Method fitsTreeWidgetSelectionChanged

src/frontend/datasources/FITSOptionsWidget.cpp:57–121

! updates the selected var name of a FITS file when the tree widget item is selected */ TODO

*/
// TODO
void FITSOptionsWidget::fitsTreeWidgetSelectionChanged() {
	QDEBUG(Q_FUNC_INFO << ", SELECTED ITEMS =" << ui.twExtensions->selectedItems());

	if (ui.twExtensions->selectedItems().isEmpty())
		return;

	QTreeWidgetItem* item = ui.twExtensions->selectedItems().first();
	int column = ui.twExtensions->currentColumn();

	WAIT_CURSOR;
	const QString& itemText = item->text(column);
	QString selectedExtension;
	// TODO: same as extensionName() ?
	int extType = 0;
	if (itemText.contains(QLatin1String("IMAGE #")) || itemText.contains(QLatin1String("ASCII_TBL #")) || itemText.contains(QLatin1String("BINARY_TBL #")))
		extType = 1;
	else if (!itemText.compare(i18n("Primary header")))
		extType = 2;
	if (extType == 0) {
		if (item->parent() != nullptr) {
			if (item->parent()->parent() != nullptr)
				selectedExtension = item->parent()->parent()->text(0) + QStringLiteral("[") + item->text(column) + QStringLiteral("]");
		}
	} else if (extType == 1) {
		if (item->parent() != nullptr) {
			if (item->parent()->parent() != nullptr) {
				bool ok;
				int hduNum = itemText.right(1).toInt(&ok);
				selectedExtension = item->parent()->parent()->text(0) + QStringLiteral("[") + QString::number(hduNum - 1) + QStringLiteral("]");
			}
		}
	} else {
		if (item->parent()->parent() != nullptr)
			selectedExtension = item->parent()->parent()->text(column);
	}

	if (!selectedExtension.isEmpty()) {
		auto filter = static_cast<FITSFilter*>(m_fileWidget->currentFileFilter());
		bool readFitsTableToMatrix;
		const QVector<QStringList> importedStrings = filter->readChdu(selectedExtension, &readFitsTableToMatrix, ui.sbPreviewLines->value());
		Q_EMIT m_fileWidget->enableImportToMatrix(readFitsTableToMatrix);

		const int rows = importedStrings.size();
		ui.twPreview->clear();

		ui.twPreview->setRowCount(rows);
		const int maxColumns = 300;
		for (int i = 0; i < rows; ++i) {
			QStringList lineString = importedStrings[i];
			int colCount;
			if (i == 0) {
				colCount = lineString.size() > maxColumns ? maxColumns : lineString.size();
				ui.twPreview->setColumnCount(colCount);
			}
			colCount = lineString.size() > maxColumns ? maxColumns : lineString.size();

			for (int j = 0; j < colCount; ++j) {
				auto* item = new QTableWidgetItem(lineString[j]);