levelmeter.h

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// SPDX-FileCopyrightText: Copyright (C) 2015 swift Project Community / Contributors
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-swift-pilot-client-1
// Class based on qt example: Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
 
 
#ifndef SWIFT_GUI_LEVELMETER_H
#define SWIFT_GUI_LEVELMETER_H
 
#include <QColor>
#include <QElapsedTimer>
#include <QFrame>
#include <QObject>
 
#include "gui/swiftguiexport.h"
 
class QPaintEvent;
class QTimer;
 
namespace swift::gui
{
    class SWIFT_GUI_EXPORT CLevelMeter : public QFrame
    {
        Q_OBJECT
 
        Q_PROPERTY(QColor lowColor READ getLowColor WRITE setLowColor)
        Q_PROPERTY(QColor highColor READ getHighColor WRITE setHighColor)
        Q_PROPERTY(QColor peakColor READ getPeakColor WRITE setPeakColor)
 
    public:
        CLevelMeter(QWidget *parent = nullptr);
 
        virtual ~CLevelMeter() override;
 
        void paintEvent(QPaintEvent *event) override;
 
        void reset();
 
        void levelChanged(double level);
 
        const QColor &getLowColor() const { return m_lowColor; }
        const QColor &getHighColor() const { return m_highColor; }
        const QColor &getPeakColor() const { return m_peakColor; }
        void setLowColor(const QColor &color) { m_lowColor = color; }
        void setHighColor(const QColor &color) { m_highColor = color; }
        void setPeakColor(const QColor &color) { m_peakColor = color; }
 
    private:
        void redrawTimerExpired();
 
        const int RedrawInterval = 100; // ms
        const int PeakHoldLevelDuration = 1000; // ms
 
        double m_level = 0.0;
 
        double m_peakLevel = 0.0;
 
        QElapsedTimer m_peakLevelChanged;
 
        static constexpr double High = 0.60;
        static constexpr double DecayValue = 0.10;
        QTimer *m_redrawTimer = nullptr;
        QColor m_lowColor; 
        QColor m_highColor; 
        QColor m_peakColor; 
    };
} // namespace swift::gui
 
#endif // SWIFT_GUI_LEVELMETER_H