summaryrefslogtreecommitdiffstats
path: root/src/gui/widgets/qdockwidget.cpp
blob: 0e434be99d77ff50e0ff3227f0e1c5210e6c6d40 (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
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qdockwidget.h"

#ifndef QT_NO_DOCKWIDGET
#include <qaction.h>
#include <qapplication.h>
#include <qdesktopwidget.h>
#include <qdrawutil.h>
#include <qevent.h>
#include <qfontmetrics.h>
#include <qmainwindow.h>
#include <qrubberband.h>
#include <qstylepainter.h>
#include <qtoolbutton.h>
#include <qdebug.h>

#include <private/qwidgetresizehandler_p.h>

#include "qdockwidget_p.h"
#include "qmainwindowlayout_p.h"
#ifdef Q_WS_MAC
#include <private/qapplication_p.h>
#include <private/qt_mac_p.h>
#include <qmacstyle_mac.h>
#endif

QT_BEGIN_NAMESPACE

extern QString qt_setWindowTitle_helperHelper(const QString&, const QWidget*); // qwidget.cpp

static inline bool hasFeature(const QDockWidgetPrivate *priv, QDockWidget::DockWidgetFeature feature)
{ return (priv->features & feature) == feature; }

static inline bool hasFeature(const QDockWidget *dockwidget, QDockWidget::DockWidgetFeature feature)
{ return (dockwidget->features() & feature) == feature; }


/*
    A Dock Window:

    [+] is the float button
    [X] is the close button

    +-------------------------------+
    | Dock Window Title       [+][X]|
    +-------------------------------+
    |                               |
    | place to put the single       |
    | QDockWidget child (this space |
    | does not yet have a name)     |
    |                               |
    |                               |
    |                               |
    |                               |
    |                               |
    |                               |
    |                               |
    |                               |
    |                               |
    +-------------------------------+

*/

/******************************************************************************
** QDockWidgetTitleButton
*/

class QDockWidgetTitleButton : public QAbstractButton
{
    Q_OBJECT

public:
    QDockWidgetTitleButton(QDockWidget *dockWidget);

    QSize sizeHint() const;
    inline QSize minimumSizeHint() const
    { return sizeHint(); }

    void enterEvent(QEvent *event);
    void leaveEvent(QEvent *event);
    void paintEvent(QPaintEvent *event);
};


QDockWidgetTitleButton::QDockWidgetTitleButton(QDockWidget *dockWidget)
    : QAbstractButton(dockWidget)
{
    setFocusPolicy(Qt::NoFocus);
}

QSize QDockWidgetTitleButton::sizeHint() const
{
    ensurePolished();

    int size = 2*style()->pixelMetric(QStyle::PM_DockWidgetTitleBarButtonMargin, 0, this);
    if (!icon().isNull()) {
        int iconSize = style()->pixelMetric(QStyle::PM_SmallIconSize, 0, this);
        QSize sz = icon().actualSize(QSize(iconSize, iconSize));
        size += qMax(sz.width(), sz.height());
    }

    return QSize(size, size);
}

void QDockWidgetTitleButton::enterEvent(QEvent *event)
{
    if (isEnabled()) update();
    QAbstractButton::enterEvent(event);
}

void QDockWidgetTitleButton::leaveEvent(QEvent *event)
{
    if (isEnabled()) update();
    QAbstractButton::leaveEvent(event);
}

void QDockWidgetTitleButton::paintEvent(QPaintEvent *)
{
    QPainter p(this);

    QRect r = rect();
    QStyleOptionToolButton opt;
    opt.init(this);
    opt.state |= QStyle::State_AutoRaise;

    if (style()->styleHint(QStyle::SH_DockWidget_ButtonsHaveFrame, 0, this))
    {
        if (isEnabled() && underMouse() && !isChecked() && !isDown())
            opt.state |= QStyle::State_Raised;
        if (isChecked())
            opt.state |= QStyle::State_On;
        if (isDown())
            opt.state |= QStyle::State_Sunken;
        style()->drawPrimitive(QStyle::PE_PanelButtonTool, &opt, &p, this);
    }

    opt.icon = icon();
    opt.subControls = 0;
    opt.activeSubControls = 0;
    opt.features = QStyleOptionToolButton::None;
    opt.arrowType = Qt::NoArrow;
    int size = style()->pixelMetric(QStyle::PM_SmallIconSize, 0, this);
    opt.iconSize = QSize(size, size);
    style()->drawComplexControl(QStyle::CC_ToolButton, &opt, &p, this);
}

/******************************************************************************
** QDockWidgetLayout
*/

QDockWidgetLayout::QDockWidgetLayout(QWidget *parent)
    : QLayout(parent), verticalTitleBar(false), item_list(RoleCount, 0)
{
}

QDockWidgetLayout::~QDockWidgetLayout()
{
    qDeleteAll(item_list);
}

bool QDockWidgetLayout::nativeWindowDeco() const
{
    return nativeWindowDeco(parentWidget()->isWindow());
}

bool QDockWidgetLayout::nativeWindowDeco(bool floating) const
{
#if defined(Q_WS_X11) || defined(Q_WS_QWS) || defined(Q_WS_WINCE)
    Q_UNUSED(floating);
    return false;
#else
    return floating && item_list[QDockWidgetLayout::TitleBar] == 0;
#endif
}


void QDockWidgetLayout::addItem(QLayoutItem*)
{
    qWarning() << "QDockWidgetLayout::addItem(): please use QDockWidgetLayout::setWidget()";
    return;
}

QLayoutItem *QDockWidgetLayout::itemAt(int index) const
{
    int cnt = 0;
    for (int i = 0; i < item_list.count(); ++i) {
        QLayoutItem *item = item_list.at(i);
        if (item == 0)
            continue;
        if (index == cnt++)
            return item;
    }
    return 0;
}

QLayoutItem *QDockWidgetLayout::takeAt(int index)
{
    int j = 0;
    for (int i = 0; i < item_list.count(); ++i) {
        QLayoutItem *item = item_list.at(i);
        if (item == 0)
            continue;
        if (index == j) {
            item_list[i] = 0;
            invalidate();
            return item;
        }
        ++j;
    }
    return 0;
}

int QDockWidgetLayout::count() const
{
    int result = 0;
    for (int i = 0; i < item_list.count(); ++i) {
        if (item_list.at(i))
            ++result;
    }
    return result;
}

