How to write correctly an event handler

[franco.amato]

Hi to all,
I would know how to correctly write an event handler for example a keyPressEvent.

I wrote this event that I would catch when I press the space key:

void WaveWidget::keyPressEvent( QKeyEvent* pe )
{
	switch( pe->key() )
	{
		case Qt::Key_Space:
			{
				pe->accept();
				qDebug() << "Space pressed";
				m_wave->playSound();
			}
			break;
 
		default:
			pe->ignore();
			break;
	}
	QWidget::keyPressEvent(pe);
}

void WaveWidget::keyPressEvent( QKeyEvent* pe )
{
	switch( pe->key() )
	{
		case Qt::Key_Space:
			{
				pe->accept();
				qDebug() << "Space pressed";
				m_wave->playSound();
			}
			break;

		default:
			pe->ignore();
			break;
	}
	QWidget::keyPressEvent(pe);
}

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This is the correct way to write it? Must I accept the event with the right key and ignore in other case? And must I pass the event to the base class?

I don't know why in my case in doesn't work.

Best