summaryrefslogtreecommitdiffstats
path: root/src/qml/qml/qqmlengine.cpp
blob: 8f225334722f2f71dc6c004ccc645a3ab0be6197 (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
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qqmlengine_p.h"
#include "qqmlengine.h"
#include "qqmlcomponentattached_p.h"

#include "qqmlcontext_p.h"
#include "qqmlcompiler_p.h"
#include "qqml.h"
#include "qqmlcontext.h"
#include "qqmlexpression.h"
#include "qqmlcomponent.h"
#include "qqmlvme_p.h"
#include "qqmlstringconverters_p.h"
#include "qqmlxmlhttprequest_p.h"
#include "qqmlscriptstring.h"
#include "qqmlglobal_p.h"
#include "qqmlcomponent_p.h"
#include "qqmlnetworkaccessmanagerfactory.h"
#include "qqmldirparser_p.h"
#include "qqmlextensioninterface.h"
#include "qqmllist_p.h"
#include "qqmltypenamecache_p.h"
#include "qqmlnotifier_p.h"
#include <private/qqmldebugconnector_p.h>
#include "qqmlincubator.h"
#include "qqmlabstracturlinterceptor.h"
#include <private/qqmlboundsignal_p.h>

#include <QtCore/qstandardpaths.h>
#include <QtCore/qsettings.h>

#include <QtCore/qmetaobject.h>
#include <QNetworkAccessManager>
#include <QDebug>
#include <QtCore/qcoreapplication.h>
#include <QtCore/qdir.h>
#include <QtCore/qmutex.h>
#include <QtCore/qthread.h>
#include <private/qthread_p.h>
#include <QtNetwork/qnetworkconfigmanager.h>

#include <private/qobject_p.h>
#include <private/qmetaobject_p.h>

#include <private/qqmllocale_p.h>

#include <private/qqmlbind_p.h>
#include <private/qqmlconnections_p.h>
#include <private/qqmltimer_p.h>
#include <private/qqmllistmodel_p.h>
#include <private/qqmlplatform_p.h>
#include <private/qquickpackage_p.h>
#include <private/qqmldelegatemodel_p.h>
#include <private/qqmlobjectmodel_p.h>
#include <private/qquickworkerscript_p.h>
#include <private/qqmlinstantiator_p.h>

#ifdef Q_OS_WIN // for %APPDATA%
#include <qt_windows.h>
#  if !defined(Q_OS_WINCE) && !defined(Q_OS_WINRT)
#    include <shlobj.h>
#  endif
#include <qlibrary.h>
#include <windows.h>

#ifndef CSIDL_APPDATA
#  define CSIDL_APPDATA           0x001a  // <username>\Application Data
#endif
#endif

Q_DECLARE_METATYPE(QQmlProperty)

QT_BEGIN_NAMESPACE

void qmlRegisterBaseTypes(const char *uri, int versionMajor, int versionMinor)
{
    QQmlEnginePrivate::registerBaseTypes(uri, versionMajor, versionMinor);
    QQmlEnginePrivate::registerQtQuick2Types(uri, versionMajor, versionMinor);
    QQmlValueTypeFactory::registerValueTypes(uri, versionMajor, versionMinor);
}

/*!
  \qmltype QtObject
    \instantiates QObject
  \inqmlmodule QtQml
  \ingroup qml-utility-elements
  \brief A basic QML type

  The QtObject type is a non-visual element which contains only the
  objectName property.

  It can be useful to create a QtObject if you need an extremely
  lightweight type to enclose a set of custom properties:

  \snippet qml/qtobject.qml 0

  It can also be useful for C++ integration, as it is just a plain
  QObject. See the QObject documentation for further details.
*/
/*!
  \qmlproperty string QtObject::objectName
  This property holds the QObject::objectName for this specific object instance.

  This allows a C++ application to locate an item within a QML component
  using the QObject::findChild() method. For example, the following C++
  application locates the child \l Rectangle item and dynamically changes its
  \c color value:

    \qml
    // MyRect.qml

    import QtQuick 2.0

    Item {
        width: 200; height: 200

        Rectangle {
            anchors.fill: parent
            color: "red"
            objectName: "myRect"
        }
    }
    \endqml

    \code
    // main.cpp

    QQuickView view;
    view.setSource(QUrl::fromLocalFile("MyRect.qml"));
    view.show();

    QQuickItem *item = view.rootObject()->findChild<QQuickItem*>("myRect");
    if (item)
        item->setProperty("color", QColor(Qt::yellow));
    \endcode
*/

bool QQmlEnginePrivate::qml_debugging_enabled = false;
bool QQmlEnginePrivate::s_designerMode = false;

// these types are part of the QML language
void QQmlEnginePrivate::registerBaseTypes(const char *uri, int versionMajor, int versionMinor)
{
    qmlRegisterType<QQmlComponent>(uri,versionMajor,versionMinor,"Component");
    qmlRegisterType<QObject>(uri,versionMajor,versionMinor,"QtObject");
    qmlRegisterType<QQmlBind>(uri, versionMajor, versionMinor,"Binding");
    qmlRegisterType<QQmlConnections>(uri, versionMajor, versionMinor,"Connections");
    qmlRegisterType<QQmlTimer>(uri, versionMajor, versionMinor,"Timer");
    qmlRegisterType<QQmlInstantiator>(uri, versionMajor, (versionMinor < 1 ? 1 : versionMinor), "Instantiator"); //Only available in >=2.1
    qmlRegisterCustomType<QQmlConnections>(uri, versionMajor, versionMinor,"Connections", new QQmlConnectionsParser);
    qmlRegisterType<QQmlInstanceModel>();
}


// These QtQuick types' implementation resides in the QtQml module
void QQmlEnginePrivate::registerQtQuick2Types(const char *uri, int versionMajor, int versionMinor)
{
    qmlRegisterType<QQmlListElement>(uri, versionMajor, versionMinor, "ListElement"); // Now in QtQml.Models, here for compatibility
    qmlRegisterCustomType<QQmlListModel>(uri, versionMajor, versionMinor, "ListModel", new QQmlListModelParser); // Now in QtQml.Models, here for compatibility
    qmlRegisterType<QQuickWorkerScript>(uri, versionMajor, versionMinor, "WorkerScript");
    qmlRegisterType<QQuickPackage>(uri, versionMajor, versionMinor, "Package");
    qmlRegisterType<QQmlDelegateModel>(uri, versionMajor, versionMinor, "VisualDataModel");
    qmlRegisterType<QQmlDelegateModelGroup>(uri, versionMajor, versionMinor, "VisualDataGroup");
    qmlRegisterType<QQmlObjectModel>(uri, versionMajor, versionMinor, "VisualItemModel");
}

void QQmlEnginePrivate::defineQtQuick2Module()
{
    // register the base types into the QtQuick namespace
    registerBaseTypes("QtQuick",2,0);

    // register the QtQuick2 types which are implemented in the QtQml module.
    registerQtQuick2Types("QtQuick",2,0);
    qmlRegisterUncreatableType<QQmlLocale>("QtQuick", 2, 0, "Locale", QQmlEngine::tr("Locale cannot be instantiated.  Use Qt.locale()"));
}

bool QQmlEnginePrivate::designerMode()
{
    return s_designerMode;
}

void QQmlEnginePrivate::activateDesignerMode()
{
    s_designerMode = true;
}


/*!
    \class QQmlImageProviderBase
    \brief The QQmlImageProviderBase class is used to register image providers in the QML engine.
    \inmodule QtQml

    Image providers must be registered with the QML engine.  The only information the QML
    engine knows about image providers is the type of image data they provide.  To use an
    image provider to acquire image data, you must cast the QQmlImageProviderBase pointer
    to a QQuickImageProvider pointer.

    \sa QQuickImageProvider, QQuickTextureFactory
*/

/*!
    \enum QQmlImageProviderBase::ImageType

    Defines the type of image supported by this image provider.

    \value Image The Image Provider provides QImage images.
        The QQuickImageProvider::requestImage() method will be called for all image requests.
    \value Pixmap The Image Provider provides QPixmap images.
        The QQuickImageProvider::requestPixmap() method will be called for all image requests.
    \value Texture The Image Provider provides QSGTextureProvider based images.
        The QQuickImageProvider::requestTexture() method will be called for all image requests.
    \value ImageResponse The Image provider provides QQuickTextureFactory based images.
        Should only be used in QQuickAsyncImageProvider or its subclasses.
        The QQuickAsyncImageProvider::requestImageResponse() method will be called for all image requests.
        Since Qt 5.6
    \omitvalue Invalid
*/

/*!
    \enum QQmlImageProviderBase::Flag

    Defines specific requirements or features of this image provider.

    \value ForceAsynchronousImageLoading Ensures that image requests to the provider are
        run in a separate thread, which allows the provider to spend as much time as needed
        on producing the image without blocking the main thread.
*/

/*!
    \fn QQmlImageProviderBase::imageType() const

    Implement this method to return the image type supported by this image provider.
*/

/*!
    \fn QQmlImageProviderBase::flags() const

    Implement this to return the properties of this image provider.
*/

/*! \internal */
QQmlImageProviderBase::QQmlImageProviderBase()
{
}

/*! \internal */
QQmlImageProviderBase::~QQmlImageProviderBase()
{
}


/*!
\qmltype Qt
\inqmlmodule QtQml
\instantiates QQmlEnginePrivate
\ingroup qml-utility-elements
\keyword QmlGlobalQtObject
\brief Provides a global object with useful enums and functions from Qt.

The \c Qt object is a global object with utility functions, properties and enums.

It is not instantiable; to use it, call the members of the global \c Qt object directly.
For example:

\qml
import QtQuick 2.0

Text {
    color: Qt.rgba(1, 0, 0, 1)
    text: Qt.md5("hello, world")
}
\endqml


\section1 Enums

The Qt object contains the enums available in the \l [QtCore]{Qt}{Qt Namespace}. For example, you can access
the \l Qt::LeftButton and \l Qt::RightButton enumeration values as \c Qt.LeftButton and \c Qt.RightButton.


