summaryrefslogtreecommitdiffstats
path: root/src/declarative/qml/qdeclarativeproperty.cpp
blob: 0dd0edbfd099e9266e2f71322e1c85d7097b9ce9 (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
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qdeclarativeproperty.h"
#include "private/qdeclarativeproperty_p.h"

#include "qdeclarative.h"
#include "private/qdeclarativebinding_p.h"
#include "qdeclarativecontext.h"
#include "private/qdeclarativecontext_p.h"
#include "private/qdeclarativeboundsignal_p.h"
#include "qdeclarativeengine.h"
#include "private/qdeclarativeengine_p.h"
#include "private/qdeclarativedata_p.h"
#include "private/qdeclarativestringconverters_p.h"
#include "private/qdeclarativelist_p.h"
#include "private/qdeclarativecompiler_p.h"
#include "private/qdeclarativevmemetaobject_p.h"

#include <QStringList>
#include <QtCore/qdebug.h>

#include <math.h>

QT_BEGIN_NAMESPACE

/*!
\class QDeclarativeProperty
\since 4.7
\brief The QDeclarativeProperty class abstracts accessing properties on objects created from  QML.

As QML uses Qt's meta-type system all of the existing QMetaObject classes can be used to introspect
and interact with objects created by QML.  However, some of the new features provided by QML - such 
as type safety and attached properties - are most easily used through the QDeclarativeProperty class 
that simplifies some of their natural complexity.

Unlike QMetaProperty which represents a property on a class type, QDeclarativeProperty encapsulates 
a property on a specific object instance.  To read a property's value, programmers create a 
QDeclarativeProperty instance and call the read() method.  Likewise to write a property value the
write() method is used.

For example, for the following QML code:

\qml
// MyItem.qml
import QtQuick 1.0

Text { text: "A bit of text" }
\endqml

The \l Text object's properties could be accessed using QDeclarativeProperty, like this:

\code
#include <QDeclarativeProperty>
#include <QGraphicsObject>

...

QDeclarativeView view(QUrl::fromLocalFile("MyItem.qml"));
QDeclarativeProperty property(view.rootObject(), "font.pixelSize");
qWarning() << "Current pixel size:" << property.read().toInt();
property.write(24);
qWarning() << "Pixel size should now be 24:" << property.read().toInt();
\endcode
*/

/*!
    Create an invalid QDeclarativeProperty.
*/
QDeclarativeProperty::QDeclarativeProperty()
: d(0)
{
}

/*!  \internal */
QDeclarativeProperty::~QDeclarativeProperty()
{
    if (d)
        d->release();
    d = 0;
}

/*!
    Creates a QDeclarativeProperty for the default property of \a obj. If there is no
    default property, an invalid QDeclarativeProperty will be created.
 */
QDeclarativeProperty::QDeclarativeProperty(QObject *obj)
: d(new QDeclarativePropertyPrivate)
{
    d->initDefault(obj);
}

/*!
    Creates a QDeclarativeProperty for the default property of \a obj
    using the \l{QDeclarativeContext} {context} \a ctxt. If there is
    no default property, an invalid QDeclarativeProperty will be
    created.
 */
QDeclarativeProperty::QDeclarativeProperty(QObject *obj, QDeclarativeContext *ctxt)
: d(new QDeclarativePropertyPrivate)
{
    d->context = ctxt?QDeclarativeContextData::get(ctxt):0;
    d->engine = ctxt?ctxt->engine():0;
    d->initDefault(obj);
}

/*!
    Creates a QDeclarativeProperty for the default property of \a obj
    using the environment for instantiating QML components that is
    provided by \a engine.  If there is no default property, an
    invalid QDeclarativeProperty will be created.
 */
QDeclarativeProperty::QDeclarativeProperty(QObject *obj, QDeclarativeEngine *engine)
  : d(new QDeclarativePropertyPrivate)
{
    d->context = 0;
    d->engine = engine;
    d->initDefault(obj);
}

/*!
    Initialize from the default property of \a obj
*/
void QDeclarativePropertyPrivate::initDefault(QObject *obj)
{
    if (!obj)
        return;

    QMetaProperty p = QDeclarativeMetaType::defaultProperty(obj);
    core.load(p);
    if (core.isValid()) 
        object = obj;
}

/*!
    Creates a QDeclarativeProperty for the property \a name of \a obj.
 */
QDeclarativeProperty::QDeclarativeProperty(QObject *obj, const QString &name)
: d(new QDeclarativePropertyPrivate)
{
    d->initProperty(obj, name);
    if (!isValid()) d->object = 0;
}

/*!
    Creates a QDeclarativeProperty for the property \a name of \a obj
    using the \l{QDeclarativeContext} {context} \a ctxt.
*/
QDeclarativeProperty::QDeclarativeProperty(QObject *obj, const QString &name, QDeclarativeContext *ctxt)
: d(new QDeclarativePropertyPrivate)
{
    d->context = ctxt?QDeclarativeContextData::get(ctxt):0;
    d->engine = ctxt?ctxt->engine():0;
    d->initProperty(obj, name);
    if (!isValid()) { d->object = 0; d->context = 0; d->engine = 0; }
}

/*!
    Creates a QDeclarativeProperty for the property \a name of \a obj
    using the environment for instantiating QML components that is
    provided by \a engine.
 */
QDeclarativeProperty::QDeclarativeProperty(QObject *obj, const QString &name, QDeclarativeEngine *engine)
: d(new QDeclarativePropertyPrivate)
{
    d->context = 0;
    d->engine = engine;
    d->initProperty(obj, name);
    if (!isValid()) { d->object = 0; d->context = 0; d->engine = 0; }
}

Q_GLOBAL_STATIC(QDeclarativeValueTypeFactory, qmlValueTypes);

void QDeclarativePropertyPrivate::initProperty(QObject *obj, const QString &name)
{
    if (!obj) return;

    QDeclarativeTypeNameCache *typeNameCache = context?context->imports:0;

    QStringList path = name.split(QLatin1Char('.'));
    if (path.isEmpty()) return;

    QObject *currentObject = obj;

    // Everything up to the last property must be an "object type" property
    for (int ii = 0; ii < path.count() - 1; ++ii) {
        const QString &pathName = path.at(ii);

        if (QDeclarativeTypeNameCache::Data *data = typeNameCache?typeNameCache->data(pathName):0) {
            if (data->type) {
                QDeclarativeAttachedPropertiesFunc func = data->type->attachedPropertiesFunction();
                if (!func) return; // Not an attachable type

                currentObject = qmlAttachedPropertiesObjectById(data->type->attachedPropertiesId(), currentObject);
                if (!currentObject) return; // Something is broken with the attachable type
            } else {
                Q_ASSERT(data->typeNamespace);
                if ((ii + 1) == path.count()) return; // No type following the namespace
                
