QFont(3qt)

📦 version 3.3.8b, in fedora 43, fedora 44

QFont 💖✨

okay bestie, this is the manual page for QFont from the Qt toolkit (that's QFont(3qt), if you're keeping track). It's the class that handles fonts used for drawing text. Buckle up, there's a LOT here, and it's all important, so grab a boba 🧋

NAME 🎀

QFont — the font used for drawing text. that's the whole vibe. it's the thing that decides what your letters look like. iconic behavior honestly 💅

SYNOPSIS ✨

#include <qfont.h>

Public Members 🫶

enum StyleHint { Helvetica, SansSerif = Helvetica, Times, Serif = Times,
    Courier, TypeWriter = Courier, OldEnglish, Decorative = OldEnglish,
    System, AnyStyle }
enum StyleStrategy { PreferDefault = 0x0001, PreferBitmap = 0x0002,
    PreferDevice = 0x0004, PreferOutline = 0x0008, ForceOutline =
    0x0010, PreferMatch = 0x0020, PreferQuality = 0x0040,
    PreferAntialias = 0x0080, NoAntialias = 0x0100, OpenGLCompatible =
    0x0200 }
enum Weight { Light = 25, Normal = 50, DemiBold = 63, Bold = 75, Black =
    87 }
enum Stretch { UltraCondensed = 50, ExtraCondensed = 62, Condensed = 75,
    SemiCondensed = 87, Unstretched = 100, SemiExpanded = 112, Expanded
    = 125, ExtraExpanded = 150, UltraExpanded = 200 }
QFont ()
QFont ( const QString & family, int pointSize = 12, int weight = Normal,
    bool italic = FALSE )
QFont ( const QFont & font )
~QFont ()
QString family () const
void setFamily ( const QString & family )
int pointSize () const
float pointSizeFloat () const
void setPointSize ( int pointSize )
void setPointSizeFloat ( float pointSize )
int pixelSize () const
void setPixelSize ( int pixelSize )
void setPixelSizeFloat ( float pixelSize )  (obsolete)
int weight () const
void setWeight ( int weight )
bool bold () const
void setBold ( bool enable )
bool italic () const
void setItalic ( bool enable )
bool underline () const
void setUnderline ( bool enable )
bool overline () const
void setOverline ( bool enable )
bool strikeOut () const
void setStrikeOut ( bool enable )
bool fixedPitch () const
void setFixedPitch ( bool enable )
StyleHint styleHint () const
StyleStrategy styleStrategy () const
void setStyleHint ( StyleHint hint, StyleStrategy strategy =
    PreferDefault )
void setStyleStrategy ( StyleStrategy s )
int stretch () const
void setStretch ( int factor )
bool rawMode () const
void setRawMode ( bool enable )
bool exactMatch () const
QFont & operator= ( const QFont & font )
bool operator== ( const QFont & f ) const
bool operator!= ( const QFont & f ) const
bool isCopyOf ( const QFont & f ) const
HFONT handle () const
void setRawName ( const QString & name )
QString rawName () const
QString key () const
QString toString () const
bool fromString ( const QString & descrip )
void qwsRenderToDisk ( bool all = TRUE )
enum Script { Latin, Greek, Cyrillic, Armenian, Georgian, Runic, Ogham,
    SpacingModifiers, CombiningMarks, Hebrew, Arabic, Syriac, Thaana,
    Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu,
    Kannada, Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar, Khmer,
    Han, Hiragana, Katakana, Hangul, Bopomofo, Yi, Ethiopic, Cherokee,
    CanadianAboriginal, Mongolian, CurrencySymbols, LetterlikeSymbols,
    NumberForms, MathematicalOperators, TechnicalSymbols,
    GeometricSymbols, MiscellaneousSymbols, EnclosedAndSquare, Braille,
    Unicode, Tagalog, Hanunoo, Buhid, Tagbanwa, KatakanaHalfWidth,
    Limbu, TaiLe }
QString defaultFamily () const
QString lastResortFamily () const
QString lastResortFont () const
QFont resolve ( const QFont & other ) const

