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// Copyright (C) 2019 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 QQMLMETAOBJECT_P_H
#define QQMLMETAOBJECT_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 <private/qqmlpropertycache_p.h>
#include <QtQml/qtqmlglobal.h>
#include <QtCore/qvarlengtharray.h>
#include <QtCore/qmetaobject.h>
QT_BEGIN_NAMESPACE
// QQmlMetaObject serves as a wrapper around either QMetaObject or QQmlPropertyCache.
// This is necessary as we delay creation of QMetaObject for synthesized QObjects, but
// we don't want to needlessly generate QQmlPropertyCaches every time we encounter a
// QObject type used in assignment or when we don't have a QQmlEngine etc.
//
// This class does NOT reference the propertycache.
class QQmlEnginePrivate;
class QQmlPropertyData;
class Q_QML_EXPORT QQmlMetaObject
{
public:
template<qsizetype Prealloc>
using ArgTypeStorage = QVarLengthArray<QMetaType, Prealloc>;
inline QQmlMetaObject() = default;
inline QQmlMetaObject(const QObject *);
inline QQmlMetaObject(const QMetaObject *);
inline QQmlMetaObject(const QQmlPropertyCache::ConstPtr &);
inline QQmlMetaObject(const QQmlMetaObject &);
inline QQmlMetaObject &operator=(const QQmlMetaObject &);
inline bool isNull() const;
inline const char *className() const;
inline int propertyCount() const;
inline const QMetaObject *metaObject() const;
QMetaType methodReturnType(const QQmlPropertyData &data, QByteArray *unknownTypeError) const;
/*!
\internal
Returns false if one of the types is unknown. Otherwise, fills \a argstorage with the
metatypes of the function.
*/
template<typename ArgTypeStorage>
bool methodParameterTypes(
int index, ArgTypeStorage *argStorage, QByteArray *unknownTypeError) const
{
Q_ASSERT(_m && index >= 0);
QMetaMethod m = _m->method(index);
return methodParameterTypes(m, argStorage, unknownTypeError);
}
/*!
\internal
Returns false if one of the types is unknown. Otherwise, fills \a argstorage with the
metatypes of the function.
*/
template<typename ArgTypeStorage>
bool constructorParameterTypes(
int index, ArgTypeStorage *dummy, QByteArray *unknownTypeError) const
{
QMetaMethod m = _m->constructor(index);
return methodParameterTypes(m, dummy, unknownTypeError);
}
static bool canConvert(const QQmlMetaObject &from, const QQmlMetaObject &to)
{
Q_ASSERT(!from.isNull() && !to.isNull());
return from.metaObject()->inherits(to.metaObject());
}
// static_metacall (on Gadgets) doesn't call the base implementation and therefore
// we need a helper to find the correct meta object and property/method index.
static void resolveGadgetMethodOrPropertyIndex(
QMetaObject::Call type, const QMetaObject **metaObject, int *index);
template<typename ArgTypeStorage>
static bool methodParameterTypes(
const QMetaMethod &method, ArgTypeStorage *argStorage, QByteArray *unknownTypeError)
{
Q_ASSERT(argStorage);
const int argc = method.parameterCount();
argStorage->resize(argc);
for (int ii = 0; ii < argc; ++ii) {
if (!parameterType(method, ii, unknownTypeError, [argStorage](int ii, QMetaType &&type) {
argStorage->operator[](ii) = std::forward<QMetaType>(type);
})) {
return false;
}
}
return true;
}
template<typename ArgTypeStorage>
static bool methodReturnAndParameterTypes(
const QMetaMethod &method, ArgTypeStorage *argStorage, QByteArray *unknownTypeError)
{
Q_ASSERT(argStorage);
const int argc = method.parameterCount();
argStorage->resize(argc + 1);
QMetaType type = method.returnMetaType();
if (type.flags().testFlag(QMetaType::IsEnumeration))
type = type.underlyingType();
if (!type.isValid()) {
if (unknownTypeError)
*unknownTypeError = "return type";
return false;
}
argStorage->operator[](0) = type;
for (int ii = 0; ii < argc; ++ii) {
if (!parameterType(
method, ii, unknownTypeError, [argStorage](int ii, QMetaType &&type) {
argStorage->operator[](ii + 1) = std::forward<QMetaType>(type);
})) {
return false;
}
}
return true;
}
protected:
template<typename Store>
static bool parameterType(
const QMetaMethod &method, int ii, QByteArray *unknownTypeError, const Store &store)
{
QMetaType type = method.parameterMetaType(ii);
// we treat enumerations as their underlying type
if (type.flags().testFlag(QMetaType::IsEnumeration))
type = type.underlyingType();
if (!type.isValid()) {
if (unknownTypeError)
*unknownTypeError = method.parameterTypeName(ii);
return false;
}
store(ii, std::move(type));
return true;
}
const QMetaObject *_m = nullptr;
};
QQmlMetaObject::QQmlMetaObject(const QObject *o)
{
if (o)
_m = o->metaObject();
}
QQmlMetaObject::QQmlMetaObject(const QMetaObject *m)
: _m(m)
{
}
QQmlMetaObject::QQmlMetaObject(const QQmlPropertyCache::ConstPtr &m)
{
if (m)
_m = m->createMetaObject();
}
QQmlMetaObject::QQmlMetaObject(const QQmlMetaObject &o)
: _m(o._m)
{
}
QQmlMetaObject &QQmlMetaObject::operator=(const QQmlMetaObject &o)
{
_m = o._m;
return *this;
}
bool QQmlMetaObject::isNull() const
{
return !_m;
}
const char *QQmlMetaObject::className() const
{
if (!_m)
return nullptr;
return metaObject()->className();
}
int QQmlMetaObject::propertyCount() const
{
if (!_m)
return 0;
return metaObject()->propertyCount();
}
const QMetaObject *QQmlMetaObject::metaObject() const
{
return _m;
}
QT_END_NAMESPACE
#endif // QQMLMETAOBJECT_P_H
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