                ++ii; data = data->typeNamespace->data(path.at(ii));
                if (!data || !data->type) return; // Invalid type in namespace 

                QDeclarativeAttachedPropertiesFunc func = data->type->attachedPropertiesFunction();
                if (!func) return; // Not an attachable type

                currentObject = qmlAttachedPropertiesObjectById(data->type->attachedPropertiesId(), currentObject);
                if (!currentObject) return; // Something is broken with the attachable type
            }
        } else {

            QDeclarativePropertyCache::Data local;
            QDeclarativePropertyCache::Data *property = 
                QDeclarativePropertyCache::property(engine, obj, pathName, local);

            if (!property) return; // Not a property
            if (property->flags & QDeclarativePropertyCache::Data::IsFunction) 
                return; // Not an object property 

            if (ii == (path.count() - 2) && QDeclarativeValueTypeFactory::isValueType(property->propType)) {
                // We're now at a value type property.  We can use a global valuetypes array as we 
                // never actually use the objects, just look up their properties.
                QObject *typeObject = (*qmlValueTypes())[property->propType];
                if (!typeObject) return; // Not a value type

                int idx = typeObject->metaObject()->indexOfProperty(path.last().toUtf8().constData());
                if (idx == -1) return; // Value type property does not exist

                QMetaProperty vtProp = typeObject->metaObject()->property(idx);

                object = currentObject;
                core = *property;
                valueType.flags = QDeclarativePropertyCache::Data::flagsForProperty(vtProp);
                valueType.valueTypeCoreIdx = idx;
                valueType.valueTypePropType = vtProp.userType();

                return; 
            } else {
                if (!(property->flags & QDeclarativePropertyCache::Data::IsQObjectDerived)) 
                    return; // Not an object property

                void *args[] = { &currentObject, 0 };
                QMetaObject::metacall(currentObject, QMetaObject::ReadProperty, property->coreIndex, args);
                if (!currentObject) return; // No value

            }
        }

    }

    const QString &terminal = path.last();

    if (terminal.count() >= 3 &&
        terminal.at(0) == QLatin1Char('o') &&
        terminal.at(1) == QLatin1Char('n') &&
        terminal.at(2).isUpper()) {

        QString signalName = terminal.mid(2);
        signalName[0] = signalName.at(0).toLower();

        QMetaMethod method = findSignalByName(currentObject->metaObject(), signalName.toLatin1().constData());
        if (method.signature()) {
            object = currentObject;
            core.load(method);
            return;
        }
    }

    // Property
    QDeclarativePropertyCache::Data local;
    QDeclarativePropertyCache::Data *property = 
        QDeclarativePropertyCache::property(engine, currentObject, terminal, local);
    if (property && !(property->flags & QDeclarativePropertyCache::Data::IsFunction)) {
        object = currentObject;
        core = *property;
        nameCache = terminal;
        isNameCached = true;
    }
}

/*!
    Create a copy of \a other.
*/
QDeclarativeProperty::QDeclarativeProperty(const QDeclarativeProperty &other)
{
    d = other.d;
    if (d)
        d->addref();
}

/*!
  \enum QDeclarativeProperty::PropertyTypeCategory

  This enum specifies a category of QML property.

  \value InvalidCategory The property is invalid, or is a signal property.
  \value List The property is a QDeclarativeListProperty list property
  \value Object The property is a QObject derived type pointer
  \value Normal The property is a normal value property.
 */

/*!
  \enum QDeclarativeProperty::Type

  This enum specifies a type of QML property.

  \value Invalid The property is invalid.
  \value Property The property is a regular Qt property.
  \value SignalProperty The property is a signal property.
*/

/*!
    Returns the property category.
*/
QDeclarativeProperty::PropertyTypeCategory QDeclarativeProperty::propertyTypeCategory() const
{
    return d ? d->propertyTypeCategory() : InvalidCategory;
}

QDeclarativeProperty::PropertyTypeCategory 
QDeclarativePropertyPrivate::propertyTypeCategory() const
{
    uint type = this->type();

    if (isValueType()) {
        return QDeclarativeProperty::Normal;
    } else if (type & QDeclarativeProperty::Property) {
        int type = propertyType();
        if (type == QVariant::Invalid)
            return QDeclarativeProperty::InvalidCategory;
        else if (QDeclarativeValueTypeFactory::isValueType((uint)type))
            return QDeclarativeProperty::Normal;
        else if (core.flags & QDeclarativePropertyCache::Data::IsQObjectDerived)
            return QDeclarativeProperty::Object;
        else if (core.flags & QDeclarativePropertyCache::Data::IsQList)
            return QDeclarativeProperty::List;
        else 
            return QDeclarativeProperty::Normal;
    } else {
        return QDeclarativeProperty::InvalidCategory;
    }
}

/*!
    Returns the type name of the property, or 0 if the property has no type
    name.
*/
const char *QDeclarativeProperty::propertyTypeName() const
{
    if (!d)
        return 0;
    if (d->isValueType()) {

        QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(d->context);
        QDeclarativeValueType *valueType = 0;
        if (ep) valueType = ep->valueTypes[d->core.propType];
        else valueType = QDeclarativeValueTypeFactory::valueType(d->core.propType);
        Q_ASSERT(valueType);

        const char *rv = valueType->metaObject()->property(d->valueType.valueTypeCoreIdx).typeName();

        if (!ep) delete valueType;

        return rv;
    } else if (d->object && type() & Property && d->core.isValid()) {
        return d->object->metaObject()->property(d->core.coreIndex).typeName();
    } else {
        return 0;
    }
}

/*!
    Returns true if \a other and this QDeclarativeProperty represent the same 
    property.
*/
bool QDeclarativeProperty::operator==(const QDeclarativeProperty &other) const
{
    if (!d || !other.d)
        return false;
    // category is intentially omitted here as it is generated 
    // from the other members
    return d->object == other.d->object &&
           d->core == other.d->core &&
           d->valueType == other.d->valueType;
}

