view widgets/Fader.cpp @ 473:4f4f943bfdfc

* Merge from one-fftdataserver-per-fftmodel branch.  This bit of
reworking (which is not described very accurately by the title of
the branch) turns the MatrixFile object into something that either
reads or writes, but not both, and separates the FFT file cache
reader and writer implementations separately.  This allows the
FFT data server to have a single thread owning writers and one reader
per "customer" thread, and for all locking to be vastly simplified
and concentrated in the data server alone (because none of the
classes it makes use of is used in more than one thread at a time).
The result is faster and more trustworthy code.

/* -*- 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.
*/

/**
 * Horizontal audio fader and meter widget.
 *
 * Based on the vertical fader and meter widget from the Hydrogen drum
 * machine.  (Any poor taste that has crept in during the
 * modifications for this application is entirely my own, however.)
 * The following copyright notice applies to code from this file, and
 * also to the files in icons/fader_*.png (also modified by me). --cc
 */

/**
 * Hydrogen
 * Copyright(c) 2002-2005 by Alex >Comix< Cominu [[e-mail]]
 * http://www.hydrogen-music.org
 */


#include "Fader.h"

#include "base/AudioLevel.h"

#include <QMouseEvent>
#include <QPixmap>
#include <QWheelEvent>
#include <QPaintEvent>
#include <QPainter>
#include <QInputDialog>

#include <iostream>

Fader::Fader(QWidget *parent, bool withoutKnob) :
    QWidget(parent),
    m_withoutKnob(withoutKnob),
    m_value(1.0),
    m_peakLeft(0.0),
    m_peakRight(0.0),
    m_mousePressed(false)
{
    setMinimumSize(116, 23);
    setMaximumSize(116, 23);
    resize(116, 23);

    QString background_path = ":/icons/fader_background.png";
    bool ok = m_back.load(background_path);
    if (ok == false) {
	std::cerr << "Fader: Error loading pixmap" << std::endl;
    }

    QString leds_path = ":/icons/fader_leds.png";
    ok = m_leds.load(leds_path);
    if (ok == false) {
	std::cerr <<  "Error loading pixmap" << std::endl;
    }

    QString knob_path = ":/icons/fader_knob.png";
    ok = m_knob.load(knob_path);
    if (ok == false) {
	std::cerr <<  "Error loading pixmap" << std::endl;
    }

    QString clip_path = ":/icons/fader_knob_red.png";
    ok = m_clip.load(clip_path);
    if (ok == false) {
	std::cerr <<  "Error loading pixmap" << std::endl;
    }
}

Fader::~Fader()
{

}

void
Fader::mouseMoveEvent(QMouseEvent *ev)
{
    if (ev->button() == Qt::MidButton) {
        setValue(1.0);
        emit valueChanged(1.0);
        update();
        ev->accept();
        return;
    }
    if (!m_mousePressed) return;

    int x = ev->x();
    int diff = x - m_mousePressX;
    if (diff == 0) return;

    int vx = AudioLevel::multiplier_to_fader
        (m_mousePressValue, getMaxX(), AudioLevel::LongFader);

    vx += diff;

    if (vx > getMaxX()) vx = getMaxX();
    if (vx < 0) vx = 0;

    float fval = AudioLevel::fader_to_multiplier
	(vx, getMaxX(), AudioLevel::LongFader);

    setValue(fval);
    emit valueChanged(fval);
    ev->accept();
}


void
Fader::mouseReleaseEvent(QMouseEvent *ev)
{
    if (m_mousePressed) {
        mouseMoveEvent(ev);
        m_mousePressed = false;
    }
}

void
Fader::mouseDoubleClickEvent(QMouseEvent *)
{
    bool ok = false;
    float min = AudioLevel::fader_to_dB
        (0, getMaxX(), AudioLevel::LongFader);
    float max = AudioLevel::fader_to_dB
        (getMaxX(), getMaxX(), AudioLevel::LongFader);
    float deft = AudioLevel::multiplier_to_dB(m_value);