\section1 Types

The Qt object also contains helper functions for creating objects of specific
data types. This is primarily useful when setting the properties of an item
when the property has one of the following types:
\list
\li \c rect - use \l{Qt::rect()}{Qt.rect()}
\li \c point - use \l{Qt::point()}{Qt.point()}
\li \c size - use \l{Qt::size()}{Qt.size()}
\endlist

If the \c QtQuick module has been imported, the following helper functions for
creating objects of specific data types are also available for clients to use:
\list
\li \c color - use \l{Qt::rgba()}{Qt.rgba()}, \l{Qt::hsla()}{Qt.hsla()}, \l{Qt::darker()}{Qt.darker()}, \l{Qt::lighter()}{Qt.lighter()} or \l{Qt::tint()}{Qt.tint()}
\li \c font - use \l{Qt::font()}{Qt.font()}
\li \c vector2d - use \l{Qt::vector2d()}{Qt.vector2d()}
\li \c vector3d - use \l{Qt::vector3d()}{Qt.vector3d()}
\li \c vector4d - use \l{Qt::vector4d()}{Qt.vector4d()}
\li \c quaternion - use \l{Qt::quaternion()}{Qt.quaternion()}
\li \c matrix4x4 - use \l{Qt::matrix4x4()}{Qt.matrix4x4()}
\endlist

There are also string based constructors for these types. See \l{qtqml-typesystem-basictypes.html}{QML Basic Types} for more information.

\section1 Date/Time Formatters

The Qt object contains several functions for formatting QDateTime, QDate and QTime values.

\list
    \li \l{Qt::formatDateTime}{string Qt.formatDateTime(datetime date, variant format)}
    \li \l{Qt::formatDate}{string Qt.formatDate(datetime date, variant format)}
    \li \l{Qt::formatTime}{string Qt.formatTime(datetime date, variant format)}
\endlist

The format specification is described at \l{Qt::formatDateTime}{Qt.formatDateTime}.


\section1 Dynamic Object Creation
The following functions on the global object allow you to dynamically create QML
items from files or strings. See \l{Dynamic QML Object Creation from JavaScript} for an overview
of their use.

\list
    \li \l{Qt::createComponent()}{object Qt.createComponent(url)}
    \li \l{Qt::createQmlObject()}{object Qt.createQmlObject(string qml, object parent, string filepath)}
\endlist


\section1 Other Functions

The following functions are also on the Qt object.

\list
    \li \l{Qt::quit()}{Qt.quit()}
    \li \l{Qt::md5()}{Qt.md5(string)}
    \li \l{Qt::btoa()}{string Qt.btoa(string)}
    \li \l{Qt::atob()}{string Qt.atob(string)}
    \li \l{Qt::binding()}{object Qt.binding(function)}
    \li \l{Qt::locale()}{object Qt.locale()}
    \li \l{Qt::resolvedUrl()}{string Qt.resolvedUrl(string)}
    \li \l{Qt::openUrlExternally()}{Qt.openUrlExternally(string)}
    \li \l{Qt::fontFamilies()}{list<string> Qt.fontFamilies()}
\endlist
*/

/*!
    \qmlproperty object Qt::platform
    \since 5.1

    The \c platform object provides info about the underlying platform.

    Its properties are:

    \table
    \row
    \li \c platform.os
    \li

    This read-only property contains the name of the operating system.

    Possible values are:

    \list
        \li \c "android" - Android
        \li \c "blackberry" - BlackBerry OS
        \li \c "ios" - iOS
        \li \c "linux" - Linux
        \li \c "osx" - \macos
        \li \c "unix" - Other Unix-based OS
        \li \c "windows" - Windows
        \li \c "wince" - Windows CE
        \li \c "winrt" - Windows Runtime
        \li \c "winphone" - Windows Phone
    \endlist
    \endtable
*/

/*!
    \qmlproperty object Qt::application
    \since 5.1

    The \c application object provides access to global application state
    properties shared by many QML components.

    Its properties are:

    \table
    \row
    \li \c application.active
    \li
    Deprecated, use Qt.application.state == Qt.ApplicationActive instead.

    \row
    \li \c application.state
    \li
    This read-only property indicates the current state of the application.

    Possible values are:

    \list
    \li Qt.ApplicationActive - The application is the top-most and focused application, and the
                               user is able to interact with the application.
    \li Qt.ApplicationInactive - The application is visible or partially visible, but not selected
                                 to be in front, the user cannot interact with the application.
                                 On desktop platforms, this typically means that the user activated
                                 another application. On mobile platforms, it is more common to
                                 enter this state when the OS is interrupting the user with for
                                 example incoming calls, SMS-messages or dialogs. This is usually a
                                 transient state during which the application is paused. The user
                                 may return focus to your application, but most of the time it will
                                 be the first indication that the application is going to be suspended.
                                 While in this state, consider pausing or stopping any activity that
                                 should not continue when the user cannot interact with your
                                 application, such as a video, a game, animations, or sensors.
                                 You should also avoid performing CPU-intensive tasks which might
                                 slow down the application in front.
    \li Qt.ApplicationSuspended - The application is suspended and not visible to the user. On
                                  mobile platforms, the application typically enters this state when
                                  the user returns to the home screen or switches to another
                                  application. While in this state, the application should ensure
                                  that the user perceives it as always alive and does not lose his
                                  progress, saving any persistent data. The application should cease
                                  all activities and be prepared for code execution to stop. While
                                  suspended, the application can be killed at any time without
                                  further warnings (for example when low memory forces the OS to purge
                                  suspended applications).
    \li Qt.ApplicationHidden - The application is hidden and runs in the background. This is the
                               normal state for applications that need to do background processing,
                               like playing music, while the user interacts with other applications.
                               The application should free up all graphical resources when entering
                               this state. A Qt Quick application should not usually handle this state
                               at the QML level. Instead, you should unload the entire UI and reload
                               the QML files whenever the application becomes active again.
    \endlist

    \row
    \li \c application.layoutDirection
    \li
    This read-only property can be used to query the default layout direction of the
    application. On system start-up, the default layout direction depends on the
    application's language. The property has a value of \c Qt.RightToLeft in locales
    where text and graphic elements are read from right to left, and \c Qt.LeftToRight
    where the reading direction flows from left to right. You can bind to this
    property to customize your application layouts to support both layout directions.

    Possible values are:

    \list
    \li Qt.LeftToRight - Text and graphics elements should be positioned
                        from left to right.
    \li Qt.RightToLeft - Text and graphics elements should be positioned
                        from right to left.
    \endlist
    \row
    \li \c application.arguments
    \li This is a string list of the arguments the executable was invoked with.
    \row
    \li \c application.name
    \li This is the application name set on the QCoreApplication instance. This property can be written
    to in order to set the application name.
    \row
    \li \c application.version
    \li This is the application version set on the QCoreApplication instance. This property can be written
    to in order to set the application version.
    \row
    \li \c application.organization
    \li This is the organization name set on the QCoreApplication instance. This property can be written
    to in order to set the organization name.
    \row
    \li \c application.domain
    \li This is the organization domain set on the QCoreApplication instance. This property can be written
    to in order to set the organization domain.

    \row
    \li \c application.supportsMultipleWindows
    \li This read-only property can be used to determine whether or not the
        platform supports multiple windows. Some embedded platforms do not support
        multiple windows, for example.
    \endtable

    The object also has one signal, aboutToQuit(), which is the same as \l QCoreApplication::aboutToQuit().

    The following example uses the \c application object to indicate
    whether the application is currently active:

    \snippet qml/application.qml document

    Note that when using QML without a QGuiApplication, the following properties will be undefined:
    \list
    \li application.active
    \li application.state
    \li application.layoutDirection
    \endlist
*/

/*!
    \qmlproperty object Qt::inputMethod
    \since 5.0

    The \c inputMethod object allows access to application's QInputMethod object
    and all its properties and slots. See the QInputMethod documentation for
    further details.
*/

/*!
    \qmlproperty object Qt::styleHints
    \since 5.5

    The \c styleHints object provides platform-specific style hints and settings.
    See the QStyleHints documentation for further details.

    \note The \c styleHints object is only available when using the Qt Quick module.

    The following example uses the \c styleHints object to determine whether an
    item should gain focus on mouse press or touch release:
    \code
    import QtQuick 2.4

    MouseArea {
        id: button

        onPressed: {
            if (!Qt.styleHints.setFocusOnTouchRelease)
                button.forceActiveFocus()
        }
        onReleased: {
            if (Qt.styleHints.setFocusOnTouchRelease)
                button.forceActiveFocus()
        }
    }
    \endcode
*/

/*!
\qmlmethod object Qt::include(string url, jsobject callback)

Includes another JavaScript file. This method can only be used from within JavaScript files,
and not regular QML files.

This imports all functions from \a url into the current script's namespace.

Qt.include() returns an object that describes the status of the operation.  The object has
a single property, \c {status}, that is set to one of the following values:

\table
\header \li Symbol \li Value \li Description
\row \li result.OK \li 0 \li The include completed successfully.
\row \li result.LOADING \li 1 \li Data is being loaded from the network.
\row \li result.NETWORK_ERROR \li 2 \li A network error occurred while fetching the url.
\row \li result.EXCEPTION \li 3 \li A JavaScript exception occurred while executing the included code.
An additional \c exception property will be set in this case.
\endtable

The \c status property will be updated as the operation progresses.