Static Public Members 🌸

QString substitute ( const QString & familyName )
QStringList substitutes ( const QString & familyName )
QStringList substitutions ()
void insertSubstitution ( const QString & familyName, const QString &
    substituteName )
void insertSubstitutions ( const QString & familyName, const QStringList
    & substituteNames )
void removeSubstitution ( const QString & familyName )
QFont defaultFont ()  (obsolete)
void setDefaultFont ( const QFont & f )  (obsolete)

Protected Members 💜

bool dirty () const
int deciPointSize () const

these two live outside the class but they're besties with it fr:

QDataStream & operator<< ( QDataStream & s, const QFont & font )
QDataStream & operator>> ( QDataStream & s, QFont & font )

DESCRIPTION 👑

so. the QFont class specifies a font used for drawing text. that's the whole job. that's what it does. 💅

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 QFontMetrics to get measurements, e.g. the pixel length of a string using QFontMetrics::width().

Use QApplication::setFont() to set the application's default font.

If a choosen X11 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, Bold );
QFont sansFont( "Helvetica [Cronyx]", 12 );

The attributes set in the constructor can also be set later, e.g. setFamily(), setPointSize(), setPointSizeFloat(), setWeight() and setItalic(). The remaining attributes must be set after contstruction, 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().

The font-matching algorithm has a lastResortFamily() and lastResortFont() in cases where a suitable match cannot be found. You can provide substitutions for font family names using insertSubstitution() and insertSubstitutions(). Substitutions can be removed with removeSubstitution(). 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).

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.

Under the X Window System you can set a font using its system specific name with setRawName().

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: <ol type=1>

  1. The specified font family is searched for.
  2. If not found, the styleHint() is used to select a replacement family.
  3. Each replacement font family is searched for.
  4. If none of these are found or there was no styleHint(), "helvetica" will be searched for.
  5. If "helvetica" isn't found Qt will try the lastResortFamily().
  6. If the lastResortFamily() isn't found Qt will try the lastResortFont() which will always return a name of some kind.

Once a font is found, the remaining attributes are matched in order of priority: <ol type=1>

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

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 f1( "Helvetica [Cronyx]" );  // Qt 3.x
QFont f2( "Cronyx-Helvetica" );    // Qt 2.x compatibility

You can specify the foundry you want in the family name. Both fonts, f1 and f2, 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 pixelWidth = fm.width( "How many pixels wide is this text?" );
int pixelHeight = fm.height();

For more general information on fonts, see the comp.fonts FAQ. Information on encodings can be found from Roman Czyborra's page.

See also QFontMetrics, QFontInfo, QFontDatabase, QApplication::setFont(), QWidget::font, QPainter::setFont(), QFont::StyleHint, QFont::Weight, Widget Appearance and Style, Graphics Classes, and Implicitly and Explicitly Shared Classes.

Member Type Documentation 🦋

🌸 QFont::Script 🌸

Okay bestie, this enum is literally the whole Unicode script universe. For exhaustive coverage go look at The Unicode Standard Version 3.0. Here's the roster of what's supported:

Modern European alphabetic scripts (left to right):

  • QFont::Latin — consists of most alphabets based on the original Latin alphabet.
  • QFont::Greek — covers ancient and modern Greek and Coptic.
  • QFont::Cyrillic — covers the Slavic and non-Slavic languages using cyrillic alphabets.
  • QFont::Armenian — contains the Armenian alphabet used with the Armenian language.
  • QFont::Georgian — covers at least the language Georgian.
  • QFont::Runic — covers the known constituents of the Runic alphabets used by the early and medieval societies in the Germanic, Scandinavian, and Anglo-Saxon areas.
  • QFont::Ogham — is an alphabetical script used to write a very early form of Irish.
  • QFont::SpacingModifiers — are small signs indicating modifications to the preceeding letter.
  • QFont::CombiningMarks — consist of diacritical marks not specific to a particular alphabet, diacritical marks used in combination with mathematical and technical symbols, and glyph encodings applied to multiple letterforms.

