Text Attribute Markup
Text Attribute Markup — Simple
markup language to encode text with attributes
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Pango Text Attribute Markup Language
Frequently, you want to display some text to the user with attributes
applied to part of the text (for example, you might want bold or
italicized words). With the base Pango interfaces, you could create a
PangoAttrList and apply it to the
text; the problem is that you'd need to apply attributes to some
numeric range of characters, for example "characters 12-17." This is
broken from an internationalization standpoint; once the text is
translated, the word you wanted to italicize could be in a different
position.
The solution is to include the text attributes in the string to be
translated. Pango provides this feature with a small markup language.
You can parse a marked-up string into the string text plus a
PangoAttrList using the function
pango_parse_markup().
A simple example of a marked-up string might be:
"<span foreground="blue" size="x-large">Blue text</span> is <i>cool</i>!"
The root tag of a marked-up document is <markup>, but pango_parse_markup() allows you to
omit this tag, so you will most likely never need to use it. The most
general markup tag is <span>, then there are some convenience
tags. <span> has the following attributes:
<span> attributes
font, font_desc |
A font description string, such as "Sans Italic 12". See
pango_font_description_from_string()
for a description of the format of the string representation . Note that any
other span attributes will override this description. So if you have
"Sans Italic" and also a style="normal" attribute, you will get Sans normal,
not italic. |
font_family, face |
A font family name
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font_size, size |
Font size in 1024ths of a point, or one of the absolute sizes
'xx-small', 'x-small', 'small', 'medium', 'large', 'x-large',
'xx-large', or one of the relative sizes 'smaller' or 'larger'.
If you want to specify a absolute size, it's usually easier
to take advantage of the ability to specify a partial
font description using 'font'; you can use
font='12.5' rather than
size='12800' .
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font_style, style |
One of 'normal', 'oblique', 'italic'
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font_weight, weight |
One of 'ultralight', 'light', 'normal', 'bold', 'ultrabold', 'heavy',
or a numeric weight
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font_variant, variant |
One of 'normal' or 'smallcaps'
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font_stretch, stretch |
One of 'ultracondensed', 'extracondensed', 'condensed',
'semicondensed', 'normal', 'semiexpanded', 'expanded',
'extraexpanded', 'ultraexpanded'
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foreground, fgcolor, color |
An RGB color specification such as '#00FF00' or a color name such as
'red'
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background, bgcolor |
An RGB color specification such as '#00FF00' or a color name such as
'red'
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underline |
One of 'none', 'single', 'double', 'low', 'error'
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underline_color |
The color of underlines; an RGB color specification such as '#00FF00'
or a color name such as 'red'
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rise |
Vertical displacement, in 10000ths of an em. Can be negative for
subscript, positive for superscript.
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strikethrough |
'true' or 'false' whether to strike through the text
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strikethrough_color |
The color of strikethrough lines; an RGB color specification such as
'#00FF00' or a color name such as 'red'
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fallback |
'true' or 'false' whether to enable fallback. If disabled, then characters
will only be used from the closest matching font on the system. No fallback
will be done to other fonts on the system that might contain the characters
in the text. Fallback is enabled by default. Most applications should not
disable fallback.
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lang |
A language code, indicating the text language
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letter_spacing |
Inter-letter spacing in 1024ths of a point.
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gravity |
One of 'south', 'east', 'north', 'west', 'auto'.
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gravity_hint |
One of 'natural', 'strong', 'line'.
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The following convenience tags are provided:
Convenience tags
b |
Bold
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big |
Makes font relatively larger, equivalent to <span size="larger">
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i |
Italic
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s |
Strikethrough
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sub |
Subscript
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sup |
Superscript
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small |
Makes font relatively smaller, equivalent to <span size="smaller">
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tt |
Monospace font
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u |
Underline
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