C++ QDeclarativeAbstractBinding::destroy方法代码示例

QDeclarativeValueTypeProxyBinding::~QDeclarativeValueTypeProxyBinding()
{
    while (m_bindings) {
        QDeclarativeAbstractBinding *binding = m_bindings;
        binding->setEnabled(false, 0);
        binding->destroy();
    }
}

void QDeclarativeValueTypeScriptClass::setProperty(Object *obj, const Identifier &,
                                                   const QScriptValue &value)
{
    QDeclarativeValueTypeObject *o = static_cast<QDeclarativeValueTypeObject *>(obj);

    QVariant v = QDeclarativeEnginePrivate::get(engine)->scriptValueToVariant(value);

    if (o->objectType == QDeclarativeValueTypeObject::Reference) {
        QDeclarativeValueTypeReference *ref = static_cast<QDeclarativeValueTypeReference *>(obj);

        ref->type->read(ref->object, ref->property);
        QMetaProperty p = ref->type->metaObject()->property(m_lastIndex);

        QDeclarativeBinding *newBinding = 0;
        if (value.isFunction() && !value.isRegExp()) {
            QDeclarativeContextData *ctxt = QDeclarativeEnginePrivate::get(engine)->getContext(context());

            QDeclarativePropertyCache::Data cacheData;
            cacheData.flags = QDeclarativePropertyCache::Data::IsWritable;
            cacheData.propType = ref->object->metaObject()->property(ref->property).userType();
            cacheData.coreIndex = ref->property;

            QDeclarativePropertyCache::ValueTypeData valueTypeData;
            valueTypeData.valueTypeCoreIdx = m_lastIndex;
            valueTypeData.valueTypePropType = p.userType();

            newBinding = new QDeclarativeBinding(value, ref->object, ctxt);
            QScriptContextInfo ctxtInfo(context());
            newBinding->setSourceLocation(ctxtInfo.fileName(), ctxtInfo.functionStartLineNumber());
            QDeclarativeProperty prop = QDeclarativePropertyPrivate::restore(cacheData, valueTypeData, ref->object, ctxt);
            newBinding->setTarget(prop);
            if (newBinding->expression().contains(QLatin1String("this")))
                newBinding->setEvaluateFlags(newBinding->evaluateFlags() | QDeclarativeBinding::RequiresThisObject);
        }

        QDeclarativeAbstractBinding *delBinding =
            QDeclarativePropertyPrivate::setBinding(ref->object, ref->property, m_lastIndex, newBinding);
        if (delBinding)
            delBinding->destroy();

        if (p.isEnumType() && (QMetaType::Type)v.type() == QMetaType::Double)
            v = v.toInt();
        p.write(ref->type, v);
        ref->type->write(ref->object, ref->property, 0);

    } else {
        QDeclarativeValueTypeCopy *copy = static_cast<QDeclarativeValueTypeCopy *>(obj);
        copy->type->setValue(copy->value);
        QMetaProperty p = copy->type->metaObject()->property(m_lastIndex);
        p.write(copy->type, v);
        copy->value = copy->type->value();
    }
}

void ObjectNodeInstance::setPropertyBinding(const QString &name, const QString &expression)
{
    QDeclarativeProperty property(object(), name, context());

    if (!property.isValid())
        return;

    if (property.isProperty()) {
        QDeclarativeBinding *binding = new QDeclarativeBinding(expression, object(), context());
        binding->setTarget(property);
        binding->setNotifyOnValueChanged(true);
        QDeclarativeAbstractBinding *oldBinding = QDeclarativePropertyPrivate::setBinding(property, binding);
        if (oldBinding)
            oldBinding->destroy();
        binding->update();
    } else {
        qWarning() << "Cannot set binding for property" << name << ": property is unknown for type"
                   << (modelNode().isValid() ? modelNode().type() : "unknown");
    }
}

void ObjectNodeInstance::doResetProperty(const QString &propertyName)
{
    m_modelAbstractPropertyHash.remove(propertyName);

    QDeclarativeProperty property(object(), propertyName, context());

    if (!property.isValid())
        return;

    QVariant oldValue = property.read();
    if (oldValue.type() == QVariant::Url) {
        QUrl url = oldValue.toUrl();
        QString path = url.toLocalFile();
        if (QFileInfo(path).exists() && nodeInstanceView())
            nodeInstanceView()->removeFilePropertyFromFileSystemWatcher(object(), propertyName, path);
    }


