QFont Class Reference |
Constant | Value | Description |
---|---|---|
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().
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.
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 | ? | 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 | ? | is a synonym for Serif. |
QFont::TypeWriter | Courier | the font matcher prefers fixed pitch fonts. |
QFont::Courier | ? | a synonym for TypeWriter. |
QFont::OldEnglish | ? | the font matcher prefers decorative fonts. |
QFont::Decorative | OldEnglish | is a synonym for OldEnglish. |
QFont::System | ? | the font matcher prefers system fonts. |
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::PreferAntialias | 0x0080 | antialias if possible. |
QFont::OpenGLCompatible | 0x0200 | forces the use of OpenGL compatible fonts. |
QFont::NoFontMerging | 0x8000 | If a font does not contain a character requested to draw then Qt automatically chooses a similar looking for that contains the character. This flag disables this feature. |
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. |
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:
Constant | Value | Description |
---|---|---|
QFont::Light | 25 | 25 |
QFont::Normal | 50 | 50 |
QFont::DemiBold | 63 | 63 |
QFont::Bold | 75 | 75 |
QFont::Black | 87 | 87 |
Constructs a font object that uses the application's default font.
See also QApplication::setFont() and QApplication::font().
Constructs a font object with the specified family, pointSize, weight and italic settings.
If pointSize is <= 0, it is set to 12.
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.
See also Weight, setFamily(), setPointSize(), setWeight(), setItalic(), setStyleHint(), and QApplication::font().
Constructs a font from font for use on the paint device pd.
Constructs a font that is a copy of font.
Destroys the font object and frees all allocated resources.
Returns true if weight() is a value greater than QFont::Normal; otherwise returns false.
See also weight(), setBold(), and QFontInfo::bold().
Returns the family name that corresponds to the current style hint.
See also StyleHint, styleHint(), and setStyleHint().
Returns true if a window system font exactly matching the settings of this font is available.
See also QFontInfo.
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().
Returns true if fixed pitch has been set; otherwise returns false.
See also setFixedPitch() and QFontInfo::fixedPitch().
Returns the handle to the primary freetype face of the font. I font merging is not disabled a QFont can contain several physical fonts.
Returns 0 if the font does not contains a freetype face.
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().
Returns the window system handle to the font, for low-level access. Using this function is not portable.
Inserts substituteName into the substitution table for the family familyName.
See also insertSubstitutions(), removeSubstitution(), substitutions(), substitute(), and substitutes().
Inserts the list of families substituteNames into the substitution list for familyName.
See also insertSubstitution(), removeSubstitution(), substitutions(), and substitute().
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==().
Returns true if the style() of the font is not QFont::StyleNormal
See also setItalic() and style().
Returns true if kerning should be used when drawing text with this font.
See also 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.
See also 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.
See also 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.
See also lastResortFamily() and rawName().
Returns an ATSUFontID
Returns true if overline has been set; otherwise returns false.
See also setOverline().
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().
Returns the point size of the font. Returns -1 if the font size was specified in pixels.
See also setPointSize() and pointSizeF().
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().
Returns true if raw mode is used for font name matching; otherwise returns false.
See also setRawMode() and rawName().
Returns the name of the font within the underlying window system.
On Windows and Mac OS X, this is usually just the family name of a TrueType font.
On X11, depending on whether Qt was built with FontConfig support, it is an XLFD (X Logical Font Description) or a FontConfig pattern. An XLFD may be returned even if FontConfig support is enabled.
Using the return value of this function is usually not portable.
See also setRawName().
Removes all the substitutions for familyName.
See also insertSubstitutions(), insertSubstitution(), substitutions(), and substitute().
Returns a new QFont that has attributes copied from other that have not been previously set on this font.
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().
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.
See also family(), setStyleHint(), and QFontInfo.
If enable is true, sets fixed pitch on; otherwise sets fixed pitch off.
See also fixedPitch() and QFontInfo.
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.
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 neccesairly true.
See also kerning() and QFontMetrics.
If enable is true, sets overline on; otherwise sets overline off.
See also overline() and QFontInfo.
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().
Sets the point size to pointSize. The point size must be greater than zero.
See also pointSize() and setPointSizeF().
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().
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. 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).
Warning: Do not use raw mode unless you really, really need it! In most (if not all) cases, setRawName() is a much better choice.
See also rawMode() and setRawName().
Sets a font by its system specific name. The 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.
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.
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.
See also rawName(), setRawMode(), and setFamily().
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.
The stretch factor is only applied to outline fonts. The stretch factor is ignored for bitmap fonts.
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::Stretch.
If enable is true, sets strikeout on; otherwise sets strikeout off.
See also strikeOut() and QFontInfo.
Sets the style of the font to style.
See also style(), italic(), and QFontInfo.
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.
Sets the style strategy for the font to s.
See also styleStrategy() and QFont::StyleStrategy.
If enable is true, sets underline on; otherwise sets underline off.
See also underline() and QFontInfo.
Sets the weight the font to weight, which should be a value from the QFont::Weight enumeration.
See also weight() and QFontInfo.
Returns the stretch factor for the font.
See also setStretch().
Returns true if strikeout has been set; otherwise returns false.
See also setStrikeOut().
Returns the style of the font.
See also setStyle().
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().
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.
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 removeSubstitution().
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 removeSubstitution().
Returns a sorted list of substituted family names.
See also insertSubstitution(), removeSubstitution(), and substitute().
Returns a description of the font. The description is a comma-separated list of the attributes, perfectly suited for use in QSettings.
See also fromString().
Returns true if underline has been set; otherwise returns false.
See also setUnderline().
Returns the weight of the font which is one of the enumerated values from QFont::Weight.
See also setWeight(), Weight, and QFontInfo.
Returns the font as a QVariant
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. If rawMode() is enabled for both fonts, only the family fields are compared.
See also operator==().
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().
Assigns font to this font and returns a reference to it.
Returns true if this font is equal to f; otherwise returns false.
Two QFonts are considered equal if their font attributes are equal. If rawMode() is enabled for both fonts, only the family fields are compared.
See also operator!=() and isCopyOf().
This is an overloaded member function, provided for convenience.
Writes the font font to the data stream s. (toString() writes to a text stream.)
See also Format of the QDataStream operators.
This is an overloaded member function, provided for convenience.
Reads the font font from the data stream s. (fromString() reads from a text stream.)
See also Format of the QDataStream operators.
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