qquickfusionbusyindicator.cpp

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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qquickfusionbusyindicator_p.h"
 
#include <QtGui/qpainter.h>
 
QT_BEGIN_NAMESPACE
 
QQuickFusionBusyIndicator::QQuickFusionBusyIndicator(QQuickItem *parent)
    : QQuickPaintedItem(parent)
{
}
 
QColor QQuickFusionBusyIndicator::color() const
{
    return m_color;
}
 
void QQuickFusionBusyIndicator::setColor(const QColor &color)
{
    if (color == m_color)
        return;
 
    m_color = color;
    update();
}
 
bool QQuickFusionBusyIndicator::isRunning() const
{
    return isVisible();
}
 
void QQuickFusionBusyIndicator::setRunning(bool running)
{
    if (running) {
        setVisible(true);
        update();
    }
}
 
void QQuickFusionBusyIndicator::paint(QPainter *painter)
{
    const qreal w = width();
    const qreal h = height();
    if (w <= 0 || h <= 0 || !isRunning())
        return;
 
    const qreal sz = qMin(w, h);
    const qreal dx = (w - sz) / 2;
    const qreal dy = (h - sz) / 2;
    const int hpw = qRound(qMax(qreal(1), sz / 14)) & -1;
    const int pw = 2 * hpw;
    const QRectF bounds(dx + hpw, dy + hpw, sz - pw - 1, sz - pw - 1);
 
    QConicalGradient gradient;
    gradient.setCenter(QPointF(dx + sz / 2, dy + sz / 2));
    gradient.setColorAt(0, m_color);
    gradient.setColorAt(0.1, m_color);
    gradient.setColorAt(1, Qt::transparent);
 
    painter->translate(0.5, 0.5);
    painter->setRenderHint(QPainter::Antialiasing, true);
    painter->setPen(QPen(gradient, pw, Qt::SolidLine));
    painter->drawArc(bounds, 0, 360 * 16);
    painter->setPen(QPen(m_color, pw, Qt::SolidLine, Qt::RoundCap));
    painter->drawArc(bounds, 0, 20 * 16);
}
 
void QQuickFusionBusyIndicator::itemChange(ItemChange change, const ItemChangeData &data)
{
    QQuickPaintedItem::itemChange(change, data);
 
    if (change == ItemOpacityHasChanged && qFuzzyIsNull(data.realValue))
        setVisible(false);
}
 
QT_END_NAMESPACE
 
#include "moc_qquickfusionbusyindicator_p.cpp"