/usr/share/qt3/doc/html/dclock-example.html

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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 &lt;<a href="qlcdnumber-h.html">qlcdnumber.h</a>&gt;


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 &lt;<a href="qdatetime-h.html">qdatetime.h</a>&gt;


//
// 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-&gt;<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-&gt;<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 &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;


int main( int argc, char **argv )
{
    <a href="qapplication.html">QApplication</a> a( argc, argv );
    DigitalClock *clock = new DigitalClock;
    clock-&gt;<a href="qwidget.html#resize">resize</a>( 170, 80 );
    a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( clock );
    clock-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Digital Clock");
    clock-&gt;<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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