Method updateDatasets

src/frontend/datasources/ImportDatasetWidget.cpp:300–344

* @brief Populates lwDatasets with the datasets of the selected subcategory or its parent * @param item the selected subcategory */

 * @param item the selected subcategory
 */
void ImportDatasetWidget::updateDatasets(QTreeWidgetItem* item) {
	m_initializing = true;
	ui.lwDatasets->clear();

	if (!item) {
		// no category item is selected because nothing matches the search string
		m_initializing = false;
		datasetChanged();
		return;
	}

	const QString& filter = ui.leSearch->text();

	if (item->childCount() == 0) {
		// sub-category was selected -> show all its datasets
		m_category = item->parent()->text(0);
		m_subcategory = item->text(0);

		addDatasetItems(m_collection, m_category, m_subcategory, filter);
	} else {
		if (!item->parent()) {
			// top-level item "All" was selected -> show datasets for all categories and their sub-categories
			m_category = QString();
			m_subcategory = QString();

			for (const auto& category : m_model->categories(m_collection)) {
				for (const auto& subcategory : m_model->subcategories(m_collection, category))
					addDatasetItems(m_collection, category, subcategory, filter);
			}
		} else {
			// a category was selected -> show all its datasets
			m_category = item->text(0);
			m_subcategory = QString();

			for (const auto& subcategory : m_model->subcategories(m_collection, m_category))
				addDatasetItems(m_collection, m_category, subcategory, filter);
		}
	}

	m_initializing = false;

	// select the first available dataset
	if (ui.lwDatasets->count())
		ui.lwDatasets->setCurrentRow(0);
}

void ImportDatasetWidget::addDatasetItems(const QString& collection, const QString& category, const QString& subcategory, const QString& filter) {
	if (!filter.isEmpty() && (category.startsWith(filter, Qt::CaseInsensitive) || subcategory.startsWith(filter, Qt::CaseInsensitive))) {