/*

* 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:

*

*/

#include "AknTaskList.h"

#include <apgwgnam.h>

#include "AknPanic.h"

EXPORT_C CAknTaskList* CAknTaskList::NewL(RWsSession& aWsSession)

	{

	CAknTaskList* self = NewLC(aWsSession);

	CleanupStack::Pop(self);

	return self;

	}

EXPORT_C CAknTaskList* CAknTaskList::NewLC(RWsSession& aWsSession)

	{

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

	CleanupStack::PushL(self);

	self->ConstructL();

	return self;

	}

CAknTaskList::CAknTaskList(RWsSession& aWsSession)

: iWs(aWsSession)

	{

	}

void CAknTaskList::ConstructL()

	{

	UpdateListL();

	}

EXPORT_C CAknTaskList::~CAknTaskList()

	{

	iWgs.Close();

	}

EXPORT_C void CAknTaskList::UpdateListL()

	{

	User::LeaveIfError(iWs.WindowGroupList(0, &iWgs));

	}

EXPORT_C const RArray<RWsSession::TWindowGroupChainInfo>& CAknTaskList::WgArray() const

	{

	return iWgs;

	}

EXPORT_C TApaTask CAknTaskList::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;

	}

EXPORT_C TBool CAknTaskList::IsRootWindowGroup(TInt aWgId) const

	{

	TInt count = iWgs.Count();

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

		{

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

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

        if (info.iId == aWgId)

        	return (info.iParentId <= 0);

		}

	return EFalse;

	}

EXPORT_C TInt CAknTaskList::FindParentWgId(TInt aWgId) const

	{

	TInt count = iWgs.Count();

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

		{

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

        if (info.iId == aWgId && info.iParentId > 0 && info.iParentId != info.iId)

        	return info.iParentId;

		}

	return 0;

	}

EXPORT_C TInt CAknTaskList::FindChildWgId(TInt aWgId) const

	{

	TInt count = iWgs.Count();

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

		{

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

        if (info.iParentId == aWgId && info.iId > 0 && info.iParentId != info.iId)

        	return info.iId;

		}

	return 0;

	}