QFont Class

The QFont class specifies a query for a font used for drawing text. More...

Header:	#include <QFont>
CMake:	find_package(Qt6 COMPONENTS Gui REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::Gui)
qmake:	QT += gui

• List of all members, including inherited members
• Deprecated members

Note: All functions in this class are reentrant.

Public Types

enum	Capitalization { MixedCase, AllUppercase, AllLowercase, SmallCaps, Capitalize }
enum	HintingPreference { PreferDefaultHinting, PreferNoHinting, PreferVerticalHinting, PreferFullHinting }
enum	SpacingType { PercentageSpacing, AbsoluteSpacing }
enum	Stretch { AnyStretch, UltraCondensed, ExtraCondensed, Condensed, SemiCondensed, …, UltraExpanded }
enum	Style { StyleNormal, StyleItalic, StyleOblique }
enum	StyleHint { AnyStyle, SansSerif, Helvetica, Serif, Times, …, System }
enum	StyleStrategy { PreferDefault, PreferBitmap, PreferDevice, PreferOutline, ForceOutline, …, PreferQuality }
enum	Weight { Thin, ExtraLight, Light, Normal, Medium, …, Black }

Public Functions

	QFont(const QFont &font)
	QFont(const QFont &font, const QPaintDevice *pd)
	QFont(const QStringList &families, int pointSize = -1, int weight = -1, bool italic = false)
	QFont(const QString &family, int pointSize = -1, int weight = -1, bool italic = false)
	QFont()
QFont &	operator=(QFont &&other)
QFont &	operator=(const QFont &font)
	~QFont()
bool	bold() const
QFont::Capitalization	capitalization() const
QString	defaultFamily() const
bool	exactMatch() const
QStringList	families() const
QString	family() const
bool	fixedPitch() const
bool	fromString(const QString &descrip)
QFont::HintingPreference	hintingPreference() const
bool	isCopyOf(const QFont &f) const
bool	italic() const
bool	kerning() const
QString	key() const
qreal	letterSpacing() const
QFont::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(QFont::Capitalization caps)
void	setFamilies(const QStringList &families)
void	setFamily(const QString &family)
void	setFixedPitch(bool enable)
void	setHintingPreference(QFont::HintingPreference hintingPreference)
void	setItalic(bool enable)
void	setKerning(bool enable)
void	setLetterSpacing(QFont::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(QFont::Style style)
void	setStyleHint(QFont::StyleHint hint, QFont::StyleStrategy strategy = PreferDefault)
void	setStyleName(const QString &styleName)
void	setStyleStrategy(QFont::StyleStrategy s)
void	setUnderline(bool enable)
void	setWeight(QFont::Weight weight)
void	setWordSpacing(qreal spacing)
int	stretch() const
bool	strikeOut() const
QFont::Style	style() const
QFont::StyleHint	styleHint() const
QString	styleName() const
QFont::StyleStrategy	styleStrategy() const
void	swap(QFont &other)
QString	toString() const
bool	underline() const
QFont::Weight	weight() const
qreal	wordSpacing() const
QVariant	operator QVariant() const
bool	operator!=(const QFont &f) const
bool	operator<(const QFont &f) const
bool	operator==(const QFont &f) const

Static Public Members

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()

Related Non-Members

size_t	qHash(const QFont &font, size_t seed = 0)
QDataStream &	operator<<(QDataStream &s, const QFont &font)
QDataStream &	operator>>(QDataStream &s, QFont &font)

Detailed Description

QFont can be regarded as a query for one or more fonts on the system.

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 object. If the window system provides an exact match exactMatch() returns true. Use QFontMetricsF to get measurements, e.g. the pixel length of a string using QFontMetrics::width().

Attributes which are not specifically set will not affect the font selection algorithm, and default values will be preferred instead.

To load a specific physical font, typically represented by a single file, use QRawFont instead.

Note that a 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.

Create QFonts like this:

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() and setItalic(). The remaining attributes must be set after construction, e.g. setBold(), setUnderline(), setOverline(), setStrikeOut() and 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 object.

If the requested font family is unavailable you can influence the font matching algorithm by choosing a particular QFont::StyleHint and QFont::StyleStrategy with setStyleHint(). The default family (corresponding to the current style hint) is returned by defaultFamily().

You can provide substitutions for font family names using insertSubstitution() and insertSubstitutions(). Substitutions can be removed with removeSubstitutions(). Use 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). After substituting a font, you must trigger the updating of the font by destroying and re-creating all QFont objects.