Middle Eastern scripts (right to left):

  • QFont::Hebrew — is used for writing Hebrew, Yiddish, and some other languages.
  • QFont::Arabic — covers the Arabic language as well as Persian, Urdu, Kurdish and some others.
  • QFont::Syriac — is used to write the active liturgical languages and dialects of several Middle Eastern and Southeast Indian communities.
  • QFont::Thaana — is used to write the Maledivian Dhivehi language.

South and Southeast Asian scripts (left to right with few historical exceptions):

  • QFont::Devanagari — covers classical Sanskrit and modern Hindi as well as several other languages.
  • QFont::Bengali — is a relative to Devanagari employed to write the Bengali language used in West Bengal/India and Bangladesh as well as several minority languages.
  • QFont::Gurmukhi — is another Devanagari relative used to write Punjabi.
  • QFont::Gujarati — is closely related to Devanagari and used to write the Gujarati language of the Gujarat state in India.
  • QFont::Oriya — is used to write the Oriya language of Orissa state/India.
  • QFont::Tamil — is used to write the Tamil language of Tamil Nadu state/India, Sri Lanka, Singapore and parts of Malaysia as well as some minority languages.
  • QFont::Telugu — is used to write the Telugu language of Andhra Pradesh state/India and some minority languages.
  • QFont::Kannada — is another South Indian script used to write the Kannada language of Karnataka state/India and some minority languages.
  • QFont::Malayalam — is used to write the Malayalam language of Kerala state/India.
  • QFont::Sinhala — is used for Sri Lanka's majority language Sinhala and is also employed to write Pali, Sanskrit, and Tamil.
  • QFont::Thai — is used to write Thai and other Southeast Asian languages.
  • QFont::Lao — is a language and script quite similar to Thai.
  • QFont::Tibetan — is the script used to write Tibetan in several countries like Tibet, the bordering Indian regions and Nepal. It is also used in the Buddist philosophy and liturgy of the Mongolian cultural area.
  • QFont::Myanmar — is mainly used to write the Burmese language of Myanmar (former Burma).
  • QFont::Khmer — is the official language of Kampuchea.

East Asian scripts (traditionally top-down, right to left, modern often horizontal left to right):

  • QFont::Han — consists of the CJK (Chinese, Japanese, Korean) idiographic characters.
  • QFont::Hiragana — is a cursive syllabary used to indicate phonetics and pronounciation of Japanese words.
  • QFont::Katakana — is a non-cursive syllabic script used to write Japanese words with visual emphasis and non-Japanese words in a phonetical manner.
  • QFont::Hangul — is a Korean script consisting of alphabetic components.
  • QFont::Bopomofo — is a phonetic alphabet for Chinese (mainly Mandarin).
  • QFont::Yi — (also called Cuan or Wei) is a syllabary used to write the Yi language of Southwestern China, Myanmar, Laos, and Vietnam.

Additional scripts that do not fit well into the script categories above:

  • QFont::Ethiopic — is a syllabary used by several Central East African languages.
  • QFont::Cherokee — is a left-to-right syllabic script used to write the Cherokee language.
  • QFont::CanadianAboriginal — consists of the syllabics used by some Canadian aboriginal societies.
  • QFont::Mongolian — is the traditional (and recently reintroduced) script used to write Mongolian.

Symbols:

  • QFont::CurrencySymbols — contains currency symbols not encoded in other scripts.
  • QFont::LetterlikeSymbols — consists of symbols derived from ordinary letters of an alphabetical script.
  • QFont::NumberForms — are provided for compatibility with other existing character sets.
  • QFont::MathematicalOperators — consists of encodings for operators, relations and other symbols like arrows used in a mathematical context.
  • QFont::TechnicalSymbols — contains representations for control codes, the space symbol, APL symbols and other symbols mainly used in the context of electronic data processing.
  • QFont::GeometricSymbols — covers block elements and geometric shapes.
  • QFont::MiscellaneousSymbols — consists of a heterogeneous collection of symbols that do not fit any other Unicode character block, e.g. Dingbats.
  • QFont::EnclosedAndSquare — is provided for compatibility with some East Asian standards.
  • QFont::Braille — is an international writing system used by blind people. This script encodes the 256 eight-dot patterns with the 64 six-dot patterns as a subset.

