simple-font-demo-example.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/examples/fonts/simple-qfont-demo/simple-qfont-demo.doc:5 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>A simple demonstration of QFont member functions</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><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> It is covered in detail by a <a href="simple-qfont-demo-walkthrough.html">walkthrough.</a><p> <hr><p> The main window API (viewer.h):<p> <pre>/* $Id$ */#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>/* $Id$ */#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="f475"></a>Viewer::Viewer() :<a href="qwidget.html">QWidget</a>(){ setFontSubstitutions();<a name="x1678"></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" );<a name="x1681"></a> 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="x1689"></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="f476"></a>Viewer::setDefault(){ <a href="qfont.html">QFont</a> font( "Bavaria" );<a name="x1671"></a> font.<a href="qfont.html#setPointSize">setPointSize</a>( 24 );<a name="x1674"></a> font.<a href="qfont.html#setWeight">setWeight</a>( QFont::Bold );<a name="x1673"></a> font.<a href="qfont.html#setUnderline">setUnderline</a>( TRUE );<a name="x1680"></a> greetings-><a href="qwidget.html#setFont">setFont</a>( font ); showFontInfo( font );}void <a name="f477"></a>Viewer::setSansSerif(){ <a href="qfont.html">QFont</a> font( "Newyork", 18 );<a name="x1672"></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="f478"></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="x1670"></a> font.<a href="qfont.html#setItalic">setItalic</a>( TRUE ); greetings-><a href="qwidget.html#setFont">setFont</a>( font ); showFontInfo( font );}void <a name="f479"></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="x1666"></a> font.<a href="qfont.html#family">family</a>() + "\" " +<a name="x1679"></a><a name="x1669"></a> QString::<a href="qstring.html#number">number</a>( font.<a href="qfont.html#pointSize">pointSize</a>() ) + "pt<BR>" + "Font used: \"" +<a name="x1676"></a> info.<a href="qfontinfo.html#family">family</a>() + "\" " +<a name="x1677"></a> QString::<a href="qstring.html#number">number</a>( info.<a href="qfontinfo.html#pointSize">pointSize</a>() ) + "pt<P>";<a name="x1675"></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="x1685"></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="f480"></a>Viewer::setFontSubstitutions(){ <a href="qstringlist.html">QStringList</a> substitutes;<a name="x1682"></a> substitutes.<a href="qvaluelist.html#append">append</a>( "Times" ); substitutes += "Mincho", substitutes << "Arabic Newspaper" << "crox";<a name="x1668"></a> QFont::<a href="qfont.html#insertSubstitutions">insertSubstitutions</a>( "Bavaria", substitutes );<a name="x1667"></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="x1687"></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="x1686"></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="x1688"></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="x1663"></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>/* $Id$ */#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>.<!-- eof --><p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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