annotate layer/NoteLayer.cpp @ 1447:8afea53332f3 single-point

Add option to make pane sizes auto-resize-only (i.e. remove user control via a splitter); also place alignment views above panes instead of below, meaning the extra bit of space that we currently have for the pane without one at least goes to the primary pane

/* -*- 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 file copyright 2006 Chris Cannam.
    
    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 "NoteLayer.h"

#include "data/model/Model.h"
#include "base/RealTime.h"
#include "base/Profiler.h"
#include "base/Pitch.h"
#include "base/LogRange.h"
#include "base/RangeMapper.h"
#include "view/View.h"

#include "ColourDatabase.h"
#include "PianoScale.h"
#include "LinearNumericalScale.h"
#include "LogNumericalScale.h"
#include "PaintAssistant.h"

#include "data/model/NoteModel.h"

#include "widgets/ItemEditDialog.h"
#include "widgets/TextAbbrev.h"

#include <QPainter>
#include <QPainterPath>
#include <QMouseEvent>
#include <QTextStream>
#include <QMessageBox>

#include <iostream>
#include <cmath>
#include <utility>

//#define DEBUG_NOTE_LAYER 1

NoteLayer::NoteLayer() :
    SingleColourLayer(),
    m_model(nullptr),
    m_editing(false),
    m_dragPointX(0),
    m_dragPointY(0),
    m_dragStartX(0),
    m_dragStartY(0),
    m_originalPoint(0, 0.0, 0, 1.f, tr("New Point")),
    m_editingPoint(0, 0.0, 0, 1.f, tr("New Point")),
    m_editingCommand(nullptr),
    m_editIsOpen(false),
    m_verticalScale(AutoAlignScale),
    m_scaleMinimum(0),
    m_scaleMaximum(0)
{
    SVDEBUG << "constructed NoteLayer" << endl;
}

void
NoteLayer::setModel(NoteModel *model)
{        
    if (m_model == model) return;
    m_model = model;

    connectSignals(m_model);

//    SVDEBUG << "NoteLayer::setModel(" << model << ")" << endl;

    m_scaleMinimum = 0;
    m_scaleMaximum = 0;

    emit modelReplaced();
}

Layer::PropertyList
NoteLayer::getProperties() const
{
    PropertyList list = SingleColourLayer::getProperties();
    list.push_back("Vertical Scale");
    list.push_back("Scale Units");
    return list;
}

QString
NoteLayer::getPropertyLabel(const PropertyName &name) const
{
    if (name == "Vertical Scale") return tr("Vertical Scale");
    if (name == "Scale Units") return tr("Scale Units");
    return SingleColourLayer::getPropertyLabel(name);
}

Layer::PropertyType
NoteLayer::getPropertyType(const PropertyName &name) const
{
    if (name == "Scale Units") return UnitsProperty;
    if (name == "Vertical Scale") return ValueProperty;
    return SingleColourLayer::getPropertyType(name);
}

QString
NoteLayer::getPropertyGroupName(const PropertyName &name) const
{
    if (name == "Vertical Scale" || name == "Scale Units") {
        return tr("Scale");
    }
    return SingleColourLayer::getPropertyGroupName(name);
}

QString
NoteLayer::getScaleUnits() const
{
    if (m_model) return m_model->getScaleUnits();
    else return "";
}

int
NoteLayer::getPropertyRangeAndValue(const PropertyName &name,
                                    int *min, int *max, int *deflt) const
{
    int val = 0;

    if (name == "Vertical Scale") {
        
        if (min) *min = 0;
        if (max) *max = 3;
        if (deflt) *deflt = int(AutoAlignScale);
        
        val = int(m_verticalScale);

    } else if (name == "Scale Units") {

        if (deflt) *deflt = 0;
        if (m_model) {
            val = UnitDatabase::getInstance()->getUnitId
                (getScaleUnits());
        }

    } else {

        val = SingleColourLayer::getPropertyRangeAndValue(name, min, max, deflt);
    }

    return val;
}

QString
NoteLayer::getPropertyValueLabel(const PropertyName &name,
                                 int value) const
{
    if (name == "Vertical Scale") {
        switch (value) {
        default:
        case 0: return tr("Auto-Align");
        case 1: return tr("Linear");
        case 2: return tr("Log");
        case 3: return tr("MIDI Notes");
        }
    }
    return SingleColourLayer::getPropertyValueLabel(name, value);
}

void
NoteLayer::setProperty(const PropertyName &name, int value)
{
    if (name == "Vertical Scale") {
        setVerticalScale(VerticalScale(value));
    } else if (name == "Scale Units") {
        if (m_model) {
            m_model->setScaleUnits
                (UnitDatabase::getInstance()->getUnitById(value));
            emit modelChanged();
        }
    } else {
        return SingleColourLayer::setProperty(name, value);
    }
}