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:

1. The specified font families (set by setFamilies()) are searched for.
2. If not found, then if set the specified font family exists and can be used to represent the writing system in use, it will be selected.
3. If not, a replacement font that supports the writing system is selected. The font matching algorithm will try to find the best match for all the properties set in the QFont. How this is done varies from platform to platform.
4. If no font exists on the system that can support the text, then special "missing character" boxes will be shown in its place.

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 style strategy (see setStyleStrategy()).

Once a font is found, the remaining attributes are matched in order of priority:

1. fixedPitch()
2. pointSize() (see below)
3. weight()
4. style()

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.

Examples:

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 object, e.g.

QFontInfo info(f1);
QString family = info.family();

To find out font metrics use a QFontMetrics object, e.g.

QFontMetrics fm(f1);
int textWidthInPixels = fm.horizontalAdvance("How many pixels wide is this text?");
int textHeightInPixels = fm.height();

For more general information on fonts, see the comp.fonts FAQ. Information on encodings can be found from the UTR17 page.

See also QFontMetrics, QFontInfo, QFontDatabase, and Character Map Example.

Member Type Documentation

enum QFont::Capitalization

Rendering option for text this font applies to.

Constant	Value	Description
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.

enum QFont::HintingPreference

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.

Constant	Value	Description
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 Platform Update) and earlier	Full hinting	Full hinting	Full hinting	Full hinting
Windows 7 and Windows Vista (w/Platform Update) and DirectWrite enabled in Qt	Full hinting	Vertical hinting	Vertical hinting	Full hinting
FreeType	Operating System setting	No hinting	Vertical hinting (light)	Full hinting
Cocoa on macOS	No hinting	No hinting	No hinting	No hinting

enum QFont::SpacingType

Constant	Value	Description
QFont::PercentageSpacing	0	A value of 100 will keep the spacing unchanged; a value of 200 will enlarge the spacing after a character by the width of the character itself.
QFont::AbsoluteSpacing	1	A positive value increases the letter spacing by the corresponding pixels; a negative value decreases the spacing.

enum QFont::Stretch

Predefined stretch values that follow the CSS naming convention. The higher the value, the more stretched the text is.

Constant	Value	Description
QFont::AnyStretch	0	0 Accept any stretch matched using the other QFont properties (added in Qt 5.8)
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

See also setStretch() and stretch().

enum QFont::Style

This enum describes the different styles of glyphs that are used to display text.

Constant	Value	Description
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.

See also Weight.

enum QFont::StyleHint

Style hints are used by the font matching algorithm to find an appropriate default family if a selected font family is not available.

Constant	Value	Description
QFont::AnyStyle	5	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	is a synonym for SansSerif.
QFont::Serif	Times	the font matcher prefers serif fonts.
QFont::Times	1	is a synonym for Serif.
QFont::TypeWriter	Courier	the font matcher prefers fixed pitch fonts.
QFont::Courier	2	a synonym for TypeWriter.
QFont::OldEnglish	3	the font matcher prefers decorative fonts.
QFont::Decorative	OldEnglish	is a synonym for OldEnglish.
QFont::Monospace	7	the font matcher prefers fonts that map to the CSS generic font-family 'monospace'.
QFont::Fantasy	8	the font matcher prefers fonts that map to the CSS generic font-family 'fantasy'.
QFont::Cursive	6	the font matcher prefers fonts that map to the CSS generic font-family 'cursive'.
QFont::System	4	the font matcher prefers system fonts.

enum QFont::StyleStrategy

The style strategy tells the font matching algorithm what type of fonts should be used to find an appropriate default family.

The following strategies are available:

Constant	Value	Description
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	don't antialias the fonts.
QFont::NoSubpixelAntialias	0x0800	avoid subpixel antialiasing on the fonts if possible.
QFont::PreferAntialias	0x0080	antialias if possible.
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.
QFont::PreferNoShaping	0x1000	Sometimes, a font will apply complex rules to a set of characters in order to display them correctly. In some writing systems, such as Brahmic scripts, this is required in order for the text to be legible, but in e.g. Latin script, it is merely a cosmetic feature. The PreferNoShaping flag will disable all such features when they are not required, which will improve performance in most cases (since Qt 5.10).

Any of these may be OR-ed with one of these flags:

Constant	Value	Description
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.

enum QFont::Weight

Qt uses a weighting scale from 1 to 1000 compatible with OpenType. A weight of 1 will be thin, whilst 1000 will be extremely black.

