view widgets/AudioDial.cpp @ 349:369a197737c7

* Various fixes to object lifetime management, particularly in the spectrum
  layer and for notification of main model deletion.
  The main purpose of this is to improve the behaviour of the spectrum, but I
  think it may also help with #1840922 Various crashes in Layer Summary window.

/* -*- 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>

using std::endl;
using std::cerr;


//!!! 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),
    m_meterColor(Qt::white),
    m_defaultValue(0),
    m_defaultMappedValue(0),
    m_mappedValue(0),
    m_noMappedUpdate(false),
    m_showTooltip(true),
    m_rangeMapper(0)
{
    m_mouseDial = false;
    m_mousePressed = false;
//    ++dialsExtant;
}


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


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

    float angle = AUDIO_DIAL_MIN // offset
	+ (AUDIO_DIAL_RANGE *
	   (float(QDial::value() - QDial::minimum()) /
	    (float(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();

    QColor meterColor(m_meterColor);
    if (!isEnabled())
	meterColor = palette().mid().color();
    else if (m_meterColor == Qt::white)
	meterColor = palette().highlight().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) {
	c = c.light(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() ) {
//	std::cerr << "Notches visible" << std::endl;
	pen.setColor(palette().dark().color());
	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);

//    std::cerr << "degrees " << degrees << ", gives us " << -(degrees - 45) * 16 << std::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;
    c = knobColor.dark();
    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);
	c = c.light(110);
    }

    // Scale shadow...

    shadowAngle = 2160;
    c = palette().dark().color();
    for (int arc = 120; arc < 2880; arc += 240) {
	pen.setColor(c);
	paint.setPen(pen);
	paint.drawArc(scale/2, scale/2,
		      width-scale, width-scale, shadowAngle + arc, 240);
	paint.drawArc(scale/2, scale/2,
		      width-scale, width-scale, shadowAngle - arc, 240);
	c = c.light(108);
    }

    // Undraw the bottom part...

    pen.setColor(palette().background().color());
    pen.setWidth(scale * 4);
    paint.setPen(pen);
    paint.drawArc(scale/2, scale/2,
		  width-scale, width-scale, -45 * 16, -92 * 16);

    // Scale ends...

    pen.setColor(palette().dark().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...

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

    float x0 = hyp;
    float y0 = hyp;

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

    c = palette().dark().color();
    pen.setColor(isEnabled() ? c.dark(130) : 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,
			 float angle, int size, bool internal)
{
    float hyp = float(size) / 2.0;
    float x0 = hyp - (hyp - 1) * sin(angle);
    float y0 = hyp + (hyp - 1) * cos(angle);

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

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

    } else {

	float len = hyp / 4;
	float x1 = hyp - (hyp + len) * sin(angle);
	float 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(float value)
{
    m_defaultMappedValue = value;
    if (m_rangeMapper) {
        m_defaultValue = m_rangeMapper->getPositionForValue(value);
    }
}

void AudioDial::setMappedValue(float mappedValue)
{
    if (m_rangeMapper) {
        int newPosition = m_rangeMapper->getPositionForValue(mappedValue);
        bool changed = (m_mappedValue != mappedValue);
        m_mappedValue = mappedValue;
        m_noMappedUpdate = true;
        std::cerr << "AudioDial::setMappedValue(" << mappedValue << "): new position is " << newPosition << std::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;
}


float AudioDial::mappedValue() const
{
    if (m_rangeMapper) {
//        std::cerr << "AudioDial::mappedValue(): value = " << value() << ", mappedValue = " << m_mappedValue << std::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 unit = "";
        QString text;
        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) {
        
        float min = m_rangeMapper->getValueForPosition(minimum());
        float max = m_rangeMapper->getValueForPosition(maximum());
        
        if (min > max) { 
            float 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);
            }
        }
        
        float newValue = QInputDialog::getDouble
            (this,
             tr("Enter new value"),
             text,
             m_mappedValue,
             min,
             max,
             4, 
             &ok);
        
        if (ok) {
            setMappedValue(newValue);
        }
        
    } else {
        
        int newPosition = QInputDialog::getInteger
            (this,
             tr("Enter new value"),
             tr("Enter a new value from %1 to %2:")
             .arg(minimum()).arg(maximum()),
             value(), minimum(), maximum(), pageStep(), &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();
}