src/declarative/qml/qdeclarativevmemetaobject.cpp

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  41
  42 #include "qdeclarativevmemetaobject_p.h"
  43
  44
  45 #include "qdeclarative.h"
  46 #include <private/qdeclarativerefcount_p.h>
  47 #include "qdeclarativeexpression.h"
  48 #include "qdeclarativeexpression_p.h"
  49 #include "qdeclarativecontext_p.h"
  50 #include "qdeclarativebinding_p.h"
  51 #include "qdeclarativepropertyvalueinterceptor_p.h"
  52
  53 #include <private/qv8variantresource_p.h>
  54
  55 Q_DECLARE_METATYPE(QJSValue);
  56
  57 QT_BEGIN_NAMESPACE
  58
  59 class QDeclarativeVMEVariant
  60 {
  61 public:
  62     inline QDeclarativeVMEVariant();
  63     inline ~QDeclarativeVMEVariant();
  64
  65     inline const void *dataPtr() const;
  66     inline void *dataPtr();
  67     inline int dataType() const;
  68
  69     inline QObject *asQObject();
  70     inline const QVariant &asQVariant();
  71     inline int asInt();
  72     inline bool asBool();
  73     inline double asDouble();
  74     inline const QString &asQString();
  75     inline const QUrl &asQUrl();
  76     inline const QColor &asQColor();
  77     inline const QTime &asQTime();
  78     inline const QDate &asQDate();
  79     inline const QDateTime &asQDateTime();
  80     inline const QJSValue &asQJSValue();
  81
  82     inline void setValue(QObject *);
  83     inline void setValue(const QVariant &);
  84     inline void setValue(int);
  85     inline void setValue(bool);
  86     inline void setValue(double);
  87     inline void setValue(const QString &);
  88     inline void setValue(const QUrl &);
  89     inline void setValue(const QColor &);
  90     inline void setValue(const QTime &);
  91     inline void setValue(const QDate &);
  92     inline void setValue(const QDateTime &);
  93     inline void setValue(const QJSValue &);
  94 private:
  95     int type;
  96     void *data[4]; // Large enough to hold all types
  97
  98     inline void cleanup();
  99 };
 100
 101 class QDeclarativeVMEMetaObjectEndpoint : public QDeclarativeNotifierEndpoint
 102 {
 103 public:
 104     QDeclarativeVMEMetaObjectEndpoint();
 105     static void vmecallback(QDeclarativeNotifierEndpoint *);
 106     void tryConnect();
 107
 108     QFlagPointer<QDeclarativeVMEMetaObject> metaObject;
 109 };
 110
 111
 112 QDeclarativeVMEVariant::QDeclarativeVMEVariant()
 113 : type(QVariant::Invalid)
 114 {
 115 }
 116
 117 QDeclarativeVMEVariant::~QDeclarativeVMEVariant()
 118 {
 119     cleanup();
 120 }
 121
 122 void QDeclarativeVMEVariant::cleanup()
 123 {
 124     if (type == QVariant::Invalid) {
 125     } else if (type == QMetaType::Int ||
 126                type == QMetaType::Bool ||
 127                type == QMetaType::Double) {
 128         type = QVariant::Invalid;
 129     } else if (type == QMetaType::QObjectStar) {
 130         ((QDeclarativeGuard<QObject>*)dataPtr())->~QDeclarativeGuard<QObject>();
 131         type = QVariant::Invalid;
 132     } else if (type == QMetaType::QString) {
 133         ((QString *)dataPtr())->~QString();
 134         type = QVariant::Invalid;
 135     } else if (type == QMetaType::QUrl) {
 136         ((QUrl *)dataPtr())->~QUrl();
 137         type = QVariant::Invalid;
 138     } else if (type == QMetaType::QColor) {
 139         ((QColor *)dataPtr())->~QColor();
 140         type = QVariant::Invalid;
 141     } else if (type == QMetaType::QTime) {
 142         ((QTime *)dataPtr())->~QTime();
 143         type = QVariant::Invalid;
 144     } else if (type == QMetaType::QDate) {
 145         ((QDate *)dataPtr())->~QDate();
 146         type = QVariant::Invalid;
 147     } else if (type == QMetaType::QDateTime) {
 148         ((QDateTime *)dataPtr())->~QDateTime();
 149         type = QVariant::Invalid;
 150     } else if (type == qMetaTypeId<QVariant>()) {
 151         ((QVariant *)dataPtr())->~QVariant();
 152         type = QVariant::Invalid;
 153     } else if (type == qMetaTypeId<QJSValue>()) {
 154         ((QJSValue *)dataPtr())->~QJSValue();
 155         type = QVariant::Invalid;
 156     }
 157
 158 }
 159
 160 int QDeclarativeVMEVariant::dataType() const
 161 {
 162     return type;
 163 }
 164
 165 const void *QDeclarativeVMEVariant::dataPtr() const
 166 {
 167     return &data;
 168 }
 169
 170 void *QDeclarativeVMEVariant::dataPtr()
 171 {
 172     return &data;
 173 }
 174
 175 QObject *QDeclarativeVMEVariant::asQObject()
 176 {
 177     if (type != QMetaType::QObjectStar)
 178         setValue((QObject *)0);
 179
 180     return *(QDeclarativeGuard<QObject> *)(dataPtr());
 181 }