If provided, \a callback is invoked when the operation completes.  The callback is passed
the same object as is returned from the Qt.include() call.
*/
// Qt.include() is implemented in qv4include.cpp

QQmlEnginePrivate::QQmlEnginePrivate(QQmlEngine *e)
: propertyCapture(0), rootContext(0),
  profiler(0), outputWarningsToMsgLog(true),
  cleanup(0), erroredBindings(0), inProgressCreations(0),
  workerScriptEngine(0),
  activeObjectCreator(0),
  networkAccessManager(0), networkAccessManagerFactory(0), urlInterceptor(0),
  scarceResourcesRefCount(0), importDatabase(e), typeLoader(e),
  uniqueId(1), incubatorCount(0), incubationController(0)
{
}

QQmlEnginePrivate::~QQmlEnginePrivate()
{
    typedef QHash<QPair<QQmlType *, int>, QQmlPropertyCache *>::const_iterator TypePropertyCacheIt;
    typedef QHash<int, QQmlCompiledData *>::const_iterator CompositeTypesIt;

    if (inProgressCreations)
        qWarning() << QQmlEngine::tr("There are still \"%1\" items in the process of being created at engine destruction.").arg(inProgressCreations);

    while (cleanup) {
        QQmlCleanup *c = cleanup;
        cleanup = c->next;
        if (cleanup) cleanup->prev = &cleanup;
        c->next = 0;
        c->prev = 0;
        c->clear();
    }

    doDeleteInEngineThread();

    if (incubationController) incubationController->d = 0;
    incubationController = 0;

    for (TypePropertyCacheIt iter = typePropertyCache.cbegin(), end = typePropertyCache.cend(); iter != end; ++iter)
        (*iter)->release();
    for (CompositeTypesIt iter = m_compositeTypes.cbegin(), end = m_compositeTypes.cend(); iter != end; ++iter) {
        iter.value()->isRegisteredWithEngine = false;

        // since unregisterInternalCompositeType() will not be called in this
        // case, we have to clean up the type registration manually
        QMetaType::unregisterType(iter.value()->metaTypeId);
        QMetaType::unregisterType(iter.value()->listMetaTypeId);
    }
    delete profiler;
}

void QQmlEnginePrivate::enableProfiler()
{
    profiler = new QQmlProfiler();
}

void QQmlPrivate::qdeclarativeelement_destructor(QObject *o)
{
    QObjectPrivate *p = QObjectPrivate::get(o);
    if (p->declarativeData) {
        QQmlData *d = static_cast<QQmlData*>(p->declarativeData);
        if (d->ownContext && d->context) {
            d->context->destroy();
            d->context = 0;
        }

        // Mark this object as in the process of deletion to
        // prevent it resolving in bindings
        QQmlData::markAsDeleted(o);

        // Disconnect the notifiers now - during object destruction this would be too late, since
        // the disconnect call wouldn't be able to call disconnectNotify(), as it isn't possible to
        // get the metaobject anymore.
        d->disconnectNotifiers();
    }
}

QQmlData::QQmlData()
    : ownedByQml1(false), ownMemory(true), ownContext(false), indestructible(true), explicitIndestructibleSet(false),
      hasTaintedV4Object(false), isQueuedForDeletion(false), rootObjectInCreation(false),
      hasInterceptorMetaObject(false), hasVMEMetaObject(false), parentFrozen(false), bindingBitsSize(0), bindingBits(0), notifyList(0), context(0), outerContext(0),
      bindings(0), signalHandlers(0), nextContextObject(0), prevContextObject(0),
      lineNumber(0), columnNumber(0), jsEngineId(0), compiledData(0), deferredData(0),
      propertyCache(0), guards(0), extendedData(0)
{
    init();
}

void QQmlData::destroyed(QAbstractDeclarativeData *d, QObject *o)
{
    QQmlData *ddata = static_cast<QQmlData *>(d);
    if (ddata->ownedByQml1)
        return;
    ddata->destroyed(o);
}

void QQmlData::parentChanged(QAbstractDeclarativeData *d, QObject *o, QObject *p)
{
    QQmlData *ddata = static_cast<QQmlData *>(d);
    if (ddata->ownedByQml1)
        return;
    ddata->parentChanged(o, p);
}

class QQmlThreadNotifierProxyObject : public QObject
{
public:
    QPointer<QObject> target;

    virtual int qt_metacall(QMetaObject::Call, int methodIndex, void **a) {
        if (!target)
            return -1;

        QMetaMethod method = target->metaObject()->method(methodIndex);
        Q_ASSERT(method.methodType() == QMetaMethod::Signal);
        int signalIndex = QMetaObjectPrivate::signalIndex(method);
        QQmlData *ddata = QQmlData::get(target, false);
        QQmlNotifierEndpoint *ep = ddata->notify(signalIndex);
        if (ep) QQmlNotifier::emitNotify(ep, a);

        delete this;

        return -1;
    }
};

void QQmlData::signalEmitted(QAbstractDeclarativeData *, QObject *object, int index, void **a)
{
    QQmlData *ddata = QQmlData::get(object, false);
    if (!ddata) return; // Probably being deleted
    if (ddata->ownedByQml1) return;

    // In general, QML only supports QObject's that live on the same thread as the QQmlEngine
    // that they're exposed to.  However, to make writing "worker objects" that calculate data
    // in a separate thread easier, QML allows a QObject that lives in the same thread as the
    // QQmlEngine to emit signals from a different thread.  These signals are then automatically
    // marshalled back onto the QObject's thread and handled by QML from there.  This is tested
    // by the qqmlecmascript::threadSignal() autotest.
    if (ddata->notifyList &&
        QThread::currentThreadId() != QObjectPrivate::get(object)->threadData->threadId) {

        if (!QObjectPrivate::get(object)->threadData->thread)
            return;

        QMetaMethod m = QMetaObjectPrivate::signal(object->metaObject(), index);
        QList<QByteArray> parameterTypes = m.parameterTypes();

        int *types = (int *)malloc((parameterTypes.count() + 1) * sizeof(int));
        void **args = (void **) malloc((parameterTypes.count() + 1) *sizeof(void *));

        types[0] = 0; // return type
        args[0] = 0; // return value

        for (int ii = 0; ii < parameterTypes.count(); ++ii) {
            const QByteArray &typeName = parameterTypes.at(ii);
            if (typeName.endsWith('*'))
                types[ii + 1] = QMetaType::VoidStar;
            else
                types[ii + 1] = QMetaType::type(typeName);

            if (!types[ii + 1]) {
                qWarning("QObject::connect: Cannot queue arguments of type '%s'\n"
                         "(Make sure '%s' is registered using qRegisterMetaType().)",
                         typeName.constData(), typeName.constData());
                free(types);
                free(args);
                return;
            }

            args[ii + 1] = QMetaType::create(types[ii + 1], a[ii + 1]);
        }

        QMetaCallEvent *ev = new QMetaCallEvent(m.methodIndex(), 0, 0, object, index,
                                                parameterTypes.count() + 1, types, args);

        QQmlThreadNotifierProxyObject *mpo = new QQmlThreadNotifierProxyObject;
        mpo->target = object;
        mpo->moveToThread(QObjectPrivate::get(object)->threadData->thread);
        QCoreApplication::postEvent(mpo, ev);

    } else {
        QQmlNotifierEndpoint *ep = ddata->notify(index);
        if (ep) QQmlNotifier::emitNotify(ep, a);
    }
}

int QQmlData::receivers(QAbstractDeclarativeData *d, const QObject *, int index)
{
    QQmlData *ddata = static_cast<QQmlData *>(d);
    if (ddata->ownedByQml1)
        return 0;
    return ddata->endpointCount(index);
}

bool QQmlData::isSignalConnected(QAbstractDeclarativeData *d, const QObject *, int index)
{
    QQmlData *ddata = static_cast<QQmlData *>(d);
    if (ddata->ownedByQml1)
        return false;
    return ddata->signalHasEndpoint(index);
}

int QQmlData::endpointCount(int index)
{
    int count = 0;
    QQmlNotifierEndpoint *ep = notify(index);
    if (!ep)
        return count;
    ++count;
    while (ep->next) {
        ++count;
        ep = ep->next;
    }
    return count;
}

void QQmlData::markAsDeleted(QObject *o)
{
    QQmlData::setQueuedForDeletion(o);

    QObjectPrivate *p = QObjectPrivate::get(o);
    for (QList<QObject *>::const_iterator it = p->children.constBegin(), end = p->children.constEnd(); it != end; ++it) {
        QQmlData::markAsDeleted(*it);
    }
}

void QQmlData::setQueuedForDeletion(QObject *object)
{
    if (object) {
        if (QObjectPrivate *priv = QObjectPrivate::get(object)) {
            if (!priv->wasDeleted && priv->declarativeData) {
                QQmlData *ddata = QQmlData::get(object, false);
                if (ddata->ownContext && ddata->context)
                    ddata->context->emitDestruction();
                ddata->isQueuedForDeletion = true;
            }
        }
    }
}

void QQmlData::flushPendingBindingImpl(int coreIndex)
{
    clearPendingBindingBit(coreIndex);

    // Find the binding
    QQmlAbstractBinding *b = bindings;
    while (b && b->targetPropertyIndex() != coreIndex)
        b = b->nextBinding();

    if (b && b->targetPropertyIndex() == coreIndex)
        b->setEnabled(true, QQmlPropertyPrivate::BypassInterceptor |
                            QQmlPropertyPrivate::DontRemoveBinding);
}

bool QQmlEnginePrivate::baseModulesUninitialized = true;
void QQmlEnginePrivate::init()
{
    Q_Q(QQmlEngine);

    if (baseModulesUninitialized) {
        qmlRegisterType<QQmlComponent>("QML", 1, 0, "Component"); // required for the Compiler.
        registerBaseTypes("QtQml", 2, 0); // import which provides language building blocks.
        qmlRegisterUncreatableType<QQmlLocale>("QtQml", 2, 2, "Locale", QQmlEngine::tr("Locale cannot be instantiated.  Use Qt.locale()"));

        QQmlData::init();
        baseModulesUninitialized = false;
    }

    qRegisterMetaType<QVariant>();
    qRegisterMetaType<QQmlScriptString>();
    qRegisterMetaType<QJSValue>();
    qRegisterMetaType<QQmlComponent::Status>();
    qRegisterMetaType<QList<QObject*> >();
    qRegisterMetaType<QList<int> >();
    qRegisterMetaType<QQmlV4Handle>();
    qRegisterMetaType<QQmlBinding*>();

    v8engine()->setEngine(q);

    rootContext = new QQmlContext(q,true);

    if (QCoreApplication::instance()->thread() == q->thread() && QQmlDebugConnector::instance()) {
        QQmlDebugConnector::instance()->open();
        QQmlDebugConnector::instance()->addEngine(q);
    }
}

QQuickWorkerScriptEngine *QQmlEnginePrivate::getWorkerScriptEngine()
{
    Q_Q(QQmlEngine);
    if (!workerScriptEngine)
        workerScriptEngine = new QQuickWorkerScriptEngine(q);
    return workerScriptEngine;
}

/*!
  \class QQmlEngine
  \since 5.0
  \inmodule QtQml
  \brief The QQmlEngine class provides an environment for instantiating QML components.

