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

**

** 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 "hbtreelayout_p_p.h"

#include "hbtreelayout_p.h"

#include "hbabstractitemcontainer_p.h"

#include <hblayoututils_p.h>

#include <hbabstractviewitem.h>

#include <hbtreeview.h>

#include <hbmodeliterator.h>

#include <QWidget> // for QWIDGETSIZE_MAX

#include <QDebug>

const qreal HbTreeLayoutPrivate::INVALID_ITEM_HEIGHT = -1.0;

HbTreeLayoutPrivate::HbTreeLayoutPrivate()

    : q_ptr(0),

    mIndentation(15.0),

    mSmallestItemHeight(INVALID_ITEM_HEIGHT)

{

}

HbTreeLayoutPrivate::~HbTreeLayoutPrivate()

{

}

bool HbTreeLayoutPrivate::uniformSizedItems() const

{

    if (q_ptr->parentLayoutItem() && (static_cast<HbAbstractItemContainer *>(q_ptr->parentLayoutItem()))->uniformItemSizes() ) {

        return true;

    } else {

        return false;

    }

}

/*!

    Calculates the smallest item height from all items.

    Calculations don't consider if there is ongoing animation for items

*/

qreal HbTreeLayoutPrivate::calculateSmallestItemHeight() const

{

    qreal smallestHeight(0);

    if (uniformSizedItems()) {

        QGraphicsLayoutItem *firstItem = mItems.value(0).mItem;

        if (firstItem) {

            smallestHeight = firstItem->preferredHeight();

        }

    } else {

        int itemCount = mItems.count();

        if (itemCount > 0) {

            smallestHeight = mItems.first().mItem->preferredHeight();

        }

        for (int i = 1; i < itemCount; ++i) {

            smallestHeight = qMin(smallestHeight, mItems.at(i).mItem->preferredHeight());

        }

    }

    return smallestHeight;

}

void HbTreeLayoutPrivate::insertItem(int index, QGraphicsLayoutItem *item, int level, bool animate)

{

    Q_UNUSED(animate);

    index = qMin(index, mItems.count());

    if (index < 0) {

        index = mItems.count();

    }

    HbLayoutUtils::addChildItem(q_ptr, item);

    HbTreeLayoutPrivate::TreeItem listItem;

    listItem.mItem = item;

    listItem.mLevel = level;

    mItems.insert(index, listItem);

    q_ptr->invalidate();

}

/*

// For debugging purposes

void HbTreeLayoutPrivate::checkItemListIntegrity()

{

    Q_Q(HbTreeLayout);

    if (!mItems.isEmpty()) {

        HbModelIterator *iterator = qobject_cast<HbTreeView *>(static_cast<QGraphicsWidget *>(q->parentLayoutItem()->graphicsItem())->parentWidget())->modelIterator();

        int previousItemPosition = -1;

        for (int i = 0; i < mItems.count(); ++i) {

            HbAbstractViewItem * item = qobject_cast<HbAbstractViewItem *>(static_cast<QGraphicsWidget *>(mItems.at(i).mItem->graphicsItem()));

            QModelIndex index = item->modelIndex();

            if (index.isValid()) {

                int currentItemPosition = iterator->indexPosition(index);

                if (previousItemPosition != -1 && currentItemPosition != -1) {

                    Q_ASSERT((currentItemPosition == (previousItemPosition + 1)));

                    qDebug() << i << " item model position: " << currentItemPosition;

                }

                previousItemPosition = currentItemPosition;

            }

        }

    }

}

*/