrenCollapsible(bool collapse)
{
    Q_D(QSplitter);
    d->childrenCollapsible = collapse;
}

bool QSplitter::childrenCollapsible() const
{
    Q_D(const QSplitter);
    return d->childrenCollapsible;
}

/*!
    Sets whether the child widget at index \a index is collapsible to \a collapse.

    By default, children are collapsible, meaning that the user can
    resize them down to size 0, even if they have a non-zero
    minimumSize() or minimumSizeHint(). This behavior can be changed
    on a per-widget basis by calling this function, or globally for
    all the widgets in the splitter by setting the \l
    childrenCollapsible property.

    \sa childrenCollapsible
*/

void QSplitter::setCollapsible(int index, bool collapse)
{
    Q_D(QSplitter);

    if (index < 0 || index >= d->list.size()) {
        qWarning("QSplitter::setCollapsible: Index %d out of range", index);
        return;
    }
    d->list.at(index)->collapsible = collapse ? 1 : 0;
}

/*!
    Returns true if the widget at \a index is collapsible, otherwise returns false
*/
bool QSplitter::isCollapsible(int index) const
{
    Q_D(const QSplitter);
    if (index < 0 || index >= d->list.size()) {
        qWarning("QSplitter::isCollapsible: Index %d out of range", index);
        return false;
    }
    return d->list.at(index)->collapsible;
}

/*!
    \reimp
*/
void QSplitter::resizeEvent(QResizeEvent *)
{
    Q_D(QSplitter);
    d->doResize();
}

/*!
    Adds the given \a widget to the splitter's layout after all the other
    items.

    If \a widget is already in the splitter, it will be moved to the new position.

    \sa insertWidget() widget() indexOf()
*/
void QSplitter::addWidget(QWidget *widget)
{
    Q_D(QSplitter);
    insertWidget(d->list.count(), widget);
}

/*!
    Inserts the \a widget specified into the splitter's layout at the
    given \a index.

    If \a widget is already in the splitter, it will be moved to the new position.

    if \a index is an invalid index, then the widget will be inserted at the end.

    \sa addWidget() indexOf() widget()
*/
void QSplitter::insertWidget(int index, QWidget *widget)
{
    Q_D(QSplitter);
    d->insertWidget_helper(index, widget, true);
}

/*!
    \fn int QSplitter::indexOf(QWidget *widget) const

    Returns the index in the splitter's layout of the specified \a widget. This
    also works for handles.

    Handles are numbered from 0. There are as many handles as there
    are child widgets, but the handle at position 0 is always hidden.


    \sa count(), widget()
*/
int QSplitter::indexOf(QWidget *w) const
{
    Q_D(const QSplitter);
    for (int i = 0; i < d->list.size(); ++i) {
        QSplitterLayoutStruct *s = d->list.at(i);
        if (s->widget == w || s->handle == w)
            return i;
    }
    return -1;
}

/*!
    Returns a new splitter handle as a child widget of this splitter.
    This function can be reimplemented in subclasses to provide support
    for custom handles.

    \sa handle(), indexOf()
*/
QSplitterHandle *QSplitter::createHandle()
{
    Q_D(QSplitter);
    return new QSplitterHandle(d->orient, this);
}

/*!
    Returns the handle to the left (or above) for the item in the
    splitter's layout at the given \a index. The handle at index 0 is
    always hidden.

    For right-to-left languages such as Arabic and Hebrew, the layout
    of horizontal splitters is reversed. The handle will be to the
    right of the widget at \a index.

    \sa count(), widget(), indexOf(), createHandle(), setHandleWidth()
*/
QSplitterHandle *QSplitter::handle(int index) const
{
    Q_D(const QSplitter);
    if (index < 0 || index >= d->list.size())
        return 0;
    return d->list.at(index)->handle;
}

/*!
    Returns the widget at the given \a index in the splitter's layout.

    \sa count(), handle(), indexOf(), insertWidget()
*/
QWidget *QSplitter::widget(int index) const
{
    Q_D(const QSplitter);
    if (index < 0 || index >= d->list.size())
        return 0;
    return d->list.at(index)->widget;
}

/*!
    Returns the number of widgets contained in the splitter's layout.

