QFont class specifies a font used for drawing text. 更多...
| 头： | #include <QFont> |
| qmake: | QT += gui |
注意： 此类的所有函数 可重入 .
| enum | Capitalization { MixedCase, AllUppercase, AllLowercase, SmallCaps, Capitalize } |
| enum | HintingPreference { PreferDefaultHinting, PreferNoHinting, PreferVerticalHinting, PreferFullHinting } |
| enum | SpacingType { PercentageSpacing, AbsoluteSpacing } |
| enum | Stretch { AnyStretch, UltraCondensed, ExtraCondensed, Condensed, ..., UltraExpanded } |
| enum | Style { StyleNormal, StyleItalic, StyleOblique } |
| enum | StyleHint { AnyStyle, SansSerif, Helvetica, Serif, ..., System } |
| enum | StyleStrategy { PreferDefault, PreferBitmap, PreferDevice, PreferOutline, ..., ForceIntegerMetrics } |
| enum | Weight { Thin, ExtraLight, Light, Normal, ..., Black } |
| QFont () | |
| QFont (const QString & family , int pointSize = -1, int weight = -1, bool italic = false) | |
| QFont (const QFont & font , QPaintDevice * pd ) | |
| QFont (const QFont & font ) | |
| ~QFont () | |
| bool | bold () const |
| Capitalization | capitalization () const |
| QString | defaultFamily () const |
| bool | exactMatch () const |
| QString | family () const |
| bool | fixedPitch () const |
| bool | fromString (const QString & descrip ) |
| HintingPreference | hintingPreference () const |
| bool | isCopyOf (const QFont & f ) const |
| bool | italic () const |
| bool | kerning () const |
| QString | key () const |
| QString | lastResortFamily () const |
| QString | lastResortFont () const |
| qreal | letterSpacing () const |
| SpacingType | letterSpacingType () const |
| bool | overline () const |
| int | pixelSize () const |
| int | pointSize () const |
| qreal | pointSizeF () const |
| QFont | resolve (const QFont & other ) const |
| void | setBold (bool enable ) |
| void | setCapitalization (Capitalization caps ) |
| void | setFamily (const QString & family ) |
| void | setFixedPitch (bool enable ) |
| void | setHintingPreference (HintingPreference hintingPreference ) |
| void | setItalic (bool enable ) |
| void | setKerning (bool enable ) |
| void | setLetterSpacing (SpacingType type , qreal spacing ) |
| void | setOverline (bool enable ) |
| void | setPixelSize (int pixelSize ) |
| void | setPointSize (int pointSize ) |
| void | setPointSizeF (qreal pointSize ) |
| void | setStretch (int factor ) |
| void | setStrikeOut (bool enable ) |
| void | setStyle (Style style ) |
| void | setStyleHint (StyleHint hint , StyleStrategy strategy = PreferDefault) |
| void | setStyleName (const QString & styleName ) |
| void | setStyleStrategy (StyleStrategy s ) |
| void | setUnderline (bool enable ) |
| void | setWeight (int weight ) |
| void | setWordSpacing (qreal spacing ) |
| int | stretch () const |
| bool | strikeOut () const |
| Style | style () const |
| StyleHint | styleHint () const |
| QString | styleName () const |
| StyleStrategy | styleStrategy () const |
| void | swap (QFont & other ) |
| QString | toString () const |
| bool | underline () const |
| int | weight () const |
| qreal | wordSpacing () const |
| operator QVariant () const | |
| bool | operator!= (const QFont & f ) const |
| bool | operator< (const QFont & f ) const |
| QFont & | operator= (const QFont & font ) |
| QFont & | operator= (QFont && other ) |
| bool | operator== (const QFont & f ) const |
| void | insertSubstitution (const QString & familyName , const QString & substituteName ) |
| void | insertSubstitutions (const QString & familyName , const QStringList & substituteNames ) |
| void | removeSubstitutions (const QString & familyName ) |
| QString | substitute (const QString & familyName ) |
| QStringList | substitutes (const QString & familyName ) |
| QStringList | substitutions () |
| uint | qHash (const QFont & font , uint seed = 0) |
| QDataStream & | operator<< (QDataStream & s , const QFont & font ) |
| QDataStream & | operator>> (QDataStream & s , QFont & font ) |
QFont class specifies a font used for drawing text.
When you create a
QFont
object you specify various attributes that you want the font to have. Qt will use the font with the specified attributes, or if no matching font exists, Qt will use the closest matching installed font. The attributes of the font that is actually used are retrievable from a
QFontInfo
对象。若窗口系统提供准确匹配
exactMatch
() 返回
true
。使用
QFontMetrics
to get measurements, e.g. the pixel length of a string using
QFontMetrics::width
().
注意， QGuiApplication instance must exist before a QFont can be used. You can set the application's default font with QGuiApplication::setFont ().
If a chosen font does not include all the characters that need to be displayed, QFont will try to find the characters in the nearest equivalent fonts. When a QPainter draws a character from a font the QFont will report whether or not it has the character; if it does not, QPainter will draw an unfilled square.
创建 QFont 像这样：
QFont serifFont("Times", 10, QFont::Bold); QFont sansFont("Helvetica [Cronyx]", 12);
The attributes set in the constructor can also be set later, e.g. setFamily (), setPointSize (), setPointSizeF (), setWeight () 和 setItalic (). The remaining attributes must be set after contstruction, e.g. setBold (), setUnderline (), setOverline (), setStrikeOut () 和 setFixedPitch (). QFontInfo objects should be created after the font's attributes have been set. A QFontInfo object will not change, even if you change the font's attributes. The corresponding "get" functions, e.g. family (), pointSize (), etc., return the values that were set, even though the values used may differ. The actual values are available from a QFontInfo 对象。
If the requested font family is unavailable you can influence the 字体匹配算法 by choosing a particular QFont::StyleHint and QFont::StyleStrategy with setStyleHint (). The default family (corresponding to the current style hint) is returned by defaultFamily ().
The font-matching algorithm has a lastResortFamily () 和 lastResortFont () in cases where a suitable match cannot be found. You can provide substitutions for font family names using insertSubstitution () 和 insertSubstitutions (). Substitutions can be removed with removeSubstitutions ()。使用 substitute () to retrieve a family's first substitute, or the family name itself if it has no substitutes. Use substitutes () to retrieve a list of a family's substitutes (which may be empty).
Every QFont has a key () which you can use, for example, as the key in a cache or dictionary. If you want to store a user's font preferences you could use QSettings , writing the font information with toString () and reading it back with fromString (). The operator<<() and operator>>() functions are also available, but they work on a data stream.
It is possible to set the height of characters shown on the screen to a specified number of pixels with setPixelSize (); however using setPointSize () has a similar effect and provides device independence.
Loading fonts can be expensive, especially on X11. QFont contains extensive optimizations to make the copying of QFont objects fast, and to cache the results of the slow window system functions it depends upon.
The font matching algorithm works as follows:
Note that the actual font matching algorithm varies from platform to platform.
In Windows a request for the "Courier" font is automatically changed to "Courier New", an improved version of Courier that allows for smooth scaling. The older "Courier" bitmap font can be selected by setting the PreferBitmap 样式战略 (见 setStyleStrategy ()).
Once a font is found, the remaining attributes are matched in order of priority:
If you have a font which matches on family, even if none of the other attributes match, this font will be chosen in preference to a font which doesn't match on family but which does match on the other attributes. This is because font family is the dominant search criteria.
The point size is defined to match if it is within 20% of the requested point size. When several fonts match and are only distinguished by point size, the font with the closest point size to the one requested will be chosen.
The actual family, font size, weight and other font attributes used for drawing text will depend on what's available for the chosen family under the window system. A QFontInfo object can be used to determine the actual values used for drawing the text.
范例：
QFont f("Helvetica");
If you had both an Adobe and a Cronyx Helvetica, you might get either.
QFont f("Helvetica [Cronyx]");
You can specify the foundry you want in the family name. The font f in the above example will be set to "Helvetica [Cronyx]".
To determine the attributes of the font actually used in the window system, use a QFontInfo 对象，如
QFontInfo info(f1); QString family = info.family();
要找出字体规格，使用 QFontMetrics 对象，如
QFontMetrics fm(f1); int textWidthInPixels = fm.width("How many pixels wide is this text?"); int textHeightInPixels = fm.height();
对于字体的更多一般信息，见 comp.fonts FAQ . Information on encodings can be found from Roman Czyborra's 页面。
另请参阅 QFontMetrics , QFontInfo , QFontDatabase ，和 字符映射范例 .
Rendering option for text this font applies to.
| 常量 | 值 | 描述 |
|---|---|---|
QFont::MixedCase
|
0
|
This is the normal text rendering option where no capitalization change is applied. |
QFont::AllUppercase
|
1
|
This alters the text to be rendered in all uppercase type. |
QFont::AllLowercase
|
2
|
This alters the text to be rendered in all lowercase type. |
QFont::SmallCaps
|
3
|
This alters the text to be rendered in small-caps type. |
QFont::Capitalize
|
4
|
This alters the text to be rendered with the first character of each word as an uppercase character. |
该枚举在 Qt 4.4 引入或被修改。
This enum describes the different levels of hinting that can be applied to glyphs to improve legibility on displays where it might be warranted by the density of pixels.
| 常量 | 值 | 描述 |
|---|---|---|
QFont::PreferDefaultHinting
|
0
|
Use the default hinting level for the target platform. |
QFont::PreferNoHinting
|
1
|
If possible, render text without hinting the outlines of the glyphs. The text layout will be typographically accurate and scalable, using the same metrics as are used e.g. when printing. |
QFont::PreferVerticalHinting
|
2
|
If possible, render text with no horizontal hinting, but align glyphs to the pixel grid in the vertical direction. The text will appear crisper on displays where the density is too low to give an accurate rendering of the glyphs. But since the horizontal metrics of the glyphs are unhinted, the text's layout will be scalable to higher density devices (such as printers) without impacting details such as line breaks. |
QFont::PreferFullHinting
|
3
|
If possible, render text with hinting in both horizontal and vertical directions. The text will be altered to optimize legibility on the target device, but since the metrics will depend on the target size of the text, the positions of glyphs, line breaks, and other typographical detail will not scale, meaning that a text layout may look different on devices with different pixel densities. |
Please note that this enum only describes a preference, as the full range of hinting levels are not supported on all of Qt's supported platforms. The following table details the effect of a given hinting preference on a selected set of target platforms.
| PreferDefaultHinting | PreferNoHinting | PreferVerticalHinting | PreferFullHinting | |
|---|---|---|---|---|
| Windows Vista (w/o 平台更新) 及更早版本 | 完整提示 | 完整提示 | 完整提示 | 完整提示 |
| Windows 7 and Windows Vista (w/Platform Update) and DirectWrite enabled in Qt | 完整提示 | 垂直提示 | 垂直提示 | 完整提示 |
| FreeType | 操作系统设置 | 不提示 | Vertical hinting (light) | 完整提示 |
| 在 macOS 的 Cocoa | 不提示 | 不提示 | 不提示 | 不提示 |
注意： Please be aware that altering the hinting preference on Windows is available through the DirectWrite font engine. This is available on Windows Vista after installing the platform update, and on Windows 7. In order to use this extension, configure Qt using -directwrite. The target application will then depend on the availability of DirectWrite on the target system.
