view data/model/TabularModel.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 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 sv_frame_t getFrameForRow(int row) const = 0;
    virtual int getRowForFrame(sv_frame_t 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