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39 | |
40 | #ifndef QGRAPHICSSCENELINEARINDEX_H |
41 | #define QGRAPHICSSCENELINEARINDEX_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 | |
56 | #include <QtCore/qrect.h> |
57 | #include <QtCore/qlist.h> |
58 | #include <QtWidgets/qgraphicsitem.h> |
59 | #include <private/qgraphicssceneindex_p.h> |
60 | |
61 | QT_REQUIRE_CONFIG(graphicsview); |
62 | |
63 | QT_BEGIN_NAMESPACE |
64 | |
65 | class Q_AUTOTEST_EXPORT QGraphicsSceneLinearIndex : public QGraphicsSceneIndex |
66 | { |
67 | Q_OBJECT |
68 | |
69 | public: |
70 | QGraphicsSceneLinearIndex(QGraphicsScene *scene = nullptr) : QGraphicsSceneIndex(scene), m_numSortedElements(0) |
71 | { } |
72 | |
73 | QList<QGraphicsItem *> items(Qt::SortOrder order = Qt::DescendingOrder) const override |
74 | { Q_UNUSED(order); return m_items; } |
75 | |
76 | virtual QList<QGraphicsItem *> estimateItems(const QRectF &rect, Qt::SortOrder order) const override |
77 | { |
78 | Q_UNUSED(rect); |
79 | Q_UNUSED(order); |
80 | return m_items; |
81 | } |
82 | |
83 | protected : |
84 | virtual void clear() override |
85 | { |
86 | m_items.clear(); |
87 | m_numSortedElements = 0; |
88 | } |
89 | |
90 | virtual void addItem(QGraphicsItem *item) override |
91 | { m_items << item; } |
92 | |
93 | virtual void removeItem(QGraphicsItem *item) override |
94 | { |
95 | // Sort m_items if needed |
96 | if (m_numSortedElements < m_items.size()) |
97 | { |
98 | std::sort(first: m_items.begin() + m_numSortedElements, last: m_items.end() ); |
99 | std::inplace_merge(first: m_items.begin(), middle: m_items.begin() + m_numSortedElements, last: m_items.end()); |
100 | m_numSortedElements = m_items.size(); |
101 | } |
102 | |
103 | QList<QGraphicsItem*>::iterator element = std::lower_bound(m_items.begin(), m_items.end(), item); |
104 | if (element != m_items.end() && *element == item) |
105 | { |
106 | m_items.erase(pos: element); |
107 | --m_numSortedElements; |
108 | } |
109 | } |
110 | |
111 | private: |
112 | QList<QGraphicsItem*> m_items; |
113 | int m_numSortedElements; |
114 | }; |
115 | |
116 | QT_END_NAMESPACE |
117 | |
118 | #endif // QGRAPHICSSCENELINEARINDEX_H |
119 | |