view data/model/SparseTimeValueModel.h @ 1455:ec9e65fcf749

The use of the begin/end pairs here just seems to cause too many rows to be deleted (from the visual representation, not the underlying model). Things apparently work better if we just modify the underlying model and let the change signals percolate back up again. To that end, update the change handlers so as to cover their proper ranges with dataChanged signals.

/* -*- 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 _SPARSE_TIME_VALUE_MODEL_H_
#define _SPARSE_TIME_VALUE_MODEL_H_

#include "SparseValueModel.h"
#include "base/PlayParameterRepository.h"
#include "base/RealTime.h"

/**
 * Time/value point type for use in a SparseModel or SparseValueModel.
 * With this point type, the model basically represents a wiggly-line
 * plot with points at arbitrary intervals of the model resolution.
 */

struct TimeValuePoint
{
public:
    TimeValuePoint(sv_frame_t _frame) : frame(_frame), value(0.0f) { }
    TimeValuePoint(sv_frame_t _frame, float _value, QString _label) : 
        frame(_frame), value(_value), label(_label) { }

    int getDimensions() const { return 2; }
    
    sv_frame_t frame;
    float value;
    QString label;

    QString getLabel() const { return label; }
    
    void toXml(QTextStream &stream, QString indent = "",
               QString extraAttributes = "") const
    {
        stream << QString("%1<point frame=\"%2\" value=\"%3\" label=\"%4\" %5/>\n")
            .arg(indent).arg(frame).arg(value).arg(XmlExportable::encodeEntities(label))
            .arg(extraAttributes);
    }

    QString toDelimitedDataString(QString delimiter, DataExportOptions, sv_samplerate_t sampleRate) const
    {
        QStringList list;
        list << RealTime::frame2RealTime(frame, sampleRate).toString().c_str();
        list << QString("%1").arg(value);
        if (label != "") list << label;
        return list.join(delimiter);
    }

    struct Comparator {
        bool operator()(const TimeValuePoint &p1,
                        const TimeValuePoint &p2) const {
            if (p1.frame != p2.frame) return p1.frame < p2.frame;
            if (p1.value != p2.value) return p1.value < p2.value;
            return p1.label < p2.label;
        }
    };
    
    struct OrderComparator {
        bool operator()(const TimeValuePoint &p1,
                        const TimeValuePoint &p2) const {
            return p1.frame < p2.frame;
        }
    };
};


class SparseTimeValueModel : public SparseValueModel<TimeValuePoint>
{
    Q_OBJECT
    
public:
    SparseTimeValueModel(sv_samplerate_t sampleRate, int resolution,
                         bool notifyOnAdd = true) :
        SparseValueModel<TimeValuePoint>(sampleRate, resolution,
                                         notifyOnAdd)
    {
        // Model is playable, but may not sound (if units not Hz or
        // range unsuitable)
        PlayParameterRepository::getInstance()->addPlayable(this);
    }

    SparseTimeValueModel(sv_samplerate_t sampleRate, int resolution,
                         float valueMinimum, float valueMaximum,
                         bool notifyOnAdd = true) :
        SparseValueModel<TimeValuePoint>(sampleRate, resolution,
                                         valueMinimum, valueMaximum,
                                         notifyOnAdd)
    {
        // Model is playable, but may not sound (if units not Hz or
        // range unsuitable)
        PlayParameterRepository::getInstance()->addPlayable(this);
    }

    virtual ~SparseTimeValueModel()
    {
        PlayParameterRepository::getInstance()->removePlayable(this);
    }

    QString getTypeName() const { return tr("Sparse Time-Value"); }

    virtual bool canPlay() const { return true; }
    virtual bool getDefaultPlayAudible() const { return false; } // user must unmute

    /**
     * TabularModel methods.  
     */
    
    virtual int getColumnCount() const
    {
        return 4;
    }

    virtual QString getHeading(int column) const
    {
        switch (column) {
        case 0: return tr("Time");
        case 1: return tr("Frame");
        case 2: return tr("Value");
        case 3: return tr("Label");
        default: return tr("Unknown");
        }
    }

    virtual QVariant getData(int row, int column, int role) const
    {
        if (column < 2) {
            return SparseValueModel<TimeValuePoint>::getData
                (row, column, role);
        }

        PointListConstIterator i = getPointListIteratorForRow(row);
        if (i == m_points.end()) return QVariant();

        switch (column) {
        case 2:
            if (role == Qt::EditRole || role == SortRole) return i->value;
            else return QString("%1 %2").arg(i->value).arg(getScaleUnits());
        case 3: return i->label;
        default: return QVariant();
        }
    }

    virtual Command *getSetDataCommand(int row, int column, const QVariant &value, int role)
    {
        if (column < 2) {
            return SparseValueModel<TimeValuePoint>::getSetDataCommand
                (row, column, value, role);
        }

        if (role != Qt::EditRole) return 0;
        PointListConstIterator i = getPointListIteratorForRow(row);
        if (i == m_points.end()) return 0;
        EditCommand *command = new EditCommand(this, tr("Edit Data"));

        Point point(*i);
        command->deletePoint(point);

        switch (column) {
        case 2: point.value = float(value.toDouble()); break;
        case 3: point.label = value.toString(); break;
        }

        command->addPoint(point);
        return command->finish();
    }

    virtual bool isColumnTimeValue(int column) const
    {
        return (column < 2); 
    }

    virtual SortType getSortType(int column) const
    {
        if (column == 3) return SortAlphabetical;
        return SortNumeric;
    }
};


#endif