source: trunk/doc/html/dclock-example.html@ 204

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2<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/dclock/dclock.doc:4 -->
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4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>Digital Clock</title>
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30<font color="#004faf">Functions</font></a>
31</td>
32<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>
33
34
35<p>
36This example displays a digital LCD clock that can switch between time
37and date.
38<p> <hr>
39<p> Header file:
40<p> <pre>/****************************************************************************
41** $Id: dclock-example.html 2051 2007-02-21 10:04:20Z chehrlic $
42**
43** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
44**
45** This file is part of an example program for Qt. This example
46** program may be used, distributed and modified without limitation.
47**
48*****************************************************************************/
49
50#ifndef DCLOCK_H
51#define DCLOCK_H
52
53#include &lt;<a href="qlcdnumber-h.html">qlcdnumber.h</a>&gt;
54
55
56class DigitalClock : public <a href="qlcdnumber.html">QLCDNumber</a> // digital clock widget
57{
58 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
59public:
60 DigitalClock( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 );
61
62protected: // event handlers
63 void timerEvent( <a href="qtimerevent.html">QTimerEvent</a> * );
64 void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
65
66private slots: // internal slots
67 void stopDate();
68 void showTime();
69
70private: // internal data
71 void showDate();
72
73 bool showingColon;
74 int normalTimer;
75 int showDateTimer;
76};
77
78
79#endif // DCLOCK_H
80</pre>
81
82<p> <hr>
83<p> Implementation:
84<p> <pre>/****************************************************************************
85** $Id: dclock-example.html 2051 2007-02-21 10:04:20Z chehrlic $
86**
87** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
88**
89** This file is part of an example program for Qt. This example
90** program may be used, distributed and modified without limitation.
91**
92*****************************************************************************/
93
94#include "dclock.h"
95#include &lt;<a href="qdatetime-h.html">qdatetime.h</a>&gt;
96
97
98//
99// Constructs a DigitalClock widget with a parent and a name.
100//
101
102<a name="f371"></a>DigitalClock::DigitalClock( <a href="qwidget.html">QWidget</a> *parent, const char *name )
103 : <a href="qlcdnumber.html">QLCDNumber</a>( parent, name )
104{
105 showingColon = FALSE;
106 <a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Raised );
107 <a href="qframe.html#setLineWidth">setLineWidth</a>( 2 ); // set frame line width
108 showTime(); // display the current time
109 normalTimer = <a href="qobject.html#startTimer">startTimer</a>( 500 ); // 1/2 second timer events
110 showDateTimer = -1; // not showing date
111}
112
113
114//
115// Handles timer events for the digital clock widget.
116// There are two different timers; one timer for updating the clock
117// and another one for switching back from date mode to time mode.
118//
119
120<a name="x1102"></a>void DigitalClock::<a href="qobject.html#timerEvent">timerEvent</a>( <a href="qtimerevent.html">QTimerEvent</a> *e )
121{
122<a name="x1105"></a> if ( e-&gt;<a href="qtimerevent.html#timerId">timerId</a>() == showDateTimer ) // stop showing date
123 stopDate();
124 else { // normal timer
125 if ( showDateTimer == -1 ) // not showing date
126 showTime();
127 }
128}
129
130//
131// Enters date mode when the left mouse button is pressed.
132//
133
134void DigitalClock::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
135{
136<a name="x1101"></a> if ( e-&gt;<a href="qmouseevent.html#button">button</a>() == QMouseEvent::LeftButton ) // left button pressed
137 showDate();
138}
139
140
141//
142// Shows the current date in the internal lcd widget.
143// Fires a timer to stop showing the date.
144//
145
146void <a name="f372"></a>DigitalClock::showDate()
147{
148 if ( showDateTimer != -1 ) // already showing date
149 return;
150<a name="x1098"></a> <a href="qdate.html">QDate</a> date = QDate::<a href="qdate.html#currentDate">currentDate</a>();
151 <a href="qstring.html">QString</a> s;
152<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>() );
153 <a href="qlcdnumber.html#display">display</a>( s ); // sets the LCD number/text
154 showDateTimer = <a href="qobject.html#startTimer">startTimer</a>( 2000 ); // keep this state for 2 secs
155}
156
157//
158// Stops showing the date.
159//
160
161void <a name="f373"></a>DigitalClock::stopDate()
162{
163 <a href="qobject.html#killTimer">killTimer</a>( showDateTimer );
164 showDateTimer = -1;
165 showTime();
166}
167
168//
169// Shows the current time in the internal lcd widget.
170//
171
172void <a name="f374"></a>DigitalClock::showTime()
173{
174 showingColon = !showingColon; // toggle/blink colon
175<a name="x1104"></a> <a href="qstring.html">QString</a> s = QTime::<a href="qtime.html#currentTime">currentTime</a>().toString().left(5);
176 if ( !showingColon )
177 s[2] = ' ';
178 if ( s[0] == '0' )
179 s[0] = ' ';
180 <a href="qlcdnumber.html#display">display</a>( s ); // set LCD number/text
181}
182</pre>
183
184<p> <hr>
185<p> Main:
186<p> <pre>/****************************************************************************
187** $Id: dclock-example.html 2051 2007-02-21 10:04:20Z chehrlic $
188**
189** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
190**
191** This file is part of an example program for Qt. This example
192** program may be used, distributed and modified without limitation.
193**
194*****************************************************************************/
195
196#include "dclock.h"
197#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
198
199
200int main( int argc, char **argv )
201{
202 <a href="qapplication.html">QApplication</a> a( argc, argv );
203 DigitalClock *clock = new DigitalClock;
204 clock-&gt;<a href="qwidget.html#resize">resize</a>( 170, 80 );
205 a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( clock );
206 clock-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Digital Clock");
207 clock-&gt;<a href="qwidget.html#show">show</a>();
208 return a.<a href="qapplication.html#exec">exec</a>();
209}
210</pre>
211
212<p>See also <a href="examples.html">Examples</a>.
213
214<!-- eof -->
215<p><address><hr><div align=center>
216<table width=100% cellspacing=0 border=0><tr>
217<td>Copyright &copy; 2007
218<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
219<td align=right><div align=right>Qt 3.3.8</div>
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