Manages available fonts and font installation for a QGIS instance. More...

#include <qgsfontmanager.h>

Inheritance diagram for QgsFontManager:

Signals
void	fontDownloaded (const QStringList &families, const QString &licenseDetails)
	Emitted when a font has downloaded and been locally loaded. More...

void	fontDownloadErrorOccurred (const QUrl &url, const QString &identifier, const QString &error)
	Emitted when an error occurs during font downloading. More...

Public Member Functions
	QgsFontManager (QObject *parent=nullptr)
	Constructor for QgsFontManager, with the specified parent object. More...

void	addFontFamilyReplacement (const QString &original, const QString &replacement)
	Adds a new font replacement from the original font family to a replacement font family. More...

void	addUserFontDirectory (const QString &directory)
	Adds a directory to use for user fonts. More...

void	downloadAndInstallFont (const QUrl &url, const QString &identifier=QString())
	Downloads a font and installs in the user's profile/fonts directory as an application font. More...

void	enableFontDownloadsForSession ()
	Enables font downloads the the current QGIS session. More...

QMap< QString, QString >	fontFamilyReplacements () const
	Returns the map of automatic font family replacements. More...

bool	installFontsFromData (const QByteArray &data, QString &errorMessage, QStringList &families, QString &licenseDetails, const QString &filename=QString())
	Installs local user fonts from the specified raw data. More...

void	installUserFonts ()
	Installs user fonts from the profile/fonts directory as application fonts. More...

QString	processFontFamilyName (const QString &name) const
	Processes a font family name, applying any matching fontFamilyReplacements() to the name. More...

bool	removeUserFont (const QString &path)
	Removes the user font at the specified path. More...

void	setFontFamilyReplacements (const QMap< QString, QString > &replacements)
	Sets the map of automatic font family replacements. More...

bool	tryToDownloadFontFamily (const QString &family, QString &matchedFamily)
	Tries to download and install the specified font family. More...

QString	urlForFontDownload (const QString &family, QString &matchedFamily) const
	Returns the URL at which the font family can be downloaded. More...

QMap< QString, QStringList >	userFontToFamilyMap () const
	Returns the mapping of installed user fonts to font families. More...

Static Public Attributes
static const QgsSettingsEntryBool *	settingsDownloadMissingFonts = new QgsSettingsEntryBool( QStringLiteral( "downloadMissingFonts" ), QgsSettingsTree::sTreeFonts, true, QStringLiteral( "Automatically download missing fonts whenever possible" ) )
	Settings entry for font family replacements. More...

static const QgsSettingsEntryStringList *	settingsFontFamilyReplacements = new QgsSettingsEntryStringList( QStringLiteral( "fontFamilyReplacements" ), QgsSettingsTree::sTreeFonts, QStringList(), QStringLiteral( "Automatic font family replacements" ) )
	Settings entry for font family replacements. More...

Detailed Description

Manages available fonts and font installation for a QGIS instance.

Note: QgsFontManager is not usually directly created, but rather accessed through QgsApplication::fontManager().

Since: QGIS 3.28

Definition at line 37 of file qgsfontmanager.h.

Constructor & Destructor Documentation

◆ QgsFontManager()

QgsFontManager::QgsFontManager ( QObject * parent = nullptr )

explicit

Constructor for QgsFontManager, with the specified parent object.

Note: QgsFontManager is not usually directly created, but rather accessed through QgsApplication::fontManager().

Definition at line 35 of file qgsfontmanager.cpp.

Member Function Documentation

◆ addFontFamilyReplacement()

void QgsFontManager::addFontFamilyReplacement	(	const QString &	original,
		const QString &	replacement
	)

Adds a new font replacement from the original font family to a replacement font family.

This is used to transparently map an original font family to an alternative font family, e.g. to permit graceful handling of opening projects which reference fonts which are not available on the system.

The replacement map is stored locally and persists across QGIS sessions.

If replacement is an empty string then any existing mapping for the original family will be removed.

Note: This method is thread safe.

See also: fontFamilyReplacements(); setFontFamilyReplacements()

Definition at line 57 of file qgsfontmanager.cpp.