 182
 183 const QVariant &QDeclarativeVMEVariant::asQVariant()
 184 {
 185     if (type != QMetaType::QVariant)
 186         setValue(QVariant());
 187
 188     return *(QVariant *)(dataPtr());
 189 }
 190
 191 int QDeclarativeVMEVariant::asInt()
 192 {
 193     if (type != QMetaType::Int)
 194         setValue(int(0));
 195
 196     return *(int *)(dataPtr());
 197 }
 198
 199 bool QDeclarativeVMEVariant::asBool()
 200 {
 201     if (type != QMetaType::Bool)
 202         setValue(bool(false));
 203
 204     return *(bool *)(dataPtr());
 205 }
 206
 207 double QDeclarativeVMEVariant::asDouble()
 208 {
 209     if (type != QMetaType::Double)
 210         setValue(double(0));
 211
 212     return *(double *)(dataPtr());
 213 }
 214
 215 const QString &QDeclarativeVMEVariant::asQString()
 216 {
 217     if (type != QMetaType::QString)
 218         setValue(QString());
 219
 220     return *(QString *)(dataPtr());
 221 }
 222
 223 const QUrl &QDeclarativeVMEVariant::asQUrl()
 224 {
 225     if (type != QMetaType::QUrl)
 226         setValue(QUrl());
 227
 228     return *(QUrl *)(dataPtr());
 229 }
 230
 231 const QColor &QDeclarativeVMEVariant::asQColor()
 232 {
 233     if (type != QMetaType::QColor)
 234         setValue(QColor());
 235
 236     return *(QColor *)(dataPtr());
 237 }
 238
 239 const QTime &QDeclarativeVMEVariant::asQTime()
 240 {
 241     if (type != QMetaType::QTime)
 242         setValue(QTime());
 243
 244     return *(QTime *)(dataPtr());
 245 }
 246
 247 const QDate &QDeclarativeVMEVariant::asQDate()
 248 {
 249     if (type != QMetaType::QDate)
 250         setValue(QDate());
 251
 252     return *(QDate *)(dataPtr());
 253 }
 254
 255 const QDateTime &QDeclarativeVMEVariant::asQDateTime()
 256 {
 257     if (type != QMetaType::QDateTime)
 258         setValue(QDateTime());
 259
 260     return *(QDateTime *)(dataPtr());
 261 }
 262
 263 const QJSValue &QDeclarativeVMEVariant::asQJSValue()
 264 {
 265     if (type != qMetaTypeId<QJSValue>())
 266         setValue(QJSValue());
 267
 268     return *(QJSValue *)(dataPtr());
 269 }
 270
 271 void QDeclarativeVMEVariant::setValue(QObject *v)
 272 {
 273     if (type != QMetaType::QObjectStar) {
 274         cleanup();
 275         type = QMetaType::QObjectStar;
 276         new (dataPtr()) QDeclarativeGuard<QObject>();
 277     }
 278     *(QDeclarativeGuard<QObject>*)(dataPtr()) = v;
 279 }
 280
 281 void QDeclarativeVMEVariant::setValue(const QVariant &v)
 282 {
 283     if (type != qMetaTypeId<QVariant>()) {
 284         cleanup();
 285         type = qMetaTypeId<QVariant>();
 286         new (dataPtr()) QVariant(v);
 287     } else {
 288         *(QVariant *)(dataPtr()) = v;
 289     }
 290 }
 291
 292 void QDeclarativeVMEVariant::setValue(int v)
 293 {
 294     if (type != QMetaType::Int) {
 295         cleanup();
 296         type = QMetaType::Int;
 297     }
 298     *(int *)(dataPtr()) = v;
 299 }
 300
 301 void QDeclarativeVMEVariant::setValue(bool v)
 302 {
 303     if (type != QMetaType::Bool) {
 304         cleanup();
 305         type = QMetaType::Bool;
 306     }
 307     *(bool *)(dataPtr()) = v;
 308 }
 309
 310 void QDeclarativeVMEVariant::setValue(double v)
 311 {
 312     if (type != QMetaType::Double) {
 313         cleanup();
 314         type = QMetaType::Double;
 315     }
 316     *(double *)(dataPtr()) = v;
 317 }
 318
 319 void QDeclarativeVMEVariant::setValue(const QString &v)
 320 {
 321     if (type != QMetaType::QString) {
 322         cleanup();
 323         type = QMetaType::QString;
 324         new (dataPtr()) QString(v);
 325     } else {
 326         *(QString *)(dataPtr()) = v;
 327     }
 328 }
 329
 330 void QDeclarativeVMEVariant::setValue(const QUrl &v)
 331 {
 332     if (type != QMetaType::QUrl) {
 333         cleanup();
 334         type = QMetaType::QUrl;
 335         new (dataPtr()) QUrl(v);
 336     } else {
 337         *(QUrl *)(dataPtr()) = v;
 338     }
 339 }
 340
 341 void QDeclarativeVMEVariant::setValue(const QColor &v)
 342 {
 343     if (type != QMetaType::QColor) {
 344         cleanup();
 345         type = QMetaType::QColor;
 346         new (dataPtr()) QColor(v);
 347     } else {
 348         *(QColor *)(dataPtr()) = v;
 349     }
 350 }
 351
 352 void QDeclarativeVMEVariant::setValue(const QTime &v)
 353 {
 354     if (type != QMetaType::QTime) {
 355         cleanup();
 356         type = QMetaType::QTime;
 357         new (dataPtr()) QTime(v);
 358     } else {
 359         *(QTime *)(dataPtr()) = v;
 360     }
 361 }
 362
 363 void QDeclarativeVMEVariant::setValue(const QDate &v)
 364 {
