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237 lines
8.3 KiB
237 lines
8.3 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/hello/hello.doc:5 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Hello, World</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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| <a href="annotated.html">
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<font color="#004faf">Annotated</font></a>
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| <a href="groups.html">
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<font color="#004faf">Grouped Classes</font></a>
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| <a href="functions.html">
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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>Hello, World</h1>
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<p>
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This example brings up the words "Hello, World" moving up and down,
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and in different colors.
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<p> <hr>
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<p> Header file:
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<p> <pre>/****************************************************************************
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** $Id: qt/hello.h 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#ifndef HELLO_H
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#define HELLO_H
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#include <<a href="qwidget-h.html">qwidget.h</a>>
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class Hello : 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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Hello( const char *text, QWidget *parent=0, const char *name=0 );
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signals:
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void clicked();
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protected:
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void mouseReleaseEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
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void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
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private slots:
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void animate();
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private:
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<a href="qstring.html">QString</a> t;
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int b;
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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> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/hello.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "hello.h"
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#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
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#include <<a href="qtimer-h.html">qtimer.h</a>>
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#include <<a href="qpainter-h.html">qpainter.h</a>>
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#include <<a href="qpixmap-h.html">qpixmap.h</a>>
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/*
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Constructs a Hello widget. Starts a 40 ms animation timer.
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*/
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<a name="f473"></a>Hello::Hello( const char *text, QWidget *parent, const char *name )
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: <a href="qwidget.html">QWidget</a>(parent,name), t(text), b(0)
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{
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<a href="qtimer.html">QTimer</a> *timer = new <a href="qtimer.html">QTimer</a>(this);
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<a name="x1640"></a> <a href="qobject.html#connect">connect</a>( timer, SIGNAL(<a href="qtimer.html#timeout">timeout</a>()), SLOT(animate()) );
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<a name="x1639"></a> timer-><a href="qtimer.html#start">start</a>( 40 );
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<a href="qwidget.html#resize">resize</a>( 260, 130 );
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}
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/*
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This private slot is called each time the timer fires.
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*/
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void <a name="f474"></a>Hello::animate()
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{
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b = (b + 1) & 15;
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<a href="qwidget.html#repaint">repaint</a>( FALSE );
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}
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/*
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Handles mouse button release events for the Hello widget.
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We emit the clicked() signal when the mouse is released inside
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the widget.
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*/
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<a name="x1641"></a>void Hello::<a href="qwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
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{
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if ( <a href="qwidget.html#rect">rect</a>().contains( e-><a href="qmouseevent.html#pos">pos</a>() ) )
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emit clicked();
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}
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/*
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Handles paint events for the Hello widget.
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Flicker-free update. The text is first drawn in the pixmap and the
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pixmap is then blt'ed to the screen.
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*/
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void Hello::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
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{
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static int sin_tbl[16] = {
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0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38};
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if ( t.isEmpty() )
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return;
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// 1: Compute some sizes, positions etc.
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<a href="qfontmetrics.html">QFontMetrics</a> fm = <a href="qwidget.html#fontMetrics">fontMetrics</a>();
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<a name="x1631"></a> int w = fm.<a href="qfontmetrics.html#width">width</a>(t) + 20;
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<a name="x1630"></a> int h = fm.<a href="qfontmetrics.html#height">height</a>() * 2;
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int pmx = <a href="qwidget.html#width">width</a>()/2 - w/2;
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int pmy = <a href="qwidget.html#height">height</a>()/2 - h/2;
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// 2: Create the pixmap and fill it with the widget's background
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<a href="qpixmap.html">QPixmap</a> pm( w, h );
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<a name="x1638"></a> pm.<a href="qpixmap.html#fill">fill</a>( this, pmx, pmy );
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// 3: Paint the pixmap. Cool wave effect
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<a href="qpainter.html">QPainter</a> p;
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int x = 10;
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<a name="x1629"></a> int y = h/2 + fm.<a href="qfontmetrics.html#descent">descent</a>();
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int i = 0;
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<a name="x1633"></a> p.<a href="qpainter.html#begin">begin</a>( &pm );
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<a name="x1636"></a> p.<a href="qpainter.html#setFont">setFont</a>( <a href="qwidget.html#font">font</a>() );
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while ( !t[i].isNull() ) {
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int i16 = (b+i) & 15;
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p.<a href="qpainter.html#setPen">setPen</a>( QColor((15-i16)*16,255,255,QColor::Hsv) );
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p.<a href="qpainter.html#drawText">drawText</a>( x, y-sin_tbl[i16]*h/800, t.mid(i,1), 1 );
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x += fm.<a href="qfontmetrics.html#width">width</a>( t[i] );
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i++;
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}
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<a name="x1635"></a> p.<a href="qpainter.html#end">end</a>();
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// 4: Copy the pixmap to the Hello widget
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<a href="qimage.html#bitBlt">bitBlt</a>( this, pmx, pmy, &pm );
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}
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</pre>
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<p> <hr>
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<p> Main:
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<p> <pre>/****************************************************************************
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** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "hello.h"
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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/*
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The program starts here. It parses the command line and builds a message
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string to be displayed by the Hello widget.
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*/
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int main( int argc, char **argv )
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{
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<a href="qapplication.html">QApplication</a> a(argc,argv);
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<a href="qstring.html">QString</a> s;
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for ( int i=1; i<argc; i++ ) {
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s += argv[i];
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if ( i<argc-1 )
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s += " ";
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}
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if ( s.<a href="qstring.html#isEmpty">isEmpty</a>() )
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s = "Hello, World";
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Hello h( s );
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#ifndef QT_NO_WIDGET_TOPEXTRA // for Qt/Embedded minimal build
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h.<a href="qwidget.html#setCaption">setCaption</a>( "Qt says hello" );
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#endif
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QObject::<a href="qobject.html#connect">connect</a>( &h, SIGNAL(clicked()), &a, SLOT(<a href="qapplication.html#quit">quit</a>()) );
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<a name="x1650"></a> h.<a href="qwidget.html#setFont">setFont</a>( QFont("times",32,QFont::Bold) ); // default font
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<a name="x1648"></a> h.<a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( Qt::white ); // default bg color
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a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &h );
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h.<a href="qwidget.html#show">show</a>();
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return a.<a href="qapplication.html#exec">exec</a>();
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}
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</pre>
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<p>See also <a href="examples.html">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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