view base/Selection.h @ 492:23945cdd7161

* Update RDF query stuff again so as to set up a temporary datastore
  each time we want to query over an rdf file, instead of using rasqal
  against the file.  Seems the only way to avoid threading and storage
  management issues when trying to load from a single-source file and
  perform queries against our main datastore at the same time.  Maybe.

/* -*- 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 _SELECTION_H_
#define _SELECTION_H_

#include <cstddef>
#include <set>

#include "XmlExportable.h"

class Selection
{
public:
    Selection();
    Selection(size_t startFrame, size_t endFrame);
    Selection(const Selection &);
    Selection &operator=(const Selection &);
    virtual ~Selection();

    bool isEmpty() const;
    size_t getStartFrame() const;
    size_t getEndFrame() const;
    bool contains(size_t frame) const;

    bool operator<(const Selection &) const;
    bool operator==(const Selection &) const;
    
protected:
    size_t m_startFrame;
    size_t m_endFrame;
};

class MultiSelection : public XmlExportable
{
public:
    MultiSelection();
    virtual ~MultiSelection();

    typedef std::set<Selection> SelectionList;

    const SelectionList &getSelections() const;
    void setSelection(const Selection &selection);
    void addSelection(const Selection &selection);
    void removeSelection(const Selection &selection);
    void clearSelections();

    void getExtents(size_t &startFrame, size_t &endFrame) const;

    /**
     * Return the selection that contains a given frame.
     * If defaultToFollowing is true, and if the frame is not in a
     * selected area, return the next selection after the given frame.
     * Return the empty selection if no appropriate selection is found.
     */
    Selection getContainingSelection(size_t frame, bool defaultToFollowing) const;

    virtual void toXml(QTextStream &stream, QString indent = "",
                       QString extraAttributes = "") const;

protected:
    SelectionList m_selections;
};
    

#endif