Chris@132: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@132: 
Chris@132: /*
Chris@132:     Sonic Visualiser
Chris@132:     An audio file viewer and annotation editor.
Chris@132:     Centre for Digital Music, Queen Mary, University of London.
Chris@132:     This file copyright 2006 Chris Cannam.
Chris@132: 
Chris@132:     This program is free software; you can redistribute it and/or
Chris@132:     modify it under the terms of the GNU General Public License as
Chris@132:     published by the Free Software Foundation; either version 2 of the
Chris@132:     License, or (at your option) any later version.  See the file
Chris@132:     COPYING included with this distribution for more information.
Chris@132: */
Chris@132: 
Chris@132: #include "Thumbwheel.h"
Chris@132: 
Chris@132: #include <QMouseEvent>
Chris@132: #include <QPaintEvent>
Chris@132: #include <QWheelEvent>
Chris@132: #include <QPainter>
Chris@132: 
Chris@132: #include <cmath>
Chris@132: #include <iostream>
Chris@132: 
Chris@133: Thumbwheel::Thumbwheel(Qt::Orientation orientation,
Chris@132: 		       QWidget *parent) :
Chris@132:     QWidget(parent),
Chris@133:     m_min(0),
Chris@133:     m_max(100),
Chris@133:     m_default(50),
Chris@133:     m_value(50),
Chris@132:     m_orientation(orientation),
Chris@133:     m_speed(0.25),
Chris@132:     m_tracking(true),
Chris@132:     m_showScale(true),
Chris@132:     m_clicked(false),
Chris@133:     m_atDefault(true),
Chris@132:     m_clickValue(m_value)
Chris@132: {
Chris@132: }
Chris@132: 
Chris@132: Thumbwheel::~Thumbwheel()
Chris@132: {
Chris@132: }
Chris@132: 
Chris@132: void
Chris@133: Thumbwheel::setMinimumValue(int min)
Chris@133: {
Chris@133:     if (m_min == min) return;
Chris@133: 
Chris@133:     m_min = min;
Chris@133:     if (m_max <= m_min) m_max = m_min + 1;
Chris@133:     if (m_value < m_min) m_value = m_min;
Chris@133:     if (m_value > m_max) m_value = m_max;
Chris@133: }
Chris@133: 
Chris@133: int
Chris@133: Thumbwheel::getMinimumValue() const
Chris@133: {
Chris@133:     return m_min;
Chris@133: }
Chris@133: 
Chris@133: void
Chris@133: Thumbwheel::setMaximumValue(int max)
Chris@133: {
Chris@133:     if (m_max == max) return;
Chris@133: 
Chris@133:     m_max = max;
Chris@133:     if (m_min >= m_max) m_min = m_max - 1;
Chris@133:     if (m_value < m_min) m_value = m_min;
Chris@133:     if (m_value > m_max) m_value = m_max;
Chris@133: }
Chris@133: 
Chris@133: int
Chris@133: Thumbwheel::getMaximumValue() const
Chris@133: {
Chris@133:     return m_max;
Chris@133: }
Chris@133: 
Chris@133: void
Chris@133: Thumbwheel::setDefaultValue(int deft)
Chris@133: {
Chris@133:     if (m_default == deft) return;
Chris@133: 
Chris@133:     m_default = deft;
Chris@133:     if (m_atDefault) {
Chris@133:         setValue(m_default);
Chris@133:         emit valueChanged(getValue());
Chris@133:     }
Chris@133: }
Chris@133: 
Chris@133: int
Chris@133: Thumbwheel::getDefaultValue() const
Chris@133: {
Chris@133:     return m_default;
Chris@133: }
Chris@133: 
Chris@133: void
Chris@132: Thumbwheel::setValue(int value)
Chris@132: {
Chris@133:     if (m_value == value) return;
Chris@133:     m_atDefault = false;
Chris@133: 
Chris@132:     if (value < m_min) value = m_min;
Chris@132:     if (value > m_max) value = m_max;
Chris@132:     m_value = value;
Chris@132:     update();
Chris@132: }
Chris@132: 
Chris@133: void
Chris@133: Thumbwheel::resetToDefault()
Chris@133: {
Chris@133:     if (m_default == m_value) return;
Chris@133:     setValue(m_default);
Chris@133:     m_atDefault = true;
Chris@133:     emit valueChanged(getValue());
Chris@133: }
Chris@133: 
