matrixion/src/ui/RippleOverlay.cc

#include <QPainter>

#include "Ripple.h"
#include "RippleOverlay.h"

RippleOverlay::RippleOverlay(QWidget *parent)
    : OverlayWidget(parent)
    , use_clip_(false)
{
	setAttribute(Qt::WA_TransparentForMouseEvents);
	setAttribute(Qt::WA_NoSystemBackground);
}

RippleOverlay::~RippleOverlay()
{
}

void RippleOverlay::addRipple(Ripple *ripple)
{
	ripple->setOverlay(this);
	ripples_.push_back(ripple);
	ripple->start();
}

void RippleOverlay::addRipple(const QPoint &position, qreal radius)
{
	Ripple *ripple = new Ripple(position);
	ripple->setRadiusEndValue(radius);
	addRipple(ripple);
}

void RippleOverlay::removeRipple(Ripple *ripple)
{
	if (ripples_.removeOne(ripple))
		delete ripple;
}

void RippleOverlay::paintEvent(QPaintEvent *event)
{
	Q_UNUSED(event)

	QPainter painter(this);
	painter.setRenderHint(QPainter::Antialiasing);
	painter.setPen(Qt::NoPen);

	if (use_clip_)
		painter.setClipPath(clip_path_);

	for (auto it = ripples_.constBegin(); it != ripples_.constEnd(); it++)
		paintRipple(&painter, *it);
}

void RippleOverlay::paintRipple(QPainter *painter, Ripple *ripple)
{
	const qreal radius = ripple->radius();
	const QPointF center = ripple->center();

	painter->setOpacity(ripple->opacity());
	painter->setBrush(ripple->brush());
	painter->drawEllipse(center, radius, radius);
}