/*!
    Returns the QVariant type of the property, or QVariant::Invalid if the 
    property has no QVariant type.
*/
int QDeclarativeProperty::propertyType() const
{
    return d ? d->propertyType() : int(QVariant::Invalid);
}

bool QDeclarativePropertyPrivate::isValueType() const
{
    return valueType.valueTypeCoreIdx != -1;
}

int QDeclarativePropertyPrivate::propertyType() const
{
    uint type = this->type();
    if (isValueType()) {
        return valueType.valueTypePropType;
    } else if (type & QDeclarativeProperty::Property) {
        if (core.propType == (int)QVariant::LastType)
            return qMetaTypeId<QVariant>();
        else
            return core.propType;
    } else {
        return QVariant::Invalid;
    }
}

QDeclarativeProperty::Type QDeclarativePropertyPrivate::type() const
{
    if (core.flags & QDeclarativePropertyCache::Data::IsFunction)
        return QDeclarativeProperty::SignalProperty;
    else if (core.isValid())
        return QDeclarativeProperty::Property;
    else
        return QDeclarativeProperty::Invalid;
}

/*!
    Returns the type of the property.
*/
QDeclarativeProperty::Type QDeclarativeProperty::type() const
{
    return d ? d->type() : Invalid;
}

/*!
    Returns true if this QDeclarativeProperty represents a regular Qt property.
*/
bool QDeclarativeProperty::isProperty() const
{
    return type() & Property;
}

/*!
    Returns true if this QDeclarativeProperty represents a QML signal property.
*/
bool QDeclarativeProperty::isSignalProperty() const
{
    return type() & SignalProperty;
}

/*!
    Returns the QDeclarativeProperty's QObject.
*/
QObject *QDeclarativeProperty::object() const
{
    return d ? d->object : 0;
}

/*!
    Assign \a other to this QDeclarativeProperty.
*/
QDeclarativeProperty &QDeclarativeProperty::operator=(const QDeclarativeProperty &other)
{
    if (d)
        d->release();
    d = other.d;
    if (d)
        d->addref();

    return *this;
}

/*!
    Returns true if the property is writable, otherwise false.
*/
bool QDeclarativeProperty::isWritable() const
{
    if (!d)
        return false;
    if (!d->object)
        return false;
    if (d->core.flags & QDeclarativePropertyCache::Data::IsQList)           //list
        return true;
    else if (d->core.flags & QDeclarativePropertyCache::Data::IsFunction)   //signal handler
        return false;
    else if (d->core.isValid())                                             //normal property
        return d->core.flags & QDeclarativePropertyCache::Data::IsWritable;
    else
        return false;
}

/*!
    Returns true if the property is designable, otherwise false.
*/
bool QDeclarativeProperty::isDesignable() const
{
    if (!d)
        return false;
    if (type() & Property && d->core.isValid() && d->object)
        return d->object->metaObject()->property(d->core.coreIndex).isDesignable();
    else
        return false;
}

/*!
    Returns true if the property is resettable, otherwise false.
*/
bool QDeclarativeProperty::isResettable() const
{
    if (!d)
        return false;
    if (type() & Property && d->core.isValid() && d->object)
        return d->core.flags & QDeclarativePropertyCache::Data::IsResettable;
    else
        return false;
}

/*!
    Returns true if the QDeclarativeProperty refers to a valid property, otherwise
    false.
*/
bool QDeclarativeProperty::isValid() const
{
    if (!d)
        return false;
    return type() != Invalid;
}

/*!
    Return the name of this QML property.
*/
QString QDeclarativeProperty::name() const
{
    if (!d)
        return QString();
    if (!d->isNameCached) {
        // ###
        if (!d->object) {
        } else if (d->isValueType()) {
            QString rv = d->core.name(d->object) + QLatin1Char('.');

            QDeclarativeEnginePrivate *ep = d->engine?QDeclarativeEnginePrivate::get(d->engine):0;
            QDeclarativeValueType *valueType = 0;
            if (ep) valueType = ep->valueTypes[d->core.propType];
            else valueType = QDeclarativeValueTypeFactory::valueType(d->core.propType);
            Q_ASSERT(valueType);

            rv += QString::fromUtf8(valueType->metaObject()->property(d->valueType.valueTypeCoreIdx).name());

            if (!ep) delete valueType;

            d->nameCache = rv;
        } else if (type() & SignalProperty) {
            QString name = QLatin1String("on") + d->core.name(d->object);
            name[2] = name.at(2).toUpper();
            d->nameCache = name;
        } else {
            d->nameCache = d->core.name(d->object);
        }
        d->isNameCached = true;
    }

    return d->nameCache;
}

/*!
  Returns the \l{QMetaProperty} {Qt property} associated with
  this QML property.
 */
QMetaProperty QDeclarativeProperty::property() const
{
    if (!d)
        return QMetaProperty();
    if (type() & Property && d->core.isValid() && d->object)
        return d->object->metaObject()->property(d->core.coreIndex);
    else
        return QMetaProperty();
}

/*!
    Return the QMetaMethod for this property if it is a SignalProperty, 
    otherwise returns an invalid QMetaMethod.
*/
QMetaMethod QDeclarativeProperty::method() const
{
    if (!d)
        return QMetaMethod();
    if (type() & SignalProperty && d->object)
        return d->object->metaObject()->method(d->core.coreIndex);
    else
        return QMetaMethod();
}

/*!
    Returns the binding associated with this property, or 0 if no binding 
    exists.
*/
QDeclarativeAbstractBinding *
QDeclarativePropertyPrivate::binding(const QDeclarativeProperty &that) 
{
    if (!that.d || !that.isProperty() || !that.d->object)
        return 0;

    return binding(that.d->object, that.d->core.coreIndex, that.d->valueType.valueTypeCoreIdx);
}

/*!
    Set the binding associated with this property to \a newBinding.  Returns
    the existing binding (if any), otherwise 0.

    \a newBinding will be enabled, and the returned binding (if any) will be
    disabled.

    Ownership of \a newBinding transfers to QML.  Ownership of the return value
    is assumed by the caller.

