Method applyTimelineStateFromLayout

pj_app/src/MainWindow.cpp:3556–3600

}

void MainWindow::applyTimelineStateFromLayout(const QList<layout_xml::DataSourceRef>& sources) {
  if (sources.isEmpty()) {
    return;
  }
  SessionManager& mgr = session_->sessionManager();

  // Re-bind each saved <fileInfo> to whichever loaded dataset came from that
  // file (DatasetIds are re-minted per session; the path is the stable key),
  // apply its display offset, and collect (id, slot) for the order rebuild.
  std::vector<std::pair<int, DatasetId>> ordered;  // (timeline_order, id)
  for (const layout_xml::DataSourceRef& ref : sources) {
    DatasetId matched = 0;
    for (const auto& [id, name] : session_->catalogModel().datasets()) {
      (void)name;
      const QString src_path = file_loader_->sourcePathForDataset(id);
      if (!src_path.isEmpty() && layout_xml::isSamePath(src_path, ref.resolved_path)) {
        matched = id;
        break;
      }
    }
    if (matched == 0) {
      continue;  // file referenced by the layout isn't loaded — nothing to restore
    }
    if (ref.has_display_offset) {
      mgr.setDisplayOffset(matched, DisplayOffset{Duration{ref.display_offset_ns}});
    }
    if (ref.timeline_order >= 0) {
      ordered.emplace_back(ref.timeline_order, matched);
    }
  }

  // Rebuild the vertical track order from the saved slots. Sorting by the saved
  // index (not document order) keeps the arrangement exact even if <fileInfo>
  // elements were written in load order rather than display order.
  if (source_timeline_controller_ != nullptr && !ordered.empty()) {
    std::sort(ordered.begin(), ordered.end(), [](const auto& a, const auto& b) { return a.first < b.first; });
    std::vector<DatasetId> order;
    order.reserve(ordered.size());
    for (const auto& [slot, id] : ordered) {
      (void)slot;
      order.push_back(id);
    }
    source_timeline_controller_->setDisplayOrder(std::move(order));
  }
}

QDomElement MainWindow::saveSourceTimelineViewState(QDomDocument& doc) const {
  // Read the view chrome off the widgets; layout_xml owns the XML schema.