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qgsfontutils.cpp
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qgsfontutils.cpp
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/***************************************************************************
qgsfontutils.h
---------------------
begin : June 5, 2013
copyright : (C) 2013 by Larry Shaffer
email : larrys at dakotacarto dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsfontutils.h"
#include "qgsapplication.h"
#include "qgslogger.h"
#include <QApplication>
#include <QFile>
#include <QFont>
#include <QFontDatabase>
#include <QFontInfo>
#include <QStringList>
bool QgsFontUtils::fontMatchOnSystem( const QFont& f )
{
QFontInfo fi = QFontInfo( f );
return fi.exactMatch();
}
bool QgsFontUtils::fontFamilyOnSystem( const QString& family )
{
QFont tmpFont = QFont( family );
// compare just beginning of family string in case 'family [foundry]' differs
return tmpFont.family().startsWith( family, Qt::CaseInsensitive );
}
bool QgsFontUtils::fontFamilyHasStyle( const QString& family, const QString& style )
{
QFontDatabase fontDB;
return ( fontFamilyOnSystem( family ) && fontDB.styles( family ).contains( style ) );
}
bool QgsFontUtils::fontFamilyMatchOnSystem( const QString& family, QString* chosen, bool* match )
{
QFontDatabase fontDB;
QStringList fontFamilies = fontDB.families();
bool found = false;
QList<QString>::const_iterator it = fontFamilies.constBegin();
for ( ; it != fontFamilies.constEnd(); ++it )
{
// first compare just beginning of 'family [foundry]' string
if ( it->startsWith( family, Qt::CaseInsensitive ) )
{
found = true;
// keep looking if match info is requested
if ( match )
{
// full 'family [foundry]' strings have to match
*match = ( *it == family );
if ( *match )
break;
}
else
{
break;
}
}
}
if ( found )
{
if ( chosen )
{
// retrieve the family actually assigned by matching algorithm
QFont f = QFont( family );
*chosen = f.family();
}
}
else
{
if ( chosen )
{
*chosen = QString();
}
if ( match )
{
*match = false;
}
}
return found;
}
bool QgsFontUtils::updateFontViaStyle( QFont& f, const QString& fontstyle, bool fallback )
{
if ( fontstyle.isEmpty() )
{
return false;
}
QFontDatabase fontDB;
if ( !fallback )
{
// does the font even have the requested style?
bool hasstyle = fontFamilyHasStyle( f.family(), fontstyle );
if ( !hasstyle )
{
return false;
}
}
// is the font's style already the same as requested?
if ( fontstyle == fontDB.styleString( f ) )
{
return false;
}
QFont appfont = QApplication::font();
int defaultSize = appfont.pointSize(); // QFontDatabase::font() needs an integer for size
QFont styledfont;
bool foundmatch = false;
// if fontDB.font() fails, it returns the default app font; but, that may be the target style
styledfont = fontDB.font( f.family(), fontstyle, defaultSize );
if ( appfont != styledfont || fontstyle != fontDB.styleString( f ) )
{
foundmatch = true;
}
// default to first found style if requested style is unavailable
// this helps in the situations where the passed-in font has to have a named style applied
if ( fallback && !foundmatch )
{
QFont testFont = QFont( f );
testFont.setPointSize( defaultSize );
// prefer a style that mostly matches the passed-in font
foreach ( const QString &style, fontDB.styles( f.family() ) )
{
styledfont = fontDB.font( f.family(), style, defaultSize );
styledfont = styledfont.resolve( f );
if ( testFont.toString() == styledfont.toString() )
{
foundmatch = true;
break;
}
}