  Each QML component is instantiated in a QQmlContext.
  QQmlContext's are essential for passing data to QML
  components.  In QML, contexts are arranged hierarchically and this
  hierarchy is managed by the QQmlEngine.

  Prior to creating any QML components, an application must have
  created a QQmlEngine to gain access to a QML context.  The
  following example shows how to create a simple Text item.

  \code
  QQmlEngine engine;
  QQmlComponent component(&engine);
  component.setData("import QtQuick 2.0\nText { text: \"Hello world!\" }", QUrl());
  QQuickItem *item = qobject_cast<QQuickItem *>(component.create());

  //add item to view, etc
  ...
  \endcode

  In this case, the Text item will be created in the engine's
  \l {QQmlEngine::rootContext()}{root context}.

  Note that the \l {Qt Quick 1} version is called QDeclarativeEngine.

  \sa QQmlComponent, QQmlContext, {QML Global Object}
*/

/*!
  Create a new QQmlEngine with the given \a parent.
*/
QQmlEngine::QQmlEngine(QObject *parent)
: QJSEngine(*new QQmlEnginePrivate(this), parent)
{
    Q_D(QQmlEngine);
    d->init();
}

/*!
* \internal
*/
QQmlEngine::QQmlEngine(QQmlEnginePrivate &dd, QObject *parent)
: QJSEngine(dd, parent)
{
    Q_D(QQmlEngine);
    d->init();
}

/*!
  Destroys the QQmlEngine.

  Any QQmlContext's created on this engine will be
  invalidated, but not destroyed (unless they are parented to the
  QQmlEngine object).

  See QJSEngine docs for details on cleaning up the JS engine.
*/
QQmlEngine::~QQmlEngine()
{
    Q_D(QQmlEngine);
    QQmlDebugConnector *server = QQmlDebugConnector::instance();
    if (server)
        server->removeEngine(this);

    d->typeLoader.invalidate();

    // Emit onDestruction signals for the root context before
    // we destroy the contexts, engine, Singleton Types etc. that
    // may be required to handle the destruction signal.
    QQmlContextData::get(rootContext())->emitDestruction();

    // clean up all singleton type instances which we own.
    // we do this here and not in the private dtor since otherwise a crash can
    // occur (if we are the QObject parent of the QObject singleton instance)
    // XXX TODO: performance -- store list of singleton types separately?
    QList<QQmlType*> singletonTypes = QQmlMetaType::qmlSingletonTypes();
    foreach (QQmlType *currType, singletonTypes)
        currType->singletonInstanceInfo()->destroy(this);

    delete d->rootContext;
    d->rootContext = 0;
}

/*! \fn void QQmlEngine::quit()
    This signal is emitted when the QML loaded by the engine would like to quit.
 */

/*! \fn void QQmlEngine::warnings(const QList<QQmlError> &warnings)
    This signal is emitted when \a warnings messages are generated by QML.
 */

/*!
  Clears the engine's internal component cache.

  This function causes the property metadata of all components previously
  loaded by the engine to be destroyed.  All previously loaded components and
  the property bindings for all extant objects created from those components will
  cease to function.

  This function returns the engine to a state where it does not contain any loaded
  component data.  This may be useful in order to reload a smaller subset of the
  previous component set, or to load a new version of a previously loaded component.

  Once the component cache has been cleared, components must be loaded before
  any new objects can be created.

  \sa trimComponentCache()
 */
void QQmlEngine::clearComponentCache()
{
    Q_D(QQmlEngine);
    d->typeLoader.clearCache();
}

/*!
  Trims the engine's internal component cache.

  This function causes the property metadata of any loaded components which are
  not currently in use to be destroyed.

  A component is considered to be in use if there are any extant instances of
  the component itself, any instances of other components that use the component,
  or any objects instantiated by any of those components.

  \sa clearComponentCache()
 */
void QQmlEngine::trimComponentCache()
{
    Q_D(QQmlEngine);
    d->typeLoader.trimCache();
}

/*!
  Returns the engine's root context.

  The root context is automatically created by the QQmlEngine.
  Data that should be available to all QML component instances
  instantiated by the engine should be put in the root context.

  Additional data that should only be available to a subset of
  component instances should be added to sub-contexts parented to the
  root context.
*/
QQmlContext *QQmlEngine::rootContext() const
{
    Q_D(const QQmlEngine);
    return d->rootContext;
}

/*!
  \internal
  This API is private for 5.1

  Sets the \a urlInterceptor to be used when resolving URLs in QML.
  This also applies to URLs used for loading script files and QML types.
  This should not be modifed while the engine is loading files, or URL
  selection may be inconsistent.
*/
void QQmlEngine::setUrlInterceptor(QQmlAbstractUrlInterceptor *urlInterceptor)
{
    Q_D(QQmlEngine);
    d->urlInterceptor = urlInterceptor;
}

/*!
  \internal
  This API is private for 5.1

  Returns the current QQmlAbstractUrlInterceptor. It must not be modified outside
  the GUI thread.
*/
QQmlAbstractUrlInterceptor *QQmlEngine::urlInterceptor() const
{
    Q_D(const QQmlEngine);
    return d->urlInterceptor;
}


/*!
  Sets the \a factory to use for creating QNetworkAccessManager(s).

  QNetworkAccessManager is used for all network access by QML.  By
  implementing a factory it is possible to create custom
  QNetworkAccessManager with specialized caching, proxy and cookie
  support.

  The factory must be set before executing the engine.
*/
void QQmlEngine::setNetworkAccessManagerFactory(QQmlNetworkAccessManagerFactory *factory)
{
    Q_D(QQmlEngine);
    QMutexLocker locker(&d->networkAccessManagerMutex);
    d->networkAccessManagerFactory = factory;
}

/*!
  Returns the current QQmlNetworkAccessManagerFactory.

  \sa setNetworkAccessManagerFactory()
*/
QQmlNetworkAccessManagerFactory *QQmlEngine::networkAccessManagerFactory() const
{
    Q_D(const QQmlEngine);
    return d->networkAccessManagerFactory;
}

void QQmlEnginePrivate::registerFinalizeCallback(QObject *obj, int index)
{
    if (activeObjectCreator) {
        activeObjectCreator->finalizeCallbacks()->append(qMakePair(QPointer<QObject>(obj), index));
    } else {
        void *args[] = { 0 };
        QMetaObject::metacall(obj, QMetaObject::InvokeMetaMethod, index, args);
    }
}

QNetworkAccessManager *QQmlEnginePrivate::createNetworkAccessManager(QObject *parent) const
{
    QMutexLocker locker(&networkAccessManagerMutex);
    QNetworkAccessManager *nam;
    if (networkAccessManagerFactory) {
        nam = networkAccessManagerFactory->create(parent);
    } else {
        nam = new QNetworkAccessManager(parent);
    }

    return nam;
}

QNetworkAccessManager *QQmlEnginePrivate::getNetworkAccessManager() const
{
    Q_Q(const QQmlEngine);
    if (!networkAccessManager)
        networkAccessManager = createNetworkAccessManager(const_cast<QQmlEngine*>(q));
    return networkAccessManager;
}

/*!
  Returns a common QNetworkAccessManager which can be used by any QML
  type instantiated by this engine.

  If a QQmlNetworkAccessManagerFactory has been set and a
  QNetworkAccessManager has not yet been created, the
  QQmlNetworkAccessManagerFactory will be used to create the
  QNetworkAccessManager; otherwise the returned QNetworkAccessManager
  will have no proxy or cache set.

  \sa setNetworkAccessManagerFactory()
*/
QNetworkAccessManager *QQmlEngine::networkAccessManager() const
{
    Q_D(const QQmlEngine);
    return d->getNetworkAccessManager();
}

/*!

  Sets the \a provider to use for images requested via the \e
  image: url scheme, with host \a providerId. The QQmlEngine
  takes ownership of \a provider.

  Image providers enable support for pixmap and threaded image
  requests. See the QQuickImageProvider documentation for details on
  implementing and using image providers.

  All required image providers should be added to the engine before any
  QML sources files are loaded.

  \sa removeImageProvider(), QQuickImageProvider, QQmlImageProviderBase
*/
void QQmlEngine::addImageProvider(const QString &providerId, QQmlImageProviderBase *provider)
{
    Q_D(QQmlEngine);
    QMutexLocker locker(&d->mutex);
    d->imageProviders.insert(providerId.toLower(), QSharedPointer<QQmlImageProviderBase>(provider));
}

/*!
  Returns the image provider set for \a providerId.

  Returns the provider if it was found; otherwise returns 0.

  \sa QQuickImageProvider
*/
QQmlImageProviderBase *QQmlEngine::imageProvider(const QString &providerId) const
{
    Q_D(const QQmlEngine);
    QMutexLocker locker(&d->mutex);
    return d->imageProviders.value(providerId.toLower()).data();
}

/*!
  Removes the image provider for \a providerId.

  \sa addImageProvider(), QQuickImageProvider
*/
void QQmlEngine::removeImageProvider(const QString &providerId)
{
    Q_D(QQmlEngine);
    QMutexLocker locker(&d->mutex);
    d->imageProviders.take(providerId.toLower());
}

/*!
  Return the base URL for this engine.  The base URL is only used to
  resolve components when a relative URL is passed to the
  QQmlComponent constructor.

  If a base URL has not been explicitly set, this method returns the
  application's current working directory.

  \sa setBaseUrl()
*/
QUrl QQmlEngine::baseUrl() const
{
    Q_D(const QQmlEngine);
    if (d->baseUrl.isEmpty()) {
        return QUrl::fromLocalFile(QDir::currentPath() + QDir::separator());
    } else {
        return d->baseUrl;
    }
}

/*!
  Set the  base URL for this engine to \a url.

