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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickfusionknob_p.h"
#include <QtCore/qmath.h>
#include <QtGui/qpainter.h>
#include <QtQuick/private/qquickpalette_p.h>
#include <QtQuick/private/qquickitem_p.h>
QT_BEGIN_NAMESPACE
QQuickFusionKnob::QQuickFusionKnob(QQuickItem *parent)
: QQuickPaintedItem(parent)
{
connect(this, &QQuickItem::paletteChanged, this, [this](){ update(); });
}
// extracted from QStyleHelper::drawDial()
void QQuickFusionKnob::paint(QPainter *painter)
{
const qreal w = width();
const qreal h = height();
if (w <= 0 || h <= 0)
return;
QColor color = QQuickItemPrivate::get(this)->palette()->button();
color.setHsv(color.hue(),
qMin(140, color .saturation()),
qMax(180, color.value()));
color = color.lighter(104);
color.setAlphaF(0.8f);
const qreal sz = qMin(w, h);
QRectF rect(0, 0, sz, sz);
rect.moveCenter(QPointF(w / 2.0, h / 2.0));
const QPointF center = rect.center();
QRadialGradient gradient(center.x() + rect.width() / 2,
center.y() + rect.width(),
rect.width() * 2,
center.x(), center.y());
gradient.setColorAt(1, color.darker(140));
gradient.setColorAt(qreal(0.4), color.darker(120));
gradient.setColorAt(0, color.darker(110));
painter->setRenderHint(QPainter::Antialiasing);
painter->setBrush(gradient);
painter->setPen(QColor(255, 255, 255, 150));
painter->drawEllipse(rect);
painter->setPen(QColor(0, 0, 0, 80));
painter->drawEllipse(rect.adjusted(1, 1, -1, -1));
}
QT_END_NAMESPACE
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