matrixion/src/ui/RippleOverlay.cpp

// SPDX-FileCopyrightText: 2021 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later

#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);
}

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);
}