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java.lang.Objectcom.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.gui.QFontDatabase
public class QFontDatabase
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, e.g. "Helvetica [Adobe]" and "Helvetica [Cronyx]". When you specify a family you can either use the old hyphenated Qt 2.x "foundry-family" format, e.g. "Cronyx-Helvetica", or the new bracketed Qt 3.x "family [foundry]" format e.g. "Helvetica [Cronyx]". If the family has a foundry it is always returned, e.g. by families()
, using the bracketed format.
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 = new QFontDatabase(); QTreeWidget fontTree = new QTreeWidget(); fontTree.setColumnCount(2); List<String> headers = new Vector<String>(); headers.add("Font"); headers.add("Smooth Sizes"); fontTree.setHeaderLabels(headers); for (String family : database.families()) { QTreeWidgetItem familyItem = new QTreeWidgetItem(fontTree); familyItem.setText(0, family); for (String style : database.styles(family)) { QTreeWidgetItem styleItem = new QTreeWidgetItem(familyItem); styleItem.setText(0, style); String sizes = ""; for (int points : database.smoothSizes(family, style)) sizes += String.valueOf(points) + " "; styleItem.setText(1, sizes.trim()); } }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.
QFont
, QFontInfo
, QFontMetrics
, QFontComboBox
, and Character Map Example.
Nested Class Summary | |
---|---|
static class |
QFontDatabase.WritingSystem
|
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
---|
QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9 |
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal |
Field Summary |
---|
Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
currentSender |
Constructor Summary | |
---|---|
QFontDatabase()
Creates a font database object. |
Method Summary | |
---|---|
static int |
addApplicationFont(java.lang.String fileName)
Loads the font from the file specified by fileName and makes it available to the application. |
static int |
addApplicationFontFromData(QByteArray fontData)
Loads the font from binary data specified by fontData and makes it available to the application. |
static java.util.List |
applicationFontFamilies(int id)
Returns a list of font families for the given application font identified by id. |
boolean |
bold(java.lang.String family,
java.lang.String style)
Returns true if the font that has family family and style style is bold; otherwise returns false. |
QFontDatabase |
clone()
This method is reimplemented for internal reasons |
java.util.List |
families()
Returns a sorted list of the available font families. |
java.util.List |
families(QFontDatabase.WritingSystem writingSystem)
Returns a sorted list of the available font families which support the writingSystem. |
QFont |
font(java.lang.String family,
java.lang.String style,
int pointSize)
Returns a QFont object that has family family, style style and point size pointSize. |
boolean |
isBitmapScalable(java.lang.String family)
Returns true if the font that has family family and style style is a scalable bitmap font; otherwise returns false. |
boolean |
isBitmapScalable(java.lang.String family,
java.lang.String style)
Returns true if the font that has family family and style style is a scalable bitmap font; otherwise returns false. |
boolean |
isFixedPitch(java.lang.String family)
Returns true if the font that has family family and style style is fixed pitch; otherwise returns false. |
boolean |
isFixedPitch(java.lang.String family,
java.lang.String style)
Returns true if the font that has family family and style style is fixed pitch; otherwise returns false. |
boolean |
isScalable(java.lang.String family)
Returns true if the font that has family family and style style is scalable; otherwise returns false. |
boolean |
isScalable(java.lang.String family,
java.lang.String style)
Returns true if the font that has family family and style style is scalable; otherwise returns false. |
boolean |
isSmoothlyScalable(java.lang.String family)
Returns true if the font that has family family and style style is smoothly scalable; otherwise returns false. |
boolean |
isSmoothlyScalable(java.lang.String family,
java.lang.String style)
Returns true if the font that has family family and style style is smoothly scalable; otherwise returns false. |
boolean |
italic(java.lang.String family,
java.lang.String style)
Returns true if the font that has family family and style style is italic; otherwise returns false. |
java.util.List |
pointSizes(java.lang.String family)
Returns a list of the point sizes available for the font that has the specified family. |
java.util.List |
pointSizes(java.lang.String family,
java.lang.String style)
Returns a list of the point sizes available for the font that has family family and style style. |
static boolean |
removeAllApplicationFonts()
Removes all application-local fonts previously added using addApplicationFont() and addApplicationFontFromData() . |
static boolean |
removeApplicationFont(int id)
Removes the previously loaded application font identified by id. |
java.util.List |
smoothSizes(java.lang.String family,
java.lang.String style)
Returns the point sizes of a font that has family family and style style that will look attractive. |
static java.util.List |
standardSizes()
Returns a list of standard font sizes. |
java.util.List |
styles(java.lang.String family)
Returns a list of the styles available for the font family family. |
java.lang.String |
styleString(QFont font)
Returns a string that describes the style of the font. |
java.lang.String |
styleString(QFontInfo fontInfo)
Returns a string that describes the style of the fontInfo. |
static boolean |
supportsThreadedFontRendering()
Returns true if font rendering is supported outside the GUI thread, false otherwise. |
int |
weight(java.lang.String family,
java.lang.String style)
Returns the weight of the font that has family family and style style. |
static java.lang.String |
writingSystemName(QFontDatabase.WritingSystem writingSystem)
Returns the names the writingSystem (e.g. |
java.util.List |
writingSystems()
Returns a sorted list of the available writing systems. |
java.util.List |
writingSystems(java.lang.String family)
Returns a sorted list of the writing systems supported by a given font family. |
static java.lang.String |
writingSystemSample(QFontDatabase.WritingSystem writingSystem)
Returns a string with sample characters from writingSystem. |
Methods inherited from class com.trolltech.qt.QtJambiObject |
---|
dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
---|
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
__qt_signalInitialization |
Methods inherited from class java.lang.Object |
---|
getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
---|
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
---|
public QFontDatabase()
Method Detail |
---|
public final boolean bold(java.lang.String family, java.lang.String style)
italic()
, and weight()
.
