/*

* Copyright (c) 2008 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:  Observer interface for the plugin handler.

*

*/

#ifndef MPXPLUGINHANDLEROBSERVER_H

#define MPXPLUGINHANDLEROBSERVER_H

// INCLUDES

#include <e32std.h>

/**

*  Mix-in class for callback.

*

*  @lib mpxcommon.lib

*/

NONSHARABLE_CLASS(MMPXPluginHandlerObserver)

    {

public:

    enum TPluginHandlerEvents

        {

        EPluginAdd,             // generated after the plugin DLL is copied

        EPluginUpdateStart,     // generated before the plugin DLL is unloaded (if already loaded)

        EPluginUpdateEnd,       // generated after the new plugin version is loaded (if old version was loaded)

        EPluginRemove           // generated after the plugin DLL is removed but before the plugin instance is unloaded

        };

public:

    /**

    * Indicates a change in the plugins managed by the handler.

    *

    * @since S60 3.2.3

    * @param aEvent event code

    * @param aPluginUid plugin this event is related to

    * @param aLoaded ETrue if the plugin is loaded, EFalse otherwise

    * @param aData data associated with the event, its meaning depends on the event:

    *          EPluginAdd - new plugin version

    *          EPluginUpdateStart - new plugin version

    *          EPluginUpdateEnd - new plugin version

    *          EPluginRemove - old plugin version

    */

    virtual void HandlePluginHandlerEvent(TPluginHandlerEvents aEvent, const TUid& aPluginUid,

        TBool aLoaded, TInt aData) = 0;

    };

#endif // MPXPLUGINHANDLEROBSERVER_H