 365     if (type != QMetaType::QDate) {
 366         cleanup();
 367         type = QMetaType::QDate;
 368         new (dataPtr()) QDate(v);
 369     } else {
 370         *(QDate *)(dataPtr()) = v;
 371     }
 372 }
 373
 374 void QDeclarativeVMEVariant::setValue(const QDateTime &v)
 375 {
 376     if (type != QMetaType::QDateTime) {
 377         cleanup();
 378         type = QMetaType::QDateTime;
 379         new (dataPtr()) QDateTime(v);
 380     } else {
 381         *(QDateTime *)(dataPtr()) = v;
 382     }
 383 }
 384
 385 void QDeclarativeVMEVariant::setValue(const QJSValue &v)
 386 {
 387     if (type != qMetaTypeId<QJSValue>()) {
 388         cleanup();
 389         type = qMetaTypeId<QJSValue>();
 390         new (dataPtr()) QJSValue(v);
 391     } else {
 392         *(QJSValue *)(dataPtr()) = v;
 393     }
 394 }
 395
 396 QDeclarativeVMEMetaObjectEndpoint::QDeclarativeVMEMetaObjectEndpoint()
 397 {
 398     callback = &vmecallback;
 399 }
 400
 401 void QDeclarativeVMEMetaObjectEndpoint::vmecallback(QDeclarativeNotifierEndpoint *e)
 402 {
 403     QDeclarativeVMEMetaObjectEndpoint *vmee = static_cast<QDeclarativeVMEMetaObjectEndpoint*>(e);
 404     vmee->tryConnect();
 405 }
 406
 407 void QDeclarativeVMEMetaObjectEndpoint::tryConnect()
 408 {
 409     if (metaObject.flag())
 410         return;
 411
 412     int aliasId = this - metaObject->aliasEndpoints;
 413
 414     QDeclarativeVMEMetaData::AliasData *d = metaObject->metaData->aliasData() + aliasId;
 415     if (!d->isObjectAlias()) {
 416         QDeclarativeContextData *ctxt = metaObject->ctxt;
 417         QObject *target = ctxt->idValues[d->contextIdx].data();
 418         if (!target)
 419             return;
 420
 421         QMetaProperty prop = target->metaObject()->property(d->propertyIndex());
 422         if (prop.hasNotifySignal()) {
 423             int sigIdx = metaObject->methodOffset + aliasId + metaObject->metaData->propertyCount;
 424             QDeclarativePropertyPrivate::connect(target, prop.notifySignalIndex(),
 425                                                  metaObject->object, sigIdx);
 426         }
 427     }
 428
 429     metaObject.setFlag();
 430 }
 431
 432 QDeclarativeVMEMetaObject::QDeclarativeVMEMetaObject(QObject *obj,
 433                                                      const QMetaObject *other,
 434                                                      const QDeclarativeVMEMetaData *meta,
 435                                                      QDeclarativeCompiledData *cdata)
 436 : QV8GCCallback::Node(GcPrologueCallback), object(obj), compiledData(cdata),
 437   ctxt(QDeclarativeData::get(obj, true)->outerContext), metaData(meta), data(0),
 438   aliasEndpoints(0), firstVarPropertyIndex(-1), varPropertiesInitialized(false),
 439   v8methods(0), parent(0)
 440 {
 441     compiledData->addref();
 442
 443     *static_cast<QMetaObject *>(this) = *other;
 444     this->d.superdata = obj->metaObject();
 445
 446     QObjectPrivate *op = QObjectPrivate::get(obj);
 447     if (op->metaObject)
 448         parent = static_cast<QAbstractDynamicMetaObject*>(op->metaObject);
 449     op->metaObject = this;
 450
 451     propOffset = QAbstractDynamicMetaObject::propertyOffset();
 452     methodOffset = QAbstractDynamicMetaObject::methodOffset();
 453
 454     data = new QDeclarativeVMEVariant[metaData->propertyCount - metaData->varPropertyCount];
 455
 456     aConnected.resize(metaData->aliasCount);
 457     int list_type = qMetaTypeId<QDeclarativeListProperty<QObject> >();
 458
 459     // ### Optimize
 460     for (int ii = 0; ii < metaData->propertyCount - metaData->varPropertyCount; ++ii) {
 461         int t = (metaData->propertyData() + ii)->propertyType;
 462         if (t == list_type) {
 463             listProperties.append(List(methodOffset + ii));
 464             data[ii].setValue(listProperties.count() - 1);
 465         }
 466     }
 467
 468     firstVarPropertyIndex = metaData->propertyCount - metaData->varPropertyCount;
 469     if (metaData->varPropertyCount)
 470         QV8GCCallback::addGcCallbackNode(this);
 471 }
 472
 473 QDeclarativeVMEMetaObject::~QDeclarativeVMEMetaObject()
 474 {
 475     compiledData->release();
 476     delete parent;
 477     delete [] data;
 478     delete [] aliasEndpoints;
 479
 480     for (int ii = 0; v8methods && ii < metaData->methodCount; ++ii) {
 481         qPersistentDispose(v8methods[ii]);
 482     }
 483
 484     if (metaData->varPropertyCount)
 485         qPersistentDispose(varProperties); // if not weak, will not have been cleaned up by the callback.