And then these ones, no notes attached, just vibes:

  • QFont::Tagalog
  • QFont::Hanunoo
  • QFont::Buhid
  • QFont::Tagbanwa
  • QFont::KatakanaHalfWidth
  • QFont::Limbu — (Unicode 4.0)
  • QFont::TaiLe — (Unicode 4.0)
  • QFont::Unicode — includes all the above scripts.

🎀 QFont::Stretch 🎀

Predefined stretch values that follow the CSS naming convention. Cute, consistent, we love:

  • QFont::UltraCondensed — 50
  • QFont::ExtraCondensed — 62
  • QFont::Condensed — 75
  • QFont::SemiCondensed — 87
  • QFont::Unstretched — 100
  • QFont::SemiExpanded — 112
  • QFont::Expanded — 125
  • QFont::ExtraExpanded — 150
  • QFont::UltraExpanded — 200

See also setStretch() and stretch().

✨ 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. Like, "girl, if you can't find her, find someone who gives the same energy":

  • QFont::AnyStyle — leaves the font matching algorithm to choose the family. This is the default.
  • QFont::SansSerif — the font matcher prefer sans serif fonts.
  • QFont::Helvetica — is a synonym for SansSerif.
  • QFont::Serif — the font matcher prefers serif fonts.
  • QFont::Times — is a synonym for Serif.
  • QFont::TypeWriter — the font matcher prefers fixed pitch fonts.
  • QFont::Courier — a synonym for TypeWriter.
  • QFont::OldEnglish — the font matcher prefers decorative fonts.
  • QFont::Decorative — is a synonym for OldEnglish.
  • QFont::System — the font matcher prefers system fonts.

💅 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:

  • QFont::PreferDefault — the default style strategy. It does not prefer any type of font.
  • QFont::PreferBitmap — prefers bitmap fonts (as opposed to outline fonts).
  • QFont::PreferDevice — prefers device fonts.
  • QFont::PreferOutline — prefers outline fonts (as opposed to bitmap fonts).
  • QFont::ForceOutline — forces the use of outline fonts.
  • QFont::NoAntialias — don't antialias the fonts.
  • QFont::PreferAntialias — antialias if possible.
  • QFont::OpenGLCompatible — forces the use of OpenGL compatible fonts.

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

  • QFont::PreferMatch — prefer an exact match. The font matcher will try to use the exact font size that has been specified.
  • QFont::PreferQuality — prefer the best quality font. The font matcher will use the nearest standard point size that the font supports.

🦋 QFont::Weight 🦋

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 is ultralight, whilst 99 will be an extremely black.

This enum contains the predefined font weights:

  • QFont::Light — 25
  • QFont::Normal — 50
  • QFont::DemiBold — 63
  • QFont::Bold — 75
  • QFont::Black — 87

👑 MEMBER FUNCTION DOCUMENTATION 👑

💖 QFont::QFont () 💖

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

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

💖 QFont::QFont ( const QString & family, int pointSize = 12, int weight = Normal, bool italic = FALSE ) 💖

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

If pointSize is <= 0 it is set to 1.

The family name may optionally also include a foundry name, e.g. "Helvetica [Cronyx]". (The Qt 2.x syntax, i.e." Cronyx-Helvetica", is also supported.) 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, setFamily(), setPointSize(), setWeight(), setItalic(), setStyleHint(), and QApplication::font().

💖 QFont::QFont ( const QFont & font ) 💖

Constructs a font that is a copy of font.

