view layer/NoteLayer.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 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/ColourDatabase.h"
#include "view/View.h"

#include "data/model/NoteModel.h"

#include "widgets/ItemEditDialog.h"

#include "SpectrogramLayer.h" // for optional frequency alignment

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

#include <iostream>
#include <cmath>

NoteLayer::NoteLayer() :
    SingleColourLayer(),
    m_model(0),
    m_editing(false),
    m_originalPoint(0, 0.0, 0, 1.f, tr("New Point")),
    m_editingPoint(0, 0.0, 0, 1.f, tr("New Point")),
    m_editingCommand(0),
    m_verticalScale(AutoAlignScale)
{
    
}

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

    connectSignals(m_model);

//    std::cerr << "NoteLayer::setModel(" << model << ")" << std::endl;

    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);
}

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
                (m_model->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 View *v) const
{
    QPoint discard;
    return !v->shouldIlluminateLocalFeatures(this, discard);
}

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

bool
NoteLayer::getValueExtents(float &min, float &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(lrintf(min));
        max = Pitch::getFrequencyForPitch(lrintf(max + 1));
    } else unit = m_model->getScaleUnits();

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

    return true;
}

bool
NoteLayer::getDisplayExtents(float &min, float &max) const
{
    if (!m_model || m_verticalScale == AutoAlignScale) return false;

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

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

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

    return true;
}

NoteModel::PointList
NoteLayer::getLocalPoints(View *v, int x) const
{
    if (!m_model) return NoteModel::PointList();

    long frame = v->getFrameForX(x);

    NoteModel::PointList onPoints =
	m_model->getPoints(frame);

    if (!onPoints.empty()) {
	return onPoints;
    }

    NoteModel::PointList prevPoints =
	m_model->getPreviousPoints(frame);
    NoteModel::PointList nextPoints =
	m_model->getNextPoints(frame);

    NoteModel::PointList usePoints = prevPoints;

    if (prevPoints.empty()) {
	usePoints = nextPoints;
    } else if (long(prevPoints.begin()->frame) < v->getStartFrame() &&
	       !(nextPoints.begin()->frame > v->getEndFrame())) {
	usePoints = nextPoints;
    } else if (long(nextPoints.begin()->frame) - frame <
	       frame - long(prevPoints.begin()->frame)) {
	usePoints = nextPoints;
    }

    if (!usePoints.empty()) {
	int fuzz = 2;
	int px = v->getXForFrame(usePoints.begin()->frame);
	if ((px > x && px - x > fuzz) ||
	    (px < x && x - px > fuzz + 1)) {
	    usePoints.clear();
	}
    }

    return usePoints;
}

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

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

    NoteModel::PointList points = getLocalPoints(v, x);

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

    Note note(0);
    NoteModel::PointList::iterator i;

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

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

	if (m_model->getValueQuantization() != 0.0) {
	    h = y - getYForValue(v, i->value + 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.frame,
					   m_model->getSampleRate());
    RealTime rd = RealTime::frame2RealTime(note.duration,
					   m_model->getSampleRate());
    
    QString pitchText;

    if (shouldConvertMIDIToHz()) {

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

    } else if (m_model->getScaleUnits() == "Hz") {

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

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

    QString text;

    if (note.label == "") {
	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.label);
    }

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

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

    resolution = m_model->getResolution();
    NoteModel::PointList points;

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

    points = m_model->getPoints(frame, frame);
    int snapped = frame;
    bool found = false;

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

	if (snap == SnapRight) {

	    if (i->frame > frame) {
		snapped = i->frame;
		found = true;
		break;
	    }

	} else if (snap == SnapLeft) {

	    if (i->frame <= frame) {
		snapped = i->frame;
		found = true; // don't break, as the next may be better
	    } else {
		break;
	    }

	} else { // nearest

	    NoteModel::PointList::const_iterator j = i;
	    ++j;

	    if (j == points.end()) {

		snapped = i->frame;
		found = true;
		break;

	    } else if (j->frame >= frame) {

		if (j->frame - frame < frame - i->frame) {
		    snapped = j->frame;
		} else {
		    snapped = i->frame;
		}
		found = true;
		break;
	    }
	}
    }

    frame = snapped;
    return found;
}

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

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

    if (m_verticalScale == AutoAlignScale) {

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

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

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

            std::cerr << "NoteLayer[" << this << "]::getScaleExtents: min = " << min << ", max = " << max << ", log = " << log << std::endl;

        } else if (log) {

            LogRange::mapRange(min, max);

            std::cerr << "NoteLayer[" << this << "]::getScaleExtents: min = " << min << ", max = " << max << ", log = " << log << std::endl;

