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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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
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