    QDeclarativeAbstractBinding *binding = QDeclarativePropertyPrivate::binding(property);
    if (binding) {
        binding->setEnabled(false, 0);
        binding->destroy();
    }

    if (property.isResettable()) {
        property.reset();
    } else if (property.propertyTypeCategory() == QDeclarativeProperty::List) {
        QDeclarativeListReference list = qvariant_cast<QDeclarativeListReference>(property.read());

        if (!hasFullImplementedListInterface(list)) {
            qWarning() << "Property list interface not fully implemented for Class " << property.property().typeName() << " in property " << property.name() << "!";
            return;
        }

        list.clear();
    } else if (property.isWritable()) {
        if (property.read() == resetValue(propertyName))
            return;
        property.write(resetValue(propertyName));
    }
}

bool QDeclarativePropertyPrivate::writeValueProperty(const QVariant &value, WriteFlags flags)
{
    // Remove any existing bindings on this property
    if (!(flags & DontRemoveBinding)) {
        QDeclarativeAbstractBinding *binding = setBinding(*q, 0);
        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;
}

//.........这里部分代码省略.........

            id -= metaData->propertyCount;

            if (id < metaData->aliasCount) {

                QDeclarativeVMEMetaData::AliasData *d = metaData->aliasData() + id;

                if (d->flags & QML_ALIAS_FLAG_PTR && c == QMetaObject::ReadProperty) 
                        *reinterpret_cast<void **>(a[0]) = 0;

                if (!ctxt) return -1;

                QDeclarativeContext *context = ctxt->asQDeclarativeContext();
                QDeclarativeContextPrivate *ctxtPriv = QDeclarativeContextPrivate::get(context);

                QObject *target = ctxtPriv->data->idValues[d->contextIdx].data();
                if (!target) 
                    return -1;

                connectAlias(id);

                if (d->isObjectAlias()) {
                    *reinterpret_cast<QObject **>(a[0]) = target;
                    return -1;
                } 
                
                // Remove binding (if any) on write
                if(c == QMetaObject::WriteProperty) {
                    int flags = *reinterpret_cast<int*>(a[3]);
                    if (flags & QDeclarativePropertyPrivate::RemoveBindingOnAliasWrite) {
                        QDeclarativeData *targetData = QDeclarativeData::get(target);
                        if (targetData && targetData->hasBindingBit(d->propertyIndex())) {
                            QDeclarativeAbstractBinding *binding = QDeclarativePropertyPrivate::setBinding(target, d->propertyIndex(), d->isValueTypeAlias()?d->valueTypeIndex():-1, 0);
                            if (binding) binding->destroy();
                        }
                    }
                }
                
                if (d->isValueTypeAlias()) {
                    // Value type property
                    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(ctxt->engine);

                    QDeclarativeValueType *valueType = ep->valueTypes[d->valueType()];
                    Q_ASSERT(valueType);

                    valueType->read(target, d->propertyIndex());
                    int rv = QMetaObject::metacall(valueType, c, d->valueTypeIndex(), a);
                    
                    if (c == QMetaObject::WriteProperty)
                        valueType->write(target, d->propertyIndex(), 0x00);

                    return rv;

                } else {
                    return QMetaObject::metacall(target, c, d->propertyIndex(), a);
                }

            }
            return -1;

        }

    } else if(c == QMetaObject::InvokeMetaMethod) {

        if (id >= methodOffset) {

//.........这里部分代码省略.........
            {
                QObject *target = stack.top();
                QDeclarativeParserStatus *status = reinterpret_cast<QDeclarativeParserStatus *>(reinterpret_cast<char *>(target) + instr.begin.castValue);
                parserStatus.append(status);
                status->d = &parserStatus.values[parserStatus.count - 1];

                status->classBegin();
            }
            break;

        case QDeclarativeInstruction::StoreBinding:
        case QDeclarativeInstruction::StoreBindingOnAlias:
            {
                QObject *target = 
                    stack.at(stack.count() - 1 - instr.assignBinding.owner);
                QObject *context = 
                    stack.at(stack.count() - 1 - instr.assignBinding.context);

                QDeclarativeProperty mp = 
                    QDeclarativePropertyPrivate::restore(datas.at(instr.assignBinding.property), target, ctxt);

                int coreIndex = mp.index();

                if ((stack.count() - instr.assignBinding.owner) == 1 && bindingSkipList.testBit(coreIndex)) 
                    break;