        }

    } else {

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

        if (m_verticalScale == MIDIRangeScale) {
            min = Pitch::getFrequencyForPitch(0);
            max = Pitch::getFrequencyForPitch(127);
        } else if (shouldConvertMIDIToHz()) {
            min = Pitch::getFrequencyForPitch(lrintf(min));
            max = Pitch::getFrequencyForPitch(lrintf(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(View *v, float val) const
{
    float min = 0.0, max = 0.0;
    bool logarithmic = false;
    int h = v->height();

    getScaleExtents(v, min, max, logarithmic);

//    std::cerr << "NoteLayer[" << this << "]::getYForValue(" << val << "): min = " << min << ", max = " << max << ", log = " << logarithmic << std::endl;

    if (shouldConvertMIDIToHz()) {
        val = Pitch::getFrequencyForPitch(lrintf(val),
                                          lrintf((val - lrintf(val)) * 100));
//        std::cerr << "shouldConvertMIDIToHz true, val now = " << val << std::endl;
    }

    if (logarithmic) {
        val = LogRange::map(val);
//        std::cerr << "logarithmic true, val now = " << val << std::endl;
    }

    int y = int(h - ((val - min) * h) / (max - min)) - 1;
//    std::cerr << "y = " << y << std::endl;
    return y;
}

float
NoteLayer::getValueForY(View *v, int y) const
{
    float min = 0.0, max = 0.0;
    bool logarithmic = false;
    int h = v->height();

    getScaleExtents(v, min, max, logarithmic);

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

    if (logarithmic) {
        val = powf(10.f, val);
    }

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

    return val;
}

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

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

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

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

    NoteModel::PointList points(m_model->getPoints(frame0, frame1));
    if (points.empty()) return;

    paint.setPen(getBaseQColor());

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

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

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

    QPoint localPos;
    long illuminateFrame = -1;

    if (v->shouldIlluminateLocalFeatures(this, localPos)) {
	NoteModel::PointList localPoints =
	    getLocalPoints(v, localPos.x());
	if (!localPoints.empty()) illuminateFrame = localPoints.begin()->frame;
    }

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

	const NoteModel::Point &p(*i);

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

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

	if (illuminateFrame == p.frame) {
	    if (localPos.y() >= y - h && localPos.y() < y) {
		paint.setPen(v->getForeground());
		paint.setBrush(v->getForeground());
	    }
	}
	
	paint.drawRect(x, y - h/2, w, h);

///	if (p.label != "") {
///	    paint.drawText(x + 5, y - paint.fontMetrics().height() + paint.fontMetrics().ascent(), p.label);
///	}
    }

    paint.restore();
}

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

    if (!m_model) return;

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

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

    m_editingPoint = NoteModel::Point(frame, value, 0, 0.8, tr("New Point"));
    m_originalPoint = m_editingPoint;

    if (m_editingCommand) m_editingCommand->finish();
    m_editingCommand = new NoteModel::EditCommand(m_model,
						  tr("Draw Point"));
    m_editingCommand->addPoint(m_editingPoint);

    m_editing = true;
}

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

    if (!m_model || !m_editing) return;

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

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

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

    m_editingCommand->deletePoint(m_editingPoint);
    m_editingPoint.frame = newFrame;
    m_editingPoint.value = newValue;
    m_editingPoint.duration = newDuration;
    m_editingCommand->addPoint(m_editingPoint);
}

void
NoteLayer::drawEnd(View *, QMouseEvent *)
{
//    std::cerr << "NoteLayer::drawEnd(" << e->x() << "," << e->y() << ")" << std::endl;
    if (!m_model || !m_editing) return;
    m_editingCommand->finish();
    m_editingCommand = 0;
    m_editing = false;
}

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

    NoteModel::PointList points = getLocalPoints(v, e->x());
    if (points.empty()) return;

    m_editingPoint = *points.begin();

    if (m_editingCommand) {
	m_editingCommand->finish();
	m_editingCommand = 0;
    }

    m_editing = true;
}

void
NoteLayer::eraseDrag(View *v, QMouseEvent *e)
{
}

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

    m_editing = false;

    NoteModel::PointList points = getLocalPoints(v, e->x());
    if (points.empty()) return;
    if (points.begin()->frame != m_editingPoint.frame ||
        points.begin()->value != m_editingPoint.value) return;

    m_editingCommand = new NoteModel::EditCommand
        (m_model, tr("Erase Point"));

    m_editingCommand->deletePoint(m_editingPoint);

    m_editingCommand->finish();
    m_editingCommand = 0;
    m_editing = false;
}

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

    if (!m_model) return;

    NoteModel::PointList points = getLocalPoints(v, e->x());
    if (points.empty()) return;

    m_editingPoint = *points.begin();
    m_originalPoint = m_editingPoint;

    if (m_editingCommand) {
	m_editingCommand->finish();
	m_editingCommand = 0;
    }

    m_editing = true;
}

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

    if (!m_model || !m_editing) return;