💖 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::Normal; otherwise returns FALSE.

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

Example: chart/optionsform.cpp.

💖 int QFont::deciPointSize () const [protected] 💖

Returns the point size in 1/10ths of a point.

The returned value will be -1 if the font size has been specified in pixels.

See also pointSize() and pointSizeFloat().

💖 QString QFont::defaultFamily () const 💖

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

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

💖 QFont QFont::defaultFont () [static] 💖

This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.

Please use QApplication::font() instead.

💖 bool QFont::dirty () const [protected] 💖

Returns TRUE if the font attributes have been changed and the font has to be (re)loaded; otherwise returns FALSE.

💖 bool QFont::exactMatch () const 💖

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

See also QFontInfo.

💖 QString QFont::family () const 💖

Returns the requested font family name, i.e. the name set in the constructor or the last setFont() call.

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

Examples:

✨ QFont::fixedPitch () const ✨

okay so this one returns TRUE if fixed pitch has been set on the font, otherwise it's giving FALSE. that's it, that's the whole vibe.

see also setFixedPitch() and QFontInfo::fixedPitch() if you wanna go deeper 🫶

✨ QFont::fromString ( const QString & descrip ) ✨

bestie, this sets the font to match the description in descrip. and what even is that description? it's a comma-separated list of the font attributes, exactly the kind toString() hands you back. so it's like a little save file for your font's whole personality 💅

see also toString() and operator>>().

✨ QFont::handle () const ✨

returns the window system handle to the font, for low-level access. ngl, using this function is not portable — like at all — so don't go building your whole app around it, okay? 🙈

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

this one inserts the family name substituteName into the substitution table for familyName. basically you're telling Qt "hey, if someone asks for familyName, substituteName is a totally valid stand-in" 💖

see also insertSubstitutions(), removeSubstitution(), substitutions(), substitute(), and substitutes().

Example: fonts/simple-qfont-demo/viewer.cpp.

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

same energy as the one above, except you're inserting a whole list of families — substituteNames — into the substitution list for familyName. group chat, not a DM 🌸

see also insertSubstitution(), removeSubstitution(), substitutions(), and substitute().

Example: fonts/simple-qfont-demo/viewer.cpp.

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

returns TRUE if this font and f are copies of each other — meaning one of them was created as a copy of the other, and neither has been touched since. this is much stricter than equality, like the difference between "same outfit" and "literally the same person" 😭

see also operator=() and operator==().

✨ QFont::italic () const ✨

returns TRUE if italic has been set, otherwise FALSE. the classic slanted look, no notes 👑

see also setItalic().

Example: chart/optionsform.cpp.

✨ QFont::key () const ✨

returns the font's key — a textual representation of a font. it's typically used as the key for a cache or dictionary of fonts, so think of it as the font's @ handle for lookups ✨

see also QMap.

✨ QFont::lastResortFamily () const ✨

returns the "last resort" font family name. dramatic name, very real job.

the current implementation tries a wide variety of common fonts and returns the first one it finds. and yes, it is possible that no family is found — in which case a null string comes back. sad but true 💀

see also lastResortFont().

✨ QFont::lastResortFont () const ✨

returns a "last resort" font name for the font matching algorithm. this is the one that gets used if the last resort family isn't available. it will always return a name — if it has to, it'll return something like " fixed" or "system". it never leaves you on read 🫶

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.

and here's the spicy part: it is theoretically possible that there really isn't a lastResortFont(), in which case Qt will abort with an error message. they haven't been able to identify a case where this happens, so if it ever does — please report it as a bug, preferably with a list of the fonts you have installed. do it for the girlies 🙏

see also lastResortFamily() and rawName().

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

returns TRUE if this font is different from f, otherwise FALSE.

two QFonts count as different if their font attributes are different. but heads up: if rawMode() is enabled for both fonts, then only the family fields get compared. not the whole personality, just the name 😌

see also operator==().

