Method mqttMessageReceived

src/frontend/datasources/ImportFileWidget.cpp:2762–2852

! *\brief called when the client receives a message * if the message arrived from a new topic, the topic is put in twTopics */

 * if the message arrived from a new topic, the topic is put in twTopics
 */
void ImportFileWidget::mqttMessageReceived(const QByteArray& /*message*/, const QMqttTopicName& topic) {
	// 	qDebug()<<"received " << topic.name();
	if (m_addedTopics.contains(topic.name()))
		return;

	m_addedTopics.push_back(topic.name());
	m_subscriptionWidget->setTopicTreeText(i18n("Available (%1)", m_addedTopics.size()));
	QStringList name;
	QString rootName;
	const QChar sep = QLatin1Char('/');

	if (topic.name().contains(sep)) {
		const QStringList& list = topic.name().split(sep, Qt::SkipEmptyParts);

		if (!list.isEmpty()) {
			rootName = list.at(0);
			name.append(list.at(0));
			int topItemIdx = -1;
			// check whether the first level of the topic can be found in twTopics
			for (int i = 0; i < m_subscriptionWidget->topicCount(); ++i) {
				if (m_subscriptionWidget->topLevelTopic(i)->text(0) == list.at(0)) {
					topItemIdx = i;
					break;
				}
			}

			// if not we simply add every level of the topic to the tree
			if (topItemIdx < 0) {
				auto* currentItem = new QTreeWidgetItem(name);
				m_subscriptionWidget->addTopic(currentItem);
				for (int i = 1; i < list.size(); ++i) {
					name.clear();
					name.append(list.at(i));
					currentItem->addChild(new QTreeWidgetItem(name));
					currentItem = currentItem->child(0);
				}
			}
			// otherwise we search for the first level that isn't part of the tree,
			// then add every level of the topic to the tree from that certain level
			else {
				QTreeWidgetItem* currentItem = m_subscriptionWidget->topLevelTopic(topItemIdx);
				int listIdx = 1;
				for (; listIdx < list.size(); ++listIdx) {
					QTreeWidgetItem* childItem = nullptr;
					bool found = false;
					for (int j = 0; j < currentItem->childCount(); ++j) {
						childItem = currentItem->child(j);
						if (childItem->text(0) == list.at(listIdx)) {
							found = true;
							currentItem = childItem;
							break;
						}
					}
					if (!found) {
						// this is the level that isn't present in the tree
						break;
					}
				}