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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QDECLARATIVEGUARD_P_H
#define QDECLARATIVEGUARD_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/qdeclarativedata_p.h>
QT_BEGIN_NAMESPACE
class QDeclarativeGuardImpl
{
public:
inline QDeclarativeGuardImpl();
inline QDeclarativeGuardImpl(QObject *);
inline QDeclarativeGuardImpl(const QDeclarativeGuardImpl &);
inline ~QDeclarativeGuardImpl();
QObject *o;
QDeclarativeGuardImpl *next;
QDeclarativeGuardImpl **prev;
inline void addGuard();
inline void remGuard();
};
class QObject;
template<class T>
class QDeclarativeGuard : private QDeclarativeGuardImpl
{
friend class QDeclarativeData;
public:
inline QDeclarativeGuard();
inline QDeclarativeGuard(T *);
inline QDeclarativeGuard(const QDeclarativeGuard<T> &);
inline virtual ~QDeclarativeGuard();
inline QDeclarativeGuard<T> &operator=(const QDeclarativeGuard<T> &o);
inline QDeclarativeGuard<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 *) {}
};
QDeclarativeGuardImpl::QDeclarativeGuardImpl()
: o(0), next(0), prev(0)
{
}
QDeclarativeGuardImpl::QDeclarativeGuardImpl(QObject *g)
: o(g), next(0), prev(0)
{
if (o) addGuard();
}
QDeclarativeGuardImpl::QDeclarativeGuardImpl(const QDeclarativeGuardImpl &g)
: o(g.o), next(0), prev(0)
{
if (o) addGuard();
}
QDeclarativeGuardImpl::~QDeclarativeGuardImpl()
{
if (prev) remGuard();
o = 0;
}
void QDeclarativeGuardImpl::addGuard()
{
Q_ASSERT(!prev);
if (QObjectPrivate::get(o)->wasDeleted)
return;
QDeclarativeData *data = QDeclarativeData::get(o, true);
next = data->guards;
if (next) next->prev = &next;
data->guards = this;
prev = &data->guards;
}
void QDeclarativeGuardImpl::remGuard()
{
Q_ASSERT(prev);
if (next) next->prev = prev;
*prev = next;
next = 0;
prev = 0;
}
template<class T>
QDeclarativeGuard<T>::QDeclarativeGuard()
{
}
template<class T>
QDeclarativeGuard<T>::QDeclarativeGuard(T *g)
: QDeclarativeGuardImpl(g)
{
}
template<class T>
QDeclarativeGuard<T>::QDeclarativeGuard(const QDeclarativeGuard<T> &g)
: QDeclarativeGuardImpl(g)
{
}
template<class T>
QDeclarativeGuard<T>::~QDeclarativeGuard()
{
}
template<class T>
QDeclarativeGuard<T> &QDeclarativeGuard<T>::operator=(const QDeclarativeGuard<T> &g)
{
setObject(g.object());
return *this;
}
template<class T>
QDeclarativeGuard<T> &QDeclarativeGuard<T>::operator=(T *g)
{
setObject(g);
return *this;
}
template<class T>
T *QDeclarativeGuard<T>::object() const
{
return static_cast<T *>(o);
};
template<class T>
void QDeclarativeGuard<T>::setObject(T *g)
{
if (g != o) {
if (prev) remGuard();
o = g;
if (o) addGuard();
}
}
QT_END_NAMESPACE
Q_DECLARE_METATYPE(QDeclarativeGuard<QObject>)
#endif // QDECLARATIVEGUARD_P_H
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