Chris@58: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@0: 
Chris@0: /*
Chris@59:     Sonic Visualiser
Chris@59:     An audio file viewer and annotation editor.
Chris@59:     Centre for Digital Music, Queen Mary, University of London.
Chris@0:     
Chris@59:     This program is free software; you can redistribute it and/or
Chris@59:     modify it under the terms of the GNU General Public License as
Chris@59:     published by the Free Software Foundation; either version 2 of the
Chris@59:     License, or (at your option) any later version.  See the file
Chris@59:     COPYING included with this distribution for more information.
Chris@0: */
Chris@0: 
Chris@0: /**
Chris@0:  * Horizontal audio fader and meter widget.
Chris@0:  *
Chris@0:  * Based on the vertical fader and meter widget from the Hydrogen drum
Chris@0:  * machine.  (Any poor taste that has crept in during the
Chris@0:  * modifications for this application is entirely my own, however.)
Chris@0:  * The following copyright notice applies to code from this file, and
Chris@0:  * also to the files in icons/fader_*.png (also modified by me). --cc
Chris@0:  */
Chris@0: 
Chris@0: /**
Chris@0:  * Hydrogen
Chris@0:  * Copyright(c) 2002-2005 by Alex >Comix< Cominu [comix@users.sourceforge.net]
Chris@0:  *
Chris@0:  * http://www.hydrogen-music.org
Chris@0:  *
Chris@0:  * This program is free software; you can redistribute it and/or modify
Chris@0:  * it under the terms of the GNU General Public License as published by
Chris@0:  * the Free Software Foundation; either version 2 of the License, or
Chris@0:  * (at your option) any later version.
Chris@0:  *
Chris@0:  * This program is distributed in the hope that it will be useful,
Chris@0:  * but WITHOUT ANY WARRANTY, without even the implied warranty of
Chris@0:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Chris@0:  * GNU General Public License for more details.
Chris@0:  *
Chris@0:  * You should have received a copy of the GNU General Public License
Chris@0:  * along with this program; if not, write to the Free Software
Chris@0:  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
Chris@0:  */
Chris@0: 
Chris@0: 
Chris@0: #include "Fader.h"
Chris@0: 
Chris@0: #include "base/AudioLevel.h"
Chris@0: 
Chris@0: #include <QMouseEvent>
Chris@0: #include <QPixmap>
Chris@0: #include <QWheelEvent>
Chris@0: #include <QPaintEvent>
Chris@0: #include <QPainter>
Chris@0: 
Chris@0: Fader::Fader(QWidget *parent, bool withoutKnob) :
Chris@0:     QWidget(parent),
Chris@0:     m_withoutKnob(withoutKnob),
Chris@0:     m_value(1.0),
Chris@0:     m_peakLeft(0.0),
Chris@0:     m_peakRight(0.0)
Chris@0: {
Chris@0:     setMinimumSize(116, 23);
Chris@0:     setMaximumSize(116, 23);
Chris@0:     resize(116, 23);
Chris@0: 
Chris@0:     QString background_path = ":/icons/fader_background.png";
Chris@0:     bool ok = m_back.load(background_path);
Chris@0:     if (ok == false) {
Chris@0: 	std::cerr << "Fader: Error loading pixmap" << std::endl;
Chris@0:     }
Chris@0: 
Chris@0:     QString leds_path = ":/icons/fader_leds.png";
Chris@0:     ok = m_leds.load(leds_path);
Chris@0:     if (ok == false) {
Chris@0: 	std::cerr <<  "Error loading pixmap" << std::endl;
Chris@0:     }
Chris@0: 
Chris@0:     QString knob_path = ":/icons/fader_knob.png";
Chris@0:     ok = m_knob.load(knob_path);
Chris@0:     if (ok == false) {
Chris@0: 	std::cerr <<  "Error loading pixmap" << std::endl;
Chris@0:     }
Chris@0: 
Chris@0:     QString clip_path = ":/icons/fader_knob_red.png";
Chris@0:     ok = m_clip.load(clip_path);
Chris@0:     if (ok == false) {
Chris@0: 	std::cerr <<  "Error loading pixmap" << std::endl;
Chris@0:     }
Chris@0: }
Chris@0: 
Chris@0: Fader::~Fader()
Chris@0: {
Chris@0: 
Chris@0: }
Chris@0: 
Chris@0: void
Chris@0: Fader::mouseMoveEvent(QMouseEvent *ev)
Chris@0: {
Chris@0:     int x = ev->x() - 6;
Chris@0:     const int max_x = 116 - 12;
Chris@0: 
Chris@0:     int value = x;
Chris@0: 
Chris@0:     if (value > max_x) {
Chris@0: 	value = max_x;
Chris@0:     } else if (value < 0) {
Chris@0: 	value = 0;
Chris@0:     }
Chris@0: 
Chris@0: //    float fval = float(value) / float(max_x);
Chris@0:     float fval = AudioLevel::fader_to_multiplier