  \sa baseUrl()
*/
void QQmlEngine::setBaseUrl(const QUrl &url)
{
    Q_D(QQmlEngine);
    d->baseUrl = url;
}

/*!
  Returns true if warning messages will be output to stderr in addition
  to being emitted by the warnings() signal, otherwise false.

  The default value is true.
*/
bool QQmlEngine::outputWarningsToStandardError() const
{
    Q_D(const QQmlEngine);
    return d->outputWarningsToMsgLog;
}

/*!
  Set whether warning messages will be output to stderr to \a enabled.

  If \a enabled is true, any warning messages generated by QML will be
  output to stderr and emitted by the warnings() signal.  If \a enabled
  is false, only the warnings() signal will be emitted.  This allows
  applications to handle warning output themselves.

  The default value is true.
*/
void QQmlEngine::setOutputWarningsToStandardError(bool enabled)
{
    Q_D(QQmlEngine);
    d->outputWarningsToMsgLog = enabled;
}

/*!
  Returns the QQmlContext for the \a object, or 0 if no
  context has been set.

  When the QQmlEngine instantiates a QObject, the context is
  set automatically.

  \sa qmlContext(), qmlEngine()
  */
QQmlContext *QQmlEngine::contextForObject(const QObject *object)
{
    if(!object)
        return 0;

    QObjectPrivate *priv = QObjectPrivate::get(const_cast<QObject *>(object));

    QQmlData *data =
        static_cast<QQmlData *>(priv->declarativeData);

    if (!data)
        return 0;
    else if (data->outerContext)
        return data->outerContext->asQQmlContext();
    else
        return 0;
}

/*!
  Sets the QQmlContext for the \a object to \a context.
  If the \a object already has a context, a warning is
  output, but the context is not changed.

  When the QQmlEngine instantiates a QObject, the context is
  set automatically.
 */
void QQmlEngine::setContextForObject(QObject *object, QQmlContext *context)
{
    if (!object || !context)
        return;

    QQmlData *data = QQmlData::get(object, true);
    if (data->context) {
        qWarning("QQmlEngine::setContextForObject(): Object already has a QQmlContext");
        return;
    }

    QQmlContextData *contextData = QQmlContextData::get(context);
    contextData->addObject(object);
}

/*!
  \enum QQmlEngine::ObjectOwnership

  ObjectOwnership controls whether or not QML automatically destroys the
  QObject when the corresponding JavaScript object is garbage collected by the
  engine. The two ownership options are:

  \value CppOwnership The object is owned by C++ code and QML will never delete
  it. The JavaScript destroy() method cannot be used on these objects. This
  option is similar to QScriptEngine::QtOwnership.

  \value JavaScriptOwnership The object is owned by JavaScript. When the object
  is returned to QML as the return value of a method call, QML will track it
  and delete it if there are no remaining JavaScript references to it and
  it has no QObject::parent(). An object tracked by one QQmlEngine will be
  deleted during that QQmlEngine's destructor. Thus, JavaScript references
  between objects with JavaScriptOwnership from two different engines will
  not be valid if one of these engines is deleted. This option is similar to
  QScriptEngine::ScriptOwnership.

  Generally an application doesn't need to set an object's ownership
  explicitly. QML uses a heuristic to set the default ownership. By default, an
  object that is created by QML has JavaScriptOwnership. The exception to this
  are the root objects created by calling QQmlComponent::create() or
  QQmlComponent::beginCreate(), which have CppOwnership by default. The
  ownership of these root-level objects is considered to have been transferred
  to the C++ caller.

  Objects not-created by QML have CppOwnership by default. The exception to this
  are objects returned from C++ method calls; their ownership will be set to
  JavaScriptOwnership. This applies only to explicit invocations of Q_INVOKABLE
  methods or slots, but not to property getter invocations.

  Calling setObjectOwnership() overrides the default ownership heuristic used by
  QML.
*/

/*!
  Sets the \a ownership of \a object.
*/
void QQmlEngine::setObjectOwnership(QObject *object, ObjectOwnership ownership)
{
    if (!object)
        return;

    QQmlData *ddata = QQmlData::get(object, true);
    if (!ddata)
        return;

    ddata->indestructible = (ownership == CppOwnership)?true:false;
    ddata->explicitIndestructibleSet = true;
}

/*!
  Returns the ownership of \a object.
*/
QQmlEngine::ObjectOwnership QQmlEngine::objectOwnership(QObject *object)
{
    if (!object)
        return CppOwnership;

    QQmlData *ddata = QQmlData::get(object, false);
    if (!ddata)
        return CppOwnership;
    else
        return ddata->indestructible?CppOwnership:JavaScriptOwnership;
}

/*!
   \reimp
*/
bool QQmlEngine::event(QEvent *e)
{
    Q_D(QQmlEngine);
    if (e->type() == QEvent::User)
        d->doDeleteInEngineThread();

    return QJSEngine::event(e);
}

void QQmlEnginePrivate::doDeleteInEngineThread()
{
    QFieldList<Deletable, &Deletable::next> list;
    mutex.lock();
    list.copyAndClear(toDeleteInEngineThread);
    mutex.unlock();

    while (Deletable *d = list.takeFirst())
        delete d;
}

namespace QtQml {

void qmlExecuteDeferred(QObject *object)
{
    QQmlData *data = QQmlData::get(object);

    if (data && data->deferredData && !data->wasDeleted(object)) {
        QQmlEnginePrivate *ep = QQmlEnginePrivate::get(data->context->engine);

        QQmlComponentPrivate::ConstructionState state;
        QQmlComponentPrivate::beginDeferred(ep, object, &state);

        // Release the reference for the deferral action (we still have one from construction)
        data->deferredData->compiledData->release();
        delete data->deferredData;
        data->deferredData = 0;

        QQmlComponentPrivate::complete(ep, &state);
    }
}

QQmlContext *qmlContext(const QObject *obj)
{
    return QQmlEngine::contextForObject(obj);
}

QQmlEngine *qmlEngine(const QObject *obj)
{
    QQmlData *data = QQmlData::get(obj, false);
    if (!data || !data->context)
        return 0;
    return data->context->engine;
}

QObject *qmlAttachedPropertiesObjectById(int id, const QObject *object, bool create)
{
    QQmlData *data = QQmlData::get(object);
    if (!data)
        return 0; // Attached properties are only on objects created by QML

    QObject *rv = data->hasExtendedData()?data->attachedProperties()->value(id):0;
    if (rv || !create)
        return rv;

    QQmlEnginePrivate *engine = QQmlEnginePrivate::get(data->context);
    QQmlAttachedPropertiesFunc pf = QQmlMetaType::attachedPropertiesFuncById(engine, id);
    if (!pf)
        return 0;

    rv = pf(const_cast<QObject *>(object));

    if (rv)
        data->attachedProperties()->insert(id, rv);

    return rv;
}

QObject *qmlAttachedPropertiesObject(int *idCache, const QObject *object,
                                     const QMetaObject *attachedMetaObject, bool create)
{
    if (*idCache == -1) {
        QQmlEngine *engine = object ? qmlEngine(object) : 0;
        *idCache = QQmlMetaType::attachedPropertiesFuncId(engine ? QQmlEnginePrivate::get(engine) : 0, attachedMetaObject);
    }

    if (*idCache == -1 || !object)
        return 0;

    return qmlAttachedPropertiesObjectById(*idCache, object, create);
}

} // namespace QtQml

#if QT_DEPRECATED_SINCE(5, 1)

// Also define symbols outside namespace to keep binary compatibility with Qt 5.0

Q_QML_EXPORT void qmlExecuteDeferred(QObject *obj)
{
    QtQml::qmlExecuteDeferred(obj);
}

Q_QML_EXPORT QQmlContext *qmlContext(const QObject *obj)
{
    return QtQml::qmlContext(obj);
}

Q_QML_EXPORT QQmlEngine *qmlEngine(const QObject *obj)
{
    return QtQml::qmlEngine(obj);
}

Q_QML_EXPORT QObject *qmlAttachedPropertiesObjectById(int id, const QObject *obj, bool create)
{
    return QtQml::qmlAttachedPropertiesObjectById(id, obj, create);
}

Q_QML_EXPORT QObject *qmlAttachedPropertiesObject(int *idCache, const QObject *object,
                                                  const QMetaObject *attachedMetaObject,
                                                  bool create)
{
    return QtQml::qmlAttachedPropertiesObject(idCache, object, attachedMetaObject, create);
}

#endif // QT_DEPRECATED_SINCE(5, 1)

class QQmlDataExtended {
public:
    QQmlDataExtended();
    ~QQmlDataExtended();

    QHash<int, QObject *> attachedProperties;
};

QQmlDataExtended::QQmlDataExtended()
{
}

QQmlDataExtended::~QQmlDataExtended()
{
}

void QQmlData::NotifyList::layout(QQmlNotifierEndpoint *endpoint)
{
    // Add a temporary sentinel at beginning of list. This will be overwritten
    // when the end point is inserted into the notifies further down.
    endpoint->prev = 0;

    while (endpoint->next) {
        Q_ASSERT(reinterpret_cast<QQmlNotifierEndpoint *>(endpoint->next->prev) == endpoint);
        endpoint = endpoint->next;
    }

    while (endpoint) {
        QQmlNotifierEndpoint *ep = (QQmlNotifierEndpoint *) endpoint->prev;

        int index = endpoint->sourceSignal;
        index = qMin(index, 0xFFFF - 1);

        endpoint->next = notifies[index];
        if (endpoint->next) endpoint->next->prev = &endpoint->next;
        endpoint->prev = &notifies[index];
        notifies[index] = endpoint;

        endpoint = ep;
    }
}

void QQmlData::NotifyList::layout()
{
    Q_ASSERT(maximumTodoIndex >= notifiesSize);

    if (todo) {
        QQmlNotifierEndpoint **old = notifies;
        const int reallocSize = (maximumTodoIndex + 1) * sizeof(QQmlNotifierEndpoint*);
        notifies = (QQmlNotifierEndpoint**)realloc(notifies, reallocSize);
        const int memsetSize = (maximumTodoIndex - notifiesSize + 1) *
                               sizeof(QQmlNotifierEndpoint*);
        memset(notifies + notifiesSize, 0, memsetSize);

        if (notifies != old) {
            for (int ii = 0; ii < notifiesSize; ++ii)
                if (notifies[ii])
                    notifies[ii]->prev = &notifies[ii];
        }

        notifiesSize = maximumTodoIndex + 1;

        layout(todo);
    }

    maximumTodoIndex = 0;
    todo = 0;
}

void QQmlData::addNotify(int index, QQmlNotifierEndpoint *endpoint)
{
    if (!notifyList) {
        notifyList = (NotifyList *)malloc(sizeof(NotifyList));
        notifyList->connectionMask = 0;
        notifyList->maximumTodoIndex = 0;
        notifyList->notifiesSize = 0;
        notifyList->todo = 0;
        notifyList->notifies = 0;
    }