    \sa widget(), handle()
*/
int QSplitter::count() const
{
    Q_D(const QSplitter);
    return d->list.count();
}

/*!
    \reimp

    Tells the splitter that the child widget described by \a c has been
    inserted or removed.

    This method is also used to handle the situation where a widget is created
    with the splitter as a parent but not explicitly added with insertWidget()
    or addWidget(). This is for compatibility and not the recommended way of
    putting widgets into a splitter in new code. Please use insertWidget() or
    addWidget() in new code.

    \sa addWidget() insertWidget()
*/

void QSplitter::childEvent(QChildEvent *c)
{
    Q_D(QSplitter);
    if (!c->child()->isWidgetType())
        return;
    QWidget *w = static_cast<QWidget*>(c->child());
    if (c->added() && !d->blockChildAdd && !w->isWindow() && !d->findWidget(w)) {
        d->insertWidget_helper(d->list.count(), w, false);
    } else if (c->polished() && !d->blockChildAdd) {
        if (isVisible() && !(w->isHidden() && w->testAttribute(Qt::WA_WState_ExplicitShowHide)))
            w->show();
    } else if (c->type() == QEvent::ChildRemoved) {
        for (int i = 0; i < d->list.size(); ++i) {
            QSplitterLayoutStruct *s = d->list.at(i);
            if (s->widget == w) {
                d->list.removeAt(i);
                delete s;
                d->recalc(isVisible());
                return;
            }
        }
    }
}


/*!
    Displays a rubber band at position \a pos. If \a pos is negative, the
    rubber band is removed.
*/

void QSplitter::setRubberBand(int pos)
{
    Q_D(QSplitter);
    if (pos < 0) {
        if (d->rubberBand)
            d->rubberBand->deleteLater();
        return;
    }
    QRect r = contentsRect();
    const int rBord = 3; // customizable?
    int hw = handleWidth();
    if (!d->rubberBand) {
        QBoolBlocker b(d->blockChildAdd);
        d->rubberBand = new QRubberBand(QRubberBand::Line, this);
        // For accessibility to identify this special widget.
        d->rubberBand->setObjectName(QLatin1String("qt_rubberband"));
    }

    const QRect newGeom = d->orient == Qt::Horizontal ? QRect(QPoint(pos + hw / 2 - rBord, r.y()), QSize(2 * rBord, r.height()))
                                                      : QRect(QPoint(r.x(), pos + hw / 2 - rBord), QSize(r.width(), 2 * rBord));
    d->rubberBand->setGeometry(newGeom);
    d->rubberBand->show();
}

/*!
    \reimp
*/

bool QSplitter::event(QEvent *e)
{
    Q_D(QSplitter);
    switch (e->type()) {
    case QEvent::Hide:
        // Reset firstShow to false here since things can be done to the splitter in between
        if (!d->firstShow)
            d->firstShow = true;
        break;
    case QEvent::Show:
        if (!d->firstShow)
            break;
        d->firstShow = false;
        // fall through
    case QEvent::HideToParent:
    case QEvent::ShowToParent:
    case QEvent::LayoutRequest:
#ifdef QT3_SUPPORT
    case QEvent::LayoutHint:
#endif
        d->recalc(isVisible());
        break;
    default:
        ;
    }
    return QWidget::event(e);
}

/*!
    \fn QSplitter::splitterMoved(int pos, int index)

    This signal is emitted when the splitter handle at a particular \a
    index has been moved to position \a pos.

    For right-to-left languages such as Arabic and Hebrew, the layout
    of horizontal splitters is reversed. \a pos is then the
    distance from the right edge of the widget.

    \sa moveSplitter()
*/

/*!
    Moves the left or top edge of the splitter handle at \a index as
    close as possible to position \a pos, which is the distance from the
    left or top edge of the widget.

    For right-to-left languages such as Arabic and Hebrew, the layout
    of horizontal splitters is reversed. \a pos is then the distance
    from the right edge of the widget.