This enum contains the predefined font weights:

Constant	Value	Description
QFont::Thin	100	100
QFont::ExtraLight	200	200
QFont::Light	300	300
QFont::Normal	400	400
QFont::Medium	500	500
QFont::DemiBold	600	600
QFont::Bold	700	700
QFont::ExtraBold	800	800
QFont::Black	900	900

Member Function Documentation

QFont::QFont(const QFont &font)

Constructs a font that is a copy of font.

[since 5.13] QFont::QFont(const QFont &font, const QPaintDevice *pd)

Constructs a font from font for use on the paint device pd.

This function was introduced in Qt 5.13.

QFont::QFont(const QStringList &families, int pointSize = -1, int weight = -1, bool italic = false)

Constructs a font object with the specified families, pointSize, weight and italic settings.

If pointSize is zero or negative, the point size of the font is set to a system-dependent default value. Generally, this is 12 points.

Each family name entry in families 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 font matching algorithm.

See also Weight, setPointSize(), setWeight(), setItalic(), setStyleHint(), setFamilies(), and QGuiApplication::font().

QFont::QFont(const QString &family, int pointSize = -1, int weight = -1, bool italic = false)

Constructs a font object with the specified family, pointSize, weight and italic settings.

If pointSize is zero or negative, the point size of the font is set to a system-dependent default value. Generally, this is 12 points.

The 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 font matching algorithm.

This will split the family string on a comma and call setFamilies() with the resulting list. To preserve a font that uses a comma in its name, use the constructor that takes a QStringList.

See also Weight, setFamily(), setPointSize(), setWeight(), setItalic(), setStyleHint(), setFamilies(), and QGuiApplication::font().

QFont::QFont()

Constructs a font object that uses the application's default font.

See also QGuiApplication::setFont() and QGuiApplication::font().

[since 5.2] QFont &QFont::operator=(QFont &&other)

Move-assigns other to this QFont instance.

This function was introduced in Qt 5.2.

QFont &QFont::operator=(const QFont &font)

Assigns font to this font and returns a reference to it.

QFont::~QFont()

Destroys the font object and frees all allocated resources.

bool QFont::bold() const

Returns true if weight() is a value greater than QFont::Medium; otherwise returns false.

See also weight(), setBold(), and QFontInfo::bold().

QFont::Capitalization QFont::capitalization() const

Returns the current capitalization type of the font.

See also setCapitalization().

QString QFont::defaultFamily() const

Returns the family name that corresponds to the current style hint.

See also StyleHint, styleHint(), and setStyleHint().

bool QFont::exactMatch() const

Returns true if a window system font exactly matching the settings of this font is available.

See also QFontInfo.

[since 5.13] QStringList QFont::families() const

Returns the requested font family names, i.e. the names set in the last setFamilies() call or via the constructor. Otherwise it returns an empty list.

This function was introduced in Qt 5.13.

See also setFamily(), setFamilies(), family(), substitutes(), and substitute().

QString QFont::family() const

Returns the requested font family name. This will always be the same as the first entry in the families() call.

See also setFamily(), substitutes(), substitute(), setFamilies(), and families().

bool QFont::fixedPitch() const

Returns true if fixed pitch has been set; otherwise returns false.

See also setFixedPitch() and QFontInfo::fixedPitch().

bool QFont::fromString(const QString &descrip)

Sets this font to match the description descrip. The description is a comma-separated list of the font attributes, as returned by toString().

See also toString().

QFont::HintingPreference QFont::hintingPreference() const

Returns the currently preferred hinting level for glyphs rendered with this font.

See also setHintingPreference().

[static] void QFont::insertSubstitution(const QString &familyName, const QString &substituteName)

Inserts substituteName into the substitution table for the family familyName.

After substituting a font, trigger the updating of the font by destroying and re-creating all QFont objects.

See also insertSubstitutions(), removeSubstitutions(), substitutions(), substitute(), and substitutes().

[static] void QFont::insertSubstitutions(const QString &familyName, const QStringList &substituteNames)

Inserts the list of families substituteNames into the substitution list for familyName.

After substituting a font, trigger the updating of the font by destroying and re-creating all QFont objects.

See also insertSubstitution(), removeSubstitutions(), substitutions(), and substitute().

bool QFont::isCopyOf(const QFont &f) const

Returns 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.

See also operator=() and operator==().

bool QFont::italic() const

Returns true if the style() of the font is not QFont::StyleNormal

See also setItalic() and style().

bool QFont::kerning() const

Returns true if kerning should be used when drawing text with this font.

