view widgets/AudioDial.cpp @ 1534:bfd8b22fd67c

Fix #1904 Scrolling colour 3d plot does not always work when in View normalisation mode. We shouldn't imagine we've just invalidated the cache if the truth is that we've only just created the renderer

/* -*- 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.
*/

/**
 * A rotary dial widget.
 *
 * Based on an original design by Thorsten Wilms.
 *
 * Implemented as a widget for the Rosegarden MIDI and audio sequencer
 * and notation editor by Chris Cannam.
 *
 * Extracted into a standalone Qt3 widget by Pedro Lopez-Cabanillas
 * and adapted for use in QSynth.
 * 
 * Ported to Qt4 by Chris Cannam.
 *
 * This file copyright 2003-2006 Chris Cannam, copyright 2005 Pedro
 * Lopez-Cabanillas, copyright 2006 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.
 */

#include "AudioDial.h"

#include "base/RangeMapper.h"

#include <cmath>
#include <iostream>

#include <QTimer>
#include <QPainter>
#include <QPixmap>
#include <QColormap>
#include <QMouseEvent>
#include <QPaintEvent>
#include <QInputDialog>

#include "base/Profiler.h"





//!!! Pedro updated his version to use my up/down response code from RG -- need to grab that code in preference to this version from Rui


//-------------------------------------------------------------------------
// AudioDial - Instance knob widget class.
//

#define AUDIO_DIAL_MIN (0.25 * M_PI)
#define AUDIO_DIAL_MAX (1.75 * M_PI)
#define AUDIO_DIAL_RANGE (AUDIO_DIAL_MAX - AUDIO_DIAL_MIN)


//static int dialsExtant = 0;


// Constructor.
AudioDial::AudioDial(QWidget *parent) :
    QDial(parent),
    m_knobColor(Qt::black),  // shorthand for "background colour" in paint()
    m_meterColor(Qt::white), // shorthand for "foreground colour" in paint()
    m_defaultValue(0),
    m_defaultMappedValue(0),
    m_mappedValue(0),
    m_noMappedUpdate(false),
    m_showTooltip(true),
    m_rangeMapper(nullptr)
{
    m_mouseDial = false;
    m_mousePressed = false;
//    ++dialsExtant;
}


// Destructor.
AudioDial::~AudioDial (void)
{
    delete m_rangeMapper;
//    --dialsExtant;
}


void AudioDial::setRangeMapper(RangeMapper *mapper)
{
//    cerr << "AudioDial[" << this << "][\"" << objectName() << "\"::setRangeMapper(" << mapper << ") [current is " << m_rangeMapper << "] (have " << dialsExtant << " dials extant)" << endl;

    if (m_rangeMapper == mapper) return;

    if (!m_rangeMapper && mapper) {
        connect(this, SIGNAL(valueChanged(int)),
                this, SLOT(updateMappedValue(int)));
    }

    delete m_rangeMapper;
    m_rangeMapper = mapper;

    updateMappedValue(value());
}


void AudioDial::paintEvent(QPaintEvent *)
{
    Profiler profiler("AudioDial::paintEvent");

    QPainter paint;

    double angle = AUDIO_DIAL_MIN // offset
        + (AUDIO_DIAL_RANGE *
           (double(QDial::value() - QDial::minimum()) /
            (double(QDial::maximum() - QDial::minimum()))));
    int degrees = int(angle * 180.0 / M_PI);

    int ns = notchSize();
    int numTicks = 1 + (maximum() + ns - minimum()) / ns;
        
    QColor knobColor(m_knobColor);
    if (knobColor == Qt::black) {
        knobColor = palette().window().color().lighter(150);
    }
    bool knobIsDark =
        (knobColor.red() + knobColor.green() + knobColor.blue() <= 384);

    QColor meterColor(m_meterColor);
    if (!isEnabled()) {
        meterColor = palette().mid().color();
    } else if (m_meterColor == Qt::white) {
        if (knobIsDark) {
            meterColor = palette().light().color();
        } else {
            meterColor = palette().highlight().color();
        }
    }

    QColor notchColor(palette().dark().color());
    if (knobIsDark) {
        notchColor = palette().light().color();
    }
    
    int m_size = width() < height() ? width() : height();
    int scale = 1;
    int width = m_size - 2*scale;

    paint.begin(this);
    paint.setRenderHint(QPainter::Antialiasing, true);
    paint.translate(1, 1);

