Function firstLeafElement

pj_plotting/widget/src/PlotDocker.cpp:184–193

First leaf-area dock element reachable from `node`, descending into the first child of each splitter. Used to decide between plot-pool and empty-object-widget construction at the top of the restore tree.

// first child of each splitter. Used to decide between plot-pool and
// empty-object-widget construction at the top of the restore tree.
QDomElement firstLeafElement(const LayoutNode& node) {
  const LayoutNode* cur = &node;
  while (cur->type == LayoutNode::Type::kSplitter && !cur->children.isEmpty()) {
    cur = &cur->children.front();
  }
  if (cur->type == LayoutNode::Type::kArea && !cur->plots.isEmpty()) {
    return cur->plots.front();
  }
  return {};
}

// A dock's content element is an object widget (Scene3DDockWidget,
// Scene2DDockWidget, …) when it is present and is not the PlotWidget's own