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<title>A simple demonstration of QFont member functions</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>A simple demonstration of QFont member functions</h1>
<p>
<p> This example demonstrates the use of various
<a href="qfont.html">QFont</a> member functions.
<p> <hr>
<p> The main window API (viewer.h):
<p> <pre>/* $Id: qt/viewer.h 3.3.8 edited May 27 2003 $ */
#ifndef VIEWER_H
#define VIEWER_H
#include <<a href="qwidget-h.html">qwidget.h</a>>
#include <<a href="qfont-h.html">qfont.h</a>>
class QTextView;
class QPushButton;
class Viewer : public <a href="qwidget.html">QWidget</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
Viewer();
private slots:
void setDefault();
void setSansSerif();
void setItalics();
private:
void setFontSubstitutions();
void layout();
void showFontInfo( <a href="qfont.html">QFont</a> & );
<a href="qtextview.html">QTextView</a> * greetings;
<a href="qtextview.html">QTextView</a> * fontInfo;
<a href="qpushbutton.html">QPushButton</a> * defaultButton;
<a href="qpushbutton.html">QPushButton</a> * sansSerifButton;
<a href="qpushbutton.html">QPushButton</a> * italicsButton;
};
#endif
</pre>
<p> <hr>
<p> The main window implementation (viewer.cpp):
<p> <pre>/* $Id: qt/viewer.cpp 3.3.8 edited May 27 2003 $ */
#include "viewer.h"
#include <<a href="qstring-h.html">qstring.h</a>>
#include <<a href="qstringlist-h.html">qstringlist.h</a>>
#include <<a href="qtextview-h.html">qtextview.h</a>>
#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
#include <<a href="qlayout-h.html">qlayout.h</a>>
<a name="f590"></a>Viewer::Viewer()
:<a href="qwidget.html">QWidget</a>()
{
setFontSubstitutions();
<a name="x2850"></a> <a href="qstring.html">QString</a> greeting_heb = QString::<a href="qstring.html#fromUtf8">fromUtf8</a>( "\327\251\327\234\327\225\327\235" );
<a href="qstring.html">QString</a> greeting_ru = QString::<a href="qstring.html#fromUtf8">fromUtf8</a>( "\320\227\320\264\321\200\320\260\320\262\321\201\321\202\320\262\321\203\320\271\321\202\320\265" );
<a href="qstring.html">QString</a> greeting_en( "Hello" );
greetings = new <a href="qtextview.html">QTextView</a>( this, "textview" );
greetings-><a href="qtextedit.html#setText">setText</a>( greeting_en + "\n" +
greeting_ru + "\n" +
greeting_heb );
fontInfo = new <a href="qtextview.html">QTextView</a>( this, "fontinfo" );
setDefault();
defaultButton = new <a href="qpushbutton.html">QPushButton</a>( "Default", this,
"pushbutton1" );
<a name="x2860"></a> defaultButton-><a href="qwidget.html#setFont">setFont</a>( QFont( "times" ) );
<a href="qobject.html#connect">connect</a>( defaultButton, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ),
this, SLOT( setDefault() ) );
sansSerifButton = new <a href="qpushbutton.html">QPushButton</a>( "Sans Serif", this,
"pushbutton2" );
sansSerifButton-><a href="qwidget.html#setFont">setFont</a>( QFont( "Helvetica", 12 ) );
<a href="qobject.html#connect">connect</a>( sansSerifButton, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ),
this, SLOT( setSansSerif() ) );
italicsButton = new <a href="qpushbutton.html">QPushButton</a>( "Italics", this,
"pushbutton3" );
italicsButton-><a href="qwidget.html#setFont">setFont</a>( QFont( "lucida", 12, QFont::Bold, TRUE ) );
<a href="qobject.html#connect">connect</a>( italicsButton, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ),
this, SLOT( setItalics() ) );
<a href="qwidget.html#layout">layout</a>();
}
void <a name="f591"></a>Viewer::setDefault()
{
<a href="qfont.html">QFont</a> font( "Bavaria" );
<a name="x2843"></a> font.<a href="qfont.html#setPointSize">setPointSize</a>( 24 );
<a name="x2846"></a> font.<a href="qfont.html#setWeight">setWeight</a>( QFont::Bold );
<a name="x2845"></a> font.<a href="qfont.html#setUnderline">setUnderline</a>( TRUE );
greetings-><a href="qwidget.html#setFont">setFont</a>( font );
showFontInfo( font );
}
void <a name="f592"></a>Viewer::setSansSerif()
{
<a href="qfont.html">QFont</a> font( "Newyork", 18 );
<a name="x2844"></a> font.<a href="qfont.html#setStyleHint">setStyleHint</a>( QFont::SansSerif );
greetings-><a href="qwidget.html#setFont">setFont</a>( font );
showFontInfo( font );
}
void <a name="f593"></a>Viewer::setItalics()
{
<a href="qfont.html">QFont</a> font( "Tokyo" );
font.<a href="qfont.html#setPointSize">setPointSize</a>( 32 );
font.<a href="qfont.html#setWeight">setWeight</a>( QFont::Bold );
<a name="x2842"></a> font.<a href="qfont.html#setItalic">setItalic</a>( TRUE );
greetings-><a href="qwidget.html#setFont">setFont</a>( font );
showFontInfo( font );
}
void <a name="f594"></a>Viewer::showFontInfo( <a href="qfont.html">QFont</a> & font )