                QDeclarativeBinding *bind = new QDeclarativeBinding((void *)datas.at(instr.assignBinding.value).constData(), comp, context, ctxt, comp->name, instr.line, 0);
                bindValues.append(bind);
                bind->m_mePtr = &bindValues.values[bindValues.count - 1];
                bind->setTarget(mp);

                if (instr.type == QDeclarativeInstruction::StoreBindingOnAlias) {
                    QDeclarativeAbstractBinding *old = QDeclarativePropertyPrivate::setBindingNoEnable(target, coreIndex, QDeclarativePropertyPrivate::valueTypeCoreIndex(mp), bind);
                    if (old) { old->destroy(); }
                } else {
                    bind->addToObject(target, QDeclarativePropertyPrivate::bindingIndex(mp));
                }
            }
            break;

        case QDeclarativeInstruction::StoreCompiledBinding:
            {
                QObject *target = 
                    stack.at(stack.count() - 1 - instr.assignBinding.owner);
                QObject *scope = 
                    stack.at(stack.count() - 1 - instr.assignBinding.context);

                int property = instr.assignBinding.property;
                if (stack.count() == 1 && bindingSkipList.testBit(property & 0xFFFF))  
                    break;

                QDeclarativeAbstractBinding *binding = 
                    ctxt->optimizedBindings->configBinding(instr.assignBinding.value, target, scope, property);
                bindValues.append(binding);
                binding->m_mePtr = &bindValues.values[bindValues.count - 1];
                binding->addToObject(target, property);
            }
            break;

        case QDeclarativeInstruction::StoreValueSource:
            {
                QObject *obj = stack.pop();
                QDeclarativePropertyValueSource *vs = reinterpret_cast<QDeclarativePropertyValueSource *>(reinterpret_cast<char *>(obj) + instr.assignValueSource.castValue);
                QObject *target = stack.at(stack.count() - 1 - instr.assignValueSource.owner);

                QDeclarativeProperty prop = 

static void removeBindingOnProperty(QObject *o, int index)
{
    QDeclarativeAbstractBinding *binding = QDeclarativePropertyPrivate::setBinding(o, index, -1, 0);
    if (binding) binding->destroy();
}

void QDeclarativeObjectScriptClass::setProperty(QObject *obj,
                                                const Identifier &name,
                                                const QScriptValue &value,
                                                QScriptContext *context,
                                                QDeclarativeContextData *evalContext)
{
    Q_UNUSED(name);

    Q_ASSERT(obj);
    Q_ASSERT(lastData);
    Q_ASSERT(context);

    if (!lastData->isValid()) {
        QString error = QLatin1String("Cannot assign to non-existent property \"") +
                        toString(name) + QLatin1Char('\"');
        context->throwError(error);
        return;
    }

    if (!(lastData->flags & QDeclarativePropertyCache::Data::IsWritable) && 
        !(lastData->flags & QDeclarativePropertyCache::Data::IsQList)) {
        QString error = QLatin1String("Cannot assign to read-only property \"") +
                        toString(name) + QLatin1Char('\"');
        context->throwError(error);
        return;
    }

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

    if (!evalContext) {
        // Global object, QScriptContext activation object, QDeclarativeContext object
        QScriptValue scopeNode = scopeChainValue(context, -3);
        if (scopeNode.isValid()) {
            Q_ASSERT(scriptClass(scopeNode) == enginePriv->contextClass);

            evalContext = enginePriv->contextClass->contextFromValue(scopeNode);
        }
    }

    QDeclarativeAbstractBinding *delBinding =
        QDeclarativePropertyPrivate::setBinding(obj, lastData->coreIndex, -1, 0);
    if (delBinding)
        delBinding->destroy();

    if (value.isNull() && lastData->flags & QDeclarativePropertyCache::Data::IsQObjectDerived) {
        QObject *o = 0;
        int status = -1;
        int flags = 0;
        void *argv[] = { &o, 0, &status, &flags };
        QMetaObject::metacall(obj, QMetaObject::WriteProperty, lastData->coreIndex, argv);
    } else if (value.isUndefined() && lastData->flags & QDeclarativePropertyCache::Data::IsResettable) {
        void *a[] = { 0 };
        QMetaObject::metacall(obj, QMetaObject::ResetProperty, lastData->coreIndex, a);
    } else if (value.isUndefined() && lastData->propType == qMetaTypeId<QVariant>()) {
        QDeclarativePropertyPrivate::write(obj, *lastData, QVariant(), evalContext);
    } else if (value.isUndefined()) {
        QString error = QLatin1String("Cannot assign [undefined] to ") +
                        QLatin1String(QMetaType::typeName(lastData->propType));
        context->throwError(error);
    } else {
        QVariant v;
        if (lastData->flags & QDeclarativePropertyCache::Data::IsQList)
            v = enginePriv->scriptValueToVariant(value, qMetaTypeId<QList<QObject *> >());
        else
            v = enginePriv->scriptValueToVariant(value, lastData->propType);

        if (!QDeclarativePropertyPrivate::write(obj, *lastData, v, evalContext)) {
            const char *valueType = 0;
            if (v.userType() == QVariant::Invalid) valueType = "null";
            else valueType = QMetaType::typeName(v.userType());

