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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>Digital Clock</title>
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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>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 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. 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 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. 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="f371"></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="x1102"></a>void DigitalClock::<a href="qobject.html#timerEvent">timerEvent</a>( <a href="qtimerevent.html">QTimerEvent</a> *e )
{
<a name="x1105"></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="x1101"></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="f372"></a>DigitalClock::showDate()
{
if ( showDateTimer != -1 ) // already showing date
return;
<a name="x1098"></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="x1103"></a><a name="x1100"></a><a name="x1099"></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="f373"></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="f374"></a>DigitalClock::showTime()
{
showingColon = !showingColon; // toggle/blink colon
<a name="x1104"></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 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. 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>.
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