comparison layer/BoxLayer.cpp @ 1518:2e94c268f7a0 time-frequency-boxes

Rename TimeFrequencyBoxLayer to just BoxLayer, supporting vertical scales other than Hz

+/* -*- 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 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 "BoxLayer.h"
+
+#include "data/model/Model.h"
+#include "base/RealTime.h"
+#include "base/Profiler.h"
+#include "base/LogRange.h"
+
+#include "ColourDatabase.h"
+#include "ColourMapper.h"
+#include "LinearNumericalScale.h"
+#include "LogNumericalScale.h"
+#include "PaintAssistant.h"
+
+#include "view/View.h"
+
+#include "data/model/BoxModel.h"
+
+#include "widgets/ItemEditDialog.h"
+#include "widgets/TextAbbrev.h"
+
+#include <QPainter>
+#include <QPainterPath>
+#include <QMouseEvent>
+#include <QTextStream>
+#include <QMessageBox>
+
+#include <iostream>
+#include <cmath>
+
+BoxLayer::BoxLayer() :
+    SingleColourLayer(),
+    m_editing(false),
+    m_dragPointX(0),
+    m_dragPointY(0),
+    m_dragStartX(0),
+    m_dragStartY(0),
+    m_originalPoint(0, 0.0, 0, tr("New Box")),
+    m_editingPoint(0, 0.0, 0, tr("New Box")),
+    m_editingCommand(nullptr),
+    m_verticalScale(AutoAlignScale)
+{
+    
+}
+
+int
+BoxLayer::getCompletion(LayerGeometryProvider *) const
+{
+    auto model = ModelById::get(m_model);
+    if (model) return model->getCompletion();
+    else return 0;
+}
+
+void
+BoxLayer::setModel(ModelId modelId)
+{
+    auto oldModel = ModelById::getAs<BoxModel>(m_model);
+    auto newModel = ModelById::getAs<BoxModel>(modelId);
+    
+    if (!modelId.isNone() && !newModel) {
+        throw std::logic_error("Not a BoxModel");
+    }
+    
+    if (m_model == modelId) return;
+    m_model = modelId;
+
+    if (newModel) {
+        connectSignals(m_model);
+    }
+    
+    emit modelReplaced();
+}
+
+Layer::PropertyList
+BoxLayer::getProperties() const
+{
+    PropertyList list = SingleColourLayer::getProperties();
+    list.push_back("Vertical Scale");
+    list.push_back("Scale Units");
+    return list;
+}
+
+QString
+BoxLayer::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
+BoxLayer::getPropertyType(const PropertyName &name) const
+{
+    if (name == "Vertical Scale") return ValueProperty;
+    if (name == "Scale Units") return UnitsProperty;
+    return SingleColourLayer::getPropertyType(name);
+}
+
+QString
+BoxLayer::getPropertyGroupName(const PropertyName &name) const
+{
+    if (name == "Vertical Scale" || name == "Scale Units") {
+        return tr("Scale");
+    }
+    return SingleColourLayer::getPropertyGroupName(name);
+}
+
+int
+BoxLayer::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 = 2;
+        if (deflt) *deflt = int(LinearScale);
+        
+        val = int(m_verticalScale);
+
+    } else if (name == "Scale Units") {
+
+        if (deflt) *deflt = 0;
+        auto model = ModelById::getAs<BoxModel>(m_model);
+        if (model) {
+            val = UnitDatabase::getInstance()->getUnitId
+                (model->getScaleUnits());
+        }
+
+    } else {
+        val = SingleColourLayer::getPropertyRangeAndValue(name, min, max, deflt);
+    }
+
+    return val;
+}
+
+QString
+BoxLayer::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");
+        }
+    }
+    return SingleColourLayer::getPropertyValueLabel(name, value);
+}
+
+void
+BoxLayer::setProperty(const PropertyName &name, int value)
+{
+    if (name == "Vertical Scale") {
+        setVerticalScale(VerticalScale(value));
+    } else if (name == "Scale Units") {
+        auto model = ModelById::getAs<BoxModel>(m_model);
+        if (model) {
+            model->setScaleUnits
+                (UnitDatabase::getInstance()->getUnitById(value));
+            emit modelChanged(m_model);
+        }
+    } else {
+        return SingleColourLayer::setProperty(name, value);
+    }
+}
+
+void
+BoxLayer::setVerticalScale(VerticalScale scale)
+{
+    if (m_verticalScale == scale) return;
+    m_verticalScale = scale;
+    emit layerParametersChanged();
+}
+
+bool
+BoxLayer::isLayerScrollable(const LayerGeometryProvider *v) const
+{
+    QPoint discard;
