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

**

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

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtCore module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, 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 qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

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

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists for the convenience

// of other Qt classes.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#ifndef QGRAPHICSBSPTREEINDEX_H

#define QGRAPHICSBSPTREEINDEX_H

#include <QtCore/qglobal.h>

#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW

#include "qgraphicssceneindex_p.h"

#include "qgraphicsitem_p.h"

#include "qgraphicsscene_bsp_p.h"

#include <QtCore/qrect.h>

#include <QtCore/qlist.h>

QT_BEGIN_NAMESPACE

static const int QGRAPHICSSCENE_INDEXTIMER_TIMEOUT = 2000;

class QGraphicsScene;

class QGraphicsSceneBspTreeIndexPrivate;

class Q_AUTOTEST_EXPORT QGraphicsSceneBspTreeIndex : public QGraphicsSceneIndex

{

    Q_OBJECT

    Q_PROPERTY(int bspTreeDepth READ bspTreeDepth WRITE setBspTreeDepth)

public:

    QGraphicsSceneBspTreeIndex(QGraphicsScene *scene = 0);

    ~QGraphicsSceneBspTreeIndex();

    QList<QGraphicsItem *> estimateItems(const QRectF &rect, Qt::SortOrder order) const;

    QList<QGraphicsItem *> estimateTopLevelItems(const QRectF &rect, Qt::SortOrder order) const;

    QList<QGraphicsItem *> items(Qt::SortOrder order = Qt::DescendingOrder) const;

    int bspTreeDepth();

    void setBspTreeDepth(int depth);

protected Q_SLOTS:

    void updateSceneRect(const QRectF &rect);

protected:

    bool event(QEvent *event);

    void clear();

    void addItem(QGraphicsItem *item);

    void removeItem(QGraphicsItem *item);

    void prepareBoundingRectChange(const QGraphicsItem *item);

    void itemChange(const QGraphicsItem *item, QGraphicsItem::GraphicsItemChange change, const void *const value);

private :

    Q_DECLARE_PRIVATE(QGraphicsSceneBspTreeIndex)

    Q_DISABLE_COPY(QGraphicsSceneBspTreeIndex)

    Q_PRIVATE_SLOT(d_func(), void _q_updateSortCache())

    Q_PRIVATE_SLOT(d_func(), void _q_updateIndex())

    friend class QGraphicsScene;

    friend class QGraphicsScenePrivate;

};

class QGraphicsSceneBspTreeIndexPrivate : public QGraphicsSceneIndexPrivate

{

    Q_DECLARE_PUBLIC(QGraphicsSceneBspTreeIndex)

public:

    QGraphicsSceneBspTreeIndexPrivate(QGraphicsScene *scene);

    QGraphicsSceneBspTree bsp;

    QRectF sceneRect;

    int bspTreeDepth;

    int indexTimerId;

    bool restartIndexTimer;

    bool regenerateIndex;

    int lastItemCount;

    QList<QGraphicsItem *> indexedItems;

    QList<QGraphicsItem *> unindexedItems;

    QList<QGraphicsItem *> untransformableItems;

    QList<int> freeItemIndexes;

    bool purgePending;

    QSet<QGraphicsItem *> removedItems;

    void purgeRemovedItems();

    void _q_updateIndex();

    void startIndexTimer(int interval = QGRAPHICSSCENE_INDEXTIMER_TIMEOUT);

    void resetIndex();

    void _q_updateSortCache();

    bool sortCacheEnabled;

    bool updatingSortCache;

    void invalidateSortCache();

    void addItem(QGraphicsItem *item, bool recursive = false);

    void removeItem(QGraphicsItem *item, bool recursive = false, bool moveToUnindexedItems = false);

    QList<QGraphicsItem *> estimateItems(const QRectF &, Qt::SortOrder, bool b = false);

    static void climbTree(QGraphicsItem *item, int *stackingOrder);

    static inline bool closestItemFirst_withCache(const QGraphicsItem *item1, const QGraphicsItem *item2)

    {

        return item1->d_ptr->globalStackingOrder < item2->d_ptr->globalStackingOrder;

    }

    static inline bool closestItemLast_withCache(const QGraphicsItem *item1, const QGraphicsItem *item2)

    {

        return item1->d_ptr->globalStackingOrder >= item2->d_ptr->globalStackingOrder;

    }

    static void sortItems(QList<QGraphicsItem *> *itemList, Qt::SortOrder order,

                          bool cached, bool onlyTopLevelItems = false);

};

static inline bool QRectF_intersects(const QRectF &s, const QRectF &r)

{

    qreal xp = s.left();

    qreal yp = s.top();

    qreal w = s.width();

    qreal h = s.height();

    qreal l1 = xp;

    qreal r1 = xp;

    if (w < 0)

        l1 += w;

    else

        r1 += w;

    qreal l2 = r.left();

    qreal r2 = r.left();

    if (w < 0)

        l2 += r.width();

    else

        r2 += r.width();

    if (l1 >= r2 || l2 >= r1)

        return false;

    qreal t1 = yp;

    qreal b1 = yp;

    if (h < 0)

        t1 += h;

    else

        b1 += h;

    qreal t2 = r.top();

    qreal b2 = r.top();

    if (r.height() < 0)

        t2 += r.height();

    else

        b2 += r.height();

    return !(t1 >= b2 || t2 >= b1);

}

QT_END_NAMESPACE

#endif // QT_NO_GRAPHICSVIEW

#endif // QGRAPHICSBSPTREEINDEX_H