Method prepareImport

src/backend/spreadsheet/Spreadsheet.cpp:1326–1434

############################################################################## ######################## Data Import ####################################### ##############################################################################

// ########################  Data Import  #######################################
// ##############################################################################
int Spreadsheet::prepareImport(std::vector<void*>& dataContainer,
							   AbstractFileFilter::ImportMode importMode,
							   int actualRows,
							   int actualCols,
							   const QStringList& colNameList,
							   const QVector<AbstractColumn::ColumnMode>& columnMode,
							   bool& ok,
							   bool initializeContainer) {
	Q_D(Spreadsheet);
	PERFTRACE(QLatin1String(Q_FUNC_INFO));
	DEBUG(Q_FUNC_INFO << ", resize spreadsheet to rows = " << actualRows << " and cols = " << actualCols)
	QDEBUG(Q_FUNC_INFO << ", column name list = " << colNameList)
	assert(d->m_usedInPlots.size() == 0);
	int columnOffset = 0;
	setUndoAware(false);
	if (m_model != nullptr)
		m_model->suppressSignals(true);

	// make the available columns undo unaware before we resize and rename them below,
	// the same will be done for new columns in this->resize().
	{
		const auto& columns = children<Column>();
		for (auto* column : std::as_const(columns))
			column->setUndoAware(false);
	}

	columnOffset = this->resize(importMode, colNameList, actualCols);
	if (initializeContainer)
		dataContainer.resize(actualCols);
	const auto& columns = children<Column>(); // Get new children because of the resize it might be different

	// resize the spreadsheet
	if (initializeContainer) {
		try {
			if (importMode == AbstractFileFilter::ImportMode::Replace) {
				clear();
				setRowCount(actualRows);
			} else {
				if (rowCount() < actualRows)
					setRowCount(actualRows);
			}
		} catch (std::bad_alloc&) {
			ok = false;
			return 0;
		}
	}

	if (columnMode.size() < actualCols) {
		QDEBUG(Q_FUNC_INFO << ", columnMode[] size " << columnMode.size() << " is too small, should be " << actualCols << "! Giving up.");
		return -1;
	}

	for (int n = 0; n < actualCols; n++) {
		// data() returns a void* which is a pointer to any data type (see ColumnPrivate.cpp)
		auto* column = columns.at(columnOffset + n);
		DEBUG(" column " << n << " columnMode = " << ENUM_TO_STRING(AbstractColumn, ColumnMode, columnMode[n]));
		column->setColumnModeFast(columnMode[n]);