    \sa splitterMoved(), closestLegalPosition(), getRange()
*/
void QSplitter::moveSplitter(int pos, int index)
{
    Q_D(QSplitter);
    QSplitterLayoutStruct *s = d->list.at(index);
    int farMin;
    int min;
    int max;
    int farMax;

#ifdef QSPLITTER_DEBUG
    int debugp = pos;
#endif

    pos = d->adjustPos(pos, index, &farMin, &min, &max, &farMax);
    int oldP = d->pick(s->rect.topLeft());
#ifdef QSPLITTER_DEBUG
    qDebug() << "QSplitter::moveSplitter" << debugp << index << "adjusted" << pos << "oldP" << oldP;
#endif

    QVarLengthArray<int, 32> poss(d->list.count());
    QVarLengthArray<int, 32> ws(d->list.count());
    bool upLeft;

    d->doMove(false, pos, index, +1, (d->collapsible(s) && (pos > max)), poss.data(), ws.data());
    d->doMove(true, pos, index - 1, +1, (d->collapsible(index - 1) && (pos < min)), poss.data(), ws.data());
    upLeft = (pos < oldP);

    int wid, delta, count = d->list.count();
    if (upLeft) {
        wid = 0;
        delta = 1;
    } else {
        wid = count - 1;
        delta = -1;
    }
    for (; wid >= 0 && wid < count; wid += delta) {
        QSplitterLayoutStruct *sls = d->list.at( wid );
        if (!sls->widget->isHidden())
            d->setGeo(sls, poss[wid], ws[wid], true);
    }
    d->storeSizes();

    emit splitterMoved(pos, index);
}


/*!
    Returns the valid range of the splitter with index \a index in
    *\a{min} and *\a{max} if \a min and \a max are not 0.
*/

void QSplitter::getRange(int index, int *min, int *max) const
{
    Q_D(const QSplitter);
    d->getRange(index, min, 0, 0, max);
}


/*!
    Returns the closest legal position to \a pos of the widget with index
    \a index.

    For right-to-left languages such as Arabic and Hebrew, the layout
    of horizontal splitters is reversed. Positions are then measured
    from the right edge of the widget.

    \sa getRange()
*/

int QSplitter::closestLegalPosition(int pos, int index)
{
    Q_D(QSplitter);
    int x, i, n, u;
    return d->adjustPos(pos, index, &u, &n, &i, &x);
}

/*!
    \property QSplitter::opaqueResize
    \brief whether resizing is opaque

    Opaque resizing is on by default.
*/

bool QSplitter::opaqueResize() const
{
    Q_D(const QSplitter);
    return d->opaque;
}


void QSplitter::setOpaqueResize(bool on)
{
    Q_D(QSplitter);
    d->opaque = on;
}

#ifdef QT3_SUPPORT
/*!
    \fn void QSplitter::moveToFirst(QWidget *widget)

    Use insertWidget(0, \a widget) instead.
*/


/*!
    \fn void QSplitter::moveToLast(QWidget *widget)

    Use addWidget(\a widget) instead.
*/

/*!
    \fn void QSplitter::setResizeMode(QWidget *widget, ResizeMode mode)

    Use setStretchFactor() instead.

    \oldcode
        splitter->setResizeMode(firstChild, QSplitter::KeepSize);
        splitter->setResizeMode(secondChild, QSplitter::Stretch);
    \newcode
        splitter->setStretchFactor(splitter->indexOf(firstChild), 0);
        splitter->setStretchFactor(splitter->indexOf(secondChild), 1);
    \endcode
*/

/*!
    \enum QSplitter::ResizeMode
    \compat

    This enum describes the different resizing behaviors child
    widgets can have:

    \value Auto   The widget will be resized according to the stretch factors set in its sizePolicy().
    \value Stretch  The widget will be resized when the splitter itself is resized.
    \value KeepSize  QSplitter will try to keep the widget's size unchanged.
    \value FollowSizeHint  QSplitter will resize the widget when the widget's size hint changes.

    Use setStretchFactor() instead.
*/

/*!
    \fn void QSplitter::setCollapsible(QWidget *widget, bool collapsible)

    Use setCollapsible(indexOf(\a widget, \a collapsible)) instead.
*/

/*!
    \fn void QSplitter::setMargin(int margin)
    Sets the width of the margin around the contents of the widget to \a margin.

