Method paintEvent

src/frontend/widgets/qxtspanslider.cpp:669–702

! \reimp */

	\reimp
 */
void QxtSpanSlider::paintEvent(QPaintEvent*) {
	QStylePainter painter(this);

	// groove & ticks
	QStyleOptionSlider opt;
	qxt_d().initStyleOption(&opt);
	opt.sliderValue = 0;
	opt.sliderPosition = 0;
	opt.subControls = QStyle::SC_SliderGroove | QStyle::SC_SliderTickmarks;
	painter.drawComplexControl(QStyle::CC_Slider, opt);

	// handle rects
	opt.sliderPosition = qxt_d().lowerPos;
	const QRect lr = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
	const int lrv = qxt_d().pick(lr.center());
	opt.sliderPosition = qxt_d().upperPos;
	const QRect ur = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
	const int urv = qxt_d().pick(ur.center());

	// span
	const int minv = qMin(lrv, urv);
	const int maxv = qMax(lrv, urv);
	const QPoint c = QRect(lr.center(), ur.center()).center();
	QRect spanRect;
	if (orientation() == Qt::Horizontal)
		spanRect = QRect(QPoint(minv, c.y() - 2), QPoint(maxv, c.y() + 1));
	else
		spanRect = QRect(QPoint(c.x() - 2, minv), QPoint(c.x() + 1, maxv));
	qxt_d().drawSpan(&painter, spanRect);

	// handles
	qxt_d().drawHandle(&painter, QxtSpanSlider::UpperHandle);
	qxt_d().drawHandle(&painter, QxtSpanSlider::LowerHandle);
}