summaryrefslogtreecommitdiffstats
path: root/src/gui/graphicsview/qgraphicswidget.cpp
blob: 2e7d82abbd4e59af655dafaa924e8cc50bcb3d08 (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
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qglobal.h"

#ifndef QT_NO_GRAPHICSVIEW

#include "qgraphicswidget.h"
#include "qgraphicswidget_p.h"
#include "qgraphicslayout.h"
#include "qgraphicslayout_p.h"
#include "qgraphicsscene.h"
#include "qgraphicssceneevent.h"

#ifndef QT_NO_ACTION
#include <private/qaction_p.h>
#endif
#include <private/qapplication_p.h>
#include <private/qgraphicsscene_p.h>
#ifndef QT_NO_SHORTCUT
#include <private/qshortcutmap_p.h>
#endif
#include <QtCore/qmutex.h>
#include <QtGui/qapplication.h>
#include <QtGui/qgraphicsview.h>
#include <QtGui/qgraphicsproxywidget.h>
#include <QtGui/qpalette.h>
#include <QtGui/qstyleoption.h>

#include <qdebug.h>

QT_BEGIN_NAMESPACE

/*!
    \class QGraphicsWidget
    \brief The QGraphicsWidget class is the base class for all widget
    items in a QGraphicsScene.
    \since 4.4
    \ingroup multimedia
    \ingroup graphicsview-api

    QGraphicsWidget is an extended base item that provides extra functionality
    over QGraphicsItem. It is similar to QWidget in many ways:

    \list
        \o Provides a \l palette, a \l font and a \l style().
        \o Has a defined geometry().
        \o Supports layouts with setLayout() and layout().
        \o Supports shortcuts and actions with grabShortcut() and insertAction()
    \endlist

    Unlike QGraphicsItem, QGraphicsWidget is not an abstract class; you can
    create instances of a QGraphicsWidget without having to subclass it.
    This approach is useful for widgets that only serve the purpose of
    organizing child widgets into a layout.

    QGraphicsWidget can be used as a base item for your own custom item if
    you require advanced input focus handling, e.g., tab focus and activation, or
    layouts.

    Since QGraphicsWidget resembles QWidget and has similar API, it is
    easier to port a widget from QWidget to QGraphicsWidget, instead of
    QGraphicsItem.

    \note QWidget-based widgets can be directly embedded into a
    QGraphicsScene using QGraphicsProxyWidget.

    Noticeable differences between QGraphicsWidget and QWidget are:

    \table
    \header \o QGraphicsWidget
                \o QWidget
    \row      \o Coordinates and geometry are defined with qreals (doubles or
                    floats, depending on the platform).
                \o QWidget uses integer geometry (QPoint, QRect).
    \row      \o The widget is already visible by default; you do not have to
                    call show() to display the widget.
                \o QWidget is hidden by default until you call show().
    \row      \o A subset of widget attributes are supported.
                \o All widget attributes are supported.
    \row      \o A top-level item's style defaults to QGraphicsScene::style
                \o A top-level widget's style defaults to QApplication::style
    \row      \o Graphics View provides a custom drag and drop framework, different
                    from QWidget.
                \o Standard drag and drop framework.
    \row      \o Widget items do not support modality.
                \o Full modality support.
    \endtable

    QGraphicsWidget supports a subset of Qt's widget attributes,
    (Qt::WidgetAttribute), as shown in the table below. Any attributes not
    listed in this table are unsupported, or otherwise unused.

    \table
    \header \o Widget Attribute                         \o Usage
    \row    \o Qt::WA_SetLayoutDirection
                    \o Set by setLayoutDirection(), cleared by
                        unsetLayoutDirection(). You can test this attribute to
                        check if the widget has been explicitly assigned a
                        \l{QGraphicsWidget::layoutDirection()}
                        {layoutDirection}. If the attribute is not set, the
                        \l{QGraphicsWidget::layoutDirection()}
                        {layoutDirection()} is inherited.
    \row    \o Qt::WA_RightToLeft
                    \o Toggled by setLayoutDirection(). Inherited from the
                        parent/scene. If set, the widget's layout will order
                        horizontally arranged widgets from right to left.
    \row    \o Qt::WA_SetStyle
                    \o Set and cleared by setStyle(). If this attribute is
                        set, the widget has been explicitly assigned a style.
                        If it is unset, the widget will use the scene's or the
                        application's style.
    \row    \o Qt::WA_Resized
                    \o Set by setGeometry() and resize().
    \row    \o Qt::WA_SetPalette
                    \o Set by setPalette().
    \row    \o Qt::WA_SetFont
                    \o Set by setPalette().
    \row    \o Qt::WA_WindowPropagation
                    \o Enables propagation to window widgets.
    \endtable

    Although QGraphicsWidget inherits from both QObject and QGraphicsItem,
    you should use the functions provided by QGraphicsItem, \e not QObject, to
    manage the relationships between parent and child items. These functions
    control the stacking order of items as well as their ownership.

    \note The QObject::parent() should always return 0 for QGraphicsWidgets,
    but this policy is not strictly defined.

    \sa QGraphicsProxyWidget, QGraphicsItem, {Widgets and Layouts}
*/

/*!
    \property QGraphicsWidget::enabled
    \brief whether the item is enabled or not

    This property is declared in QGraphicsItem.

    By default, this property is true.

    \sa QGraphicsItem::isEnabled(), QGraphicsItem::setEnabled()
*/

/*!
    \property QGraphicsWidget::visible
    \brief whether the item is visible or not

    This property is declared in QGraphicsItem.

    By default, this property is true.

    \sa QGraphicsItem::isVisible(), QGraphicsItem::setVisible(), show(),
    hide()
*/

/*!
    \property QGraphicsWidget::opacity
    \brief the opacity of the widget
*/    

/*!
    \property QGraphicsWidget::pos
    \brief the position of the widget
*/    

/*!
    Constructs a QGraphicsWidget instance. The optional \a parent argument is
    passed to QGraphicsItem's constructor. The optional \a wFlags argument
    specifies the widget's window flags (e.g., whether the widget should be a
    window, a tool, a popup, etc).
*/
QGraphicsWidget::QGraphicsWidget(QGraphicsItem *parent, Qt::WindowFlags wFlags)
    : QGraphicsItem(*new QGraphicsWidgetPrivate, 0, 0), QGraphicsLayoutItem(0, false)
{
    Q_D(QGraphicsWidget);
    d->init(parent, wFlags);
}

/*!
    \internal

    Constructs a new QGraphicsWidget, using \a dd as parent.
*/
QGraphicsWidget::QGraphicsWidget(QGraphicsWidgetPrivate &dd, QGraphicsItem *parent, QGraphicsScene *scene, Qt::WindowFlags wFlags)
    : QGraphicsItem(dd, 0, scene), QGraphicsLayoutItem(0, false)
{
    Q_D(QGraphicsWidget);
    d->init(parent, wFlags);
}

/*
    \internal
    \class QGraphicsWidgetStyles

    We use this thread-safe class to maintain a hash of styles for widgets
    styles. Note that QApplication::style() itself isn't thread-safe, QStyle
    isn't thread-safe, and we don't have a thread-safe factory for creating
    the default style, nor cloning a style.
*/
class QGraphicsWidgetStyles
{
public:
    QStyle *styleForWidget(const QGraphicsWidget *widget) const
    {
        QMutexLocker locker(&mutex);
        return styles.value(widget, 0);
    }

    void setStyleForWidget(QGraphicsWidget *widget, QStyle *style)
    {
        QMutexLocker locker(&mutex);
        if (style)
            styles[widget] = style;
        else
            styles.remove(widget);
    }

private:
    QMap<const QGraphicsWidget *, QStyle *> styles;
    mutable QMutex mutex;
};
Q_GLOBAL_STATIC(QGraphicsWidgetStyles, widgetStyles)

/*!
    Destroys the QGraphicsWidget instance.
*/
QGraphicsWidget::~QGraphicsWidget()
{
    Q_D(QGraphicsWidget);
#ifndef QT_NO_ACTION
    // Remove all actions from this widget
    for (int i = 0; i < d->actions.size(); ++i) {
        QActionPrivate *apriv = d->actions.at(i)->d_func();
        apriv->graphicsWidgets.removeAll(this);
    }
    d->actions.clear();
#endif

    if (QGraphicsScene *scn = scene()) {
        QGraphicsScenePrivate *sceneD = scn->d_func();
        if (sceneD->tabFocusFirst == this)
            sceneD->tabFocusFirst = (d->focusNext == this ? 0 : d->focusNext);
    }
    d->focusPrev->d_func()->focusNext = d->focusNext;
    d->focusNext->d_func()->focusPrev = d->focusPrev;

    // Play it really safe
    d->focusNext = this;
    d->focusPrev = this;

    clearFocus();

    //we check if we have a layout previously
    if (d->layout) {
        delete d->layout;
        foreach (QGraphicsItem * item, childItems()) {
            // In case of a custom layout which doesn't remove and delete items, we ensure that
            // the parent layout item does not point to the deleted layout. This code is here to
            // avoid regression from 4.4 to 4.5, because according to 4.5 docs it is not really needed.
            if (item->isWidget()) {
                QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
                if (widget->parentLayoutItem() == d->layout)
                    widget->setParentLayoutItem(0);
            }
        }
    }

    // Remove this graphics widget from widgetStyles
    widgetStyles()->setStyleForWidget(this, 0);
}

/*!
    \property QGraphicsWidget::size
    \brief the size of the widget

    Calling resize() resizes the widget to a \a size bounded by minimumSize()
    and maximumSize(). This property only affects the widget's width and
    height (e.g., its right and bottom edges); the widget's position and
    top-left corner remains unaffected.