    Use QWidget::setContentsMargins() instead.
    \sa margin(), QWidget::setContentsMargins()
*/

/*!
    \fn int QSplitter::margin() const
    Returns the width of the margin around the contents of the widget.

    Use QWidget::getContentsMargins() instead.
    \sa setMargin(), QWidget::getContentsMargins()
*/

#endif

/*!
    \reimp
*/
QSize QSplitter::sizeHint() const
{
    Q_D(const QSplitter);
    ensurePolished();
    int l = 0;
    int t = 0;
    for (int i = 0; i < d->list.size(); ++i) {
        QWidget *w = d->list.at(i)->widget;
        if (w->isHidden())
            continue;
        QSize s = w->sizeHint();
        if (s.isValid()) {
            l += d->pick(s);
            t = qMax(t, d->trans(s));
        }
    }
    return orientation() == Qt::Horizontal ? QSize(l, t) : QSize(t, l);
}


/*!
    \reimp
*/

QSize QSplitter::minimumSizeHint() const
{
    Q_D(const QSplitter);
    ensurePolished();
    int l = 0;
    int t = 0;

    for (int i = 0; i < d->list.size(); ++i) {
        QSplitterLayoutStruct *s = d->list.at(i);
        if (!s || !s->widget)
            continue;
        if (s->widget->isHidden())
            continue;
        QSize widgetSize = qSmartMinSize(s->widget);
        if (widgetSize.isValid()) {
            l += d->pick(widgetSize);
            t = qMax(t, d->trans(widgetSize));
        }
        if (!s->handle || s->handle->isHidden())
            continue;
        QSize splitterSize = s->handle->sizeHint();
        if (splitterSize.isValid()) {
            l += d->pick(splitterSize);
            t = qMax(t, d->trans(splitterSize));
        }
    }
    return orientation() == Qt::Horizontal ? QSize(l, t) : QSize(t, l);
}


/*!
    Returns a list of the size parameters of all the widgets in this splitter.

    If the splitter's orientation is horizontal, the list contains the
    widgets width in pixels, from left to right; if the orientation is
    vertical, the list contains the widgets height in pixels,
    from top to bottom.

    Giving the values to another splitter's setSizes() function will
    produce a splitter with the same layout as this one.

    Note that invisible widgets have a size of 0.

    \sa setSizes()
*/

QList<int> QSplitter::sizes() const
{
    Q_D(const QSplitter);
    ensurePolished();

    QList<int> list;
    for (int i = 0; i < d->list.size(); ++i) {
        QSplitterLayoutStruct *s = d->list.at(i);
        list.append(d->pick(s->rect.size()));
    }
    return list;
}

/*!
    Sets the child widgets respective sizes to the values given in the \a list.

    If the splitter is horizontal, the values set the widths of each
    widget in pixels, from left to right. If the splitter is vertical, the
    heights of each widget is set, from top to bottom.

    Extra values in the \a list are ignored. If \a list contains too few
    values, the result is undefined but the program will still be well-behaved.

    The overall size of the splitter widget is not affected.
    Instead, any additional/missing space is distributed amongst the
    widgets according to the relative weight of the sizes.

    If you specify a size of 0, the widget will be invisible. The size policies
    of the widgets are preserved. That is, a value smaller then the minimal size
    hint of the respective widget will be replaced by the value of the hint.

    \sa sizes()
*/

void QSplitter::setSizes(const QList<int> &list)
{
    Q_D(QSplitter);
    d->setSizes_helper(list, true);
}

/*!
    \property QSplitter::handleWidth
    \brief the width of the splitter handles

    By default, this property contains a value that depends on the user's platform
    and style preferences.

    If you set handleWidth to 1, the actual grab area will grow to overlap a
    few pixels of it's respective widgets.
*/

int QSplitter::handleWidth() const
{
    Q_D(const QSplitter);
    if (d->handleWidth > 0) {
        return d->handleWidth;
    } else {
        return style()->pixelMetric(QStyle::PM_SplitterWidth, 0, this);
    }
}

void QSplitter::setHandleWidth(int width)
{
    Q_D(QSplitter);
    d->handleWidth = width;
    d->updateHandles();
}

/*!
    \reimp
*/
void QSplitter::changeEvent(QEvent *ev)
{
    Q_D(QSplitter);
    if(ev->type() == QEvent::StyleChange)
        d->updateHandles();
    QFrame::changeEvent(ev);
}

static const qint32 SplitterMagic = 0xff;

/*!
    Saves the state of the splitter's layout.

