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/****************************************************************************
**
** 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QGRAPHICSSCENEINDEX_H
#define QGRAPHICSSCENEINDEX_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 "qgraphicsscene_p.h"
#include "qgraphicsscene.h"
#include <private/qobject_p.h>
#include <QtCore/qnamespace.h>
#include <QtCore/qobject.h>
#include <QtGui/qtransform.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Gui)
#if !defined(QT_NO_GRAPHICSVIEW) || (QT_EDITION & QT_MODULE_GRAPHICSVIEW) != QT_MODULE_GRAPHICSVIEW
class QGraphicsSceneIndexIntersector;
class QGraphicsSceneIndexPointIntersector;
class QGraphicsSceneIndexRectIntersector;
class QGraphicsSceneIndexPathIntersector;
class QGraphicsSceneIndexPrivate;
class QPointF;
class QRectF;
template<typename T> class QList;
class Q_AUTOTEST_EXPORT QGraphicsSceneIndex : public QObject
{
Q_OBJECT
public:
QGraphicsSceneIndex(QGraphicsScene *scene = 0);
virtual ~QGraphicsSceneIndex();
QGraphicsScene *scene() const;
virtual QList<QGraphicsItem *> items(Qt::SortOrder order = Qt::DescendingOrder) const = 0;
virtual QList<QGraphicsItem *> items(const QPointF &pos, Qt::ItemSelectionMode mode,
Qt::SortOrder order, const QTransform &deviceTransform = QTransform()) const;
virtual QList<QGraphicsItem *> items(const QRectF &rect, Qt::ItemSelectionMode mode,
Qt::SortOrder order, const QTransform &deviceTransform = QTransform()) const;
virtual QList<QGraphicsItem *> items(const QPolygonF &polygon, Qt::ItemSelectionMode mode,
Qt::SortOrder order, const QTransform &deviceTransform = QTransform()) const;
virtual QList<QGraphicsItem *> items(const QPainterPath &path, Qt::ItemSelectionMode mode,
Qt::SortOrder order, const QTransform &deviceTransform = QTransform()) const;
virtual QList<QGraphicsItem *> estimateItems(const QPointF &point, Qt::SortOrder order) const;
virtual QList<QGraphicsItem *> estimateItems(const QRectF &rect, Qt::SortOrder order) const = 0;
virtual QList<QGraphicsItem *> estimateTopLevelItems(const QRectF &, Qt::SortOrder order) const;
protected Q_SLOTS:
virtual void updateSceneRect(const QRectF &rect);
protected:
virtual void clear();
virtual void addItem(QGraphicsItem *item) = 0;
virtual void removeItem(QGraphicsItem *item) = 0;
virtual void deleteItem(QGraphicsItem *item);
virtual void itemChange(const QGraphicsItem *item, QGraphicsItem::GraphicsItemChange, const QVariant &value);
virtual void prepareBoundingRectChange(const QGraphicsItem *item);
QGraphicsSceneIndex(QGraphicsSceneIndexPrivate &dd, QGraphicsScene *scene);
friend class QGraphicsScene;
friend class QGraphicsScenePrivate;
friend class QGraphicsItem;
friend class QGraphicsItemPrivate;
friend class QGraphicsSceneBspTreeIndex;
private:
Q_DISABLE_COPY(QGraphicsSceneIndex)
Q_DECLARE_PRIVATE(QGraphicsSceneIndex)
};
class QGraphicsSceneIndexPrivate : public QObjectPrivate
{
Q_DECLARE_PUBLIC(QGraphicsSceneIndex)
public:
QGraphicsSceneIndexPrivate(QGraphicsScene *scene);
~QGraphicsSceneIndexPrivate();
void init();
static bool itemCollidesWithPath(const QGraphicsItem *item, const QPainterPath &path, Qt::ItemSelectionMode mode);
void recursive_items_helper(QGraphicsItem *item, QRectF exposeRect,
QGraphicsSceneIndexIntersector *intersector, QList<QGraphicsItem *> *items,
const QTransform &viewTransform,
Qt::ItemSelectionMode mode, qreal parentOpacity = 1.0) const;
inline void items_helper(const QRectF &rect, QGraphicsSceneIndexIntersector *intersector,
QList<QGraphicsItem *> *items, const QTransform &viewTransform,
Qt::ItemSelectionMode mode, Qt::SortOrder order) const;
QGraphicsScene *scene;
QGraphicsSceneIndexPointIntersector *pointIntersector;
QGraphicsSceneIndexRectIntersector *rectIntersector;
QGraphicsSceneIndexPathIntersector *pathIntersector;
};
inline void QGraphicsSceneIndexPrivate::items_helper(const QRectF &rect, QGraphicsSceneIndexIntersector *intersector,
QList<QGraphicsItem *> *items, const QTransform &viewTransform,
Qt::ItemSelectionMode mode, Qt::SortOrder order) const
{
Q_Q(const QGraphicsSceneIndex);
const QList<QGraphicsItem *> tli = q->estimateTopLevelItems(rect, Qt::AscendingOrder);
for (int i = 0; i < tli.size(); ++i)
recursive_items_helper(tli.at(i), rect, intersector, items, viewTransform, mode);
if (order == Qt::DescendingOrder) {
const int n = items->size();
for (int i = 0; i < n / 2; ++i)
items->swap(i, n - i - 1);
}
}
class QGraphicsSceneIndexIntersector
{
public:
QGraphicsSceneIndexIntersector() { }
virtual ~QGraphicsSceneIndexIntersector() { }
virtual bool intersect(const QGraphicsItem *item, const QRectF &exposeRect, Qt::ItemSelectionMode mode,
const QTransform &deviceTransform) const = 0;
};
#endif // QT_NO_GRAPHICSVIEW
QT_END_NAMESPACE
QT_END_HEADER
#endif // QGRAPHICSSCENEINDEX_H
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