void
NoteLayer::setVerticalScale(VerticalScale scale)
{
    if (m_verticalScale == scale) return;
    m_verticalScale = scale;
    emit layerParametersChanged();
}

bool
NoteLayer::isLayerScrollable(const LayerGeometryProvider *v) const
{
    QPoint discard;
    return !v->shouldIlluminateLocalFeatures(this, discard);
}

bool
NoteLayer::shouldConvertMIDIToHz() const
{
    QString unit = getScaleUnits();
    return (unit != "Hz");
//    if (unit == "" ||
//        unit.startsWith("MIDI") ||
//        unit.startsWith("midi")) return true;
//    return false;
}

bool
NoteLayer::getValueExtents(double &min, double &max,
                           bool &logarithmic, QString &unit) const
{
    if (!m_model) return false;
    min = m_model->getValueMinimum();
    max = m_model->getValueMaximum();

    if (shouldConvertMIDIToHz()) {
        unit = "Hz";
        min = Pitch::getFrequencyForPitch(int(lrint(min)));
        max = Pitch::getFrequencyForPitch(int(lrint(max + 1)));
    } else unit = getScaleUnits();

    if (m_verticalScale == MIDIRangeScale ||
        m_verticalScale == LogScale) logarithmic = true;

    return true;
}

bool
NoteLayer::getDisplayExtents(double &min, double &max) const
{
    if (!m_model || shouldAutoAlign()) return false;

    if (m_verticalScale == MIDIRangeScale) {
        min = Pitch::getFrequencyForPitch(0);
        max = Pitch::getFrequencyForPitch(127);
        return true;
    }

    if (m_scaleMinimum == m_scaleMaximum) {
        min = m_model->getValueMinimum();
        max = m_model->getValueMaximum();
    } else {
        min = m_scaleMinimum;
        max = m_scaleMaximum;
    }

    if (shouldConvertMIDIToHz()) {
        min = Pitch::getFrequencyForPitch(int(lrint(min)));
        max = Pitch::getFrequencyForPitch(int(lrint(max + 1)));
    }

#ifdef DEBUG_NOTE_LAYER
    cerr << "NoteLayer::getDisplayExtents: min = " << min << ", max = " << max << " (m_scaleMinimum = " << m_scaleMinimum << ", m_scaleMaximum = " << m_scaleMaximum << ")" << endl;
#endif

    return true;
}

bool
NoteLayer::setDisplayExtents(double min, double max)
{
    if (!m_model) return false;

    if (min == max) {
        if (min == 0.f) {
            max = 1.f;
        } else {
            max = min * 1.0001;
        }
    }

    m_scaleMinimum = min;
    m_scaleMaximum = max;

#ifdef DEBUG_NOTE_LAYER
    cerr << "NoteLayer::setDisplayExtents: min = " << min << ", max = " << max << endl;
#endif
    
    emit layerParametersChanged();
    return true;
}

int
NoteLayer::getVerticalZoomSteps(int &defaultStep) const
{
    if (shouldAutoAlign()) return 0;
    if (!m_model) return 0;

    defaultStep = 0;
    return 100;
}

int
NoteLayer::getCurrentVerticalZoomStep() const
{
    if (shouldAutoAlign()) return 0;
    if (!m_model) return 0;

    RangeMapper *mapper = getNewVerticalZoomRangeMapper();
    if (!mapper) return 0;

    double dmin, dmax;
    getDisplayExtents(dmin, dmax);

    int nr = mapper->getPositionForValue(dmax - dmin);

    delete mapper;

    return 100 - nr;
}

//!!! lots of duplication with TimeValueLayer

void
NoteLayer::setVerticalZoomStep(int step)
{
    if (shouldAutoAlign()) return;
    if (!m_model) return;

    RangeMapper *mapper = getNewVerticalZoomRangeMapper();
    if (!mapper) return;
    
    double min, max;
    bool logarithmic;
    QString unit;
    getValueExtents(min, max, logarithmic, unit);
    
    double dmin, dmax;
    getDisplayExtents(dmin, dmax);

    double newdist = mapper->getValueForPosition(100 - step);

    double newmin, newmax;

    if (logarithmic) {

        // see SpectrogramLayer::setVerticalZoomStep

        newmax = (newdist + sqrt(newdist*newdist + 4*dmin*dmax)) / 2;
        newmin = newmax - newdist;

//        cerr << "newmin = " << newmin << ", newmax = " << newmax << endl;

