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digitalclock.cpp Example File
widgets/digitalclock/digitalclock.cpp

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 #include <QtGui>

 #include "digitalclock.h"

 DigitalClock::DigitalClock(QWidget *parent)
     : QLCDNumber(parent)
 {
     setSegmentStyle(Filled);

     QTimer *timer = new QTimer(this);
     connect(timer, SIGNAL(timeout()), this, SLOT(showTime()));
     timer->start(1000);

     showTime();

     setWindowTitle(tr("Digital Clock"));
     resize(150, 60);
 }

 void DigitalClock::showTime()
 {
     QTime time = QTime::currentTime();
     QString text = time.toString("hh:mm");
     if ((time.second() % 2) == 0)
         text[2] = ' ';
     display(text);
 }