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

assigns font to this font and returns a reference to it. glow-up by duplication 💖

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

returns TRUE if this font is equal to f, otherwise FALSE.

two QFonts count as equal if their font attributes are equal. and again, if rawMode() is enabled for both fonts, only the family fields are compared. same rule, different operator, we love consistency ✨

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

✨ QFont::overline () const ✨

returns TRUE if overline has been set, otherwise FALSE. yes, the line above the text. very 2000s MSN messenger of you 💅

see also setOverline().

✨ QFont::pixelSize () const ✨

returns the pixel size of the font if it was set with setPixelSize(). if the size was set with setPointSize() or setPointSizeFloat() instead, you get -1. it knows which method you used, it's keeping receipts 👀

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

✨ QFont::pointSize () const ✨

returns the point size of the font. and if the font size was specified in pixels instead? -1. that's the "wrong door, babe" number 🚪

see also setPointSize(), deciPointSize(), and pointSizeFloat().

Examples: the manual's got some for this one, go look.

✨ QFont::pointSizeFloat () const ✨

returns the point size of the font. and yeah, same deal — if the font size was specified in pixels, it returns -1.

see also pointSize(), setPointSizeFloat(), pixelSize(), QFontInfo::pointSize(), and QFontInfo::pixelSize().

✨ QFont::qwsRenderToDisk ( bool all = TRUE ) ✨

saves the glyphs in the font that have previously been accessed as a QPF file. if all is TRUE (which is the default, bestie), then before saving, all glyphs get marked as used.

so here's the money move: if the font is large and you're sure only a subset of characters will ever be required on the target device, passing FALSE for the all parameter can save a significant amount of disk space. iconic little optimization, no cap 💾

note that this function is only applicable on Qt/Embedded.

✨ QFont::rawMode () const ✨

returns TRUE if raw mode is used for font name matching, otherwise FALSE.

see also setRawMode() and rawName().

✨ QFont::rawName () const ✨

returns the name of the font within the underlying window system. it's giving "behind the scenes" energy ✨

on Windows, this is usually just the family name of a TrueType font.

on X11, it's an XLFD (X Logical Font Description). and when Qt is built with Xft support on X11, the return value can be an Xft pattern or an XLFD — so, surprise, pick your fighter 🌈

using the return value of this function is usually not portable. you've been warned 🫶

see also setRawName().

✨ QFont::removeSubstitution ( const QString & familyName ) [static] ✨

removes all the substitutions for familyName. full unfollow, no subtweets 💀

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

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

returns a new QFont that has attributes copied from other. new font, borrowed traits, main character energy 👑

✨ QFont::setBold ( bool enable ) ✨

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

and if you want finer boldness control, that's what setWeight() is for — setBold is just the on/off switch 💪

see also bold() and setWeight().

Examples: yep, the manual's got some for this one too.

✨ QFont::setDefaultFont ( const QFont & f ) [static] ✨

⚠️ this function is obsolete. it's provided to keep old source working, and they strongly advise against using it in new code. it's giving deprecated era, we don't do that anymore.

please use QApplication::setFont() instead. periodt.

✨ 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]". (the Qt 2.x syntax, i.e. " Cronyx-Helvetica", is also supported.) if the family is available from more than one foundry and the foundry isn't specified, an arbitrary foundry is chosen. and if the family isn't available at all, a family will be set using the font matching algorithm. it will always find you a font, it's a good friend like that 🫶

see also family(), setStyleHint(), and QFontInfo.

✨ QFont::setFixedPitch ( bool enable ) ✨

if enable is TRUE, sets fixed pitch on; otherwise sets fixed pitch off. monospace girlies rise 💅

see also fixedPitch() and QFontInfo.

✨ QFont::setItalic ( bool enable ) ✨

if enable is TRUE, italic is set on; otherwise italic is set off.

see also italic() and QFontInfo.

Examples: the manual's got a few, go check 'em.

✨ QFont::setOverline ( bool enable ) ✨

if enable is TRUE, sets overline on; otherwise sets overline off.

see also overline() and QFontInfo.

