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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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Qt Toolkit - dclock/main.cpp example file
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<h1 align=center>Digital Clock</h1><br clear="all">
This example displays a digital LCD clock and can switch between time
and date.
<hr>
Header file: <pre>/****************************************************************************
** $Id: qt/examples/dclock/dclock.h 2.3.2 edited 2001-01-26 $
**
** Copyright (C) 1992-2000 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 QLCDNumber // digital clock widget
{
Q_OBJECT
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>
<hr>
Implementation: <pre>/****************************************************************************
** $Id: qt/examples/dclock/dclock.cpp 2.3.2 edited 2001-01-26 $
**
** Copyright (C) 1992-2000 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.
//
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#558f79">setFrameStyle</a>( QFrame::Panel | QFrame::Raised );
<a href="qframe.html#b76184">setLineWidth</a>( 2 ); // set frame line width
<a href=#128>showTime</a>(); // display the current time
normalTimer = startTimer( 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.
//
void <a name="124"></a>DigitalClock::timerEvent( <a href="qtimerevent.html">QTimerEvent</a> *e )
{
if ( e->timerId() == showDateTimer ) // stop showing date
<a href=#127>stopDate</a>();
else { // normal timer
if ( showDateTimer == -1 ) // not showing date
<a href=#128>showTime</a>();
}
}
//
// Enters date mode when the left mouse button is pressed.
//
void <a name="125"></a>DigitalClock::mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
if ( e-><a href="qmouseevent.html#78482f">button</a>() == QMouseEvent::LeftButton ) // left button pressed
<a href=#126>showDate</a>();
}
//
// Shows the current date in the internal lcd widget.
// Fires a timer to stop showing the date.
//
void <a name="126"></a>DigitalClock::showDate()
{
if ( showDateTimer != -1 ) // already showing date
return;
<a href="qdate.html">QDate</a> date = QDate::currentDate();
<a href="qstring.html">QString</a> s;
s.<a href="qstring.html#926f67">sprintf</a>( "%2d %2d", date.<a href="qdate.html#73a46c">month</a>(), date.<a href="qdate.html#ff0275">day</a>() );
<a href="qlcdnumber.html#ecdf88">display</a>( s ); // sets the LCD number/text
showDateTimer = startTimer( 2000 ); // keep this state for 2 secs
}
//
// Stops showing the date.
//
void <a name="127"></a>DigitalClock::stopDate()
{
<a href="qobject.html#46d1c6">killTimer</a>( showDateTimer );
showDateTimer = -1;
<a href=#128>showTime</a>();
}
//
// Shows the current time in the internal lcd widget.
//
void <a name="128"></a>DigitalClock::showTime()
{
showingColon = !showingColon; // toggle/blink colon
<a href="qstring.html">QString</a> s = QTime::currentTime().toString().left(5);
if ( !showingColon )
s[2] = ' ';
if ( s[0] == '0' )
s[0] = ' ';
<a href="qlcdnumber.html#ecdf88">display</a>( s ); // set LCD number/text
}
</pre>
<hr>
Main:
<pre>/****************************************************************************
** $Id: qt/examples/dclock/main.cpp 2.3.2 edited 2001-06-12 $
**
** Copyright (C) 1992-2000 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 name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>
int main( int argc, char **argv )
{
<a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv );
DigitalClock *clock = new DigitalClock;
clock-><a name="resize"></a><a href="qwidget.html#ff9d07">resize</a>( 170, 80 );
a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>( clock );
clock-><a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>("Qt Example - Digital Clock");
clock-><a name="show"></a><a href="qwidget.html#200ee5">show</a>();
return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
}
</pre>
<p><address><hr><div align="center">
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<td>Copyright 2001 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.2</div>
</table></div></address></body></html>
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