<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/hello/hello.doc:5 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Hello, World</title> <style type="text/css"><!-- 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>Hello, World</h1> <p> This example brings up the words "Hello, World" moving up and down, and in different colors. <p> <hr> <p> Header file: <p> <pre>/**************************************************************************** ** $Id: qt/hello.h 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for TQt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #ifndef HELLO_H #define HELLO_H #include <<a href="qwidget-h.html">ntqwidget.h</a>> class Hello : public <a href="ntqwidget.html">TQWidget</a> { <a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a> public: Hello( const char *text, TQWidget *parent=0, const char *name=0 ); signals: void clicked(); protected: void mouseReleaseEvent( <a href="qmouseevent.html">TQMouseEvent</a> * ); void paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> * ); private slots: void animate(); private: <a href="ntqstring.html">TQString</a> t; int b; }; #endif </pre> <p> <hr> <p> Implementation: <p> <pre>/**************************************************************************** ** $Id: qt/hello.cpp 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for TQt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include "hello.h" #include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>> #include <<a href="qtimer-h.html">ntqtimer.h</a>> #include <<a href="qpainter-h.html">ntqpainter.h</a>> #include <<a href="qpixmap-h.html">ntqpixmap.h</a>> /* Constructs a Hello widget. Starts a 40 ms animation timer. */ <a name="f473"></a>Hello::Hello( const char *text, TQWidget *parent, const char *name ) : <a href="ntqwidget.html">TQWidget</a>(parent,name), t(text), b(0) { <a href="ntqtimer.html">TQTimer</a> *timer = new <a href="ntqtimer.html">TQTimer</a>(this); <a name="x1640"></a> <a href="ntqobject.html#connect">connect</a>( timer, TQ_SIGNAL(<a href="ntqtimer.html#timeout">timeout</a>()), TQ_SLOT(animate()) ); <a name="x1639"></a> timer-><a href="ntqtimer.html#start">start</a>( 40 ); <a href="ntqwidget.html#resize">resize</a>( 260, 130 ); } /* This private slot is called each time the timer fires. */ void <a name="f474"></a>Hello::animate() { b = (b + 1) & 15; <a href="ntqwidget.html#repaint">repaint</a>( FALSE ); } /* Handles mouse button release events for the Hello widget. We emit the clicked() signal when the mouse is released inside the widget. */ <a name="x1641"></a>void Hello::<a href="ntqwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e ) { if ( <a href="ntqwidget.html#rect">rect</a>().contains( e-><a href="qmouseevent.html#pos">pos</a>() ) ) emit clicked(); } /* Handles paint events for the Hello widget. Flicker-free update. The text is first drawn in the pixmap and the pixmap is then blt'ed to the screen. */ void Hello::<a href="ntqwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> * ) { static int sin_tbl[16] = { 0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38}; if ( t.isEmpty() ) return; // 1: Compute some sizes, positions etc. <a href="ntqfontmetrics.html">TQFontMetrics</a> fm = <a href="ntqwidget.html#fontMetrics">fontMetrics</a>(); <a name="x1631"></a> int w = fm.<a href="ntqfontmetrics.html#width">width</a>(t) + 20; <a name="x1630"></a> int h = fm.<a href="ntqfontmetrics.html#height">height</a>() * 2; int pmx = <a href="ntqwidget.html#width">width</a>()/2 - w/2; int pmy = <a href="ntqwidget.html#height">height</a>()/2 - h/2; // 2: Create the pixmap and fill it with the widget's background <a href="ntqpixmap.html">TQPixmap</a> pm( w, h ); <a name="x1638"></a> pm.<a href="ntqpixmap.html#fill">fill</a>( this, pmx, pmy ); // 3: Paint the pixmap. Cool wave effect <a href="ntqpainter.html">TQPainter</a> p; int x = 10; <a name="x1629"></a> int y = h/2 + fm.<a href="ntqfontmetrics.html#descent">descent</a>(); int i = 0; <a name="x1633"></a> p.<a href="ntqpainter.html#begin">begin</a>( &pm ); <a name="x1636"></a> p.<a href="ntqpainter.html#setFont">setFont</a>( <a href="ntqwidget.html#font">font</a>() ); while ( !t[i].isNull() ) { int i16 = (b+i) & 15; p.<a href="ntqpainter.html#setPen">setPen</a>( TQColor((15-i16)*16,255,255,TQColor::Hsv) ); p.<a href="ntqpainter.html#drawText">drawText</a>( x, y-sin_tbl[i16]*h/800, t.mid(i,1), 1 ); x += fm.<a href="ntqfontmetrics.html#width">width</a>( t[i] ); i++; } <a name="x1635"></a> p.<a href="ntqpainter.html#end">end</a>(); // 4: Copy the pixmap to the Hello widget <a href="ntqimage.html#bitBlt">bitBlt</a>( this, pmx, pmy, &pm ); } </pre> <p> <hr> <p> Main: <p> <pre>/**************************************************************************** ** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for TQt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include "hello.h" #include <<a href="qapplication-h.html">ntqapplication.h</a>> /* The program starts here. It parses the command line and builds a message string to be displayed by the Hello widget. */ int main( int argc, char **argv ) { <a href="ntqapplication.html">TQApplication</a> a(argc,argv); <a href="ntqstring.html">TQString</a> s; for ( int i=1; i<argc; i++ ) { s += argv[i]; if ( i<argc-1 ) s += " "; } if ( s.<a href="ntqstring.html#isEmpty">isEmpty</a>() ) s = "Hello, World"; Hello h( s ); #ifndef TQT_NO_WIDGET_TOPEXTRA // for TQt/Embedded minimal build h.<a href="ntqwidget.html#setCaption">setCaption</a>( "TQt says hello" ); #endif TQObject::<a href="ntqobject.html#connect">connect</a>( &h, TQ_SIGNAL(clicked()), &a, TQ_SLOT(<a href="ntqapplication.html#quit">quit</a>()) ); <a name="x1650"></a> h.<a href="ntqwidget.html#setFont">setFont</a>( TQFont("times",32,TQFont::Bold) ); // default font <a name="x1648"></a> h.<a href="ntqwidget.html#setBackgroundColor">setBackgroundColor</a>( TQt::white ); // default bg color a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &h ); h.<a href="ntqwidget.html#show">show</a>(); return a.<a href="ntqapplication.html#exec">exec</a>(); } </pre> <p>See also <a href="examples.html">Examples</a>. <!-- eof --> <p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <td>Copyright © 2007 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>TQt 3.3.8</div> </table></div></address></body> </html>