public final java.util.List families()
public final java.util.List families(QFontDatabase.WritingSystem 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".
writingSystems()
.
public final QFont font(java.lang.String family, java.lang.String style, int pointSize)
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.
public final boolean isBitmapScalable(java.lang.String family)
smoothSizes()
. isScalable()
, and isSmoothlyScalable()
.
public final boolean isBitmapScalable(java.lang.String family, java.lang.String style)
smoothSizes()
. isScalable()
, and isSmoothlyScalable()
.
public final boolean isFixedPitch(java.lang.String family)
public final boolean isFixedPitch(java.lang.String family, java.lang.String style)
public final boolean isScalable(java.lang.String family)
isBitmapScalable()
, and isSmoothlyScalable()
.
public final boolean isScalable(java.lang.String family, java.lang.String style)
isBitmapScalable()
, and isSmoothlyScalable()
.
public final boolean isSmoothlyScalable(java.lang.String family)
isScalable()
, and isBitmapScalable()
.
public final boolean isSmoothlyScalable(java.lang.String family, java.lang.String style)
isScalable()
, and isBitmapScalable()
.
public final boolean italic(java.lang.String family, java.lang.String style)
weight()
, and bold()
.
public final java.util.List pointSizes(java.lang.String family)
public final java.util.List pointSizes(java.lang.String family, java.lang.String style)
smoothSizes()
, and standardSizes()
.
public final java.util.List smoothSizes(java.lang.String family, java.lang.String style)
pointSizes()
. pointSizes()
, and standardSizes()
.
public final java.lang.String styleString(QFont font)
public final java.lang.String styleString(QFontInfo fontInfo)
public final java.util.List styles(java.lang.String family)
families()
.
public final int weight(java.lang.String family, java.lang.String style)
italic()
, and bold()
.
public final java.util.List writingSystems()
families()
.
public final java.util.List writingSystems(java.lang.String family)
families()
.
public static int addApplicationFont(java.lang.String fileName)
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.
addApplicationFontFromData()
, applicationFontFamilies()
, and removeApplicationFont()
.
public static int addApplicationFontFromData(QByteArray fontData)
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.
addApplicationFont()
, applicationFontFamilies()
, and removeApplicationFont()
.
public static java.util.List applicationFontFamilies(int id)
addApplicationFont()
, and addApplicationFontFromData()
.
public static boolean removeAllApplicationFonts()
addApplicationFont()
and addApplicationFontFromData()
. Returns true if unloading of the fonts succeeded; otherwise returns false.
removeApplicationFont()
, addApplicationFont()
, and addApplicationFontFromData()
.
public static boolean removeApplicationFont(int id)
removeAllApplicationFonts()
, addApplicationFont()
, and addApplicationFontFromData()
.
public static java.util.List standardSizes()
smoothSizes()
, and pointSizes()
.
public static boolean supportsThreadedFontRendering()
QPainter::drawText()
calls outside the GUI thread will not produce readable output.
public static java.lang.String writingSystemName(QFontDatabase.WritingSystem writingSystem)
public static java.lang.String writingSystemSample(QFontDatabase.WritingSystem writingSystem)
public QFontDatabase clone()
clone
in class java.lang.Object
|
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