/****************************************************************************
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the Qt3D module of the Qt Toolkit.
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** 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
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****************************************************************************/

#ifndef QGRAPHICSLOOKATTRANSFORM_H
#define QGRAPHICSLOOKATTRANSFORM_H

#include "qgraphicstransform3d.h"
#include "qdeclarativeitem3d.h"

#include <QtCore/qscopedpointer.h>
#include <QtCore/qpointer.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QGraphicsLookAtTransformPrivate;

class QGraphicsLookAtTransform : public QGraphicsTransform3D
{
    Q_OBJECT
    Q_PROPERTY(bool preserveUpVector READ preserveUpVector WRITE setPreserveUpVector NOTIFY preserveUpVectorChanged)
    Q_PROPERTY(QDeclarativeItem3D* subject READ subject WRITE setSubject NOTIFY subjectChanged )
public:
    QGraphicsLookAtTransform(QObject *parent = 0);
    ~QGraphicsLookAtTransform();

    bool preserveUpVector() const;
    void setPreserveUpVector(bool value);

    QDeclarativeItem3D* subject() const;
    void setSubject(QDeclarativeItem3D* value);

    void applyTo(QMatrix4x4 *matrix) const;
    QGraphicsTransform3D *clone(QObject *parent) const;

private Q_SLOTS:
    void subjectPositionChanged();
    void ancestryChanged();

Q_SIGNALS:
    void preserveUpVectorChanged();
    void subjectChanged();

private:
    QScopedPointer<QGraphicsLookAtTransformPrivate> d_ptr;

    Q_DISABLE_COPY(QGraphicsLookAtTransform)
    Q_DECLARE_PRIVATE(QGraphicsLookAtTransform)
};

QT_END_NAMESPACE

QT_END_HEADER

#endif