◆ addUserFontDirectory()

void QgsFontManager::addUserFontDirectory ( const QString & directory )

Adds a directory to use for user fonts.

This directory will be scanned for any TTF or OTF font files, which will automatically be added and made available for use in the QGIS session.

Additionally, if this is the first user font directory added, any fonts downloaded via downloadAndInstallFont() will be installed into this directory.

Definition at line 1995 of file qgsfontmanager.cpp.

◆ downloadAndInstallFont()

void QgsFontManager::downloadAndInstallFont	(	const QUrl &	url,
		const QString &	identifier = `QString()`
	)

Downloads a font and installs in the user's profile/fonts directory as an application font.

The download will proceed in a background task.

The optional identifier string can be used to specify a user-friendly name for the download tasks, e.g. the font family name if known.

See also: fontDownloaded(); fontDownloadErrorOccurred()

Definition at line 1823 of file qgsfontmanager.cpp.

◆ enableFontDownloadsForSession()

void QgsFontManager::enableFontDownloadsForSession ( )

Enables font downloads the the current QGIS session.

Warning: Ensure that the QgsApplication is fully initialized before calling this method.

Definition at line 183 of file qgsfontmanager.cpp.

◆ fontDownloaded

void QgsFontManager::fontDownloaded	(	const QStringList &	families,
		const QString &	licenseDetails
	)

signal

Emitted when a font has downloaded and been locally loaded.

The families list specifies the font families contained in the downloaded font.

If found, the licenseDetails string will be populated with corresponding font license details.

See also: downloadAndInstallFont(); fontDownloadErrorOccurred()

◆ fontDownloadErrorOccurred

void QgsFontManager::fontDownloadErrorOccurred	(	const QUrl &	url,
		const QString &	identifier,
		const QString &	error
	)

signal

Emitted when an error occurs during font downloading.

See also: downloadAndInstallFont(); fontDownloaded()

◆ fontFamilyReplacements()

QMap< QString, QString > QgsFontManager::fontFamilyReplacements ( ) const

Returns the map of automatic font family replacements.

This map is used to transparently map an original font family to an alternative font family, e.g. to permit graceful handling of opening projects which reference fonts which are not available on the system.

The map keys are the original font family names, and the values are the alternative replacement family to use for the font.

Note: This method is thread safe.

See also: addFontFamilyReplacement(); setFontFamilyReplacements()

Definition at line 51 of file qgsfontmanager.cpp.

◆ installFontsFromData()

bool QgsFontManager::installFontsFromData	(	const QByteArray &	data,
		QString &	errorMessage,
		QStringList &	families,
		QString &	licenseDetails,
		const QString &	filename = `QString()`
	)

Installs local user fonts from the specified raw data.

The data array may correspond to the contents of a TTF or OTF font file, or a zipped archive of font files.

Parameters

data	raw font data or zipped font data
errorMessage	will be set to a descriptive error message if the installation fails
families	will be populated with a list of font families installed from the data
licenseDetails	will be populated with font license details, if found
filename	filename hint for destination file. Will be ignored for archived content (e.g. zip file data)

Returns: true if installation was successful.

Definition at line 1868 of file qgsfontmanager.cpp.

◆ installUserFonts()

void QgsFontManager::installUserFonts ( )

Installs user fonts from the profile/fonts directory as application fonts.

Note: Not available in Python bindings

Definition at line 102 of file qgsfontmanager.cpp.

◆ processFontFamilyName()

QString QgsFontManager::processFontFamilyName ( const QString & name ) const

Processes a font family name, applying any matching fontFamilyReplacements() to the name.

Note: This method is thread safe.

Definition at line 84 of file qgsfontmanager.cpp.

◆ removeUserFont()

bool QgsFontManager::removeUserFont ( const QString & path )

Removes the user font at the specified path.

Definition at line 2020 of file qgsfontmanager.cpp.

◆ setFontFamilyReplacements()

void QgsFontManager::setFontFamilyReplacements ( const QMap< QString, QString > & replacements )

Sets the map of automatic font family replacements.