// fallback to first style found that works
if ( !foundmatch )
{
foreach ( const QString &style, fontDB.styles( f.family() ) )
{
styledfont = fontDB.font( f.family(), style, defaultSize );
if ( QApplication::font() != styledfont )
{
foundmatch = true;
break;
}
}
}
}
// similar to QFont::resolve, but font may already have pixel size set
// and we want to make sure that's preserved
if ( foundmatch )
{
if ( f.pointSizeF() != -1 )
{
styledfont.setPointSizeF( f.pointSizeF() );
}
else if ( f.pixelSize() != -1 )
{
styledfont.setPixelSize( f.pixelSize() );
}
styledfont.setCapitalization( f.capitalization() );
styledfont.setUnderline( f.underline() );
styledfont.setStrikeOut( f.strikeOut() );
styledfont.setWordSpacing( f.wordSpacing() );
styledfont.setLetterSpacing( QFont::AbsoluteSpacing, f.letterSpacing() );
f = styledfont;
return true;
}
return false;
}
QString QgsFontUtils::standardTestFontFamily()
{
return "QGIS Vera Sans";
}
bool QgsFontUtils::loadStandardTestFonts( QStringList loadstyles )
{
// load standard test font from filesystem or testdata.qrc (for unit tests and general testing)
bool fontsLoaded = false;
QString fontFamily = standardTestFontFamily();
QMap<QString, QString> fontStyles;
fontStyles.insert( "Roman", "QGIS-Vera/QGIS-Vera.ttf" );
fontStyles.insert( "Oblique", "QGIS-Vera/QGIS-VeraIt.ttf" );
fontStyles.insert( "Bold", "QGIS-Vera/QGIS-VeraBd.ttf" );
fontStyles.insert( "Bold Oblique", "QGIS-Vera/QGIS-VeraBI.ttf" );
QMap<QString, QString>::const_iterator f = fontStyles.constBegin();
for ( ; f != fontStyles.constEnd(); ++f )
{
QString fontstyle( f.key() );
QString fontpath( f.value() );
if ( !( loadstyles.contains( fontstyle ) || loadstyles.contains( "All" ) ) )
{
continue;
}
QString familyStyle = QString( "%1 %2" ).arg( fontFamily ).arg( fontstyle );
if ( fontFamilyHasStyle( fontFamily, fontstyle ) )
{
fontsLoaded = ( fontsLoaded || false );
QgsDebugMsg( QString( "Test font '%1' already available" ).arg( familyStyle ) );
}
else
{
bool loaded = false;
if ( QgsApplication::isRunningFromBuildDir() )
{
// workaround for bugs with Qt 4.8.5 (other versions?) on Mac 10.9, where fonts
// from qrc resources load but fail to work and default font is substituted [LS]:
// https://bugreports.qt-project.org/browse/QTBUG-30917
// https://bugreports.qt-project.org/browse/QTBUG-32789
QString fontPath( QgsApplication::buildSourcePath() + "/tests/testdata/font/" + fontpath );
int fontID = QFontDatabase::addApplicationFont( fontPath );
loaded = ( fontID != -1 );
fontsLoaded = ( fontsLoaded || loaded );
QgsDebugMsg( QString( "Test font '%1' %2 from filesystem" )
.arg( familyStyle ).arg( loaded ? "loaded" : "FAILED to load" ) );
}
else
{
QFile fontResource( ":/testdata/font/" + fontpath );
if ( fontResource.open( QIODevice::ReadOnly ) )
{
int fontID = QFontDatabase::addApplicationFontFromData( fontResource.readAll() );
loaded = ( fontID != -1 );
fontsLoaded = ( fontsLoaded || loaded );
}
QgsDebugMsg( QString( "Test font '%1' %2 from testdata.qrc" )
.arg( familyStyle ).arg( loaded ? "loaded" : "FAILED to load" ) );
}
}
}
return fontsLoaded;
}
QFont QgsFontUtils::getStandardTestFont( const QString& style, int pointsize )
{
QFontDatabase fontDB;
if ( ! fontFamilyHasStyle( standardTestFontFamily(), style ) )
{
loadStandardTestFonts( QStringList() << style );
}
QFont f = fontDB.font( standardTestFontFamily(), style, pointsize );
// in case above statement fails to set style
f.setBold( style.contains( "Bold" ) );
f.setItalic( style.contains( "Oblique" ) );
return f;
}