ledwidget.cpp Example File

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 #include "ledwidget.h"

 LEDWidget::LEDWidget(QWidget *parent)
     : QLabel(parent), onPixmap(":/ledon.png"), offPixmap(":/ledoff.png")
 {
     setPixmap(offPixmap);
     flashTimer.setInterval(200);
     flashTimer.setSingleShot(true);
     connect(&flashTimer, SIGNAL(timeout()), this, SLOT(extinguish()));
 };

 void LEDWidget::extinguish()
 {
     setPixmap(offPixmap);
 }

 void LEDWidget::flash()
 {
     setPixmap(onPixmap);
     flashTimer.start();
 }