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Diffstat (limited to 'src/qml/qml/qqmlguard_p.h')
| -rw-r--r-- | src/qml/qml/qqmlguard_p.h | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/src/qml/qml/qqmlguard_p.h b/src/qml/qml/qqmlguard_p.h new file mode 100644 index 0000000000..b4e7408fae --- /dev/null +++ b/src/qml/qml/qqmlguard_p.h @@ -0,0 +1,218 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QQMLGUARD_P_H +#define QQMLGUARD_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists for the convenience +// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp. This header +// file may change from version to version without notice, or even be removed. +// +// We mean it. +// + +#include <QtCore/qglobal.h> +#include <QtCore/qvariant.h> +#include <private/qqmldata_p.h> + +QT_BEGIN_NAMESPACE + +class QQmlGuardImpl +{ +public: + inline QQmlGuardImpl(); + inline QQmlGuardImpl(QObject *); + inline QQmlGuardImpl(const QQmlGuardImpl &); + inline ~QQmlGuardImpl(); + + QObject *o; + QQmlGuardImpl *next; + QQmlGuardImpl **prev; + + inline void addGuard(); + inline void remGuard(); +}; + +class QObject; +template<class T> +class QQmlGuard : private QQmlGuardImpl +{ + friend class QQmlData; +public: + inline QQmlGuard(); + inline QQmlGuard(T *); + inline QQmlGuard(const QQmlGuard<T> &); + inline virtual ~QQmlGuard(); + + inline QQmlGuard<T> &operator=(const QQmlGuard<T> &o); + inline QQmlGuard<T> &operator=(T *); + + inline T *object() const; + inline void setObject(T *g); + + inline bool isNull() const + { return !o; } + + inline T* operator->() const + { return static_cast<T*>(const_cast<QObject*>(o)); } + inline T& operator*() const + { return *static_cast<T*>(const_cast<QObject*>(o)); } + inline operator T*() const + { return static_cast<T*>(const_cast<QObject*>(o)); } + inline T* data() const + { return static_cast<T*>(const_cast<QObject*>(o)); } + +protected: + virtual void objectDestroyed(T *) {} +}; + +QT_END_NAMESPACE + +Q_DECLARE_METATYPE(QQmlGuard<QObject>) + +QT_BEGIN_NAMESPACE + +QQmlGuardImpl::QQmlGuardImpl() +: o(0), next(0), prev(0) +{ +} + +QQmlGuardImpl::QQmlGuardImpl(QObject *g) +: o(g), next(0), prev(0) +{ + if (o) addGuard(); +} + +QQmlGuardImpl::QQmlGuardImpl(const QQmlGuardImpl &g) +: o(g.o), next(0), prev(0) +{ + if (o) addGuard(); +} + +QQmlGuardImpl::~QQmlGuardImpl() +{ + if (prev) remGuard(); + o = 0; +} + +void QQmlGuardImpl::addGuard() +{ + Q_ASSERT(!prev); + + if (QObjectPrivate::get(o)->wasDeleted) + return; + + QQmlData *data = QQmlData::get(o, true); + next = data->guards; + if (next) next->prev = &next; + data->guards = this; + prev = &data->guards; +} + +void QQmlGuardImpl::remGuard() +{ + Q_ASSERT(prev); + + if (next) next->prev = prev; + *prev = next; + next = 0; + prev = 0; +} + +template<class T> +QQmlGuard<T>::QQmlGuard() +{ +} + +template<class T> +QQmlGuard<T>::QQmlGuard(T *g) +: QQmlGuardImpl(g) +{ +} + +template<class T> +QQmlGuard<T>::QQmlGuard(const QQmlGuard<T> &g) +: QQmlGuardImpl(g) +{ +} + +template<class T> +QQmlGuard<T>::~QQmlGuard() +{ +} + +template<class T> +QQmlGuard<T> &QQmlGuard<T>::operator=(const QQmlGuard<T> &g) +{ + setObject(g.object()); + return *this; +} + +template<class T> +QQmlGuard<T> &QQmlGuard<T>::operator=(T *g) +{ + setObject(g); + return *this; +} + +template<class T> +T *QQmlGuard<T>::object() const +{ + return static_cast<T *>(o); +}; + +template<class T> +void QQmlGuard<T>::setObject(T *g) +{ + if (g != o) { + if (prev) remGuard(); + o = g; + if (o) addGuard(); + } +} + +QT_END_NAMESPACE + +#endif // QQMLGUARD_P_H |