/*

* 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 interfaces to get notifications from appui and from engine

 *

*/

#ifndef TSFSWOBSERVERS_H

#define TSFSWOBSERVERS_H

/**

 * Interface to get notifications from appui when window groups

 * have changed.

 */

class MTsFswTaskListObserver

    {

public:

    /**

     * Function called by AppUi to notify about possible

     * changes in task list

     */

    virtual void UpdateTaskList() = 0;

    };

/**

 * Interface to get notifications from appui's HandleResourceChangeL.

 */

class MTsFswResourceObserver

    {

public:

    /**

     * Function called by AppUi to notify about resource changes.

     */

    virtual void HandleResourceChange( TInt aType ) = 0;

    };

/**

 * Observer interface to get notifications from engine

 * when fsw content has changed.

 */

class MTsFswEngineObserver

    {

public:

    /**

     * Called when there is a change in the task list.

     */

    virtual void FswDataChanged() = 0;

    /**

     * Called to find out how many clients are subscribed

     * for fsw content change notifications.

     */

    virtual TInt FswDataListenerCount() = 0;

    };

/**

 * This class is interface for CTsFsHiddenAppList

 * to notify about list change

 */

class MTsFsHiddenAppListObserver

    {

public:

    /**

     * This function is called by CTsFsHiddenAppList when list is changed.

     */

    virtual void HiddenAppListUpdated() = 0;

    };

#endif