QSize QDockWidgetLayout::sizeFromContent(const QSize &content, bool floating) const
{
    QSize result = content;

    if (verticalTitleBar) {
        result.setHeight(qMax(result.height(), minimumTitleWidth()));
        result.setWidth(qMax(content.width(), 0));
    } else {
        result.setHeight(qMax(result.height(), 0));
        result.setWidth(qMax(content.width(), minimumTitleWidth()));
    }

    QDockWidget *w = qobject_cast<QDockWidget*>(parentWidget());
    const bool nativeDeco = nativeWindowDeco(floating);

    int fw = floating && !nativeDeco
            ? w->style()->pixelMetric(QStyle::PM_DockWidgetFrameWidth, 0, w)
            : 0;

    const int th = titleHeight();
    if (!nativeDeco) {
        if (verticalTitleBar)
            result += QSize(th + 2*fw, 2*fw);
        else
            result += QSize(2*fw, th + 2*fw);
    }

    result.setHeight(qMin(result.height(), (int) QWIDGETSIZE_MAX));
    result.setWidth(qMin(result.width(), (int) QWIDGETSIZE_MAX));

    if (content.width() < 0)
        result.setWidth(-1);
    if (content.height() < 0)
        result.setHeight(-1);

    int left, top, right, bottom;
    w->getContentsMargins(&left, &top, &right, &bottom);
    //we need to substract the contents margin (it will be added by the caller)
    QSize min = w->minimumSize() - QSize(left + right, top + bottom);
    QSize max = w->maximumSize() - QSize(left + right, top + bottom);

    /* A floating dockwidget will automatically get its minimumSize set to the layout's
       minimum size + deco. We're *not* interested in this, we only take minimumSize()
       into account if the user set it herself. Otherwise we end up expanding the result
       of a calculation for a non-floating dock widget to a floating dock widget's
       minimum size + window decorations. */

    uint explicitMin = 0;
    uint explicitMax = 0;
    if (w->d_func()->extra != 0) {
        explicitMin = w->d_func()->extra->explicitMinSize;
        explicitMax = w->d_func()->extra->explicitMaxSize;
    }

    if (!(explicitMin & Qt::Horizontal) || min.width() == 0)
        min.setWidth(-1);
    if (!(explicitMin & Qt::Vertical) || min.height() == 0)
        min.setHeight(-1);

    if (!(explicitMax & Qt::Horizontal))
        max.setWidth(QWIDGETSIZE_MAX);
    if (!(explicitMax & Qt::Vertical))
        max.setHeight(QWIDGETSIZE_MAX);

    return result.boundedTo(max).expandedTo(min);
}

QSize QDockWidgetLayout::sizeHint() const
{
    QDockWidget *w = qobject_cast<QDockWidget*>(parentWidget());

    QSize content(-1, -1);
    if (item_list[Content] != 0)
        content = item_list[Content]->sizeHint();

    return sizeFromContent(content, w->isFloating());
}

QSize QDockWidgetLayout::maximumSize() const
{
    if (item_list[Content] != 0) {
        const QSize content = item_list[Content]->maximumSize();
        return sizeFromContent(content, parentWidget()->isWindow());
    } else {
        return parentWidget()->maximumSize();
    }

}

QSize QDockWidgetLayout::minimumSize() const
{
    QDockWidget *w = qobject_cast<QDockWidget*>(parentWidget());

    QSize content(0, 0);
    if (item_list[Content] != 0)
        content = item_list[Content]->minimumSize();

    return sizeFromContent(content, w->isFloating());
}

QWidget *QDockWidgetLayout::widgetForRole(Role r) const
{
    QLayoutItem *item = item_list.at(r);
    return item == 0 ? 0 : item->widget();
}

QLayoutItem *QDockWidgetLayout::itemForRole(Role r) const
{
    return item_list.at(r);
}

void QDockWidgetLayout::setWidgetForRole(Role r, QWidget *w)
{
    QWidget *old = widgetForRole(r);
    if (old != 0) {
        old->hide();
        removeWidget(old);
    }

    if (w != 0) {
        addChildWidget(w);
        item_list[r] = new QWidgetItemV2(w);
        w->show();
    } else {
        item_list[r] = 0;
    }

    invalidate();
}

static inline int pick(bool vertical, const QSize &size)
{
    return vertical ? size.height() : size.width();
}

static inline int perp(bool vertical, const QSize &size)
{
    return vertical ? size.width() : size.height();
}

int QDockWidgetLayout::minimumTitleWidth() const
{
    QDockWidget *q = qobject_cast<QDockWidget*>(parentWidget());

    if (QWidget *title = widgetForRole(TitleBar))
        return pick(verticalTitleBar, title->minimumSizeHint());

    QSize closeSize(0, 0);
    QSize floatSize(0, 0);
    if (hasFeature(q, QDockWidget::DockWidgetClosable)) {
        if (QLayoutItem *item = item_list[CloseButton])
            closeSize = item->widget()->sizeHint();
    }
    if (hasFeature(q, QDockWidget::DockWidgetFloatable)) {
        if (QLayoutItem *item = item_list[FloatButton])
            floatSize = item->widget()->sizeHint();
    }

    int titleHeight = this->titleHeight();

    int mw = q->style()->pixelMetric(QStyle::PM_DockWidgetTitleMargin, 0, q);
    int fw = q->style()->pixelMetric(QStyle::PM_DockWidgetFrameWidth, 0, q);

    return pick(verticalTitleBar, closeSize)
            + pick(verticalTitleBar, floatSize)
            + titleHeight + 2*fw + 3*mw;
}

int QDockWidgetLayout::titleHeight() const
{
    QDockWidget *q = qobject_cast<QDockWidget*>(parentWidget());

    if (QWidget *title = widgetForRole(TitleBar))
        return perp(verticalTitleBar, title->sizeHint());

    QSize closeSize(0, 0);
    QSize floatSize(0, 0);
    if (QLayoutItem *item = item_list[CloseButton])
        closeSize = item->widget()->sizeHint();
    if (QLayoutItem *item = item_list[FloatButton])
        floatSize = item->widget()->sizeHint();

    int buttonHeight = qMax(perp(verticalTitleBar, closeSize),
                            perp(verticalTitleBar, floatSize));