 486 }
 487
 488 int QDeclarativeVMEMetaObject::metaCall(QMetaObject::Call c, int _id, void **a)
 489 {
 490     int id = _id;
 491     if(c == QMetaObject::WriteProperty) {
 492         int flags = *reinterpret_cast<int*>(a[3]);
 493         if (!(flags & QDeclarativePropertyPrivate::BypassInterceptor)
 494             && !aInterceptors.isEmpty()
 495             && aInterceptors.testBit(id)) {
 496             QPair<int, QDeclarativePropertyValueInterceptor*> pair = interceptors.value(id);
 497             int valueIndex = pair.first;
 498             QDeclarativePropertyValueInterceptor *vi = pair.second;
 499             int type = property(id).userType();
 500
 501             if (type != QVariant::Invalid) {
 502                 if (valueIndex != -1) {
 503                     QDeclarativeEnginePrivate *ep = ctxt?QDeclarativeEnginePrivate::get(ctxt->engine):0;
 504                     QDeclarativeValueType *valueType = 0;
 505                     if (ep) valueType = ep->valueTypes[type];
 506                     else valueType = QDeclarativeValueTypeFactory::valueType(type);
 507                     Q_ASSERT(valueType);
 508
 509                     valueType->setValue(QVariant(type, a[0]));
 510                     QMetaProperty valueProp = valueType->metaObject()->property(valueIndex);
 511                     vi->write(valueProp.read(valueType));
 512
 513                     if (!ep) delete valueType;
 514                     return -1;
 515                 } else {
 516                     vi->write(QVariant(type, a[0]));
 517                     return -1;
 518                 }
 519             }
 520         }
 521     }
 522     if (c == QMetaObject::ReadProperty || c == QMetaObject::WriteProperty || c == QMetaObject::ResetProperty) {
 523         if (id >= propOffset) {
 524             id -= propOffset;
 525
 526             if (id < metaData->propertyCount) {
 527                int t = (metaData->propertyData() + id)->propertyType;
 528                 bool needActivate = false;
 529
 530                 if (id >= firstVarPropertyIndex) {
 531                     Q_ASSERT(t == QMetaType::QVariant);
 532                     // the context can be null if accessing var properties from cpp after re-parenting an item.
 533                     QDeclarativeEnginePrivate *ep = (ctxt == 0 || ctxt->engine == 0) ? 0 : QDeclarativeEnginePrivate::get(ctxt->engine);
 534                     QV8Engine *v8e = (ep == 0) ? 0 : ep->v8engine();
 535                     if (v8e) {
 536                         v8::HandleScope handleScope;
 537                         v8::Context::Scope contextScope(v8e->context());
 538                         if (c == QMetaObject::ReadProperty) {
 539                             *reinterpret_cast<QVariant *>(a[0]) = readPropertyAsVariant(id);
 540                         } else if (c == QMetaObject::WriteProperty) {
 541                             writeProperty(id, *reinterpret_cast<QVariant *>(a[0]));
 542                         }
 543                     } else if (c == QMetaObject::ReadProperty) {
 544                         // if the context was disposed, we just return an invalid variant from read.
 545                         *reinterpret_cast<QVariant *>(a[0]) = QVariant();
 546                     }
 547
 548                 } else {
 549
 550                     if (c == QMetaObject::ReadProperty) {
 551                         switch(t) {
 552                         case QVariant::Int:
 553                             *reinterpret_cast<int *>(a[0]) = data[id].asInt();
 554                             break;
 555                         case QVariant::Bool:
 556                             *reinterpret_cast<bool *>(a[0]) = data[id].asBool();
 557                             break;
 558                         case QVariant::Double:
 559                             *reinterpret_cast<double *>(a[0]) = data[id].asDouble();
 560                             break;
 561                         case QVariant::String:
 562                             *reinterpret_cast<QString *>(a[0]) = data[id].asQString();
 563                             break;
 564                         case QVariant::Url:
 565                             *reinterpret_cast<QUrl *>(a[0]) = data[id].asQUrl();
 566                             break;
 567                         case QVariant::Color:
 568                             *reinterpret_cast<QColor *>(a[0]) = data[id].asQColor();
 569                             break;
 570                         case QVariant::Date:
 571                             *reinterpret_cast<QDate *>(a[0]) = data[id].asQDate();
 572                             break;
 573                         case QVariant::DateTime:
 574                             *reinterpret_cast<QDateTime *>(a[0]) = data[id].asQDateTime();
 575                             break;
 576                         case QMetaType::QObjectStar:
 577                             *reinterpret_cast<QObject **>(a[0]) = data[id].asQObject();
 578                             break;
 579                         case QMetaType::QVariant:
 580                             *reinterpret_cast<QVariant *>(a[0]) = readPropertyAsVariant(id);
 581                             break;
 582                         default:
 583                             break;
 584                         }
 585                         if (t == qMetaTypeId<QDeclarativeListProperty<QObject> >()) {
 586                             int listIndex = data[id].asInt();
 587                             const List *list = &listProperties.at(listIndex);
 588                             *reinterpret_cast<QDeclarativeListProperty<QObject> *>(a[0]) =
 589                                 QDeclarativeListProperty<QObject>(object, (void *)list,
 590                                                                   list_append, list_count, list_at,
 591                                                                   list_clear);
 592                         }
 593
 594                     } else if (c == QMetaObject::WriteProperty) {
 595
 596                         switch(t) {
 597                         case QVariant::Int:
 598                             needActivate = *reinterpret_cast<int *>(a[0]) != data[id].asInt();
 599                             data[id].setValue(*reinterpret_cast<int *>(a[0]));
 600                             break;
