Qt 的文本 Widget 能够显示富文本，使用指定子集 HTML 4 标记。Widget 使用 QTextDocument ，譬如 QLabel and QTextEdit ，能够显示以此方式指定的富文本。
Widgets automatically detect HTML markup and display rich text accordingly. For example, setting a label's
text
property with the string
"<b>Hello</b> <i>Qt!</i>"
will result in the label displaying text like this:
Hello
Qt!
When HTML markup is used for text, Qt follows the rules defined by the
HTML 4
specification. This includes default properties for text layout, such as the direction of the text flow (left-to-right) which can be changed by applying the
dir
attribute to blocks of text.
下表列出的 HTML 标签支持通过 Qt 的 富文本 引擎：
| Tag | 描述 | 注释 |
|---|---|---|
a
|
锚点或链接 |
支持
href
and
名称
属性。
|
address
|
地址 | |
b
|
Bold | |
big
|
Larger font | |
blockquote
|
Indented paragraph | |
body
|
Document body |
支持
bgcolor
attribute, which can be a Qt
颜色名称
或
#RRGGBB
color specification.
|
br
|
Line break | |
center
|
Centered paragraph | |
cite
|
Inline citation |
如同
i
.
|
code
|
Code |
如同
tt
.
|
dd
|
Definition data | |
dfn
|
定义 |
如同
i
.
|
div
|
Document division | 支持标准 块属性 . |
dl
|
Definition list | 支持标准 块属性 . |
dt
|
Definition term | 支持标准 块属性 . |
em
|
Emphasized |
如同
i
.
|
font
|
Font size, family, and/or color |
支持下列属性：
size
,
face
，和
color
(Qt
color names
or
#RRGGBB
).
|
h1
|
Level 1 heading | 支持标准 块属性 . |
h2
|
Level 2 heading | 支持标准 块属性 . |
h3
|
Level 3 heading | 支持标准 块属性 . |
h4
|
Level 4 heading | 支持标准 块属性 . |
h5
|
Level 5 heading | 支持标准 块属性 . |
h6
|
Level 6 heading | 支持标准 块属性 . |
head
|
文档 Header (头) | |
hr
|
Horizontal line |
支持
width
attribute, which can be specified as an absolute or relative (
%
) 值。
|
html
|
HTML 文档 | |
i
|
Italic | |
img
|
图像 |
支持
src
,
source
(for Qt 3 compatibility),
width
，和
height
属性。
|
kbd
|
User-entered text | |
meta
|
Meta-information |
If a text encoding is specified using the
meta
tag, it is picked up by Qt::codecForHtml(). Likewise, if an encoding is specified to
QTextDocument::toHtml
(), the encoding is stored using a
meta
tag, for example:
<meta http-equiv="Content-Type" content="text/html; charset=EUC-JP" />
|
li
|
List item | |
nobr
|
Non-breakable text | |
ol
|
Ordered list | 支持标准 列表属性 . |
p
|
Paragraph | Left-aligned by default. Supports the standard 块属性 . |
pre
|
Preformated text | |
qt
|
Qt rich-text document |
同义词
html
. Provided for compatibility with earlier versions of Qt.
|
s
|
Strikethrough | |
samp
|
Sample code |
如同
tt
.
|
small
|
Small font | |
span
|
Grouped elements | |
strong
|
Strong |
如同
b
.
|
sub
|
Subscript | |
sup
|
Superscript | |
table
|
Table |
支持下列属性：
border
,
bgcolor
(Qt
color names
or
#RRGGBB
),
cellspacing
,
cellpadding
,
width
(absolute or relative), and
height
.
|
tbody
|
表格本体 | 什么都不做。 |
td
|
表数据单元格 | 支持标准 表单元格属性 . |
tfoot
|
Table footer | 什么都不做。 |
th
|
Table header cell | 支持标准 表单元格属性 . |
thead
|
Table header |
若
thead
tag is specified, it is used when printing tables that span multiple pages.
|
title
|
文档标题 |
The value specified using the
title
tag is available through
QTextDocument::metaInformation
().
|
tr
|
表格行 |
支持
bgcolor
attribute, which can be a Qt
颜色名称
或
#RRGGBB
color specification.
|
tt
|
Typewrite font | |
u
|
Underlined | |
ul
|
Unordered list | 支持标准 列表属性 . |
var
|
变量 |
如同
i
.
|
The following attributes are supported by the
div
,
dl
,
dt
,
h1
,
h2
,
h3
,
h4
,
h5
,
h6
,
p
tags:
align
(
left
,
right
,
center
,
justify
)
dir
(
ltr
,
rtl
)
The following attribute is supported by the
ol
and
ul
tags:
type
(
1
,
a
,
A
,
square
,
disc
,
circle
)
The following attributes are supported by the
td
and
th
tags:
width
(absolute, relative, or no-value)
bgcolor
(Qt
color names
or
#RRGGBB
)
colspan
rowspan
align
(
left
,
right
,
center
,
justify
)
valign
(
top
,
middle
,
bottom
)
The following table lists the CSS properties supported by Qt's 富文本 引擎：
| 特性 | 值 | 描述 |
|---|---|---|
background-color
|
<color> | Background color for elements |
background-image
|
<uri> | Background image for elements |
color
|
<color> | Text foreground color |
font-family
|
<family name> | Font family name |
font-size
|
[ small | medium | large | x-large | xx-large ] | <size>pt | <size>px | Font size relative to the document font, or specified in points or pixels |
font-style
|
[ normal | italic | oblique ] | |
font-weight
|
[ normal | bold | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 ] |
Specifies the font weight used for text, where
normal
and
bold
are mapped to the corresponding
QFont
weights. Numeric values are 8 times the equivalent
QFont
weight values.