+    return !v->shouldIlluminateLocalFeatures(this, discard);
+}
+
+bool
+BoxLayer::getValueExtents(double &min, double &max,
+                          bool &logarithmic, QString &unit) const
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return false;
+    min = model->getValueMinimum();
+    max = model->getValueMaximum();
+    unit = getScaleUnits();
+
+    if (m_verticalScale == LogScale) logarithmic = true;
+
+    return true;
+}
+
+bool
+BoxLayer::getDisplayExtents(double &min, double &max) const
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model || m_verticalScale == AutoAlignScale) return false;
+
+    min = model->getValueMinimum();
+    max = model->getValueMaximum();
+
+    return true;
+}
+
+bool
+BoxLayer::adoptExtents(double min, double max, QString unit)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return false;
+    if (model->getScaleUnits() == "") {
+        model->setScaleUnits(unit);
+        return true;
+    } else {
+        return false;
+    }
+}
+
+EventVector
+BoxLayer::getLocalPoints(LayerGeometryProvider *v, int x) const
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return EventVector();
+
+    sv_frame_t frame = v->getFrameForX(x);
+
+    EventVector local = 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 = model->getEventsStartingWithin(frame, end - frame);
+    if (!local.empty()) return local;
+
+    local = model->getEventsSpanning(start, frame - start);
+    if (!local.empty()) return local;
+
+    return {};
+}
+
+bool
+BoxLayer::getPointToDrag(LayerGeometryProvider *v, int x, int y,
+                                      Event &point) const
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return false;
+
+    sv_frame_t frame = v->getFrameForX(x);
+
+    EventVector onPoints = 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
+BoxLayer::getLabelPreceding(sv_frame_t frame) const
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return "";
+    EventVector points = model->getEventsStartingWithin
+        (model->getStartFrame(), frame - model->getStartFrame());
+    if (!points.empty()) {
+        for (auto i = points.rbegin(); i != points.rend(); ++i) {
+            if (i->getLabel() != QString()) {
+                return i->getLabel();
+            }
+        }
+    }
+    return QString();
+}
+
+QString
+BoxLayer::getFeatureDescription(LayerGeometryProvider *v,
+                                             QPoint &pos) const
+{
+    int x = pos.x();
+
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model || !model->getSampleRate()) return "";
+
+    EventVector points = getLocalPoints(v, x);
+
+    if (points.empty()) {
+        if (!model->isReady()) {
+            return tr("In progress");
+        } else {
+            return tr("No local points");
+        }
+    }
+
+    Event box;
+    EventVector::iterator i;
+
+    for (i = points.begin(); i != points.end(); ++i) {
+
+        int y0 = getYForValue(v, i->getValue());
+        int y1 = getYForValue(v, i->getValue() + fabsf(i->getLevel()));
+
+        if (pos.y() >= y0 && pos.y() <= y1) {
+            box = *i;
+            break;
+        }
+    }
+
+    if (i == points.end()) return tr("No local points");
+
+    RealTime rt = RealTime::frame2RealTime(box.getFrame(),
+                                           model->getSampleRate());
+    RealTime rd = RealTime::frame2RealTime(box.getDuration(),
+                                           model->getSampleRate());
+    
+    QString rangeText;
+
+    rangeText = tr("%1 %2 - %3 %4")
+        .arg(box.getValue()).arg(getScaleUnits())
+        .arg(box.getValue() + fabsf(box.getLevel())).arg(getScaleUnits());
+
+    QString text;
+
+    if (box.getLabel() == "") {
+        text = QString(tr("Time:\t%1\nDuration:\t%2\nValue:\t%3\nNo label"))
+            .arg(rt.toText(true).c_str())
+            .arg(rd.toText(true).c_str())
+            .arg(rangeText);
+    } else {
+        text = QString(tr("Time:\t%1\nDuration:\t%2\nValue:\t%3\nLabel:\t%4"))
+            .arg(rt.toText(true).c_str())
+            .arg(rd.toText(true).c_str())
+            .arg(rangeText)
+            .arg(box.getLabel());