    Resizing a widget triggers the widget to immediately receive a
    \l{QEvent::GraphicsSceneResize}{GraphicsSceneResize} event with the
    widget's old and new size.  If the widget has a layout assigned when this
    event arrives, the layout will be activated and it will automatically
    update any child widgets's geometry.

    This property does not affect any layout of the parent widget. If the
    widget itself is managed by a parent layout; e.g., it has a parent widget
    with a layout assigned, that layout will not activate.

    By default, this property contains a size with zero width and height.

    \sa setGeometry(), QGraphicsSceneResizeEvent, QGraphicsLayout
*/
QSizeF QGraphicsWidget::size() const
{
    return QGraphicsLayoutItem::geometry().size();
}

void QGraphicsWidget::resize(const QSizeF &size)
{
    setGeometry(QRectF(pos(), size));
}

/*!
    \fn void QGraphicsWidget::resize(qreal w, qreal h)

    This convenience function is equivalent to calling resize(QSizeF(w, h)).

    \sa setGeometry(), setTransform()
*/

/*!
    \property QGraphicsWidget::geometry
    \brief the geometry of the widget

    Sets the item's geometry to \a rect. The item's position and size are
    modified as a result of calling this function. The item is first moved,
    then resized.

    A side effect of calling this function is that the widget will receive
    a move event and a resize event. Also, if the widget has a layout
    assigned, the layout will activate.
    
    \sa geometry(), resize()
*/
void QGraphicsWidget::setGeometry(const QRectF &rect)
{
    QGraphicsWidgetPrivate *wd = QGraphicsWidget::d_func();
    QGraphicsLayoutItemPrivate *d = QGraphicsLayoutItem::d_ptr;
    QRectF newGeom;
    QPointF oldPos = d->geom.topLeft();
    if (!wd->inSetPos) {
        setAttribute(Qt::WA_Resized);
        newGeom = rect;
        newGeom.setSize(rect.size().expandedTo(effectiveSizeHint(Qt::MinimumSize))
                                   .boundedTo(effectiveSizeHint(Qt::MaximumSize)));
        if (newGeom == d->geom)
            return;

        // setPos triggers ItemPositionChange, which can adjust position
        wd->inSetGeometry = 1;
        wd->setPosHelper(newGeom.topLeft());
        wd->inSetGeometry = 0;
        newGeom.moveTopLeft(pos());

        if (newGeom == d->geom)
           return;

         // Update and prepare to change the geometry (remove from index) if the size has changed.
        if (wd->scene) {
            if (rect.topLeft() == d->geom.topLeft()) {
                prepareGeometryChange();
            }
        }
    }

    // Update the layout item geometry
    bool moved = oldPos != pos();
    if (moved) {
        // Send move event.
        QGraphicsSceneMoveEvent event;
        event.setOldPos(oldPos);
        event.setNewPos(pos());
        QApplication::sendEvent(this, &event);
        if (wd->inSetPos) {
            //set the new pos
            d->geom.moveTopLeft(pos());
            return;
        }
    }
    QSizeF oldSize = size();
    QGraphicsLayoutItem::setGeometry(newGeom);

    // Send resize event
    bool resized = newGeom.size() != oldSize;
    if (resized) {
        QGraphicsSceneResizeEvent re;
        re.setOldSize(oldSize);
        re.setNewSize(newGeom.size());
        QApplication::sendEvent(this, &re);
    }
}

/*!
    \fn QRectF QGraphicsWidget::rect() const

    Returns the item's local rect as a QRectF. This function is equivalent
    to QRectF(QPointF(), size()).

    \sa setGeometry(), resize()
*/

/*!
    \fn void QGraphicsWidget::setGeometry(qreal x, qreal y, qreal w, qreal h)

    This convenience function is equivalent to calling setGeometry(QRectF(
    \a x, \a y, \a w, \a h)).

    \sa geometry(), resize()
*/

/*!
    Sets the widget's contents margins to \a left, \a top, \a right and \a
    bottom.

    Contents margins are used by the assigned layout to define the placement
    of subwidgets and layouts. Margins are particularily useful for widgets
    that constrain subwidgets to only a section of its own geometry. For
    example, a group box with a layout will place subwidgets inside its frame,
    but below the title.

    Changing a widget's contents margins will always trigger an update(), and
    any assigned layout will be activated automatically. The widget will then
    receive a \l{QEvent::ContentsRectChange}{ContentsRectChange} event.

    \sa getContentsMargins(), setGeometry()
*/
void QGraphicsWidget::setContentsMargins(qreal left, qreal top, qreal right, qreal bottom)
{
    Q_D(QGraphicsWidget);

    if (left == d->leftMargin
        && top == d->topMargin
        && right == d->rightMargin
        && bottom == d->bottomMargin) {
        return;
    }

    d->leftMargin = left;
    d->topMargin = top;
    d->rightMargin = right;
    d->bottomMargin = bottom;

    if (QGraphicsLayout *l = d->layout)
        l->invalidate();
    else
        updateGeometry();

    QEvent e(QEvent::ContentsRectChange);
    QApplication::sendEvent(this, &e);
}

/*!
    Gets the widget's contents margins. The margins are stored in \a left, \a
    top, \a right and \a bottom, as pointers to qreals. Each argument can
    be \e {omitted} by passing 0.

    \sa setContentsMargins()
*/
void QGraphicsWidget::getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const
{
    Q_D(const QGraphicsWidget);
    if (left)
        *left = d->leftMargin;
    if (top)
        *top = d->topMargin;
    if (right)
        *right = d->rightMargin;
    if (bottom)
        *bottom = d->bottomMargin;
}

/*!
    Sets the widget's window frame margins to \a left, \a top, \a right and
    \a bottom. The default frame margins are provided by the style, and they
    depend on the current window flags.

    If you would like to draw your own window decoration, you can set your
    own frame margins to override the default margins.

    \sa unsetWindowFrameMargins(), getWindowFrameMargins(), windowFrameRect()
*/
void QGraphicsWidget::setWindowFrameMargins(qreal left, qreal top, qreal right, qreal bottom)
{
    Q_D(QGraphicsWidget);
    bool unchanged = left == d->leftWindowFrameMargin && top == d->topWindowFrameMargin
                     && right == d->rightWindowFrameMargin && bottom == d->bottomWindowFrameMargin;
    if (d->setWindowFrameMargins && unchanged)
        return;
    if (!unchanged)
        prepareGeometryChange();
    d->leftWindowFrameMargin = left;
    d->topWindowFrameMargin = top;
    d->rightWindowFrameMargin = right;
    d->bottomWindowFrameMargin = bottom;
    d->setWindowFrameMargins = true;
}

/*!
    Gets the widget's window frame margins. The margins are stored in \a left,
    \a top, \a right and \a bottom as pointers to qreals. Each argument can
    be \e {omitted} by passing 0.

    \sa setWindowFrameMargins(), windowFrameRect()
*/
void QGraphicsWidget::getWindowFrameMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const
{
    Q_D(const QGraphicsWidget);
    if (left)
        *left = d->leftWindowFrameMargin;
    if (top)
        *top = d->topWindowFrameMargin;
    if (right)
        *right = d->rightWindowFrameMargin;
    if (bottom)
        *bottom = d->bottomWindowFrameMargin;
}

/*!
    Resets the window frame margins to the default value, provided by the style.

    \sa setWindowFrameMargins(), getWindowFrameMargins(), windowFrameRect()
*/
void QGraphicsWidget::unsetWindowFrameMargins()
{
    Q_D(QGraphicsWidget);
    if ((d->windowFlags & Qt::Window) && (d->windowFlags & Qt::WindowType_Mask) != Qt::Popup && 
         (d->windowFlags & Qt::WindowType_Mask) != Qt::ToolTip && !(d->windowFlags & Qt::FramelessWindowHint)) {
        QStyleOptionTitleBar bar;
        d->initStyleOptionTitleBar(&bar);
        QStyle *style = this->style();
        qreal margin = style->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);
        qreal titleBarHeight  = d->titleBarHeight(bar);
        setWindowFrameMargins(margin, titleBarHeight, margin, margin);
    } else {
        setWindowFrameMargins(0, 0, 0, 0);
    }
    d->setWindowFrameMargins = false;
}

/*!
    Returns the widget's geometry in parent coordinates including any window
    frame.

    \sa windowFrameRect(), getWindowFrameMargins(), setWindowFrameMargins()
*/
QRectF QGraphicsWidget::windowFrameGeometry() const
{
    Q_D(const QGraphicsWidget);
    return geometry().adjusted(-d->leftWindowFrameMargin, -d->topWindowFrameMargin,
                               d->rightWindowFrameMargin, d->bottomWindowFrameMargin);
}

/*!
    Returns the widget's local rect including any window frame.