Chris@132: int
Chris@132: Thumbwheel::getValue() const
Chris@132: {
Chris@132:     return m_value;
Chris@132: }
Chris@132: 
Chris@132: void
Chris@132: Thumbwheel::setSpeed(float speed)
Chris@132: {
Chris@132:     m_speed = speed;
Chris@132: }
Chris@132: 
Chris@132: float
Chris@132: Thumbwheel::getSpeed() const
Chris@132: {
Chris@132:     return m_speed;
Chris@132: }
Chris@132: 
Chris@132: void
Chris@132: Thumbwheel::setTracking(bool tracking)
Chris@132: {
Chris@132:     m_tracking = tracking;
Chris@132: }
Chris@132: 
Chris@132: bool
Chris@132: Thumbwheel::getTracking() const
Chris@132: {
Chris@132:     return m_tracking;
Chris@132: }
Chris@132: 
Chris@132: void
Chris@132: Thumbwheel::setShowScale(bool showScale)
Chris@132: {
Chris@132:     m_showScale = showScale;
Chris@132: }
Chris@132: 
Chris@132: bool
Chris@132: Thumbwheel::getShowScale() const
Chris@132: {
Chris@132:     return m_showScale;
Chris@132: }
Chris@132: 
Chris@132: void
Chris@132: Thumbwheel::mousePressEvent(QMouseEvent *e)
Chris@132: {
Chris@133:     if (e->button() == Qt::LeftButton) {
Chris@133:         m_clicked = true;
Chris@133:         m_clickPos = e->pos();
Chris@133:         m_clickValue = m_value;
Chris@133:     } else if (e->button() == Qt::MidButton) {
Chris@133:         resetToDefault();
Chris@133:     }
Chris@132: }
Chris@132: 
Chris@132: void
Chris@132: Thumbwheel::mouseDoubleClickEvent(QMouseEvent *)
Chris@132: {
Chris@133:     resetToDefault();
Chris@132: }
Chris@132: 
Chris@132: void
Chris@132: Thumbwheel::mouseMoveEvent(QMouseEvent *e)
Chris@132: {
Chris@133:     if (!m_clicked) return;
Chris@132:     int dist = 0;
Chris@132:     if (m_orientation == Qt::Horizontal) {
Chris@132:         dist = e->x() - m_clickPos.x();
Chris@132:     } else {
Chris@132:         dist = e->y() - m_clickPos.y();
Chris@132:     }
Chris@132:     int value = m_clickValue + lrintf(m_speed * dist);
Chris@132:     if (value < m_min) value = m_min;
Chris@132:     if (value > m_max) value = m_max;
Chris@132:     if (value != m_value) {
Chris@132:         setValue(value);
Chris@132:         if (m_tracking) emit valueChanged(getValue());
Chris@132:     }        
Chris@132: }
Chris@132: 
Chris@132: void
Chris@132: Thumbwheel::mouseReleaseEvent(QMouseEvent *e)
Chris@132: {
Chris@133:     if (!m_clicked) return;
Chris@132:     bool reallyTracking = m_tracking;
Chris@132:     m_tracking = true;
Chris@132:     mouseMoveEvent(e);
Chris@132:     m_tracking = reallyTracking;
Chris@133:     m_clicked = false;
Chris@132: }
Chris@132: 
Chris@132: void
Chris@132: Thumbwheel::wheelEvent(QWheelEvent *e)
Chris@132: {
Chris@132:     int step = lrintf(m_speed);
Chris@132:     if (step == 0) step = 1;
Chris@132: 
Chris@132:     if (e->delta() > 0) {
Chris@132: 	setValue(m_value + step);
Chris@132:     } else {
Chris@132: 	setValue(m_value - step);
Chris@132:     }
Chris@132:     
Chris@132:     emit valueChanged(getValue());
Chris@132: }
Chris@132: 
Chris@132: void
Chris@132: Thumbwheel::paintEvent(QPaintEvent *)
Chris@132: {
Chris@133:     QPainter paint(this);
Chris@133:     paint.fillRect(rect(), palette().background().color());
Chris@133:     paint.setRenderHint(QPainter::Antialiasing, false);
Chris@133: 
Chris@133:     int bw = 3;
Chris@133: 
Chris@133:     for (int i = 0; i < bw; ++i) {
Chris@133:         int grey = (i + 1) * (256 / (bw + 1));
Chris@133:         QColor fc = QColor(grey, grey, grey);
Chris@133:         paint.setPen(fc);
Chris@133:         paint.drawRect(i, i, width() - i*2 - 1, height() - i*2 - 1);
Chris@133:     }
Chris@133: 
Chris@133:     paint.setClipRect(QRect(bw, bw, width() - bw*2, height() - bw*2));
