/*

* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:   Thumbnail Composer  plugin

*

*/

/**

 * @internal reviewed 12/07/2007 by Simon Brooks

 */

#ifndef __CTHUMBNAILCOMPOSERPLUGIN_H__

#define __CTHUMBNAILCOMPOSERPLUGIN_H__

#include <composerplugin.h>

#include <mdeobject.h>

#include <mpxcollectionobserver.h>

class MMPXCollectionUtility;

class CMPXCollectionPath;

class CGlxThumbnailComposerPlugin;

/**

 * Timer to allow inactivity delay if background generation task is cancelled

 */

class CGlxThumbnailCompeserInactivityTimer : public CTimer

    {

    public:

        ~CGlxThumbnailCompeserInactivityTimer();

        static CGlxThumbnailCompeserInactivityTimer* NewL(TInt aPriority, CGlxThumbnailComposerPlugin& aCallback);

        void After(TTimeIntervalMicroSeconds32 aInterval);

    private:

        CGlxThumbnailCompeserInactivityTimer(TInt aPriority, CGlxThumbnailComposerPlugin& aCallback);

    private: // from CActive

        void RunL();

        void DoCancel();

        TInt RunError(TInt aError);

    private:

        CGlxThumbnailComposerPlugin& iCallback;

    };

/**

 * Composer plugin to initiate background generation when new items are

 * harvested by the MDS harvester.

 *

 * @author David Holland

 */

NONSHARABLE_CLASS( CGlxThumbnailComposerPlugin ) :

                  public CComposerPlugin, MMPXCollectionObserver 

    {

    public:

        /**

        * Construction

        */

        static CGlxThumbnailComposerPlugin* NewL();

        /**

        * Destruction

        */

        ~CGlxThumbnailComposerPlugin();

    private:    // From CComposerPlugin

        TBool IsComposingComplete();

        void SetObservers();

        void RemoveObservers();

    private:    // From MMdEObjectObserver

#ifdef GLX_USE_MDS_2_0

        void HandleObjectAdded(CMdESession& aSession,

                                const RArray<TItemId>& aObjectIdArray);

        void HandleObjectModified(CMdESession& aSession,

                                const RArray<TItemId>& aObjectIdArray);

        void HandleObjectRemoved(CMdESession& aSession,

                                const RArray<TItemId>& aObjectIdArray);

#else

        /**

         * See @ref MMdEObjectObserver::HandleObjectNotification

         */

        void HandleObjectNotification(CMdESession& aSession, 

		    				TObserverNotificationType aType,

				    		const RArray<TItemId>& aObjectIdArray);

#endif

    private:    // From MMPXCollectionObserver

        void HandleCollectionMediaL( const CMPXMedia& aMedia, TInt aError );

        void HandleCollectionMessage( CMPXMessage* aMsg, TInt aErr );

        void HandleOpenL( const CMPXMedia& aEntries,

                            TInt aIndex, TBool aComplete, TInt aError );

        void HandleOpenL( const CMPXCollectionPlaylist& aPlaylist,

                            TInt aError );

        void HandleCommandComplete( CMPXCommand* aCommandResult,

                                    TInt aError );

    private:

        /**

        * Private constructor

        */	

        CGlxThumbnailComposerPlugin();

        /**

        * 2nd phase construction

        */	

        void ConstructL();

        /**

        * Add observers to MdE session.

        */

        void SetObserversL();

        void DoHandleCollectionMessageL( const CMPXMessage& aMsg );

        /**

        * Send next media request to the collection.

        */

        void RequestItemL();

    public:

        /**

        * Open "all" collection with thumbnail loadability filter.

        */

        void DoOpenCollectionL();

        /**

        * Send next media request to the collection.

        */

        void DoRequestItemL();

        /**

        * Free resources and go to idle state.

        */

        void ReturnToIdle();

        /**

        * Callback for iCollectionCloser

        */

        void CloseCollection();

    public:

        /**

        * Enumeration of states for the plugin.

        */

        enum TComposerState

            {

            EStateIdle,

            EStateFirstOpening,

            EStateOpening,

            EStateActiveLarge,

            EStateActiveSmall,

            EStateCleanup,

            EStateClosing

            };

        /** Current state of the plugin */

        TComposerState iState;

    private:

        /** Isolated collection utility (owned) */

        MMPXCollectionUtility* iCollectionUtility;

        /** Path from collection (owned) */

        CMPXCollectionPath* iPath;

        /** Index of item to thumbnail */

        TInt iCurrentIndex;

        /** Timer to restart Background Harvesting once inactive */

        CGlxThumbnailCompeserInactivityTimer* iInactivityTimer;

        TInt iLastError;

    };

#endif // __CTHUMBNAILCOMPOSERPLUGIN_H__