+    }
+
+    pos = QPoint(v->getXForFrame(box.getFrame()),
+                 getYForValue(v, box.getValue()));
+    return text;
+}
+
+bool
+BoxLayer::snapToFeatureFrame(LayerGeometryProvider *v,
+                                          sv_frame_t &frame,
+                                          int &resolution,
+                                          SnapType snap) const
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!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 = model->getResolution();
+
+    if (snap == SnapNeighbouring) {
+        EventVector points = getLocalPoints(v, v->getXForFrame(frame));
+        if (points.empty()) return false;
+        frame = points.begin()->getFrame();
+        return true;
+    }    
+
+    // Normally we snap to the start frame of whichever event we
+    // find. However here, for SnapRight only, if the end frame of
+    // whichever event we would have snapped to had we been snapping
+    // left is closer than the start frame of the next event to the
+    // right, then we snap to that frame instead. Clear?
+    
+    Event left;
+    bool haveLeft = false;
+    if (model->getNearestEventMatching
+        (frame, [](Event) { return true; }, EventSeries::Backward, left)) {
+        haveLeft = true;
+    }
+
+    if (snap == SnapLeft) {
+        frame = left.getFrame();
+        return haveLeft;
+    }
+
+    Event right;
+    bool haveRight = false;
+    if (model->getNearestEventMatching
+        (frame, [](Event) { return true; }, EventSeries::Forward, right)) {
+        haveRight = true;
+    }
+
+    if (haveLeft) {
+        sv_frame_t leftEnd = left.getFrame() + left.getDuration();
+        if (leftEnd > frame) {
+            if (haveRight) {
+                if (leftEnd - frame < right.getFrame() - frame) {
+                    frame = leftEnd;
+                } else {
+                    frame = right.getFrame();
+                }
+            } else {
+                frame = leftEnd;
+            }
+            return true;
+        }
+    }
+
+    if (haveRight) {
+        frame = right.getFrame();
+        return true;
+    }
+
+    return false;
+}
+
+QString
+BoxLayer::getScaleUnits() const
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (model) return model->getScaleUnits();
+    else return "";
+}
+
+void
+BoxLayer::getScaleExtents(LayerGeometryProvider *v,
+                                       double &min, double &max,
+                                       bool &log) const
+{
+    min = 0.0;
+    max = 0.0;
+    log = false;
+
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return;
+
+    QString queryUnits;
+    queryUnits = getScaleUnits();
+
+    if (m_verticalScale == AutoAlignScale) {
+
+        if (!v->getValueExtents(queryUnits, min, max, log)) {
+
+            min = model->getValueMinimum();
+            max = model->getValueMaximum();
+
+//            cerr << "BoxLayer[" << this << "]::getScaleExtents: min = " << min << ", max = " << max << ", log = " << log << endl;
+
+        } else if (log) {
+
+            LogRange::mapRange(min, max);
+
+//            cerr << "BoxLayer[" << this << "]::getScaleExtents: min = " << min << ", max = " << max << ", log = " << log << endl;
+
+        }
+
+    } else {
+
+        min = model->getValueMinimum();
+        max = model->getValueMaximum();
+
+        if (m_verticalScale == LogScale) {
+            LogRange::mapRange(min, max);
+            log = true;
+        }
+    }
+
+    if (max == min) max = min + 1.0;
+}
+
+int
+BoxLayer::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);
+
+//    cerr << "BoxLayer[" << this << "]::getYForValue(" << val << "): min = " << min << ", max = " << max << ", log = " << logarithmic << endl;
+//    cerr << "h = " << h << ", margin = " << margin << endl;
+
+    if (logarithmic) {
+        val = LogRange::map(val);
+    }
+
+    return int(h - ((val - min) * h) / (max - min));
+}
+
+double
+BoxLayer::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);
+    }
+
+    return val;
+}
+
+void
+BoxLayer::paint(LayerGeometryProvider *v, QPainter &paint,
