skins/AknSkins/srvinc/aknssrvwallpapertimer.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:14:12 +0200
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/*
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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:  Slide set wallpaper timer.
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*
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*/
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#ifndef C_AKNSWALLPAPERTIMER_H
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#define C_AKNSWALLPAPERTIMER_H
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#include <e32base.h>
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/**
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 *  Observer interface for wallpaper slide set timer.
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 *
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 *  This interface is called when timer fires according
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 *  to interval period defined when creating an instance.
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 *
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 *  @lib aknssrv.lib
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 *  @since S60 v3.2
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 */
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class MAknsSrvWallpaperListener
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    {
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    public:
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        virtual void WallpaperTimerTimeoutL( TBool aForceChange = EFalse ) = 0;
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    };
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/**
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 *  Slideset wallpaper timer.
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 *
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 *  This class defines a timer for changing the image
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 *  in a slide set. When timer fires according to interval
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 *  given when creating the class, observer interface
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 *  MAknsSrvWallpaperListener::WallpaperTimerTimeoutL is
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 *  called.
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 *
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 *  @lib aknssrv.lib
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 *  @since S60 v3.2
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 */
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NONSHARABLE_CLASS(CAknsSrvWallpaperTimer) : public CActive
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    {
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    public:
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        /**
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        * Creates a new instance of wallpaper slide set timer.
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        * @param aListener observer for this timer's events.
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        *
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        * @return new instance of wallpaper slide set timer.
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        */
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        static CAknsSrvWallpaperTimer* NewL(
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            MAknsSrvWallpaperListener* aListener );
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        /**
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        * Start the timer.
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        * @param aInterval firing interval in seconds.
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        *        The timer is fired after each interval period,
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        *        until stopped.
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        */
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        void Start( TInt aInterval );
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        /**
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        * Stop the timer.
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        */
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        void Stop();
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        /**
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        * Returns the interval period of the timer.
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        * @return interval period of the timer.
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        */
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        TInt Interval();
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        /**
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        * Destructor. Cancels and closes the timer.
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        */
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        ~CAknsSrvWallpaperTimer();
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    protected:
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        /**
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        * Handles an active object's request completion event.
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        * @from CActive.
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        */
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        void RunL();
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        /**
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        * Implements cancellation of an outstanding request.
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        * @from CActive.
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        */
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        void DoCancel();
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    private:
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        // Second phase constructor.
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        void ConstructL();
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        // C++ constructor.
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        CAknsSrvWallpaperTimer( MAknsSrvWallpaperListener* aListener );
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        /**
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        * Issues a new request. If active object is already running,
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        * nothing happens.
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        * @param aTempInterval a new interval to use.
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        */
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        void IssueRequest( TInt aTempInterval = 0 );
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    private:
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        /**
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        * Pointer to timer firing event listener.
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        * Not own.
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        */
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        MAknsSrvWallpaperListener* iListener;
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        /**
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        * Interval when timer should fire.
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        */
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        TInt iInterval;
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        /**
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        * Has the request been cancelled.
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        */
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        TBool iCanceled;
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        /**
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        * Timer object.
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        */
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        RTimer iTimer;
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        /**
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        * Previous time when timer was fired.
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        */
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        TTime iPreviousTime;
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    };
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#endif // C_AKNSWALLPAPERTIMER_H