|
text-decoration
|
none | [ underline || overline || line-through ] | 额外文本效果 |
font
|
[ [ <'font-style'> || <'font-weight'> ]? <'font-size'> <'font-family'> ] | Font shorthand property |
text-indent
|
<length>px | First line text indentation in pixels |
white-space
|
normal | pre | nowrap | pre-wrap | Declares how whitespace in HTML is handled. |
margin-top
|
<length>px | Top paragraph margin in pixels |
margin-bottom
|
<length>px | Bottom paragraph margin in pixels |
margin-left
|
<length>px | Left paragraph margin in pixels |
margin-right
|
<length>px | Right paragraph margin in pixels |
padding-top
|
<length>px | Top table cell padding in pixels |
padding-bottom
|
<length>px | Bottom table cell padding in pixels |
padding-left
|
<length>px | Left table cell padding in pixels |
padding-right
|
<length>px | Right table cell padding in pixels |
padding
|
<length>px | Shorthand for setting all the padding properties at once. |
vertical-align
|
baseline | sub | super | middle | top | bottom | Vertical text alignment. For vertical alignment in text table cells only middle, top, and bottom apply. |
border-collapse
|
collapse | separate | Border Collapse mode for text tables. If set to collapse, cell-spacing will not be applied. |
border-color
|
<color> | Border color for text tables and table cells. |
border-top-color
|
<color> | Top border color for table cells. |
border-bottom-color
|
<color> | Bottom border color for table cells. |
border-left-color
|
<color> | Left border color for table cells. |
border-right-color
|
<color> | Right border color for table cells. |
border-style
|
none | dotted | dashed | dot-dash | dot-dot-dash | solid | double | groove | ridge | inset | outset | Border style for text tables and table cells. |
border-top-style
|
<border-style> | Top border style for table cells. |
border-bottom-style
|
<border-style> | Bottom border style for table cells. |
border-left-style
|
<border-style> | Left border style for table cells. |
border-right-style
|
<border-style> | Right border style for table cells. |
border-width
|
<width>px | Width of table or cell border |
border-top-width
|
<length>px | Top border width for table cells. |
border-bottom-width
|
<length>px | Bottom border width for table cells. |
border-left-width
|
<length>px | Left border width for table cells. |
border-right-width
|
<length>px | Right border width for table cells. |
border-top
|
<width>px <border-style> <border-color> | Shorthand for setting top border width, style and color |
border-bottom
|
<width>px <border-style> <border-color> | Shorthand for setting bottom border width, style and color |
border-left
|
<width>px <border-style> <border-color> | Shorthand for setting left border width, style and color |
border-right
|
<width>px <border-style> <border-color> | Shorthand for setting right border width, style and color |
border-top
|
<width>px <border-style> <border-color> | Shorthand for setting top border width, style and color |
border-bottom
|
<width>px <border-style> <border-color> | Shorthand for setting bottom border width, style and color |
border
|
<width>px <border-style> <border-color> | Shorthand for setting all four border's width, style and color |
background
|
[ <'background-color'> || <'background-image'> ] | Background shorthand property |
page-break-before
|
[ auto | always ] | Make it possible to enforce a page break before the paragraph/table |
page-break-after
|
[ auto | always ] | Make it possible to enforce a page break after the paragraph/table |
float
|
[ left | right | none ] |
Specifies where an image or a text will be placed in another element. Note that the
float
property is only supported for tables and images.
|
text-transform
|
[ uppercase | lowercase ] | Select the transformation that will be performed on the text prior to displaying it. |
font-kerning
|
[ normal | none ] | Enables or disables kerning between text characters. |
font-variant
|
small-caps | Perform the smallcaps transformation on the text prior to displaying it. |
word-spacing
|
<width>px | Specifies an alternate spacing between each word. |
line-height
|
<number>[% | px | pt | cm] |
Specifies the height of a line. It can be one of the following:
|
Besides the standard CSS properties listed earlier, the following Qt-specific properties can also be used to style a text block:
| 特性 | 值 | 描述 |
|---|---|---|
-qt-block-indent
|
<number>
|
Indents the text block by the specified no. spaces. |
-qt-list-indent
|
<number>
|
Indents the list items by the specified no. of spaces. |
-qt-list-number-prefix
|
<string>
|
Prefixes the given string to list number in an HTML ordered list. |
-qt-list-number-suffix
|
<string> | Suffixes the given string to list number in an HTML ordered list. |
-qt-paragraph-type
|
empty
|
Hides the text block. |
-qt-table-type
|
root | frame
|
root
renders the text blocks inline without borders and indentation, whereas
frame
renders them on a new line with a frame around.
|
-qt-user-state
|
<number>
|
Adds it as user data for the text block. |
All CSS 2.1 selector classes are supported except pseudo-class selectors such as
:first-child
,
:visited
and
:hover
.