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// Copyright (C) 2020 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 QQMLGUARDEDCONTEXTDATA_P_H
#define QQMLGUARDEDCONTEXTDATA_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/private/qtqmlglobal_p.h>
#include <QtQml/private/qqmlcontextdata_p.h>
QT_BEGIN_NAMESPACE
class QQmlGuardedContextData
{
Q_DISABLE_COPY(QQmlGuardedContextData);
public:
QQmlGuardedContextData() = default;
~QQmlGuardedContextData() { unlink(); }
QQmlGuardedContextData(QQmlGuardedContextData &&) = default;
QQmlGuardedContextData &operator=(QQmlGuardedContextData &&) = default;
QQmlGuardedContextData(QQmlRefPointer<QQmlContextData> data)
{
setContextData(std::move(data));
}
QQmlGuardedContextData &operator=(QQmlRefPointer<QQmlContextData> d)
{
setContextData(std::move(d));
return *this;
}
QQmlRefPointer<QQmlContextData> contextData() const { return m_contextData; }
void setContextData(QQmlRefPointer<QQmlContextData> contextData)
{
if (m_contextData.data() == contextData.data())
return;
unlink();
if (contextData) {
m_contextData = std::move(contextData);
m_next = m_contextData->m_contextGuards;
if (m_next)
m_next->m_prev = &m_next;
m_contextData->m_contextGuards = this;
m_prev = &m_contextData->m_contextGuards;
}
}
bool isNull() const { return !m_contextData; }
operator const QQmlRefPointer<QQmlContextData> &() const { return m_contextData; }
QQmlContextData &operator*() const { return m_contextData.operator*(); }
QQmlContextData *operator->() const { return m_contextData.operator->(); }
QQmlGuardedContextData *next() const { return m_next; }
private:
void reset()
{
m_contextData.reset();
m_next = nullptr;
m_prev = nullptr;
}
void unlink()
{
if (m_prev) {
*m_prev = m_next;
if (m_next)
m_next->m_prev = m_prev;
reset();
}
}
QQmlRefPointer<QQmlContextData> m_contextData;
QQmlGuardedContextData *m_next = nullptr;
QQmlGuardedContextData **m_prev = nullptr;
};
QT_END_NAMESPACE
#endif // QQMLGUARDEDCONTEXTDATA_P_H
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