    Typically this is used in conjunction with QSettings to remember the size
    for a future session. A version number is stored as part of the data.
    Here is an example:

    \snippet doc/src/snippets/splitter/splitter.cpp 1

    \sa restoreState()
*/
QByteArray QSplitter::saveState() const
{
    Q_D(const QSplitter);
    int version = 0;
    QByteArray data;
    QDataStream stream(&data, QIODevice::WriteOnly);

    stream << qint32(SplitterMagic);
    stream << qint32(version);
    QList<int> list;
    for (int i = 0; i < d->list.size(); ++i) {
        QSplitterLayoutStruct *s = d->list.at(i);
        list.append(s->sizer);
    }
    stream << list;
    stream << childrenCollapsible();
    stream << qint32(handleWidth());
    stream << opaqueResize();
    stream << qint32(orientation());
    return data;
}

/*!
    Restores the splitter's layout to the \a state specified.
    Returns true if the state is restored; otherwise returns false.

    Typically this is used in conjunction with QSettings to restore the size
    from a past session. Here is an example:

    Restore the splitters's state:

    \snippet doc/src/snippets/splitter/splitter.cpp 2

    A failure to restore the splitter's layout may result from either
    invalid or out-of-date data in the supplied byte array.

    \sa saveState()
*/
bool QSplitter::restoreState(const QByteArray &state)
{
    Q_D(QSplitter);
    int version = 0;
    QByteArray sd = state;
    QDataStream stream(&sd, QIODevice::ReadOnly);
    QList<int> list;
    bool b;
    qint32 i;
    qint32 marker;
    qint32 v;

    stream >> marker;
    stream >> v;
    if (marker != SplitterMagic || v != version)
        return false;

    stream >> list;
    d->setSizes_helper(list, false);

    stream >> b;
    setChildrenCollapsible(b);

    stream >> i;
    setHandleWidth(i);

    stream >> b;
    setOpaqueResize(b);

    stream >> i;
    setOrientation(Qt::Orientation(i));
    d->doResize();

    return true;
}

/*!
    Updates the size policy of the widget at position \a index to
    have a stretch factor of \a stretch.

    \a stretch is not the effective stretch factor; the effective
    stretch factor is calculated by taking the initial size of the 
    widget and multiplying it with \a stretch.

    This function is provided for convenience. It is equivalent to

    \snippet doc/src/snippets/code/src_gui_widgets_qsplitter.cpp 0

    \sa setSizes(), widget()
*/
void QSplitter::setStretchFactor(int index, int stretch)
{
    Q_D(QSplitter);
    if (index <= -1 || index >= d->list.count())
        return;

    QWidget *widget = d->list.at(index)->widget;
    QSizePolicy sp = widget->sizePolicy();
    sp.setHorizontalStretch(stretch);
    sp.setVerticalStretch(stretch);
    widget->setSizePolicy(sp);
}


//#ifdef QT3_SUPPORT
#ifndef QT_NO_TEXTSTREAM
/*!
    \relates QSplitter
    \obsolete

    Use \a ts << \a{splitter}.saveState() instead.
*/

QTextStream& operator<<(QTextStream& ts, const QSplitter& splitter)
{
    ts << splitter.saveState() << endl;
    return ts;
}

/*!
    \relates QSplitter
    \obsolete

    Use \a ts >> \a{splitter}.restoreState() instead.
*/

QTextStream& operator>>(QTextStream& ts, QSplitter& splitter)
{
    QString line = ts.readLine();
    line = line.simplified();
    line.replace(QLatin1Char(' '), QString());
    line = line.toUpper();

    splitter.restoreState(line.toAscii());
    return ts;
}
#endif // QT_NO_TEXTSTREAM
//#endif // QT3_SUPPORT

QT_END_NAMESPACE

#endif // QT_NO_SPLITTER