该枚举在 Qt 4.8 引入或被修改。
| 常量 | 值 | 描述 |
|---|---|---|
QFont::PercentageSpacing
|
0
|
值 100 将保持间距不变；值 200 将字符后间距扩大到字符本身宽度。 |
QFont::AbsoluteSpacing
|
1
|
正值递增相应像素的字母间距；负值递减间距。 |
该枚举在 Qt 4.4 引入或被修改。
Predefined stretch values that follow the CSS naming convention. The higher the value, the more stretched the text is.
| 常量 | 值 | 描述 |
|---|---|---|
QFont::AnyStretch
|
0
|
0 Accept any stretch matched using the other QFont 特性 (在 Qt 5.8 添加) |
QFont::UltraCondensed
|
50
|
50 |
QFont::ExtraCondensed
|
62
|
62 |
QFont::Condensed
|
75
|
75 |
QFont::SemiCondensed
|
87
|
87 |
QFont::Unstretched
|
100
|
100 |
QFont::SemiExpanded
|
112
|
112 |
QFont::Expanded
|
125
|
125 |
QFont::ExtraExpanded
|
150
|
150 |
QFont::UltraExpanded
|
200
|
200 |
另请参阅 setStretch () 和 stretch ().
This enum describes the different styles of glyphs that are used to display text.
| 常量 | 值 | 描述 |
|---|---|---|
QFont::StyleNormal
|
0
|
Normal glyphs used in unstyled text. |
QFont::StyleItalic
|
1
|
Italic glyphs that are specifically designed for the purpose of representing italicized text. |
QFont::StyleOblique
|
2
|
Glyphs with an italic appearance that are typically based on the unstyled glyphs, but are not fine-tuned for the purpose of representing italicized text. |
另请参阅 Weight .
样式提示用于 字体匹配 algorithm to find an appropriate default family if a selected font family is not available.
| 常量 | 值 | 描述 |
|---|---|---|
QFont::AnyStyle
|
? | leaves the font matching algorithm to choose the family. This is the default. |
QFont::SansSerif
|
Helvetica
|
the font matcher prefer sans serif fonts. |
QFont::Helvetica
|
0
|
同义词
SansSerif
.
|
QFont::Serif
|
Times
|
字体匹配器首选 serif 字体。 |
QFont::Times
|
? |
同义词
Serif
.
|
QFont::TypeWriter
|
Courier
|
the font matcher prefers fixed pitch fonts. |
QFont::Courier
|
? |
同义词
TypeWriter
.
|
QFont::OldEnglish
|
? | the font matcher prefers decorative fonts. |
QFont::Decorative
|
OldEnglish
|
同义词
OldEnglish
.
|
QFont::Monospace
|
? | the font matcher prefers fonts that map to the CSS generic font-family 'monospace'. |
QFont::Fantasy
|
? | the font matcher prefers fonts that map to the CSS generic font-family 'fantasy'. |
QFont::Cursive
|
? | the font matcher prefers fonts that map to the CSS generic font-family 'cursive'. |
QFont::System
|
? | the font matcher prefers system fonts. |
样式战略告诉 字体匹配 算法应使用什么类型的字体来查找合适默认系列。
下列战略是可以的：
| 常量 | 值 | 描述 |
|---|---|---|
QFont::PreferDefault
|
0x0001
|
the default style strategy. It does not prefer any type of font. |
QFont::PreferBitmap
|
0x0002
|
prefers bitmap fonts (as opposed to outline fonts). |
QFont::PreferDevice
|
0x0004
|
prefers device fonts. |
QFont::PreferOutline
|
0x0008
|
prefers outline fonts (as opposed to bitmap fonts). |
QFont::ForceOutline
|
0x0010
|
forces the use of outline fonts. |
QFont::NoAntialias
|
0x0100
|
不对字体抗锯齿。 |
QFont::NoSubpixelAntialias
|
0x0800
|
avoid subpixel antialiasing on the fonts if possible. |
QFont::PreferAntialias
|
0x0080
|
antialias if possible. |
QFont::OpenGLCompatible
|
0x0200
|
forces the use of OpenGL compatible fonts. |
QFont::NoFontMerging
|
0x8000
|
If the font selected for a certain writing system does not contain a character requested to draw, then Qt automatically chooses a similar looking font that contains the character. The NoFontMerging flag disables this feature. Please note that enabling this flag will not prevent Qt from automatically picking a suitable font when the selected font does not support the writing system of the text. |
Any of these may be OR-ed with one of these flags:
| 常量 | 值 | 描述 |
|---|---|---|
QFont::PreferMatch
|
0x0020
|
prefer an exact match. The font matcher will try to use the exact font size that has been specified. |
QFont::PreferQuality
|
0x0040
|
prefer the best quality font. The font matcher will use the nearest standard point size that the font supports. |
QFont::ForceIntegerMetrics
|
0x0400
|
forces the use of integer values in font engines that support fractional font metrics. |
Qt uses a weighting scale from 0 to 99 similar to, but not the same as, the scales used in Windows or CSS. A weight of 0 will be thin, whilst 99 will be extremely black.
