/*

 * Copyright (c) 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 :

 *

 */

#ifndef TSWINDOWGROUPSOBSERVER_H

#define TSWINDOWGROUPSOBSERVER_H

#include "tsresourcemanager.h"

/**

 * Interface declare mathods to notify about window server events

 */

class MTsWindowGroupsObserver

{

public:

    /**

     * Method notidy about window group changes.

     * @param rsc - resource manager

     * @param wgs - list of window groups associated with running applications

     */

    virtual void HandleWindowGroupChanged(MTsResourceManager &rsc, 

                                          const TArray<RWsSession::TWindowGroupChainInfo> & wgs) =0;

};

/**

 * Interface declare methods to subscribe windo server events

 */

class MTsWindowGroupsMonitor

{

public:

    /**

     * Method make subscription for window server events

     * @param observer - events observer

     */

    virtual void SubscribeL(MTsWindowGroupsObserver & observer) =0;

    /**

     * Method cancel subscription for window server events

     * @param observer - events observer

     */

    virtual void Cancel(MTsWindowGroupsObserver &) =0;

};

/**

 * Window server observer implementation. Class automaticly subscribe / cancel subscription

 * at construction / destruction level.

 * 

 */

class CTsWindowGroupsObserver: public CBase,

                               public MTsWindowGroupsObserver

{

public:

    /**

     * Destructor

     * Function automaticly cancel subscrption to window server events

     */

    ~CTsWindowGroupsObserver();

protected:

    /**

     * First phase constructor

     */

    CTsWindowGroupsObserver(MTsWindowGroupsMonitor &);

    /**

     * Second phase constructor.

     * Function automaticly subscribe window server events

     */

    void BaseConstructL();

private:

    MTsWindowGroupsMonitor & mMonitor;

};

/**

 * Window server monitor implementation.

 */

class CTsWindowGroupsMonitor: public CActive, 

                              public MTsWindowGroupsMonitor

{

public:

    /**

     * Two phase constructor

     */

    static CTsWindowGroupsMonitor* NewL(MTsResourceManager &);

    /**

     * Destructor

     */

    ~CTsWindowGroupsMonitor();

    /**

     * @see MTsWindowGroupsMonitor::SubscribeL

     */

    void SubscribeL(MTsWindowGroupsObserver &);

    /**

     * @see MTsWindowGroupsMonitor::Cancel

     */

    void Cancel(MTsWindowGroupsObserver &);

protected:

    /**

     * @see CActive::RunL

     */

    void RunL();

    /**

     * @see CActive::DoCancel

     */

    void DoCancel();

    /**

     * @see CActive::RunError

     */

    TInt RunError(TInt error);

private:

    /**

     * First phase constructor

     */

    CTsWindowGroupsMonitor(MTsResourceManager &);

    /**

     * Second phase constructor

     */

    void ConstructL();

    /**

     * Function subscribe for event to window server and activate object

     */

    void Subscribe();

    /**

     * Function provide window server event to observers

     */

    void ProvideEventL();

    /**

     * Function provide window server event to observer

     */

    void ProvideEventL(TWsEvent, MTsWindowGroupsObserver &);

private:

    /**

     * Registry of subscribed observers

     */

    RPointerArray<MTsWindowGroupsObserver> mObservers;

    /**

     * Resources manager

     */

    MTsResourceManager &mResources;

    /**

     * Monitor window group

     */

    RWindowGroup mWg;

};

#endif //TSWINDOWGROUPSOBSERVER_H