/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** 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.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#ifndef HBVGEFFECT_P_H

#define HBVGEFFECT_P_H

#include <hbglobal.h>

#include <QGraphicsEffect>

#include <QVariant>

class HbVgEffectPrivate;

QT_BEGIN_NAMESPACE

class QGraphicsItem;

QT_END_NAMESPACE

class HB_CORE_PRIVATE_EXPORT HbVgEffect : public QGraphicsEffect

{

    Q_OBJECT

    Q_PROPERTY(qreal opacity READ opacity WRITE setOpacity NOTIFY opacityChanged)

    Q_PROPERTY(bool caching READ caching WRITE setCaching NOTIFY cachingChanged)

public:

    HbVgEffect(QObject *parent = 0);

    ~HbVgEffect();

    void install(QGraphicsItem *item);

    qreal opacity() const;

    virtual void performEffect(QPainter *painter,

                               const QPointF &offset,

                               const QVariant &vgImage,

                               const QSize &vgImageSize) = 0;

    void setChainRoot(HbVgEffect *effect);

    HbVgEffect *chainRoot() const;

    bool caching() const;

    static void releaseCachedResources();

public slots:

    void setOpacity(qreal opacity);

    void setCaching(bool caching);

signals:

    void opacityChanged(qreal opacity);

    void cachingChanged(bool caching);

protected:

    HbVgEffect(HbVgEffectPrivate &dd, QObject *parent = 0);

    void updateEffect();

    void updateEffectBoundingRect();

    QPixmap cached(const QSize &size) const;

    void tryCache(const QPixmap &pm);

    const QGraphicsItem *sourceItemForRoot() const;

    QRectF sourceBoundingRectForRoot() const;

    void draw(QPainter *painter);

    void sourceChanged(ChangeFlags flags);

    HbVgEffectPrivate * const d_ptr;

    Q_DECLARE_PRIVATE_D(d_ptr, HbVgEffect)

    Q_DISABLE_COPY(HbVgEffect)

};

#endif