    \sa windowFrameGeometry(), getWindowFrameMargins(), setWindowFrameMargins()
*/
QRectF QGraphicsWidget::windowFrameRect() const
{
    Q_D(const QGraphicsWidget);
    return rect().adjusted(-d->leftWindowFrameMargin, -d->topWindowFrameMargin,
                           d->rightWindowFrameMargin, d->bottomWindowFrameMargin);
}

/*!
    Populates a style option object for this widget based on its current
    state, and stores the output in \a option. The default implementation
    populates \a option with the following properties.

    \table
      \header
        \o Style Option Property
        \o Value
      \row
        \o state & QStyle::State_Enabled
        \o Corresponds to QGraphicsItem::isEnabled().
      \row
        \o state & QStyle::State_HasFocus
        \o Corresponds to QGraphicsItem::hasFocus().
      \row
        \o state & QStyle::State_MouseOver
        \o Corresponds to QGraphicsItem::isUnderMouse().
      \row
        \o direction
        \o Corresponds to QGraphicsWidget::layoutDirection().
      \row
        \o rect
        \o Corresponds to QGraphicsWidget::rect().toRect().
      \row
        \o palette
        \o Corresponds to QGraphicsWidget::palette().
      \row
        \o fontMetrics
        \o Corresponds to QFontMetrics(QGraphicsWidget::font()).
    \endtable

    Subclasses of QGraphicsWidget should call the base implementation, and
    then test the type of \a option using qstyleoption_cast<>() or test
    QStyleOption::Type before storing widget-specific options.

    For example:

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

    \sa QStyleOption::initFrom()
*/
void QGraphicsWidget::initStyleOption(QStyleOption *option) const
{
    Q_ASSERT(option);

    option->state = QStyle::State_None;
    if (isEnabled())
        option->state |= QStyle::State_Enabled;
    if (hasFocus())
        option->state |= QStyle::State_HasFocus;
    // if (window->testAttribute(Qt::WA_KeyboardFocusChange)) // ### Window
    //     option->state |= QStyle::State_KeyboardFocusChange;
    if (isUnderMouse())
        option->state |= QStyle::State_MouseOver;
    if (QGraphicsWidget *w = window()) {
        if (w->isActiveWindow())
            option->state |= QStyle::State_Active;
    }
    if (isWindow())
        option->state |= QStyle::State_Window;
    /*
      ###
#ifdef Q_WS_MAC
    extern bool qt_mac_can_clickThrough(const QGraphicsWidget *w); //qwidget_mac.cpp
    if (!(option->state & QStyle::State_Active) && !qt_mac_can_clickThrough(widget))
        option->state &= ~QStyle::State_Enabled;

    switch (QMacStyle::widgetSizePolicy(widget)) {
    case QMacStyle::SizeSmall:
        option->state |= QStyle::State_Small;
        break;
    case QMacStyle::SizeMini:
        option->state |= QStyle::State_Mini;
        break;
    default:
        ;
    }
#endif
#ifdef QT_KEYPAD_NAVIGATION
    if (widget->hasEditFocus())
        state |= QStyle::State_HasEditFocus;
#endif
    */
    option->direction = layoutDirection();
    option->rect = rect().toRect(); // ### truncation!
    option->palette = palette();
    if (!isEnabled()) {
        option->palette.setCurrentColorGroup(QPalette::Disabled);
    } else if (isActiveWindow()) {
        option->palette.setCurrentColorGroup(QPalette::Active);
    } else {
        option->palette.setCurrentColorGroup(QPalette::Inactive);
    }
    option->fontMetrics = QFontMetrics(font());
}

/*!
    \reimp
*/
QSizeF QGraphicsWidget::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
    Q_D(const QGraphicsWidget);
    QSizeF sh;
    if (d->layout) {
        sh = d->layout->effectiveSizeHint(which, constraint);
        sh += QSizeF(d->leftMargin + d->rightMargin, d->topMargin + d->bottomMargin);
    } else {
        switch (which) {
            case Qt::MinimumSize:
                sh = QSizeF(0, 0);
                break;
            case Qt::PreferredSize:
                sh = QSizeF(50, 50);    //rather arbitrary
                break;
            case Qt::MaximumSize:
                sh = QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
                break;
            default:
                qWarning("QGraphicsWidget::sizeHint(): Don't know how to handle the value of 'which'");
                break;
        }
    }
    return sh;
}

/*!
    Returns this widget's layout, or 0 if no layout is currently managing this
    widget.

    \sa setLayout()
*/
QGraphicsLayout *QGraphicsWidget::layout() const
{
    Q_D(const QGraphicsWidget);
    return d->layout;
}

/*!
    \fn void QGraphicsWidget::setLayout(QGraphicsLayout *layout)

    Sets the layout for this widget to \a layout. Any existing layout manager
    is deleted before the new layout is assigned. If \a layout is 0, the
    widget is left without a layout. Existing subwidgets' geometries will
    remain unaffected.

    All widgets that are currently managed by \a layout or all of its
    sublayouts, are automatically reparented to this item. The layout is then
    invalidated, and the child widget geometries are adjusted according to
    this item's geometry() and contentsMargins(). Children who are not
    explicitly managed by \a layout remain unaffected by the layout after
    it has been assigned to this widget.

    QGraphicsWidget takes ownership of \a layout.

    \sa layout(), QGraphicsLinearLayout::addItem(), QGraphicsLayout::invalidate()
*/
void QGraphicsWidget::setLayout(QGraphicsLayout *l)
{
    Q_D(QGraphicsWidget);
    if (d->layout == l)
        return;
    d->setLayout_helper(l);
    if (!l)
        return;

    // Prevent assigning a layout that is already assigned to another widget.
    QGraphicsLayoutItem *oldParent = l->parentLayoutItem();
    if (oldParent && oldParent != this) {
        qWarning("QGraphicsWidget::setLayout: Attempting to set a layout on %s"
                 " \"%s\", when the layout already has a parent",
                 metaObject()->className(), qPrintable(objectName()));
        return;
    }

    // Install and activate the layout.
    l->setParentLayoutItem(this);
    l->d_func()->reparentChildItems(this);
    l->invalidate();
}

/*!
    Adjusts the size of the widget to its effective preferred size hint.

    This function is called implicitly when the item is shown for the first
    time.

    \sa effectiveSizeHint(), Qt::MinimumSize
*/
void QGraphicsWidget::adjustSize()
{
    QSizeF sz = effectiveSizeHint(Qt::PreferredSize);
    // What if sz is not valid?!
    if (sz.isValid())
        resize(sz);
}

/*!
    \property QGraphicsWidget::layoutDirection
    \brief the layout direction for this widget.

    This property modifies this widget's and all of its descendants'
    Qt::WA_RightToLeft attribute. It also sets this widget's
    Qt::WA_SetLayoutDirection attribute.

    The widget's layout direction determines the order in which the layout
    manager horizontally arranges subwidgets of this widget. The default
    value depends on the language and locale of the application, and is
    typically in the same direction as words are read and written. With
    Qt::LeftToRight, the layout starts placing subwidgets from the left
    side of this widget towards the right. Qt::RightToLeft does the opposite -
    the layout will place widgets starting from the right edge moving towards
    the left.

    Subwidgets inherit their layout direction from the parent. Top-level
    widget items inherit their layout direction from
    QGraphicsScene::layoutDirection. If you change a widget's layout direction
    by calling setLayoutDirection(), the widget will send itself a
    \l{QEvent::LayoutDirectionChange}{LayoutDirectionChange} event, and then
    propagate the new layout direction to all its descendants.

    \sa QWidget::layoutDirection, QApplication::layoutDirection
*/
Qt::LayoutDirection QGraphicsWidget::layoutDirection() const
{
    return testAttribute(Qt::WA_RightToLeft) ? Qt::RightToLeft : Qt::LeftToRight;
}
void QGraphicsWidget::setLayoutDirection(Qt::LayoutDirection direction)
{
    Q_D(QGraphicsWidget);
    setAttribute(Qt::WA_SetLayoutDirection, true);
    d->setLayoutDirection_helper(direction);
}
void QGraphicsWidget::unsetLayoutDirection()
{
    Q_D(QGraphicsWidget);
    setAttribute(Qt::WA_SetLayoutDirection, false);
    d->resolveLayoutDirection();
}

/*!
    Returns a pointer to the widget's style. If this widget does not have any
    explicitly assigned style, the scene's style is returned instead. In turn,
    if the scene does not have any assigned style, this function returns
    QApplication::style().

    \sa setStyle()
*/
QStyle *QGraphicsWidget::style() const
{
    if (QStyle *style = widgetStyles()->styleForWidget(this))
        return style;
    // ### This is not thread-safe. QApplication::style() is not thread-safe.
    return scene() ? scene()->style() : QApplication::style();
}

/*!
    Sets the widget's style to \a style. QGraphicsWidget does \e not take
    ownership of \a style.

    If no style is assigned, or \a style is 0, the widget will use
    QGraphicsScene::style() (if this has been set). Otherwise the widget will
    use QApplication::style().

    This function sets the Qt::WA_SetStyle attribute if \a style is not 0;
    otherwise it clears the attribute.

