comparison layer/NoteLayer.cpp @ 0:fc9323a41f5a

start base : Sonic Visualiser sv1-1.0rc1

+/* -*- 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 "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 <iostream>
+#include <cmath>
+
+NoteLayer::NoteLayer() :
+    Layer(),
+    m_model(0),
+    m_editing(false),
+    m_originalPoint(0, 0.0, 0, tr("New Point")),
+    m_editingPoint(0, 0.0, 0, tr("New Point")),
+    m_editingCommand(0),
+    m_colour(Qt::black),
+    m_verticalScale(AutoAlignScale)
+{
+    
+}
+
+void
+NoteLayer::setModel(NoteModel *model)
+{
+    if (m_model == model) return;
+    m_model = model;
+
+    connect(m_model, SIGNAL(modelChanged()), this, SIGNAL(modelChanged()));
+    connect(m_model, SIGNAL(modelChanged(size_t, size_t)),
+	    this, SIGNAL(modelChanged(size_t, size_t)));
+
+    connect(m_model, SIGNAL(completionChanged()),
+	    this, SIGNAL(modelCompletionChanged()));
+
+//    std::cerr << "NoteLayer::setModel(" << model << ")" << std::endl;
+
+    emit modelReplaced();
+}
+
+Layer::PropertyList
+NoteLayer::getProperties() const
+{
+    PropertyList list;
+    list.push_back("Colour");
+    list.push_back("Vertical Scale");
+    list.push_back("Scale Units");
+    return list;
+}
+
+QString
+NoteLayer::getPropertyLabel(const PropertyName &name) const
+{
+    if (name == "Colour") return tr("Colour");
+    if (name == "Vertical Scale") return tr("Vertical Scale");
+    if (name == "Scale Units") return tr("Scale Units");
+    return "";
+}
+
+Layer::PropertyType
+NoteLayer::getPropertyType(const PropertyName &name) const
+{
+    if (name == "Scale Units") return UnitsProperty;
+    return ValueProperty;
+}
+
+QString
+NoteLayer::getPropertyGroupName(const PropertyName &name) const
+{
+    if (name == "Vertical Scale" || name == "Scale Units") {
+        return tr("Scale");
+    }
+    return QString();
+}
+
+int
+NoteLayer::getPropertyRangeAndValue(const PropertyName &name,
+                                    int *min, int *max, int *deflt) const
+{
+    //!!! factor this colour handling stuff out into a colour manager class
+
+    int val = 0;
+
+    if (name == "Colour") {
+
+	if (min) *min = 0;
+	if (max) *max = 5;
+        if (deflt) *deflt = 0;
+
+	if (m_colour == Qt::black) val = 0;
+	else if (m_colour == Qt::darkRed) val = 1;
+	else if (m_colour == Qt::darkBlue) val = 2;
+	else if (m_colour == Qt::darkGreen) val = 3;
+	else if (m_colour == QColor(200, 50, 255)) val = 4;
+	else if (m_colour == QColor(255, 150, 50)) val = 5;
+
+    } else 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 = Layer::getPropertyRangeAndValue(name, min, max, deflt);
+    }
+
+    return val;
+}
+
+QString
+NoteLayer::getPropertyValueLabel(const PropertyName &name,
+				    int value) const
+{
+    if (name == "Colour") {
+	switch (value) {
+	default:
+	case 0: return tr("Black");
+	case 1: return tr("Red");
+	case 2: return tr("Blue");
+	case 3: return tr("Green");
+	case 4: return tr("Purple");
+	case 5: return tr("Orange");
+	}
+    } else 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 tr("<unknown>");
+}
+
+void
+NoteLayer::setProperty(const PropertyName &name, int value)
+{
+    if (name == "Colour") {
+	switch (value) {
+	default:
+	case 0:	setBaseColour(Qt::black); break;
+	case 1: setBaseColour(Qt::darkRed); break;
+	case 2: setBaseColour(Qt::darkBlue); break;
+	case 3: setBaseColour(Qt::darkGreen); break;
+	case 4: setBaseColour(QColor(200, 50, 255)); break;
+	case 5: setBaseColour(QColor(255, 150, 50)); break;
+	}
+    } else if (name == "Vertical Scale") {
+	setVerticalScale(VerticalScale(value));
+    } else if (name == "Scale Units") {
+        if (m_model) {
+            m_model->setScaleUnits
+                (UnitDatabase::getInstance()->getUnitById(value));
+            emit modelChanged();
+        }
+    }
+}
+
+void
+NoteLayer::setBaseColour(QColor colour)
+{
+    if (m_colour == colour) return;
+    m_colour = colour;
+    emit layerParametersChanged();
+}
+
+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(m_colour);
+
+    QColor brushColour(m_colour);
+    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(m_colour);
+	paint.setBrush(brushColour);
+
+	if (illuminateFrame == p.frame) {
+	    if (localPos.y() >= y - h && localPos.y() < y) {
+		paint.setPen(Qt::black);//!!!
+		paint.setBrush(Qt::black);//!!!
+	    }
+	}
+	
+	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, 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::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;
+}
+
+void
+NoteLayer::editOpen(View *v, QMouseEvent *e)
+{
+    if (!m_model) return;
+
+    NoteModel::PointList points = getLocalPoints(v, e->x());
+    if (points.empty()) return;
+
+    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;
+}
+
+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->label);
+            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->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;
+}
+
+QString
+NoteLayer::toXmlString(QString indent, QString extraAttributes) const
+{
+    return Layer::toXmlString(indent, extraAttributes +
+			      QString(" colour=\"%1\" verticalScale=\"%2\"")
+			      .arg(encodeColour(m_colour)).arg(m_verticalScale));
+}
+
+void
+NoteLayer::setProperties(const QXmlAttributes &attributes)
+{
+    QString colourSpec = attributes.value("colour");
+    if (colourSpec != "") {
+	QColor colour(colourSpec);
+	if (colour.isValid()) {
+	    setBaseColour(QColor(colourSpec));
+	}
+    }
+
+    bool ok;
+    VerticalScale scale = (VerticalScale)
+	attributes.value("verticalScale").toInt(&ok);
+    if (ok) setVerticalScale(scale);
+}
+
+