Method GenerateBuildList

src/build_vehicle_gui.cpp:1537–1590

Generate the list of vehicles */

	/* Generate the list of vehicles */
	void GenerateBuildList()
	{
		if (!this->eng_list.NeedRebuild()) return;

		/* Update filter type in case the road/railtype of the depot got converted */
		this->UpdateFilterByTile();

		this->eng_list.clear();

		GUIEngineList list;

		switch (this->vehicle_type) {
			default: NOT_REACHED();
			case VEH_TRAIN:
				this->GenerateBuildTrainList(list);
				GUIEngineListAddChildren(this->eng_list, list);
				this->eng_list.RebuildDone();
				return;
			case VEH_ROAD:
				this->GenerateBuildRoadVehList();
				break;
			case VEH_SHIP:
				this->GenerateBuildShipList();
				break;
			case VEH_AIRCRAFT:
				this->GenerateBuildAircraftList();
				break;
		}

		this->FilterEngineList();

		/* ensure primary engine of variant group is in list after filtering */
		FlatSet<EngineID> variants;
		for (const auto &item : this->eng_list) {
			EngineID parent = item.variant_id;
			while (parent != EngineID::Invalid() && variants.insert(parent).second) {
				parent = Engine::Get(parent)->info.variant_id;
			}
		}

		for (const auto &variant : variants) {
			if (std::ranges::find(this->eng_list, variant, &GUIEngineListItem::engine_id) == this->eng_list.end()) {
				const Engine *e = Engine::Get(variant);
				this->eng_list.emplace_back(variant, e->info.variant_id, e->display_flags | EngineDisplayFlag::Shaded, 0);
			}
		}

		_engine_sort_direction = this->descending_sort_order;
		EngList_Sort(this->eng_list, _engine_sort_functions[this->vehicle_type][this->sort_criteria]);

		this->eng_list.swap(list);
		GUIEngineListAddChildren(this->eng_list, list, EngineID::Invalid(), 0);
		this->eng_list.RebuildDone();
	}

	DropDownList BuildCargoDropDownList() const
	{