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// SPDX-FileCopyrightText: 2021 Nheko Contributors
// SPDX-FileCopyrightText: 2022 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later
#include "LoadingIndicator.h"
#include <QPaintEvent>
#include <QPainter>
#include <QTimer>
LoadingIndicator::LoadingIndicator(QWidget *parent)
: QWidget(parent)
, interval_(70)
, angle_(0)
, color_(Qt::black)
{
setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
setFocusPolicy(Qt::NoFocus);
timer_ = new QTimer(this);
connect(timer_, SIGNAL(timeout()), this, SLOT(onTimeout()));
}
void
LoadingIndicator::paintEvent(QPaintEvent *e)
{
Q_UNUSED(e)
if (!timer_->isActive())
return;
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
int width = qMin(this->width(), this->height());
int outerRadius = (width - 4) * 0.5f;
int innerRadius = outerRadius * 0.78f;
int capsuleRadius = (outerRadius - innerRadius) / 2;
for (int i = 0; i < 8; ++i) {
QColor color = color_;
color.setAlphaF(1.0f - (i / 8.0f));
painter.setPen(Qt::NoPen);
painter.setBrush(color);
qreal radius = capsuleRadius * (1.0f - (i / 16.0f));
painter.save();
painter.translate(rect().center());
painter.rotate(angle_ - i * 45.0f);
QPointF center = QPointF(-capsuleRadius, -innerRadius);
painter.drawEllipse(center, radius * 2, radius * 2);
painter.restore();
}
}
void
LoadingIndicator::start()
{
timer_->start(interval_);
show();
}
void
LoadingIndicator::stop()
{
timer_->stop();
hide();
}
void
LoadingIndicator::onTimeout()
{
angle_ = (angle_ + 45) % 360;
repaint();
}
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