            QString error = QLatin1String("Cannot assign ") +
                            QLatin1String(valueType) +
                            QLatin1String(" to ") +
                            QLatin1String(QMetaType::typeName(lastData->propType));
            context->throwError(error);
        }
    }
}

void QDeclarativeObjectScriptClass::setProperty(QObject *obj,
                                                const Identifier &name,
                                                const QScriptValue &value,
                                                QScriptContext *context,
                                                QDeclarativeContextData *evalContext)
{
    Q_UNUSED(name);

    Q_ASSERT(obj);
    Q_ASSERT(lastData);
    Q_ASSERT(context);

    if (!lastData->isValid()) {
        QString error = QLatin1String("Cannot assign to non-existent property \"") +
                        toString(name) + QLatin1Char('\"');
        context->throwError(error);
        return;
    }

    if (!(lastData->flags & QDeclarativePropertyCache::Data::IsWritable) && 
        !(lastData->flags & QDeclarativePropertyCache::Data::IsQList)) {
        QString error = QLatin1String("Cannot assign to read-only property \"") +
                        toString(name) + QLatin1Char('\"');
        context->throwError(error);
        return;
    }

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

    if (!evalContext) {
        // Global object, QScriptContext activation object, QDeclarativeContext object
        QScriptValue scopeNode = scopeChainValue(context, -3);
        if (scopeNode.isValid()) {
            Q_ASSERT(scriptClass(scopeNode) == enginePriv->contextClass);

            evalContext = enginePriv->contextClass->contextFromValue(scopeNode);
        }
    }

    QDeclarativeBinding *newBinding = 0;
    if (value.isFunction() && !value.isRegExp()) {
        QScriptContextInfo ctxtInfo(context);
        QDeclarativePropertyCache::ValueTypeData valueTypeData;

        newBinding = new QDeclarativeBinding(value, obj, evalContext);
        newBinding->setSourceLocation(ctxtInfo.fileName(), ctxtInfo.functionStartLineNumber());
        newBinding->setTarget(QDeclarativePropertyPrivate::restore(*lastData, valueTypeData, obj, evalContext));
        if (newBinding->expression().contains(QLatin1String("this")))
            newBinding->setEvaluateFlags(newBinding->evaluateFlags() | QDeclarativeBinding::RequiresThisObject);
    }

    QDeclarativeAbstractBinding *delBinding =
        QDeclarativePropertyPrivate::setBinding(obj, lastData->coreIndex, -1, newBinding);
    if (delBinding)
        delBinding->destroy();

    if (value.isNull() && lastData->flags & QDeclarativePropertyCache::Data::IsQObjectDerived) {
        QObject *o = 0;
        int status = -1;
        int flags = 0;
        void *argv[] = { &o, 0, &status, &flags };
        QMetaObject::metacall(obj, QMetaObject::WriteProperty, lastData->coreIndex, argv);
    } else if (value.isUndefined() && lastData->flags & QDeclarativePropertyCache::Data::IsResettable) {
        void *a[] = { 0 };
        QMetaObject::metacall(obj, QMetaObject::ResetProperty, lastData->coreIndex, a);
    } else if (value.isUndefined() && lastData->propType == qMetaTypeId<QVariant>()) {
        QDeclarativePropertyPrivate::write(obj, *lastData, QVariant(), evalContext);
    } else if (value.isUndefined()) {
        QString error = QLatin1String("Cannot assign [undefined] to ") +
                        QLatin1String(QMetaType::typeName(lastData->propType));
        context->throwError(error);
    } else if (value.isFunction() && !value.isRegExp()) {
        // this is handled by the binding creation above
    } else {
        //### expand optimization for other known types
        if (lastData->propType == QMetaType::Int && value.isNumber()) {
            int rawValue = qRoundDouble(value.toNumber());
            int status = -1;
            int flags = 0;
            void *a[] = { (void *)&rawValue, 0, &status, &flags };
            QMetaObject::metacall(obj, QMetaObject::WriteProperty,
                                  lastData->coreIndex, a);
            return;
        } else if (lastData->propType == QMetaType::QReal && value.isNumber()) {
            qreal rawValue = qreal(value.toNumber());
            int status = -1;
            int flags = 0;
            void *a[] = { (void *)&rawValue, 0, &status, &flags };
            QMetaObject::metacall(obj, QMetaObject::WriteProperty,
                                  lastData->coreIndex, a);
            return;
        } else if (lastData->propType == QMetaType::QString && value.isString()) {
            const QString &rawValue = value.toString();
            int status = -1;
            int flags = 0;
            void *a[] = { (void *)&rawValue, 0, &status, &flags };
            QMetaObject::metacall(obj, QMetaObject::WriteProperty,
                                  lastData->coreIndex, a);
            return;
        }
//.........这里部分代码省略.........