    QPen pen;
    QColor c;

    // Knob body and face...

    c = knobColor;
    pen.setColor(knobColor);
    pen.setWidth(scale * 2);
    pen.setCapStyle(Qt::FlatCap);
        
    paint.setPen(pen);
    paint.setBrush(c);

    int indent = (int)(width * 0.15 + 1);

    paint.drawEllipse(indent-1, indent-1, width-2*indent, width-2*indent);

    pen.setWidth(3 * scale);
    int pos = indent-1 + (width-2*indent) / 20;
    int darkWidth = (width-2*indent) * 3 / 4;
    while (darkWidth) {
        if (knobIsDark) {
            c = c.darker(102);
        } else {
            c = c.lighter(102);
        }
        pen.setColor(c);
        paint.setPen(pen);
        paint.drawEllipse(pos, pos, darkWidth, darkWidth);
        if (!--darkWidth) break;
        paint.drawEllipse(pos, pos, darkWidth, darkWidth);
        if (!--darkWidth) break;
        paint.drawEllipse(pos, pos, darkWidth, darkWidth);
        ++pos; --darkWidth;
    }

    // Tick notches...

    if ( notchesVisible() ) {
//        cerr << "Notches visible" << endl;
        pen.setColor(notchColor);
        pen.setWidth(scale);
        paint.setPen(pen);
        for (int i = 0; i < numTicks; ++i) {
            int div = numTicks;
            if (div > 1) --div;
            drawTick(paint, AUDIO_DIAL_MIN + (AUDIO_DIAL_MAX - AUDIO_DIAL_MIN) * i / div,
                     width, true);
        }
    }

    // The bright metering bit...

    c = meterColor;
    pen.setColor(c);
    pen.setWidth(indent);
    paint.setPen(pen);

//    cerr << "degrees " << degrees << ", gives us " << -(degrees - 45) * 16 << endl;

    int arcLen = -(degrees - 45) * 16;
    if (arcLen == 0) arcLen = -16;

    paint.drawArc(indent/2, indent/2,
                  width-indent, width-indent, (180 + 45) * 16, arcLen);

    paint.setBrush(Qt::NoBrush);

    // Shadowing...

    pen.setWidth(scale);
    paint.setPen(pen);

    // Knob shadow...

    int shadowAngle = -720;
    if (knobIsDark) {
        c = knobColor.lighter();
    } else {
        c = knobColor.darker();
    }
    for (int arc = 120; arc < 2880; arc += 240) {
        pen.setColor(c);
        paint.setPen(pen);
        paint.drawArc(indent, indent,
                      width-2*indent, width-2*indent, shadowAngle + arc, 240);
        paint.drawArc(indent, indent,
                      width-2*indent, width-2*indent, shadowAngle - arc, 240);
        if (knobIsDark) {
            c = c.darker(110);
        } else {
            c = c.lighter(110);
        }
    }

    // Scale shadow, omitting the bottom part...

    shadowAngle = 2160;
    c = palette().shadow().color();
    for (int i = 0; i < 5; ++i) {
        pen.setColor(c);
        paint.setPen(pen);
        int arc = i * 240 + 120;
        paint.drawArc(scale/2, scale/2,
                      width-scale, width-scale, shadowAngle + arc, 240);
        c = c.lighter(110);
    }
    c = palette().shadow().color();
    for (int i = 0; i < 12; ++i) {
        pen.setColor(c);
        paint.setPen(pen);
        int arc = i * 240 + 120;
        paint.drawArc(scale/2, scale/2,
                      width-scale, width-scale, shadowAngle - arc, 240);
        c = c.lighter(110);
    }

    // Scale ends...

    if (knobIsDark) {
        pen.setColor(palette().mid().color());
    } else {
        pen.setColor(palette().shadow().color());
    }
    pen.setWidth(scale);
    paint.setPen(pen);
    for (int i = 0; i < numTicks; ++i) {
        if (i != 0 && i != numTicks - 1) continue;
        int div = numTicks;
        if (div > 1) --div;
        drawTick(paint, AUDIO_DIAL_MIN + (AUDIO_DIAL_MAX - AUDIO_DIAL_MIN) * i / div,
                 width, false);
    }

