musichomescreen_multiview/mcpmusicplayer/inc/aiplayerpluginengineobserver.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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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:  Music Player stautus observer
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*
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*/
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#ifndef M_AIPLAYERPLUGINENGINEOBSERVER_H
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#define M_AIPLAYERPLUGINENGINEOBSERVER_H
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#include <e32std.h>
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/**
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 *  Player state.
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 */
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enum TMPlayerState
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    {
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    EMPlayerStatePlaying,
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    EMPlayerStatePaused,
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    EMPlayerStateSeeking,
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    EMPlayerStateOther,
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    EMPlayerStateStarting,
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    EMPlayerStateStopped
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    };
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class CFbsBitmap;
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/**
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 *  Observer interface to be implemented by a client of AiPlayerPluginEngine.
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 *
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 *  @lib aiplayerplugin2.lib
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 *  @since S60 5.0
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 */
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class MAiPlayerPluginEngineObserver
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    {
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public:
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    /**
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     * Called when active player instance's state changes
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     *
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     * @since S60 5.0
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     * @param aState Active player state
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     * @see TMPlayerState
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     */
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    virtual void PlayerStateChanged( TMPlayerState aState ) = 0;
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    /**
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     * Called when track info changes (i.e. track changes or current track's
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     * info is updated) in the active player instance.
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     *
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     * @since S60 5.0
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     * @param aTitle Current track's title.
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     * @param aArtist Current track's artist.
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     */
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    virtual void TrackInfoChanged( const TDesC& aTitle, 
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            const TDesC& aArtist ) = 0;
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    /**
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     * Called each second during playback.
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     *
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     * @since S60 5.0
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     * @param aPosition Current playback position in seconds.
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     */
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    virtual void PlaybackPositionChanged( TInt aPosition ) = 0;
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    /**
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     * Called when album art is ready or when there is no album art.
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     *
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     * @since S60 5.0
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     * @param aBitmap the new album art.
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     */
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    virtual void AlbumArtChanged( CFbsBitmap* aBitmap ) = 0;
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    /**
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     * Called When there is an ongoing operation.
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     *
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     * @since S60 5.0
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     */
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    virtual void Opening() = 0;
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    /**
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     * Called when to indicate that the playlist changed and it is empty.
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     *
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     * @since S60 5.0
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     * @param aBitmap the new album art.
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     */
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    virtual void PlaylisIsEmpty() = 0;
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    };
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#endif // ?M_AIPLAYERPLUGINENGINEOBSERVER_H