Method updateCategories

src/frontend/datasources/ImportDatasetWidget.cpp:226–294

}

void ImportDatasetWidget::updateCategories() {
	m_initializing = true;
	ui.twCategories->clear();

	auto* rootItem = new QTreeWidgetItem(QStringList(i18n("All")));
	ui.twCategories->addTopLevelItem(rootItem);

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

	// add categories
	for (const auto& category : m_model->categories(m_collection)) {
		const bool categoryMatch = (filter.isEmpty() || category.startsWith(filter, Qt::CaseInsensitive));

		if (categoryMatch) {
			auto* const item = new QTreeWidgetItem(QStringList(category));
			rootItem->addChild(item);

			// add all sub-categories
			for (const auto& subcategory : m_model->subcategories(m_collection, category))
				item->addChild(new QTreeWidgetItem(QStringList(subcategory)));
		} else {
			QTreeWidgetItem* item = nullptr;
			for (const auto& subcategory : m_model->subcategories(m_collection, category)) {
				bool subcategoryMatch = subcategory.startsWith(filter, Qt::CaseInsensitive);

				if (subcategoryMatch) {
					if (!item) {
						item = new QTreeWidgetItem(QStringList(category));
						rootItem->addChild(item);
						item->setExpanded(true);
					}
					item->addChild(new QTreeWidgetItem(QStringList(subcategory)));
				} else {
					for (const QString& dataset : m_model->datasets(m_collection, category, subcategory)) {
						bool datasetMatch = dataset.startsWith(filter, Qt::CaseInsensitive);
						if (datasetMatch) {
							if (!item) {
								item = new QTreeWidgetItem(QStringList(category));
								rootItem->addChild(item);
								item->setExpanded(true);
							}
							item->addChild(new QTreeWidgetItem(QStringList(subcategory)));
							break;
						}
					}
				}
			}
		}
	}

	// remote the root item "All" if nothing has matched to the filter string
	if (rootItem->childCount() == 0)
		ui.twCategories->clear();

	// expand the root item and select the first category item
	rootItem->setExpanded(true);
	if (filter.isEmpty()) {
		rootItem->setSelected(true);