Chris@0: 	(value, max_x, AudioLevel::LongFader);
Chris@0: 
Chris@0:     setValue(fval);
Chris@0:     emit valueChanged(fval);
Chris@0: 
Chris@0:     update();
Chris@0: }
Chris@0: 
Chris@0: 
Chris@0: void
Chris@0: Fader::mouseDoubleClickEvent(QMouseEvent *)
Chris@0: {
Chris@0:     setValue(1.0);
Chris@0:     emit valueChanged(1.0);
Chris@0:     update();
Chris@0: }
Chris@0: 
Chris@0: void
Chris@0: Fader::mousePressEvent(QMouseEvent *ev)
Chris@0: {
Chris@82:     if (ev->button() == Qt::MidButton) {
Chris@82:         setValue(1.0);
Chris@82:         emit valueChanged(1.0);
Chris@82:         update();
Chris@82:         return;
Chris@82:     }
Chris@82: 
Chris@0:     int x = ev->x() - 6;
Chris@0:     const int max_x = 116 - 12;
Chris@0: 
Chris@0:     int value = x;
Chris@0: 
Chris@0:     if (value > max_x) {
Chris@0: 	value = max_x;
Chris@0:     } else if (value < 0) {
Chris@0: 	value = 0;
Chris@0:     }
Chris@0: 
Chris@0:     float fval = AudioLevel::fader_to_multiplier
Chris@0: 	(value, max_x, AudioLevel::LongFader);
Chris@0: 
Chris@0:     setValue(fval);
Chris@0:     emit valueChanged(fval);
Chris@0: 
Chris@0:     update();
Chris@0: }
Chris@0: 
Chris@0: 
Chris@0: void
Chris@0: Fader::wheelEvent(QWheelEvent *ev)
Chris@0: {
Chris@0:     ev->accept();
Chris@0: 
Chris@0:     //!!! needs improvement
Chris@0: 
Chris@0:     if (ev->delta() > 0) {
Chris@0: 	setValue(m_value * 1.1);
Chris@0:     } else {
Chris@0: 	setValue(m_value / 1.1);
Chris@0:     }
Chris@0: 
Chris@0:     update();
Chris@0:     emit valueChanged(getValue());
Chris@0: }
Chris@0: 
Chris@0: 
Chris@0: void
Chris@0: Fader::setValue(float v)
Chris@0: {
Chris@0:     float max = AudioLevel::dB_to_multiplier(10.0);
Chris@0: 
Chris@0:     if (v > max) {
Chris@0: 	v = max;
Chris@0:     } else if (v < 0.0) {
Chris@0: 	v = 0.0;
Chris@0:     }
Chris@0: 
Chris@0:     if (m_value != v) {
Chris@0: 	m_value = v;
Chris@0: 	float db = AudioLevel::multiplier_to_dB(m_value);
Chris@0: 	if (db <= AudioLevel::DB_FLOOR) {
Chris@0: 	    setToolTip(tr("Level: Off"));
Chris@0: 	} else {
Chris@0: 	    setToolTip(tr("Level: %1%2.%3%4 dB")
Chris@0: 		       .arg(db < 0.0 ? "-" : "")
Chris@0: 		       .arg(abs(int(db)))
Chris@0: 		       .arg(abs(int(db * 10.0) % 10))
Chris@0: 		       .arg(abs(int(db * 100.0) % 10)));
Chris@0: 	}
Chris@0: 	update();
Chris@0:     }
Chris@0: }
Chris@0: 
Chris@0: 
Chris@0: float
Chris@0: Fader::getValue()
Chris@0: {
Chris@0:     return m_value;
Chris@0: }
Chris@0: 
Chris@0: 
Chris@0: 
Chris@0: void
Chris@0: Fader::setPeakLeft(float peak)
Chris@0: {
Chris@0:     if (this->m_peakLeft != peak) {
Chris@0: 	this->m_peakLeft = peak;
Chris@0: 	update();
Chris@0:     }
Chris@0: }
Chris@0: 
Chris@0: 
Chris@0: void
Chris@0: Fader::setPeakRight(float peak) 
Chris@0: {
Chris@0:     if (this->m_peakRight != peak) {
Chris@0: 	this->m_peakRight = peak;
Chris@0: 	update();
Chris@0:     }
Chris@0: }
Chris@0: 
Chris@0: 
Chris@0: void
Chris@0: Fader::paintEvent(QPaintEvent *)
Chris@0: {
Chris@0:     QPainter painter(this);
Chris@0: 
Chris@0:     // background
Chris@0:     painter.drawPixmap(rect(), m_back, QRect(0, 0, 116, 23));
Chris@0: 
Chris@0:     int offset_L = AudioLevel::multiplier_to_fader(m_peakLeft, 116,
Chris@0: 						   AudioLevel::IEC268LongMeter);
Chris@0: 
Chris@0:     painter.drawPixmap(QRect(0, 0, offset_L, 11), m_leds,
Chris@0: 		       QRect(0, 0, offset_L, 11));
Chris@0: 
Chris@0:     int offset_R = AudioLevel::multiplier_to_fader(m_peakRight, 116,
Chris@0: 						   AudioLevel::IEC268LongMeter);
Chris@0: 
Chris@0:     painter.drawPixmap(QRect(0, 11, offset_R, 11), m_leds,
Chris@0: 		       QRect(0, 11, offset_R, 11));
Chris@0: 
Chris@0:     if (m_withoutKnob == false) {
Chris@0: 
Chris@0: 	static const uint knob_width = 29;
Chris@0: 	static const uint knob_height = 9;
Chris@0: 
Chris@0: 	int x = AudioLevel::multiplier_to_fader(m_value, 116 - knob_width,
Chris@0: 						AudioLevel::LongFader);
Chris@0: 
Chris@0: 	bool clipping = (m_peakLeft > 1.0 || m_peakRight > 1.0);
Chris@0: 
Chris@0: 	painter.drawPixmap(QRect(x, 7, knob_width, knob_height),
Chris@0: 			   clipping ? m_clip : m_knob,
Chris@0: 			   QRect(0, 0, knob_width, knob_height));
Chris@0:     }
Chris@0: }
Chris@0: 
Chris@0: