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274 lines
12 KiB
274 lines
12 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/fonts/simple-qfont-demo/simple-qfont-demo.doc:1 -->
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<title>A simple demonstration of QFont member functions</title>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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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>
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<p>
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<p> This example demonstrates the use of various
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<a href="qfont.html">QFont</a> member functions.
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<p> <hr>
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<p> The main window API (viewer.h):
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<p> <pre>/* $Id: qt/viewer.h 3.3.8 edited May 27 2003 $ */
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#ifndef VIEWER_H
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#define VIEWER_H
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#include <<a href="qwidget-h.html">qwidget.h</a>>
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#include <<a href="qfont-h.html">qfont.h</a>>
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class QTextView;
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class QPushButton;
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class Viewer : public <a href="qwidget.html">QWidget</a>
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{
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<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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public:
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Viewer();
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private slots:
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void setDefault();
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void setSansSerif();
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void setItalics();
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private:
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void setFontSubstitutions();
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void layout();
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void showFontInfo( <a href="qfont.html">QFont</a> & );
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<a href="qtextview.html">QTextView</a> * greetings;
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<a href="qtextview.html">QTextView</a> * fontInfo;
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<a href="qpushbutton.html">QPushButton</a> * defaultButton;
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<a href="qpushbutton.html">QPushButton</a> * sansSerifButton;
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<a href="qpushbutton.html">QPushButton</a> * italicsButton;
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};
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#endif
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</pre>
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<p> <hr>
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<p> The main window implementation (viewer.cpp):
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<p> <pre>/* $Id: qt/viewer.cpp 3.3.8 edited May 27 2003 $ */
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#include "viewer.h"
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#include <<a href="qstring-h.html">qstring.h</a>>
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#include <<a href="qstringlist-h.html">qstringlist.h</a>>
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#include <<a href="qtextview-h.html">qtextview.h</a>>
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#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
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#include <<a href="qlayout-h.html">qlayout.h</a>>
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<a name="f590"></a>Viewer::Viewer()
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:<a href="qwidget.html">QWidget</a>()
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{
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setFontSubstitutions();
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<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" );
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<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" );
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<a href="qstring.html">QString</a> greeting_en( "Hello" );
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greetings = new <a href="qtextview.html">QTextView</a>( this, "textview" );
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greetings-><a href="qtextedit.html#setText">setText</a>( greeting_en + "\n" +
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greeting_ru + "\n" +
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greeting_heb );
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fontInfo = new <a href="qtextview.html">QTextView</a>( this, "fontinfo" );
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setDefault();
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defaultButton = new <a href="qpushbutton.html">QPushButton</a>( "Default", this,
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"pushbutton1" );
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<a name="x2860"></a> defaultButton-><a href="qwidget.html#setFont">setFont</a>( QFont( "times" ) );
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<a href="qobject.html#connect">connect</a>( defaultButton, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ),
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this, SLOT( setDefault() ) );
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sansSerifButton = new <a href="qpushbutton.html">QPushButton</a>( "Sans Serif", this,
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"pushbutton2" );
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sansSerifButton-><a href="qwidget.html#setFont">setFont</a>( QFont( "Helvetica", 12 ) );
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<a href="qobject.html#connect">connect</a>( sansSerifButton, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ),
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this, SLOT( setSansSerif() ) );
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italicsButton = new <a href="qpushbutton.html">QPushButton</a>( "Italics", this,
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"pushbutton3" );
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italicsButton-><a href="qwidget.html#setFont">setFont</a>( QFont( "lucida", 12, QFont::Bold, TRUE ) );
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<a href="qobject.html#connect">connect</a>( italicsButton, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ),
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this, SLOT( setItalics() ) );
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<a href="qwidget.html#layout">layout</a>();
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}
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void <a name="f591"></a>Viewer::setDefault()
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{
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<a href="qfont.html">QFont</a> font( "Bavaria" );
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<a name="x2843"></a> font.<a href="qfont.html#setPointSize">setPointSize</a>( 24 );
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<a name="x2846"></a> font.<a href="qfont.html#setWeight">setWeight</a>( QFont::Bold );
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<a name="x2845"></a> font.<a href="qfont.html#setUnderline">setUnderline</a>( TRUE );
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greetings-><a href="qwidget.html#setFont">setFont</a>( font );
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showFontInfo( font );
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}
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void <a name="f592"></a>Viewer::setSansSerif()
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{
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<a href="qfont.html">QFont</a> font( "Newyork", 18 );
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<a name="x2844"></a> font.<a href="qfont.html#setStyleHint">setStyleHint</a>( QFont::SansSerif );
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greetings-><a href="qwidget.html#setFont">setFont</a>( font );
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showFontInfo( font );
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}
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void <a name="f593"></a>Viewer::setItalics()
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{
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<a href="qfont.html">QFont</a> font( "Tokyo" );
