<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.6-espenr-14571/qt-x11-free-3.3.6/examples/dclock/dclock.doc:4 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Digital Clock</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>Digital Clock</h1> <p> This example displays a digital LCD clock that can switch between time and date. <p> <hr> <p> Header file: <p> <pre>/**************************************************************************** ** $Id: qt/dclock.h 3.3.6 edited Aug 31 2005 $ ** ** Copyright (C) 1992-2005 Trolltech AS. All rights reserved. ** ** This file is part of an example program for Qt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #ifndef DCLOCK_H #define DCLOCK_H #include <<a href="qlcdnumber-h.html">qlcdnumber.h</a>> class DigitalClock : public <a href="qlcdnumber.html">QLCDNumber</a> // digital clock widget { <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a> public: DigitalClock( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 ); protected: // event handlers void timerEvent( <a href="qtimerevent.html">QTimerEvent</a> * ); void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> * ); private slots: // internal slots void stopDate(); void showTime(); private: // internal data void showDate(); bool showingColon; int normalTimer; int showDateTimer; }; #endif // DCLOCK_H </pre> <p> <hr> <p> Implementation: <p> <pre>/**************************************************************************** ** $Id: qt/dclock.cpp 3.3.6 edited Aug 31 2005 $ ** ** Copyright (C) 1992-2005 Trolltech AS. All rights reserved. ** ** This file is part of an example program for Qt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include "dclock.h" #include <<a href="qdatetime-h.html">qdatetime.h</a>> // // Constructs a DigitalClock widget with a parent and a name. // <a name="f340"></a>DigitalClock::DigitalClock( <a href="qwidget.html">QWidget</a> *parent, const char *name ) : <a href="qlcdnumber.html">QLCDNumber</a>( parent, name ) { showingColon = FALSE; <a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Raised ); <a href="qframe.html#setLineWidth">setLineWidth</a>( 2 ); // set frame line width showTime(); // display the current time normalTimer = <a href="qobject.html#startTimer">startTimer</a>( 500 ); // 1/2 second timer events showDateTimer = -1; // not showing date } // // Handles timer events for the digital clock widget. // There are two different timers; one timer for updating the clock // and another one for switching back from date mode to time mode. // <a name="x919"></a>void DigitalClock::<a href="qobject.html#timerEvent">timerEvent</a>( <a href="qtimerevent.html">QTimerEvent</a> *e ) { <a name="x922"></a> if ( e-><a href="qtimerevent.html#timerId">timerId</a>() == showDateTimer ) // stop showing date stopDate(); else { // normal timer if ( showDateTimer == -1 ) // not showing date showTime(); } } // // Enters date mode when the left mouse button is pressed. // void DigitalClock::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e ) { <a name="x918"></a> if ( e-><a href="qmouseevent.html#button">button</a>() == QMouseEvent::LeftButton ) // left button pressed showDate(); } // // Shows the current date in the internal lcd widget. // Fires a timer to stop showing the date. // void <a name="f341"></a>DigitalClock::showDate() { if ( showDateTimer != -1 ) // already showing date return; <a name="x915"></a> <a href="qdate.html">QDate</a> date = QDate::<a href="qdate.html#currentDate">currentDate</a>(); <a href="qstring.html">QString</a> s; <a name="x920"></a><a name="x917"></a><a name="x916"></a> s.<a href="qstring.html#sprintf">sprintf</a>( "%2d %2d", date.<a href="qdate.html#month">month</a>(), date.<a href="qdate.html#day">day</a>() ); <a href="qlcdnumber.html#display">display</a>( s ); // sets the LCD number/text showDateTimer = <a href="qobject.html#startTimer">startTimer</a>( 2000 ); // keep this state for 2 secs } // // Stops showing the date. // void <a name="f342"></a>DigitalClock::stopDate() { <a href="qobject.html#killTimer">killTimer</a>( showDateTimer ); showDateTimer = -1; showTime(); } // // Shows the current time in the internal lcd widget. // void <a name="f343"></a>DigitalClock::showTime() { showingColon = !showingColon; // toggle/blink colon <a name="x921"></a> <a href="qstring.html">QString</a> s = QTime::<a href="qtime.html#currentTime">currentTime</a>().toString().left(5); if ( !showingColon ) s[2] = ' '; if ( s[0] == '0' ) s[0] = ' '; <a href="qlcdnumber.html#display">display</a>( s ); // set LCD number/text } </pre> <p> <hr> <p> Main: <p> <pre>/**************************************************************************** ** $Id: qt/main.cpp 3.3.6 edited Aug 31 2005 $ ** ** Copyright (C) 1992-2005 Trolltech AS. All rights reserved. ** ** This file is part of an example program for Qt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include "dclock.h" #include <<a href="qapplication-h.html">qapplication.h</a>> int main( int argc, char **argv ) { <a href="qapplication.html">QApplication</a> a( argc, argv ); DigitalClock *clock = new DigitalClock; clock-><a href="qwidget.html#resize">resize</a>( 170, 80 ); a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( clock ); clock-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Digital Clock"); clock-><a href="qwidget.html#show">show</a>(); return a.<a href="qapplication.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 © 2005 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>Qt 3.3.6</div> </table></div></address></body> </html>