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QFontDatabase Class Reference
^{^{[QtGui module]}}

The QFontDatabase class provides information about the fonts available in the underlying window system. More...

Types

enum WritingSystem { Any, Latin, Greek, Cyrillic, ..., Nko }

Methods

__init__ (self)
__init__ (self, QFontDatabase)
bool bold (self, QString family, QString style)
QStringList families (self, WritingSystem writingSystem = QFontDatabase.Any)
QFont font (self, QString family, QString style, int pointSize)
bool isBitmapScalable (self, QString family, QString style = QString())
bool isFixedPitch (self, QString family, QString style = QString())
bool isScalable (self, QString family, QString style = QString())
bool isSmoothlyScalable (self, QString family, QString style = QString())
bool italic (self, QString family, QString style)
list-of-int pointSizes (self, QString family, QString style = QString())
list-of-int smoothSizes (self, QString family, QString style)
QStringList styles (self, QString family)
QString styleString (self, QFont font)
QString styleString (self, QFontInfo fontInfo)
int weight (self, QString family, QString style)
list-of-QFontDatabase.WritingSystem writingSystems (self)
list-of-QFontDatabase.WritingSystem writingSystems (self, QString family)

Static Methods

int addApplicationFont (QString fileName)
int addApplicationFontFromData (QByteArray fontData)
QStringList applicationFontFamilies (int id)
bool removeAllApplicationFonts ()
bool removeApplicationFont (int id)
list-of-int standardSizes ()
bool supportsThreadedFontRendering ()
QString writingSystemName (WritingSystem writingSystem)
QString writingSystemSample (WritingSystem writingSystem)

Detailed Description

The QFontDatabase class provides information about the fonts available in the underlying window system.

The most common uses of this class are to query the database for the list of font families() and for the pointSizes() and styles() that are available for each family. An alternative to pointSizes() is smoothSizes() which returns the sizes at which a given family and style will look attractive.

If the font family is available from two or more foundries the foundry name is included in the family name; for example: "Helvetica [Adobe]" and "Helvetica [Cronyx]". When you specify a family, you can either use the old hyphenated "foundry-family" format or the bracketed "family [foundry]" format; for example: "Cronyx-Helvetica" or "Helvetica [Cronyx]". If the family has a foundry it is always returned using the bracketed format, as is the case with the value returned by families().

The font() function returns a QFont given a family, style and point size.

A family and style combination can be checked to see if it is italic() or bold(), and to retrieve its weight(). Similarly we can call isBitmapScalable(), isSmoothlyScalable(), isScalable() and isFixedPitch().

Use the styleString() to obtain a text version of a style.

The QFontDatabase class also supports some static functions, for example, standardSizes(). You can retrieve the description of a writing system using writingSystemName(), and a sample of characters in a writing system with writingSystemSample().

Example:

     QFontDatabase database;
     QTreeWidget fontTree;
     fontTree.setColumnCount(2);
     fontTree.setHeaderLabels(QStringList() << "Font" << "Smooth Sizes");

     foreach (const QString &family, database.families()) {
         QTreeWidgetItem *familyItem = new QTreeWidgetItem(&fontTree);
         familyItem->setText(0, family);

         foreach (const QString &style, database.styles(family)) {
             QTreeWidgetItem *styleItem = new QTreeWidgetItem(familyItem);
             styleItem->setText(0, style);

             QString sizes;
             foreach (int points, database.smoothSizes(family, style))
                 sizes += QString.number(points) + " ";

             styleItem->setText(1, sizes.trimmed());
         }
     }

This example gets the list of font families, the list of styles for each family, and the point sizes that are available for each combination of family and style, displaying this information in a tree view.

Type Documentation

QFontDatabase.WritingSystem

Constant	Value	Description
`QFontDatabase.Any`	`0`
`QFontDatabase.Latin`	`1`
`QFontDatabase.Greek`	`2`
`QFontDatabase.Cyrillic`	`3`
`QFontDatabase.Armenian`	`4`
`QFontDatabase.Hebrew`	`5`
`QFontDatabase.Arabic`	`6`
`QFontDatabase.Syriac`	`7`
`QFontDatabase.Thaana`	`8`
`QFontDatabase.Devanagari`	`9`
`QFontDatabase.Bengali`	`10`
`QFontDatabase.Gurmukhi`	`11`
`QFontDatabase.Gujarati`	`12`
`QFontDatabase.Oriya`	`13`
`QFontDatabase.Tamil`	`14`
`QFontDatabase.Telugu`	`15`
`QFontDatabase.Kannada`	`16`
`QFontDatabase.Malayalam`	`17`
`QFontDatabase.Sinhala`	`18`
`QFontDatabase.Thai`	`19`
`QFontDatabase.Lao`	`20`
`QFontDatabase.Tibetan`	`21`
`QFontDatabase.Myanmar`	`22`
`QFontDatabase.Georgian`	`23`
`QFontDatabase.Khmer`	`24`
`QFontDatabase.SimplifiedChinese`	`25`
`QFontDatabase.TraditionalChinese`	`26`
`QFontDatabase.Japanese`	`27`
`QFontDatabase.Korean`	`28`
`QFontDatabase.Vietnamese`	`29`
`QFontDatabase.Symbol`	`30`
`QFontDatabase.Other`	`Symbol`	(the same as Symbol)
`QFontDatabase.Ogham`	?
`QFontDatabase.Runic`	?
`QFontDatabase.Nko`	?

Method Documentation

QFontDatabase.init (self)

Creates a font database object.

QFontDatabase.init (self, QFontDatabase)

int QFontDatabase.addApplicationFont (QString fileName)

Loads the font from the file specified by fileName and makes it available to the application. An ID is returned that can be used to remove the font again with removeApplicationFont() or to retrieve the list of family names contained in the font.

The function returns -1 if the font could not be loaded.

Currently only TrueType fonts, TrueType font collections, and OpenType fonts are supported.

Note: Adding application fonts on Unix/X11 platforms without fontconfig is currently not supported.

Note: On Symbian, the font family names get truncated to a length of 20 characters.

This function was introduced in Qt 4.2.

int QFontDatabase.addApplicationFontFromData (QByteArray fontData)

Loads the font from binary data specified by fontData and makes it available to the application. An ID is returned that can be used to remove the font again with removeApplicationFont() or to retrieve the list of family names contained in the font.

The function returns -1 if the font could not be loaded.

Currently only TrueType fonts and TrueType font collections are supported.

Note: Adding application fonts on Unix/X11 platforms without fontconfig is currently not supported.

Note: On Symbian, the font family names get truncated to a length of 20 characters.

This function was introduced in Qt 4.2.

See also addApplicationFont(), applicationFontFamilies(), and removeApplicationFont().

QStringList QFontDatabase.applicationFontFamilies (int id)

Returns a list of font families for the given application font identified by id.

This function was introduced in Qt 4.2.

bool QFontDatabase.bold (self, QString family, QString style)

Returns true if the font that has family family and style style is bold; otherwise returns false.

See also italic() and weight().

QStringList QFontDatabase.families (self, WritingSystem writingSystem = QFontDatabase.Any)

Returns a sorted list of the available font families which support the writingSystem.

If a family exists in several foundries, the returned name for that font is in the form "family [foundry]". Examples: "Times [Adobe]", "Times [Cronyx]", "Palatino".

See also writingSystems().

QFont QFontDatabase.font (self, QString family, QString style, int pointSize)

Returns a QFont object that has family family, style style and point size pointSize. If no matching font could be created, a QFont object that uses the application's default font is returned.