    QFontMetrics titleFontMetrics = q->fontMetrics();
#ifdef Q_WS_MAC
    if (qobject_cast<QMacStyle *>(q->style())) {
        //### this breaks on proxy styles.  (But is this code still called?)
        QFont font = qt_app_fonts_hash()->value("QToolButton", q->font());
        titleFontMetrics = QFontMetrics(font);
    }
#endif

    int mw = q->style()->pixelMetric(QStyle::PM_DockWidgetTitleMargin, 0, q);

    return qMax(buttonHeight + 2, titleFontMetrics.lineSpacing() + 2*mw);
}

void QDockWidgetLayout::setGeometry(const QRect &geometry)
{
    QDockWidget *q = qobject_cast<QDockWidget*>(parentWidget());

    bool nativeDeco = nativeWindowDeco();

    int fw = q->isFloating() && !nativeDeco
            ? q->style()->pixelMetric(QStyle::PM_DockWidgetFrameWidth, 0, q)
            : 0;

    if (nativeDeco) {
        if (QLayoutItem *item = item_list[Content])
            item->setGeometry(geometry);
    } else {
        int titleHeight = this->titleHeight();

        if (verticalTitleBar) {
            _titleArea = QRect(QPoint(fw, fw),
                                QSize(titleHeight, geometry.height() - (fw * 2)));
        } else {
            _titleArea = QRect(QPoint(fw, fw),
                                QSize(geometry.width() - (fw * 2), titleHeight));
        }

        if (QLayoutItem *item = item_list[TitleBar]) {
            item->setGeometry(_titleArea);
        } else {
            QStyleOptionDockWidgetV2 opt;
            q->initStyleOption(&opt);

            if (QLayoutItem *item = item_list[CloseButton]) {
                if (!item->isEmpty()) {
                    QRect r = q->style()
                        ->subElementRect(QStyle::SE_DockWidgetCloseButton,
                                            &opt, q);
                    if (!r.isNull())
                        item->setGeometry(r);
                }
            }

            if (QLayoutItem *item = item_list[FloatButton]) {
                if (!item->isEmpty()) {
                    QRect r = q->style()
                        ->subElementRect(QStyle::SE_DockWidgetFloatButton,
                                            &opt, q);
                    if (!r.isNull())
                        item->setGeometry(r);
                }
            }
        }

        if (QLayoutItem *item = item_list[Content]) {
            QRect r = geometry;
            if (verticalTitleBar) {
                r.setLeft(_titleArea.right() + 1);
                r.adjust(0, fw, -fw, -fw);
            } else {
                r.setTop(_titleArea.bottom() + 1);
                r.adjust(fw, 0, -fw, -fw);
            }
            item->setGeometry(r);
        }
    }
}

void QDockWidgetLayout::setVerticalTitleBar(bool b)
{
    if (b == verticalTitleBar)
        return;
    verticalTitleBar = b;
    invalidate();
    parentWidget()->update();
}

/******************************************************************************
** QDockWidgetItem
*/

QDockWidgetItem::QDockWidgetItem(QDockWidget *dockWidget)
    : QWidgetItem(dockWidget)
{
}

QSize QDockWidgetItem::minimumSize() const
{
    QSize widgetMin(0, 0);
    if (QLayoutItem *item = dockWidgetChildItem())
        widgetMin = item->minimumSize();
    return dockWidgetLayout()->sizeFromContent(widgetMin, false);
}

QSize QDockWidgetItem::maximumSize() const
{
    if (QLayoutItem *item = dockWidgetChildItem()) {
        return dockWidgetLayout()->sizeFromContent(item->maximumSize(), false);
    } else {
        return QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
    }
}


QSize QDockWidgetItem::sizeHint() const
{
    if (QLayoutItem *item = dockWidgetChildItem()) {
         return dockWidgetLayout()->sizeFromContent(item->sizeHint(), false);
    } else {
        return QWidgetItem::sizeHint();
    }
}

/******************************************************************************
** QDockWidgetPrivate
*/

void QDockWidgetPrivate::init()
{
    Q_Q(QDockWidget);

    QDockWidgetLayout *layout = new QDockWidgetLayout(q);
    layout->setSizeConstraint(QLayout::SetMinAndMaxSize);

    QAbstractButton *button = new QDockWidgetTitleButton(q);
    button->setObjectName(QLatin1String("qt_dockwidget_floatbutton"));
    QObject::connect(button, SIGNAL(clicked()), q, SLOT(_q_toggleTopLevel()));
    layout->setWidgetForRole(QDockWidgetLayout::FloatButton, button);

    button = new QDockWidgetTitleButton(q);
    button->setObjectName(QLatin1String("qt_dockwidget_closebutton"));
    QObject::connect(button, SIGNAL(clicked()), q, SLOT(close()));
    layout->setWidgetForRole(QDockWidgetLayout::CloseButton, button);

    resizer = new QWidgetResizeHandler(q);
    resizer->setMovingEnabled(false);
    resizer->setActive(false);

#ifndef QT_NO_ACTION
    toggleViewAction = new QAction(q);
    toggleViewAction->setCheckable(true);
    fixedWindowTitle = qt_setWindowTitle_helperHelper(q->windowTitle(), q);
    toggleViewAction->setText(fixedWindowTitle);
    QObject::connect(toggleViewAction, SIGNAL(triggered(bool)),
                        q, SLOT(_q_toggleView(bool)));
#endif

    updateButtons();
}

/*!
    Initialize \a option with the values from this QDockWidget. This method
    is useful for subclasses when they need a QStyleOptionDockWidget, but don't want
    to fill in all the information themselves.