Chris@133: 
Chris@132:     float distance = float(m_value - m_min) / float(m_max - m_min);
Chris@132:     float rotation = distance * 1.5f * M_PI;
Chris@132: 
Chris@132: //    std::cerr << "value = " << m_value << ", min = " << m_min << ", max = " << m_max << ", rotation = " << rotation << std::endl;
Chris@132: 
Chris@133:     int w = (m_orientation == Qt::Horizontal ? width() : height()) - bw*2;
Chris@132: 
Chris@132:     // total number of notches on the entire wheel
Chris@132:     int notches = 25;
Chris@132:     
Chris@132:     // radius of the wheel including invisible part
Chris@132:     int radius = w / 2 + 2;
Chris@132: 
Chris@132:     paint.setRenderHint(QPainter::Antialiasing, true);
Chris@132: 
Chris@132:     for (int i = 0; i < notches; ++i) {
Chris@132: 
Chris@132:         float a0 = (2.f * M_PI * i) / notches + rotation;
Chris@132:         float a1 = a0 + M_PI / (notches * 2);
Chris@132:         float a2 = (2.f * M_PI * (i + 1)) / notches + rotation;
Chris@132: 
Chris@132:         float depth = cosf((a0 + a2) / 2);
Chris@132:         if (depth < 0) continue;
Chris@132: 
Chris@132:         float x0 = radius * sinf(a0) + w/2;
Chris@132:         float x1 = radius * sinf(a1) + w/2;
Chris@132:         float x2 = radius * sinf(a2) + w/2;
Chris@132:         if (x2 < 0 || x0 > w) continue;
Chris@132: 
Chris@132:         if (x0 < 0) x0 = 0;
Chris@132:         if (x2 > w) x2 = w;
Chris@132: 
Chris@133:         x0 += bw;
Chris@133:         x1 += bw;
Chris@133:         x2 += bw;
Chris@133: 
Chris@132:         int grey = lrintf(255 * depth);
Chris@132:         QColor fc = QColor(grey, grey, grey);
Chris@132:         QColor oc = palette().dark().color();
Chris@132: 
Chris@132:         paint.setPen(oc);
Chris@132:         paint.setBrush(fc);
Chris@132: 
Chris@132:         if (m_orientation == Qt::Horizontal) {
Chris@133:             paint.drawRect(QRectF(x1, bw, x2 - x1, height() - bw*2));
Chris@132:         } else {
Chris@133:             paint.drawRect(QRectF(bw, x1, width() - bw*2, x2 - x1));
Chris@132:         }
Chris@132: 
Chris@132:         if (m_showScale) {
Chris@132: 
Chris@132:             paint.setBrush(oc);
Chris@132: 
Chris@132:             float prop;
Chris@132:             if (i >= notches / 4) {
Chris@132:                 prop = float(notches - (((i - float(notches) / 4.f) * 4.f) / 3.f))
Chris@132:                     / notches;
Chris@132:             } else {
Chris@132:                 prop = 0.f;
Chris@132:             }
Chris@132:             
Chris@132:             if (m_orientation == Qt::Horizontal) {
Chris@133:                 paint.drawRect(QRectF(x1, height() - (height() - bw*2) * prop - bw,
Chris@132:                                       x2 - x1, height() * prop));
Chris@132:             } else {
Chris@133:                 paint.drawRect(QRectF(bw, x1, (width() - bw*2) * prop, x2 - x1));
Chris@132:             }
Chris@132:         }
Chris@132: 
Chris@132:         paint.setPen(oc);
Chris@132:         paint.setBrush(palette().background().color());
Chris@132: 
Chris@132:         if (m_orientation == Qt::Horizontal) {
Chris@133:             paint.drawRect(QRectF(x0, bw, x1 - x0, height() - bw*2));
Chris@132:         } else {
Chris@133:             paint.drawRect(QRectF(bw, x0, width() - bw*2, x1 - x0));
Chris@132:         }
Chris@132:     }
Chris@132: }
Chris@132: 
Chris@132: QSize
Chris@132: Thumbwheel::sizeHint() const
Chris@132: {
Chris@132:     if (m_orientation == Qt::Horizontal) {
Chris@132:         return QSize(80, 12);
Chris@132:     } else {
Chris@132:         return QSize(12, 80);
Chris@132:     }
Chris@132: }
Chris@132: