menucontentsrv/srvinc/menusrvfoldercrnotifier.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 07 Jan 2010 12:55:39 +0200
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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 __MENUSRVFOLDERSCANNER_H__
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#define __MENUSRVFOLDERSCANNER_H__
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#include <e32base.h>
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#include <apgcli.h>
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#include <apgnotif.h>
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#include <cenrepnotifyhandler.h> 
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#include "menuengoperation.h"
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#include "menuengfilter.h"
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#include "mcsfreespaceobserver.h"
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// FORWARD DECLARATION
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class CMenuEng;
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class TMenuItem;
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class CMenuSrvMmcHistory;
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class CRepository;
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class CCenRepNotifyHandler;
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/**
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* Folder scanner.
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* Using AppArc application information, keeps menu application
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* items ("menu:application") up-to-date.
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*
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* Operation is asynchronous (because AppArc startup is asynchronous):
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* 1. ConstructL(): invokes iApaLsSession to build app list (async).
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* 2. RunL(): App list is complete, this object schedules itself to Engine.
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* 3. RunMenuEngOperationL(): The operation is executed by the engine.
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* 4. HandleAppListEvent(): change in app list, go back to step 2.
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*
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* App scanning does the following:
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* - Applications present in the system but not appearing in the menu are added
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*   to the appropriate folder.
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* - Java apps should appear / disappear.
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* - Hide hidden applications, show non-hidden applications (flag "hidden").
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* - Hide / show MMC-related items, according to whether MMC is present or not
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*   (flag "missing"). Keep an MMC history, purge old MMC-based menu items
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*   (== missing menu items whose MMC card has not been seen for long).
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* - Observing AppArc (and MMC, and Java, etc etc) to keep the menu data up
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*   to date continuously.
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*/
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NONSHARABLE_CLASS( CMenuSrvFolderCrNotifier )
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: public CActive, public MMenuEngOperation, public MCenRepNotifyHandlerCallback, 
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MMcsFreeSpaceObserver
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    {
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public:     // Constructor
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    /**
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    * Destructor.
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    */
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    virtual ~CMenuSrvFolderCrNotifier();
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    /**
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    * Two-phased constructor.
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    * @param aEng Engine.
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    */
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    static CMenuSrvFolderCrNotifier* NewL( CMenuEng& aEng );
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private:    // Constructors and destructor
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    /**
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    * Constructor.
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    * @param aEng Engine.
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    */
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    CMenuSrvFolderCrNotifier( CMenuEng& aEng );
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    /**
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    * Second phased constructor.
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    */
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    void ConstructL();
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private:    // from CActive
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    /**
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    * Request completed, schedule engine operation.
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    */
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    void RunL();
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    /**
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    * Cancel request.
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    */
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    void DoCancel();
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    /**
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    * Error handling: ignore error.
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    * @param aErr Error code.
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    */
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    TInt RunError( TInt aError );
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private:    // from MMcsFreeSpaceObserver
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    /**
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     * Handle Free Space Event.
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     */
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    void HandleFreeSpaceEventL();
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private:    // from MMenuEngOperation
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    /**
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    * Execute engine operation:
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    * Do the application scan and update menu accordingly.
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    */
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    void RunMenuEngOperationL();
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    /**
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    * Error handling: ignore error.
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    * @param aErr Error code.
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    */
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    void CompletedMenuEngOperation( TInt aErr );
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    /**
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     * Notifies engine with events
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     * @param aNewHiddenFolder nome of a folder. 
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     */ 
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    void NotifyEngineL( const TDesC& aFolder );
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    /**
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     * Compares arrays and sends notification to engine abaut differences
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     * @param aLeftArray array with folders names. 
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     * @param aRightArray array with folders names.
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     */ 
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    void NotifyEngineL( const RArray<TPtrC>& aLeftArray, 
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    		const RArray<TPtrC>& aRightArray );
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    /**
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     */ 
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    void HandleNewCrHiddenFoldersL( const TDesC& aNewHiddenFolder );
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private:    // from MCenRepNotifyHandlerCallback 
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    /**
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    * Called if one of CR keys has changed
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    * @param aId  Id of the key that has changed.  
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    * @param aNewValue  The new value of the key.  
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    */
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    void HandleNotifyString( TUint32 aKey, const TDesC16& aNewValue );
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private:    // new methods
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    /**
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     */ 
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    void ParseHiddenFoldersL(  const TDesC& aHiddenFolders, 
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                                RArray<TPtrC>& aHiddenFoldersArray );
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private:    // data
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    CMenuEng& iEng ; ///< Engine.
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    RFs iFs; ///< File Server Session. Own.
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    /*
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    * Central repository session
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    */
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	CRepository* iCenRepSession;
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    /*
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    *Central repository change handler for Control Panel Hidden Folders
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    */
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    CCenRepNotifyHandler* iCenRepNotifyHandlerCPHiddenFolders;	
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    TBool iOpStatus;
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    /*
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     * Free Space observer.
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     */
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    CMcsFreeSpaceObserver* iFreeSpaceObserver;
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    /*
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    * Old value from central repository.
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    */
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    RBuf iHiddenCRFolders;
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    /*
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    * New value from central repository.
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    */
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    RBuf iNewHiddenCRFolders;
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    };
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#endif // __MENUSRVFOLDERSCANNER_H__