    } else {
        double dmid = (dmax + dmin) / 2;
        newmin = dmid - newdist / 2;
        newmax = dmid + newdist / 2;
    }

    if (newmin < min) {
        newmax += (min - newmin);
        newmin = min;
    }
    if (newmax > max) {
        newmax = max;
    }
    
#ifdef DEBUG_NOTE_LAYER
    cerr << "NoteLayer::setVerticalZoomStep: " << step << ": " << newmin << " -> " << newmax << " (range " << newdist << ")" << endl;
#endif

    setDisplayExtents(newmin, newmax);
}

RangeMapper *
NoteLayer::getNewVerticalZoomRangeMapper() const
{
    if (!m_model) return nullptr;
    
    RangeMapper *mapper;

    double min, max;
    bool logarithmic;
    QString unit;
    getValueExtents(min, max, logarithmic, unit);

    if (min == max) return nullptr;
    
    if (logarithmic) {
        mapper = new LogRangeMapper(0, 100, min, max, unit);
    } else {
        mapper = new LinearRangeMapper(0, 100, min, max, unit);
    }

    return mapper;
}

EventVector
NoteLayer::getLocalPoints(LayerGeometryProvider *v, int x) const
{
    if (!m_model) return {};
    
    sv_frame_t frame = v->getFrameForX(x);

    EventVector local = m_model->getEventsCovering(frame);
    if (!local.empty()) return local;

    int fuzz = ViewManager::scalePixelSize(2);
    sv_frame_t start = v->getFrameForX(x - fuzz);
    sv_frame_t end = v->getFrameForX(x + fuzz);

    local = m_model->getEventsStartingWithin(frame, end - frame);
    if (!local.empty()) return local;

    local = m_model->getEventsSpanning(start, frame - start);
    if (!local.empty()) return local;

    return {};
}

bool
NoteLayer::getPointToDrag(LayerGeometryProvider *v, int x, int y, Event &point) const
{
    if (!m_model) return false;

    sv_frame_t frame = v->getFrameForX(x);

    EventVector onPoints = m_model->getEventsCovering(frame);
    if (onPoints.empty()) return false;

    int nearestDistance = -1;
    for (const auto &p: onPoints) {
        int distance = getYForValue(v, p.getValue()) - y;
        if (distance < 0) distance = -distance;
        if (nearestDistance == -1 || distance < nearestDistance) {
            nearestDistance = distance;
            point = p;
        }
    }

    return true;
}

QString
NoteLayer::getFeatureDescription(LayerGeometryProvider *v, QPoint &pos) const
{
    int x = pos.x();

    if (!m_model || !m_model->getSampleRate()) return "";

    EventVector points = getLocalPoints(v, x);

    if (points.empty()) {
        if (!m_model->isReady()) {
            return tr("In progress");
        } else {
            return tr("No local points");
        }
    }

    Event note;
    EventVector::iterator i;

    for (i = points.begin(); i != points.end(); ++i) {

        int y = getYForValue(v, i->getValue());
        int h = 3;

        if (m_model->getValueQuantization() != 0.0) {
            h = y - getYForValue
                (v, i->getValue() + m_model->getValueQuantization());
            if (h < 3) h = 3;
        }

        if (pos.y() >= y - h && pos.y() <= y) {
            note = *i;
            break;
        }
    }

    if (i == points.end()) return tr("No local points");

    RealTime rt = RealTime::frame2RealTime(note.getFrame(),
                                           m_model->getSampleRate());
    RealTime rd = RealTime::frame2RealTime(note.getDuration(),
                                           m_model->getSampleRate());
    
    QString pitchText;

    float value = note.getValue();
    
    if (shouldConvertMIDIToHz()) {

        int mnote = int(lrint(value));
        int cents = int(lrint((value - float(mnote)) * 100));
        double freq = Pitch::getFrequencyForPitch(mnote, cents);
        pitchText = tr("%1 (%2, %3 Hz)")
            .arg(Pitch::getPitchLabel(mnote, cents))
            .arg(mnote)
            .arg(freq);

    } else if (getScaleUnits() == "Hz") {

        pitchText = tr("%1 Hz (%2, %3)")
            .arg(value)
            .arg(Pitch::getPitchLabelForFrequency(value))
            .arg(Pitch::getPitchForFrequency(value));

    } else {
        pitchText = tr("%1 %2")
            .arg(value).arg(getScaleUnits());
    }

