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/****************************************************************************
**
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QQMLTCOBJECTCREATIONHELPER_P_H
#define QQMLTCOBJECTCREATIONHELPER_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 <QtQml/qqml.h>
#include <QtCore/private/qglobal_p.h>
#include <QtCore/qversionnumber.h>
#include <private/qtqmlglobal_p.h>
#include <private/qqmltype_p.h>
#include <array>
QT_BEGIN_NAMESPACE
/*!
\internal
(Kind of) type-erased object creation utility that can be used throughout
the generated C++ code. By nature it shows relative data to the current QML
document and allows to get and set object pointers.
*/
class QQmltcObjectCreationHelper
{
QObject **m_data = nullptr; // QObject* array
const qsizetype m_size = 0; // size of m_data array, exists for bounds checking
const qsizetype m_offset = 0; // global offset into m_data array
qsizetype offset() const { return m_offset; }
public:
/*!
Constructs initial "view" from basic data. Supposed to only be called
once from QQmltcObjectCreationBase.
*/
QQmltcObjectCreationHelper(QObject **data, qsizetype size) : m_data(data), m_size(size)
{
Q_UNUSED(m_size);
}
/*!
Constructs new "view" from \a base view, adding \a localOffset to the
offset of that base.
*/
QQmltcObjectCreationHelper(const QQmltcObjectCreationHelper *base, qsizetype localOffset)
: m_data(base->m_data), m_size(base->m_size), m_offset(base->m_offset + localOffset)
{
}
template<typename T>
T *get(qsizetype i) const
{
Q_ASSERT(m_data);
Q_ASSERT(i >= 0 && i + offset() < m_size);
Q_ASSERT(qobject_cast<T *>(m_data[i + offset()]) != nullptr);
// Note: perform cheap cast as we know *exactly* the real type of the
// object
return static_cast<T *>(m_data[i + offset()]);
}
void set(qsizetype i, QObject *object)
{
Q_ASSERT(m_data);
Q_ASSERT(i >= 0 && i + offset() < m_size);
Q_ASSERT(m_data[i + offset()] == nullptr); // prevent accidental resets
m_data[i + offset()] = object;
}
template<typename T>
static constexpr uint typeCount() noexcept
{
return T::q_qmltc_typeCount();
}
};
/*!
\internal
Base helper for qmltc-generated types that linearly stores pointers to all
the to-be-created objects for fast access during object creation.
*/
template<typename QmltcGeneratedType>
class QQmltcObjectCreationBase
{
// Note: +1 for the document root itself
std::array<QObject *, QmltcGeneratedType::q_qmltc_typeCount() + 1> m_objects = {};
public:
QQmltcObjectCreationHelper view()
{
return QQmltcObjectCreationHelper(m_objects.data(), m_objects.size());
}
};
struct QmltcTypeData
{
QQmlType::RegistrationType regType = QQmlType::CppType;
int allocationSize = 0;
const QMetaObject *metaObject = nullptr;
template<typename QmltcGeneratedType>
QmltcTypeData(QmltcGeneratedType *)
: allocationSize(sizeof(QmltcGeneratedType)),
metaObject(&QmltcGeneratedType::staticMetaObject)
{
}
};
Q_QML_PRIVATE_EXPORT void qmltcCreateDynamicMetaObject(QObject *object,
const QMetaObject *staticMetaObject,
const QmltcTypeData &data);
QT_END_NAMESPACE
#endif // QQMLTCOBJECTCREATIONHELPER_P_H
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