    \sa QStyleOption::initFrom()
*/
void QDockWidget::initStyleOption(QStyleOptionDockWidget *option) const
{
    Q_D(const QDockWidget);

    if (!option)
        return;
    QDockWidgetLayout *dwlayout = qobject_cast<QDockWidgetLayout*>(layout());

    option->initFrom(this);
    option->rect = dwlayout->titleArea();
    option->title = d->fixedWindowTitle;
    option->closable = hasFeature(this, QDockWidget::DockWidgetClosable);
    option->movable = hasFeature(this, QDockWidget::DockWidgetMovable);
    option->floatable = hasFeature(this, QDockWidget::DockWidgetFloatable);

    QDockWidgetLayout *l = qobject_cast<QDockWidgetLayout*>(layout());
    QStyleOptionDockWidgetV2 *v2
        = qstyleoption_cast<QStyleOptionDockWidgetV2*>(option);
    if (v2 != 0)
        v2->verticalTitleBar = l->verticalTitleBar;
}

void QDockWidgetPrivate::_q_toggleView(bool b)
{
    Q_Q(QDockWidget);
    if (b == q->isHidden()) {
        if (b)
            q->show();
        else
            q->close();
    }
}

void QDockWidgetPrivate::updateButtons()
{
    Q_Q(QDockWidget);
    QDockWidgetLayout *dwLayout = qobject_cast<QDockWidgetLayout*>(layout);

    QStyleOptionDockWidget opt;
    q->initStyleOption(&opt);

    bool customTitleBar = dwLayout->widgetForRole(QDockWidgetLayout::TitleBar) != 0;
    bool nativeDeco = dwLayout->nativeWindowDeco();
    bool hideButtons = nativeDeco || customTitleBar;

    bool canClose = hasFeature(this, QDockWidget::DockWidgetClosable);
    bool canFloat = hasFeature(this, QDockWidget::DockWidgetFloatable);

    QAbstractButton *button
        = qobject_cast<QAbstractButton*>(dwLayout->widgetForRole(QDockWidgetLayout::FloatButton));
    button->setIcon(q->style()->standardIcon(QStyle::SP_TitleBarNormalButton, &opt, q));
    button->setVisible(canFloat && !hideButtons);

    button
        = qobject_cast <QAbstractButton*>(dwLayout->widgetForRole(QDockWidgetLayout::CloseButton));
    button->setIcon(q->style()->standardIcon(QStyle::SP_TitleBarCloseButton, &opt, q));
    button->setVisible(canClose && !hideButtons);

    q->setAttribute(Qt::WA_ContentsPropagated,
                    (canFloat || canClose) && !hideButtons);

    layout->invalidate();
}

void QDockWidgetPrivate::_q_toggleTopLevel()
{
    Q_Q(QDockWidget);
    q->setFloating(!q->isFloating());
}

void QDockWidgetPrivate::initDrag(const QPoint &pos, bool nca)
{
    Q_Q(QDockWidget);

    if (state != 0)
        return;

    QMainWindow *win = qobject_cast<QMainWindow*>(parent);
    Q_ASSERT(win != 0);
    QMainWindowLayout *layout = qobject_cast<QMainWindowLayout*>(win->layout());
    Q_ASSERT(layout != 0);
    if (layout->layoutState.indexOf(q).isEmpty()) //The dock widget has not been added into the main window
        return;
    if (layout->pluggingWidget != 0) // the main window is animating a docking operation
        return;

    state = new QDockWidgetPrivate::DragState;
    state->pressPos = pos;
    state->dragging = false;
    state->widgetItem = 0;
    state->ownWidgetItem = false;
    state->nca = nca;
    state->ctrlDrag = false;
}

void QDockWidgetPrivate::startDrag()
{
    Q_Q(QDockWidget);

    if (state == 0 || state->dragging)
        return;

    QMainWindowLayout *layout
        = qobject_cast<QMainWindowLayout *>(q->parentWidget()->layout());
    Q_ASSERT(layout != 0);

    state->widgetItem = layout->unplug(q);
    if (state->widgetItem == 0) {
        /* I have a QMainWindow parent, but I was never inserted with
            QMainWindow::addDockWidget, so the QMainWindowLayout has no
            widget item for me. :( I have to create it myself, and then
            delete it if I don't get dropped into a dock area. */
        state->widgetItem = new QDockWidgetItem(q);
        state->ownWidgetItem = true;
    }

    if (state->ctrlDrag)
        layout->restore();

    state->dragging = true;
}

void QDockWidgetPrivate::endDrag(bool abort)
{
    Q_Q(QDockWidget);
    Q_ASSERT(state != 0);

    q->releaseMouse();

    if (state->dragging) {
        QMainWindowLayout *mwLayout =
            qobject_cast<QMainWindowLayout *>(q->parentWidget()->layout());
        Q_ASSERT(mwLayout != 0);

        if (abort || !mwLayout->plug(state->widgetItem)) {
            if (hasFeature(this, QDockWidget::DockWidgetFloatable)) {
                if (state->ownWidgetItem)
                    delete state->widgetItem;
                mwLayout->restore();
#ifdef Q_WS_X11
                // get rid of the X11BypassWindowManager window flag and activate the resizer
                Qt::WindowFlags flags = q->windowFlags();
                flags &= ~Qt::X11BypassWindowManagerHint;
                q->setWindowFlags(flags);
                resizer->setActive(QWidgetResizeHandler::Resize, true);
                q->show();
#else
                QDockWidgetLayout *myLayout
                    = qobject_cast<QDockWidgetLayout*>(layout);
                resizer->setActive(QWidgetResizeHandler::Resize,
                                    myLayout->widgetForRole(QDockWidgetLayout::TitleBar) != 0);
#endif
                undockedGeometry = q->geometry();
                q->activateWindow();
            } else {
                mwLayout->revert(state->widgetItem);
            }
        }
    }
    delete state;
    state = 0;
}

bool QDockWidgetPrivate::isAnimating() const
{
    Q_Q(const QDockWidget);

    QMainWindow *mainWin = qobject_cast<QMainWindow*>(parent);
    if (mainWin == 0)
        return false;

    QMainWindowLayout *mainWinLayout
        = qobject_cast<QMainWindowLayout*>(mainWin->layout());
    if (mainWinLayout == 0)
        return false;

    return (void*)mainWinLayout->pluggingWidget == (void*)q;
}

bool QDockWidgetPrivate::mousePressEvent(QMouseEvent *event)
{
#if !defined(QT_NO_MAINWINDOW)
    Q_Q(QDockWidget);

