summaryrefslogtreecommitdiffstats
path: root/src/gui/graphicsview/qgraphicsscene_bsp_p.h
blob: d371ba5f6633269ebde8b8de9d34ecbe97506801 (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
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#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