此枚举包含预定义的字体权重：
| 常量 | 值 | 描述 |
|---|---|---|
QFont::Thin
|
0
|
0 |
QFont::ExtraLight
|
12
|
12 |
QFont::Light
|
25
|
25 |
QFont::Normal
|
50
|
50 |
QFont::Medium
|
57
|
57 |
QFont::DemiBold
|
63
|
63 |
QFont::Bold
|
75
|
75 |
QFont::ExtraBold
|
81
|
81 |
QFont::Black
|
87
|
87 |
使用应用程序默认字体，构造字体对象。
另请参阅 QGuiApplication::setFont () 和 QGuiApplication::font ().
构造字体对象采用指定 family , pointSize , weight and italic 设置。
若 pointSize is zero or negative, the point size of the font is set to a system-dependent default value. Generally, this is 12 points.
family name may optionally also include a foundry name, e.g. "Helvetica [Cronyx]". If the family is available from more than one foundry and the foundry isn't specified, an arbitrary foundry is chosen. If the family isn't available a family will be set using the 字体匹配 algorithm.
另请参阅 Weight , setFamily (), setPointSize (), setWeight (), setItalic (), setStyleHint ()，和 QGuiApplication::font ().
构造字体从 font for use on the paint device pd .
构造副本字体为 font .
销毁字体对象并释放所有分配资源。
返回
true
if
weight
() 值大于
QFont::Medium
；否则返回
false
.
另请参阅 weight (), setBold ()，和 QFontInfo::bold ().
Returns the current capitalization type of the font.
该函数在 Qt 4.4 引入。
另请参阅 setCapitalization ().
Returns the family name that corresponds to the current style hint.
另请参阅 StyleHint , styleHint ()，和 setStyleHint ().
返回
true
if a window system font exactly matching the settings of this font is available.
另请参阅 QFontInfo .
Returns the requested font family name, i.e. the name set in the constructor or the last setFont() call.
另请参阅 setFamily (), substitutes ()，和 substitute ().
返回
true
若有设置固定间距；否则返回
false
.
另请参阅 setFixedPitch () 和 QFontInfo::fixedPitch ().
设置此字体以匹配描述 descrip . The description is a comma-separated list of the font attributes, as returned by toString ().
另请参阅 toString ().
Returns the currently preferred hinting level for glyphs rendered with this font.
该函数在 Qt 4.8 引入。
另请参阅 setHintingPreference ().
[static]
void
QFont::
insertSubstitution
(const
QString
&
familyName
, const
QString
&
substituteName
)
插入 substituteName into the substitution table for the family familyName .
另请参阅 insertSubstitutions (), removeSubstitutions (), substitutions (), substitute ()，和 substitutes ().