{
<a href="qfontinfo.html">QFontInfo</a> info( font );
<a href="qstring.html">QString</a> messageText;
messageText = "Font requested: \"" +
<a name="x2838"></a> font.<a href="qfont.html#family">family</a>() + "\" " +
<a name="x2851"></a><a name="x2841"></a> QString::<a href="qstring.html#number">number</a>( font.<a href="qfont.html#pointSize">pointSize</a>() ) + "pt<BR>" +
"Font used: \"" +
<a name="x2848"></a> info.<a href="qfontinfo.html#family">family</a>() + "\" " +
<a name="x2849"></a> QString::<a href="qstring.html#number">number</a>( info.<a href="qfontinfo.html#pointSize">pointSize</a>() ) + "pt<P>";
<a name="x2847"></a> <a href="qstringlist.html">QStringList</a> substitutions = QFont::<a href="qfont.html#substitutes">substitutes</a>( font.<a href="qfont.html#family">family</a>() );
<a name="x2856"></a> if ( ! substitutions.<a href="qvaluelist.html#isEmpty">isEmpty</a>() ){
messageText += "The following substitutions exist for " + \
font.<a href="qfont.html#family">family</a>() + ":<UL>";
QStringList::Iterator i = substitutions.<a href="qvaluelist.html#begin">begin</a>();
while ( i != substitutions.<a href="qvaluelist.html#end">end</a>() ){
messageText += "<LI>\"" + (* i) + "\"";
i++;
}
messageText += "</UL>";
} else {
messageText += "No substitutions exist for " + \
font.<a href="qfont.html#family">family</a>() + ".";
}
fontInfo-><a href="qtextedit.html#setText">setText</a>( messageText );
}
void <a name="f595"></a>Viewer::setFontSubstitutions()
{
<a href="qstringlist.html">QStringList</a> substitutes;
<a name="x2853"></a> substitutes.<a href="qvaluelist.html#append">append</a>( "Times" );
substitutes += "Mincho",
substitutes << "Arabic Newspaper" << "crox";
<a name="x2840"></a> QFont::<a href="qfont.html#insertSubstitutions">insertSubstitutions</a>( "Bavaria", substitutes );
<a name="x2839"></a> QFont::<a href="qfont.html#insertSubstitution">insertSubstitution</a>( "Tokyo", "Lucida" );
}
// For those who prefer to use Qt Designer for creating GUIs
// the following function might not be of particular interest:
// all it does is creating the widget layout.
<a name="x2858"></a>void Viewer::<a href="qwidget.html#layout">layout</a>()
{
<a href="qhboxlayout.html">QHBoxLayout</a> * textViewContainer = new <a href="qhboxlayout.html">QHBoxLayout</a>();
textViewContainer-><a href="qboxlayout.html#addWidget">addWidget</a>( greetings );
textViewContainer-><a href="qboxlayout.html#addWidget">addWidget</a>( fontInfo );
<a href="qhboxlayout.html">QHBoxLayout</a> * buttonContainer = new <a href="qhboxlayout.html">QHBoxLayout</a>();
buttonContainer-><a href="qboxlayout.html#addWidget">addWidget</a>( defaultButton );
buttonContainer-><a href="qboxlayout.html#addWidget">addWidget</a>( sansSerifButton );
buttonContainer-><a href="qboxlayout.html#addWidget">addWidget</a>( italicsButton );
<a name="x2857"></a> int maxButtonHeight = defaultButton-><a href="qwidget.html#height">height</a>();
if ( sansSerifButton-><a href="qwidget.html#height">height</a>() > maxButtonHeight )
maxButtonHeight = sansSerifButton-><a href="qwidget.html#height">height</a>();
if ( italicsButton-><a href="qwidget.html#height">height</a>() > maxButtonHeight )
maxButtonHeight = italicsButton-><a href="qwidget.html#height">height</a>();
<a name="x2859"></a> defaultButton-><a href="qwidget.html#setFixedHeight">setFixedHeight</a>( maxButtonHeight );
sansSerifButton-><a href="qwidget.html#setFixedHeight">setFixedHeight</a>( maxButtonHeight );
italicsButton-><a href="qwidget.html#setFixedHeight">setFixedHeight</a>( maxButtonHeight );
<a href="qvboxlayout.html">QVBoxLayout</a> * container = new <a href="qvboxlayout.html">QVBoxLayout</a>( this );
<a name="x2835"></a> container-><a href="qboxlayout.html#addLayout">addLayout</a>( textViewContainer );
container-><a href="qboxlayout.html#addLayout">addLayout</a>( buttonContainer );
<a href="qwidget.html#resize">resize</a>( 700, 250 );
}
</pre>
<p> <hr>
<p> main() program (simple-qfont-demo.cpp):
<p> <pre>/* $Id: qt/simple-qfont-demo.cpp 3.3.8 edited May 27 2003 $ */
#include "viewer.h"
#include <<a href="qapplication-h.html">qapplication.h</a>>
int main( int argc, char **argv )
{
<a href="qapplication.html">QApplication</a> app( argc, argv );
Viewer * textViewer = new Viewer();
textViewer-><a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Simple QFont Demo" );
app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( textViewer );
textViewer-><a href="qwidget.html#show">show</a>();
return app.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p> <p>See also <a href="qfont-examples.html">QFont Examples</a>.
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