    \a flags is passed through to the binding and is used for the initial update (when
    the binding sets the initial value, it will use these flags for the write).
*/
QDeclarativeAbstractBinding *
QDeclarativePropertyPrivate::setBinding(const QDeclarativeProperty &that,
                                            QDeclarativeAbstractBinding *newBinding, 
                                            WriteFlags flags) 
{
    if (!that.d || !that.isProperty() || !that.d->object) {
        if (newBinding)
            newBinding->destroy();
        return 0;
    }

    return that.d->setBinding(that.d->object, that.d->core.coreIndex, 
                              that.d->valueType.valueTypeCoreIdx, newBinding, flags);
}

QDeclarativeAbstractBinding *
QDeclarativePropertyPrivate::binding(QObject *object, int coreIndex, int valueTypeIndex)
{
    QDeclarativeData *data = QDeclarativeData::get(object);
    if (!data)
        return 0;

    QDeclarativePropertyCache::Data *propertyData = 
        data->propertyCache?data->propertyCache->property(coreIndex):0;
    if (propertyData && propertyData->flags & QDeclarativePropertyCache::Data::IsAlias) {
        const QDeclarativeVMEMetaObject *vme = 
            static_cast<const QDeclarativeVMEMetaObject *>(metaObjectForProperty(object->metaObject(), coreIndex));

        QObject *aObject = 0; int aCoreIndex = -1; int aValueTypeIndex = -1;
        if (!vme->aliasTarget(coreIndex, &aObject, &aCoreIndex, &aValueTypeIndex) || aCoreIndex == -1)
            return 0;

        // This will either be a value type sub-reference or an alias to a value-type sub-reference not both
        Q_ASSERT(valueTypeIndex == -1 || aValueTypeIndex == -1);
        return binding(aObject, aCoreIndex, (valueTypeIndex == -1)?aValueTypeIndex:valueTypeIndex);
    }

    if (!data->hasBindingBit(coreIndex))
        return 0;

    QDeclarativeAbstractBinding *binding = data->bindings;
    while (binding && binding->propertyIndex() != coreIndex)
        binding = binding->m_nextBinding;

    if (binding && valueTypeIndex != -1) {
        if (binding->bindingType() == QDeclarativeAbstractBinding::ValueTypeProxy) {
            int index = coreIndex | (valueTypeIndex << 24);
            binding = static_cast<QDeclarativeValueTypeProxyBinding *>(binding)->binding(index);
        }
    }

    return binding;
}

void QDeclarativePropertyPrivate::findAliasTarget(QObject *object, int bindingIndex, 
                                                  QObject **targetObject, int *targetBindingIndex)
{
    int coreIndex = bindingIndex & 0xFFFFFF;
    int valueTypeIndex = bindingIndex >> 24;
    if (valueTypeIndex == 0) valueTypeIndex = -1;

    QDeclarativeData *data = QDeclarativeData::get(object, false);
    if (data) {
        QDeclarativePropertyCache::Data *propertyData = 
            data->propertyCache?data->propertyCache->property(coreIndex):0;
        if (propertyData && propertyData->flags & QDeclarativePropertyCache::Data::IsAlias) {
            const QDeclarativeVMEMetaObject *vme = 
                static_cast<const QDeclarativeVMEMetaObject *>(metaObjectForProperty(object->metaObject(), coreIndex));
            QObject *aObject = 0; int aCoreIndex = -1; int aValueTypeIndex = -1;
            if (vme->aliasTarget(coreIndex, &aObject, &aCoreIndex, &aValueTypeIndex)) {
                // This will either be a value type sub-reference or an alias to a value-type sub-reference not both
                Q_ASSERT(valueTypeIndex == -1 || aValueTypeIndex == -1);

                int aBindingIndex = aCoreIndex;
                if (aValueTypeIndex != -1) 
                    aBindingIndex |= aValueTypeIndex << 24;
                else if (valueTypeIndex != -1)
                    aBindingIndex |= valueTypeIndex << 24;

                findAliasTarget(aObject, aBindingIndex, targetObject, targetBindingIndex);
                return;
            }
        }
    }

    *targetObject = object; 
    *targetBindingIndex = bindingIndex;
}

QDeclarativeAbstractBinding *
QDeclarativePropertyPrivate::setBinding(QObject *object, int coreIndex, int valueTypeIndex,
                                        QDeclarativeAbstractBinding *newBinding, WriteFlags flags)
{
    QDeclarativeData *data = QDeclarativeData::get(object, 0 != newBinding);
    QDeclarativeAbstractBinding *binding = 0;

    if (data) {
        QDeclarativePropertyCache::Data *propertyData = 
            data->propertyCache?data->propertyCache->property(coreIndex):0;
        if (propertyData && propertyData->flags & QDeclarativePropertyCache::Data::IsAlias) {
            const QDeclarativeVMEMetaObject *vme = 
                static_cast<const QDeclarativeVMEMetaObject *>(metaObjectForProperty(object->metaObject(), coreIndex));

            QObject *aObject = 0; int aCoreIndex = -1; int aValueTypeIndex = -1;
            if (!vme->aliasTarget(coreIndex, &aObject, &aCoreIndex, &aValueTypeIndex)) {
                if (newBinding) newBinding->destroy();
                return 0;
            }

            // This will either be a value type sub-reference or an alias to a value-type sub-reference not both
            Q_ASSERT(valueTypeIndex == -1 || aValueTypeIndex == -1);
            return setBinding(aObject, aCoreIndex, (valueTypeIndex == -1)?aValueTypeIndex:valueTypeIndex,
                              newBinding, flags);
        }
    }

    if (data && data->hasBindingBit(coreIndex)) {
        binding = data->bindings;

        while (binding && binding->propertyIndex() != coreIndex) 
            binding = binding->m_nextBinding;
    }

    int index = coreIndex;
    if (valueTypeIndex != -1)
        index |= (valueTypeIndex << 24);

    if (binding && valueTypeIndex != -1 && binding->bindingType() == QDeclarativeAbstractBinding::ValueTypeProxy) 
        binding = static_cast<QDeclarativeValueTypeProxyBinding *>(binding)->binding(index);

    if (binding) {
        binding->removeFromObject();
        binding->setEnabled(false, 0);
    }

    if (newBinding) {
        newBinding->addToObject(object, index);
        newBinding->setEnabled(true, flags);
    }

    return binding;
}

QDeclarativeAbstractBinding *
QDeclarativePropertyPrivate::setBindingNoEnable(QObject *object, int coreIndex, int valueTypeIndex,
                                                QDeclarativeAbstractBinding *newBinding)
{
    QDeclarativeData *data = QDeclarativeData::get(object, 0 != newBinding);
    QDeclarativeAbstractBinding *binding = 0;

    if (data) {
        QDeclarativePropertyCache::Data *propertyData = 
            data->propertyCache?data->propertyCache->property(coreIndex):0;
        if (propertyData && propertyData->flags & QDeclarativePropertyCache::Data::IsAlias) {
            const QDeclarativeVMEMetaObject *vme = 
                static_cast<const QDeclarativeVMEMetaObject *>(metaObjectForProperty(object->metaObject(), coreIndex));

