camerauis/cameraxui/cxui/inc/cxuistandby.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 16 Apr 2010 14:51:30 +0300
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#ifndef CXUISTANDBY_H
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#define CXUISTANDBY_H
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#include <QObject>
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// constants
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const int CXUI_STANDBY_CAMERA_TIMEOUT = 60000; // 60 seconds
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// forward declaration
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class HbDialog;
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class QTimer;
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class CxeEngine;
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class CxuiDocumentLoader;
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class CxuiCaptureKeyHandler;
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/*
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* class CxuiStandby continuously monitors for releasing camera when there are no user actions
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* for a specific time period. Timer is used to release the camera HW and switching to stanby mode
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* after a delay.Releasing the camera improves power efficiency, but creates additional latency
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* when returning to pre-capture view.
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*/
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class CxuiStandby : public QObject
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{
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    Q_OBJECT
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public:
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    CxuiStandby(CxuiCaptureKeyHandler &keyHandler, CxuiDocumentLoader *documentLoader, CxeEngine *engine);
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    ~CxuiStandby();
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signals:
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    /*
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    * signal to prepare for standby
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    */
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    void aboutToEnterStandby();
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    /*
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    * signal to prepare UI for exiting standby
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    */
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    void aboutToExitStandby();
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public slots:
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    /*
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    * starts standby timer
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    */
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    void startTimer();
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    /*
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    * stops standby timer
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    */
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    void stopTimer();
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    /*
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    * handles focus gain event
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    */
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    bool handleMouseEvent();
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private slots:
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    void dismissStandby();
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    void toStandby();
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private: // helper methods
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    bool proceedToStandy();
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    bool eventFilter(QObject *object, QEvent *event);
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private:
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    CxuiCaptureKeyHandler &mKeyHandler;
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    CxuiDocumentLoader *mDocumentLoader; // not own
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    CxeEngine *mEngine; // not own
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    HbDialog *mStandbyPopup;
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    QTimer *mStandbyTimer;
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    bool mStandbyDialogVisible;
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};
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#endif // CXUISTANDBY_H