This map is used to transparently map an original font family to an alternative font family, e.g. to permit graceful handling of opening projects which reference fonts which are not available on the system.

The map keys are the original font family names, and the values are the alternative replacement family to use for the font.

The replacement map is stored locally and persists across QGIS sessions.

Note: This method is thread safe.

See also: fontFamilyReplacements(); addFontFamilyReplacement()

Definition at line 73 of file qgsfontmanager.cpp.

◆ tryToDownloadFontFamily()

bool QgsFontManager::tryToDownloadFontFamily	(	const QString &	family,
		QString &	matchedFamily
	)

Tries to download and install the specified font family.

This method will attempt to download missing fonts, if the font download URL is known and the font is freely licensed.

Returns true if a download link for the family is known and the download has commenced, or false if the family is not known and cannot be automatically downloaded.

The actual download operation occurs in a background task, and this method returns immediately. Connect to fontDownloaded() in order to respond when the font is installed and available for use.

Warning: Before calling this method a QgsApplication must be fully initialized and a call to enableFontDownloadsForSession() made.

Parameters

family	input font family name to try to match to known fonts
matchedFamily	will be set to found font family if a match was successful

Returns: true if match was successful and the download will occur

Definition at line 143 of file qgsfontmanager.cpp.

◆ urlForFontDownload()

QString QgsFontManager::urlForFontDownload	(	const QString &	family,
		QString &	matchedFamily
	)		const

Returns the URL at which the font family can be downloaded.

This method relies on a hardcoded list of available freely licensed fonts, and will return an empty string for any font families not present in this list.

Parameters

family	input font family name to try to match to known fonts
matchedFamily	will be set to found font family if a match was successful

Returns: URL to download font, or an empty string if no URL is available

Definition at line 201 of file qgsfontmanager.cpp.

◆ userFontToFamilyMap()

QMap< QString, QStringList > QgsFontManager::userFontToFamilyMap ( ) const

Returns the mapping of installed user fonts to font families.

The map keys are the file names, the values are a list of families provided by the file.

Definition at line 2014 of file qgsfontmanager.cpp.

Member Data Documentation

◆ settingsDownloadMissingFonts

const QgsSettingsEntryBool * QgsFontManager::settingsDownloadMissingFonts = new QgsSettingsEntryBool( QStringLiteral( "downloadMissingFonts" ), QgsSettingsTree::sTreeFonts, true, QStringLiteral( "Automatically download missing fonts whenever possible" ) )

static

Settings entry for font family replacements.

Definition at line 48 of file qgsfontmanager.h.

◆ settingsFontFamilyReplacements

const QgsSettingsEntryStringList * QgsFontManager::settingsFontFamilyReplacements = new QgsSettingsEntryStringList( QStringLiteral( "fontFamilyReplacements" ), QgsSettingsTree::sTreeFonts, QStringList(), QStringLiteral( "Automatic font family replacements" ) )

static

Settings entry for font family replacements.

Definition at line 45 of file qgsfontmanager.h.

The documentation for this class was generated from the following files:

/build/qgis-3.37.0+git20240325+fdefdf9c27f+17bookworm/src/core/textrenderer/qgsfontmanager.h
/build/qgis-3.37.0+git20240325+fdefdf9c27f+17bookworm/src/core/textrenderer/qgsfontmanager.cpp

Signals

Public Member Functions

Static Public Attributes

Detailed Description

Constructor & Destructor Documentation

◆ QgsFontManager()

Member Function Documentation

◆ addFontFamilyReplacement()

◆ addUserFontDirectory()

◆ downloadAndInstallFont()

◆ enableFontDownloadsForSession()

◆ fontDownloaded

◆ fontDownloadErrorOccurred

◆ fontFamilyReplacements()

◆ installFontsFromData()

◆ installUserFonts()

◆ processFontFamilyName()

◆ removeUserFont()

◆ setFontFamilyReplacements()

◆ tryToDownloadFontFamily()

◆ urlForFontDownload()

◆ userFontToFamilyMap()

Member Data Documentation

◆ settingsDownloadMissingFonts

◆ settingsFontFamilyReplacements