    QDockWidgetLayout *dwLayout
        = qobject_cast<QDockWidgetLayout*>(layout);

    if (!dwLayout->nativeWindowDeco()) {
        QRect titleArea = dwLayout->titleArea();

        if (event->button() != Qt::LeftButton ||
            !titleArea.contains(event->pos()) ||
            // check if the tool window is movable... do nothing if it
            // is not (but allow moving if the window is floating)
            (!hasFeature(this, QDockWidget::DockWidgetMovable) && !q->isFloating()) ||
            qobject_cast<QMainWindow*>(parent) == 0 ||
            isAnimating() || state != 0) {
            return false;
        }

        initDrag(event->pos(), false);

        if (state)
            state->ctrlDrag = hasFeature(this, QDockWidget::DockWidgetFloatable) && event->modifiers() & Qt::ControlModifier;

        return true;
    }

#endif // !defined(QT_NO_MAINWINDOW)
    return false;
}

bool QDockWidgetPrivate::mouseDoubleClickEvent(QMouseEvent *event)
{
    QDockWidgetLayout *dwLayout = qobject_cast<QDockWidgetLayout*>(layout);

    if (!dwLayout->nativeWindowDeco()) {
        QRect titleArea = dwLayout->titleArea();

        if (event->button() == Qt::LeftButton && titleArea.contains(event->pos()) &&
            hasFeature(this, QDockWidget::DockWidgetFloatable)) {
            _q_toggleTopLevel();
            return true;
        }
    }
    return false;
}

bool QDockWidgetPrivate::mouseMoveEvent(QMouseEvent *event)
{
    bool ret = false;
#if !defined(QT_NO_MAINWINDOW)
    Q_Q(QDockWidget);

    if (!state)
        return ret;

    QDockWidgetLayout *dwlayout
        = qobject_cast<QDockWidgetLayout*>(layout);
    QMainWindowLayout *mwlayout
        = qobject_cast<QMainWindowLayout*>(q->parentWidget()->layout());
    if (!dwlayout->nativeWindowDeco()) {
        if (!state->dragging
            && mwlayout->pluggingWidget == 0
            && (event->pos() - state->pressPos).manhattanLength()
                > QApplication::startDragDistance()) {
            startDrag();
#ifdef Q_OS_WIN
            grabMouseWhileInWindow();
#else
            q->grabMouse();
#endif
            ret = true;
        }
    }

    if (state->dragging && !state->nca) {
        QPoint pos = event->globalPos() - state->pressPos;
        q->move(pos);

        if (!state->ctrlDrag)
            mwlayout->hover(state->widgetItem, event->globalPos());

        ret = true;
    }

#endif // !defined(QT_NO_MAINWINDOW)
    return ret;
}

bool QDockWidgetPrivate::mouseReleaseEvent(QMouseEvent *event)
{
#if !defined(QT_NO_MAINWINDOW)

    if (event->button() == Qt::LeftButton && state && !state->nca) {
        endDrag();
        return true; //filter out the event
    }

#endif // !defined(QT_NO_MAINWINDOW)
    return false;
}

void QDockWidgetPrivate::nonClientAreaMouseEvent(QMouseEvent *event)
{
    Q_Q(QDockWidget);

    int fw = q->style()->pixelMetric(QStyle::PM_DockWidgetFrameWidth, 0, q);

    QRect geo = q->geometry();
    QRect titleRect = q->frameGeometry();
#ifdef Q_WS_MAC
    if ((features & QDockWidget::DockWidgetVerticalTitleBar)) {
        titleRect.setTop(geo.top());
        titleRect.setBottom(geo.bottom());
        titleRect.setRight(geo.left() - 1);
    } else
#endif
    {
        titleRect.setLeft(geo.left());
        titleRect.setRight(geo.right());
        titleRect.setBottom(geo.top() - 1);
        titleRect.adjust(0, fw, 0, 0);
    }

    switch (event->type()) {
        case QEvent::NonClientAreaMouseButtonPress:
            if (!titleRect.contains(event->globalPos()))
                break;
            if (state != 0)
                break;
            if (qobject_cast<QMainWindow*>(parent) == 0)
                break;
            if (isAnimating())
                break;
            initDrag(event->pos(), true);
            if (state == 0)
                break;
#ifdef Q_OS_WIN
            // On Windows, NCA mouse events don't contain modifier info
            state->ctrlDrag = GetKeyState(VK_CONTROL) & 0x8000;
#else
            state->ctrlDrag = event->modifiers() & Qt::ControlModifier;
#endif
            startDrag();
            break;
        case QEvent::NonClientAreaMouseMove:
            if (state == 0 || !state->dragging)
                break;
            if (state->nca) {
                endDrag();
            }
#ifdef Q_OS_MAC
            else { // workaround for lack of mouse-grab on Mac
                QMainWindowLayout *layout
                    = qobject_cast<QMainWindowLayout *>(q->parentWidget()->layout());
                Q_ASSERT(layout != 0);

                q->move(event->globalPos() - state->pressPos);
                if (!state->ctrlDrag)
                    layout->hover(state->widgetItem, event->globalPos());
            }
#endif
            break;
        case QEvent::NonClientAreaMouseButtonRelease:
#ifdef Q_OS_MAC
                        if (state)
                                endDrag();
#endif
                        break;
        case QEvent::NonClientAreaMouseButtonDblClick:
            _q_toggleTopLevel();
            break;
        default:
            break;
    }
}

void QDockWidgetPrivate::moveEvent(QMoveEvent *event)
{
    Q_Q(QDockWidget);

    if (state == 0 || !state->dragging || !state->nca || !q->isWindow())
        return;

    // When the native window frame is being dragged, all we get is these mouse
    // move events.

    if (state->ctrlDrag)
        return;

    QMainWindowLayout *layout
        = qobject_cast<QMainWindowLayout *>(q->parentWidget()->layout());
    Q_ASSERT(layout != 0);

    QPoint globalMousePos = event->pos() + state->pressPos;
    layout->hover(state->widgetItem, globalMousePos);
}

void QDockWidgetPrivate::unplug(const QRect &rect)
{
    Q_Q(QDockWidget);
    QRect r = rect;
    r.moveTopLeft(q->mapToGlobal(QPoint(0, 0)));
    QDockWidgetLayout *dwLayout = qobject_cast<QDockWidgetLayout*>(layout);
    if (dwLayout->nativeWindowDeco(true))
        r.adjust(0, dwLayout->titleHeight(), 0, 0);
    setWindowState(true, true, r);
}

void QDockWidgetPrivate::plug(const QRect &rect)
{
    setWindowState(false, false, rect);
}

void QDockWidgetPrivate::setWindowState(bool floating, bool unplug, const QRect &rect)
{
    Q_Q(QDockWidget);

    bool wasFloating = q->isFloating();
    bool hidden = q->isHidden();

    if (q->isVisible())
        q->hide();