 601                         case QVariant::Bool:
 602                             needActivate = *reinterpret_cast<bool *>(a[0]) != data[id].asBool();
 603                             data[id].setValue(*reinterpret_cast<bool *>(a[0]));
 604                             break;
 605                         case QVariant::Double:
 606                             needActivate = *reinterpret_cast<double *>(a[0]) != data[id].asDouble();
 607                             data[id].setValue(*reinterpret_cast<double *>(a[0]));
 608                             break;
 609                         case QVariant::String:
 610                             needActivate = *reinterpret_cast<QString *>(a[0]) != data[id].asQString();
 611                             data[id].setValue(*reinterpret_cast<QString *>(a[0]));
 612                             break;
 613                         case QVariant::Url:
 614                             needActivate = *reinterpret_cast<QUrl *>(a[0]) != data[id].asQUrl();
 615                             data[id].setValue(*reinterpret_cast<QUrl *>(a[0]));
 616                             break;
 617                         case QVariant::Color:
 618                             needActivate = *reinterpret_cast<QColor *>(a[0]) != data[id].asQColor();
 619                             data[id].setValue(*reinterpret_cast<QColor *>(a[0]));
 620                             break;
 621                         case QVariant::Date:
 622                             needActivate = *reinterpret_cast<QDate *>(a[0]) != data[id].asQDate();
 623                             data[id].setValue(*reinterpret_cast<QDate *>(a[0]));
 624                             break;
 625                         case QVariant::DateTime:
 626                             needActivate = *reinterpret_cast<QDateTime *>(a[0]) != data[id].asQDateTime();
 627                             data[id].setValue(*reinterpret_cast<QDateTime *>(a[0]));
 628                             break;
 629                         case QMetaType::QObjectStar:
 630                             needActivate = *reinterpret_cast<QObject **>(a[0]) != data[id].asQObject();
 631                             data[id].setValue(*reinterpret_cast<QObject **>(a[0]));
 632                             break;
 633                         case QMetaType::QVariant:
 634                             writeProperty(id, *reinterpret_cast<QVariant *>(a[0]));
 635                             break;
 636                         default:
 637                             break;
 638                         }
 639                     }
 640
 641                 }
 642
 643                 if (c == QMetaObject::WriteProperty && needActivate) {
 644                     activate(object, methodOffset + id, 0);
 645                 }
 646
 647                 return -1;
 648             }
 649
 650             id -= metaData->propertyCount;
 651
 652             if (id < metaData->aliasCount) {
 653
 654                 QDeclarativeVMEMetaData::AliasData *d = metaData->aliasData() + id;
 655
 656                 if (d->flags & QML_ALIAS_FLAG_PTR && c == QMetaObject::ReadProperty)
 657                         *reinterpret_cast<void **>(a[0]) = 0;
 658
 659                 if (!ctxt) return -1;
 660
 661                 QDeclarativeContext *context = ctxt->asQDeclarativeContext();
 662                 QDeclarativeContextPrivate *ctxtPriv = QDeclarativeContextPrivate::get(context);
 663
 664                 QObject *target = ctxtPriv->data->idValues[d->contextIdx].data();
 665                 if (!target)
 666                     return -1;
 667
 668                 connectAlias(id);
 669
 670                 if (d->isObjectAlias()) {
 671                     *reinterpret_cast<QObject **>(a[0]) = target;
 672                     return -1;
 673                 }
 674
 675                 // Remove binding (if any) on write
 676                 if(c == QMetaObject::WriteProperty) {
 677                     int flags = *reinterpret_cast<int*>(a[3]);
 678                     if (flags & QDeclarativePropertyPrivate::RemoveBindingOnAliasWrite) {
 679                         QDeclarativeData *targetData = QDeclarativeData::get(target);
 680                         if (targetData && targetData->hasBindingBit(d->propertyIndex())) {
 681                             QDeclarativeAbstractBinding *binding = QDeclarativePropertyPrivate::setBinding(target, d->propertyIndex(), d->isValueTypeAlias()?d->valueTypeIndex():-1, 0);
 682                             if (binding) binding->destroy();
 683                         }
 684                     }
 685                 }
 686
 687                 if (d->isValueTypeAlias()) {
 688                     // Value type property
 689                     QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(ctxt->engine);
 690
 691                     QDeclarativeValueType *valueType = ep->valueTypes[d->valueType()];
 692                     Q_ASSERT(valueType);
 693
 694                     valueType->read(target, d->propertyIndex());
 695                     int rv = QMetaObject::metacall(valueType, c, d->valueTypeIndex(), a);
 696
 697                     if (c == QMetaObject::WriteProperty)
 698                         valueType->write(target, d->propertyIndex(), 0x00);
 699
 700                     return rv;
 701
 702                 } else {
 703                     return QMetaObject::metacall(target, c, d->propertyIndex(), a);
 704                 }
 705
 706             }
 707             return -1;
 708
 709         }
 710
 711     } else if(c == QMetaObject::InvokeMetaMethod) {
 712
 713         if (id >= methodOffset) {
 714
 715             id -= methodOffset;
 716             int plainSignals = metaData->signalCount + metaData->propertyCount +
 717                                metaData->aliasCount;
 718             if (id < plainSignals) {
 719                 QMetaObject::activate(object, _id, a);
 720                 return -1;
 721             }
 722
 723             id -= plainSignals;
 724
 725             if (id < metaData->methodCount) {
 726                 if (!ctxt->engine)
 727                     return -1; // We can't run the method
 728
 729                 QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(ctxt->engine);
 730                 ep->referenceScarceResources(); // "hold" scarce resources in memory during evaluation.
