Function UpdateWidgetSelectedIndex

src/openrct2-ui/scripting/CustomWindow.cpp:1243–1287

    }

    void UpdateWidgetSelectedIndex(WindowBase* w, WidgetIndex widgetIndex, int32_t selectedIndex)
    {
        if (w->classification == WindowClass::custom)
        {
            auto& customInfo = GetInfo(static_cast<CustomWindow*>(w));
            auto customWidgetInfo = customInfo.GetCustomWidgetDesc(w, widgetIndex);
            if (customWidgetInfo != nullptr)
            {
                auto& widget = w->widgets[widgetIndex];

                auto lastSelectedIndex = customWidgetInfo->SelectedIndex;
                if (customWidgetInfo->Items.empty())
                {
                    selectedIndex = -1;
                }
                else
                {
                    if (selectedIndex < 0 || static_cast<size_t>(selectedIndex) >= customWidgetInfo->Items.size())
                    {
                        selectedIndex = 0;
                    }
                }

                if (selectedIndex == -1)
                {
                    widget.string = const_cast<utf8*>("");
                }
                else
                {
                    widget.string = const_cast<utf8*>(customWidgetInfo->Items[selectedIndex].c_str());
                }
                customWidgetInfo->SelectedIndex = selectedIndex;

                auto* windowMgr = GetWindowManager();
                windowMgr->InvalidateWidget(*w, widgetIndex);

                if (lastSelectedIndex != selectedIndex)
                {
                    std::vector<JSValue> args;
                    args.push_back(JS_NewInt32(customWidgetInfo->OnChange.context, selectedIndex));
                    InvokeEventHandler(customInfo.Owner, customWidgetInfo->OnChange, args);
                }
            }
        }
    }

    std::vector<std::string> GetWidgetItems(WindowBase* w, WidgetIndex widgetIndex)
    {