    QString text;

    if (note.getLabel() == "") {
        text = QString(tr("Time:\t%1\nPitch:\t%2\nDuration:\t%3\nNo label"))
            .arg(rt.toText(true).c_str())
            .arg(pitchText)
            .arg(rd.toText(true).c_str());
    } else {
        text = QString(tr("Time:\t%1\nPitch:\t%2\nDuration:\t%3\nLabel:\t%4"))
            .arg(rt.toText(true).c_str())
            .arg(pitchText)
            .arg(rd.toText(true).c_str())
            .arg(note.getLabel());
    }

    pos = QPoint(v->getXForFrame(note.getFrame()), getYForValue(v, value));
    return text;
}

bool
NoteLayer::snapToFeatureFrame(LayerGeometryProvider *v, sv_frame_t &frame,
                              int &resolution,
                              SnapType snap) const
{
    if (!m_model) {
        return Layer::snapToFeatureFrame(v, frame, resolution, snap);
    }

    // SnapLeft / SnapRight: return frame of nearest feature in that
    // direction no matter how far away
    //
    // SnapNeighbouring: return frame of feature that would be used in
    // an editing operation, i.e. closest feature in either direction
    // but only if it is "close enough"

    resolution = m_model->getResolution();

    if (snap == SnapNeighbouring) {
        EventVector points = getLocalPoints(v, v->getXForFrame(frame));
        if (points.empty()) return false;
        frame = points.begin()->getFrame();
        return true;
    }    

    Event e;
    if (m_model->getNearestEventMatching
        (frame,
         [](Event) { return true; },
         snap == SnapLeft ? EventSeries::Backward : EventSeries::Forward,
         e)) {
        frame = e.getFrame();
        return true;
    }

    return false;
}

void
NoteLayer::getScaleExtents(LayerGeometryProvider *v, double &min, double &max, bool &log) const
{
    min = 0.0;
    max = 0.0;
    log = false;

    QString queryUnits;
    if (shouldConvertMIDIToHz()) queryUnits = "Hz";
    else queryUnits = getScaleUnits();

    if (shouldAutoAlign()) {

        if (!v->getValueExtents(queryUnits, min, max, log)) {

            min = m_model->getValueMinimum();
            max = m_model->getValueMaximum();

            if (shouldConvertMIDIToHz()) {
                min = Pitch::getFrequencyForPitch(int(lrint(min)));
                max = Pitch::getFrequencyForPitch(int(lrint(max + 1)));
            }

#ifdef DEBUG_NOTE_LAYER
            cerr << "NoteLayer[" << this << "]::getScaleExtents: min = " << min << ", max = " << max << ", log = " << log << endl;
#endif

        } else if (log) {

            LogRange::mapRange(min, max);

#ifdef DEBUG_NOTE_LAYER
            cerr << "NoteLayer[" << this << "]::getScaleExtents: min = " << min << ", max = " << max << ", log = " << log << endl;
#endif

        }

    } else {

        getDisplayExtents(min, max);

        if (m_verticalScale == MIDIRangeScale) {
            min = Pitch::getFrequencyForPitch(0);
            max = Pitch::getFrequencyForPitch(127);
        } else if (shouldConvertMIDIToHz()) {
            min = Pitch::getFrequencyForPitch(int(lrint(min)));
            max = Pitch::getFrequencyForPitch(int(lrint(max + 1)));
        }

        if (m_verticalScale == LogScale || m_verticalScale == MIDIRangeScale) {
            LogRange::mapRange(min, max);
            log = true;
        }
    }

    if (max == min) max = min + 1.0;
}

int
NoteLayer::getYForValue(LayerGeometryProvider *v, double val) const
{
    double min = 0.0, max = 0.0;
    bool logarithmic = false;
    int h = v->getPaintHeight();

    getScaleExtents(v, min, max, logarithmic);

#ifdef DEBUG_NOTE_LAYER
    cerr << "NoteLayer[" << this << "]::getYForValue(" << val << "): min = " << min << ", max = " << max << ", log = " << logarithmic << endl;
#endif

    if (shouldConvertMIDIToHz()) {
        val = Pitch::getFrequencyForPitch(int(lrint(val)),
                                          int(lrint((val - rint(val)) * 100)));
#ifdef DEBUG_NOTE_LAYER
        cerr << "shouldConvertMIDIToHz true, val now = " << val << endl;
#endif
    }

    if (logarithmic) {
        val = LogRange::map(val);
#ifdef DEBUG_NOTE_LAYER
        cerr << "logarithmic true, val now = " << val << endl;
#endif
    }

    int y = int(h - ((val - min) * h) / (max - min)) - 1;
#ifdef DEBUG_NOTE_LAYER
    cerr << "y = " << y << endl;
#endif
    return y;
}

double
NoteLayer::getValueForY(LayerGeometryProvider *v, int y) const
{
    double min = 0.0, max = 0.0;
    bool logarithmic = false;
    int h = v->getPaintHeight();