    Qt::WindowFlags flags = floating ? Qt::Tool : Qt::Widget;

    QDockWidgetLayout *dwLayout = qobject_cast<QDockWidgetLayout*>(layout);
    const bool nativeDeco = dwLayout->nativeWindowDeco(floating);

    if (nativeDeco) {
        flags |= Qt::CustomizeWindowHint | Qt::WindowTitleHint;
        if (hasFeature(this, QDockWidget::DockWidgetClosable))
            flags |= Qt::WindowCloseButtonHint;
    } else {
        flags |= Qt::FramelessWindowHint;
    }

    if (unplug)
        flags |= Qt::X11BypassWindowManagerHint;

    q->setWindowFlags(flags);

#if defined(Q_WS_MAC) && !defined(QT_MAC_USE_COCOA)
    if (floating && nativeDeco && (q->features() & QDockWidget::DockWidgetVerticalTitleBar)) {
        ChangeWindowAttributes(HIViewGetWindow(HIViewRef(q->winId())), kWindowSideTitlebarAttribute, 0);
    }
#endif

    if (!rect.isNull())
        q->setGeometry(rect);

    updateButtons();

    if (!hidden)
        q->show();

    if (floating != wasFloating) {
        emit q->topLevelChanged(floating);
        if (!floating && parent) {
            QMainWindowLayout *mwlayout = qobject_cast<QMainWindowLayout *>(q->parentWidget()->layout());
            if (mwlayout)
                emit q->dockLocationChanged(mwlayout->dockWidgetArea(q));
        }
    }

    resizer->setActive(QWidgetResizeHandler::Resize, !unplug && floating && !nativeDeco);
}

/*!
    \class QDockWidget

    \brief The QDockWidget class provides a widget that can be docked
    inside a QMainWindow or floated as a top-level window on the
    desktop.

    \ingroup mainwindow-classes

    QDockWidget provides the concept of dock widgets, also know as
    tool palettes or utility windows.  Dock windows are secondary
    windows placed in the \e {dock widget area} around the
    \l{QMainWindow::centralWidget()}{central widget} in a
    QMainWindow.

    \image mainwindow-docks.png

    Dock windows can be moved inside their current area, moved into
    new areas and floated (e.g., undocked) by the end-user.  The
    QDockWidget API allows the programmer to restrict the dock widgets
    ability to move, float and close, as well as the areas in which
    they can be placed.

    \section1 Appearance

    A QDockWidget consists of a title bar and the content area.  The
    title bar displays the dock widgets \link QWidget::windowTitle()
    window title\endlink, a \e float button and a \e close button.
    Depending on the state of the QDockWidget, the \e float and \e
    close buttons may be either disabled or not shown at all.

    The visual appearance of the title bar and buttons is dependent
    on the \l{QStyle}{style} in use.

    A QDockWidget acts as a wrapper for its child widget, set with setWidget().
    Custom size hints, minimum and maximum sizes and size policies should be
    implemented in the child widget. QDockWidget will respect them, adjusting
    its own constraints to include the frame and title. Size constraints
    should not be set on the QDockWidget itself, because they change depending
    on whether it is docked; a docked QDockWidget has no frame and a smaller title
    bar.

    \sa QMainWindow, {Dock Widgets Example}
*/

/*!
    \enum QDockWidget::DockWidgetFeature

    \value DockWidgetClosable   The dock widget can be closed. On some systems the dock
	                            widget always has a close button when it's floating
								(for example on MacOS 10.5).
    \value DockWidgetMovable    The dock widget can be moved between docks
                                by the user.
    \value DockWidgetFloatable  The dock widget can be detached from the
                                main window, and floated as an independent
                                window.
    \value DockWidgetVerticalTitleBar The dock widget displays a vertical title
                                  bar on its left side. This can be used to
                                  increase the amount of vertical space in
                                  a QMainWindow.
    \value AllDockWidgetFeatures  (Deprecated) The dock widget can be closed, moved,
                                  and floated. Since new features might be added in future
                                  releases, the look and behavior of dock widgets might
                                  change if you use this flag. Please specify individual
                                  flags instead.
    \value NoDockWidgetFeatures   The dock widget cannot be closed, moved,
                                  or floated.

    \omitvalue DockWidgetFeatureMask
    \omitvalue Reserved
*/

/*!
    \property QDockWidget::windowTitle
    \internal

    By default, this property contains an empty string.
*/

/*!
    Constructs a QDockWidget with parent \a parent and window flags \a
    flags. The dock widget will be placed in the left dock widget
    area.
*/
QDockWidget::QDockWidget(QWidget *parent, Qt::WindowFlags flags)
    : QWidget(*new QDockWidgetPrivate, parent, flags)
{
    Q_D(QDockWidget);
    d->init();
}

/*!
    Constructs a QDockWidget with parent \a parent and window flags \a
    flags. The dock widget will be placed in the left dock widget
    area.

    The window title is set to \a title. This title is used when the
    QDockWidget is docked and undocked. It is also used in the context
    menu provided by QMainWindow.

    \sa setWindowTitle()
*/
QDockWidget::QDockWidget(const QString &title, QWidget *parent, Qt::WindowFlags flags)
    : QWidget(*new QDockWidgetPrivate, parent, flags)
{
    Q_D(QDockWidget);
    d->init();
    setWindowTitle(title);
}

/*!
    Destroys the dock widget.
*/
QDockWidget::~QDockWidget()
{ }

/*!
    Returns the widget for the dock widget. This function returns zero
    if the widget has not been set.

    \sa setWidget()
*/
QWidget *QDockWidget::widget() const
{
    QDockWidgetLayout *layout = qobject_cast<QDockWidgetLayout*>(this->layout());
    return layout->widgetForRole(QDockWidgetLayout::Content);
}

/*!
    Sets the widget for the dock widget to \a widget.

    If the dock widget is visible when \a widget is added, you must
    \l{QWidget::}{show()} it explicitly.

    Note that you must add the layout of the \a widget before you call
    this function; if not, the \a widget will not be visible.

    \sa widget()
*/
void QDockWidget::setWidget(QWidget *widget)
{
    QDockWidgetLayout *layout = qobject_cast<QDockWidgetLayout*>(this->layout());
    layout->setWidgetForRole(QDockWidgetLayout::Content, widget);
}

/*!
    \property QDockWidget::features
    \brief whether the dock widget is movable, closable, and floatable

    By default, this property is set to a combination of DockWidgetClosable,
    DockWidgetMovable and DockWidgetFloatable.

