view data/model/TabularModel.h @ 489:82ab61fa9223

* Reorganise our sparql queries on the basis that Redland must be
  available, not only optional.  So for anything querying the pool
  of data about plugins, we use a single datastore and model which
  is initialised at the outset by PluginRDFIndexer and then queried
  directly; for anything that "reads from a file" (e.g. loading
  annotations) we query directly using Rasqal, going to the
  datastore when we need additional plugin-related information.

  This may improve performance, but mostly it simplifies the code
  and fixes a serious issue with RDF import in the previous versions
  (namely that multiple sequential RDF imports would end up sharing
  the same RDF data pool!)

/* -*- 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 2008 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 _TABULAR_MODEL_H_
#define _TABULAR_MODEL_H_

#include <QVariant>
#include <QString>

class Command;

/**
 * TabularModel is an abstract base class for models that support
 * direct access to data in a tabular form.  A model that implements
 * TabularModel may be displayed and, perhaps, edited in a data
 * spreadsheet window.
 *
 * This is very like a cut-down QAbstractItemModel.  It assumes a
 * relationship between row number and frame time.
 */

class TabularModel
{
public:
    virtual ~TabularModel() { }

    virtual int getRowCount() const = 0;
    virtual int getColumnCount() const = 0;

    virtual QString getHeading(int column) const = 0;

    enum { SortRole = Qt::UserRole };
    enum SortType { SortNumeric, SortAlphabetical };

    virtual QVariant getData(int row, int column, int role) const = 0;
    virtual bool isColumnTimeValue(int col) const = 0;
    virtual SortType getSortType(int col) const = 0;

    virtual long getFrameForRow(int row) const = 0;
    virtual int getRowForFrame(long frame) const = 0;

    virtual bool isEditable() const { return false; }
    virtual Command *getSetDataCommand(int /* row */, int /* column */, const QVariant &, int /* role */) { return 0; }
    virtual Command *getInsertRowCommand(int /* beforeRow */) { return 0; }
    virtual Command *getRemoveRowCommand(int /* row */) { return 0; }
};

#endif