Method Draw

src/settingentry_gui.cpp:91–123

* Draw a row in the settings panel. * * The scrollbar uses rows of the page, while the page data structure is a tree of #SettingsPage and #SettingEntry objects. * As a result, the drawing routing traverses the tree from top to bottom, counting rows in \a cur_row until it reaches \a first_row. * Then it enables drawing rows while traversing until \a max_row is reached, at which point drawing is

 * @return Row number of the next row to draw
 */
uint BaseSettingEntry::Draw(GameSettings *settings_ptr, int left, int right, int y, uint first_row, uint max_row, BaseSettingEntry *selected, uint cur_row, uint parent_last) const
{
	if (this->IsFiltered()) return cur_row;
	if (cur_row >= max_row) return cur_row;

	bool rtl = _current_text_dir == TD_RTL;
	int offset = (rtl ? -static_cast<int>(BaseSettingEntry::circle_size.width) : static_cast<int>(BaseSettingEntry::circle_size.width)) / 2;
	int level_width = rtl ? -WidgetDimensions::scaled.hsep_indent : WidgetDimensions::scaled.hsep_indent;

	int x = rtl ? right : left;
	if (cur_row >= first_row) {
		PixelColour colour = GetColourGradient(COLOUR_ORANGE, SHADE_NORMAL);
		y += (cur_row - first_row) * BaseSettingEntry::line_height; // Compute correct y start position

		/* Draw vertical for parent nesting levels */
		for (uint lvl = 0; lvl < this->level; lvl++) {
			if (!HasBit(parent_last, lvl)) GfxDrawLine(x + offset, y, x + offset, y + BaseSettingEntry::line_height - 1, colour);
			x += level_width;
		}
		/* draw own |- prefix */
		int halfway_y = y + BaseSettingEntry::line_height / 2;
		int bottom_y = flags.Test(SettingEntryFlag::LastField) ? halfway_y : y + BaseSettingEntry::line_height - 1;
		GfxDrawLine(x + offset, y, x + offset, bottom_y, colour);
		/* Small horizontal line from the last vertical line */
		GfxDrawLine(x + offset, halfway_y, x + level_width - (rtl ? -WidgetDimensions::scaled.hsep_normal : WidgetDimensions::scaled.hsep_normal), halfway_y, colour);
		x += level_width;

		this->DrawSetting(settings_ptr, rtl ? left : x, rtl ? x : right, y, this == selected);
	}
	cur_row++;

	return cur_row;
}

/* == SettingEntry methods == */