+                             QRect rect) const
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model || !model->isOK()) return;
+
+    sv_samplerate_t sampleRate = model->getSampleRate();
+    if (!sampleRate) return;
+
+//    Profiler profiler("BoxLayer::paint", true);
+
+    int x0 = rect.left() - 40, x1 = rect.right();
+
+    sv_frame_t wholeFrame0 = v->getFrameForX(0);
+    sv_frame_t wholeFrame1 = v->getFrameForX(v->getPaintWidth());
+
+    EventVector points(model->getEventsSpanning(wholeFrame0,
+                                                wholeFrame1 - wholeFrame0));
+    if (points.empty()) return;
+
+    paint.setPen(getBaseQColor());
+
+//    SVDEBUG << "BoxLayer::paint: resolution is "
+//              << model->getResolution() << " frames" << endl;
+
+    double min = model->getValueMinimum();
+    double max = model->getValueMaximum();
+    if (max == min) max = min + 1.0;
+
+    QPoint localPos;
+    Event illuminatePoint(0);
+    bool shouldIlluminate = false;
+
+    if (v->shouldIlluminateLocalFeatures(this, localPos)) {
+        shouldIlluminate = getPointToDrag(v, localPos.x(), localPos.y(),
+                                          illuminatePoint);
+    }
+
+    paint.save();
+    paint.setRenderHint(QPainter::Antialiasing, false);
+
+    QFontMetrics fm = paint.fontMetrics();
+        
+    for (EventVector::const_iterator i = points.begin();
+         i != points.end(); ++i) {
+
+        const Event &p(*i);
+
+        int x = v->getXForFrame(p.getFrame());
+        int w = v->getXForFrame(p.getFrame() + p.getDuration()) - x;
+        int y = getYForValue(v, p.getValue());
+        int h = getYForValue(v, p.getValue() + fabsf(p.getLevel())) - y;
+        int ex = x + w;
+        int gap = v->scalePixelSize(2);
+
+        EventVector::const_iterator j = i;
+        ++j;
+
+        if (j != points.end()) {
+            const Event &q(*j);
+            int nx = v->getXForFrame(q.getFrame());
+            if (nx < ex) ex = nx;
+        }
+
+        if (w < 1) w = 1;
+
+        paint.setPen(getBaseQColor());
+        paint.setBrush(Qt::NoBrush);
+
+        if ((shouldIlluminate && illuminatePoint == p) ||
+            (m_editing && m_editingPoint == p)) {
+
+            paint.setPen(QPen(getBaseQColor(), v->scalePixelSize(2)));
+                
+            // Qt 5.13 deprecates QFontMetrics::width(), but its suggested
+            // replacement (horizontalAdvance) was only added in Qt 5.11
+            // which is too new for us
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
+            if (abs(h) > 2 * fm.height()) {
+            
+                QString y0label = QString("%1 %2")
+                    .arg(p.getValue())
+                    .arg(getScaleUnits());
+
+                QString y1label = QString("%1 %2")
+                    .arg(p.getValue() + fabsf(p.getLevel()))
+                    .arg(getScaleUnits());
+
+                PaintAssistant::drawVisibleText
+                    (v, paint, 
+                     x - fm.width(y0label) - gap,
+                     y - fm.descent(), 
+                     y0label, PaintAssistant::OutlinedText);
+
+                PaintAssistant::drawVisibleText
+                    (v, paint, 
+                     x - fm.width(y1label) - gap,
+                     y + h + fm.ascent(), 
+                     y1label, PaintAssistant::OutlinedText);
+
+            } else {
+            
+                QString ylabel = QString("%1 %2 - %3 %4")
+                    .arg(p.getValue())
+                    .arg(getScaleUnits())
+                    .arg(p.getValue() + fabsf(p.getLevel()))
+                    .arg(getScaleUnits());
+
+                PaintAssistant::drawVisibleText
+                    (v, paint, 
+                     x - fm.width(ylabel) - gap,
+                     y - fm.descent(), 
+                     ylabel, PaintAssistant::OutlinedText);
+            }
+            
+            QString t0label = RealTime::frame2RealTime
+                (p.getFrame(), model->getSampleRate()).toText(true).c_str();
+
+            QString t1label = RealTime::frame2RealTime
