Method OnClick

src/rail_gui.cpp:1558–1613

	}

	void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
	{
		switch (widget) {
			case WID_BS_SEMAPHORE_NORM:
			case WID_BS_SEMAPHORE_ENTRY:
			case WID_BS_SEMAPHORE_EXIT:
			case WID_BS_SEMAPHORE_COMBO:
			case WID_BS_SEMAPHORE_PBS:
			case WID_BS_SEMAPHORE_PBS_OWAY:
			case WID_BS_ELECTRIC_NORM:
			case WID_BS_ELECTRIC_ENTRY:
			case WID_BS_ELECTRIC_EXIT:
			case WID_BS_ELECTRIC_COMBO:
			case WID_BS_ELECTRIC_PBS:
			case WID_BS_ELECTRIC_PBS_OWAY:
				this->RaiseWidget((_cur_signal_variant == SIG_ELECTRIC ? WID_BS_ELECTRIC_NORM : WID_BS_SEMAPHORE_NORM) + _cur_signal_type);

				_cur_signal_type = (SignalType)((uint)((widget - WID_BS_SEMAPHORE_NORM) % (SIGTYPE_LAST + 1)));
				_cur_signal_variant = widget >= WID_BS_ELECTRIC_NORM ? SIG_ELECTRIC : SIG_SEMAPHORE;

				/* Update default (last-used) signal type in config file. */
				_settings_client.gui.default_signal_type = _cur_signal_type;

				/* If 'remove' button of rail build toolbar is active, disable it. */
				if (_remove_button_clicked) {
					Window *w = FindWindowById(WC_BUILD_TOOLBAR, TRANSPORT_RAIL);
					if (w != nullptr) ToggleRailButton_Remove(w);
				}

				SndClickBeep();
				break;

			case WID_BS_CONVERT:
				_convert_signal_button = !_convert_signal_button;
				SndClickBeep();
				break;

			case WID_BS_DRAG_SIGNALS_DENSITY_DECREASE:
				if (_settings_client.gui.drag_signals_density > 1) {
					_settings_client.gui.drag_signals_density--;
					SetWindowDirty(WC_GAME_OPTIONS, WN_GAME_OPTIONS_GAME_SETTINGS);
				}
				break;

			case WID_BS_DRAG_SIGNALS_DENSITY_INCREASE:
				if (_settings_client.gui.drag_signals_density < 20) {
					_settings_client.gui.drag_signals_density++;
					SetWindowDirty(WC_GAME_OPTIONS, WN_GAME_OPTIONS_GAME_SETTINGS);
				}
				break;

			default: break;
		}

		this->InvalidateData();
	}

	/**