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97 lines
2.6 KiB
C++
97 lines
2.6 KiB
C++
/* Copyright (C) 2015
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* swift project Community / Contributors
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*
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* This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
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* directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
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* or distributed except according to the terms contained in the LICENSE file.
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*
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* Class based on qt example: Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
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*/
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#include "blackgui/levelmeter.h"
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#include <math.h>
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#include <QPainter>
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#include <QRect>
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#include <QSizePolicy>
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#include <QTimer>
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#include <Qt>
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#include <QtGlobal>
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namespace BlackGui
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{
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CLevelMeter::CLevelMeter(QWidget *parent)
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: QFrame(parent),
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m_redrawTimer(new QTimer(this)),
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m_lowColor(Qt::gray),
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m_highColor(Qt::green),
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m_peakColor(255, 200, 200, 255)
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{
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this->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
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this->setMinimumWidth(30);
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connect(m_redrawTimer, &QTimer::timeout, this, &CLevelMeter::redrawTimerExpired);
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m_redrawTimer->start(RedrawInterval);
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m_redrawTimer->setObjectName("CLevelMeter");
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}
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CLevelMeter::~CLevelMeter()
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{ }
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void CLevelMeter::reset()
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{
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m_level = 0.0;
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m_peakLevel = 0.0;
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this->update();
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}
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void CLevelMeter::levelChanged(double level)
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{
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m_level = level;
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if (level > m_peakLevel)
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{
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m_peakLevel = level;
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m_peakLevelChanged.start();
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}
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}
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void CLevelMeter::redrawTimerExpired()
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{
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// decay
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if (m_peakLevelChanged.elapsed() > PeakHoldLevelDuration)
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{
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m_peakLevel -= DecayValue;
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if (m_peakLevel < m_level || m_peakLevel < 0)
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{
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m_peakLevel = 0.0;
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}
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}
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this->update();
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}
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void CLevelMeter::paintEvent(QPaintEvent *event)
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{
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Q_UNUSED(event)
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QPainter painter(this);
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QRect bar = this->contentsRect();
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painter.fillRect(bar, Qt::transparent);
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const int w = bar.width();
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const int left = rect().left();
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const int level = qRound(m_level * w);
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bar.setLeft(left);
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bar.setRight(level);
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painter.fillRect(bar, m_peakLevel >= High ? m_highColor : m_lowColor);
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if (m_peakLevel > m_level)
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{
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const int peak = qRound(m_peakLevel * w);
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bar.setLeft(level);
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bar.setRight(peak);
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painter.fillRect(bar, m_peakColor);
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}
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}
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} // namespace
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