            QObject *aObject = 0; int aCoreIndex = -1; int aValueTypeIndex = -1;
            if (!vme->aliasTarget(coreIndex, &aObject, &aCoreIndex, &aValueTypeIndex)) {
                if (newBinding) newBinding->destroy();
                return 0;
            }

            // This will either be a value type sub-reference or an alias to a value-type sub-reference not both
            Q_ASSERT(valueTypeIndex == -1 || aValueTypeIndex == -1);
            return setBindingNoEnable(aObject, aCoreIndex, (valueTypeIndex == -1)?aValueTypeIndex:valueTypeIndex,
                                      newBinding);
        }
    }

    if (data && data->hasBindingBit(coreIndex)) {
        binding = data->bindings;

        while (binding && binding->propertyIndex() != coreIndex) 
            binding = binding->m_nextBinding;
    }

    int index = coreIndex;
    if (valueTypeIndex != -1)
        index |= (valueTypeIndex << 24);

    if (binding && valueTypeIndex != -1 && binding->bindingType() == QDeclarativeAbstractBinding::ValueTypeProxy) 
        binding = static_cast<QDeclarativeValueTypeProxyBinding *>(binding)->binding(index);

    if (binding) 
        binding->removeFromObject();

    if (newBinding) 
        newBinding->addToObject(object, index);

    return binding;
}

/*!
    Returns the expression associated with this signal property, or 0 if no 
    signal expression exists.
*/
QDeclarativeExpression *
QDeclarativePropertyPrivate::signalExpression(const QDeclarativeProperty &that)
{
    if (!(that.type() & QDeclarativeProperty::SignalProperty))
        return 0;

    const QObjectList &children = that.d->object->children();
    
    for (int ii = 0; ii < children.count(); ++ii) {
        QObject *child = children.at(ii);

        QDeclarativeBoundSignal *signal = QDeclarativeBoundSignal::cast(child);
        if (signal && signal->index() == that.index()) 
            return signal->expression();
    }

    return 0;
}

/*!
    Set the signal expression associated with this signal property to \a expr.
    Returns the existing signal expression (if any), otherwise 0.

    Ownership of \a expr transfers to QML.  Ownership of the return value is
    assumed by the caller.
*/
QDeclarativeExpression *
QDeclarativePropertyPrivate::setSignalExpression(const QDeclarativeProperty &that,
                                                     QDeclarativeExpression *expr) 
{
    if (!(that.type() & QDeclarativeProperty::SignalProperty)) {
        delete expr;
        return 0;
    }

    const QObjectList &children = that.d->object->children();
    
    for (int ii = 0; ii < children.count(); ++ii) {
        QObject *child = children.at(ii);

        QDeclarativeBoundSignal *signal = QDeclarativeBoundSignal::cast(child);
        if (signal && signal->index() == that.index()) 
            return signal->setExpression(expr);
    }

    if (expr) {
        QDeclarativeBoundSignal *signal = new QDeclarativeBoundSignal(that.d->object, that.method(), that.d->object);
        return signal->setExpression(expr);
    } else {
        return 0;
    }
}

/*!
    Returns the property value.
*/
QVariant QDeclarativeProperty::read() const
{
    if (!d)
        return QVariant();
    if (!d->object)
        return QVariant();

    if (type() & SignalProperty) {

        return QVariant();

    } else if (type() & Property) {

        return d->readValueProperty();

    }
    return QVariant();
}

/*!
Return the \a name property value of \a object.  This method is equivalent to:
\code
    QDeclarativeProperty p(object, name);
    p.read();
\endcode
*/
QVariant QDeclarativeProperty::read(QObject *object, const QString &name)
{
    QDeclarativeProperty p(object, name);
    return p.read();
}

/*!
  Return the \a name property value of \a object using the
  \l{QDeclarativeContext} {context} \a ctxt.  This method is
  equivalent to:

  \code
    QDeclarativeProperty p(object, name, context);
    p.read();
  \endcode
*/
QVariant QDeclarativeProperty::read(QObject *object, const QString &name, QDeclarativeContext *ctxt)
{
    QDeclarativeProperty p(object, name, ctxt);
    return p.read();
}

/*!
  
  Return the \a name property value of \a object using the environment
  for instantiating QML components that is provided by \a engine. .
  This method is equivalent to:

  \code
    QDeclarativeProperty p(object, name, engine);
    p.read();
  \endcode
*/
QVariant QDeclarativeProperty::read(QObject *object, const QString &name, QDeclarativeEngine *engine)
{
    QDeclarativeProperty p(object, name, engine);
    return p.read();
}

QVariant QDeclarativePropertyPrivate::readValueProperty()
{
    if (isValueType()) {

        QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(context);
        QDeclarativeValueType *valueType = 0;
        if (ep) valueType = ep->valueTypes[core.propType];
        else valueType = QDeclarativeValueTypeFactory::valueType(core.propType);
        Q_ASSERT(valueType);

        valueType->read(object, core.coreIndex);

        QVariant rv =
            valueType->metaObject()->property(this->valueType.valueTypeCoreIdx).read(valueType);

        if (!ep) delete valueType;
        return rv;

    } else if (core.flags & QDeclarativePropertyCache::Data::IsQList) {

        QDeclarativeListProperty<QObject> prop;
        void *args[] = { &prop, 0 };
        QMetaObject::metacall(object, QMetaObject::ReadProperty, core.coreIndex, args);
        return QVariant::fromValue(QDeclarativeListReferencePrivate::init(prop, core.propType, engine)); 

    } else if (core.flags & QDeclarativePropertyCache::Data::IsQObjectDerived) {

        QObject *rv = 0;
        void *args[] = { &rv, 0 };
        QMetaObject::metacall(object, QMetaObject::ReadProperty, core.coreIndex, args);
        return QVariant::fromValue(rv);

    } else {

        return object->metaObject()->property(core.coreIndex).read(object.data());

    }
}

//writeEnumProperty MIRRORS the relelvant bit of QMetaProperty::write AND MUST BE KEPT IN SYNC!
bool QDeclarativePropertyPrivate::writeEnumProperty(const QMetaProperty &prop, int idx, QObject *object, const QVariant &value, int flags)
{
    if (!object || !prop.isWritable())
        return false;

