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39
40#ifndef QGRAPHICSSCENEBSPTREE_P_H
41#define QGRAPHICSSCENEBSPTREE_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of other Qt classes. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtWidgets/private/qtwidgetsglobal_p.h>
55#include <QtCore/qlist.h>
56#include <QtCore/qrect.h>
57#include <QtCore/qset.h>
58
59QT_REQUIRE_CONFIG(graphicsview);
60
61QT_BEGIN_NAMESPACE
62
63class QGraphicsItem;
64class QGraphicsSceneBspTreeVisitor;
65class QGraphicsSceneInsertItemBspTreeVisitor;
66class QGraphicsSceneRemoveItemBspTreeVisitor;
67class QGraphicsSceneFindItemBspTreeVisitor;
68
69class QGraphicsSceneBspTree
70{
71public:
72 struct Node
73 {
74 enum Type { Horizontal, Vertical, Leaf };
75 union {
76 qreal offset;
77 int leafIndex;
78 };
79 Type type;
80 };
81
82 QGraphicsSceneBspTree();
83 ~QGraphicsSceneBspTree();
84
85 void initialize(const QRectF &rect, int depth);
86 void clear();
87
88 void insertItem(QGraphicsItem *item, const QRectF &rect);
89 void removeItem(QGraphicsItem *item, const QRectF &rect);
90 void removeItems(const QSet<QGraphicsItem *> &items);
91
92 QList<QGraphicsItem *> items(const QRectF &rect, bool onlyTopLevelItems = false) const;
93 int leafCount() const;
94
95 inline int firstChildIndex(int index) const
96 { return index * 2 + 1; }
97
98 inline int parentIndex(int index) const
99 { return index > 0 ? ((index & 1) ? ((index - 1) / 2) : ((index - 2) / 2)) : -1; }
100
101 QString debug(int index) const;
102
103private:
104 void initialize(const QRectF &rect, int depth, int index);
105 void climbTree(QGraphicsSceneBspTreeVisitor *visitor, const QRectF &rect, int index = 0) const;
106 QRectF rectForIndex(int index) const;
107
108 QList<Node> nodes;
109 QList<QList<QGraphicsItem *>> leaves;
110 int leafCnt;
111 QRectF rect;
112
113 QGraphicsSceneInsertItemBspTreeVisitor *insertVisitor;
114 QGraphicsSceneRemoveItemBspTreeVisitor *removeVisitor;
115 QGraphicsSceneFindItemBspTreeVisitor *findVisitor;
116};
117
118class QGraphicsSceneBspTreeVisitor
119{
120public:
121 virtual ~QGraphicsSceneBspTreeVisitor() { }
122 virtual void visit(QList<QGraphicsItem *> *items) = 0;
123};
124
125QT_END_NAMESPACE
126
127#endif // QGRAPHICSSCENEBSPTREE_P_H
128