    getScaleExtents(v, min, max, logarithmic);

    double val = min + (double(h - y) * double(max - min)) / h;

    if (logarithmic) {
        val = pow(10.0, val);
    }

    if (shouldConvertMIDIToHz()) {
        val = Pitch::getPitchForFrequency(val);
    }

    return val;
}

bool
NoteLayer::shouldAutoAlign() const
{
    if (!m_model) return false;
    return (m_verticalScale == AutoAlignScale);
}

void
NoteLayer::paint(LayerGeometryProvider *v, QPainter &paint, QRect rect) const
{
    if (!m_model || !m_model->isOK()) return;

    sv_samplerate_t sampleRate = m_model->getSampleRate();
    if (!sampleRate) return;

//    Profiler profiler("NoteLayer::paint", true);

    int x0 = rect.left(), x1 = rect.right();
    sv_frame_t frame0 = v->getFrameForX(x0);
    sv_frame_t frame1 = v->getFrameForX(x1);

    EventVector points(m_model->getEventsSpanning(frame0, frame1 - frame0));
    if (points.empty()) return;

    paint.setPen(getBaseQColor());

    QColor brushColour(getBaseQColor());
    brushColour.setAlpha(80);

//    SVDEBUG << "NoteLayer::paint: resolution is "
//              << m_model->getResolution() << " frames" << endl;

    double min = m_model->getValueMinimum();
    double max = m_model->getValueMaximum();
    if (max == min) max = min + 1.0;

    QPoint localPos;
    Event illuminatePoint;
    bool shouldIlluminate = false;

    if (v->shouldIlluminateLocalFeatures(this, localPos)) {
        shouldIlluminate = getPointToDrag(v, localPos.x(), localPos.y(),
                                          illuminatePoint);
    } else if (m_editIsOpen) {
        shouldIlluminate = true;
        illuminatePoint = m_editingPoint;
    }

    paint.save();
    paint.setRenderHint(QPainter::Antialiasing, false);
    
    for (EventVector::const_iterator i = points.begin();
         i != points.end(); ++i) {

        const Event &p(*i);

        int x = v->getXForFrame(p.getFrame());
        int y = getYForValue(v, p.getValue());
        int w = v->getXForFrame(p.getFrame() + p.getDuration()) - x;
        int h = 3;
        
        if (m_model->getValueQuantization() != 0.0) {
            h = y - getYForValue(v, p.getValue() + m_model->getValueQuantization());
            if (h < 3) h = 3;
        }

        if (w < 1) w = 1;
        paint.setPen(getBaseQColor());
        paint.setBrush(brushColour);

        if (shouldIlluminate && illuminatePoint == p) {

            paint.setPen(v->getForeground());
            paint.setBrush(v->getForeground());

            QString vlabel = QString("%1%2").arg(p.getValue()).arg(getScaleUnits());
            PaintAssistant::drawVisibleText(v, paint, 
                               x - paint.fontMetrics().width(vlabel) - 2,
                               y + paint.fontMetrics().height()/2
                                 - paint.fontMetrics().descent(), 
                               vlabel, PaintAssistant::OutlinedText);

            QString hlabel = RealTime::frame2RealTime
                (p.getFrame(), m_model->getSampleRate()).toText(true).c_str();
            PaintAssistant::drawVisibleText(v, paint, 
                               x,
                               y - h/2 - paint.fontMetrics().descent() - 2,
                               hlabel, PaintAssistant::OutlinedText);
        }
        
        paint.drawRect(x, y - h/2, w, h);
    }

    paint.restore();
}

int
NoteLayer::getVerticalScaleWidth(LayerGeometryProvider *v, bool, QPainter &paint) const
{
    if (!m_model) {
        return 0;
    }

    if (shouldAutoAlign() && !valueExtentsMatchMine(v)) {
        return 0;
    }

    if (m_verticalScale == LogScale || m_verticalScale == MIDIRangeScale) {
        return LogNumericalScale().getWidth(v, paint) + 10; // for piano
    } else {
        return LinearNumericalScale().getWidth(v, paint);
    }
}

void
NoteLayer::paintVerticalScale(LayerGeometryProvider *v, bool, QPainter &paint, QRect) const
{
    if (!m_model || m_model->isEmpty()) return;

