Method DrawWidgetLog

src/script/script_gui.cpp:856–900

* Draw the AI/GS log. * @param r Rect area to draw within. */

	 * @param r Rect area to draw within.
	 */
	void DrawWidgetLog(const Rect &r) const
	{
		if (this->filter.script_debug_company == CompanyID::Invalid()) return;

		const ScriptLogTypes::LogData &log = this->GetLogData();
		if (log.empty()) return;

		Rect fr = r.Shrink(WidgetDimensions::scaled.framerect);

		/* Setup a clipping rectangle... */
		DrawPixelInfo tmp_dpi;
		if (!FillDrawPixelInfo(&tmp_dpi, fr)) return;
		/* ...but keep coordinates relative to the window. */
		tmp_dpi.left += fr.left;
		tmp_dpi.top += fr.top;

		AutoRestoreBackup dpi_backup(_cur_dpi, &tmp_dpi);

		fr = ScrollRect(fr, *this->hscroll, 1);

		auto [first, last] = this->vscroll->GetVisibleRangeIterators(log);
		for (auto it = first; it != last; ++it) {
			const ScriptLogTypes::LogLine &line = *it;

			TextColour colour;
			switch (line.type) {
				case ScriptLogTypes::LOG_SQ_INFO:  colour = TC_BLACK;  break;
				case ScriptLogTypes::LOG_SQ_ERROR: colour = TC_WHITE;  break;
				case ScriptLogTypes::LOG_INFO:     colour = TC_BLACK;  break;
				case ScriptLogTypes::LOG_WARNING:  colour = TC_YELLOW; break;
				case ScriptLogTypes::LOG_ERROR:    colour = TC_RED;    break;
				default:                           colour = TC_BLACK;  break;
			}

			/* Check if the current line should be highlighted */
			if (std::distance(std::begin(log), it) == this->highlight_row) {
				fr.bottom = fr.top + this->resize.step_height - 1;
				GfxFillRect(fr, PC_BLACK);
				if (colour == TC_BLACK) colour = TC_WHITE; // Make black text readable by inverting it to white.
			}

			DrawString(fr, line.text, colour, SA_LEFT | SA_FORCE);
			fr.top += this->resize.step_height;
		}
	}

	/**
	 * Update the scrollbar and scroll position of the log panel.