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f4c2939253
* Include only what is used * Use forward declaration when possible * Sorted includes refs #598
91 lines
2.5 KiB
C++
91 lines
2.5 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 and at http://www.swift-project.org/license.html. No part of swift project,
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* including this file, may be copied, modified, propagated, or distributed except according to the terms
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* 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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//! \file
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#ifndef BLACKGUI_LEVELMETER_H
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#define BLACKGUI_LEVELMETER_H
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#include "blackgui/blackguiexport.h"
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#include <QColor>
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#include <QObject>
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#include <QTime>
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#include <QWidget>
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class QPaintEvent;
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class QTimer;
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namespace BlackGui
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{
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//! Widget which displays a vertical audio level meter, indicating the
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//! RMS and peak levels of the window of audio samples most recently analyzed
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//! by the Engine.
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class BLACKGUI_EXPORT CLevelMeter : public QWidget
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{
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Q_OBJECT
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public:
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//! Constructor
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CLevelMeter(QWidget *parent = nullptr);
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//! Destructor
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~CLevelMeter();
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//! \copydoc QWidget::paintEvent
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void paintEvent(QPaintEvent *event) override;
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public slots:
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//! Clean up
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void reset();
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//! Values
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void levelChanged(double rmsLevel, double peakLevel, int numSamples);
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private slots:
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void ps_redrawTimerExpired();
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private:
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const int RedrawInterval = 100; // ms
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const double PeakDecayRate = 0.001;
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const int PeakHoldLevelDuration = 2000; // ms
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//! Height of RMS level bar, range 0.0 - 1.0.
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double m_rmsLevel = 0.0;
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//! Most recent peak level, range 0.0 - 1.0.
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double m_peakLevel = 0.0;
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//! Height of peak level bar.
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//! This is calculated by decaying m_peakLevel depending on the elapsed time since m_peakLevelChanged, and the value of m_decayRate.
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double m_decayedPeakLevel = 0.0;
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//! Time at which m_peakLevel was last changed.
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QTime m_peakLevelChanged;
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//! Rate at which peak level bar decays. Expressed in level units / millisecond.
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double m_peakDecayRate;
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//! High watermark of peak level. Range 0.0 - 1.0.
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double m_peakHoldLevel = 0.0;
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//! Time at which m_peakHoldLevel was last changed.
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QTime m_peakHoldLevelChanged;
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QTimer *m_redrawTimer = nullptr;
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QColor m_rmsColor;
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QColor m_peakColor;
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};
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}
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#endif // guard
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