mirror of
https://github.com/status-im/QtModelsToolkit.git
synced 2026-08-31 10:01:15 +00:00
Alex Jbanca
c503073f6b
The right model data access is expensive because we need to search the right model for a matching key on every `data` call. This commit adds a LRU cache to the `data` call, storing by default up to 1000 rows. The cache mechanism uses a QCache for fast index lookup and a std::list to preserve the access order and to ensure a controlled cache removal. + fix compilation errors on ConcatModel and WritableProxyModel
91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
#pragma once
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#include <QAbstractListModel>
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#include <QPointer>
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#include <QCache>
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namespace qtmt {
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class LeftJoinModel : public QAbstractListModel
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{
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Q_OBJECT
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Q_PROPERTY(QAbstractItemModel* leftModel READ leftModel
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WRITE setLeftModel NOTIFY leftModelChanged)
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Q_PROPERTY(QAbstractItemModel* rightModel READ rightModel
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WRITE setRightModel NOTIFY rightModelChanged)
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Q_PROPERTY(QString joinRole READ joinRole
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WRITE setJoinRole NOTIFY joinRoleChanged)
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Q_PROPERTY(QStringList rolesToJoin READ rolesToJoin
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WRITE setRolesToJoin NOTIFY rolesToJoinChanged)
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Q_PROPERTY(qsizetype cacheSize READ cacheSize WRITE setCacheSize NOTIFY cacheSizeChanged)
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public:
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explicit LeftJoinModel(QObject* parent = nullptr);
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void setLeftModel(QAbstractItemModel* model);
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QAbstractItemModel* leftModel() const;
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void setRightModel(QAbstractItemModel* model);
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QAbstractItemModel* rightModel() const;
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void setJoinRole(const QString& joinRole);
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const QString& joinRole() const;
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void setRolesToJoin(const QStringList& roles);
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const QStringList& rolesToJoin() const;
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qsizetype cacheSize() const;
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void setCacheSize(qsizetype size);
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int rowCount(const QModelIndex &parent = QModelIndex()) const override;
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QHash<int, QByteArray> roleNames() const override;
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QVariant data(const QModelIndex& index, int role) const override;
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signals:
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void leftModelChanged();
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void rightModelChanged();
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void joinRoleChanged();
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void rolesToJoinChanged();
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void cacheSizeChanged();
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private:
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void initializeIfReady(bool reset);
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void initialize(bool reset);
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void connectLeftModelSignals();
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void connectRightModelSignals();
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void clearCache();
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int m_rightModelRolesOffset = 0;
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QHash<int, QByteArray> m_leftRoleNames;
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QHash<int, QByteArray> m_rightRoleNames;
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QHash<int, QByteArray> m_roleNames;
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mutable bool m_rolesFetched = false;
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QVector<int> m_joinedRoles;
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QString m_joinRole;
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QStringList m_rolesToJoin;
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int m_leftModelJoinRole = 0;
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int m_rightModelJoinRole = 0;
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QPointer<QAbstractItemModel> m_leftModel;
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QPointer<QAbstractItemModel> m_rightModel;
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bool m_initialized = false;
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// LRU cache for right model
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qsizetype m_cacheSize = 1000;
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mutable QCache<QVariant, QPersistentModelIndex> m_rightModelCache;
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// helpers for handling layoutChanged from source
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QList<QPersistentModelIndex> m_layoutChangePersistentIndexes;
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QModelIndexList m_proxyIndexes;
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};
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} // namespace qtmt
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