    float dB = QInputDialog::getDouble
        (this,
         tr("Enter new fader level"),
         tr("New fader level, from %1 to %2 dBFS:").arg(min).arg(max),
         deft, min, max, 3, &ok);

    if (ok) {
        float value = AudioLevel::dB_to_multiplier(dB);
        setValue(value);
        emit valueChanged(value);
        update();
    }
}

void
Fader::mousePressEvent(QMouseEvent *ev)
{
    if (ev->button() == Qt::MidButton ||
        ((ev->button() == Qt::LeftButton) &&
         (ev->modifiers() & Qt::ControlModifier))) {
        setValue(1.0);
        emit valueChanged(1.0);
        update();
        return;
    }

    if (ev->button() != Qt::LeftButton) return;
    m_mousePressed = true;
    m_mousePressX = ev->x();
    m_mousePressValue = getValue();
}


void
Fader::wheelEvent(QWheelEvent *ev)
{
    ev->accept();

    //!!! needs improvement

    if (ev->delta() > 0) {
	setValue(m_value * 1.1);
    } else {
	setValue(m_value / 1.1);
    }

    update();
    emit valueChanged(getValue());
}

void
Fader::enterEvent(QEvent *)
{
    emit mouseEntered();
}

void
Fader::leaveEvent(QEvent *)
{
    emit mouseLeft();
}

void
Fader::setValue(float v)
{
    float max = AudioLevel::dB_to_multiplier(10.0);

    if (v > max) {
	v = max;
    } else if (v < 0.0) {
	v = 0.0;
    }

    if (m_value != v) {
	m_value = v;
	float db = AudioLevel::multiplier_to_dB(m_value);
        QString text;
	if (db <= AudioLevel::DB_FLOOR) {
            text = tr("Level: Off");
	} else {
            text = tr("Level: %1%2.%3%4 dB")
                .arg(db < 0.0 ? "-" : "")
                .arg(abs(int(db)))
                .arg(abs(int(db * 10.0) % 10))
                .arg(abs(int(db * 100.0) % 10));
	}
        std::cerr << "Fader: setting tooltip to \"" << text.toStdString() << "\"" << std::endl;
        QWidget::setToolTip(text);
	update();
    }
}


float
Fader::getValue()
{
    return m_value;
}



void
Fader::setPeakLeft(float peak)
{
    if (this->m_peakLeft != peak) {
	this->m_peakLeft = peak;
	update();
    }
}


void
Fader::setPeakRight(float peak) 
{
    if (this->m_peakRight != peak) {
	this->m_peakRight = peak;
	update();
    }
}


void
Fader::paintEvent(QPaintEvent *)
{
    QPainter painter(this);

    // background
    painter.drawPixmap(rect(), m_back, QRect(0, 0, 116, 23));

    int offset_L = AudioLevel::multiplier_to_fader(m_peakLeft, 116,
						   AudioLevel::IEC268LongMeter);

    painter.drawPixmap(QRect(0, 0, offset_L, 11), m_leds,
		       QRect(0, 0, offset_L, 11));

    int offset_R = AudioLevel::multiplier_to_fader(m_peakRight, 116,
						   AudioLevel::IEC268LongMeter);

    painter.drawPixmap(QRect(0, 11, offset_R, 11), m_leds,
		       QRect(0, 11, offset_R, 11));

    if (m_withoutKnob == false) {

	static const uint knob_width = 29;
	static const uint knob_height = 9;

	int x = AudioLevel::multiplier_to_fader(m_value, 116 - knob_width,
						AudioLevel::LongFader);

	bool clipping = (m_peakLeft > 1.0 || m_peakRight > 1.0);

	painter.drawPixmap(QRect(x, 7, knob_width, knob_height),
			   clipping ? m_clip : m_knob,
			   QRect(0, 0, knob_width, knob_height));
    }
}

int
Fader::getMaxX() const
{
    return 116 - 12;
}