1，控件通用

颜色：

GdkColor color;

gdk_color_parse ("颜色(如green,red,blue)", &color);

gtk_widget_modify_text (GTK_WIDGET(控件), GTK_STATE_NORMAL, &color);//文本颜色

gtk_widget_modify_bg (GTK_WIDGET(控件), GTK_STATE_NORMAL, &color);//背景色

gtk_widget_modify_fg (GTK_WIDGET(控件), GTK_STATE_NORMAL, &color);//前景色

字体：

PangoFontDescription *font_desc = pango_font_description_from_string("Sans");  
pango_font_description_set_size (font_desc, 15 * PANGO_SCALE);

gtk_widget_modify_font (GTK_WIDGET(控件),  font_desc);
pango_font_description_free (font_desc);

2, label控件

除了可以用以上程序调整外，还可以用gtk_label_set_markup()函数（功能虽然很强大，但是容易失去控制～不如用方法1。）

gtk_label_set_markup(GTK_LABEL(labelname)),
"<span foreground='red' underline='double' underline_color='blue' font_desc='32'>label for test!</span>");
<span>标签是用来操作label显示的属性，包括背景色，字体色，字体，字体大小,下划线，等等.
其中foreground='red' 就是定义前景色(字体颜色)为红色，也可以foreground='#00FF00'，这两个值是相等的.
underline='double' 是下划线为双线，还可以设值为'none', 'single', 'double', 'low', 'error' 等.
underline_color='blue' 是下划线的颜色.
此外，还可以选的属性有:
font_desc 字体大小，值如'12',官方文档说明为字体描述，但我测试结果为字体大小
size 官方文档为字体大小，但我测试结果不起作用.
stype 样式,值如'normal', 'oblique', 'italic' 等.
weight 字型,值如'ultralight', 'light', 'normal', 'bold', 'ultrabold'等
stretch 拉伸,值如'ultracondensed', 'extracondensed', 'condensed', 'semicondensed', 'normal', 'semiexpanded', 'expanded', 'extraexpanded', 'ultraexpanded' 

SPAN文档：

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_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

A font family name

face

Synonym for font_family

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_desc'; you can use
font_desc='12.5' rather than
size='12800'.

style

One of 'normal', 'oblique', 'italic'

weight

One of 'ultralight', 'light', 'normal', 'bold', 'ultrabold', 'heavy',
or a numeric weight

variant

'normal' or 'smallcaps'

stretch

One of 'ultracondensed', 'extracondensed', 'condensed',
'semicondensed', 'normal', 'semiexpanded', 'expanded',
'extraexpanded', 'ultraexpanded'

foreground

An RGB color specification such as '#00FF00' or a color name such as 
'red'

background

An RGB color specification such as '#00FF00' or a color name such as 
'red'

underline

One of 'none', 'single', 'double', 'low', 'error'

underline_color

The color of underlines; an RGB color specification such as '#00FF00'
or a color name such as 'red'

rise

Vertical displacement, in 10000ths of an em. Can be negative for 
subscript, positive for superscript.

strikethrough

'true' or 'false' whether to strike through the text

strikethrough_color

The color of strikethrough lines; an RGB color specification such as
'#00FF00' or a color name such as 'red'

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.

lang

A language code, indicating the text language

letter_spacing

Inter-letter spacing in 1024ths of a point.

gravity

One of 'south', 'east', 'north', 'west', 'auto'.

gravity_hint

One of 'natural', 'strong', 'line'.

The following convenience tags are provided:

Convenience tags

b

Bold

big

Makes font relatively larger, equivalent to <span size="larger">

i

Italic

s

Strikethrough

sub

Subscript

sup

Superscript

small

Makes font relatively smaller, equivalent to <span size="smaller">

tt

Monospace font

u

Underline

GTK+控件背景颜色，字体颜色大小调整