    Q_ASSERT(!endpoint->isConnected());

    index = qMin(index, 0xFFFF - 1);
    notifyList->connectionMask |= (1ULL << quint64(index % 64));

    if (index < notifyList->notifiesSize) {

        endpoint->next = notifyList->notifies[index];
        if (endpoint->next) endpoint->next->prev = &endpoint->next;
        endpoint->prev = &notifyList->notifies[index];
        notifyList->notifies[index] = endpoint;

    } else {
        notifyList->maximumTodoIndex = qMax(int(notifyList->maximumTodoIndex), index);

        endpoint->next = notifyList->todo;
        if (endpoint->next) endpoint->next->prev = &endpoint->next;
        endpoint->prev = &notifyList->todo;
        notifyList->todo = endpoint;
    }
}

/*
    index MUST in the range returned by QObjectPrivate::signalIndex()
    This is different than the index returned by QMetaMethod::methodIndex()
*/
bool QQmlData::signalHasEndpoint(int index)
{
    return notifyList && (notifyList->connectionMask & (1ULL << quint64(index % 64)));
}

void QQmlData::disconnectNotifiers()
{
    if (notifyList) {
        while (notifyList->todo)
            notifyList->todo->disconnect();
        for (int ii = 0; ii < notifyList->notifiesSize; ++ii) {
            while (QQmlNotifierEndpoint *ep = notifyList->notifies[ii])
                ep->disconnect();
        }
        free(notifyList->notifies);
        free(notifyList);
        notifyList = 0;
    }
}

QHash<int, QObject *> *QQmlData::attachedProperties() const
{
    if (!extendedData) extendedData = new QQmlDataExtended;
    return &extendedData->attachedProperties;
}

void QQmlData::destroyed(QObject *object)
{
    if (nextContextObject)
        nextContextObject->prevContextObject = prevContextObject;
    if (prevContextObject)
        *prevContextObject = nextContextObject;

    QQmlAbstractBinding *binding = bindings;
    while (binding) {
        binding->setAddedToObject(false);
        binding = binding->nextBinding();
    }
    if (bindings && !bindings->ref.deref())
        delete bindings;

    if (compiledData) {
        compiledData->release();
        compiledData = 0;
    }

    if (deferredData) {
        deferredData->compiledData->release();
        delete deferredData;
        deferredData = 0;
    }

    QQmlBoundSignal *signalHandler = signalHandlers;
    while (signalHandler) {
        if (signalHandler->isNotifying()) {
            // The object is being deleted during signal handler evaluation.
            // This will cause a crash due to invalid memory access when the
            // evaluation has completed.
            // Abort with a friendly message instead.
            QString locationString;
            QQmlBoundSignalExpression *expr = signalHandler->expression();
            if (expr) {
                QQmlSourceLocation location = expr->sourceLocation();
                if (location.sourceFile.isEmpty())
                    location.sourceFile = QStringLiteral("<Unknown File>");
                locationString.append(location.sourceFile);
                locationString.append(QStringLiteral(":%0: ").arg(location.line));
                QString source = expr->expression();
                if (source.size() > 100) {
                    source.truncate(96);
                    source.append(QStringLiteral(" ..."));
                }
                locationString.append(source);
            } else {
                locationString = QStringLiteral("<Unknown Location>");
            }
            qFatal("Object %p destroyed while one of its QML signal handlers is in progress.\n"
                   "Most likely the object was deleted synchronously (use QObject::deleteLater() "
                   "instead), or the application is running a nested event loop.\n"
                   "This behavior is NOT supported!\n"
                   "%s", object, qPrintable(locationString));
        }

        QQmlBoundSignal *next = signalHandler->m_nextSignal;
        signalHandler->m_prevSignal = 0;
        signalHandler->m_nextSignal = 0;
        delete signalHandler;
        signalHandler = next;
    }

    if (bindingBitsSize > 32)
        free(bindingBits);

    if (propertyCache)
        propertyCache->release();

    if (ownContext && context)
        context->destroy();

    while (guards) {
        QQmlGuard<QObject> *guard = static_cast<QQmlGuard<QObject> *>(guards);
        *guard = (QObject *)0;
        guard->objectDestroyed(object);
    }

    disconnectNotifiers();

    if (extendedData)
        delete extendedData;

    // Dispose the handle.
    jsWrapper.clear();

    if (ownMemory)
        delete this;
}

DEFINE_BOOL_CONFIG_OPTION(parentTest, QML_PARENT_TEST);

void QQmlData::parentChanged(QObject *object, QObject *parent)
{
    if (parentTest()) {
        if (parentFrozen && !QObjectPrivate::get(object)->wasDeleted) {
            QString on;
            QString pn;

            { QDebug dbg(&on); dbg << object; on = on.left(on.length() - 1); }
            { QDebug dbg(&pn); dbg << parent; pn = pn.left(pn.length() - 1); }

            qFatal("Object %s has had its parent frozen by QML and cannot be changed.\n"
                   "User code is attempting to change it to %s.\n"
                   "This behavior is NOT supported!", qPrintable(on), qPrintable(pn));
        }
    }
}

static void QQmlData_setBit(QQmlData *data, QObject *obj, int bit)
{
    if (data->bindingBitsSize == 0 && bit < 32) {
        data->bindingBitsSize = 32;
    }

    if (data->bindingBitsSize <= bit) {
        int props = QQmlMetaObject(obj).propertyCount();
        Q_ASSERT(bit < 2 * props);

        int arraySize = (2 * props + 31) / 32;
        Q_ASSERT(arraySize > 1);

        // special handling for 32 here is to make sure we wipe the first byte
        // when going from bindingBitsValue to bindingBits, and preserve the old
        // set bits so we can restore them after the allocation
        int oldArraySize = data->bindingBitsSize > 32 ? data->bindingBitsSize / 32 : 0;
        quint32 oldValue = data->bindingBitsSize == 32 ? data->bindingBitsValue : 0;

        data->bindingBits = (quint32 *)realloc((data->bindingBitsSize == 32) ? 0 : data->bindingBits,
                                               arraySize * sizeof(quint32));

        memset(data->bindingBits + oldArraySize,
               0x00,
               sizeof(quint32) * (arraySize - oldArraySize));

        data->bindingBitsSize = arraySize * 32;

        // reinstate bindingBitsValue after we dropped it
        if (oldValue) {
            memcpy(data->bindingBits, &oldValue, sizeof(oldValue));
        }
    }

    if (data->bindingBitsSize == 32)
        data->bindingBitsValue |= (1 << (bit % 32));
    else
        data->bindingBits[bit / 32] |= (1 << (bit % 32));
}

static void QQmlData_clearBit(QQmlData *data, int bit)
{
    if (data->bindingBitsSize > bit) {
        if (data->bindingBitsSize == 32)
            data->bindingBitsValue &= ~(1 << (bit % 32));
        else
            data->bindingBits[bit / 32] &= ~(1 << (bit % 32));
    }
}

void QQmlData::clearBindingBit(int coreIndex)
{
    QQmlData_clearBit(this, coreIndex * 2);
}

void QQmlData::setBindingBit(QObject *obj, int coreIndex)
{
    QQmlData_setBit(this, obj, coreIndex * 2);
}

void QQmlData::clearPendingBindingBit(int coreIndex)
{
    QQmlData_clearBit(this, coreIndex * 2 + 1);
}

void QQmlData::setPendingBindingBit(QObject *obj, int coreIndex)
{
    QQmlData_setBit(this, obj, coreIndex * 2 + 1);
}

void QQmlData::ensurePropertyCache(QJSEngine *engine, QObject *object)
{
    Q_ASSERT(engine);
    QQmlData *ddata = QQmlData::get(object, /*create*/true);
    if (ddata->propertyCache)
        return;
    ddata->propertyCache = QJSEnginePrivate::get(engine)->cache(object);
    if (ddata->propertyCache) ddata->propertyCache->addref();
}

void QQmlEnginePrivate::sendQuit()
{
    Q_Q(QQmlEngine);
    emit q->quit();
    if (q->receivers(SIGNAL(quit())) == 0) {
        qWarning("Signal QQmlEngine::quit() emitted, but no receivers connected to handle it.");
    }
}

static void dumpwarning(const QQmlError &error)
{
    QMessageLogger(error.url().toString().toLatin1().constData(),
                   error.line(), 0).warning().nospace()
            << qPrintable(error.toString());
}

static void dumpwarning(const QList<QQmlError> &errors)
{
    for (int ii = 0; ii < errors.count(); ++ii)
        dumpwarning(errors.at(ii));
}

void QQmlEnginePrivate::warning(const QQmlError &error)
{
    Q_Q(QQmlEngine);
    q->warnings(QList<QQmlError>() << error);
    if (outputWarningsToMsgLog)
        dumpwarning(error);
}

void QQmlEnginePrivate::warning(const QList<QQmlError> &errors)
{
    Q_Q(QQmlEngine);
    q->warnings(errors);
    if (outputWarningsToMsgLog)
        dumpwarning(errors);
}

void QQmlEnginePrivate::warning(QQmlDelayedError *error)
{
    warning(error->error());
}

void QQmlEnginePrivate::warning(QQmlEngine *engine, const QQmlError &error)
{
    if (engine)
        QQmlEnginePrivate::get(engine)->warning(error);
    else
        dumpwarning(error);
}

void QQmlEnginePrivate::warning(QQmlEngine *engine, const QList<QQmlError> &error)
{
    if (engine)
        QQmlEnginePrivate::get(engine)->warning(error);
    else
        dumpwarning(error);
}

void QQmlEnginePrivate::warning(QQmlEngine *engine, QQmlDelayedError *error)
{
    if (engine)
        QQmlEnginePrivate::get(engine)->warning(error);
    else
        dumpwarning(error->error());
}

void QQmlEnginePrivate::warning(QQmlEnginePrivate *engine, const QQmlError &error)
{
    if (engine)
        engine->warning(error);
    else
        dumpwarning(error);
}

void QQmlEnginePrivate::warning(QQmlEnginePrivate *engine, const QList<QQmlError> &error)
{
    if (engine)
        engine->warning(error);
    else
        dumpwarning(error);
}

