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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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 <QtWidgets/private/qtwidgetsglobal_p.h>
#include <QtCore/qlist.h>
#include <QtCore/qrect.h>
#include <QtCore/qset.h>
QT_REQUIRE_CONFIG(graphicsview);
QT_BEGIN_NAMESPACE
class QGraphicsItem;
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);
template<typename Visitor>
void climbTree(Visitor &&visitor, const QRectF &rect, int index = 0) const;
QRectF rectForIndex(int index) const;
QList<Node> nodes;
QList<QList<QGraphicsItem *>> leaves;
int leafCnt;
QRectF rect;
};
QT_END_NAMESPACE
#endif // QGRAPHICSSCENEBSPTREE_P_H
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