Method DisplayDropdown

src/openrct2-ui/windows/Options.cpp:914–983

        }

        void DisplayDropdown(WidgetIndex widgetIndex, int32_t dropdownIndex)
        {
            switch (widgetIndex)
            {
                case WIDX_RESOLUTION_DROPDOWN:
                {
                    const auto& resolutions = GetContext()->GetUiContext().GetFullscreenResolutions();

                    const Resolution& resolution = resolutions[dropdownIndex];
                    if (resolution.Width != Config::Get().general.fullscreenWidth
                        || resolution.Height != Config::Get().general.fullscreenHeight)
                    {
                        Config::Get().general.fullscreenWidth = resolution.Width;
                        Config::Get().general.fullscreenHeight = resolution.Height;

                        if (Config::Get().general.fullscreenMode == static_cast<int32_t>(FullscreenMode::fullscreen))
                            ContextSetFullscreenMode(static_cast<int32_t>(FullscreenMode::fullscreen));

                        Config::Save();
                        GfxInvalidateScreen();
                    }
                    break;
                }
                case WIDX_FULLSCREEN_DROPDOWN:
                    if (dropdownIndex != Config::Get().general.fullscreenMode)
                    {
                        ContextSetFullscreenMode(dropdownIndex);

                        Config::Get().general.fullscreenMode = static_cast<uint8_t>(dropdownIndex);
                        Config::Save();
                        GfxInvalidateScreen();
                    }
                    break;
                case WIDX_DRAWING_ENGINE_DROPDOWN:
                    if (dropdownIndex != EnumValue(Config::Get().general.drawingEngine))
                    {
                        DrawingEngine dstEngine = static_cast<DrawingEngine>(dropdownIndex);

                        Config::Get().general.drawingEngine = dstEngine;
                        RefreshVideo();
                        Config::Save();
                        invalidate();
                    }
                    break;
                case WIDX_FRAME_RATE_LIMIT_DROPDOWN:
                {
                    auto& config = Config::Get().general;
                    switch (dropdownIndex)
                    {
                        case 0: // vanilla
                            config.uncapFPS = false;
                            config.useVSync = false;
                            break;
                        case 1: // vsync
                            config.uncapFPS = true;
                            config.useVSync = true;
                            break;
                        case 2: // uncapped