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