    QString unit;
    double min, max;
    bool logarithmic;

    int w = getVerticalScaleWidth(v, false, paint);
    int h = v->getPaintHeight();

    getScaleExtents(v, min, max, logarithmic);

    if (logarithmic) {
        LogNumericalScale().paintVertical(v, this, paint, 0, min, max);
    } else {
        LinearNumericalScale().paintVertical(v, this, paint, 0, min, max);
    }
    
    if (logarithmic && (getScaleUnits() == "Hz")) {
        PianoScale().paintPianoVertical
            (v, paint, QRect(w - 10, 0, 10, h), 
             LogRange::unmap(min), 
             LogRange::unmap(max));
        paint.drawLine(w, 0, w, h);
    }
        
    if (getScaleUnits() != "") {
        int mw = w - 5;
        paint.drawText(5,
                       5 + paint.fontMetrics().ascent(),
                       TextAbbrev::abbreviate(getScaleUnits(),
                                              paint.fontMetrics(),
                                              mw));
    }
}

void
NoteLayer::drawStart(LayerGeometryProvider *v, QMouseEvent *e)
{
//    SVDEBUG << "NoteLayer::drawStart(" << e->x() << "," << e->y() << ")" << endl;

    if (!m_model) return;

    sv_frame_t frame = v->getFrameForX(e->x());
    if (frame < 0) frame = 0;
    frame = frame / m_model->getResolution() * m_model->getResolution();

    double value = getValueForY(v, e->y());

    m_editingPoint = Event(frame, float(value), 0, 0.8f, tr("New Point"));
    m_originalPoint = m_editingPoint;

    if (m_editingCommand) finish(m_editingCommand);
    m_editingCommand = new ChangeEventsCommand(m_model, tr("Draw Point"));
    m_editingCommand->add(m_editingPoint);

    m_editing = true;
}

void
NoteLayer::drawDrag(LayerGeometryProvider *v, QMouseEvent *e)
{
//    SVDEBUG << "NoteLayer::drawDrag(" << e->x() << "," << e->y() << ")" << endl;

    if (!m_model || !m_editing) return;

    sv_frame_t frame = v->getFrameForX(e->x());
    if (frame < 0) frame = 0;
    frame = frame / m_model->getResolution() * m_model->getResolution();

    double newValue = getValueForY(v, e->y());

    sv_frame_t newFrame = m_editingPoint.getFrame();
    sv_frame_t newDuration = frame - newFrame;
    if (newDuration < 0) {
        newFrame = frame;
        newDuration = -newDuration;
    } else if (newDuration == 0) {
        newDuration = 1;
    }

    m_editingCommand->remove(m_editingPoint);
    m_editingPoint = m_editingPoint
        .withFrame(newFrame)
        .withValue(float(newValue))
        .withDuration(newDuration);
    m_editingCommand->add(m_editingPoint);
}

void
NoteLayer::drawEnd(LayerGeometryProvider *, QMouseEvent *)
{
//    SVDEBUG << "NoteLayer::drawEnd(" << e->x() << "," << e->y() << ")" << endl;
    if (!m_model || !m_editing) return;
    finish(m_editingCommand);
    m_editingCommand = nullptr;
    m_editing = false;
}

void
NoteLayer::eraseStart(LayerGeometryProvider *v, QMouseEvent *e)
{
    if (!m_model) return;

    if (!getPointToDrag(v, e->x(), e->y(), m_editingPoint)) return;

    if (m_editingCommand) {
        finish(m_editingCommand);
        m_editingCommand = nullptr;
    }

    m_editing = true;
}

void
NoteLayer::eraseDrag(LayerGeometryProvider *, QMouseEvent *)
{
}

void
NoteLayer::eraseEnd(LayerGeometryProvider *v, QMouseEvent *e)
{
    if (!m_model || !m_editing) return;

    m_editing = false;

    Event p(0);
    if (!getPointToDrag(v, e->x(), e->y(), p)) return;
    if (p.getFrame() != m_editingPoint.getFrame() ||
        p.getValue() != m_editingPoint.getValue()) return;

    m_editingCommand = new ChangeEventsCommand(m_model, tr("Erase Point"));

    m_editingCommand->remove(m_editingPoint);

    finish(m_editingCommand);
    m_editingCommand = nullptr;
    m_editing = false;
}

void
NoteLayer::editStart(LayerGeometryProvider *v, QMouseEvent *e)
{
//    SVDEBUG << "NoteLayer::editStart(" << e->x() << "," << e->y() << ")" << endl;

    if (!m_model) return;

    if (!getPointToDrag(v, e->x(), e->y(), m_editingPoint)) return;
    m_originalPoint = m_editingPoint;

    m_dragPointX = v->getXForFrame(m_editingPoint.getFrame());
    m_dragPointY = getYForValue(v, m_editingPoint.getValue());

    if (m_editingCommand) {
        finish(m_editingCommand);
        m_editingCommand = nullptr;
    }

