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qApp->processEvents();

MyWidget::startTimer()
{
  time.start(); // QTime time in declaration
  timer->start( 1000 );
}

void MyWidget::timerSlot()
{
  label->setNum( time.elapsed() );
}

#include <QtGui/QApplication>
#include <QLCDNumber>
#include <QThread>
#include <QEvent>
#include <QTime>
#include <QMouseEvent>

enum EventType {
	EVENT_UPDATE = QEvent::User + 1
};

class UpdateEvent : public QEvent
{
public:
	UpdateEvent(int num) : QEvent((QEvent::Type) EVENT_UPDATE), 
		number(num) {;}

	int number;
};

class UpdateThread : public QThread
{
public:
	UpdateThread(QObject* o) : QThread(o), receiver(o) {;}

	virtual void run() {

		time.start();
		while(true) {
			UpdateEvent* event = new UpdateEvent(time.elapsed());
			QApplication::postEvent(receiver, event);
			msleep(1);
		}
	}

private:
	QTime time;
	QObject* receiver;
};

class QTestWidget : public QLCDNumber
{
public:
	QTestWidget(QLCDNumber* w = NULL) : QLCDNumber(w) {;}
protected:
	void mousePressEvent(QMouseEvent* e) {
		QApplication::sendPostedEvents(this, EVENT_UPDATE);
	}

	bool event(QEvent* e) {
		if(e->type() == EVENT_UPDATE) {

			UpdateEvent* event = (UpdateEvent*) e;
			display(event->number);
			return true;
		} else {
			QApplication::sendPostedEvents(this, EVENT_UPDATE);
		}

		return QLCDNumber::event(e);
	}
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QTestWidget w;
    w.show();

	UpdateThread t(&w);
	t.start();

    return a.exec();
}

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

ClockWindow::ClockWindow()
{
	...
	timer = new QTimer(this);
	connect(timer, SIGNAL(timeout()), this, SLOT(repaint()));
	timer->start(1000);
}

void ClockWindow::paintEvent(QPaintEvent *event)
{
	setPalette(QPalette(clockSettings.bgColor));
	
	QDateTime currentDatetime = QDateTime::currentDateTime();
	
	QPainter painter(this);
	painter.setFont(clockSettings.font);
	QFontMetrics fontMetrics(clockSettings.font);

	QString textToDisplay = currentDatetime.toString(clockSettings.currentDatetimeFormat);
	QRect endRect = painter.boundingRect(x(), y(), width(), height(), 0, "  "+textToDisplay+"  ");

	if (endRect != startRect) {
		setGeometry(endRect);
	}

	if (clockSettings.border) {
		painter.setPen(clockSettings.borderColor);
		painter.drawRect(0, 0, width() - 1, height() - 1);
	}

	painter.setPen(clockSettings.fontColor);
	painter.drawText((width() - fontMetrics.width(textToDisplay)) / 2, fontMetrics.ascent(), textToDisplay);
}