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virtual QMimeData* mimeData(const QModelIndexList &indexes) const;
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virtual bool setData(const QModelIndex & index,const QVariant & value,int role);
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virtual QModelIndex index(int row,int column,const QModelIndex & parent = QModelIndex()) const;
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virtual bool dropMimeData(const QMimeData *data,Qt::DropAction action,int row,int column,const QModelIndex &parent);
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* Emit the data changed signal