[static]
void
QFont::
insertSubstitutions
(const
QString
&
familyName
, const
QStringList
&
substituteNames
)
Inserts the list of families substituteNames into the substitution list for familyName .
另请参阅 insertSubstitution (), removeSubstitutions (), substitutions ()，和 substitute ().
返回
true
if this font and
f
are copies of each other, i.e. one of them was created as a copy of the other and neither has been modified since. This is much stricter than equality.
另请参阅 operator= () 和 operator== ().
返回
true
若
style
() of the font is not
QFont::StyleNormal
返回
true
if kerning should be used when drawing text with this font.
另请参阅 setKerning ().
Returns the font's key, a textual representation of a font. It is typically used as the key for a cache or dictionary of fonts.
另请参阅 QMap .
Returns the "last resort" font family name.
The current implementation tries a wide variety of common fonts, returning the first one it finds. Is is possible that no family is found in which case an empty string is returned.
另请参阅 lastResortFont ().
Returns a "last resort" font name for the font matching algorithm. This is used if the last resort family is not available. It will always return a name, if necessary returning something like "fixed" or "system".
The current implementation tries a wide variety of common fonts, returning the first one it finds. The implementation may change at any time, but this function will always return a string containing something.
It is theoretically possible that there really isn't a lastResortFont() in which case Qt will abort with an error message. We have not been able to identify a case where this happens. Please report it as a bug if it does, preferably with a list of the fonts you have installed.
另请参阅 lastResortFamily ().
返回字体的字母间距。
该函数在 Qt 4.4 引入。
另请参阅 setLetterSpacing (), letterSpacingType ()，和 setWordSpacing ().
返回用于字母间距的间距类型。
该函数在 Qt 4.4 引入。
另请参阅 letterSpacing (), setLetterSpacing ()，和 setWordSpacing ().
返回
true
若有设置上划线；否则返回
false
.
另请参阅 setOverline ().
返回字体的像素大小，若它有设置采用 setPixelSize ()。返回 -1 若大小的设置是采用 setPointSize () 或 setPointSizeF ().
另请参阅 setPixelSize (), pointSize (), QFontInfo::pointSize ()，和 QFontInfo::pixelSize ().
返回字体的点大小。返回 -1 若以像素为单位指定字体大小。
另请参阅 setPointSize () 和 pointSizeF ().
返回字体的点大小。返回 -1 若以像素为单位指定字体大小。
另请参阅 pointSize (), setPointSizeF (), pixelSize (), QFontInfo::pointSize ()，和 QFontInfo::pixelSize ().
[static]
void
QFont::
removeSubstitutions
(const
QString
&
familyName
)
移除所有代入为 familyName .
该函数在 Qt 5.0 引入。
另请参阅 insertSubstitutions (), insertSubstitution (), substitutions ()，和 substitute ().
返回新的 QFont that has attributes copied from other that have not been previously set on this font.
若 enable 为 true，将字体的权重设为 QFont::Bold ；否则将权重设为 QFont::Normal .
对于更精细粗体控制，使用 setWeight ().
注意： 若 styleName () 有设置，此值可能被忽略，或者若平台支持，字体被人为加粗。
将此字体中文本的首字母大小写设为 caps .
A font's capitalization makes the text appear in the selected capitalization mode.
该函数在 Qt 4.4 引入。
另请参阅 capitalization ().
设置字体的系列名称。名称不区分大小写且可能包括出厂名称。
family name may optionally also include a foundry name, e.g. "Helvetica [Cronyx]". If the family is available from more than one foundry and the foundry isn't specified, an arbitrary foundry is chosen. If the family isn't available a family will be set using the 字体匹配 algorithm.
另请参阅 family (), setStyleHint ()，和 QFontInfo .
若 enable 为 true，设置固定间距开；否则设置固定间距关。
另请参阅 fixedPitch () 和 QFontInfo .
