/*

* 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:

*

*/

#ifndef CXUISTANDBY_H

#define CXUISTANDBY_H

#include <QObject>

// constants

const int CXUI_STANDBY_CAMERA_TIMEOUT = 60000; // 60 seconds

// forward declaration

class HbDialog;

class QTimer;

class CxeEngine;

class CxuiDocumentLoader;

class CxuiCaptureKeyHandler;

/*

* class CxuiStandby continuously monitors for releasing camera when there are no user actions

* for a specific time period. Timer is used to release the camera HW and switching to stanby mode

* after a delay.Releasing the camera improves power efficiency, but creates additional latency

* when returning to pre-capture view.

*/

class CxuiStandby : public QObject

{

    Q_OBJECT

public:

    CxuiStandby(CxuiCaptureKeyHandler &keyHandler, CxuiDocumentLoader *documentLoader, CxeEngine *engine);

    ~CxuiStandby();

signals:

    /*

    * signal to prepare for standby

    */

    void aboutToEnterStandby();

    /*

    * signal to prepare UI for exiting standby

    */

    void aboutToExitStandby();

public slots:

    void startTimer();

    void stopTimer();

private slots:

    void dismissStandby();

private: // helper methods

    bool proceedToStandy();

    bool eventFilter(QObject *object, QEvent *event);

private:

    CxuiCaptureKeyHandler &mKeyHandler;

    CxuiDocumentLoader *mDocumentLoader; // not own

    CxeEngine *mEngine; // not own

    HbDialog *mStandbyPopup;

    QTimer *mStandbyTimer;

    bool mStandbyDialogVisible;

};

#endif // CXUISTANDBY_H