camerauis/cameraapp/generic/inc/CamDriveChangeNotifier.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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/*
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* Copyright (c) 2008 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 CAMDISKCHANGELISTENER_H
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#define CAMDISKCHANGELISTENER_H
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//  INCLUDES
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#include <f32file.h>
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// FORWARD DECLARATIONS
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class MCamDriveChangeNotifierObserver;
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// CLASS DECLARATION
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/**
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*  Mmc Change Notifier.
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*
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*  @since 5.0
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*/
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class MCamDriveChangeNotifierObserver
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    {
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    public:
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        enum TCamDriveChangeType
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            {
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            EDriveDismount,
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            EDriveMount
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            };
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    public: // New functions
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        /**
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        * This method is used to notify changes.
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        */
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        virtual TInt DriveChangeL( TCamDriveChangeType aType ) = 0;
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    protected:
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        /**
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        * Destructor.
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        */
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        virtual ~MCamDriveChangeNotifierObserver() {}
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    };
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/**
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*  Mmc Change Notifier.
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*
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*  @since 5.0
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*/
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class CCamDriveChangeNotifier : public CBase
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    {
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    private:
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        class CCamDiskChangeListener : public CActive
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            {            
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            public:
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                static CCamDiskChangeListener* NewLC( 
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                     RFs& aFs,
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                     TDriveNumber aDrive,
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                     MCamDriveChangeNotifierObserver::TCamDriveChangeType aType,
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                     CCamDriveChangeNotifier& aObserver );
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                ~CCamDiskChangeListener();
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                void Start();
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                void Stop();
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            protected:
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                CCamDiskChangeListener( 
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                     RFs& aFs,
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                     TDriveNumber aDrive,
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                     MCamDriveChangeNotifierObserver::TCamDriveChangeType aType,
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                     CCamDriveChangeNotifier& aObserver );
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            private:
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                /**
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                * From CActive
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                */
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                void DoCancel();
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                /**
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                * From CActive
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                */
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                void RunL();
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            private:
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                RFs& iFs;
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                TDriveNumber iDrive;
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                MCamDriveChangeNotifierObserver::TCamDriveChangeType iType;
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                CCamDriveChangeNotifier& iObserver;
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            };
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    public:  // Constructors and destructor
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        /**
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        * Two-phased constructor.
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        */
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        static CCamDriveChangeNotifier* NewL(
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                                RFs& aFs,
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                                MCamDriveChangeNotifierObserver& aObserver  );
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        /**
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        * Destructor.
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        */
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        ~CCamDriveChangeNotifier();
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    public:
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        /**
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        * Called from listeners
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        */
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        TInt NotifyChangeL( 
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                MCamDriveChangeNotifierObserver::TCamDriveChangeType aType );
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        /**
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        * Called by the observer when pending dismount can be done.
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        */     
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        void SendAllowDismount();        
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        // New functions
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        void StartMonitoring();
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        void CancelMonitoring();
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    private:
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        /**
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        * C++ default constructor.
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        */
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        CCamDriveChangeNotifier( 
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                                RFs& aFs,
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                                MCamDriveChangeNotifierObserver& aObserver );
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    private:    // Data
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        // Ref.
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        MCamDriveChangeNotifierObserver& iObserver;
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        // Ref. File server session
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        RFs& iFs;
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        RPointerArray<CCamDiskChangeListener> iListeners;
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    };
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#endif      // CAMDISKCHANGELISTENER_H
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// End of File