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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 QtQml 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 QQMLABSTRACTEXPRESSION_P_H
#define QQMLABSTRACTEXPRESSION_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 <private/qqmlcontext_p.h>
#include <private/qfieldlist_p.h>
#include <private/qflagpointer_p.h>
QT_BEGIN_NAMESPACE
class Q_QML_PRIVATE_EXPORT QQmlAbstractExpression
{
public:
QQmlAbstractExpression();
virtual ~QQmlAbstractExpression();
bool isValid() const;
QQmlContextData *context() const;
void setContext(QQmlContextData *);
virtual void refresh();
class DeleteWatcher {
public:
inline DeleteWatcher(QQmlAbstractExpression *);
inline ~DeleteWatcher();
inline bool wasDeleted() const;
private:
friend class QQmlAbstractExpression;
QQmlContextData *_c;
QQmlAbstractExpression **_w;
QQmlAbstractExpression *_s;
};
private:
friend class QQmlContext;
friend class QQmlContextData;
friend class QQmlContextPrivate;
QBiPointer<QQmlContextData, DeleteWatcher> m_context;
QQmlAbstractExpression **m_prevExpression;
QQmlAbstractExpression *m_nextExpression;
};
QQmlAbstractExpression::DeleteWatcher::DeleteWatcher(QQmlAbstractExpression *e)
: _c(0), _w(0), _s(e)
{
if (e->m_context.isT1()) {
_w = &_s;
_c = e->m_context.asT1();
e->m_context = this;
} else {
// Another watcher is already registered
_w = &e->m_context.asT2()->_s;
}
}
QQmlAbstractExpression::DeleteWatcher::~DeleteWatcher()
{
Q_ASSERT(*_w == 0 || (*_w == _s && _s->m_context.isT2()));
if (*_w && _s->m_context.asT2() == this)
_s->m_context = _c;
}
bool QQmlAbstractExpression::DeleteWatcher::wasDeleted() const
{
return *_w == 0;
}
QT_END_NAMESPACE
#endif // QQMLABSTRACTEXPRESSION_P_H
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