Method OnPaint

src/build_vehicle_gui.cpp:1863–1890

	}

	void OnPaint() override
	{
		this->GenerateBuildList();
		this->vscroll->SetCount(this->eng_list.size());

		this->SetWidgetsDisabledState(this->sel_engine == EngineID::Invalid(), WID_BV_SHOW_HIDE, WID_BV_BUILD);

		/* Disable renaming engines in network games if you are not the server. */
		this->SetWidgetDisabledState(WID_BV_RENAME, this->sel_engine == EngineID::Invalid() || (_networking && !_network_server));

		this->DrawWidgets();

		if (!this->IsShaded()) {
			int needed_height = this->details_height;
			/* Draw details panels. */
			if (this->sel_engine != EngineID::Invalid()) {
				const Rect r = this->GetWidget<NWidgetBase>(WID_BV_PANEL)->GetCurrentRect().Shrink(WidgetDimensions::scaled.framerect);
				int text_end = DrawVehiclePurchaseInfo(r.left, r.right, r.top, this->sel_engine, this->te);
				needed_height = std::max(needed_height, (text_end - r.top) / GetCharacterHeight(FS_NORMAL));
			}
			if (needed_height != this->details_height) { // Details window are not high enough, enlarge them.
				int resize = needed_height - this->details_height;
				this->details_height = needed_height;
				this->ReInit(0, resize * GetCharacterHeight(FS_NORMAL));
				return;
			}
		}
	}

	void OnQueryTextFinished(std::optional<std::string> str) override
	{