view data/model/SparseValueModel.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_VALUE_MODEL_H_
#define _SPARSE_VALUE_MODEL_H_

#include "SparseModel.h"
#include "base/UnitDatabase.h"

#include "system/System.h"

/**
 * Model containing sparse data (points with some properties) of which
 * one of the properties is an arbitrary float value.  The other
 * properties depend on the point type.
 */

template <typename PointType>
class SparseValueModel : public SparseModel<PointType>
{
public:
    SparseValueModel(sv_samplerate_t sampleRate, int resolution,
                     bool notifyOnAdd = true) :
        SparseModel<PointType>(sampleRate, resolution, notifyOnAdd),
        m_valueMinimum(0.f),
        m_valueMaximum(0.f),
        m_haveExtents(false)
    { }

    SparseValueModel(sv_samplerate_t sampleRate, int resolution,
                     float valueMinimum, float valueMaximum,
                     bool notifyOnAdd = true) :
        SparseModel<PointType>(sampleRate, resolution, notifyOnAdd),
        m_valueMinimum(valueMinimum),
        m_valueMaximum(valueMaximum),
        m_haveExtents(true)
    { }

    using SparseModel<PointType>::m_points;
    using SparseModel<PointType>::modelChanged;
    using SparseModel<PointType>::getPoints;
    using SparseModel<PointType>::tr;

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

    virtual float getValueMinimum() const { return m_valueMinimum; }
    virtual float getValueMaximum() const { return m_valueMaximum; }

    virtual QString getScaleUnits() const { return m_units; }
    virtual void setScaleUnits(QString units) {
        m_units = units;
        UnitDatabase::getInstance()->registerUnit(units);
    }

    virtual void addPoint(const PointType &point)
    {
        bool allChange = false;

        if (!ISNAN(point.value) && !ISINF(point.value)) {
            if (!m_haveExtents || point.value < m_valueMinimum) {
                m_valueMinimum = point.value; allChange = true;
//                std::cerr << "addPoint: value min = " << m_valueMinimum << std::endl;
            }
            if (!m_haveExtents || point.value > m_valueMaximum) {
                m_valueMaximum = point.value; allChange = true;
//                std::cerr << "addPoint: value max = " << m_valueMaximum << " (min = " << m_valueMinimum << ")" << std::endl;
            }
            m_haveExtents = true;
        }

        SparseModel<PointType>::addPoint(point);
        if (allChange) emit modelChanged();
    }

    virtual void deletePoint(const PointType &point)
    {
        SparseModel<PointType>::deletePoint(point);

        if (point.value == m_valueMinimum ||
            point.value == m_valueMaximum) {

            float formerMin = m_valueMinimum, formerMax = m_valueMaximum;

            for (typename SparseModel<PointType>::PointList::const_iterator i
                     = m_points.begin();
                 i != m_points.end(); ++i) {

                if (i == m_points.begin() || i->value < m_valueMinimum) {
                    m_valueMinimum = i->value;
//                    std::cerr << "deletePoint: value min = " << m_valueMinimum << std::endl;
                } 
                if (i == m_points.begin() || i->value > m_valueMaximum) {
                    m_valueMaximum = i->value;
//                    std::cerr << "deletePoint: value max = " << m_valueMaximum << std::endl;
                } 
            }

            if (formerMin != m_valueMinimum || formerMax != m_valueMaximum) {
                emit modelChanged();
            }
        }
    }

    virtual void toXml(QTextStream &stream,
                       QString indent = "",
                       QString extraAttributes = "") const
    {
        std::cerr << "SparseValueModel::toXml: extraAttributes = \"" 
                  << extraAttributes.toStdString() << std::endl;

        SparseModel<PointType>::toXml
            (stream,
             indent,
             QString("%1 minimum=\"%2\" maximum=\"%3\" units=\"%4\"")
             .arg(extraAttributes).arg(m_valueMinimum).arg(m_valueMaximum)
             .arg(this->encodeEntities(m_units)));
    }

protected:
    float m_valueMinimum;
    float m_valueMaximum;
    bool m_haveExtents;
    QString m_units;
};


#endif