view layer/NoteLayer.h @ 1551:e79731086b0f

Fixes to NoteLayer, particularly to calculation of vertical scale when model unit is not Hz. To avoid inconsistency we now behave as if the unit is always Hz from the point of view of the external API and display, converting at the point where we obtain values from the events themselves. Also various fixes to editing.

/* -*- 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.
*/

#ifndef SV_NOTE_LAYER_H
#define SV_NOTE_LAYER_H

#include "SingleColourLayer.h"
#include "VerticalScaleLayer.h"

#include "data/model/NoteModel.h"

#include <QObject>
#include <QColor>

class View;
class QPainter;

/**
 * Layer for displaying and editing notes, i.e. discrete events with
 * start time, duration, value that represents pitch, and optionally a
 * level that represents velocity.
 *
 * For the purposes of public API, integration with other classes, and
 * display alignment, the y-coordinate (value) of the layer always has
 * a unit of Hz. The model itself may have another unit, such as MIDI
 * pitch, but the layer always converts to and from Hz behind the
 * scenes.
 */
class NoteLayer : public SingleColourLayer,
                  public VerticalScaleLayer
{
    Q_OBJECT

public:
    NoteLayer();

    void paint(LayerGeometryProvider *v, QPainter &paint, QRect rect) const override;

    int getVerticalScaleWidth(LayerGeometryProvider *v, bool, QPainter &) const override;
    void paintVerticalScale(LayerGeometryProvider *v, bool, QPainter &paint, QRect rect) const override;

    QString getFeatureDescription(LayerGeometryProvider *v, QPoint &) const override;

    bool snapToFeatureFrame(LayerGeometryProvider *v, sv_frame_t &frame,
                            int &resolution,
                            SnapType snap, int ycoord) const override;

    void drawStart(LayerGeometryProvider *v, QMouseEvent *) override;
    void drawDrag(LayerGeometryProvider *v, QMouseEvent *) override;
    void drawEnd(LayerGeometryProvider *v, QMouseEvent *) override;

    void eraseStart(LayerGeometryProvider *v, QMouseEvent *) override;
    void eraseDrag(LayerGeometryProvider *v, QMouseEvent *) override;
    void eraseEnd(LayerGeometryProvider *v, QMouseEvent *) override;

    void editStart(LayerGeometryProvider *v, QMouseEvent *) override;
    void editDrag(LayerGeometryProvider *v, QMouseEvent *) override;
    void editEnd(LayerGeometryProvider *v, QMouseEvent *) override;

    bool editOpen(LayerGeometryProvider *v, QMouseEvent *) override;

    void moveSelection(Selection s, sv_frame_t newStartFrame) override;
    void resizeSelection(Selection s, Selection newSize) override;
    void deleteSelection(Selection s) override;

    void copy(LayerGeometryProvider *v, Selection s, Clipboard &to) override;
    bool paste(LayerGeometryProvider *v, const Clipboard &from,
               sv_frame_t frameOffset, bool interactive) override;

    ModelId getModel() const override { return m_model; }
    void setModel(ModelId model); // a NoteModel

    PropertyList getProperties() const override;
    QString getPropertyLabel(const PropertyName &) const override;
    PropertyType getPropertyType(const PropertyName &) const override;
    QString getPropertyGroupName(const PropertyName &) const override;
    int getPropertyRangeAndValue(const PropertyName &,
                                 int *min, int *max, int *deflt) const override;
    QString getPropertyValueLabel(const PropertyName &,
                                  int value) const override;
    void setProperty(const PropertyName &, int value) override;

    enum VerticalScale {
        AutoAlignScale,
        LinearScale,
        LogScale,
        MIDIRangeScale
    };

    void setVerticalScale(VerticalScale scale);
    VerticalScale getVerticalScale() const { return m_verticalScale; }

    bool isLayerScrollable(const LayerGeometryProvider *v) const override;

    bool isLayerEditable() const override { return true; }

    int getCompletion(LayerGeometryProvider *) const override;

    bool getValueExtents(double &min, double &max,
                         bool &log, QString &unit) const override;

    bool getDisplayExtents(double &min, double &max) const override;
    bool setDisplayExtents(double min, double max) override;

    int getVerticalZoomSteps(int &defaultStep) const override;
    int getCurrentVerticalZoomStep() const override;
    void setVerticalZoomStep(int) override;
    RangeMapper *getNewVerticalZoomRangeMapper() const override;

    /**
     * Add a note-on.  Used when recording MIDI "live".  The note will
     * not be finally added to the layer until the corresponding
     * note-off.
     */
    void addNoteOn(sv_frame_t frame, int pitch, int velocity);
    
    /**
     * Add a note-off.  This will cause a note to appear, if and only
     * if there is a matching pending note-on.
     */
    void addNoteOff(sv_frame_t frame, int pitch);

    /**
     * Abandon all pending note-on events.
     */
    void abandonNoteOns();

    void toXml(QTextStream &stream, QString indent = "",
                       QString extraAttributes = "") const override;

    void setProperties(const QXmlAttributes &attributes) override;

    /// VerticalScaleLayer methods
    int getYForValue(LayerGeometryProvider *v, double value) const override;
    double getValueForY(LayerGeometryProvider *v, int y) const override;
    QString getScaleUnits() const override;

protected:
    void getScaleExtents(LayerGeometryProvider *, double &min, double &max, bool &log) const;

    int getDefaultColourHint(bool dark, bool &impose) override;

    EventVector getLocalPoints(LayerGeometryProvider *v, int) const;

    bool getPointToDrag(LayerGeometryProvider *v, int x, int y, Event &) const;

    double convertValueFromEventValue(float eventValue) const;
    float convertValueToEventValue(double value) const;
    
    double valueOf(const Event &e) const;
    Event eventWithValue(const Event &e, double value) const;
    
    ModelId m_model;
    bool m_modelUsesHz;
    bool m_editing;
    int m_dragPointX;
    int m_dragPointY;
    int m_dragStartX;
    int m_dragStartY;
    Event m_originalPoint;
    Event m_editingPoint;
    ChangeEventsCommand *m_editingCommand;
    bool m_editIsOpen;
    VerticalScale m_verticalScale;

    typedef std::set<Event> NoteSet;
    NoteSet m_pendingNoteOns;

    mutable double m_scaleMinimum;
    mutable double m_scaleMaximum;

    bool shouldAutoAlign() const;

    void finish(ChangeEventsCommand *command) {
        Command *c = command->finish();
        if (c) CommandHistory::getInstance()->addCommand(c, false);
    }
};

#endif