See also setKerning().

QString QFont::key() const

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.

See also QMap.

qreal QFont::letterSpacing() const

Returns the letter spacing for the font.

See also setLetterSpacing(), letterSpacingType(), and setWordSpacing().

QFont::SpacingType QFont::letterSpacingType() const

Returns the spacing type used for letter spacing.

See also letterSpacing(), setLetterSpacing(), and setWordSpacing().

bool QFont::overline() const

Returns true if overline has been set; otherwise returns false.

See also setOverline().

int QFont::pixelSize() const

Returns the pixel size of the font if it was set with setPixelSize(). Returns -1 if the size was set with setPointSize() or setPointSizeF().

See also setPixelSize(), pointSize(), QFontInfo::pointSize(), and QFontInfo::pixelSize().

int QFont::pointSize() const

Returns the point size of the font. Returns -1 if the font size was specified in pixels.

See also setPointSize() and pointSizeF().

qreal QFont::pointSizeF() const

Returns the point size of the font. Returns -1 if the font size was specified in pixels.

See also pointSize(), setPointSizeF(), pixelSize(), QFontInfo::pointSize(), and QFontInfo::pixelSize().

[static, since 5.0] void QFont::removeSubstitutions(const QString &familyName)

Removes all the substitutions for familyName.

This function was introduced in Qt 5.0.

See also insertSubstitutions(), insertSubstitution(), substitutions(), and substitute().

QFont QFont::resolve(const QFont &other) const

Returns a new QFont that has attributes copied from other that have not been previously set on this font.

void QFont::setBold(bool enable)

If enable is true sets the font's weight to QFont::Bold; otherwise sets the weight to QFont::Normal.

For finer boldness control use setWeight().

See also bold() and setWeight().

void QFont::setCapitalization(QFont::Capitalization caps)

Sets the capitalization of the text in this font to caps.

A font's capitalization makes the text appear in the selected capitalization mode.

See also capitalization().

[since 5.13] void QFont::setFamilies(const QStringList &families)

Sets the list of family names for the font. The names are case insensitive and may include a foundry name. The first family in families will be set as the main family for the font.

Each family name entry in families 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 font matching algorithm.

This function was introduced in Qt 5.13.

See also family(), families(), setFamily(), setStyleHint(), and QFontInfo.

void QFont::setFamily(const QString &family)

Sets the family name of the font. The name is case insensitive and may include a foundry name.

The 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 font matching algorithm.

This will split the family string on a comma and call setFamilies() with the resulting list. To preserve a font that uses a comma in it's name then use setFamilies() directly. From Qt 6.2 this behavior will no longer happen and family will be passed as a single family.

See also family(), setStyleHint(), setFamilies(), families(), and QFontInfo.

void QFont::setFixedPitch(bool enable)

If enable is true, sets fixed pitch on; otherwise sets fixed pitch off.

See also fixedPitch() and QFontInfo.

void QFont::setHintingPreference(QFont::HintingPreference hintingPreference)

Set the preference for the hinting level of the glyphs to 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 for more details.

The default hinting preference is QFont::PreferDefaultHinting.

See also hintingPreference().

void QFont::setItalic(bool enable)

Sets the style() of the font to QFont::StyleItalic if enable is true; otherwise the style is set to QFont::StyleNormal.

See also italic() and QFontInfo.

void QFont::setKerning(bool enable)

Enables kerning for this font if enable is true; otherwise disables it. By default, kerning is enabled.

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.

See also kerning() and QFontMetrics.

void QFont::setLetterSpacing(QFont::SpacingType type, qreal spacing)

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.

See also letterSpacing(), letterSpacingType(), and setWordSpacing().

void QFont::setOverline(bool enable)

If enable is true, sets overline on; otherwise sets overline off.

See also overline() and QFontInfo.

void QFont::setPixelSize(int pixelSize)

Sets the font size to pixelSize pixels.

Using this function makes the font device dependent. Use setPointSize() or setPointSizeF() to set the size of the font in a device independent manner.

See also pixelSize().

void QFont::setPointSize(int pointSize)

Sets the point size to pointSize. The point size must be greater than zero.

See also pointSize() and setPointSizeF().

void QFont::setPointSizeF(qreal pointSize)

Sets the point size to pointSize. The point size must be greater than zero. The requested precision may not be achieved on all platforms.

See also pointSizeF(), setPointSize(), and setPixelSize().

void QFont::setStretch(int factor)

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.