    \sa style()
*/
void QGraphicsWidget::setStyle(QStyle *style)
{
    setAttribute(Qt::WA_SetStyle, style != 0);
    widgetStyles()->setStyleForWidget(this, style);

    // Deliver StyleChange to the widget itself (doesn't propagate).
    QEvent event(QEvent::StyleChange);
    QApplication::sendEvent(this, &event);
}

/*!
    \property QGraphicsWidget::font
    \brief the widgets' font

    This property provides the widget's font.

    QFont consists of font properties that have been explicitly defined and
    properties implicitly inherited from the widget's parent. Hence, font()
    can return a different font compared to the one set with setFont().
    This scheme allows you to define single entries in a font without
    affecting the font's inherited entries.

    When a widget's font changes, it resolves its entries against its
    parent widget. If the widget does not have a parent widget, it resolves
    its entries against the scene. The widget then sends itself a
    \l{QEvent::FontChange}{FontChange} event and notifies all its
    descendants so that they can resolve their fonts as well.

    By default, this property contains the application's default font.

    \sa QApplication::font(), QGraphicsScene::font, QFont::resolve()
*/
QFont QGraphicsWidget::font() const
{
    Q_D(const QGraphicsWidget);
    return d->font;
}
void QGraphicsWidget::setFont(const QFont &font)
{
    Q_D(QGraphicsWidget);
    setAttribute(Qt::WA_SetFont, font.resolve() != 0);

    QFont naturalFont = d->naturalWidgetFont();
    QFont resolvedFont = font.resolve(naturalFont);
    d->setFont_helper(resolvedFont);
}

/*!
    \property QGraphicsWidget::palette
    \brief the widget's palette

    This property provides the widget's palette. The palette provides colors
    and brushes for color groups (e.g., QPalette::Button) and states (e.g.,
    QPalette::Inactive), loosely defining the general look of the widget and
    its children.

    QPalette consists of color groups that have been explicitly defined, and
    groups that are implicitly inherited from the widget's parent. Because of
    this, palette() can return a different palette than what has been set with
    setPalette(). This scheme allows you to define single entries in a palette
    without affecting the palette's inherited entries.

    When a widget's palette changes, it resolves its entries against its
    parent widget, or if it doesn't have a parent widget, it resolves against
    the scene. It then sends itself a \l{QEvent::PaletteChange}{PaletteChange}
    event, and notifies all its descendants so they can resolve their palettes
    as well.

    By default, this property contains the application's default palette.

    \sa QApplication::palette(), QGraphicsScene::palette, QPalette::resolve()
*/
QPalette QGraphicsWidget::palette() const
{
    Q_D(const QGraphicsWidget);
    return d->palette;
}
void QGraphicsWidget::setPalette(const QPalette &palette)
{
    Q_D(QGraphicsWidget);
    setAttribute(Qt::WA_SetPalette, palette.resolve() != 0);

    QPalette naturalPalette = d->naturalWidgetPalette();
    QPalette resolvedPalette = palette.resolve(naturalPalette);
    d->setPalette_helper(resolvedPalette);
}

/*!
    If this widget is currently managed by a layout, this function notifies
    the layout that the widget's size hints have changed and the layout
    may need to resize and reposition the widget accordingly.

    Call this function if the widget's sizeHint() has changed.

    \sa QGraphicsLayout::invalidate()
*/
void QGraphicsWidget::updateGeometry()
{
    QGraphicsLayoutItem::updateGeometry();
    QGraphicsLayoutItem *parentItem = parentLayoutItem();

    if (parentItem && parentItem->isLayout()) {
        parentItem->updateGeometry();
    } else {
        if (parentItem) {
            QGraphicsWidget *parentWid = parentWidget();    //###
            if (parentWid->isVisible())
                QApplication::postEvent(parentWid, new QEvent(QEvent::LayoutRequest));
        }
        bool wasResized = testAttribute(Qt::WA_Resized);
        resize(size()); // this will restrict the size
        setAttribute(Qt::WA_Resized, wasResized);
    }
}

/*!
    \reimp

    QGraphicsWidget uses the base implementation of this function to catch and
    deliver events related to state changes in the item. Because of this, it is
    very important that subclasses call the base implementation.

    For example, QGraphicsWidget uses ItemVisibleChange to deliver \l Show and
    \l Hide events, ItemPositionHasChanged to deliver \l Move events, and
    ItemParentChange both to deliver \l ParentChange events, and for managing
    the focus chain.

    \sa propertyChange()
*/
QVariant QGraphicsWidget::itemChange(GraphicsItemChange change, const QVariant &value)
{
    Q_D(QGraphicsWidget);
    switch (change) {
    case ItemEnabledHasChanged: {
        // Send EnabledChange after the enabled state has changed.
        QEvent event(QEvent::EnabledChange);
        QApplication::sendEvent(this, &event);
        break;
    }
    case ItemVisibleChange:
        if (value.toBool()) {
            // Send Show event before the item has been shown.
            QShowEvent event;
            QApplication::sendEvent(this, &event);
            bool resized = testAttribute(Qt::WA_Resized);
            if (!resized) {
                adjustSize();
                setAttribute(Qt::WA_Resized, false);
            }
        }
        break;
    case ItemVisibleHasChanged:
        if (!value.toBool()) {
            // Send Hide event after the item has been hidden.
            QHideEvent event;
            QApplication::sendEvent(this, &event);
        }
        break;
    case ItemPositionHasChanged:
        if (!d->inSetGeometry) {
            d->inSetPos = 1;
            // Ensure setGeometry is called (avoid recursion when setPos is
            // called from within setGeometry).
            setGeometry(QRectF(pos(), size()));
            d->inSetPos = 0 ;
        }
        break;
    case ItemParentChange: {
        QGraphicsItem *parent = qVariantValue<QGraphicsItem *>(value);
        d->fixFocusChainBeforeReparenting((parent && parent->isWidget()) ? static_cast<QGraphicsWidget *>(parent) : 0);

        // Deliver ParentAboutToChange.
        QEvent event(QEvent::ParentAboutToChange);
        QApplication::sendEvent(this, &event);
        break;
    }
    case ItemParentHasChanged: {
        // reset window type on parent change in order to automagically remove decorations etc.
        Qt::WindowFlags wflags = d->windowFlags & ~Qt::WindowType_Mask;
        d->adjustWindowFlags(&wflags);
        setWindowFlags(wflags);
        // Deliver ParentChange.
        QEvent event(QEvent::ParentChange);
        QApplication::sendEvent(this, &event);
        break;
    }
    case ItemCursorChange: {
        // Deliver CursorChange.
        QEvent event(QEvent::CursorChange);
        QApplication::sendEvent(this, &event);
        break;
    }
    case ItemToolTipChange: {
        // Deliver ToolTipChange.
        QEvent event(QEvent::ToolTipChange);
        QApplication::sendEvent(this, &event);
        break;
    }
    default:
        break;
    }
    return QGraphicsItem::itemChange(change, value);
}

/*!
    \internal

    This virtual function is used to notify changes to any property (both
    dynamic properties, and registered with Q_PROPERTY) in the
    widget. Depending on the property itself, the notification can be
    delivered before or after the value has changed.

    \a propertyName is the name of the property (e.g., "size" or "font"), and
    \a value is the (proposed) new value of the property. The function returns
    the new value, which may be different from \a value if the notification
    supports adjusting the property value. The base implementation simply
    returns \a value for any \a propertyName.

    QGraphicsWidget delivers notifications for the following properties:

    \table     \o propertyName        \o Property
    \row       \o layoutDirection     \o QGraphicsWidget::layoutDirection
    \row       \o size                \o QGraphicsWidget::size
    \row       \o font                \o QGraphicsWidget::font
    \row       \o palette             \o QGraphicsWidget::palette
    \endtable

    \sa itemChange()
*/
QVariant QGraphicsWidget::propertyChange(const QString &propertyName, const QVariant &value)
{
    Q_UNUSED(propertyName);
    return value;
}

/*!
    QGraphicsWidget's implementation of sceneEvent() simply passes \a event to
    QGraphicsWidget::event(). You can handle all events for your widget in
    event() or in any of the convenience functions; you should not have to
    reimplement this function in a subclass of QGraphicsWidget.

    \sa QGraphicsItem::sceneEvent()
*/
bool QGraphicsWidget::sceneEvent(QEvent *event)
{
    return QCoreApplication::sendEvent(this, event) || QGraphicsItem::sceneEvent(event);
}

/*!
    This event handler, for \a event, receives events for the window frame if
    this widget is a window. Its base implementation provides support for
    default window frame interaction such as moving, resizing, etc.

    You can reimplement this handler in a subclass of QGraphicsWidget to
    provide your own custom window frame interaction support.

    Returns true if \a event has been recognized and processed; otherwise,
    returns false.
    
    \sa event()
*/
bool QGraphicsWidget::windowFrameEvent(QEvent *event)
{
    Q_D(QGraphicsWidget);
    switch (event->type()) {
    case QEvent::GraphicsSceneMousePress:
        d->windowFrameMousePressEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
        break;
    case QEvent::GraphicsSceneMouseMove:
        if (d->grabbedSection != Qt::NoSection) {
            d->windowFrameMouseMoveEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
            event->accept();
        }
        break;
    case QEvent::GraphicsSceneMouseRelease:
        d->windowFrameMouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent *>(event));
        break;
    case QEvent::GraphicsSceneHoverMove:
        d->windowFrameHoverMoveEvent(static_cast<QGraphicsSceneHoverEvent *>(event));
        break;
    case QEvent::GraphicsSceneHoverLeave:
        d->windowFrameHoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent *>(event));
        break;
    default:
        break;
    }
    return event->isAccepted();
}

/*!
    \since 4.4

    Returns the window frame section at position \a pos, or
    Qt::NoSection if there is no window frame section at this
    position.

