Method UpdateViewport

libs/map/transit/transit_reader.cpp:319–401

}

void TransitReadManager::UpdateViewport(ScreenBase const & screen)
{
  m_currentModelView = {screen, true /* initialized */};

  if (!m_isSchemeMode || m_isSchemeModeBlocked)
    return;

  if (df::GetDrawTileScale(screen) < kMinSchemeZoomLevel)
  {
    ChangeState(TransitSchemeState::Enabled);
    return;
  }

  auto mwms = m_getMwmsByRectFn(screen.ClipRect());

  m_lastActiveMwms.clear();
  auto const currentTime = steady_clock::now();

  TransitDisplayInfos newTransitData;
  for (auto const & mwmId : mwms)
  {
    if (!mwmId.IsAlive())
      continue;
    m_lastActiveMwms.insert(mwmId);
    auto it = m_mwmCache.find(mwmId);
    if (it == m_mwmCache.end())
    {
      newTransitData[mwmId] = {};
      m_mwmCache.insert(make_pair(mwmId, CacheEntry(currentTime)));
    }
    else
    {
      it->second.m_lastActiveTime = currentTime;
    }
  }

  if (!newTransitData.empty())
  {
    GetTransitDisplayInfo(newTransitData);

    TransitDisplayInfos validTransitData;
    for (auto & [mwmId, transitInfo] : newTransitData)
    {
      if (!transitInfo)
        continue;

      if (transitInfo->m_transitVersion == ::transit::TransitVersion::OnlySubway && transitInfo->m_linesSubway.empty())
        continue;

      if (transitInfo->m_transitVersion == ::transit::TransitVersion::AllPublicTransport &&
          transitInfo->m_linesPT.empty())
        continue;

      auto it = m_mwmCache.find(mwmId);

      it->second.m_isLoaded = true;

      auto const dataSize = CalculateCacheSize(*transitInfo);