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

#ifndef QGRAPHICSSCENEBSPTREE_P_H

#define QGRAPHICSSCENEBSPTREE_P_H

//

//  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.

//

#include <QtCore/qlist.h>

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

#include <QtCore/qrect.h>

#include <QtCore/qset.h>

#include <QtCore/qvector.h>

QT_BEGIN_NAMESPACE

class QGraphicsItem;

class QGraphicsSceneBspTreeVisitor;

class QGraphicsSceneInsertItemBspTreeVisitor;

class QGraphicsSceneRemoveItemBspTreeVisitor;

class QGraphicsSceneFindItemBspTreeVisitor;

class QGraphicsSceneBspTree

{

public:

    struct Node

    {

        enum Type { Horizontal, Vertical, Leaf };

        union {

            qreal offset;

            int leafIndex;

        };

        Type type;

    };

    QGraphicsSceneBspTree();

    ~QGraphicsSceneBspTree();

    void initialize(const QRectF &rect, int depth);

    void clear();

    void insertItem(QGraphicsItem *item, const QRectF &rect);

    void removeItem(QGraphicsItem *item, const QRectF &rect);

    void removeItems(const QSet<QGraphicsItem *> &items);

    QList<QGraphicsItem *> items(const QRectF &rect, bool onlyTopLevelItems = false) const;

    int leafCount() const;

    inline int firstChildIndex(int index) const

    { return index * 2 + 1; }

    inline int parentIndex(int index) const

    { return index > 0 ? ((index & 1) ? ((index - 1) / 2) : ((index - 2) / 2)) : -1; }

    QString debug(int index) const;

private:

    void initialize(const QRectF &rect, int depth, int index);

    void climbTree(QGraphicsSceneBspTreeVisitor *visitor, const QRectF &rect, int index = 0) const;

    QRectF rectForIndex(int index) const;

    QVector<Node> nodes;

    QVector<QList<QGraphicsItem *> > leaves;

    int leafCnt;

    QRectF rect;

    QGraphicsSceneInsertItemBspTreeVisitor *insertVisitor;

    QGraphicsSceneRemoveItemBspTreeVisitor *removeVisitor;

    QGraphicsSceneFindItemBspTreeVisitor *findVisitor;

};

class QGraphicsSceneBspTreeVisitor

{

public:

    virtual ~QGraphicsSceneBspTreeVisitor() { }

    virtual void visit(QList<QGraphicsItem *> *items) = 0;

};

QT_END_NAMESPACE

#endif // QT_NO_GRAPHICSVIEW

#endif // QGRAPHICSSCENEBSPTREE_P_H