    \sa DockWidgetFeature
*/

void QDockWidget::setFeatures(QDockWidget::DockWidgetFeatures features)
{
    Q_D(QDockWidget);
    features &= DockWidgetFeatureMask;
    if (d->features == features)
        return;
    d->features = features;
    QDockWidgetLayout *layout
        = qobject_cast<QDockWidgetLayout*>(this->layout());
    layout->setVerticalTitleBar(features & DockWidgetVerticalTitleBar);
    d->updateButtons();
    d->toggleViewAction->setEnabled((d->features & DockWidgetClosable) == DockWidgetClosable);
    emit featuresChanged(d->features);
    update();
}

QDockWidget::DockWidgetFeatures QDockWidget::features() const
{
    Q_D(const QDockWidget);
    return d->features;
}

/*!
    \property QDockWidget::floating
    \brief whether the dock widget is floating

    A floating dock widget is presented to the user as an independent
    window "on top" of its parent QMainWindow, instead of being
    docked in the QMainWindow.

    By default, this property is true.

    \sa isWindow()
*/
void QDockWidget::setFloating(bool floating)
{
    Q_D(QDockWidget);

    // the initial click of a double-click may have started a drag...
    if (d->state != 0)
        d->endDrag(true);

    QRect r = d->undockedGeometry;

    d->setWindowState(floating, false, floating ? r : QRect());
    if (floating && r.isNull()) {
        QDockWidgetLayout *layout = qobject_cast<QDockWidgetLayout*>(this->layout());
        QRect titleArea = layout->titleArea();
        int h = layout->verticalTitleBar ? titleArea.width() : titleArea.height();
        QPoint p = mapToGlobal(QPoint(h, h));
        move(p);
    }
}

/*!
    \property QDockWidget::allowedAreas
    \brief areas where the dock widget may be placed

    The default is Qt::AllDockWidgetAreas.

    \sa Qt::DockWidgetArea
*/

void QDockWidget::setAllowedAreas(Qt::DockWidgetAreas areas)
{
    Q_D(QDockWidget);
    areas &= Qt::DockWidgetArea_Mask;
    if (areas == d->allowedAreas)
        return;
    d->allowedAreas = areas;
    emit allowedAreasChanged(d->allowedAreas);
}

Qt::DockWidgetAreas QDockWidget::allowedAreas() const
{
    Q_D(const QDockWidget);
    return d->allowedAreas;
}

/*!
    \fn bool QDockWidget::isAreaAllowed(Qt::DockWidgetArea area) const

    Returns true if this dock widget can be placed in the given \a area;
    otherwise returns false.
*/

/*! \reimp */
void QDockWidget::changeEvent(QEvent *event)
{
    Q_D(QDockWidget);
    QDockWidgetLayout *layout = qobject_cast<QDockWidgetLayout*>(this->layout());

    switch (event->type()) {
    case QEvent::ModifiedChange:
    case QEvent::WindowTitleChange:
        update(layout->titleArea());
#ifndef QT_NO_ACTION
        d->fixedWindowTitle = qt_setWindowTitle_helperHelper(windowTitle(), this);
        d->toggleViewAction->setText(d->fixedWindowTitle);
#endif
#ifndef QT_NO_TABBAR
        {
            QMainWindow *win = qobject_cast<QMainWindow*>(parentWidget());
            if (QMainWindowLayout *winLayout =
                (win ? qobject_cast<QMainWindowLayout*>(win->layout()) : 0))
                if (QDockAreaLayoutInfo *info = winLayout->layoutState.dockAreaLayout.info(this))
                    info->updateTabBar();
        }
#endif // QT_NO_TABBAR
        break;
    default:
        break;
    }
    QWidget::changeEvent(event);
}

/*! \reimp */
void QDockWidget::closeEvent(QCloseEvent *event)
{
    Q_D(QDockWidget);
    if (d->state)
        d->endDrag(true);
    QWidget::closeEvent(event);
}

/*! \reimp */
void QDockWidget::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event)

    QDockWidgetLayout *layout
        = qobject_cast<QDockWidgetLayout*>(this->layout());
    bool customTitleBar = layout->widgetForRole(QDockWidgetLayout::TitleBar) != 0;
    bool nativeDeco = layout->nativeWindowDeco();

    if (!nativeDeco && !customTitleBar) {
        QStylePainter p(this);
        // ### Add PixelMetric to change spacers, so style may show border
        // when not floating.
        if (isFloating()) {
            QStyleOptionFrame framOpt;
            framOpt.init(this);
            p.drawPrimitive(QStyle::PE_FrameDockWidget, framOpt);
        }

        // Title must be painted after the frame, since the areas overlap, and
        // the title may wish to extend out to all sides (eg. XP style)
        QStyleOptionDockWidgetV2 titleOpt;
        initStyleOption(&titleOpt);
        p.drawControl(QStyle::CE_DockWidgetTitle, titleOpt);
    }
}

/*! \reimp */
bool QDockWidget::event(QEvent *event)
{
    Q_D(QDockWidget);

    QMainWindow *win = qobject_cast<QMainWindow*>(parentWidget());
    QMainWindowLayout *layout = 0;
    if (win != 0)
        layout = qobject_cast<QMainWindowLayout*>(win->layout());