    QVariant v = value;
    if (prop.isEnumType()) {
        QMetaEnum menum = prop.enumerator();
        if (v.userType() == QVariant::String
#ifdef QT3_SUPPORT
            || v.userType() == QVariant::CString
#endif
            ) {
            if (prop.isFlagType())
                v = QVariant(menum.keysToValue(value.toByteArray()));
            else
                v = QVariant(menum.keyToValue(value.toByteArray()));
        } else if (v.userType() != QVariant::Int && v.userType() != QVariant::UInt) {
            int enumMetaTypeId = QMetaType::type(QByteArray(menum.scope()) + "::" + menum.name());
            if ((enumMetaTypeId == 0) || (v.userType() != enumMetaTypeId) || !v.constData())
                return false;
            v = QVariant(*reinterpret_cast<const int *>(v.constData()));
        }
        v.convert(QVariant::Int);
    }

    // the status variable is changed by qt_metacall to indicate what it did
    // this feature is currently only used by QtDBus and should not be depended
    // upon. Don't change it without looking into QDBusAbstractInterface first
    // -1 (unchanged): normal qt_metacall, result stored in argv[0]
    // changed: result stored directly in value, return the value of status
    int status = -1;
    void *argv[] = { v.data(), &v, &status, &flags };
    QMetaObject::metacall(object, QMetaObject::WriteProperty, idx, argv);
    return status;
}

bool QDeclarativePropertyPrivate::writeValueProperty(const QVariant &value, WriteFlags flags)
{
    // Remove any existing bindings on this property
    if (!(flags & DontRemoveBinding) &&
        (type() & QDeclarativeProperty::Property) && object) {
        QDeclarativeAbstractBinding *binding = setBinding(object, core.coreIndex,
                                                          valueType.valueTypeCoreIdx, 0, flags);
        if (binding) binding->destroy();
    }

    bool rv = false;
    if (isValueType()) {
        QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(context);

        QDeclarativeValueType *writeBack = 0;
        if (ep) {
            writeBack = ep->valueTypes[core.propType];
        } else {
            writeBack = QDeclarativeValueTypeFactory::valueType(core.propType);
        }

        writeBack->read(object, core.coreIndex);

        QDeclarativePropertyCache::Data data = core;
        data.flags = valueType.flags;
        data.coreIndex = valueType.valueTypeCoreIdx;
        data.propType = valueType.valueTypePropType;
        rv = write(writeBack, data, value, context, flags);

        writeBack->write(object, core.coreIndex, flags);
        if (!ep) delete writeBack;

    } else {

        rv = write(object, core, value, context, flags);

    }

    return rv;
}

bool QDeclarativePropertyPrivate::write(QObject *object, const QDeclarativePropertyCache::Data &property, 
                                            const QVariant &value, QDeclarativeContextData *context, 
                                            WriteFlags flags)
{
    int coreIdx = property.coreIndex;
    int status = -1;    //for dbus

    if (property.flags & QDeclarativePropertyCache::Data::IsEnumType) {
        QMetaProperty prop = object->metaObject()->property(property.coreIndex);
        QVariant v = value;
        // Enum values come through the script engine as doubles
        if (value.userType() == QVariant::Double) { 
            double integral;
            double fractional = modf(value.toDouble(), &integral);
            if (qFuzzyIsNull(fractional))
                v.convert(QVariant::Int);
        }
        return writeEnumProperty(prop, coreIdx, object, v, flags);
    }

    int propertyType = property.propType;
    int variantType = value.userType();

    QDeclarativeEnginePrivate *enginePriv = QDeclarativeEnginePrivate::get(context);

    if (propertyType == QVariant::Url) {

        QUrl u;
        bool found = false;
        if (variantType == QVariant::Url) {
            u = value.toUrl();
            found = true;
        } else if (variantType == QVariant::ByteArray) {
            u = QUrl(QString::fromUtf8(value.toByteArray()));
            found = true;
        } else if (variantType == QVariant::String) {
            u = QUrl(value.toString());
            found = true;
        }

        if (!found)
            return false;

        if (context && u.isRelative() && !u.isEmpty())
            u = context->resolvedUrl(u);
        int status = -1;
        void *argv[] = { &u, 0, &status, &flags };
        QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, argv);

    } else if (variantType == propertyType) {

        void *a[] = { (void *)value.constData(), 0, &status, &flags };
        QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, a);

    } else if (qMetaTypeId<QVariant>() == propertyType) {

        void *a[] = { (void *)&value, 0, &status, &flags };
        QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, a);

    } else if (property.flags & QDeclarativePropertyCache::Data::IsQObjectDerived) {

        const QMetaObject *valMo = rawMetaObjectForType(enginePriv, value.userType());
        
        if (!valMo)
            return false;

        QObject *o = *(QObject **)value.constData();
        const QMetaObject *propMo = rawMetaObjectForType(enginePriv, propertyType);

        if (o) valMo = o->metaObject();

        if (canConvert(valMo, propMo)) {
            void *args[] = { &o, 0, &status, &flags };
            QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, 
                                  args);
        } else if (!o && canConvert(propMo, valMo)) {
            // In the case of a null QObject, we assign the null if there is 
            // any change that the null variant type could be up or down cast to 
            // the property type.
            void *args[] = { &o, 0, &status, &flags };
            QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, 
                                  args);
        } else {
            return false;
        }

    } else if (property.flags & QDeclarativePropertyCache::Data::IsQList) {

        const QMetaObject *listType = 0;
        if (enginePriv) {
            listType = enginePriv->rawMetaObjectForType(enginePriv->listType(property.propType));
        } else {
            QDeclarativeType *type = QDeclarativeMetaType::qmlType(QDeclarativeMetaType::listType(property.propType));
            if (!type) return false;
            listType = type->baseMetaObject();
        }
        if (!listType) return false;

        QDeclarativeListProperty<void> prop;
        void *args[] = { &prop, 0 };
        QMetaObject::metacall(object, QMetaObject::ReadProperty, coreIdx, args);

        if (!prop.clear) return false;

        prop.clear(&prop);

        if (value.userType() == qMetaTypeId<QList<QObject *> >()) {
            const QList<QObject *> &list = qvariant_cast<QList<QObject *> >(value);

            for (int ii = 0; ii < list.count(); ++ii) {
                QObject *o = list.at(ii);
                if (o && !canConvert(o->metaObject(), listType))
                    o = 0;
                prop.append(&prop, (void *)o);
            }
        } else {
            QObject *o = enginePriv?enginePriv->toQObject(value):QDeclarativeMetaType::toQObject(value);
            if (o && !canConvert(o->metaObject(), listType))
                o = 0;
            prop.append(&prop, (void *)o);
        }