/*
   This function should be called prior to evaluation of any js expression,
   so that scarce resources are not freed prematurely (eg, if there is a
   nested javascript expression).
 */
void QQmlEnginePrivate::referenceScarceResources()
{
    scarceResourcesRefCount += 1;
}

/*
   This function should be called after evaluation of the js expression is
   complete, and so the scarce resources may be freed safely.
 */
void QQmlEnginePrivate::dereferenceScarceResources()
{
    Q_ASSERT(scarceResourcesRefCount > 0);
    scarceResourcesRefCount -= 1;

    // if the refcount is zero, then evaluation of the "top level"
    // expression must have completed.  We can safely release the
    // scarce resources.
    if (scarceResourcesRefCount == 0) {
        // iterate through the list and release them all.
        // note that the actual SRD is owned by the JS engine,
        // so we cannot delete the SRD; but we can free the
        // memory used by the variant in the SRD.
        QV4::ExecutionEngine *engine = QV8Engine::getV4(v8engine());
        while (QV4::ExecutionEngine::ScarceResourceData *sr = engine->scarceResources.first()) {
            sr->data = QVariant();
            engine->scarceResources.remove(sr);
        }
    }
}

/*!
  Adds \a path as a directory where the engine searches for
  installed modules in a URL-based directory structure.

  The \a path may be a local filesystem directory, a
  \l {The Qt Resource System}{Qt Resource} path (\c {:/imports}), a
  \l {The Qt Resource System}{Qt Resource} url (\c {qrc:/imports}) or a URL.

  The \a path will be converted into canonical form before it
  is added to the import path list.

  The newly added \a path will be first in the importPathList().

  \sa setImportPathList(), {QML Modules}
*/
void QQmlEngine::addImportPath(const QString& path)
{
    Q_D(QQmlEngine);
    d->importDatabase.addImportPath(path);
}

/*!
  Returns the list of directories where the engine searches for
  installed modules in a URL-based directory structure.

  For example, if \c /opt/MyApp/lib/imports is in the path, then QML that
  imports \c com.mycompany.Feature will cause the QQmlEngine to look
  in \c /opt/MyApp/lib/imports/com/mycompany/Feature/ for the components
  provided by that module. A \c qmldir file is required for defining the
  type version mapping and possibly QML extensions plugins.

  By default, the list contains the directory of the application executable,
  paths specified in the \c QML2_IMPORT_PATH environment variable,
  and the builtin \c Qml2ImportsPath from QLibraryInfo.

  \sa addImportPath(), setImportPathList()
*/
QStringList QQmlEngine::importPathList() const
{
    Q_D(const QQmlEngine);
    return d->importDatabase.importPathList();
}

/*!
  Sets \a paths as the list of directories where the engine searches for
  installed modules in a URL-based directory structure.

  By default, the list contains the directory of the application executable,
  paths specified in the \c QML2_IMPORT_PATH environment variable,
  and the builtin \c Qml2ImportsPath from QLibraryInfo.

  \sa importPathList(), addImportPath()
  */
void QQmlEngine::setImportPathList(const QStringList &paths)
{
    Q_D(QQmlEngine);
    d->importDatabase.setImportPathList(paths);
}


/*!
  Adds \a path as a directory where the engine searches for
  native plugins for imported modules (referenced in the \c qmldir file).

  By default, the list contains only \c .,  i.e. the engine searches
  in the directory of the \c qmldir file itself.

  The newly added \a path will be first in the pluginPathList().

  \sa setPluginPathList()
*/
void QQmlEngine::addPluginPath(const QString& path)
{
    Q_D(QQmlEngine);
    d->importDatabase.addPluginPath(path);
}


/*!
  Returns the list of directories where the engine searches for
  native plugins for imported modules (referenced in the \c qmldir file).

  By default, the list contains only \c .,  i.e. the engine searches
  in the directory of the \c qmldir file itself.

  \sa addPluginPath(), setPluginPathList()
*/
QStringList QQmlEngine::pluginPathList() const
{
    Q_D(const QQmlEngine);
    return d->importDatabase.pluginPathList();
}

/*!
  Sets the list of directories where the engine searches for
  native plugins for imported modules (referenced in the \c qmldir file)
  to \a paths.

  By default, the list contains only \c .,  i.e. the engine searches
  in the directory of the \c qmldir file itself.

  \sa pluginPathList(), addPluginPath()
  */
void QQmlEngine::setPluginPathList(const QStringList &paths)
{
    Q_D(QQmlEngine);
    d->importDatabase.setPluginPathList(paths);
}

/*!
  Imports the plugin named \a filePath with the \a uri provided.
  Returns true if the plugin was successfully imported; otherwise returns false.

  On failure and if non-null, the \a errors list will have any errors which occurred prepended to it.

  The plugin has to be a Qt plugin which implements the QQmlExtensionPlugin interface.
*/
bool QQmlEngine::importPlugin(const QString &filePath, const QString &uri, QList<QQmlError> *errors)
{
    Q_D(QQmlEngine);
    return d->importDatabase.importDynamicPlugin(filePath, uri, QString(), -1, errors);
}

/*!
  \property QQmlEngine::offlineStoragePath
  \brief the directory for storing offline user data

  Returns the directory where SQL and other offline
  storage is placed.

  QQuickWebView and the SQL databases created with openDatabase()
  are stored here.

  The default is QML/OfflineStorage in the platform-standard
  user application data directory.

  Note that the path may not currently exist on the filesystem, so
  callers wanting to \e create new files at this location should create
  it first - see QDir::mkpath().
*/
void QQmlEngine::setOfflineStoragePath(const QString& dir)
{
    Q_D(QQmlEngine);
    d->offlineStoragePath = dir;
}

QString QQmlEngine::offlineStoragePath() const
{
    Q_D(const QQmlEngine);

    if (d->offlineStoragePath.isEmpty()) {
        QString dataLocation = QStandardPaths::writableLocation(QStandardPaths::DataLocation);
        QQmlEnginePrivate *e = const_cast<QQmlEnginePrivate *>(d);
        if (!dataLocation.isEmpty())
            e->offlineStoragePath = dataLocation.replace(QLatin1Char('/'), QDir::separator())
                                  + QDir::separator() + QLatin1String("QML")
                                  + QDir::separator() + QLatin1String("OfflineStorage");
    }

    return d->offlineStoragePath;
}

QQmlPropertyCache *QQmlEnginePrivate::createCache(QQmlType *type, int minorVersion)
{
    QList<QQmlType *> types;

    int maxMinorVersion = 0;

    const QMetaObject *metaObject = type->metaObject();

    while (metaObject) {
        QQmlType *t = QQmlMetaType::qmlType(metaObject, type->module(),
                                                            type->majorVersion(), minorVersion);
        if (t) {
            maxMinorVersion = qMax(maxMinorVersion, t->minorVersion());
            types << t;
        } else {
            types << 0;
        }

        metaObject = metaObject->superClass();
    }

    if (QQmlPropertyCache *c = typePropertyCache.value(qMakePair(type, maxMinorVersion))) {
        c->addref();
        typePropertyCache.insert(qMakePair(type, minorVersion), c);
        return c;
    }

    QQmlPropertyCache *raw = cache(type->metaObject());

    bool hasCopied = false;

    for (int ii = 0; ii < types.count(); ++ii) {
        QQmlType *currentType = types.at(ii);
        if (!currentType)
            continue;

        int rev = currentType->metaObjectRevision();
        int moIndex = types.count() - 1 - ii;

        if (raw->allowedRevisionCache[moIndex] != rev) {
            if (!hasCopied) {
                raw = raw->copy();
                hasCopied = true;
            }
            raw->allowedRevisionCache[moIndex] = rev;
        }
    }

    // Test revision compatibility - the basic rule is:
    //    * Anything that is excluded, cannot overload something that is not excluded *

    // Signals override:
    //    * other signals and methods of the same name.
    //    * properties named on<Signal Name>
    //    * automatic <property name>Changed notify signals

    // Methods override:
    //    * other methods of the same name

    // Properties override:
    //    * other elements of the same name

#if 0
    bool overloadError = false;
    QString overloadName;

    for (QQmlPropertyCache::StringCache::ConstIterator iter = raw->stringCache.begin();
         !overloadError && iter != raw->stringCache.end();
         ++iter) {

        QQmlPropertyData *d = *iter;
        if (raw->isAllowedInRevision(d))
            continue; // Not excluded - no problems

        // check that a regular "name" overload isn't happening
        QQmlPropertyData *current = d;
        while (!overloadError && current) {
            current = d->overrideData(current);
            if (current && raw->isAllowedInRevision(current))
                overloadError = true;
        }
    }

    if (overloadError) {
        if (hasCopied) raw->release();

        error.setDescription(QLatin1String("Type ") + type->qmlTypeName() + QLatin1Char(' ') + QString::number(type->majorVersion()) + QLatin1Char('.') + QString::number(minorVersion) + QLatin1String(" contains an illegal property \"") + overloadName + QLatin1String("\".  This is an error in the type's implementation."));
        return 0;
    }
#endif

    if (!hasCopied) raw->addref();
    typePropertyCache.insert(qMakePair(type, minorVersion), raw);

    if (minorVersion != maxMinorVersion) {
        raw->addref();
        typePropertyCache.insert(qMakePair(type, maxMinorVersion), raw);
    }

    return raw;
}

bool QQmlEnginePrivate::isQObject(int t)
{
    Locker locker(this);
    return m_compositeTypes.contains(t) || QQmlMetaType::isQObject(t);
}