 731
 732                 v8::Handle<v8::Function> function = method(id);
 733                 QDeclarativeVMEMetaData::MethodData *data = metaData->methodData() + id;
 734
 735                 v8::HandleScope handle_scope;
 736                 v8::Context::Scope scope(ep->v8engine()->context());
 737                 v8::Handle<v8::Value> *args = 0;
 738
 739                 if (data->parameterCount) {
 740                     args = new v8::Handle<v8::Value>[data->parameterCount];
 741                     for (int ii = 0; ii < data->parameterCount; ++ii)
 742                         args[ii] = ep->v8engine()->fromVariant(*(QVariant *)a[ii + 1]);
 743                 }
 744
 745                 v8::TryCatch try_catch;
 746
 747                 v8::Local<v8::Value> result = function->Call(ep->v8engine()->global(), data->parameterCount, args);
 748
 749                 QVariant rv;
 750                 if (try_catch.HasCaught()) {
 751                     QDeclarativeError error;
 752                     QDeclarativeExpressionPrivate::exceptionToError(try_catch.Message(), error);
 753                     if (error.isValid())
 754                         ep->warning(error);
 755                     if (a[0]) *(QVariant *)a[0] = QVariant();
 756                 } else {
 757                     if (a[0]) *(QVariant *)a[0] = ep->v8engine()->toVariant(result, 0);
 758                 }
 759
 760                 ep->dereferenceScarceResources(); // "release" scarce resources if top-level expression evaluation is complete.
 761                 return -1;
 762             }
 763             return -1;
 764         }
 765     }
 766
 767     if (parent)
 768         return parent->metaCall(c, _id, a);
 769     else
 770         return object->qt_metacall(c, _id, a);
 771 }
 772
 773 v8::Handle<v8::Function> QDeclarativeVMEMetaObject::method(int index)
 774 {
 775     if (!v8methods)
 776         v8methods = new v8::Persistent<v8::Function>[metaData->methodCount];
 777
 778     if (v8methods[index].IsEmpty()) {
 779         QDeclarativeVMEMetaData::MethodData *data = metaData->methodData() + index;
 780
 781         const QChar *body =
 782             (const QChar *)(((const char*)metaData) + data->bodyOffset);
 783
 784         QString code = QString::fromRawData(body, data->bodyLength);
 785
 786         // XXX We should evaluate all methods in a single big script block to
 787         // improve the call time between dynamic methods defined on the same
 788         // object
 789         v8methods[index] = QDeclarativeExpressionPrivate::evalFunction(ctxt, object, code, ctxt->url.toString(),
 790                                                                        data->lineNumber);
 791     }
 792
 793     return v8methods[index];
 794 }
 795
 796 v8::Handle<v8::Value> QDeclarativeVMEMetaObject::readVarProperty(int id)
 797 {
 798     Q_ASSERT(id >= firstVarPropertyIndex);
 799
 800     ensureVarPropertiesAllocated();
 801     return varProperties->Get(id - firstVarPropertyIndex);
 802 }
 803
 804 QVariant QDeclarativeVMEMetaObject::readPropertyAsVariant(int id)
 805 {
 806     if (id >= firstVarPropertyIndex) {
 807         ensureVarPropertiesAllocated();
 808         return QDeclarativeEnginePrivate::get(ctxt->engine)->v8engine()->toVariant(varProperties->Get(id - firstVarPropertyIndex), -1);
 809     } else {
 810         if (data[id].dataType() == QMetaType::QObjectStar) {
 811             return QVariant::fromValue(data[id].asQObject());
 812         } else {
 813             return data[id].asQVariant();
 814         }
 815     }
 816 }
 817
 818 void QDeclarativeVMEMetaObject::writeVarProperty(int id, v8::Handle<v8::Value> value)
 819 {
 820     Q_ASSERT(id >= firstVarPropertyIndex);
 821     ensureVarPropertiesAllocated();
 822
 823     // Importantly, if the current value is a scarce resource, we need to ensure that it
 824     // gets automatically released by the engine if no other references to it exist.
 825     v8::Local<v8::Value> oldv = varProperties->Get(id - firstVarPropertyIndex);
 826     if (oldv->IsObject()) {
 827         QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(oldv));
 828         if (r) {
 829             r->removeVmePropertyReference();
 830         }
 831     }
 832
 833     // And, if the new value is a scarce resource, we need to ensure that it does not get
 834     // automatically released by the engine until no other references to it exist.
 835     if (value->IsObject()) {
 836         QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(value));
 837         if (r) {
 838             r->addVmePropertyReference();
 839         }
 840     }
 841
 842     // Write the value and emit change signal as appropriate.
 843     varProperties->Set(id - firstVarPropertyIndex, value);
 844     activate(object, methodOffset + id, 0);
 845 }
 846
 847 void QDeclarativeVMEMetaObject::writeProperty(int id, const QVariant &value)
 848 {
 849     if (id >= firstVarPropertyIndex) {
 850         ensureVarPropertiesAllocated();
 851
 852         // Importantly, if the current value is a scarce resource, we need to ensure that it
 853         // gets automatically released by the engine if no other references to it exist.
 854         v8::Local<v8::Value> oldv = varProperties->Get(id - firstVarPropertyIndex);
 855         if (oldv->IsObject()) {
 856             QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(oldv));
 857             if (r) {
 858                 r->removeVmePropertyReference();
 859             }
 860         }
 861
 862         // And, if the new value is a scarce resource, we need to ensure that it does not get
 863         // automatically released by the engine until no other references to it exist.