    } else {
        Q_ASSERT(variantType != propertyType);

        bool ok = false;
        QVariant v;
        if (variantType == QVariant::String)
            v = QDeclarativeStringConverters::variantFromString(value.toString(), propertyType, &ok);
        if (!ok) {
            v = value;
            if (v.convert((QVariant::Type)propertyType)) {
                ok = true;
            } else if ((uint)propertyType >= QVariant::UserType && variantType == QVariant::String) {
                QDeclarativeMetaType::StringConverter con = QDeclarativeMetaType::customStringConverter(propertyType);
                if (con) {
                    v = con(value.toString());
                    if (v.userType() == propertyType)
                        ok = true;
                }
            }
        }
        if (ok) {
            void *a[] = { (void *)v.constData(), 0, &status, &flags};
            QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, a);
        } else {
            return false;
        }
    }

    return true;
}

const QMetaObject *QDeclarativePropertyPrivate::rawMetaObjectForType(QDeclarativeEnginePrivate *engine, int userType)
{
    if (engine) {
        return engine->rawMetaObjectForType(userType);
    } else {
        QDeclarativeType *type = QDeclarativeMetaType::qmlType(userType);
        return type?type->baseMetaObject():0;
    }
}

/*!
    Sets the property value to \a value and returns true.
    Returns false if the property can't be set because the
    \a value is the wrong type, for example.
 */
bool QDeclarativeProperty::write(const QVariant &value) const
{
    return QDeclarativePropertyPrivate::write(*this, value, 0);
}

/*!
  Writes \a value to the \a name property of \a object.  This method
  is equivalent to:

  \code
    QDeclarativeProperty p(object, name);
    p.write(value);
  \endcode
*/
bool QDeclarativeProperty::write(QObject *object, const QString &name, const QVariant &value)
{
    QDeclarativeProperty p(object, name);
    return p.write(value);
}

/*!
  Writes \a value to the \a name property of \a object using the
  \l{QDeclarativeContext} {context} \a ctxt.  This method is
  equivalent to:

  \code
    QDeclarativeProperty p(object, name, ctxt);
    p.write(value);
  \endcode
*/
bool QDeclarativeProperty::write(QObject *object,
                                 const QString &name,
                                 const QVariant &value, 
                                 QDeclarativeContext *ctxt)
{
    QDeclarativeProperty p(object, name, ctxt);
    return p.write(value);
}

/*!
  
  Writes \a value to the \a name property of \a object using the
  environment for instantiating QML components that is provided by
  \a engine.  This method is equivalent to:

  \code
    QDeclarativeProperty p(object, name, engine);
    p.write(value);
  \endcode
*/
bool QDeclarativeProperty::write(QObject *object, const QString &name, const QVariant &value, 
                                 QDeclarativeEngine *engine)
{
    QDeclarativeProperty p(object, name, engine);
    return p.write(value);
}

/*!
    Resets the property and returns true if the property is
    resettable.  If the property is not resettable, nothing happens
    and false is returned.
*/
bool QDeclarativeProperty::reset() const
{
    if (isResettable()) {
        void *args[] = { 0 };
        QMetaObject::metacall(d->object, QMetaObject::ResetProperty, d->core.coreIndex, args);
        return true;
    } else {
        return false;
    }
}

bool QDeclarativePropertyPrivate::write(const QDeclarativeProperty &that,
                                            const QVariant &value, WriteFlags flags) 
{
    if (!that.d)
        return false;
    if (that.d->object && that.type() & QDeclarativeProperty::Property && 
        that.d->core.isValid() && that.isWritable()) 
        return that.d->writeValueProperty(value, flags);
    else 
        return false;
}

/*!
    Returns true if the property has a change notifier signal, otherwise false.
*/
bool QDeclarativeProperty::hasNotifySignal() const
{
    if (type() & Property && d->object) {
        return d->object->metaObject()->property(d->core.coreIndex).hasNotifySignal();
    }
    return false;
}

/*!
    Returns true if the property needs a change notifier signal for bindings
    to remain upto date, false otherwise.

    Some properties, such as attached properties or those whose value never 
    changes, do not require a change notifier.
*/
bool QDeclarativeProperty::needsNotifySignal() const
{
    return type() & Property && !property().isConstant();
}

/*!
    Connects the property's change notifier signal to the
    specified \a method of the \a dest object and returns
    true. Returns false if this metaproperty does not
    represent a regular Qt property or if it has no
    change notifier signal, or if the \a dest object does
    not have the specified \a method.
*/
bool QDeclarativeProperty::connectNotifySignal(QObject *dest, int method) const
{
    if (!(type() & Property) || !d->object)
        return false;

    QMetaProperty prop = d->object->metaObject()->property(d->core.coreIndex);
    if (prop.hasNotifySignal()) {
        return QDeclarativePropertyPrivate::connect(d->object, prop.notifySignalIndex(), dest, method, Qt::DirectConnection);
    } else {
        return false;
    }
}

/*!
    Connects the property's change notifier signal to the
    specified \a slot of the \a dest object and returns
    true. Returns false if this metaproperty does not
    represent a regular Qt property or if it has no
    change notifier signal, or if the \a dest object does
    not have the specified \a slot.
*/
bool QDeclarativeProperty::connectNotifySignal(QObject *dest, const char *slot) const
{
    if (!(type() & Property) || !d->object)
        return false;

    QMetaProperty prop = d->object->metaObject()->property(d->core.coreIndex);
    if (prop.hasNotifySignal()) {
        QByteArray signal(QByteArray("2") + prop.notifySignal().signature());
        return QObject::connect(d->object, signal.constData(), dest, slot);
    } else  {
        return false;
    }
}

/*!
    Return the Qt metaobject index of the property.
*/
int QDeclarativeProperty::index() const
{
    return d ? d->core.coreIndex : -1;
}

int QDeclarativePropertyPrivate::valueTypeCoreIndex(const QDeclarativeProperty &that)
{
    return that.d ? that.d->valueType.valueTypeCoreIdx : -1;
}

/*!
    Returns the "property index" for use in bindings.  The top 8 bits are the value type
    offset, and 0 otherwise.  The bottom 24-bits are the regular property index.
*/
int QDeclarativePropertyPrivate::bindingIndex(const QDeclarativeProperty &that)
{
    if (!that.d)
        return -1;
    int rv = that.d->core.coreIndex;
    if (rv != -1 && that.d->valueType.valueTypeCoreIdx != -1)
        rv = rv | (that.d->valueType.valueTypeCoreIdx << 24);
    return rv;
}

struct SerializedData {
    bool isValueType;
    QDeclarativePropertyCache::Data core;
};

struct ValueTypeSerializedData : public SerializedData {
    QDeclarativePropertyCache::ValueTypeData valueType;
};