    // Pointer notch...

    double hyp = double(width) / 2.0;
    double len = hyp - indent;
    --len;

    double x0 = hyp;
    double y0 = hyp;

    double x = hyp - len * sin(angle);
    double y = hyp + len * cos(angle);

    c = notchColor;
    if (isEnabled()) {
        if (knobIsDark) {
            c = c.lighter(130);
        } else {
            c = c.darker(130);
        }
    }
    pen.setColor(c);
    pen.setWidth(scale * 2);
    paint.setPen(pen);
    paint.drawLine(int(x0), int(y0), int(x), int(y));

    paint.end();
}


void AudioDial::drawTick(QPainter &paint,
                         double angle, int size, bool internal)
{
    double hyp = double(size) / 2.0;
    double x0 = hyp - (hyp - 1) * sin(angle);
    double y0 = hyp + (hyp - 1) * cos(angle);

//    cerr << "drawTick: angle " << angle << ", size " << size << ", internal " << internal << endl;
    
    if (internal) {

        double len = hyp / 4;
        double x1 = hyp - (hyp - len) * sin(angle);
        double y1 = hyp + (hyp - len) * cos(angle);
                
        paint.drawLine(int(x0), int(y0), int(x1), int(y1));

    } else {

        double len = hyp / 4;
        double x1 = hyp - (hyp + len) * sin(angle);
        double y1 = hyp + (hyp + len) * cos(angle);

        paint.drawLine(int(x0), int(y0), int(x1), int(y1));
    }
}


void AudioDial::setKnobColor(const QColor& color)
{
    m_knobColor = color;
    update();
}


void AudioDial::setMeterColor(const QColor& color)
{
    m_meterColor = color;
    update();
}


void AudioDial::setMouseDial(bool mouseDial)
{
    m_mouseDial = mouseDial;
}


void AudioDial::setDefaultValue(int defaultValue)
{
    m_defaultValue = defaultValue;
    if (m_rangeMapper) {
        m_defaultMappedValue = m_rangeMapper->getValueForPosition(defaultValue);
    }
}

void AudioDial::setValue(int value)
{
    QDial::setValue(value);
    updateMappedValue(value);
}

void AudioDial::setDefaultMappedValue(double value)
{
    m_defaultMappedValue = value;
    if (m_rangeMapper) {
        m_defaultValue = m_rangeMapper->getPositionForValue(value);
    }
}

void AudioDial::setMappedValue(double mappedValue)
{
    if (m_rangeMapper) {
        int newPosition = m_rangeMapper->getPositionForValue(mappedValue);
        bool changed = (m_mappedValue != mappedValue);
        m_mappedValue = mappedValue;
        m_noMappedUpdate = true;
        SVDEBUG << "AudioDial::setMappedValue(" << mappedValue << "): new position is " << newPosition << endl;
        if (newPosition != value()) {
            setValue(newPosition);
        } else if (changed) {
            emit valueChanged(newPosition);
        }
        m_noMappedUpdate = false;
    } else {
        setValue(int(mappedValue));
    }
}


void AudioDial::setShowToolTip(bool show)
{
    m_showTooltip = show;
    m_noMappedUpdate = true;
    updateMappedValue(value());
    m_noMappedUpdate = false;
}


double AudioDial::mappedValue() const
{
    if (m_rangeMapper) {
//        SVDEBUG << "AudioDial::mappedValue(): value = " << value() << ", mappedValue = " << m_mappedValue << endl;
        return m_mappedValue;
    }
    return value();
}


void AudioDial::updateMappedValue(int value)
{
    if (!m_noMappedUpdate) {
        if (m_rangeMapper) {
            m_mappedValue = m_rangeMapper->getValueForPosition(value);
        } else {
            m_mappedValue = value;
        }
    }

    if (m_showTooltip) {
        QString name = objectName();
        QString label;
        if (m_rangeMapper) {
            label = m_rangeMapper->getLabel(value);
        }
        QString text;
        if (label != "") {
            if (name != "") {
                text = tr("%1: %2").arg(name).arg(label);
            } else {
                text = label;
            }
        } else {
            QString unit = "";
            if (m_rangeMapper) {
                unit = m_rangeMapper->getUnit();
            }
            if (name != "") {
                text = tr("%1: %2%3").arg(name).arg(m_mappedValue).arg(unit);
            } else {
                text = tr("%2%3").arg(m_mappedValue).arg(unit);
            }
        }
        setToolTip(text);
    }
}

void
AudioDial::setToDefault()
{
    if (m_rangeMapper) {
        setMappedValue(m_defaultMappedValue);
        return;
    }
    int dv = m_defaultValue;
    if (dv < minimum()) dv = minimum();
    if (dv > maximum()) dv = maximum();
    setValue(m_defaultValue);
}

