camerauis/cameraapp/generic/inc/camflashstatus.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 31 Mar 2010 21:06:44 +0300
branchRCL_3
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Revision: 201011 Kit: 201013
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#ifndef CAMFLASHSTATUS_H
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#define CAMFLASHSTATUS_H/*
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* Copyright (c) 2007 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:  Header file for CCamFlashStatus class.
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*
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*  Copyright © 2007 Nokia.  All rights reserved.
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*  This material, including documentation and any related computer
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*  programs, is protected by copyright controlled by Nokia.  All
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*  rights are reserved.  Copying, including reproducing, storing,
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*  adapting or translating, any or all of this material requires the
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*  prior written consent of Nokia.  This material also contains
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*  confidential information which may not be disclosed to others
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*  without the prior written consent of Nokia.
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*
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*
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*/
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// ===========================================================================
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// INCLUDES
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#include <e32base.h>
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#include "mcamcameraobserver.h"
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// ===========================================================================
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// CONSTANTS
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// Flash icon blinking delay (duration of icon on/off state)
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const TInt KFlashIconBlinkDelay = 300*1000; // [microseconds]
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// Enumerated flash charging states. Should probably be 
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// defined in the driver's headers and included from there.
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enum TFlashChargeStatus
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    {
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    EFlashCharged       = 0x1,
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    EFlashRequired      = 0x2,
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    EFlashChargeTimeout = 0x4  
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    };
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/*
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// Flash P&S UID & key
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#ifndef  CAMERAAPP_SIMULATE_XENON_FLASH
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const TInt KFlashPSUid = 0xA0002371;
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#else
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// Use application UID to simulate the flash charging publish
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// and subscribe property. This way, no extra capabilities are needed
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// for creating the property.
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const TInt KFlashPSUid = 0x101FFA86;
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#endif // CAMERAAPP_SIMULATE_XENON_FLASH
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const TInt KFlashPSKey = 0;
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*/
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// ===========================================================================
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// FORWARD DECLARATIONS
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// 
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//class CCamPropertyWatcher;
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class CCamAppController;
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// ===========================================================================
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// CLASS DECLARATION
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/**
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* Interface to notify observer of flash icon visibility.
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* This is used to create icon blinking effect when the flash
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* is being recharged.
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*/
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class MFlashStatusObserver
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    {
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    public:        
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        /*
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        * Flash icon visibility has changed.
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        * @param aVisible new visibility status
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        */  
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        virtual void FlashIconVisible( TBool aVisible ) = 0;      
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        /**
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        * Called every time when camera driver reports error in
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        * flash recharging.                
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        */
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        virtual void FlashError() = 0;        
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    };
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/**
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* Class to handle flash status and flash error status.
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*
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* - Keeps track of the flash recharge and flash error status
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* - Creates events for visibility of the battery icon and uses
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*   this to create blinking effect when the flash is being
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*   charged
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* - Gives an event when a charging error is received from
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*   the camera driver. In this case, the UI can display
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*   an error message.
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*
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*/
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class CCamFlashStatus: public CBase,
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                       public MCamCameraObserver
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                     //public MPropertyObserver
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    {
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    public: // Construction and destruction
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        /**
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        * Two-phased constructor
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        */
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        static CCamFlashStatus* NewL( CCamAppController& aController );
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        /**
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        * Destructor
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        */
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        ~CCamFlashStatus();
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    public: // New functions
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        /**
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        * Subscribes to flash icon blink events. At one time, only one 
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        * observer can be listening for the events. An observer can
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        * unregister itself by giving NULL as aObserver parameter
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        * value.
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        * 
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        * @param aObserver pointer to observer or NULL
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        */
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        void Subscribe( MFlashStatusObserver* aObserver );   
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        /**
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        * Returns true, if flash is fully charged, otherwise false
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        */
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        TBool FlashReady() const;
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        /**
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        * Returns true if there has been an error recharging the flash
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        */
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        TBool FlashError() const;  
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        /**
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        * Set the value returned by FlashError. This may be needed
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        * before application pretended exit.
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        * @param aFlashError
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        */                    
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        void SetFlashError( TBool aFlashError );
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        /**
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        * Returns true, if flash recharge error has already been
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        * reported to user. This eliminates the error displayed
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        * multiple times (for example, when switching between
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        * image and video modes)
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        */
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        TBool ErrorCallbacksEnabled() const;
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        /**
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        * Enable/disable flash error callbacks. Should be set to ETrue
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        * when error message is displayed to user, and to EFalse
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        * during pretended application exit.
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        * @param aErrorReported
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        */        
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        void EnableErrorCallbacks( TBool aCallbacksEnabled );                        
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        /**
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        * Returns true, if flash icon should be displayed, false
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        * otherwise. This cannot be used to determine the charging
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        * status of the flash.
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        */
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        TBool FlashIconVisible() const;
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    //public: // From MPropertyObserver
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        /**
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        * The value of a watched property has changed
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        * @param aCategory The category of the property
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        * @param aKey the Identifier of the property
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        */    
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        //void HandlePropertyChangedL( const TUid& aCategory, const TUint aKey );   
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    public: // From MCamCameraObserver
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        /**
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        * Handle camera event
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        */
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        virtual void HandleCameraEventL( TInt              aStatus, 
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                                         TCamCameraEventId aEventId, 
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                                         TAny*             aEventData = NULL );
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    private: 
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        /** 
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        * C++ default constructor
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        */
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        CCamFlashStatus( CCamAppController& aController );
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        /**
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        * Second phase constructor
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        */
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        void ConstructL();
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        /**
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        * Check if blinking needs to be stopped or started.
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        */
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        void CheckBlinkingStatus();
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        /**
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        * Start flash icon blinking timer
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        */
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        void StartBlinking();
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        /**
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        * Stop flash icon blinking timer, return
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        * the icon to invisible state.
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        */
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        void StopBlinking();
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        /**
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        * Check if flash setting is off.
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        * Flash not ready events are ignored if flash setting is off.
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        */
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        TBool IsFlashOff() const;
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        /**
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        * Notifies observer about error, if necessary
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        */
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        void NotifyObserverAboutFlashError();
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        /**
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        * Updates blink status of the flash icon. 
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        * @param aThis
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        */
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        static TInt BlinkTimerCallback( TAny* aSelf );     
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    private:      
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        // Flash readiness to take a picture        
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        TBool iFlashReady;
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        // Flash is required to take a photo under current
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        // lighting conditions.
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        TBool iFlashRequired;
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        // Flash recharging error status.
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        // If set to true, there has been an error in recharging
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        // the flash, and flash functionality is no more functional.
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        TBool iFlashError;      
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        // Determines whether cllabacks
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        TBool iErrorCallbacksEnabled;
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        // Flash status observer. Typically the container where
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        // the flash icon resides.
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        MFlashStatusObserver* iObserver;
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        // Timer used to create blinking effect of the flash icon
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        CPeriodic* iBlinkTimer;    
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        TBool iBlinking;
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        // Icon visibility 
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        // true - visible, EFalse - not visible
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        TBool iBlinkStatus;        
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        // Used for watching the flash P&S key
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        //CCamPropertyWatcher* iFlashPropertyWatcher;
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        // Register for Camera events through controller.
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        CCamAppController& iController;
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    };
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#endif // CAMFLASHSTATUS_H