    This function is used in QGraphicsWidget's base implementation for window
    frame interaction.

    You can reimplement this function if you want to customize how a window
    can be interactively moved or resized.  For instance, if you only want to
    allow a window to be resized by the bottom right corner, you can
    reimplement this function to return Qt::NoSection for all sections except
    Qt::BottomRightSection.

    \sa windowFrameEvent(), paintWindowFrame(), windowFrameGeometry()
*/
Qt::WindowFrameSection QGraphicsWidget::windowFrameSectionAt(const QPointF &pos) const
{
    Q_D(const QGraphicsWidget);

    const QRectF r = windowFrameRect();
    if (!r.contains(pos))
        return Qt::NoSection;
    
    const qreal left = r.left();
    const qreal top = r.top();
    const qreal right = r.right();
    const qreal bottom = r.bottom();
    const qreal x = pos.x();
    const qreal y = pos.y();

    const qreal cornerMargin = 20;
    //### Not sure of this one, it should be the same value for all edges.
    const qreal windowFrameWidth = d->leftWindowFrameMargin;

    Qt::WindowFrameSection s = Qt::NoSection;
    if (x <= left + cornerMargin) {
        if (y <= top + windowFrameWidth || (x <= left + windowFrameWidth && y <= top + cornerMargin)) {
            s = Qt::TopLeftSection;
        } else if (y >= bottom - windowFrameWidth || (x <= left + windowFrameWidth && y >= bottom - windowFrameWidth)) {
            s = Qt::BottomLeftSection;
        } else if (x <= left + windowFrameWidth) {
            s = Qt::LeftSection;
        }
    } else if (x >= right - cornerMargin) {
        if (y <= top + windowFrameWidth || (x >= right - windowFrameWidth && y <= top + cornerMargin)) {
            s = Qt::TopRightSection;
        } else if (y >= bottom - windowFrameWidth || (x >= right - windowFrameWidth && y >= bottom - windowFrameWidth)) {
            s = Qt::BottomRightSection;
        } else if (x >= right - windowFrameWidth) {
            s = Qt::RightSection;
        }
    } else if (y <= top + windowFrameWidth) {
        s = Qt::TopSection;
    } else if (y >= bottom - windowFrameWidth) {
        s = Qt::BottomSection;
    }
    if (s == Qt::NoSection) {
        QRectF r1 = r;
        r1.setHeight(d->topWindowFrameMargin);
        if (r1.contains(pos))
            s = Qt::TitleBarArea;
    }
    return s;
}

/*!
    \reimp

    QGraphicsWidget handles the following events:

    \table   \o Event                 \o Usage
    \row     \o Polish
                    \o Delivered to the widget some time after it has been
                        shown.
    \row     \o GraphicsSceneMove
                    \o Delivered to the widget after its local position has
                        changed.
    \row     \o GraphicsSceneResize
                    \o Delivered to the widget after its size has changed.
    \row     \o Show
                    \o Delivered to the widget before it has been shown.
    \row     \o Hide
                    \o Delivered to the widget after it has been hidden.
    \row     \o PaletteChange
                    \o Delivered to the widget after its palette has changed.
    \row     \o FontChange
                    \o Delivered to the widget after its font has changed.
    \row     \o EnabledChange
                    \o Delivered to the widget after its enabled state has
                        changed.
    \row     \o StyleChange
                    \o Delivered to the widget after its style has changed.
    \row     \o LayoutDirectionChange
                    \o Delivered to the widget after its layout direction has
                        changed.
    \row     \o ContentsRectChange
                    \o Delivered to the widget after its contents margins/
                        contents rect has changed.
    \endtable
*/
bool QGraphicsWidget::event(QEvent *event)
{
    Q_D(QGraphicsWidget);
    // Forward the event to the layout first.
    if (d->layout)
        d->layout->widgetEvent(event);

    // Handle the event itself.
    switch (event->type()) {
    case QEvent::GraphicsSceneMove:
        moveEvent(static_cast<QGraphicsSceneMoveEvent *>(event));
        break;
    case QEvent::GraphicsSceneResize:
        resizeEvent(static_cast<QGraphicsSceneResizeEvent *>(event));
        break;
    case QEvent::Show:
        showEvent(static_cast<QShowEvent *>(event));
        break;
    case QEvent::Hide:
        hideEvent(static_cast<QHideEvent *>(event));
        break;
    case QEvent::Polish:
        polishEvent();
        d->polished = true;
        d->updateFont(d->font);
        break;
    case QEvent::WindowActivate:
    case QEvent::WindowDeactivate:
        update();
        foreach (QGraphicsItem *child, childItems()) {
            if (child->isWidget())
                QApplication::sendEvent(static_cast<QGraphicsWidget *>(child), event);
        }
        break;
        // Taken from QWidget::event
    case QEvent::ActivationChange:
    case QEvent::EnabledChange:
    case QEvent::FontChange:
    case QEvent::StyleChange:
    case QEvent::PaletteChange:
    case QEvent::ParentChange:
    case QEvent::ContentsRectChange:
    case QEvent::LayoutDirectionChange:
        changeEvent(event);
        break;
    case QEvent::Close:
        closeEvent((QCloseEvent *)event);
        break;
    case QEvent::GrabMouse:
        grabMouseEvent(event);
        break;
    case QEvent::UngrabMouse:
        ungrabMouseEvent(event);
        break;
    case QEvent::GrabKeyboard:
        grabKeyboardEvent(event);
        break;
    case QEvent::UngrabKeyboard:
        ungrabKeyboardEvent(event);
        break;
    case QEvent::GraphicsSceneMousePress:
        if (d->hasDecoration() && windowFrameEvent(event))
            return true;
    case QEvent::GraphicsSceneMouseMove:
    case QEvent::GraphicsSceneMouseRelease:
    case QEvent::GraphicsSceneMouseDoubleClick:
        if (d->hasDecoration() && d->grabbedSection != Qt::NoSection)
            return windowFrameEvent(event);
        break;
    case QEvent::GraphicsSceneHoverEnter:
    case QEvent::GraphicsSceneHoverMove:
    case QEvent::GraphicsSceneHoverLeave:
        if (d->hasDecoration()) {
            windowFrameEvent(event);
            // Filter out hover events if they were sent to us only because of the
            // decoration (special case in QGraphicsScenePrivate::dispatchHoverEvent).
            if (!acceptsHoverEvents())
                return true;
        }
        break;
    default:
        break;
    }
    return QObject::event(event);
}

/*!
   This event handler can be reimplemented to handle state changes.

   The state being changed in this event can be retrieved through \a event.

   Change events include: QEvent::ActivationChange, QEvent::EnabledChange,
   QEvent::FontChange, QEvent::StyleChange, QEvent::PaletteChange,
   QEvent::ParentChange, QEvent::LayoutDirectionChange, and
   QEvent::ContentsRectChange.
*/
void QGraphicsWidget::changeEvent(QEvent *event)
{
    Q_D(QGraphicsWidget);
    switch (event->type()) {
    case QEvent::StyleChange:
        // ### Don't unset if the margins are explicitly set.
        unsetWindowFrameMargins();
    case QEvent::FontChange:
        update();
        updateGeometry();
        break;
    case QEvent::PaletteChange:
        update();
        break;
    case QEvent::ParentChange:
        d->resolveFont(d->inheritedFontResolveMask);
        d->resolvePalette(d->inheritedPaletteResolveMask);
        break;
    default:
        break;
    }
}

/*!
    This event handler, for \a event, can be reimplemented in a subclass to
    receive widget close events.  The default implementation accepts the
    event.

    \sa close(), QCloseEvent
*/
void QGraphicsWidget::closeEvent(QCloseEvent *event)
{
    event->accept();
}

/*!
    \reimp
*/
void QGraphicsWidget::focusInEvent(QFocusEvent *event)
{
    Q_UNUSED(event);
    if (focusPolicy() != Qt::NoFocus)
        update();
}

/*!
    Finds a new widget to give the keyboard focus to, as appropriate for Tab
    and Shift+Tab, and returns true if it can find a new widget; returns false
    otherwise. If \a next is true, this function searches forward; if \a next
    is false, it searches backward.

    Sometimes, you will want to reimplement this function to provide special
    focus handling for your widget and its subwidgets. For example, a web
    browser might reimplement it to move its current active link forward or
    backward, and call the base implementation only when it reaches the last
    or first link on the page.

    Child widgets call focusNextPrevChild() on their parent widgets, but only
    the window that contains the child widgets decides where to redirect
    focus. By reimplementing this function for an object, you gain control of
    focus traversal for all child widgets.

