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virtual Qt::ItemFlags readWriteFlags(const QModelIndex &index) const;
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/** calls readWriteFlags() by default */
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virtual Qt::ItemFlags flags(const QModelIndex &index) const;
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virtual QString orderByClause() const;
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virtual void initHeaderData();
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void trackChanged(int trackId);
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QVariant getBaseValue(const QModelIndex& index, int role = Qt::DisplayRole) const;