Method OnDropdownSelect

src/settings_gui.cpp:1411–1502

	}

	void OnDropdownSelect(WidgetID widget, int index, int) override
	{
		switch (widget) {
			case WID_GO_CURRENCY_DROPDOWN: // Currency
				if (index == CURRENCY_CUSTOM) ShowCustCurrency();
				this->opt->locale.currency = index;
				ReInitAllWindows(false);
				break;

			case WID_GO_AUTOSAVE_DROPDOWN: // Autosave options
				_settings_client.gui.autosave_interval = _autosave_dropdown_to_minutes[index];
				ChangeAutosaveFrequency(false);
				this->SetDirty();
				break;

			case WID_GO_LANG_DROPDOWN: // Change interface language
				ReadLanguagePack(&_languages[index]);
				CloseWindowByClass(WC_QUERY_STRING);
				CheckForMissingGlyphs();
				ClearAllCachedNames();
				UpdateAllVirtCoords();
				CheckBlitter();
				ReInitAllWindows(false);
				break;

			case WID_GO_RESOLUTION_DROPDOWN: // Change resolution
				if ((uint)index < _resolutions.size() && ChangeResInGame(_resolutions[index].width, _resolutions[index].height)) {
					this->SetDirty();
				}
				break;

			case WID_GO_REFRESH_RATE_DROPDOWN: {
				_settings_client.gui.refresh_rate = *std::next(_refresh_rates.begin(), index);
				if (_settings_client.gui.refresh_rate > 60) {
					/* Show warning to the user that this refresh rate might not be suitable on
					 * larger maps with many NewGRFs and vehicles. */
					ShowErrorMessage(GetEncodedString(STR_GAME_OPTIONS_REFRESH_RATE_WARNING), {}, WL_INFO);
				}
				break;
			}

			case WID_GO_BASE_GRF_DROPDOWN:
				if (_game_mode == GM_MENU) {
					CloseWindowByClass(WC_GRF_PARAMETERS);
					auto set = BaseGraphics::GetSet(index);
					BaseGraphics::SetSet(set);
					this->reload = true;
					this->InvalidateData();
				}
				break;

			case WID_GO_BASE_SFX_DROPDOWN:
				ChangeSoundSet(index);
				break;

			case WID_GO_BASE_MUSIC_DROPDOWN:
				ChangeMusicSet(index);
				break;