qqmlvaluetypewrapper_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QQMLVALUETYPEWRAPPER_P_H
#define QQMLVALUETYPEWRAPPER_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <QtCore/qglobal.h>
#include <private/qtqmlglobal_p.h>
 
#include <private/qv4referenceobject_p.h>
 
QT_BEGIN_NAMESPACE
 
class QQmlValueType;
 
namespace QV4 {
 
namespace Heap {
 
#define QQmlValueTypeWrapperMembers(class, Member)
 
DECLARE_HEAP_OBJECT(QQmlValueTypeWrapper, ReferenceObject) {
    DECLARE_MARKOBJECTS(QQmlValueTypeWrapper);
 
    void init(
        const void *data, QMetaType metaType, const QMetaObject *metaObject,
        Object *object, int property, Flags flags)
    {
        ReferenceObject::init(object, property, flags | IsDirty);
        setMetaType(metaType);
        setMetaObject(metaObject);
        if (data)
            setData(data);
    }
 
    QQmlValueTypeWrapper *detached() const;
 
    void destroy();
 
    QMetaType metaType() const
    {
        Q_ASSERT(m_metaType != nullptr);
        return QMetaType(m_metaType);
    }
 
    void setGadgetPtr(void *gadgetPtr) { m_gadgetPtr = gadgetPtr; }
    void *gadgetPtr() const { return m_gadgetPtr; }
 
    const QMetaObject *metaObject() const { return m_metaObject; }
 
    void setData(const void *data)
    {
        const QMetaType type = metaType();
        void *gadget = gadgetPtr();
        if (gadget) {
            type.destruct(gadget);
        } else {
            gadget = ::operator new(type.sizeOf());
            setGadgetPtr(gadget);
        }
        type.construct(gadget, data);
    }
 
    QVariant toVariant() const;
 
    void *storagePointer();
    bool setVariant(const QVariant &variant);
 
    bool readReference();
    bool writeBack(int propertyIndex = QV4::ReferenceObject::AllProperties);
 
private:
    void setMetaObject(const QMetaObject *metaObject) { m_metaObject = metaObject; }
    void setMetaType(QMetaType metaType)
    {
        Q_ASSERT(metaType.isValid());
        m_metaType = metaType.iface();
    }
 
    void *m_gadgetPtr;
    const QtPrivate::QMetaTypeInterface *m_metaType;
    const QMetaObject *m_metaObject;
};
 
}
 
struct Q_QML_EXPORT QQmlValueTypeWrapper : public ReferenceObject
{
    V4_OBJECT2(QQmlValueTypeWrapper, ReferenceObject)
    V4_PROTOTYPE(valueTypeWrapperPrototype)
    Q_MANAGED_TYPE(QMLValueTypeWrapper)
    V4_NEEDS_DESTROY
 
public:
 
    static ReturnedValue create(
            ExecutionEngine *engine, const void *data, const QMetaObject *metaObject,
            QMetaType type, Heap::Object *object, int property, Heap::ReferenceObject::Flags flags);
    static ReturnedValue create(
            ExecutionEngine *engine, Heap::QQmlValueTypeWrapper *cloneFrom, Heap::Object *object);
    static ReturnedValue create(
            ExecutionEngine *engine, const void *, const QMetaObject *metaObject, QMetaType type);
 
    QVariant toVariant() const;
 
    template <typename ValueType>
    ValueType *cast() const
    {
        if (QMetaType::fromType<ValueType>() != d()->metaType())
            return nullptr;
        if (d()->isReference() && !readReferenceValue())
            return nullptr;
        return static_cast<ValueType *>(d()->gadgetPtr());
    }
 
    bool toGadget(void *data) const;
    bool isEqual(const QVariant& value) const;
    int typeId() const;
    QMetaType type() const;
    bool write(QObject *target, int propertyIndex) const;
    bool readReferenceValue() const { return d()->readReference(); }
    const QMetaObject *metaObject() const { return d()->metaObject(); }
 
    QQmlPropertyData dataForPropertyKey(PropertyKey id) const;
 
    static ReturnedValue virtualGet(const Managed *m, PropertyKey id, const Value *receiver, bool *hasProperty);
    static bool virtualPut(Managed *m, PropertyKey id, const Value &value, Value *receiver);
    static bool virtualIsEqualTo(Managed *m, Managed *other);
    static bool virtualHasProperty(const Managed *m, PropertyKey id);
    static PropertyAttributes virtualGetOwnProperty(const Managed *m, PropertyKey id, Property *p);
    static OwnPropertyKeyIterator *virtualOwnPropertyKeys(const Object *m, Value *target);
    static ReturnedValue method_toString(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc);
    static ReturnedValue virtualResolveLookupGetter(const Object *object, ExecutionEngine *engine, Lookup *lookup);
    static bool virtualResolveLookupSetter(Object *object, ExecutionEngine *engine, Lookup *lookup, const Value &value);
 
    static void initProto(ExecutionEngine *v4);
    static int virtualMetacall(Object *object, QMetaObject::Call call, int index, void **a);
 
    static ReturnedValue getGadgetProperty(
            ExecutionEngine *engine, Heap::QQmlValueTypeWrapper *valueTypeWrapper,
            QMetaType metaType, quint16 coreIndex, bool isFunction, bool isEnum);
};
 
}
 
QT_END_NAMESPACE
 
#endif // QQMLVALUETYPEWRAPPER_P_H