    m_editing = true;
    m_dragStartX = e->x();
    m_dragStartY = e->y();
}

void
NoteLayer::editDrag(LayerGeometryProvider *v, QMouseEvent *e)
{
//    SVDEBUG << "NoteLayer::editDrag(" << e->x() << "," << e->y() << ")" << endl;

    if (!m_model || !m_editing) return;

    int xdist = e->x() - m_dragStartX;
    int ydist = e->y() - m_dragStartY;
    int newx = m_dragPointX + xdist;
    int newy = m_dragPointY + ydist;

    sv_frame_t frame = v->getFrameForX(newx);
    if (frame < 0) frame = 0;
    frame = frame / m_model->getResolution() * m_model->getResolution();

    double value = getValueForY(v, newy);

    if (!m_editingCommand) {
        m_editingCommand = new ChangeEventsCommand(m_model,
                                                      tr("Drag Point"));
    }

    m_editingCommand->remove(m_editingPoint);
    m_editingPoint = m_editingPoint
        .withFrame(frame)
        .withValue(float(value));
    m_editingCommand->add(m_editingPoint);
}

void
NoteLayer::editEnd(LayerGeometryProvider *, QMouseEvent *)
{
//    SVDEBUG << "NoteLayer::editEnd(" << e->x() << "," << e->y() << ")" << endl;
    if (!m_model || !m_editing) return;

    if (m_editingCommand) {

        QString newName = m_editingCommand->getName();

        if (m_editingPoint.getFrame() != m_originalPoint.getFrame()) {
            if (m_editingPoint.getValue() != m_originalPoint.getValue()) {
                newName = tr("Edit Point");
            } else {
                newName = tr("Relocate Point");
            }
        } else {
            newName = tr("Change Point Value");
        }

        m_editingCommand->setName(newName);
        finish(m_editingCommand);
    }

    m_editingCommand = nullptr;
    m_editing = false;
}

bool
NoteLayer::editOpen(LayerGeometryProvider *v, QMouseEvent *e)
{
    if (!m_model) return false;

    Event note(0);
    if (!getPointToDrag(v, e->x(), e->y(), note)) return false;

//    Event note = *points.begin();

    ItemEditDialog *dialog = new ItemEditDialog
        (m_model->getSampleRate(),
         ItemEditDialog::ShowTime |
         ItemEditDialog::ShowDuration |
         ItemEditDialog::ShowValue |
         ItemEditDialog::ShowText,
         getScaleUnits());

    dialog->setFrameTime(note.getFrame());
    dialog->setValue(note.getValue());
    dialog->setFrameDuration(note.getDuration());
    dialog->setText(note.getLabel());

    m_editingPoint = note;
    m_editIsOpen = true;
    
    if (dialog->exec() == QDialog::Accepted) {

        Event newNote = note
            .withFrame(dialog->getFrameTime())
            .withValue(dialog->getValue())
            .withDuration(dialog->getFrameDuration())
            .withLabel(dialog->getText());
        
        ChangeEventsCommand *command = new ChangeEventsCommand
            (m_model, tr("Edit Point"));
        command->remove(note);
        command->add(newNote);
        finish(command);
    }

    m_editingPoint = 0;
    m_editIsOpen = false;
        
    delete dialog;
    return true;
}

void
NoteLayer::moveSelection(Selection s, sv_frame_t newStartFrame)
{
    if (!m_model) return;

    ChangeEventsCommand *command =
        new ChangeEventsCommand(m_model, tr("Drag Selection"));

    EventVector points =
        m_model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());

    for (Event p: points) {
        command->remove(p);
        Event moved = p.withFrame(p.getFrame() +
                                  newStartFrame - s.getStartFrame());
        command->add(moved);
    }

    finish(command);
}

void
NoteLayer::resizeSelection(Selection s, Selection newSize)
{
    if (!m_model || !s.getDuration()) return;

    ChangeEventsCommand *command =
        new ChangeEventsCommand(m_model, tr("Resize Selection"));

    EventVector points =
        m_model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());

    double ratio = double(newSize.getDuration()) / double(s.getDuration());
    double oldStart = double(s.getStartFrame());
    double newStart = double(newSize.getStartFrame());
    
    for (Event p: points) {

        double newFrame = (double(p.getFrame()) - oldStart) * ratio + newStart;
        double newDuration = double(p.getDuration()) * ratio;

        Event newPoint = p
            .withFrame(lrint(newFrame))
            .withDuration(lrint(newDuration));
        command->remove(p);
        command->add(newPoint);
    }

    finish(command);
}

void
NoteLayer::deleteSelection(Selection s)
{
    if (!m_model) return;

    ChangeEventsCommand *command =
        new ChangeEventsCommand(m_model, tr("Delete Selected Points"));

