QFontInfo Class Reference

Detailed Description

The QFontInfo class provides general information about fonts.

The QFontInfo class provides the same access functions as QFont, e.g. family(), pointSize(), italic(), weight(), fixedPitch(), styleHint() etc. But whilst the QFont access functions return the values that were set, a QFontInfo object returns the values that apply to the font that will actually be used to draw the text.

For example, when the program asks for a 25pt Courier font on a machine that has a non-scalable 24pt Courier font, QFont will (normally) use the 24pt Courier for rendering. In this case, QFont::pointSize() returns 25 and QFontInfo::pointSize() returns 24.

There are three ways to create a QFontInfo object.

1. Calling the QFontInfo constructor with a QFont creates a font info object for a screen-compatible font, i.e. the font cannot be a printer font^*. If the font is changed later, the font info object is not updated.

2. QWidget::fontInfo() returns the font info for a widget's font. This is equivalent to calling QFontInfo(widget->font()). If the widget's font is changed later, the font info object is not updated.

3. QPainter::fontInfo() returns the font info for a painter's current font. The font info object is automatically updated if you set a new painter font.

^* If you use a printer font the values returned will almost certainly be inaccurate. Printer fonts are not always accessible so the nearest screen font is used if a printer font is supplied.

See also QFont, QFontMetrics, QFontDatabase, Graphics Classes and Implicitly and Explicitly Shared Classes.

Member Function Documentation

QFontInfo::QFontInfo ( const QFont & font )

The font must be screen-compatible, i.e. a font you use when drawing text in widgets or pixmaps, not QPicture or QPrinter.

The font info object holds the information for the font that is passed in the constructor at the time it is created, and is not updated if the font's attributes are changed later.

Use the QPainter::fontInfo() function to get the font info when painting. This is a little slower than using this constructor, but it always gives correct results because the font info data is updated.

QFontInfo::QFontInfo ( const QFontInfo & fi )

QFontInfo::~QFontInfo ()

bool QFontInfo::bold () const

Returns TRUE if weight() would return a value greater than QFont::Normal; otherwise returns FALSE.

See also weight() and QFont::bold().

bool QFontInfo::exactMatch () const

See also QFont::exactMatch().

QString QFontInfo::family () const

See also QFont::family().

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

bool QFontInfo::fixedPitch () const

See also QFont::fixedPitch().

bool QFontInfo::italic () const

See also QFont::italic().

QFontInfo & QFontInfo::operator= ( const QFontInfo & fi )

int QFontInfo::pixelSize () const

See also QFont::pointSize().

int QFontInfo::pointSize () const

See also QFont::pointSize().

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

bool QFontInfo::rawMode () const

If it is a raw mode font, all other functions in QFontInfo will return the same values set in the QFont, regardless of the font actually used.

See also QFont::rawMode().

QFont::StyleHint QFontInfo::styleHint () const

Currently only returns the style hint set in QFont.

See also QFont::styleHint() and QFont::StyleHint.

int QFontInfo::weight () const

See also QFont::weight() and bold().

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