/****************************************************************************
**
** Copyright (C) 2012 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 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 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, 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.
**
** 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QQMLWATCHER_P_H
#define QQMLWATCHER_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 <QtCore/qobject.h>
#include <QtCore/qlist.h>
#include <QtCore/qpair.h>
#include <QtCore/qhash.h>
#include <QtCore/qset.h>
#include <QtCore/qpointer.h>

QT_BEGIN_NAMESPACE

class QQmlWatchProxy;
class QQmlExpression;
class QQmlContext;
class QMetaProperty;

class QQmlWatcher : public QObject
{
    Q_OBJECT
public:
    QQmlWatcher(QObject * = 0);

    bool addWatch(int id, quint32 objectId);
    bool addWatch(int id, quint32 objectId, const QByteArray &property);
    bool addWatch(int id, quint32 objectId, const QString &expr);

    bool removeWatch(int id);

Q_SIGNALS:
    void propertyChanged(int id, int objectId, const QMetaProperty &property, const QVariant &value);

private:
    friend class QQmlWatchProxy;
    void addPropertyWatch(int id, QObject *object, quint32 objectId, const QMetaProperty &property);

    QHash<int, QList<QPointer<QQmlWatchProxy> > > m_proxies;
};

QT_END_NAMESPACE

#endif // QQMLWATCHER_P_H