    EventVector points =
        m_model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());

    for (Event p: points) {
        command->remove(p);
    }

    finish(command);
}    

void
NoteLayer::copy(LayerGeometryProvider *v, Selection s, Clipboard &to)
{
    if (!m_model) return;

    EventVector points =
        m_model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());

    for (Event p: points) {
        to.addPoint(p.withReferenceFrame(alignToReference(v, p.getFrame())));
    }
}

bool
NoteLayer::paste(LayerGeometryProvider *v, const Clipboard &from,
                 sv_frame_t /* frameOffset */, bool /* interactive */)
{
    if (!m_model) return false;

    const EventVector &points = from.getPoints();

    bool realign = false;

    if (clipboardHasDifferentAlignment(v, from)) {

        QMessageBox::StandardButton button =
            QMessageBox::question(v->getView(), tr("Re-align pasted items?"),
                                  tr("The items you are pasting came from a layer with different source material from this one.  Do you want to re-align them in time, to match the source material for this layer?"),
                                  QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel,
                                  QMessageBox::Yes);

        if (button == QMessageBox::Cancel) {
            return false;
        }

        if (button == QMessageBox::Yes) {
            realign = true;
        }
    }

    ChangeEventsCommand *command =
        new ChangeEventsCommand(m_model, tr("Paste"));

    for (EventVector::const_iterator i = points.begin();
         i != points.end(); ++i) {

        sv_frame_t frame = 0;

        if (!realign) {
            
            frame = i->getFrame();

        } else {

            if (i->hasReferenceFrame()) {
                frame = i->getReferenceFrame();
                frame = alignFromReference(v, frame);
            } else {
                frame = i->getFrame();
            }
        }

        Event p = *i;
        Event newPoint = p;
        if (!p.hasValue()) {
            newPoint = newPoint.withValue((m_model->getValueMinimum() +
                                           m_model->getValueMaximum()) / 2);
        }
        if (!p.hasDuration()) {
            sv_frame_t nextFrame = frame;
            EventVector::const_iterator j = i;
            for (; j != points.end(); ++j) {
                if (j != i) break;
            }
            if (j != points.end()) {
                nextFrame = j->getFrame();
            }
            if (nextFrame == frame) {
                newPoint = newPoint.withDuration(m_model->getResolution());
            } else {
                newPoint = newPoint.withDuration(nextFrame - frame);
            }
        }
        
        command->add(newPoint);
    }

    finish(command);
    return true;
}

void
NoteLayer::addNoteOn(sv_frame_t frame, int pitch, int velocity)
{
    m_pendingNoteOns.insert(Event(frame, float(pitch), 0,
                                  float(velocity) / 127.f, QString()));
}

void
NoteLayer::addNoteOff(sv_frame_t frame, int pitch)
{
    for (NoteSet::iterator i = m_pendingNoteOns.begin();
         i != m_pendingNoteOns.end(); ++i) {

        Event p = *i;

        if (lrintf(p.getValue()) == pitch) {
            m_pendingNoteOns.erase(i);
            Event note = p.withDuration(frame - p.getFrame());
            if (m_model) {
                ChangeEventsCommand *c = new ChangeEventsCommand
                    (m_model, tr("Record Note"));
                c->add(note);
                // execute and bundle:
                CommandHistory::getInstance()->addCommand(c, true, true);
            }
            break;
        }
    }
}

void
NoteLayer::abandonNoteOns()
{
    m_pendingNoteOns.clear();
}

int
NoteLayer::getDefaultColourHint(bool darkbg, bool &impose)
{
    impose = false;
    return ColourDatabase::getInstance()->getColourIndex
        (QString(darkbg ? "White" : "Black"));
}

void
NoteLayer::toXml(QTextStream &stream,
                 QString indent, QString extraAttributes) const
{
    SingleColourLayer::toXml(stream, indent, extraAttributes +
                             QString(" verticalScale=\"%1\" scaleMinimum=\"%2\" scaleMaximum=\"%3\" ")
                             .arg(m_verticalScale)
                             .arg(m_scaleMinimum)
                             .arg(m_scaleMaximum));
}

void
NoteLayer::setProperties(const QXmlAttributes &attributes)
{
    SingleColourLayer::setProperties(attributes);

    bool ok, alsoOk;
    VerticalScale scale = (VerticalScale)
        attributes.value("verticalScale").toInt(&ok);
    if (ok) setVerticalScale(scale);

    float min = attributes.value("scaleMinimum").toFloat(&ok);
    float max = attributes.value("scaleMaximum").toFloat(&alsoOk);
    if (ok && alsoOk && min != max) setDisplayExtents(min, max);
}