// Alternate mouse behavior event handlers.
void AudioDial::mousePressEvent(QMouseEvent *mouseEvent)
{
    if (m_mouseDial) {
        QDial::mousePressEvent(mouseEvent);
    } else if (mouseEvent->button() == Qt::MidButton ||
               ((mouseEvent->button() == Qt::LeftButton) &&
                (mouseEvent->modifiers() & Qt::ControlModifier))) {
        setToDefault();
    } else if (mouseEvent->button() == Qt::LeftButton) {
        m_mousePressed = true;
        m_posMouse = mouseEvent->pos();
    }
}


void AudioDial::mouseDoubleClickEvent(QMouseEvent *mouseEvent)
{
    //!!! needs a common base class with Thumbwheel

    if (m_mouseDial) {
        QDial::mouseDoubleClickEvent(mouseEvent);
    } else if (mouseEvent->button() != Qt::LeftButton) {
        return;
    }

    bool ok = false;

    if (m_rangeMapper) {
        
        double min = m_rangeMapper->getValueForPosition(minimum());
        double max = m_rangeMapper->getValueForPosition(maximum());
        
        if (min > max) { 
            double tmp = min;
            min = max;
            max = tmp;
        }

        QString unit = m_rangeMapper->getUnit();
        
        QString text;
        if (objectName() != "") {
            if (unit != "") {
                text = tr("New value for %1, from %2 to %3 %4:")
                    .arg(objectName()).arg(min).arg(max).arg(unit);
            } else {
                text = tr("New value for %1, from %2 to %3:")
                    .arg(objectName()).arg(min).arg(max);
            }
        } else {
            if (unit != "") {
                text = tr("Enter a new value from %1 to %2 %3:")
                    .arg(min).arg(max).arg(unit);
            } else {
                text = tr("Enter a new value from %1 to %2:")
                    .arg(min).arg(max);
            }
        }
        
        double newValue = QInputDialog::getDouble
            (this,
             tr("Enter new value"),
             text,
             m_mappedValue,
             min,
             max,
             4, 
             &ok);
        
        if (ok) {
            setMappedValue(newValue);
        }
        
    } else {
        
        int newPosition = QInputDialog::getInt
            (this,
             tr("Enter new value"),
             tr("Enter a new value from %1 to %2:")
             .arg(minimum()).arg(maximum()),
             value(), minimum(), maximum(), singleStep(), &ok);
        
        if (ok) {
            setValue(newPosition);
        }
    }
}


void AudioDial::mouseMoveEvent(QMouseEvent *mouseEvent)
{
    if (m_mouseDial) {
        QDial::mouseMoveEvent(mouseEvent);
    } else if (m_mousePressed) {
        const QPoint& posMouse = mouseEvent->pos();
        int v = QDial::value()
            + (posMouse.x() - m_posMouse.x())
            + (m_posMouse.y() - posMouse.y());
        if (v > QDial::maximum())
            v = QDial::maximum();
        else
            if (v < QDial::minimum())
                v = QDial::minimum();
        m_posMouse = posMouse;
        QDial::setValue(v);
    }
}


void AudioDial::mouseReleaseEvent(QMouseEvent *mouseEvent)
{
    if (m_mouseDial) {
        QDial::mouseReleaseEvent(mouseEvent);
    } else if (m_mousePressed) {
        m_mousePressed = false;
    }
}

void
AudioDial::enterEvent(QEvent *e)
{
    QDial::enterEvent(e);
    emit mouseEntered();
}

void
AudioDial::leaveEvent(QEvent *e)
{
    QDial::enterEvent(e);
    emit mouseLeft();
}