+                (p.getFrame() + p.getDuration(), model->getSampleRate())
+                .toText(true).c_str();
+
+            PaintAssistant::drawVisibleText
+                (v, paint, x, y + fm.ascent() + gap,
+                 t0label, PaintAssistant::OutlinedText);
+
+            if (w > fm.width(t0label) + fm.width(t1label) + gap * 3) {
+
+                PaintAssistant::drawVisibleText
+                    (v, paint,
+                     x + w - fm.width(t1label),
+                     y + fm.ascent() + gap,
+                     t1label, PaintAssistant::OutlinedText);
+
+            } else {
+
+                PaintAssistant::drawVisibleText
+                    (v, paint,
+                     x + w - fm.width(t1label),
+                     y + fm.ascent() + fm.height() + gap,
+                     t1label, PaintAssistant::OutlinedText);
+            }                
+        }
+
+        paint.drawRect(x, y, w, h);
+    }
+
+    for (EventVector::const_iterator i = points.begin();
+         i != points.end(); ++i) {
+
+        const Event &p(*i);
+
+        QString label = p.getLabel();
+        if (label == "") continue;
+
+        if (shouldIlluminate && illuminatePoint == p) {
+            continue; // already handled this in illumination special case
+        }
+        
+        int x = v->getXForFrame(p.getFrame());
+        int w = v->getXForFrame(p.getFrame() + p.getDuration()) - x;
+        int y = getYForValue(v, p.getValue());
+
+        int labelWidth = fm.width(label);
+
+        int gap = v->scalePixelSize(2);
+
+        if (x + w < x0 || x - labelWidth - gap > x1) {
+            continue;
+        }
+        
+        int labelX, labelY;
+
+        labelX = x - labelWidth - gap;
+        labelY = y - fm.descent();
+
+        PaintAssistant::drawVisibleText(v, paint, labelX, labelY, label,
+                                        PaintAssistant::OutlinedText);
+    }
+
+    paint.restore();
+}
+
+int
+BoxLayer::getVerticalScaleWidth(LayerGeometryProvider *v,
+                                             bool, QPainter &paint) const
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model || m_verticalScale == AutoAlignScale) {
+        return 0;
+    } else {
+        if (m_verticalScale == LogScale) {
+            return LogNumericalScale().getWidth(v, paint);
+        } else {
+            return LinearNumericalScale().getWidth(v, paint);
+        }
+    }
+}
+
+void
+BoxLayer::paintVerticalScale(LayerGeometryProvider *v,
+                                          bool, QPainter &paint, QRect) const
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model || model->isEmpty()) return;
+
+    QString unit;
+    double min, max;
+    bool logarithmic;
+
+    int w = getVerticalScaleWidth(v, false, paint);
+
+    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 (getScaleUnits() != "") {
+        int mw = w - 5;
+        paint.drawText(5,
+                       5 + paint.fontMetrics().ascent(),
+                       TextAbbrev::abbreviate(getScaleUnits(),
+                                              paint.fontMetrics(),
+                                              mw));
+    }
+}
+
+void
+BoxLayer::drawStart(LayerGeometryProvider *v, QMouseEvent *e)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return;
+
+    sv_frame_t frame = v->getFrameForX(e->x());
+    if (frame < 0) frame = 0;
+    frame = frame / model->getResolution() * model->getResolution();
+
+    double value = getValueForY(v, e->y());
+
+    m_editingPoint = Event(frame, float(value), 0, "");
+    m_originalPoint = m_editingPoint;
+
+    if (m_editingCommand) finish(m_editingCommand);
+    m_editingCommand = new ChangeEventsCommand(m_model.untyped,
+                                               tr("Draw Box"));
+    m_editingCommand->add(m_editingPoint);
+
+    m_editing = true;
+}
+
+void
+BoxLayer::drawDrag(LayerGeometryProvider *v, QMouseEvent *e)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model || !m_editing) return;
+
+    sv_frame_t dragFrame = v->getFrameForX(e->x());
+    if (dragFrame < 0) dragFrame = 0;
