diff options
Diffstat (limited to 'src/qml/qml/qqmlguardedcontextdata_p.h')
-rw-r--r-- | src/qml/qml/qqmlguardedcontextdata_p.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/qml/qml/qqmlguardedcontextdata_p.h b/src/qml/qml/qqmlguardedcontextdata_p.h new file mode 100644 index 0000000000..048f809f48 --- /dev/null +++ b/src/qml/qml/qqmlguardedcontextdata_p.h @@ -0,0 +1,95 @@ +// 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 |