 864         v8::Handle<v8::Value> newv = QDeclarativeEnginePrivate::get(ctxt->engine)->v8engine()->fromVariant(value);
 865         if (newv->IsObject()) {
 866             QV8VariantResource *r = v8_resource_cast<QV8VariantResource>(v8::Handle<v8::Object>::Cast(newv));
 867             if (r) {
 868                 r->addVmePropertyReference();
 869             }
 870         }
 871
 872         // Write the value and emit change signal as appropriate.
 873         QVariant currentValue = readPropertyAsVariant(id);
 874         varProperties->Set(id - firstVarPropertyIndex, newv);
 875         if ((currentValue.userType() != value.userType() || currentValue != value))
 876             activate(object, methodOffset + id, 0);
 877     } else {
 878         bool needActivate = false;
 879         if (value.userType() == QMetaType::QObjectStar) {
 880             QObject *o = qvariant_cast<QObject *>(value);
 881             needActivate = (data[id].dataType() != QMetaType::QObjectStar || data[id].asQObject() != o);
 882             data[id].setValue(qvariant_cast<QObject *>(value));
 883         } else {
 884             needActivate = (data[id].dataType() != qMetaTypeId<QVariant>() ||
 885                             data[id].asQVariant().userType() != value.userType() ||
 886                             data[id].asQVariant() != value);
 887             data[id].setValue(value);
 888         }
 889
 890         if (needActivate)
 891             activate(object, methodOffset + id, 0);
 892     }
 893 }
 894
 895 void QDeclarativeVMEMetaObject::listChanged(int id)
 896 {
 897     activate(object, methodOffset + id, 0);
 898 }
 899
 900 void QDeclarativeVMEMetaObject::list_append(QDeclarativeListProperty<QObject> *prop, QObject *o)
 901 {
 902     List *list = static_cast<List *>(prop->data);
 903     list->append(o);
 904     QMetaObject::activate(prop->object, list->notifyIndex, 0);
 905 }
 906
 907 int QDeclarativeVMEMetaObject::list_count(QDeclarativeListProperty<QObject> *prop)
 908 {
 909     return static_cast<List *>(prop->data)->count();
 910 }
 911
 912 QObject *QDeclarativeVMEMetaObject::list_at(QDeclarativeListProperty<QObject> *prop, int index)
 913 {
 914     return static_cast<List *>(prop->data)->at(index);
 915 }
 916
 917 void QDeclarativeVMEMetaObject::list_clear(QDeclarativeListProperty<QObject> *prop)
 918 {
 919     List *list = static_cast<List *>(prop->data);
 920     list->clear();
 921     QMetaObject::activate(prop->object, list->notifyIndex, 0);
 922 }
 923
 924 void QDeclarativeVMEMetaObject::registerInterceptor(int index, int valueIndex, QDeclarativePropertyValueInterceptor *interceptor)
 925 {
 926     if (aInterceptors.isEmpty())
 927         aInterceptors.resize(propertyCount() + metaData->propertyCount);
 928     aInterceptors.setBit(index);
 929     interceptors.insert(index, qMakePair(valueIndex, interceptor));
 930 }
 931
 932 int QDeclarativeVMEMetaObject::vmeMethodLineNumber(int index)
 933 {
 934     if (index < methodOffset) {
 935         Q_ASSERT(parent);
 936         return static_cast<QDeclarativeVMEMetaObject *>(parent)->vmeMethodLineNumber(index);
 937     }
 938
 939     int plainSignals = metaData->signalCount + metaData->propertyCount + metaData->aliasCount;
 940     Q_ASSERT(index >= (methodOffset + plainSignals) && index < (methodOffset + plainSignals + metaData->methodCount));
 941
 942     int rawIndex = index - methodOffset - plainSignals;
 943
 944     QDeclarativeVMEMetaData::MethodData *data = metaData->methodData() + rawIndex;
 945     return data->lineNumber;
 946 }
 947
 948 v8::Handle<v8::Function> QDeclarativeVMEMetaObject::vmeMethod(int index)
 949 {
 950     if (index < methodOffset) {
 951         Q_ASSERT(parent);
 952         return static_cast<QDeclarativeVMEMetaObject *>(parent)->vmeMethod(index);
 953     }
 954     int plainSignals = metaData->signalCount + metaData->propertyCount + metaData->aliasCount;
 955     Q_ASSERT(index >= (methodOffset + plainSignals) && index < (methodOffset + plainSignals + metaData->methodCount));
 956     return method(index - methodOffset - plainSignals);
 957 }
 958
 959 // Used by debugger
 960 void QDeclarativeVMEMetaObject::setVmeMethod(int index, v8::Persistent<v8::Function> value)
 961 {
 962     if (index < methodOffset) {
 963         Q_ASSERT(parent);
 964         return static_cast<QDeclarativeVMEMetaObject *>(parent)->setVmeMethod(index, value);
 965     }
 966     int plainSignals = metaData->signalCount + metaData->propertyCount + metaData->aliasCount;
 967     Q_ASSERT(index >= (methodOffset + plainSignals) && index < (methodOffset + plainSignals + metaData->methodCount));
 968
 969     if (!v8methods)
 970         v8methods = new v8::Persistent<v8::Function>[metaData->methodCount];
 971
 972     int methodIndex = index - methodOffset - plainSignals;