See also stretch() and QFont::Stretch.

void QFont::setStrikeOut(bool enable)

If enable is true, sets strikeout on; otherwise sets strikeout off.

See also strikeOut() and QFontInfo.

void QFont::setStyle(QFont::Style style)

Sets the style of the font to style.

See also style(), italic(), and QFontInfo.

void QFont::setStyleHint(QFont::StyleHint hint, QFont::StyleStrategy strategy = PreferDefault)

Sets the style hint and strategy to hint and strategy, respectively.

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.

See also StyleHint, styleHint(), StyleStrategy, styleStrategy(), and QFontInfo.

void QFont::setStyleName(const QString &styleName)

Sets the style name of the font to styleName. When set, other style properties like style() and 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

See also styleName().

void QFont::setStyleStrategy(QFont::StyleStrategy s)

Sets the style strategy for the font to s.

See also styleStrategy() and QFont::StyleStrategy.

void QFont::setUnderline(bool enable)

If enable is true, sets underline on; otherwise sets underline off.

See also underline() and QFontInfo.

void QFont::setWeight(QFont::Weight weight)

Sets the weight of the font to weight, using the scale defined by QFont::Weight enumeration.

See also weight() and QFontInfo.

void QFont::setWordSpacing(qreal spacing)

Sets the word spacing for the font to 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.

See also wordSpacing() and setLetterSpacing().

int QFont::stretch() const

Returns the stretch factor for the font.

See also setStretch().

bool QFont::strikeOut() const

Returns true if strikeout has been set; otherwise returns false.

See also setStrikeOut().

QFont::Style QFont::style() const

Returns the style of the font.

See also setStyle().

QFont::StyleHint QFont::styleHint() const

Returns the StyleHint.

The style hint affects the font matching algorithm. See QFont::StyleHint for the list of available hints.

See also setStyleHint(), QFont::StyleStrategy, and QFontInfo::styleHint().

QString QFont::styleName() const

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).

See also setStyleName(), setFamily(), and setStyle().

QFont::StyleStrategy QFont::styleStrategy() const

Returns the StyleStrategy.

The style strategy affects the font matching algorithm. See QFont::StyleStrategy for the list of available strategies.

See also setStyleStrategy(), setStyleHint(), and 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.

If there is no substitution for familyName, familyName is returned.

To obtain a list of substitutions use substitutes().

See also setFamily(), insertSubstitutions(), insertSubstitution(), and 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.

If there is no substitution for familyName, an empty list is returned.

See also substitute(), insertSubstitutions(), insertSubstitution(), and removeSubstitutions().

[static] QStringList QFont::substitutions()

Returns a sorted list of substituted family names.

See also insertSubstitution(), removeSubstitutions(), and substitute().

[since 5.0] void QFont::swap(QFont &other)

Swaps this font instance with other. This function is very fast and never fails.

This function was introduced in Qt 5.0.

QString QFont::toString() const

Returns a description of the font. The description is a comma-separated list of the attributes, perfectly suited for use in QSettings, and consists of the following:

• Font family
• Point size
• Pixel size
• Style hint
• Font weight
• Font style
• Underline
• Strike out
• Fixed pitch
• Always 0
• Capitalization
• Letter spacing
• Word spacing
• Stretch
• Style strategy
• Font style (omitted when unavailable)

See also fromString().

bool QFont::underline() const

Returns true if underline has been set; otherwise returns false.

See also setUnderline().

QFont::Weight QFont::weight() const

Returns the weight of the font, using the same scale as the QFont::Weight enumeration.

See also setWeight(), Weight, and QFontInfo.

qreal QFont::wordSpacing() const

Returns the word spacing for the font.

See also setWordSpacing() and setLetterSpacing().

QVariant QFont::operator QVariant() const

Returns the font as a QVariant

bool QFont::operator!=(const QFont &f) const

Returns true if this font is different from f; otherwise returns false.

Two QFonts are considered to be different if their font attributes are different.

See also operator==().

bool QFont::operator<(const QFont &f) const

Provides an arbitrary comparison of this font and font f. All that is guaranteed is that the operator returns false if both fonts are equal and that (f1 < f2) == !(f2 < f1) if the fonts are not equal.

This function is useful in some circumstances, for example if you want to use QFont objects as keys in a QMap.

See also operator==(), operator!=(), and isCopyOf().

bool QFont::operator==(const QFont &f) const

Returns true if this font is equal to f; otherwise returns false.

Two QFonts are considered equal if their font attributes are equal.

See also operator!=() and isCopyOf().