    \sa focusPolicy()
*/
bool QGraphicsWidget::focusNextPrevChild(bool next)
{
    Q_D(QGraphicsWidget);
    // Let the parent's focusNextPrevChild implementation decide what to do.
    QGraphicsWidget *parent = 0;
    if (!isWindow() && (parent = parentWidget()))
        return parent->focusNextPrevChild(next);
    if (!d->scene)
        return false;
    if (d->scene->focusNextPrevChild(next))
        return true;
    if (isWindow()) {
        setFocus(next ? Qt::TabFocusReason : Qt::BacktabFocusReason);
        if (hasFocus())
            return true;
    }
    return false;
}

/*!
    \reimp
*/
void QGraphicsWidget::focusOutEvent(QFocusEvent *event)
{
    Q_UNUSED(event);
    if (focusPolicy() != Qt::NoFocus)
        update();
}

/*!
    This event handler, for \l{QEvent::Hide}{Hide} events, is delivered after
    the widget has been hidden, for example, setVisible(false) has been called
    for the widget or one of its ancestors when the widget was previously
    shown.

    You can reimplement this event handler to detect when your widget is
    hidden. Calling QEvent::accept() or QEvent::ignore() on \a event has no
    effect.

    \sa showEvent(), QWidget::hideEvent(), ItemVisibleChange
*/
void QGraphicsWidget::hideEvent(QHideEvent *event)
{
    ///### focusNextPrevChild(true), don't lose focus when the focus widget
    // is hidden.
    Q_UNUSED(event);
}

/*!
    This event handler, for \l{QEvent::GraphicsSceneMove}{GraphicsSceneMove}
    events, is delivered after the widget has moved (e.g., its local position
    has changed).

    This event is only delivered when the item is moved locally. Calling
    setTransform() or moving any of the item's ancestors does not affect the
    item's local position.

    You can reimplement this event handler to detect when your widget has
    moved. Calling QEvent::accept() or QEvent::ignore() on \a event has no
    effect.

    \sa ItemPositionChange, ItemPositionHasChanged
*/
void QGraphicsWidget::moveEvent(QGraphicsSceneMoveEvent *event)
{
    // ### Last position is always == current position
    Q_UNUSED(event);
}

/*!
    This event is delivered to the item by the scene at some point after it
    has been constructed, but before it is shown or otherwise accessed through
    the scene. You can use this event handler to do last-minute initializations
    of the widget which require the item to be fully constructed.

    The base implementation does nothing.
*/
void QGraphicsWidget::polishEvent()
{
}

/*!
    This event handler, for
    \l{QEvent::GraphicsSceneResize}{GraphicsSceneResize} events, is
    delivered after the widget has been resized (i.e., its local size has
    changed). \a event contains both the old and the new size.

    This event is only delivered when the widget is resized locally; calling
    setTransform() on the widget or any of its ancestors or view, does not
    affect the widget's local size.

    You can reimplement this event handler to detect when your widget has been
    resized. Calling QEvent::accept() or QEvent::ignore() on \a event has no
    effect.

    \sa geometry(), setGeometry()
*/
void QGraphicsWidget::resizeEvent(QGraphicsSceneResizeEvent *event)
{
    Q_UNUSED(event);
}

/*!
    This event handler, for \l{QEvent::Show}{Show} events, is delivered before
    the widget has been shown, for example, setVisible(true) has been called
    for the widget or one of its ancestors when the widget was previously
    hidden.

    You can reimplement this event handler to detect when your widget is
    shown. Calling QEvent::accept() or QEvent::ignore() on \a event has no
    effect.

    \sa hideEvent(), QWidget::showEvent(), ItemVisibleChange
*/
void QGraphicsWidget::showEvent(QShowEvent *event)
{
    Q_UNUSED(event);
}

/*!
    \reimp
*/
void QGraphicsWidget::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
{
    Q_UNUSED(event);
}

/*!
    \reimp
*/
void QGraphicsWidget::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
{
    Q_UNUSED(event);
}

/*!
    This event handler, for \a event, can be reimplemented in a subclass to
    receive notifications for Qt::GrabMouse events.

    \sa grabMouse(), grabKeyboard()
*/
void QGraphicsWidget::grabMouseEvent(QEvent *event)
{
    Q_UNUSED(event);
}

/*!
    This event handler, for \a event, can be reimplemented in a subclass to
    receive notifications for Qt::UngrabMouse events.

    \sa ungrabMouse(), ungrabKeyboard()
*/
void QGraphicsWidget::ungrabMouseEvent(QEvent *event)
{
    Q_UNUSED(event);
}

/*!
    This event handler, for \a event, can be reimplemented in a subclass to
    receive notifications for Qt::GrabKeyboard events.

    \sa grabKeyboard(), grabMouse()
*/
void QGraphicsWidget::grabKeyboardEvent(QEvent *event)
{
    Q_UNUSED(event);
}

/*!
    This event handler, for \a event, can be reimplemented in a subclass to
    receive notifications for Qt::UngrabKeyboard events.

    \sa ungrabKeyboard(), ungrabMouse()
*/
void QGraphicsWidget::ungrabKeyboardEvent(QEvent *event)
{
    Q_UNUSED(event);
}

/*!
    Returns the widgets window type.
*/
Qt::WindowType QGraphicsWidget::windowType() const
{
    return Qt::WindowType(int(windowFlags()) & Qt::WindowType_Mask);
}

/*!
    \property QGraphicsWidget::windowFlags
    \brief the widget's window flags

    Window flags are a combination of a window type (e.g., Qt::Dialog) and
    several flags giving hints on the behavior of the window. The behavior
    is platform-dependent.

    By default, this property contains no window flags.
*/
Qt::WindowFlags QGraphicsWidget::windowFlags() const
{
    Q_D(const QGraphicsWidget);
    return d->windowFlags;
}
void QGraphicsWidget::setWindowFlags(Qt::WindowFlags wFlags)
{
    Q_D(QGraphicsWidget);
    if (d->windowFlags == wFlags)
        return;
    bool wasPopup = (d->windowFlags & Qt::WindowType_Mask) == Qt::Popup;

    d->windowFlags = wFlags;
    if (!d->setWindowFrameMargins)
        unsetWindowFrameMargins();

    bool isPopup = (d->windowFlags & Qt::WindowType_Mask) == Qt::Popup;
    if (d->scene && isVisible() && wasPopup != isPopup) {
        // Popup state changed; update implicit mouse grab.
        if (!isPopup)
            d->scene->d_func()->removePopup(this);
        else
            d->scene->d_func()->addPopup(this);
    }

    if (d->scene && d->scene->d_func()->allItemsIgnoreHoverEvents && d->hasDecoration()) {
        d->scene->d_func()->allItemsIgnoreHoverEvents = false;
        d->scene->d_func()->enableMouseTrackingOnViews();
    }
}

/*!
    Returns true if this widget's window is in the active window, or if the
    widget does not have a window but is in an active scene (i.e., a scene
    that currently has focus).

    The active window is the window that either contains a child widget that
    currently has input focus, or that itself has input focus.

    \sa QGraphicsScene::activeWindow(), QGraphicsScene::setActiveWindow()
*/
bool QGraphicsWidget::isActiveWindow() const
{
    Q_D(const QGraphicsWidget);
    if (!d->scene)
        return false;
    const QGraphicsWidget *w = window();
    return (!w && d->scene->d_func()->activationRefCount) || (w && d->scene->activeWindow() == w);
}

/*!
    \property QGraphicsWidget::windowTitle
    \brief This property holds the window title (caption).

    This property is only used for windows.

    By default, if no title has been set, this property contains an empty string.
*/
void QGraphicsWidget::setWindowTitle(const QString &title)
{
    Q_D(QGraphicsWidget);
    d->windowTitle = title;
}
QString QGraphicsWidget::windowTitle() const
{
    Q_D(const QGraphicsWidget);
    return d->windowTitle;
}

/*!
    \property QGraphicsWidget::focusPolicy
    \brief the way the widget accepts keyboard focus

    The focus policy is Qt::TabFocus if the widget accepts keyboard focus by
    tabbing, Qt::ClickFocus if the widget accepts focus by clicking,
    Qt::StrongFocus if it accepts both, and Qt::NoFocus (the default) if it
    does not accept focus at all.

    You must enable keyboard focus for a widget if it processes keyboard
    events. This is normally done from the widget's constructor. For instance,
    the QLineEdit constructor calls setFocusPolicy(Qt::StrongFocus).

    If you enable a focus policy (i.e., not Qt::NoFocus), QGraphicsWidget will
    automatically enable the ItemIsFocusable flag.  Setting Qt::NoFocus on a
    widget will clear the ItemIsFocusable flag. If the widget currently has
    keyboard focus, the widget will automatically lose focus.

    \sa focusInEvent(), focusOutEvent(), keyPressEvent(), keyReleaseEvent(), enabled
*/
Qt::FocusPolicy QGraphicsWidget::focusPolicy() const
{
    Q_D(const QGraphicsWidget);
    return d->focusPolicy;
}
void QGraphicsWidget::setFocusPolicy(Qt::FocusPolicy policy)
{
    Q_D(QGraphicsWidget);
    if (d->focusPolicy == policy)
        return;
    d->focusPolicy = policy;
    if (hasFocus() && policy == Qt::NoFocus)
        clearFocus();
    setFlag(ItemIsFocusable, policy != Qt::NoFocus);
}

/*!
    If this widget, a child or descendant of this widget currently has input
    focus, this function will return a pointer to that widget. If
    no descendant has input focus, 0 is returned.