 973     if (!v8methods[methodIndex].IsEmpty())
 974         qPersistentDispose(v8methods[methodIndex]);
 975     v8methods[methodIndex] = value;
 976 }
 977
 978 v8::Handle<v8::Value> QDeclarativeVMEMetaObject::vmeProperty(int index)
 979 {
 980     if (index < propOffset) {
 981         Q_ASSERT(parent);
 982         return static_cast<QDeclarativeVMEMetaObject *>(parent)->vmeProperty(index);
 983     }
 984     return readVarProperty(index - propOffset);
 985 }
 986
 987 void QDeclarativeVMEMetaObject::setVMEProperty(int index, v8::Handle<v8::Value> v)
 988 {
 989     if (index < propOffset) {
 990         Q_ASSERT(parent);
 991         static_cast<QDeclarativeVMEMetaObject *>(parent)->setVMEProperty(index, v);
 992         return;
 993     }
 994     return writeVarProperty(index - propOffset, v);
 995 }
 996
 997 void QDeclarativeVMEMetaObject::ensureVarPropertiesAllocated()
 998 {
 999     if (!varPropertiesInitialized)
1000         allocateVarPropertiesArray();
1001 }
1002
1003 // see also: QV8GCCallback::garbageCollectorPrologueCallback()
1004 void QDeclarativeVMEMetaObject::allocateVarPropertiesArray()
1005 {
1006     v8::HandleScope handleScope;
1007     v8::Context::Scope cs(QDeclarativeEnginePrivate::get(ctxt->engine)->v8engine()->context());
1008     varProperties = qPersistentNew(v8::Array::New(metaData->varPropertyCount));
1009     varProperties.MakeWeak(static_cast<void*>(this), VarPropertiesWeakReferenceCallback);
1010     varPropertiesInitialized = true;
1011 }
1012
1013 /*
1014    The "var" properties are stored in a v8::Array which will be strong persistent if the object has cpp-ownership
1015    and the root QObject in the parent chain does not have JS-ownership.  In the weak persistent handle case,
1016    this callback will dispose the handle when the v8object which owns the lifetime of the var properties array
1017    is cleared as a result of all other handles to that v8object being released.
1018    See QV8GCCallback::garbageCollectorPrologueCallback() for more information.
1019  */
1020 void QDeclarativeVMEMetaObject::VarPropertiesWeakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter)
1021 {
1022     QDeclarativeVMEMetaObject *vmemo = static_cast<QDeclarativeVMEMetaObject*>(parameter);
1023     Q_ASSERT(vmemo);
1024     qPersistentDispose(object);
1025     vmemo->varProperties.Clear();
1026 }
1027
1028 void QDeclarativeVMEMetaObject::GcPrologueCallback(QV8GCCallback::Node *node)
1029 {
1030     QDeclarativeVMEMetaObject *vmemo = static_cast<QDeclarativeVMEMetaObject*>(node);
1031     Q_ASSERT(vmemo);
1032     if (!vmemo->varPropertiesInitialized || vmemo->varProperties.IsEmpty() || !vmemo->ctxt || !vmemo->ctxt->engine)
1033         return;
1034     QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(vmemo->ctxt->engine);
1035     ep->v8engine()->addRelationshipForGC(vmemo->object, vmemo->varProperties);
1036 }
1037
1038 bool QDeclarativeVMEMetaObject::aliasTarget(int index, QObject **target, int *coreIndex, int *valueTypeIndex) const
1039 {
1040     Q_ASSERT(index >= propOffset + metaData->propertyCount);
1041
1042     *target = 0;
1043     *coreIndex = -1;
1044     *valueTypeIndex = -1;
1045
1046     if (!ctxt)
1047         return false;
1048
1049     QDeclarativeVMEMetaData::AliasData *d = metaData->aliasData() + (index - propOffset - metaData->propertyCount);
1050     QDeclarativeContext *context = ctxt->asQDeclarativeContext();
1051     QDeclarativeContextPrivate *ctxtPriv = QDeclarativeContextPrivate::get(context);
1052
1053     *target = ctxtPriv->data->idValues[d->contextIdx].data();
1054     if (!*target)
1055         return false;
1056
1057     if (d->isObjectAlias()) {
1058     } else if (d->isValueTypeAlias()) {
1059         *coreIndex = d->propertyIndex();
1060         *valueTypeIndex = d->valueTypeIndex();
1061     } else {
1062         *coreIndex = d->propertyIndex();
1063     }
1064
1065     return true;
1066 }
1067
1068 void QDeclarativeVMEMetaObject::connectAlias(int aliasId)
1069 {
1070     if (!aConnected.testBit(aliasId)) {
1071
1072         if (!aliasEndpoints)
1073             aliasEndpoints = new QDeclarativeVMEMetaObjectEndpoint[metaData->aliasCount];
1074
1075         aConnected.setBit(aliasId);
1076
1077         QDeclarativeVMEMetaData::AliasData *d = metaData->aliasData() + aliasId;
1078
1079         QDeclarativeVMEMetaObjectEndpoint *endpoint = aliasEndpoints + aliasId;
1080         endpoint->metaObject = this;
1081
1082         endpoint->connect(&ctxt->idValues[d->contextIdx].bindings);
1083
1084         endpoint->tryConnect();
1085     }
1086 }
1087
1088 void QDeclarativeVMEMetaObject::connectAliasSignal(int index)
1089 {
1090     int aliasId = (index - methodOffset) - metaData->propertyCount;
1091     if (aliasId < 0 || aliasId >= metaData->aliasCount)
1092         return;
1093
1094     connectAlias(aliasId);
1095 }
1096
1097 QT_END_NAMESPACE