✨ QFont::setPixelSize ( int pixelSize ) ✨

sets the font size to pixelSize pixels.

heads up bestie: using this function makes the font device dependent. if you want the size set in a device independent manner, use setPointSize() or setPointSizeFloat() instead. choose wisely 🌸

see also pixelSize().

Example: qwerty/qwerty.cpp.

✨ QFont::setPixelSizeFloat ( float pixelSize ) ✨

⚠️ this function is obsolete. it's provided to keep old source working, and they strongly advise against using it in new code. respectfully, retire it.

sets the logical pixel height of font characters when shown on the screen to pixelSize.

✨ QFont::setPointSize ( int pointSize ) ✨

sets the point size to pointSize. and the point size must be greater than zero — that's the rule, no exceptions, don't test it 😤

see also pointSize() and setPointSizeFloat().

Example: fonts/simple-qfont-demo/viewer.cpp.

✨ QFont::setPointSizeFloat ( float pointSize ) ✨

sets the point size to pointSize. the point size must be greater than zero. and real talk: the requested precision may not be achieved on all platforms — so like, set your expectations accordingly, it's doing its best 🫶

see also pointSizeFloat(), setPointSize(), and setPixelSize().

✨ QFont::setRawMode ( bool enable ) ✨

if enable is TRUE, turns raw mode on; otherwise turns raw mode off. this function only has an effect under X11.

if raw mode is enabled, Qt will search for an X font with a complete font name matching the family name, ignoring all other values set for the QFont. if the font name matches several fonts, Qt will use the first font returned by X. and plot twist: QFontInfo cannot be used to fetch information about a QFont using raw mode — it will return the values set in the QFont for all parameters, including the family name. so it's lying to you a little bit 😭

🚨 Warning: do not use raw mode unless you really, really need it! in most (if not all) cases, setRawName() is a much better choice. i'm serious bestie, put it down.

see also rawMode() and setRawName().

✨ QFont::setRawName ( const QString & name ) ✨

sets a font by its system specific name. this function is particularly useful under X, where system font settings (for example X resources) are usually available in XLFD (X Logical Font Description) form only. you can pass an XLFD as name to this function. it's the plug-and-play of X font naming ✨

a font set with setRawName() is still a full-featured QFont. it can be queried (for example with italic()) or modified (for example with setItalic()) and is therefore also suitable for rendering rich text. so you're not losing anything, promise 💖

if Qt's internal font database cannot resolve the raw name, the font becomes a raw font with name as its family.

note that the present implementation does not handle wildcards in XLFDs well, and that font aliases (file fonts.alias in the font directory on X11) are not supported. so like, manage your expectations on that front 🙈

see also rawName(), setRawMode(), and setFamily().

✨ QFont::setStretch ( int factor ) ✨

sets the stretch factor for the font.

the stretch factor 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 default stretch factor is 100. the minimum stretch factor is 1, and the maximum stretch factor is 4000. so, yeah, wide girl summer 🌈

the stretch factor is only applied to outline fonts. the stretch factor is ignored for bitmap fonts. sorry bitmap fonts, you're not getting stretched today 💀

NOTE: QFont cannot stretch XLFD fonts. when loading XLFD fonts on X11, the stretch factor is matched against a predefined set of values for the SETWIDTH_NAME field of the XLFD.

see also stretch() and QFont::StyleStrategy.

✨ QFont::setStrikeOut ( bool enable ) ✨

if enable is TRUE, sets strikeout on; otherwise sets strikeout off. yes, the line through the middle. the "this take is cancelled" aesthetic 🔥

see also strikeOut() and QFontInfo.

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

Okay so this one sets the style hint and the style strategy — hint goes to the hint, strategy goes to the strategy. Two for one, we love a multitasker 💅

If you don't set these explicitly, the style hint defaults to AnyStyle and the style strategy defaults to PreferDefault. That's the vibe it ships with, no cap.