    \sa QWidget::focusWidget()
*/
QGraphicsWidget *QGraphicsWidget::focusWidget() const
{
    Q_D(const QGraphicsWidget);
    return d->focusChild;
}


#ifndef QT_NO_SHORTCUT
/*!
    \since 4.5

    Adds a shortcut to Qt's shortcut system that watches for the given key \a
    sequence in the given \a context. If the \a context is
    Qt::ApplicationShortcut, the shortcut applies to the application as a
    whole. Otherwise, it is either local to this widget, Qt::WidgetShortcut,
    or to the window itself, Qt::WindowShortcut. For widgets that are not part
    of a window (i.e., top-level widgets and their children),
    Qt::WindowShortcut shortcuts apply to the scene.

    If the same key \a sequence has been grabbed by several widgets,
    when the key \a sequence occurs a QEvent::Shortcut event is sent
    to all the widgets to which it applies in a non-deterministic
    order, but with the ``ambiguous'' flag set to true.

    \warning You should not normally need to use this function;
    instead create \l{QAction}s with the shortcut key sequences you
    require (if you also want equivalent menu options and toolbar
    buttons), or create \l{QShortcut}s if you just need key sequences.
    Both QAction and QShortcut handle all the event filtering for you,
    and provide signals which are triggered when the user triggers the
    key sequence, so are much easier to use than this low-level
    function.

    \sa releaseShortcut() setShortcutEnabled() QWidget::grabShortcut()
*/
int QGraphicsWidget::grabShortcut(const QKeySequence &sequence, Qt::ShortcutContext context)
{
    Q_ASSERT(qApp);
    if (sequence.isEmpty())
        return 0;
    // ### setAttribute(Qt::WA_GrabbedShortcut);
    return qApp->d_func()->shortcutMap.addShortcut(this, sequence, context);
}

/*!
    \since 4.5

    Removes the shortcut with the given \a id from Qt's shortcut
    system. The widget will no longer receive QEvent::Shortcut events
    for the shortcut's key sequence (unless it has other shortcuts
    with the same key sequence).

    \warning You should not normally need to use this function since
    Qt's shortcut system removes shortcuts automatically when their
    parent widget is destroyed. It is best to use QAction or
    QShortcut to handle shortcuts, since they are easier to use than
    this low-level function. Note also that this is an expensive
    operation.

    \sa grabShortcut() setShortcutEnabled() , QWidget::releaseShortcut()
*/
void QGraphicsWidget::releaseShortcut(int id)
{
    Q_ASSERT(qApp);
    if (id)
        qApp->d_func()->shortcutMap.removeShortcut(id, this, 0);
}

/*!
    \since 4.5

    If \a enabled is true, the shortcut with the given \a id is
    enabled; otherwise the shortcut is disabled.

    \warning You should not normally need to use this function since
    Qt's shortcut system enables/disables shortcuts automatically as
    widgets become hidden/visible and gain or lose focus. It is best
    to use QAction or QShortcut to handle shortcuts, since they are
    easier to use than this low-level function.

    \sa grabShortcut() releaseShortcut(), QWidget::setShortcutEnabled()
*/
void QGraphicsWidget::setShortcutEnabled(int id, bool enabled)
{
    Q_ASSERT(qApp);
    if (id)
        qApp->d_func()->shortcutMap.setShortcutEnabled(enabled, id, this, 0);
}

/*!
    \since 4.5

    If \a enabled is true, auto repeat of the shortcut with the
    given \a id is enabled; otherwise it is disabled.

    \sa grabShortcut() releaseShortcut() QWidget::setShortcutAutoRepeat()
*/
void QGraphicsWidget::setShortcutAutoRepeat(int id, bool enabled)
{
    Q_ASSERT(qApp);
    if (id)
        qApp->d_func()->shortcutMap.setShortcutAutoRepeat(enabled, id, this, 0);
}
#endif

#ifndef QT_NO_ACTION
/*!
    \since 4.5

    Appends the action \a action to this widget's list of actions.

    All QGraphicsWidgets have a list of \l{QAction}s, however they can be
    represented graphically in many different ways. The default use of the
    QAction list (as returned by actions()) is to create a context QMenu.

    A QGraphicsWidget should only have one of each action and adding an action
    it already has will not cause the same action to be in the widget twice.

    \sa removeAction(), insertAction(), actions(), QWidget::addAction()
*/
void QGraphicsWidget::addAction(QAction *action)
{
    insertAction(0, action);
}

/*!
    \since 4.5

    Appends the actions \a actions to this widget's list of actions.

    \sa removeAction(), QMenu, addAction(), QWidget::addActions()
*/
void QGraphicsWidget::addActions(QList<QAction *> actions)
{
    for (int i = 0; i < actions.count(); ++i)
        insertAction(0, actions.at(i));
}

/*!
    \since 4.5

    Inserts the action \a action to this widget's list of actions,
    before the action \a before. It appends the action if \a before is 0 or
    \a before is not a valid action for this widget.

    A QGraphicsWidget should only have one of each action.

    \sa removeAction(), addAction(), QMenu, actions(),
    QWidget::insertActions()
*/
void QGraphicsWidget::insertAction(QAction *before, QAction *action)
{
    if (!action) {
        qWarning("QWidget::insertAction: Attempt to insert null action");
        return;
    }

    Q_D(QGraphicsWidget);
    int index = d->actions.indexOf(action);
    if (index != -1)
        d->actions.removeAt(index);

    int pos = d->actions.indexOf(before);
    if (pos < 0) {
        before = 0;
        pos = d->actions.size();
    }
    d->actions.insert(pos, action);

    QActionPrivate *apriv = action->d_func();
    apriv->graphicsWidgets.append(this);

    QActionEvent e(QEvent::ActionAdded, action, before);
    QApplication::sendEvent(this, &e);
}

/*!
    \since 4.5

    Inserts the actions \a actions to this widget's list of actions,
    before the action \a before. It appends the action if \a before is 0 or
    \a before is not a valid action for this widget.

    A QGraphicsWidget can have at most one of each action.

    \sa removeAction(), QMenu, insertAction(), QWidget::insertActions()
*/
void QGraphicsWidget::insertActions(QAction *before, QList<QAction *> actions)
{
    for (int i = 0; i < actions.count(); ++i)
        insertAction(before, actions.at(i));
}

/*!
    \since 4.5

    Removes the action \a action from this widget's list of actions.

    \sa insertAction(), actions(), insertAction(), QWidget::removeAction()
*/
void QGraphicsWidget::removeAction(QAction *action)
{
    if (!action)
        return;

    Q_D(QGraphicsWidget);

    QActionPrivate *apriv = action->d_func();
    apriv->graphicsWidgets.removeAll(this);

    if (d->actions.removeAll(action)) {
        QActionEvent e(QEvent::ActionRemoved, action);
        QApplication::sendEvent(this, &e);
    }
}

/*!
    \since 4.5

    Returns the (possibly empty) list of this widget's actions.

    \sa insertAction(), removeAction(), QWidget::actions(),
    QAction::associatedWidgets(), QAction::associatedGraphicsWidgets()
*/
QList<QAction *> QGraphicsWidget::actions() const
{
    Q_D(const QGraphicsWidget);
    return d->actions;
}
#endif

/*!
    Moves the \a second widget around the ring of focus widgets so that
    keyboard focus moves from the \a first widget to the \a second widget when
    the Tab key is pressed.

    Note that since the tab order of the \a second widget is changed, you
    should order a chain like this:

    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicswidget.cpp 1

    \e not like this:

    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicswidget.cpp 2

    If \a first is 0, this indicates that \a second should be the first widget
    to receive input focus should the scene gain Tab focus (i.e., the user
    hits Tab so that focus passes into the scene). If \a second is 0, this
    indicates that \a first should be the first widget to gain focus if the
    scene gained BackTab focus.

    By default, tab order is defined implicitly using widget creation order.

    \sa focusPolicy, {Keyboard Focus}
*/
void QGraphicsWidget::setTabOrder(QGraphicsWidget *first, QGraphicsWidget *second)
{
    if (!first && !second) {
        qWarning("QGraphicsWidget::setTabOrder(0, 0) is undefined");
        return;
    }
    if ((first && second) && first->scene() != second->scene()) {
        qWarning("QGraphicsWidget::setTabOrder: scenes %p and %p are different",
                 first->scene(), second->scene());
        return;
    }
    QGraphicsScene *scene = first ? first->scene() : second->scene();
    if (!scene && (!first || !second)) {
        qWarning("QGraphicsWidget::setTabOrder: assigning tab order from/to the"
                 " scene requires the item to be in a scene.");
        return;
    }

    // If either first or second are 0, the scene's tabFocusFirst is updated
    // to point to the first item in the scene's focus chain. Then first or
    // second are set to point to tabFocusFirst.
    QGraphicsScenePrivate *sceneD = scene->d_func();
    if (!first) {
        sceneD->tabFocusFirst = second;
        return;
    }
    if (!second) {
        sceneD->tabFocusFirst = first->d_func()->focusNext;
        return;
    }

    // Both first and second are != 0.
    QGraphicsWidget *firstFocusNext = first->d_func()->focusNext;
    if (firstFocusNext == second) {
        // Nothing to do.
        return;
    }

    // Update the focus chain.
    QGraphicsWidget *secondFocusPrev = second->d_func()->focusPrev;
    QGraphicsWidget *secondFocusNext = second->d_func()->focusNext;
    firstFocusNext->d_func()->focusPrev = second;
    first->d_func()->focusNext = second;
    second->d_func()->focusNext = firstFocusNext;
    second->d_func()->focusPrev = first;
    secondFocusPrev->d_func()->focusNext = secondFocusNext;
    secondFocusNext->d_func()->focusPrev = secondFocusPrev;

    Q_ASSERT(first->d_func()->focusNext->d_func()->focusPrev == first);
    Q_ASSERT(first->d_func()->focusPrev->d_func()->focusNext == first);

    Q_ASSERT(second->d_func()->focusNext->d_func()->focusPrev == second);
    Q_ASSERT(second->d_func()->focusPrev->d_func()->focusNext == second);

}

/*!
    If \a on is true, this function enables \a attribute; otherwise
    \a attribute is disabled.

