/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbWidgets module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#include "hbtreeview_p.h"

#include "hbtreeview.h"

#include "hbtreeviewitem.h"

#include "hbtreeitemselectionmodel_p.h"

#include "hbtreemodeliterator_p.h"

const QString KDefaultLayoutOption = "default";

HbTreeViewPrivate::HbTreeViewPrivate() :

    HbAbstractItemViewPrivate(),

    mSelectionStarted(false)

{

}

HbTreeViewPrivate::~HbTreeViewPrivate()

{

}

void HbTreeViewPrivate::init()

{

    Q_Q(HbTreeView);

    q->setClampingStyle(HbScrollArea::StrictClamping);

    q->setFrictionEnabled(0);

    q->setItemRecycling(true);

    q->setScrollDirections(Qt::Horizontal | Qt::Vertical);

    mLayoutOptionName = KDefaultLayoutOption;

    treeModelIterator()->setItemContainer(mContainer, HbTreeViewItem::ExpansionKey);

}

bool HbTreeViewPrivate::isParentValid(const QModelIndex &parent) const

{

    bool valid = false;

    QModelIndex currentParent = parent;

    while (!valid) {

        if (currentParent == mModelIterator->rootIndex()) {

            valid = true;

        } else if (currentParent.isValid()) {

            currentParent = currentParent.parent();

        } else {

            break;

        }

    }

    return valid;

}

bool HbTreeViewPrivate::isChild(const QModelIndex &index, const QModelIndex &parent) const

{

    bool isChild = false;

    QModelIndex currentIndex = index;

    while (!isChild) {

        if (currentIndex.parent() == parent) {

            isChild = true;

        } else if (currentIndex.isValid()) {

            currentIndex = currentIndex.parent();

        } else {

            break;

        }

    }

    return isChild;

}

QModelIndex HbTreeViewPrivate::searchIndexUp( 

                            const   QModelIndex &index,

                            int     maxStepCount) const

{

    Q_Q(const HbTreeView);

    QModelIndex root = q->rootIndex();

    int counter = 1;

    // previousIndex() returns invalid, if root found

    QModelIndex previousIndex = index;

    QModelIndex previousIndexTemp = mModelIterator->previousIndex(previousIndex);

    while (previousIndex.isValid() && counter < maxStepCount) {

        counter++;

        previousIndexTemp = mModelIterator->previousIndex(previousIndex);

        if (previousIndexTemp.isValid()) {

            previousIndex = previousIndexTemp;

        }

    }

    return previousIndex;

}