# File lib/spreadsheet/format.rb, line 298 def font_key key = @font.to_s + @size.to_s + @font_script.to_s + @underline.to_s key += @font_strikeout.to_s + @bold.to_s + @font_outline.to_s key += @font_family.to_s + @font_charset.to_s + @font_shadow.to_s key += @color.to_s + @italic.to_s return key end