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font.<a href="qfont.html#setPointSize">setPointSize</a>( 32 );
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font.<a href="qfont.html#setWeight">setWeight</a>( QFont::Bold );
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<a name="x2842"></a> font.<a href="qfont.html#setItalic">setItalic</a>( TRUE );
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greetings-><a href="qwidget.html#setFont">setFont</a>( font );
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showFontInfo( font );
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}
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void <a name="f594"></a>Viewer::showFontInfo( <a href="qfont.html">QFont</a> & font )
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{
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<a href="qfontinfo.html">QFontInfo</a> info( font );
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<a href="qstring.html">QString</a> messageText;
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messageText = "Font requested: \"" +
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<a name="x2838"></a> font.<a href="qfont.html#family">family</a>() + "\" " +
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<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>" +
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"Font used: \"" +
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<a name="x2848"></a> info.<a href="qfontinfo.html#family">family</a>() + "\" " +
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<a name="x2849"></a> QString::<a href="qstring.html#number">number</a>( info.<a href="qfontinfo.html#pointSize">pointSize</a>() ) + "pt<P>";
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<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>() );
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<a name="x2856"></a> if ( ! substitutions.<a href="qvaluelist.html#isEmpty">isEmpty</a>() ){
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messageText += "The following substitutions exist for " + \
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font.<a href="qfont.html#family">family</a>() + ":<UL>";
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QStringList::Iterator i = substitutions.<a href="qvaluelist.html#begin">begin</a>();
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while ( i != substitutions.<a href="qvaluelist.html#end">end</a>() ){
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messageText += "<LI>\"" + (* i) + "\"";
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i++;
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}
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messageText += "</UL>";
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} else {
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messageText += "No substitutions exist for " + \
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font.<a href="qfont.html#family">family</a>() + ".";
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}
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fontInfo-><a href="qtextedit.html#setText">setText</a>( messageText );
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}
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void <a name="f595"></a>Viewer::setFontSubstitutions()
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{
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<a href="qstringlist.html">QStringList</a> substitutes;
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<a name="x2853"></a> substitutes.<a href="qvaluelist.html#append">append</a>( "Times" );
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substitutes += "Mincho",
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substitutes << "Arabic Newspaper" << "crox";
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<a name="x2840"></a> QFont::<a href="qfont.html#insertSubstitutions">insertSubstitutions</a>( "Bavaria", substitutes );
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<a name="x2839"></a> QFont::<a href="qfont.html#insertSubstitution">insertSubstitution</a>( "Tokyo", "Lucida" );
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}
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// For those who prefer to use Qt Designer for creating GUIs
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// the following function might not be of particular interest:
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// all it does is creating the widget layout.
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<a name="x2858"></a>void Viewer::<a href="qwidget.html#layout">layout</a>()
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{
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<a href="qhboxlayout.html">QHBoxLayout</a> * textViewContainer = new <a href="qhboxlayout.html">QHBoxLayout</a>();
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textViewContainer-><a href="qboxlayout.html#addWidget">addWidget</a>( greetings );
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textViewContainer-><a href="qboxlayout.html#addWidget">addWidget</a>( fontInfo );
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<a href="qhboxlayout.html">QHBoxLayout</a> * buttonContainer = new <a href="qhboxlayout.html">QHBoxLayout</a>();
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buttonContainer-><a href="qboxlayout.html#addWidget">addWidget</a>( defaultButton );
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buttonContainer-><a href="qboxlayout.html#addWidget">addWidget</a>( sansSerifButton );
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buttonContainer-><a href="qboxlayout.html#addWidget">addWidget</a>( italicsButton );
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<a name="x2857"></a> int maxButtonHeight = defaultButton-><a href="qwidget.html#height">height</a>();
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if ( sansSerifButton-><a href="qwidget.html#height">height</a>() > maxButtonHeight )
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maxButtonHeight = sansSerifButton-><a href="qwidget.html#height">height</a>();
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if ( italicsButton-><a href="qwidget.html#height">height</a>() > maxButtonHeight )
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maxButtonHeight = italicsButton-><a href="qwidget.html#height">height</a>();
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<a name="x2859"></a> defaultButton-><a href="qwidget.html#setFixedHeight">setFixedHeight</a>( maxButtonHeight );
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sansSerifButton-><a href="qwidget.html#setFixedHeight">setFixedHeight</a>( maxButtonHeight );
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italicsButton-><a href="qwidget.html#setFixedHeight">setFixedHeight</a>( maxButtonHeight );
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<a href="qvboxlayout.html">QVBoxLayout</a> * container = new <a href="qvboxlayout.html">QVBoxLayout</a>( this );
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<a name="x2835"></a> container-><a href="qboxlayout.html#addLayout">addLayout</a>( textViewContainer );
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container-><a href="qboxlayout.html#addLayout">addLayout</a>( buttonContainer );
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<a href="qwidget.html#resize">resize</a>( 700, 250 );
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}
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</pre>
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<p> <hr>
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<p> main() program (simple-qfont-demo.cpp):
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<p> <pre>/* $Id: qt/simple-qfont-demo.cpp 3.3.8 edited May 27 2003 $ */
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#include "viewer.h"
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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int main( int argc, char **argv )
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{
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<a href="qapplication.html">QApplication</a> app( argc, argv );
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Viewer * textViewer = new Viewer();
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textViewer-><a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Simple QFont Demo" );
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app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( textViewer );
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textViewer-><a href="qwidget.html#show">show</a>();
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return app.<a href="qapplication.html#exec">exec</a>();
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}
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</pre>
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<p> <p>See also <a href="qfont-examples.html">QFont Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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