diff options
Diffstat (limited to 'src/qml/qml/qqmlguardedcontextdata_p.h')
-rw-r--r-- | src/qml/qml/qqmlguardedcontextdata_p.h | 131 |
1 files changed, 131 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..0b24c04305 --- /dev/null +++ b/src/qml/qml/qqmlguardedcontextdata_p.h @@ -0,0 +1,131 @@ +/**************************************************************************** +** +** Copyright (C) 2020 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 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/qqmlglobal_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; } + + void reset() + { + m_contextData = nullptr; + m_next = nullptr; + m_prev = nullptr; + } + +private: + 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 |