Method OnClick

src/industry_gui.cpp:1003–1108

	}

	void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
	{
		switch (widget) {
			case WID_IV_INFO: {
				Industry *i = Industry::Get(this->window_number);
				InfoLine line = IL_NONE;

				switch (this->editable) {
					case EA_NONE: break;

					case EA_MULTIPLIER:
						if (IsInsideBS(pt.y, this->production_offset_y, this->cheat_line_height)) line = IL_MULTIPLIER;
						break;

					case EA_RATE:
						if (pt.y >= this->production_offset_y) {
							int row = (pt.y - this->production_offset_y) / this->cheat_line_height;
							for (auto itp = std::begin(i->produced); itp != std::end(i->produced); ++itp) {
								if (!IsValidCargoType(itp->cargo)) continue;
								row--;
								if (row < 0) {
									line = (InfoLine)(IL_RATE1 + (itp - std::begin(i->produced)));
									break;
								}
							}
						}
						break;
				}
				if (line == IL_NONE) return;

				bool rtl = _current_text_dir == TD_RTL;
				Rect r = this->GetWidget<NWidgetBase>(widget)->GetCurrentRect().Shrink(WidgetDimensions::scaled.framerect).Indent(this->cargo_icon_size.width + WidgetDimensions::scaled.hsep_normal, rtl);

				if (r.WithWidth(SETTING_BUTTON_WIDTH, rtl).Contains(pt)) {
					/* Clicked buttons, decrease or increase production */
					bool decrease = r.WithWidth(SETTING_BUTTON_WIDTH / 2, rtl).Contains(pt);
					switch (this->editable) {
						case EA_MULTIPLIER:
							if (decrease) {
								if (i->prod_level <= PRODLEVEL_MINIMUM) return;
								i->prod_level = static_cast<uint8_t>(std::max<uint>(i->prod_level / 2, PRODLEVEL_MINIMUM));
							} else {
								if (i->prod_level >= PRODLEVEL_MAXIMUM) return;
								i->prod_level = static_cast<uint8_t>(std::min<uint>(i->prod_level * 2, PRODLEVEL_MAXIMUM));
							}
							break;

						case EA_RATE:
							if (decrease) {
								if (i->produced[line - IL_RATE1].rate <= 0) return;
								i->produced[line - IL_RATE1].rate = std::max(i->produced[line - IL_RATE1].rate / 2, 0);
							} else {
								if (i->produced[line - IL_RATE1].rate >= 255) return;
								/* a zero production industry is unlikely to give anything but zero, so push it a little bit */
								int new_prod = i->produced[line - IL_RATE1].rate == 0 ? 1 : i->produced[line - IL_RATE1].rate * 2;
								i->produced[line - IL_RATE1].rate = ClampTo<uint8_t>(new_prod);
							}
							break;