将字形提示级别首选设为 hintingPreference . This is a hint to the underlying font rendering system to use a certain level of hinting, and has varying support across platforms. See the table in the documentation for QFont::HintingPreference 了解更多细节。
默认提示首选 QFont::PreferDefaultHinting .
该函数在 Qt 4.8 引入。
另请参阅 hintingPreference ().
设置 style () 为字体到 QFont::StyleItalic if enable 为 true；否则样式被设为 QFont::StyleNormal .
注意： 若 styleName () 有设置，此值可能被忽略，或若平台支持，字体可能倾斜渲染，而不是拾取设计的斜体字体变体。
为此字体启用字距调整，若 enable 为 true；否则禁用它。默认情况下，字距调整是启用的。
When kerning is enabled, glyph metrics do not add up anymore, even for Latin text. In other words, the assumption that width('a') + width('b') is equal to width("ab") is not necessarily true.
另请参阅 kerning () 和 QFontMetrics .
Sets the letter spacing for the font to spacing and the type of spacing to type .
Letter spacing changes the default spacing between individual letters in the font. The spacing between the letters can be made smaller as well as larger either in percentage of the character width or in pixels, depending on the selected spacing type.
该函数在 Qt 4.4 引入。
另请参阅 letterSpacing (), letterSpacingType ()，和 setWordSpacing ().
若 enable is true, sets overline on; otherwise sets overline off.
另请参阅 overline () 和 QFontInfo .
将字体大小设为 pixelSize 像素。
使用此函数使字体设备从属。使用 setPointSize () 或 setPointSizeF () 以设备独立方式设置字体大小。
另请参阅 pixelSize ().
将点大小设为 pointSize 。点大小必须大于 0。
另请参阅 pointSize () 和 setPointSizeF ().
将点大小设为 pointSize 。点大小必须大于 0。请求精度不可能在所有平台中达成。
另请参阅 pointSizeF (), setPointSize ()，和 setPixelSize ().
Sets the stretch factor for the font.
The stretch factor matches a condensed or expanded version of the font or applies a stretch transform that changes the width of all characters in the font by
factor
percent. For example, setting
factor
to 150 results in all characters in the font being 1.5 times (ie. 150%) wider. The minimum stretch factor is 1, and the maximum stretch factor is 4000. The default stretch factor is
AnyStretch
, which will accept any stretch factor and not apply any transform on the font.
The stretch factor is only applied to outline fonts. The stretch factor is ignored for bitmap fonts.
注意： When matching a font with a native non-default stretch factor, requesting a stretch of 100 will stretch it back to a medium width font.
另请参阅 stretch () 和 QFont::Stretch .
若 enable is true, sets strikeout on; otherwise sets strikeout off.
另请参阅 strikeOut () 和 QFontInfo .
将字体样式设为 style .
另请参阅 style (), italic ()，和 QFontInfo .
将样式提示和战略设为 hint and strategy ，分别。
If these aren't set explicitly the style hint will default to
AnyStyle
and the style strategy to
PreferDefault
.
Qt does not support style hints on X11 since this information is not provided by the window system.
另请参阅 StyleHint , styleHint (), StyleStrategy , styleStrategy ()，和 QFontInfo .
Sets the style name of the font to styleName . When set, other style properties like style () 和 weight () will be ignored for font matching, though they may be simulated afterwards if supported by the platform's font engine.
Due to the lower quality of artificially simulated styles, and the lack of full cross platform support, it is not recommended to use matching by style name together with matching by style properties
该函数在 Qt 4.8 引入。
另请参阅 styleName ().
Sets the style strategy for the font to s .
另请参阅 styleStrategy () 和 QFont::StyleStrategy .
若 enable 为 true，设置下划线开；否则设置下划线关。
另请参阅 underline () 和 QFontInfo .
将字体的权重设为 weight , 使用的比例缩放定义通过 QFont::Weight 枚举。
注意： 若 styleName () 有设置，此值可能被忽略对于选中字体。
将字体单词间距设为 spacing .
