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| |
| #ifndef QGRAPHICSSCENELINEARINDEX_H |
| #define QGRAPHICSSCENELINEARINDEX_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 <QtWidgets/private/qtwidgetsglobal_p.h> |
| |
| #include <QtCore/qrect.h> |
| #include <QtCore/qlist.h> |
| #include <QtWidgets/qgraphicsitem.h> |
| #include <private/qgraphicssceneindex_p.h> |
| |
| QT_REQUIRE_CONFIG(graphicsview); |
| |
| QT_BEGIN_NAMESPACE |
| |
| class Q_AUTOTEST_EXPORT QGraphicsSceneLinearIndex : public QGraphicsSceneIndex |
| { |
| Q_OBJECT |
| |
| public: |
| QGraphicsSceneLinearIndex(QGraphicsScene *scene = nullptr) : QGraphicsSceneIndex(scene), m_numSortedElements(0) |
| { } |
| |
| QList<QGraphicsItem *> items(Qt::SortOrder order = Qt::DescendingOrder) const override |
| { Q_UNUSED(order); return m_items; } |
| |
| virtual QList<QGraphicsItem *> estimateItems(const QRectF &rect, Qt::SortOrder order) const override |
| { |
| Q_UNUSED(rect); |
| Q_UNUSED(order); |
| return m_items; |
| } |
| |
| protected : |
| virtual void clear() override |
| { |
| m_items.clear(); |
| m_numSortedElements = 0; |
| } |
| |
| virtual void addItem(QGraphicsItem *item) override |
| { m_items << item; } |
| |
| virtual void removeItem(QGraphicsItem *item) override |
| { |
| // Sort m_items if needed |
| if (m_numSortedElements < m_items.size()) |
| { |
| std::sort(m_items.begin() + m_numSortedElements, m_items.end() ); |
| std::inplace_merge(m_items.begin(), m_items.begin() + m_numSortedElements, m_items.end()); |
| m_numSortedElements = m_items.size(); |
| } |
| |
| QList<QGraphicsItem*>::iterator element = std::lower_bound(m_items.begin(), m_items.end(), item); |
| if (element != m_items.end() && *element == item) |
| { |
| m_items.erase(element); |
| --m_numSortedElements; |
| } |
| } |
| |
| private: |
| QList<QGraphicsItem*> m_items; |
| int m_numSortedElements; |
| }; |
| |
| QT_END_NAMESPACE |
| |
| #endif // QGRAPHICSSCENELINEARINDEX_H |