view data/model/ImageModel.h @ 1008:d9e0e59a1581

When using an aggregate model to pass data to a transform, zero-pad the shorter input to the duration of the longer rather than truncating the longer. (This is better behaviour for e.g. MATCH, and in any case the code was previously truncating incorrectly and ending up with garbage data at the end.)

/* -*- 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 2006-2007 Chris Cannam and QMUL.
    
    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 _IMAGE_MODEL_H_
#define _IMAGE_MODEL_H_

#include "SparseModel.h"
#include "base/XmlExportable.h"
#include "base/RealTime.h"

#include <QStringList>

/**
 * Image point type for use in a SparseModel.  This represents an
 * image, identified by filename, at a given time.  The filename can
 * be empty, in which case we instead have a space to put an image in.
 */

struct ImagePoint : public XmlExportable
{
public:
    ImagePoint(long _frame) : frame(_frame) { }
    ImagePoint(long _frame, QString _image, QString _label) :
        frame(_frame), image(_image), label(_label) { }

    int getDimensions() const { return 1; }
    
    long frame;
    QString image;
    QString label;

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

    QString toDelimitedDataString(QString delimiter, int sampleRate) const
    {
        QStringList list;
        list << RealTime::frame2RealTime(frame, sampleRate).toString().c_str();
        list << image;
        if (label != "") list << label;
        return list.join(delimiter);
    }

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


// Make this a class rather than a typedef so it can be predeclared.

class ImageModel : public SparseModel<ImagePoint>
{
    Q_OBJECT

public:
    ImageModel(int sampleRate, int resolution, bool notifyOnAdd = true) :
	SparseModel<ImagePoint>(sampleRate, resolution, notifyOnAdd)
    { }

    QString getTypeName() const { return tr("Image"); }

    virtual void toXml(QTextStream &out,
                       QString indent = "",
                       QString extraAttributes = "") const
    {
        SparseModel<ImagePoint>::toXml
	    (out, 
             indent,
	     QString("%1 subtype=\"image\"")
	     .arg(extraAttributes));
    }

    /**
     * Command to change the image for a point.
     */
    class ChangeImageCommand : public Command
    {
    public:
        ChangeImageCommand(ImageModel *model,
                           const ImagePoint &point,
                           QString newImage,
                           QString newLabel) :
	    m_model(model), m_oldPoint(point), m_newPoint(point) {
	    m_newPoint.image = newImage;
            m_newPoint.label = newLabel;
	}

	virtual QString getName() const { return tr("Edit Image"); }

	virtual void execute() { 
	    m_model->deletePoint(m_oldPoint);
	    m_model->addPoint(m_newPoint);
	    std::swap(m_oldPoint, m_newPoint);
	}

	virtual void unexecute() { execute(); }

    private:
	ImageModel *m_model;
	ImagePoint m_oldPoint;
	ImagePoint m_newPoint;
    };

    /**
     * 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("Image");
        case 3: return tr("Label");
        default: return tr("Unknown");
        }
    }

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

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

        switch (column) {
        case 2: return i->image;
        case 3: return i->label;
        default: return QVariant();
        }
    }

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

        if (role != Qt::EditRole) return 0;
        PointListIterator 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.image = value.toString(); 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 > 2) return SortAlphabetical;
        return SortNumeric;
    }
};


#endif