    See the class documentation for QGraphicsWidget for a complete list of
    which attributes are supported, and what they are for.

    \sa testAttribute(), QWidget::setAttribute()
*/
void QGraphicsWidget::setAttribute(Qt::WidgetAttribute attribute, bool on)
{
    Q_D(QGraphicsWidget);
    // ### most flags require some immediate action
    // ### we might want to qWarn use of unsupported attributes
    // ### we might want to not use Qt::WidgetAttribute, but roll our own instead
    d->setAttribute(attribute, on);
}

/*!
    Returns true if \a attribute is enabled for this widget; otherwise,
    returns false.

    \sa setAttribute()
*/
bool QGraphicsWidget::testAttribute(Qt::WidgetAttribute attribute) const
{
    Q_D(const QGraphicsWidget);
    return d->testAttribute(attribute);
}

/*!
    \reimp
*/
int QGraphicsWidget::type() const
{
    return Type;
}

/*!
    \reimp
*/
void QGraphicsWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    Q_UNUSED(painter);
    Q_UNUSED(option);
    Q_UNUSED(widget);
}

/*!
    This virtual function is called by QGraphicsScene to draw the window frame
    for windows using \a painter, \a option, and \a widget, in local
    coordinates. The base implementation uses the current style to render the
    frame and title bar.

    You can reimplement this function in a subclass of QGraphicsWidget to
    provide custom rendering of the widget's window frame.

    \sa QGraphicsItem::paint()
*/
void QGraphicsWidget::paintWindowFrame(QPainter *painter, const QStyleOptionGraphicsItem *option,
                                       QWidget *widget)
{
    const bool fillBackground = !testAttribute(Qt::WA_OpaquePaintEvent)
                                && !testAttribute(Qt::WA_NoSystemBackground);
    QGraphicsProxyWidget *proxy = qobject_cast<QGraphicsProxyWidget *>(this);
    const bool embeddedWidgetFillsOwnBackground = proxy && proxy->widget();

    if (rect().contains(option->exposedRect)) {
        if (fillBackground && !embeddedWidgetFillsOwnBackground)
            painter->fillRect(option->exposedRect, palette().window());
        return;
    }

    Q_D(QGraphicsWidget);

    QRect windowFrameRect = QRect(QPoint(), windowFrameGeometry().size().toSize());
    QStyleOptionTitleBar bar;
    bar.QStyleOption::operator=(*option);
    d->initStyleOptionTitleBar(&bar);   // this clear flags in bar.state
    if (d->buttonMouseOver)
        bar.state |= QStyle::State_MouseOver;
    else
        bar.state &= ~QStyle::State_MouseOver;
    if (d->buttonSunken)
        bar.state |= QStyle::State_Sunken;
    else
        bar.state &= ~QStyle::State_Sunken;

    bar.rect = windowFrameRect;

    // translate painter to make the style happy
    const QPointF styleOrigin = this->windowFrameRect().topLeft();
    painter->translate(styleOrigin);

#ifdef Q_WS_MAC
    const QSize pixmapSize = windowFrameRect.size();
    if (pixmapSize.width() <= 0 || pixmapSize.height() <= 0)
        return;
    QPainter *realPainter = painter;
    QPixmap pm(pixmapSize);
    painter = new QPainter(&pm);
#endif

    // Fill background
    QStyleHintReturnMask mask;
    bool setMask = style()->styleHint(QStyle::SH_WindowFrame_Mask, &bar, widget, &mask) && !mask.region.isEmpty();
    bool hasBorder = !style()->styleHint(QStyle::SH_TitleBar_NoBorder, &bar, widget);
    int frameWidth = style()->pixelMetric(QStyle::PM_MDIFrameWidth, &bar, widget);
    if (setMask) {
        painter->save();
        painter->setClipRegion(mask.region, Qt::IntersectClip);
    }
    if (fillBackground) {
        if (embeddedWidgetFillsOwnBackground) {
            // Don't fill the background twice.
            QPainterPath windowFrameBackground;
            windowFrameBackground.addRect(windowFrameRect);
            // Adjust with 0.5 to avoid border artifacts between
            // widget background and frame background.
            windowFrameBackground.addRect(rect().translated(-styleOrigin).adjusted(0.5, 0.5, -0.5, -0.5));
            painter->fillPath(windowFrameBackground, palette().window());
        } else {
            painter->fillRect(windowFrameRect, palette().window());
        }
    }
    painter->setRenderHint(QPainter::NonCosmeticDefaultPen);

    // Draw title
    int height = (int)d->titleBarHeight(bar);
    bar.rect.setHeight(height);
    if (hasBorder) // Frame is painted by PE_FrameWindow
        bar.rect.adjust(frameWidth, frameWidth, -frameWidth, 0);

    painter->save();
    painter->setFont(QApplication::font("QWorkspaceTitleBar"));
    style()->drawComplexControl(QStyle::CC_TitleBar, &bar, painter, widget);
    painter->restore();
    if (setMask)
        painter->restore();
    // Draw window frame
    QStyleOptionFrame frameOptions;
    frameOptions.QStyleOption::operator=(*option);
    initStyleOption(&frameOptions);
    if (!hasBorder)
        painter->setClipRect(windowFrameRect.adjusted(0, +height, 0, 0), Qt::IntersectClip);
    if (hasFocus()) {
        frameOptions.state |= QStyle::State_HasFocus;
    } else {
        frameOptions.state &= ~QStyle::State_HasFocus;
    }
    bool isActive = isActiveWindow();
    if (isActive) {
        frameOptions.state |= QStyle::State_Active;
    } else {
        frameOptions.state &= ~QStyle::State_Active;
    }

    frameOptions.palette.setCurrentColorGroup(isActive ? QPalette::Active : QPalette::Normal);
    frameOptions.rect = windowFrameRect;
    frameOptions.lineWidth = style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth, 0, widget);
    frameOptions.midLineWidth = 1;
    style()->drawPrimitive(QStyle::PE_FrameWindow, &frameOptions, painter, widget);

#ifdef Q_WS_MAC
    realPainter->drawPixmap(QPoint(), pm);
    delete painter;
#endif
}

/*!
    \reimp
*/
QRectF QGraphicsWidget::boundingRect() const
{
    return windowFrameRect();
}

/*!
    \reimp
*/
QPainterPath QGraphicsWidget::shape() const
{
    QPainterPath path;
    path.addRect(rect());
    return path;
}

/*!
    Call this function to close the widget.

    Returns true if the widget was closed; otherwise returns false.
    This slot will first send a QCloseEvent to the widget, which may or may
    not accept the event. If the event was ignored, nothing happens. If the
    event was accepted, it will hide() the widget.

    If the widget has the Qt::WA_DeleteOnClose attribute set it will be
    deleted.
*/
bool QGraphicsWidget::close()
{
    QCloseEvent closeEvent;
    QApplication::sendEvent(this, &closeEvent);
    if (!closeEvent.isAccepted()) {
        return false;
    }
    // hide
    if (isVisible()) {
        hide();
    }
    if (testAttribute(Qt::WA_DeleteOnClose)) {
        deleteLater();
    }
    return true;
}

#ifdef Q_NO_USING_KEYWORD
/*!
    \fn const QObjectList &QGraphicsWidget::children() const

    This function returns the same value as QObject::children(). It's
    provided to differentiate between the obsolete member
    QGraphicsItem::children() and QObject::children(). QGraphicsItem now
    provides childItems() instead.
*/
#endif

#if 0
void QGraphicsWidget::dumpFocusChain()
{
    qDebug() << "=========== Dumping focus chain ==============";
    int i = 0;
    QGraphicsWidget *next = this;
    QSet<QGraphicsWidget*> visited;
    do {
        if (!next) {
            qWarning("Found a focus chain that is not circular, (next == 0)");
            break;
        }
        qDebug() << i++ << QString::number(uint(next), 16) << next->className() << next->data(0) << QString::fromAscii("focusItem:%1").arg(next->hasFocus() ? "1" : "0") << QLatin1String("next:") << next->d_func()->focusNext->data(0) << QLatin1String("prev:") << next->d_func()->focusPrev->data(0);
        if (visited.contains(next)) {
            qWarning("Already visited this node. However, I expected to dump until I found myself.");
            break;
        }
        visited << next;
        next = next->d_func()->focusNext;
    } while (next != this);
}
#endif

QT_END_NAMESPACE
        
#endif //QT_NO_GRAPHICSVIEW