Method setUpdateType

src/backend/datasources/LiveDataSource.cpp:326–359

! * \brief Sets the source's update type to updatetype and handles this change * \param updatetype */

 * \param updatetype
 */
void LiveDataSource::setUpdateType(UpdateType updatetype) {
	switch (updatetype) {
	case UpdateType::NewData: {
		m_updateTimer->stop();
		if (!m_fileSystemWatcher)
			m_fileSystemWatcher = new QFileSystemWatcher(this);

		m_fileSystemWatcher->addPath(m_fileName);

		QFileInfo file(m_fileName);
		// If the watched file currently does not exist (because it is recreated for instance), watch its containing
		// directory instead. Once the file exists again, switch to watching the file in readOnUpdate().
		// Reading will only start 100ms after the last update, to prevent continuous re-reading while the file is updated.
		// If the watched file intentionally is updated more often than that, the user should switch to periodic reading.
		if (m_fileSystemWatcher->files().contains(m_fileName))
			m_fileSystemWatcher->removePath(file.absolutePath());
		else
			m_fileSystemWatcher->addPath(file.absolutePath());

		connect(m_fileSystemWatcher, &QFileSystemWatcher::fileChanged, this, [&]() {
			m_watchTimer->start();
		});
		connect(m_fileSystemWatcher, &QFileSystemWatcher::directoryChanged, this, [&]() {
			m_watchTimer->start();
		});
		break;
	}
	case UpdateType::TimeInterval:
		delete m_fileSystemWatcher;
		m_fileSystemWatcher = nullptr;
		break;
	}
	m_updateType = updatetype;
}

LiveDataSource::UpdateType LiveDataSource::updateType() const {
	return m_updateType;