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

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

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

    m_editingCommand->deletePoint(m_editingPoint);
    m_editingPoint.frame = frame;
    m_editingPoint.value = value;
    m_editingCommand->addPoint(m_editingPoint);
}

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

    if (m_editingCommand) {

	QString newName = m_editingCommand->getName();

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

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

    m_editingCommand = 0;
    m_editing = false;
}

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

    NoteModel::PointList points = getLocalPoints(v, e->x());
    if (points.empty()) return false;

    NoteModel::Point note = *points.begin();

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

    dialog->setFrameTime(note.frame);
    dialog->setValue(note.value);
    dialog->setFrameDuration(note.duration);
    dialog->setText(note.label);

    if (dialog->exec() == QDialog::Accepted) {

        NoteModel::Point newNote = note;
        newNote.frame = dialog->getFrameTime();
        newNote.value = dialog->getValue();
        newNote.duration = dialog->getFrameDuration();
        newNote.label = dialog->getText();
        
        NoteModel::EditCommand *command = new NoteModel::EditCommand
            (m_model, tr("Edit Point"));
        command->deletePoint(note);
        command->addPoint(newNote);
        command->finish();
    }

    delete dialog;
    return true;
}

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

    NoteModel::EditCommand *command =
	new NoteModel::EditCommand(m_model, tr("Drag Selection"));

    NoteModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

    for (NoteModel::PointList::iterator i = points.begin();
	 i != points.end(); ++i) {

	if (s.contains(i->frame)) {
	    NoteModel::Point newPoint(*i);
	    newPoint.frame = i->frame + newStartFrame - s.getStartFrame();
	    command->deletePoint(*i);
	    command->addPoint(newPoint);
	}
    }

    command->finish();
}

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

    NoteModel::EditCommand *command =
	new NoteModel::EditCommand(m_model, tr("Resize Selection"));

    NoteModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

    double ratio =
	double(newSize.getEndFrame() - newSize.getStartFrame()) /
	double(s.getEndFrame() - s.getStartFrame());

    for (NoteModel::PointList::iterator i = points.begin();
	 i != points.end(); ++i) {

	if (s.contains(i->frame)) {

	    double targetStart = i->frame;
	    targetStart = newSize.getStartFrame() + 
		double(targetStart - s.getStartFrame()) * ratio;

	    double targetEnd = i->frame + i->duration;
	    targetEnd = newSize.getStartFrame() +
		double(targetEnd - s.getStartFrame()) * ratio;

	    NoteModel::Point newPoint(*i);
	    newPoint.frame = lrint(targetStart);
	    newPoint.duration = lrint(targetEnd - targetStart);
	    command->deletePoint(*i);
	    command->addPoint(newPoint);
	}
    }

    command->finish();
}

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

    NoteModel::EditCommand *command =
	new NoteModel::EditCommand(m_model, tr("Delete Selected Points"));

    NoteModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

    for (NoteModel::PointList::iterator i = points.begin();
	 i != points.end(); ++i) {

        if (s.contains(i->frame)) {
            command->deletePoint(*i);
        }
    }

    command->finish();
}    

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

    NoteModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

    for (NoteModel::PointList::iterator i = points.begin();
	 i != points.end(); ++i) {
	if (s.contains(i->frame)) {
            Clipboard::Point point(i->frame, i->value, i->duration, i->level, i->label);
            point.setReferenceFrame(m_model->alignToReference(i->frame));
            to.addPoint(point);
        }
    }
}

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

    const Clipboard::PointList &points = from.getPoints();

    NoteModel::EditCommand *command =
	new NoteModel::EditCommand(m_model, tr("Paste"));

    for (Clipboard::PointList::const_iterator i = points.begin();
         i != points.end(); ++i) {
        
        if (!i->haveFrame()) continue;
        size_t frame = 0;
        if (frameOffset > 0 || -frameOffset < i->getFrame()) {
            frame = i->getFrame() + frameOffset;
        }
        NoteModel::Point newPoint(frame);
  
        if (i->haveLabel()) newPoint.label = i->getLabel();
        if (i->haveValue()) newPoint.value = i->getValue();
        else newPoint.value = (m_model->getValueMinimum() +
                               m_model->getValueMaximum()) / 2;
        if (i->haveLevel()) newPoint.level = i->getLevel();
        if (i->haveDuration()) newPoint.duration = i->getDuration();
        else {
            size_t nextFrame = frame;
            Clipboard::PointList::const_iterator j = i;
            for (; j != points.end(); ++j) {
                if (!j->haveFrame()) continue;
                if (j != i) break;
            }
            if (j != points.end()) {
                nextFrame = j->getFrame();
            }
            if (nextFrame == frame) {
                newPoint.duration = m_model->getResolution();
            } else {
                newPoint.duration = nextFrame - frame;
            }
        }
        
        command->addPoint(newPoint);
    }

    command->finish();
    return true;
}

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\"")
                             .arg(m_verticalScale));
}

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

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