QObject *QQmlEnginePrivate::toQObject(const QVariant &v, bool *ok) const
{
    Locker locker(this);
    int t = v.userType();
    if (t == QMetaType::QObjectStar || m_compositeTypes.contains(t)) {
        if (ok) *ok = true;
        return *(QObject *const *)(v.constData());
    } else {
        return QQmlMetaType::toQObject(v, ok);
    }
}

QQmlMetaType::TypeCategory QQmlEnginePrivate::typeCategory(int t) const
{
    Locker locker(this);
    if (m_compositeTypes.contains(t))
        return QQmlMetaType::Object;
    else if (m_qmlLists.contains(t))
        return QQmlMetaType::List;
    else
        return QQmlMetaType::typeCategory(t);
}

bool QQmlEnginePrivate::isList(int t) const
{
    Locker locker(this);
    return m_qmlLists.contains(t) || QQmlMetaType::isList(t);
}

int QQmlEnginePrivate::listType(int t) const
{
    Locker locker(this);
    QHash<int, int>::ConstIterator iter = m_qmlLists.constFind(t);
    if (iter != m_qmlLists.cend())
        return *iter;
    else
        return QQmlMetaType::listType(t);
}

QQmlMetaObject QQmlEnginePrivate::rawMetaObjectForType(int t) const
{
    Locker locker(this);
    QHash<int, QQmlCompiledData *>::ConstIterator iter = m_compositeTypes.constFind(t);
    if (iter != m_compositeTypes.cend()) {
        return QQmlMetaObject((*iter)->rootPropertyCache);
    } else {
        QQmlType *type = QQmlMetaType::qmlType(t);
        return QQmlMetaObject(type?type->baseMetaObject():0);
    }
}

QQmlMetaObject QQmlEnginePrivate::metaObjectForType(int t) const
{
    Locker locker(this);
    QHash<int, QQmlCompiledData *>::ConstIterator iter = m_compositeTypes.constFind(t);
    if (iter != m_compositeTypes.cend()) {
        return QQmlMetaObject((*iter)->rootPropertyCache);
    } else {
        QQmlType *type = QQmlMetaType::qmlType(t);
        return QQmlMetaObject(type?type->metaObject():0);
    }
}

QQmlPropertyCache *QQmlEnginePrivate::propertyCacheForType(int t)
{
    Locker locker(this);
    QHash<int, QQmlCompiledData*>::ConstIterator iter = m_compositeTypes.constFind(t);
    if (iter != m_compositeTypes.cend()) {
        return (*iter)->rootPropertyCache;
    } else {
        QQmlType *type = QQmlMetaType::qmlType(t);
        locker.unlock();
        return type?cache(type->metaObject()):0;
    }
}

QQmlPropertyCache *QQmlEnginePrivate::rawPropertyCacheForType(int t)
{
    Locker locker(this);
    QHash<int, QQmlCompiledData*>::ConstIterator iter = m_compositeTypes.constFind(t);
    if (iter != m_compositeTypes.cend()) {
        return (*iter)->rootPropertyCache;
    } else {
        QQmlType *type = QQmlMetaType::qmlType(t);
        locker.unlock();
        return type?cache(type->baseMetaObject()):0;
    }
}

void QQmlEnginePrivate::registerInternalCompositeType(QQmlCompiledData *data)
{
    QByteArray name = data->rootPropertyCache->className();

    QByteArray ptr = name + '*';
    QByteArray lst = "QQmlListProperty<" + name + '>';

    int ptr_type = QMetaType::registerNormalizedType(ptr,
                                                     QtMetaTypePrivate::QMetaTypeFunctionHelper<QObject*>::Destruct,
                                                     QtMetaTypePrivate::QMetaTypeFunctionHelper<QObject*>::Construct,
                                                     sizeof(QObject*),
                                                     static_cast<QFlags<QMetaType::TypeFlag> >(QtPrivate::QMetaTypeTypeFlags<QObject*>::Flags),
                                                     0);
    int lst_type = QMetaType::registerNormalizedType(lst,
                                                     QtMetaTypePrivate::QMetaTypeFunctionHelper<QQmlListProperty<QObject> >::Destruct,
                                                     QtMetaTypePrivate::QMetaTypeFunctionHelper<QQmlListProperty<QObject> >::Construct,
                                                     sizeof(QQmlListProperty<QObject>),
                                                     static_cast<QFlags<QMetaType::TypeFlag> >(QtPrivate::QMetaTypeTypeFlags<QQmlListProperty<QObject> >::Flags),
                                                     static_cast<QMetaObject*>(0));

    data->metaTypeId = ptr_type;
    data->listMetaTypeId = lst_type;
    data->isRegisteredWithEngine = true;

    Locker locker(this);
    m_qmlLists.insert(lst_type, ptr_type);
    // The QQmlCompiledData is not referenced here, but it is removed from this
    // hash in the QQmlCompiledData destructor
    m_compositeTypes.insert(ptr_type, data);
}

void QQmlEnginePrivate::unregisterInternalCompositeType(QQmlCompiledData *data)
{
    int ptr_type = data->metaTypeId;
    int lst_type = data->listMetaTypeId;

    Locker locker(this);
    m_qmlLists.remove(lst_type);
    m_compositeTypes.remove(ptr_type);

    QMetaType::unregisterType(ptr_type);
    QMetaType::unregisterType(lst_type);
}

bool QQmlEnginePrivate::isTypeLoaded(const QUrl &url) const
{
    return typeLoader.isTypeLoaded(url);
}

bool QQmlEnginePrivate::isScriptLoaded(const QUrl &url) const
{
    return typeLoader.isScriptLoaded(url);
}

#if defined(Q_OS_WIN) && !defined(Q_OS_WINCE) && !defined(Q_OS_WINRT)
// Normalize a file name using Shell API. As opposed to converting it
// to a short 8.3 name and back, this also works for drives where 8.3 notation
// is disabled (see 8dot3name options of fsutil.exe).
static inline QString shellNormalizeFileName(const QString &name)
{
    const QString nativeSeparatorName(QDir::toNativeSeparators(name));
    const LPCTSTR nameC = reinterpret_cast<LPCTSTR>(nativeSeparatorName.utf16());
// The correct declaration of the SHGetPathFromIDList symbol is
// being used in mingw-w64 as of r6215, which is a v3 snapshot.
#if defined(Q_CC_MINGW) && (!defined(__MINGW64_VERSION_MAJOR) || __MINGW64_VERSION_MAJOR < 3)
    ITEMIDLIST *file;
    if (FAILED(SHParseDisplayName(nameC, NULL, reinterpret_cast<LPITEMIDLIST>(&file), 0, NULL)))
        return name;
#else
    PIDLIST_ABSOLUTE file;
    if (FAILED(SHParseDisplayName(nameC, NULL, &file, 0, NULL)))
        return name;
#endif
    TCHAR buffer[MAX_PATH];
    bool gotPath = SHGetPathFromIDList(file, buffer);
    ILFree(file);

    if (!gotPath)
        return name;

    QString canonicalName = QString::fromWCharArray(buffer);
    // Upper case drive letter
    if (canonicalName.size() > 2 && canonicalName.at(1) == QLatin1Char(':'))
        canonicalName[0] = canonicalName.at(0).toUpper();
    return QDir::cleanPath(canonicalName);
}
#endif // Q_OS_WIN && !Q_OS_WINCE && !Q_OS_WINRT

bool QQml_isFileCaseCorrect(const QString &fileName, int lengthIn /* = -1 */)
{
#if defined(Q_OS_MAC) || defined(Q_OS_WIN)
    QFileInfo info(fileName);
    const QString absolute = info.absoluteFilePath();

#if defined(Q_OS_MAC) || defined(Q_OS_WINCE) || defined(Q_OS_WINRT)
    const QString canonical = info.canonicalFilePath();
#elif defined(Q_OS_WIN)
    // No difference if the path is qrc based
    if (absolute[0] == QLatin1Char(':'))
        return true;
    const QString canonical = shellNormalizeFileName(absolute);
#endif

    const int absoluteLength = absolute.length();
    const int canonicalLength = canonical.length();

    int length = qMin(absoluteLength, canonicalLength);
    if (lengthIn >= 0) {
        length = qMin(lengthIn, length);
    } else {
        // No length given: Limit to file name. Do not trigger
        // on drive letters or folder names.
        int lastSlash = absolute.lastIndexOf(QLatin1Char('/'));
        if (lastSlash < 0)
            lastSlash = absolute.lastIndexOf(QLatin1Char('\\'));
        if (lastSlash >= 0) {
            const int fileNameLength = absoluteLength - 1 - lastSlash;
            length = qMin(length, fileNameLength);
        }
    }

    for (int ii = 0; ii < length; ++ii) {
        const QChar &a = absolute.at(absoluteLength - 1 - ii);
        const QChar &c = canonical.at(canonicalLength - 1 - ii);

        if (a.toLower() != c.toLower())
            return true;
        if (a != c)
            return false;
    }
#else
    Q_UNUSED(lengthIn)
    Q_UNUSED(fileName)
#endif
    return true;
}

/*!
    \fn QQmlEngine *qmlEngine(const QObject *object)
    \relates QQmlEngine

    Returns the QQmlEngine associated with \a object, if any.  This is equivalent to
    QQmlEngine::contextForObject(object)->engine(), but more efficient.

    \note Add \c{#include <QtQml>} to use this function.

    \sa {QQmlEngine::contextForObject()}{contextForObject()}, qmlContext()
*/

/*!
    \fn QQmlContext *qmlContext(const QObject *object)
    \relates QQmlEngine

    Returns the QQmlContext associated with \a object, if any.  This is equivalent to
    QQmlEngine::contextForObject(object).

    \note Add \c{#include <QtQml>} to use this function.

    \sa {QQmlEngine::contextForObject()}{contextForObject()}, qmlEngine()
*/

QT_END_NAMESPACE