ImportExportHandler(QObject *parent=nullptr)
ImportExportHandler(const ImportExportHandler &)=delete
ImportExportHandler & operator=(const ImportExportHandler &)=delete
virtual ~ImportExportHandler()=default
virtual Q_INVOKABLE void handle_import(Transfer *)=0
virtual Q_INVOKABLE void handle_export(Transfer *)=0
virtual Q_INVOKABLE void handle_share(Transfer *)=0