view widgets/Fader.h @ 1551:e79731086b0f

Fixes to NoteLayer, particularly to calculation of vertical scale when model unit is not Hz. To avoid inconsistency we now behave as if the unit is always Hz from the point of view of the external API and display, converting at the point where we obtain values from the events themselves. Also various fixes to editing.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef FADER_H
#define FADER_H

/**
 * Horizontal audio fader and meter widget.
 * Based on the vertical fader and meter widget from:
 * 
 * Hydrogen
 * Copyright(c) 2002-2005 by Alex >Comix< Cominu [[e-mail]]
 * http://www.hydrogen-music.org
 */


#include <string>
#include <iostream>

#include <QWidget>
#include <QPixmap>
#include <QMouseEvent>
#include <QWheelEvent>
#include <QPaintEvent>

#include "base/Debug.h"

class Fader : public QWidget
{
    Q_OBJECT

public:
    Fader(QWidget *parent, bool withoutKnob = false);
    ~Fader();

    void setValue(float newValue);
    float getValue();

    void setPeakLeft(float);
    float getPeakLeft() { return m_peakLeft; }

    void setPeakRight(float);
    float getPeakRight() { return m_peakRight; }

signals:
    void valueChanged(float); // 0.0 -> 1.0

    void mouseEntered();
    void mouseLeft();

protected:
    void mousePressEvent(QMouseEvent *ev) override;
    void mouseDoubleClickEvent(QMouseEvent *ev) override;
    void mouseMoveEvent(QMouseEvent *ev) override;
    void mouseReleaseEvent(QMouseEvent *ev) override;
    void wheelEvent( QWheelEvent *ev ) override;
    void paintEvent(QPaintEvent *ev) override;
    void enterEvent(QEvent *) override;
    void leaveEvent(QEvent *) override;

    int getMaxX() const;

    bool m_withoutKnob;
    float m_value;
    float m_peakLeft;
    float m_peakRight;

    bool m_mousePressed;
    int m_mousePressX;
    float m_mousePressValue;

    QPixmap m_back;
    QPixmap m_leds;
    QPixmap m_knob;
    QPixmap m_clip;
};

#endif