Word spacing changes the default spacing between individual words. A positive value increases the word spacing by a corresponding amount of pixels, while a negative value decreases the inter-word spacing accordingly.
Word spacing will not apply to writing systems, where indiviaul words are not separated by white space.
该函数在 Qt 4.4 引入。
另请参阅 wordSpacing () 和 setLetterSpacing ().
返回字体的拉伸因子。
另请参阅 setStretch ().
返回
true
如果有设置删除线；否则返回
false
.
另请参阅 setStrikeOut ().
返回字体的样式。
另请参阅 setStyle ().
返回 StyleHint .
The style hint affects the font matching algorithm. See QFont::StyleHint 了解可用提示列表。
另请参阅 setStyleHint (), QFont::StyleStrategy ，和 QFontInfo::styleHint ().
Returns the requested font style name. This can be used to match the font with irregular styles (that can't be normalized in other style properties).
该函数在 Qt 4.8 引入。
另请参阅 setStyleName (), setFamily ()，和 setStyle ().
返回 StyleStrategy .
样式战略影响 字体匹配 算法。见 QFont::StyleStrategy 了解可用战略列表。
另请参阅 setStyleStrategy (), setStyleHint ()，和 QFont::StyleHint .
[static]
QString
QFont::
substitute
(const
QString
&
familyName
)
Returns the first family name to be used whenever familyName is specified. The lookup is case insensitive.
若没有代入对于 familyName , familyName 被返回。
要获得代入列表使用 substitutes ().
另请参阅 setFamily (), insertSubstitutions (), insertSubstitution ()，和 removeSubstitutions ().
[static]
QStringList
QFont::
substitutes
(const
QString
&
familyName
)
Returns a list of family names to be used whenever familyName is specified. The lookup is case insensitive.
若没有代入对于 familyName ，返回空列表。
另请参阅 substitute (), insertSubstitutions (), insertSubstitution ()，和 removeSubstitutions ().
[static]
QStringList
QFont::
substitutions
()
返回代入系列名称的排序列表。
另请参阅 insertSubstitution (), removeSubstitution ()，和 substitute ().
交换此字体实例与 other 。此函数非常快，且从不失败。
该函数在 Qt 5.0 引入。
Returns a description of the font. The description is a comma-separated list of the attributes, perfectly suited for use in QSettings .
另请参阅 fromString ().
返回
true
若有设置下划线；否则返回
false
.
另请参阅 setUnderline ().
返回字体的权重，使用相同比例如 QFont::Weight 枚举。
另请参阅 setWeight (), Weight ，和 QFontInfo .
返回字体的单词间距。
该函数在 Qt 4.4 引入。
另请参阅 setWordSpacing () 和 setLetterSpacing ().
返回字体作为 QVariant
返回
true
若此字体异于
f
；否则返回
false
.
两 QFont 被认为不同，若它们的字体属性不同。
另请参阅 operator== ().
提供任意比较为此字体和字体
f
。唯一保证的是运算符返回
false
若两字体相等且 (f1 < f2) == !(f2 < f1) 若字体不相等。
此函数在某些情况下很有用，例如，若想要使用 QFont 对象作为键在 QMap .
另请参阅 operator== (), operator!= ()，和 isCopyOf ().
赋值 font 到此字体并返回它的引用。
移动赋值 other 到此 QFont 实例。
该函数在 Qt 5.2 引入。
返回
true
若此字体等于
f
；否则返回 false。
两 QFont 被认为相等，若它们的字体属性相等。
另请参阅 operator!= () 和 isCopyOf ().
返回哈希值为 font 。若指定， seed 用于初始化哈希。
该函数在 Qt 5.3 引入。
写入字体 font 到数据流 s . (toString() writes to a text stream.)
另请参阅 QDataStream 运算符格式 .
读取字体 font 从数据流 s . (fromString() reads from a text stream.)
另请参阅 QDataStream 运算符格式 .