QByteArray QDeclarativePropertyPrivate::saveValueType(const QMetaObject *metaObject, int index, 
                                                 const QMetaObject *subObject, int subIndex)
{
    QMetaProperty prop = metaObject->property(index);
    QMetaProperty subProp = subObject->property(subIndex);

    ValueTypeSerializedData sd;
    sd.isValueType = true;
    sd.core.load(metaObject->property(index));
    sd.valueType.flags = QDeclarativePropertyCache::Data::flagsForProperty(subProp);
    sd.valueType.valueTypeCoreIdx = subIndex;
    sd.valueType.valueTypePropType = subProp.userType();

    QByteArray rv((const char *)&sd, sizeof(sd));

    return rv;
}

QByteArray QDeclarativePropertyPrivate::saveProperty(const QMetaObject *metaObject, int index)
{
    SerializedData sd;
    sd.isValueType = false;
    sd.core.load(metaObject->property(index));

    QByteArray rv((const char *)&sd, sizeof(sd));
    return rv;
}

QDeclarativeProperty 
QDeclarativePropertyPrivate::restore(const QByteArray &data, QObject *object, QDeclarativeContextData *ctxt)
{
    QDeclarativeProperty prop;

    if (data.isEmpty())
        return prop;

    const SerializedData *sd = (const SerializedData *)data.constData();
    if (sd->isValueType) {
        const ValueTypeSerializedData *vt = (const ValueTypeSerializedData *)sd;
        return restore(vt->core, vt->valueType, object, ctxt);
    } else {
        QDeclarativePropertyCache::ValueTypeData data;
        return restore(sd->core, data, object, ctxt);
    }
}

QDeclarativeProperty
QDeclarativePropertyPrivate::restore(const QDeclarativePropertyCache::Data &data, const QDeclarativePropertyCache::ValueTypeData &valueType, QObject *object, QDeclarativeContextData *ctxt)
{
    QDeclarativeProperty prop;

    prop.d = new QDeclarativePropertyPrivate;
    prop.d->object = object;
    prop.d->context = ctxt;
    prop.d->engine = ctxt->engine;

    prop.d->core = data;
    prop.d->valueType = valueType;

    return prop;
}

/*!
    Returns true if lhs and rhs refer to the same metaobject data
*/
bool QDeclarativePropertyPrivate::equal(const QMetaObject *lhs, const QMetaObject *rhs)
{
    return lhs == rhs || (1 && lhs && rhs && lhs->d.stringdata == rhs->d.stringdata);
}

/*!
    Returns true if from inherits to.
*/
bool QDeclarativePropertyPrivate::canConvert(const QMetaObject *from, const QMetaObject *to)
{
    if (from && to == &QObject::staticMetaObject)
        return true;

    while (from) {
        if (equal(from, to))
            return true;
        from = from->superClass();
    }
    
    return false;
}

/*!
    Return the signal corresponding to \a name
*/
QMetaMethod QDeclarativePropertyPrivate::findSignalByName(const QMetaObject *mo, const QByteArray &name)
{
    Q_ASSERT(mo);
    int methods = mo->methodCount();
    for (int ii = methods - 1; ii >= 2; --ii) { // >= 2 to block the destroyed signal
        QMetaMethod method = mo->method(ii);
        QByteArray methodName = method.signature();
        int idx = methodName.indexOf('(');
        methodName = methodName.left(idx);

        if (methodName == name)
            return method;
    }

    // If no signal is found, but the signal is of the form "onBlahChanged",
    // return the notify signal for the property "Blah"
    if (name.endsWith("Changed")) {
        QByteArray propName = name.mid(0, name.length() - 7);
        int propIdx = mo->indexOfProperty(propName.constData());
        if (propIdx >= 0) {
            QMetaProperty prop = mo->property(propIdx);
            if (prop.hasNotifySignal())
                return prop.notifySignal();
        }
    }

    return QMetaMethod();
}

static inline int QMetaObject_methods(const QMetaObject *metaObject)
{
    struct Private
    {
        int revision;
        int className;
        int classInfoCount, classInfoData;
        int methodCount, methodData;
        int propertyCount, propertyData;
    };

    return reinterpret_cast<const Private *>(metaObject->d.data)->methodCount;
}

static inline int QMetaObject_properties(const QMetaObject *metaObject)
{
    struct Private
    {
        int revision;
        int className;
        int classInfoCount, classInfoData;
        int methodCount, methodData;
        int propertyCount, propertyData;
    };

    return reinterpret_cast<const Private *>(metaObject->d.data)->propertyCount;
}

static inline void flush_vme_signal(const QObject *object, int index)
{
    QDeclarativeData *data = static_cast<QDeclarativeData *>(QObjectPrivate::get(const_cast<QObject *>(object))->declarativeData);
    if (data && data->propertyCache) {
        QDeclarativePropertyCache::Data *property = data->propertyCache->method(index);

        if (property && property->flags & QDeclarativePropertyCache::Data::IsVMESignal) {
            const QMetaObject *metaObject = object->metaObject();
            int methodOffset = metaObject->methodOffset();

            while (methodOffset > index) {
                metaObject = metaObject->d.superdata;
                methodOffset -= QMetaObject_methods(metaObject);
            }

            QDeclarativeVMEMetaObject *vme = 
                static_cast<QDeclarativeVMEMetaObject *>(const_cast<QMetaObject *>(metaObject));

            vme->connectAliasSignal(index);
        }
    }
}

/*!
Connect \a sender \a signal_index to \a receiver \a method_index with the specified 
\a type and \a types.  This behaves identically to QMetaObject::connect() except that
it connects any lazy "proxy" signal connections set up by QML.

It is possible that this logic should be moved to QMetaObject::connect().
*/
bool QDeclarativePropertyPrivate::connect(const QObject *sender, int signal_index,
                                          const QObject *receiver, int method_index,
                                          int type, int *types)
{
    flush_vme_signal(sender, signal_index);
    flush_vme_signal(receiver, method_index);

    return QMetaObject::connect(sender, signal_index, receiver, method_index, type, types);
}

/*!
Return \a metaObject's [super] meta object that provides data for \a property.
*/
const QMetaObject *QDeclarativePropertyPrivate::metaObjectForProperty(const QMetaObject *metaObject, int property)
{
    int propertyOffset = metaObject->propertyOffset();

    while (propertyOffset > property) {
        metaObject = metaObject->d.superdata;
        propertyOffset -= QMetaObject_properties(metaObject);
    }

    return metaObject;
}

QT_END_NAMESPACE