/*
* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
* 
* Description:  Base class for all screensavers.
*
*/

#ifndef SCREENSAVER_H
#define SCREENSAVER_H

#include <QGraphicsWidget>

#include "screensavermodel_global.h"

class ScreensaverPrivate;

enum ScreensaverState
{
    ScreensaverStateConstructed = 0,
    ScreensaverStateInitialized,
    ScreensaverStateBackground,
    ScreensaverStateForeground,
    ScreensaverStatePartialForeground,
    ScreensaverStatePowerSave,
    ScreensaverStateClosed
};

class SREENSAVERMODEL_EXPORT Screensaver : public QObject
{
    Q_OBJECT

public:

    Screensaver(QObject *parent = 0);
    virtual ~Screensaver();

    ScreensaverState currentState();

public slots:

    void initialize();
    void foreground();
    void partialForeground();
    void background();
    void powerSave();
    void close();

protected:

    virtual bool onInitialize();
    virtual bool onForeground() = 0;
    virtual bool onPartialForeground() = 0;
    virtual bool onBackground() = 0;
    virtual bool onPowerSave() = 0;
    virtual bool onClose();

signals:

    void faulted();
    void viewChanged(QGraphicsWidget *widget);

private:

    Q_DISABLE_COPY(Screensaver)

private:

    ScreensaverPrivate * const m_d;
    friend class ScreensaverPrivate;

};

#endif // SCREENSAVER_H