+    dragFrame = dragFrame / model->getResolution() * model->getResolution();
+
+    sv_frame_t eventFrame = m_originalPoint.getFrame();
+    sv_frame_t eventDuration = dragFrame - eventFrame;
+    if (eventDuration < 0) {
+        eventFrame = eventFrame + eventDuration;
+        eventDuration = -eventDuration;
+    } else if (eventDuration == 0) {
+        eventDuration = model->getResolution();
+    }
+
+    double dragValue = getValueForY(v, e->y());
+
+    double eventValue = m_originalPoint.getValue();
+    double eventFreqDiff = dragValue - eventValue;
+    if (eventFreqDiff < 0) {
+        eventValue = eventValue + eventFreqDiff;
+        eventFreqDiff = -eventFreqDiff;
+    }
+
+    m_editingCommand->remove(m_editingPoint);
+    m_editingPoint = m_editingPoint
+        .withFrame(eventFrame)
+        .withDuration(eventDuration)
+        .withValue(float(eventValue))
+        .withLevel(float(eventFreqDiff));
+    m_editingCommand->add(m_editingPoint);
+}
+
+void
+BoxLayer::drawEnd(LayerGeometryProvider *, QMouseEvent *)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model || !m_editing) return;
+    finish(m_editingCommand);
+    m_editingCommand = nullptr;
+    m_editing = false;
+}
+
+void
+BoxLayer::eraseStart(LayerGeometryProvider *v, QMouseEvent *e)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!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
+BoxLayer::eraseDrag(LayerGeometryProvider *, QMouseEvent *)
+{
+}
+
+void
+BoxLayer::eraseEnd(LayerGeometryProvider *v, QMouseEvent *e)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!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.untyped, tr("Erase Box"));
+
+    m_editingCommand->remove(m_editingPoint);
+
+    finish(m_editingCommand);
+    m_editingCommand = nullptr;
+    m_editing = false;
+}
+
+void
+BoxLayer::editStart(LayerGeometryProvider *v, QMouseEvent *e)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return;
+
+    if (!getPointToDrag(v, e->x(), e->y(), m_editingPoint)) {
+        return;
+    }
+
+    m_dragPointX = v->getXForFrame(m_editingPoint.getFrame());
+    m_dragPointY = getYForValue(v, m_editingPoint.getValue());
+
+    m_originalPoint = m_editingPoint;
+
+    if (m_editingCommand) {
+        finish(m_editingCommand);
+        m_editingCommand = nullptr;
+    }
+
+    m_editing = true;
+    m_dragStartX = e->x();
+    m_dragStartY = e->y();
+}
+
+void
+BoxLayer::editDrag(LayerGeometryProvider *v, QMouseEvent *e)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!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 / model->getResolution() * model->getResolution();
+
+    double value = getValueForY(v, newy);
+
+    if (!m_editingCommand) {
+        m_editingCommand = new ChangeEventsCommand
+            (m_model.untyped,
+             tr("Drag Box"));
+    }
+
+    m_editingCommand->remove(m_editingPoint);
+    m_editingPoint = m_editingPoint
+        .withFrame(frame)
+        .withValue(float(value));
+    m_editingCommand->add(m_editingPoint);
+}
+
+void
+BoxLayer::editEnd(LayerGeometryProvider *, QMouseEvent *)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!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 Box");
+            } else {
+                newName = tr("Relocate Box");
+            }
+        } else {
+            newName = tr("Change Point Value");
+        }
+
+        m_editingCommand->setName(newName);
+        finish(m_editingCommand);
+    }
+
+    m_editingCommand = nullptr;
+    m_editing = false;
+}
+
+bool
+BoxLayer::editOpen(LayerGeometryProvider *v, QMouseEvent *e)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return false;
+
+    Event region(0);
+    if (!getPointToDrag(v, e->x(), e->y(), region)) return false;
+
+    ItemEditDialog::LabelOptions labelOptions;
+    labelOptions.valueLabel = tr("Minimum Value");
+    labelOptions.levelLabel = tr("Value Extent");
+    labelOptions.valueUnits = getScaleUnits();
+    labelOptions.levelUnits = getScaleUnits();
+    
+    ItemEditDialog *dialog = new ItemEditDialog
+        (model->getSampleRate(),
+         ItemEditDialog::ShowTime |
