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qt'QArrowWidget (./qt-2.1.0/src/widgets/qtoolbar.cpp:42)

class QArrowWidget : public QWidget
{
public:
    QArrowWidget( Qt::Orientation o, QWidget *parent ) : QWidget( parent ), orient( o ) {}

protected:
    void paintEvent( QPaintEvent * ) {
	QPainter p( this );
	QPointArray a;
	if ( orient == Horizontal ) {
	    int h = height();
	    a.setPoints( 5,  0, 0,  3, h / 4, 0, h / 2, 3,3 * h / 4, 0, h );
	} else {
	    int w = width();
	    a.setPoints( 5,  0, 0,  w / 4, 3 , w / 2, 0 , 3 * w / 4, 3 , w, 0 );
	}
	p.setPen( colorGroup().light() );
	p.drawPolyline( a );
	if ( orient == Qt::Horizontal )
	    a.translate( 1, 0 );
	else
	    a.translate( 0, 1 );
	p.setPen( colorGroup().midlight() );
	p.drawPolyline( a );
    }

private:
    Qt::Orientation orient;

};