summaryrefslogtreecommitdiffstats
path: root/src/gui/graphicsview/qgraphicssceneindex_p.h
blob: def58f01fb843e983ca79ee5f7a55c4957584d14 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/****************************************************************************
**
** 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