+         ItemEditDialog::ShowDuration |
+         ItemEditDialog::ShowValue |
+         ItemEditDialog::ShowLevel |
+         ItemEditDialog::ShowText,
+         labelOptions);
+
+    dialog->setFrameTime(region.getFrame());
+    dialog->setValue(region.getValue());
+    dialog->setLevel(region.getLevel());
+    dialog->setFrameDuration(region.getDuration());
+    dialog->setText(region.getLabel());
+
+    if (dialog->exec() == QDialog::Accepted) {
+
+        Event newBox = region
+            .withFrame(dialog->getFrameTime())
+            .withValue(dialog->getValue())
+            .withLevel(dialog->getLevel())
+            .withDuration(dialog->getFrameDuration())
+            .withLabel(dialog->getText());
+        
+        ChangeEventsCommand *command = new ChangeEventsCommand
+            (m_model.untyped, tr("Edit Box"));
+        command->remove(region);
+        command->add(newBox);
+        finish(command);
+    }
+
+    delete dialog;
+    return true;
+}
+
+void
+BoxLayer::moveSelection(Selection s, sv_frame_t newStartFrame)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return;
+
+    ChangeEventsCommand *command =
+        new ChangeEventsCommand(m_model.untyped, tr("Drag Selection"));
+
+    EventVector points =
+        model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());
+
+    for (EventVector::iterator i = points.begin();
+         i != points.end(); ++i) {
+
+        Event newPoint = (*i)
+            .withFrame(i->getFrame() + newStartFrame - s.getStartFrame());
+        command->remove(*i);
+        command->add(newPoint);
+    }
+
+    finish(command);
+}
+
+void
+BoxLayer::resizeSelection(Selection s, Selection newSize)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model || !s.getDuration()) return;
+
+    ChangeEventsCommand *command =
+        new ChangeEventsCommand(m_model.untyped, tr("Resize Selection"));
+
+    EventVector points =
+        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
+BoxLayer::deleteSelection(Selection s)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return;
+
+    ChangeEventsCommand *command =
+        new ChangeEventsCommand(m_model.untyped, tr("Delete Selected Points"));
+
+    EventVector points =
+        model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());
+
+    for (EventVector::iterator i = points.begin();
+         i != points.end(); ++i) {
+
+        if (s.contains(i->getFrame())) {
+            command->remove(*i);
+        }
+    }
+
+    finish(command);
+}    
+
+void
+BoxLayer::copy(LayerGeometryProvider *v, Selection s, Clipboard &to)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!model) return;
+
+    EventVector points =
+        model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());
+
+    for (Event p: points) {
+        to.addPoint(p.withReferenceFrame(alignToReference(v, p.getFrame())));
+    }
+}
+
+bool
+BoxLayer::paste(LayerGeometryProvider *v, const Clipboard &from, sv_frame_t /* frameOffset */, bool /* interactive */)
+{
+    auto model = ModelById::getAs<BoxModel>(m_model);
+    if (!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.untyped, 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((model->getValueMinimum() +
+                                           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(model->getResolution());
+            } else {
+                newPoint = newPoint.withDuration(nextFrame - frame);
+            }
+        }
+        
+        command->add(newPoint);
+    }
+
+    finish(command);
+    return true;
+}
+
+void
+BoxLayer::toXml(QTextStream &stream,
+                             QString indent, QString extraAttributes) const
+{
+    QString s;
+
+    s += QString("verticalScale=\"%1\" ").arg(m_verticalScale);
+    
+    SingleColourLayer::toXml(stream, indent, extraAttributes + " " + s);
+}
+
+void
+BoxLayer::setProperties(const QXmlAttributes &attributes)
+{
+    SingleColourLayer::setProperties(attributes);
+
+    bool ok;
+    VerticalScale scale = (VerticalScale)
+        attributes.value("verticalScale").toInt(&ok);
+    if (ok) setVerticalScale(scale);
+}
+
+