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222 lines
7.8 KiB
222 lines
7.8 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/dclock/dclock.doc:4 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Digital Clock</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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| <a href="annotated.html">
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<font color="#004faf">Annotated</font></a>
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| <a href="groups.html">
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<font color="#004faf">Grouped Classes</font></a>
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| <a href="functions.html">
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<font color="#004faf">Functions</font></a>
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</td>
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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>
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<p>
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This example displays a digital LCD clock that can switch between time
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and date.
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<p> <hr>
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<p> Header file:
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<p> <pre>/****************************************************************************
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** $Id: qt/dclock.h 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#ifndef DCLOCK_H
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#define DCLOCK_H
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#include <<a href="qlcdnumber-h.html">qlcdnumber.h</a>>
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class DigitalClock : public <a href="qlcdnumber.html">QLCDNumber</a> // digital clock widget
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{
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<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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public:
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DigitalClock( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 );
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protected: // event handlers
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void timerEvent( <a href="qtimerevent.html">QTimerEvent</a> * );
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void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
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private slots: // internal slots
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void stopDate();
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void showTime();
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private: // internal data
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void showDate();
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bool showingColon;
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int normalTimer;
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int showDateTimer;
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};
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#endif // DCLOCK_H
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</pre>
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/dclock.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "dclock.h"
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#include <<a href="qdatetime-h.html">qdatetime.h</a>>
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//
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// Constructs a DigitalClock widget with a parent and a name.
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//
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<a name="f371"></a>DigitalClock::DigitalClock( <a href="qwidget.html">QWidget</a> *parent, const char *name )
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: <a href="qlcdnumber.html">QLCDNumber</a>( parent, name )
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{
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showingColon = FALSE;
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<a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Raised );
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<a href="qframe.html#setLineWidth">setLineWidth</a>( 2 ); // set frame line width
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showTime(); // display the current time
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normalTimer = <a href="qobject.html#startTimer">startTimer</a>( 500 ); // 1/2 second timer events
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showDateTimer = -1; // not showing date
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}
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//
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// Handles timer events for the digital clock widget.
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// There are two different timers; one timer for updating the clock
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// and another one for switching back from date mode to time mode.
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//
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<a name="x1102"></a>void DigitalClock::<a href="qobject.html#timerEvent">timerEvent</a>( <a href="qtimerevent.html">QTimerEvent</a> *e )
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{
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<a name="x1105"></a> if ( e-><a href="qtimerevent.html#timerId">timerId</a>() == showDateTimer ) // stop showing date
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stopDate();
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else { // normal timer
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if ( showDateTimer == -1 ) // not showing date
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showTime();
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}
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}
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//
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// Enters date mode when the left mouse button is pressed.
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//
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void DigitalClock::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
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{
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<a name="x1101"></a> if ( e-><a href="qmouseevent.html#button">button</a>() == QMouseEvent::LeftButton ) // left button pressed
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showDate();
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}
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//
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// Shows the current date in the internal lcd widget.
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// Fires a timer to stop showing the date.
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//
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void <a name="f372"></a>DigitalClock::showDate()
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{
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if ( showDateTimer != -1 ) // already showing date
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return;
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<a name="x1098"></a> <a href="qdate.html">QDate</a> date = QDate::<a href="qdate.html#currentDate">currentDate</a>();
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<a href="qstring.html">QString</a> s;
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<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>() );
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<a href="qlcdnumber.html#display">display</a>( s ); // sets the LCD number/text
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showDateTimer = <a href="qobject.html#startTimer">startTimer</a>( 2000 ); // keep this state for 2 secs
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}
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//
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// Stops showing the date.
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//
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void <a name="f373"></a>DigitalClock::stopDate()
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{
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<a href="qobject.html#killTimer">killTimer</a>( showDateTimer );
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showDateTimer = -1;
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showTime();
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}
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//
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// Shows the current time in the internal lcd widget.
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//
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void <a name="f374"></a>DigitalClock::showTime()
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{
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showingColon = !showingColon; // toggle/blink colon
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<a name="x1104"></a> <a href="qstring.html">QString</a> s = QTime::<a href="qtime.html#currentTime">currentTime</a>().toString().left(5);
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if ( !showingColon )
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s[2] = ' ';
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if ( s[0] == '0' )
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s[0] = ' ';
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<a href="qlcdnumber.html#display">display</a>( s ); // set LCD number/text
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}
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</pre>
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<p> <hr>
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<p> Main:
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<p> <pre>/****************************************************************************
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** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "dclock.h"
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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int main( int argc, char **argv )
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{
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<a href="qapplication.html">QApplication</a> a( argc, argv );
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DigitalClock *clock = new DigitalClock;
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clock-><a href="qwidget.html#resize">resize</a>( 170, 80 );
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a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( clock );
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clock-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Digital Clock");
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clock-><a href="qwidget.html#show">show</a>();
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return a.<a href="qapplication.html#exec">exec</a>();
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}
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</pre>
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<p>See also <a href="examples.html">Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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