dclock-example.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/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"><!--h3.fn,span.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 timeand date.<p> <hr><p> Header file:<p> <pre>/****************************************************************************** $Id: qt/dclock.h 3.0.5 edited Oct 12 2001 $**** 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 <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 3.0.5 edited Oct 12 2001 $**** 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.//<a name="f331"></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="x902"></a>void DigitalClock::<a href="qobject.html#timerEvent">timerEvent</a>( <a href="qtimerevent.html">QTimerEvent</a> *e ){<a name="x905"></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="x901"></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="f332"></a>DigitalClock::showDate(){ if ( showDateTimer != -1 ) // already showing date return;<a name="x898"></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="x903"></a><a name="x900"></a><a name="x899"></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="f333"></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="f334"></a>DigitalClock::showTime(){ showingColon = !showingColon; // toggle/blink colon<a name="x904"></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 3.0.5 edited Oct 12 2001 $**** 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="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 © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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