/*

* 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 __CBACKSTEPPING_H

#define __CBACKSTEPPING_H

#include <w32std.h>

#include <tswindowgroupsobserver.h>

class CTsBacksteppingFilter;

NONSHARABLE_CLASS(CTsBackstepping) : public CTsWindowGroupsObserver

{

public:

    static CTsBackstepping* NewL(MTsWindowGroupsMonitor &);

    static CTsBackstepping* NewLC(MTsWindowGroupsMonitor &);

    virtual ~CTsBackstepping();

private:

    CTsBackstepping(MTsWindowGroupsMonitor &);

    void ConstructL();

    void HandleWindowGroupChanged(MTsResourceManager &, 

                                  const TArray<RWsSession::TWindowGroupChainInfo> &);

    void HandleWindowGroupChangedL(MTsResourceManager &, 

                                  const TArray<RWsSession::TWindowGroupChainInfo> &);

    TInt homescreenOffsetL(MTsResourceManager &, 

                           const TArray<RWsSession::TWindowGroupChainInfo> &) const;

    TInt parentOffsetL(TInt, const TArray<RWsSession::TWindowGroupChainInfo> &) const;

    inline TBool isEmbededApp(const RWsSession::TWindowGroupChainInfo&) const;

    TUid getUidFromWindowGroupL(MTsResourceManager &resources, TInt windowGroupId) const;

private:

    CTsBacksteppingFilter *mFilter; 

};

#endif // __CBACKSTEPPING_H