    switch (event->type()) {
#ifndef QT_NO_ACTION
    case QEvent::Hide:
        if (layout != 0)
            layout->keepSize(this);
        d->toggleViewAction->setChecked(false);
        emit visibilityChanged(false);
        break;
    case QEvent::Show:
        d->toggleViewAction->setChecked(true);
        emit visibilityChanged(geometry().right() >= 0 && geometry().bottom() >= 0);
        break;
#endif
    case QEvent::ApplicationLayoutDirectionChange:
    case QEvent::LayoutDirectionChange:
    case QEvent::StyleChange:
    case QEvent::ParentChange:
        d->updateButtons();
        break;
    case QEvent::ZOrderChange: {
        bool onTop = false;
        if (win != 0) {
            const QObjectList &siblings = win->children();
            onTop = siblings.count() > 0 && siblings.last() == (QObject*)this;
        }
        if (!isFloating() && layout != 0 && onTop)
            layout->raise(this);
        break;
    }
    case QEvent::WindowActivate:
    case QEvent::WindowDeactivate:
        update(qobject_cast<QDockWidgetLayout *>(this->layout())->titleArea());
        break;
    case QEvent::ContextMenu:
        if (d->state) {
            event->accept();
            return true;
        }
        break;
        // return true after calling the handler since we don't want
        // them to be passed onto the default handlers
    case QEvent::MouseButtonPress:
        if (d->mousePressEvent(static_cast<QMouseEvent *>(event)))
            return true;
        break;
    case QEvent::MouseButtonDblClick:
        if (d->mouseDoubleClickEvent(static_cast<QMouseEvent *>(event)))
            return true;
        break;
    case QEvent::MouseMove:
        if (d->mouseMoveEvent(static_cast<QMouseEvent *>(event)))
            return true;
        break;
#ifdef Q_OS_WIN
    case QEvent::Leave:
        if (d->state != 0 && d->state->dragging && !d->state->nca) {
            // This is a workaround for loosing the mouse on Vista.
            QPoint pos = QCursor::pos();
            QMouseEvent fake(QEvent::MouseMove, mapFromGlobal(pos), pos, Qt::NoButton,
                             QApplication::mouseButtons(), QApplication::keyboardModifiers());
            d->mouseMoveEvent(&fake);
        }
        break;
#endif
    case QEvent::MouseButtonRelease:
        if (d->mouseReleaseEvent(static_cast<QMouseEvent *>(event)))
            return true;
        break;
    case QEvent::NonClientAreaMouseMove:
    case QEvent::NonClientAreaMouseButtonPress:
    case QEvent::NonClientAreaMouseButtonRelease:
    case QEvent::NonClientAreaMouseButtonDblClick:
        d->nonClientAreaMouseEvent(static_cast<QMouseEvent*>(event));
        return true;
    case QEvent::Move:
        d->moveEvent(static_cast<QMoveEvent*>(event));
        break;
    case QEvent::Resize:
        // if the mainwindow is plugging us, we don't want to update undocked geometry
        if (isFloating() && layout != 0 && layout->pluggingWidget != this)
            d->undockedGeometry = geometry();
        break;
    default:
        break;
    }
    return QWidget::event(event);
}

#ifndef QT_NO_ACTION
/*!
  Returns a checkable action that can be used to show or close this
  dock widget.

  The action's text is set to the dock widget's window title.

  \sa QAction::text QWidget::windowTitle
 */
QAction * QDockWidget::toggleViewAction() const
{
    Q_D(const QDockWidget);
    return d->toggleViewAction;
}
#endif // QT_NO_ACTION

/*!
    \fn void QDockWidget::featuresChanged(QDockWidget::DockWidgetFeatures features)

    This signal is emitted when the \l features property changes. The
    \a features parameter gives the new value of the property.
*/

/*!
    \fn void QDockWidget::topLevelChanged(bool topLevel)

    This signal is emitted when the \l floating property changes.
    The \a topLevel parameter is true if the dock widget is now floating;
    otherwise it is false.

    \sa isWindow()
*/

/*!
    \fn void QDockWidget::allowedAreasChanged(Qt::DockWidgetAreas allowedAreas)

    This signal is emitted when the \l allowedAreas property changes. The
    \a allowedAreas parameter gives the new value of the property.
*/

/*!
    \fn void QDockWidget::visibilityChanged(bool visible)
    \since 4.3

    This signal is emitted when the dock widget becomes \a visible (or
    invisible). This happens when the widget is hidden or shown, as
    well as when it is docked in a tabbed dock area and its tab
    becomes selected or unselected.
*/

/*!
    \fn void QDockWidget::dockLocationChanged(Qt::DockWidgetArea area)
    \since 4.3

    This signal is emitted when the dock widget is moved to another
    dock \a area, or is moved to a different location in its current
    dock area. This happens when the dock widget is moved
    programmatically or is dragged to a new location by the user.
*/

/*!
    \since 4.3
    Sets an arbitrary \a widget as the dock widget's title bar. If \a widget
    is 0, the title bar widget is removed, but not deleted.

    If a title bar widget is set, QDockWidget will not use native window
    decorations when it is floated.

    Here are some tips for implementing custom title bars:

    \list
    \i Mouse events that are not explicitly handled by the title bar widget
       must be ignored by calling QMouseEvent::ignore(). These events then
       propagate to the QDockWidget parent, which handles them in the usual
       manner, moving when the title bar is dragged, docking and undocking
       when it is double-clicked, etc.

    \i When DockWidgetVerticalTitleBar is set on QDockWidget, the title
       bar widget is repositioned accordingly. In resizeEvent(), the title
       bar should check what orientation it should assume:
       \snippet doc/src/snippets/code/src_gui_widgets_qdockwidget.cpp 0

    \i The title bar widget must have a valid QWidget::sizeHint() and
       QWidget::minimumSizeHint(). These functions should take into account
       the current orientation of the title bar.
    \endlist

    Using qobject_cast as shown above, the title bar widget has full access
    to its parent QDockWidget. Hence it can perform such operations as docking
    and hiding in response to user actions.

    \sa titleBarWidget() DockWidgetVerticalTitleBar
*/

void QDockWidget::setTitleBarWidget(QWidget *widget)
{
    Q_D(QDockWidget);
    QDockWidgetLayout *layout
        = qobject_cast<QDockWidgetLayout*>(this->layout());
    layout->setWidgetForRole(QDockWidgetLayout::TitleBar, widget);
    d->updateButtons();
    if (isWindow()) {
        //this ensures the native decoration is drawn
        d->setWindowState(true /*floating*/, true /*unplug*/);
    }
}

/*!
    \since 4.3
    Returns the custom title bar widget set on the QDockWidget, or 0 if no
    custom title bar has been set.

    \sa setTitleBarWidget()
*/

QWidget *QDockWidget::titleBarWidget() const
{
    QDockWidgetLayout *layout
        = qobject_cast<QDockWidgetLayout*>(this->layout());
    return layout->widgetForRole(QDockWidgetLayout::TitleBar);
}

QT_END_NAMESPACE

#include "qdockwidget.moc"
#include "moc_qdockwidget.cpp"

#endif // QT_NO_DOCKWIDGET