Heads up bestie: Qt does not support style hints on X11 since this information is not provided by the window system. So on X11 that part of the plot just… doesn't happen 😭

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

Examples:

void QFont::setStyleStrategy ( StyleStrategy s )

Sets the style strategy for the font to s. That's it, that's the whole function, and honestly? Iconic ✨

See also QFont::StyleStrategy.

void QFont::setUnderline ( bool enable )

If enable is TRUE, underline goes on. Otherwise underline goes off. Binary queen behavior 🎀

See also underline() and QFontInfo.

Examples:

void QFont::setWeight ( int weight )

Sets the weight of the font to weight, and weight should be a value from the QFont::Weight enumeration. Don't just make up a number, bestie, pick from the menu 🍓

See also weight() and QFontInfo.

Example: fonts/simple-qfont-demo/viewer.cpp.

int QFont::stretch () const

Returns the stretch factor for the font. Stretch check, but make it typography 💖

See also setStretch().

bool QFont::strikeOut () const

Returns TRUE if strikeout has been set; otherwise returns FALSE. Simple as that, no plot twist 🌸

See also setStrikeOut().

StyleHint QFont::styleHint () const

Returns the StyleHint.

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

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

StyleStrategy QFont::styleStrategy () const

Returns the StyleStrategy.

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

See also setStyleHint() and QFont::StyleHint.

QString QFont::substitute ( const QString & familyName ) [static]

Returns the first family name to be used whenever familyName is specified. The lookup is case insensitive — so it's not gonna get weird about your capital letters, we stan 🫶

If there is no substitution for familyName, then familyName is returned. It just hands you back what you gave it, like a mirror.

To obtain a list of substitutions use substitutes().

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

QStringList QFont::substitutes ( const QString & familyName ) [static]

Returns a list of family names to be used whenever familyName is specified. Lookup is case insensitive here too, obviously.

If there is no substitution for familyName, an empty list is returned. Not a substitute, not a stand-in, just nothing. It's giving silence 💀

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

Example: fonts/simple-qfont-demo/viewer.cpp.

QStringList QFont::substitutions () [static]

Returns a sorted list of substituted family names. Sorted!! Organized!! Main character energy 👑

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

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. So like, the font's little ID card, ready to be saved somewhere 🎀

See also fromString() and operator<<().

bool QFont::underline () const

Returns TRUE if underline has been set; otherwise returns FALSE.

See also setUnderline().

int QFont::weight () const

Returns the weight of the font, which is one of the enumerated values from QFont::Weight.

See also setWeight(), Weight, and QFontInfo.

QDataStream & operator<< ( QDataStream & s, const QFont & font )

Writes the font font to the data stream s. (toString() writes to a text stream, this one is the binary girlie.)

See also Format of the QDataStream operators.

QDataStream & operator>> ( QDataStream & s, QFont & font )

Reads the font font from the data stream s. (fromString() reads from a text stream, so know the difference bestie.)

See also Format of the QDataStream operators.

🌈 SEE ALSO 🌈

Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the license file included in the distribution for a complete license statement.

🎀 AUTHOR 🎀

Generated automatically from the source code. No human author to credit here, it literally wrote itself (well, the build system did) 💅

🐛 BUGS 🐛

If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html. Good bug reports help us to help you. Thank you. fr fr, a good bug report is a love letter 💖

The definitive Qt documentation is provided in HTML format; it is located at $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is provided as a convenience for those users who prefer man pages, although this format is not officially supported by Trolltech. So yes, you're reading the unofficial-but-beloved version 😌

If you find errors in this manual page, please report them to qt-bugs@trolltech.com. Please include the name of the manual page (qfont.3qt) and the Qt version (3.3.8). Don't forget the version, they need it, it's not optional bestie 🙈

And that's a wrap on QFont(3qt)! This page came from Trolltech AS and is dated 2 February 2007 — yes, 2007, a vintage drop, and it still ate 🫶 Go forth and set your fonts, bestie. Periodt. ✨

📦 where this page comes from