/*

 * 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:  ?Description

 *

 */

#include<apgwgnam.h>

#include"catasklist.h"

CCaTaskList* CCaTaskList::NewL( RWsSession& aWsSession )

    {

    CCaTaskList* self = NewLC( aWsSession );

    CleanupStack::Pop( self );

    return self;

    }

CCaTaskList* CCaTaskList::NewLC( RWsSession& aWsSession )

    {

    CCaTaskList* self = new(ELeave) CCaTaskList( aWsSession );

    CleanupStack::PushL( self );

    self->ConstructL();

    return self;

    }

CCaTaskList::CCaTaskList( RWsSession& aWsSession )

: iWs(aWsSession)

    {

    }

void CCaTaskList::ConstructL()

    {

    UpdateListL();

    }

CCaTaskList::~CCaTaskList()

    {

    iWgs.Close();

    }

void CCaTaskList::UpdateListL()

    {

    User::LeaveIfError( iWs.WindowGroupList( &iWgs ) );

    }

TApaTask CCaTaskList::FindRootApp( TUid aAppUid ) const

    {

    TApaTask task( iWs );

    task.SetWgId(0);        // initialise task to non-existant task

    // wgId = 0 tells FindAppByUid to start looking for apps

    TInt wgId(0);

    FOREVER

        {

        CApaWindowGroupName::FindByAppUid( aAppUid, iWs, wgId );

        // KErrNotFound means that no more apps can be found

        if( wgId == KErrNotFound )

            break;

        if( IsRootWindowGroup( wgId ) )

            {

            // Found a root wg with the right app UID, return it.

            task.SetWgId( wgId );

            break;

            }

        }

    return task;

    }

TBool CCaTaskList::IsRootWindowGroup( TInt aWgId ) const

    {

    TInt count = iWgs.Count();

    for( TInt i=0; i<count; i++ )

        {

        const RWsSession::TWindowGroupChainInfo& info = iWgs[i];

        // find the window group id and check that it has no parent

        if ( info.iId == aWgId )

        	{

            return ( info.iParentId <= 0 );

        	}

        }

    return EFalse;

    }