chord.cpp

LINUX下的混音软件

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */

/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.

    This program is Copyright 2000-2007
        Guillaume Laurent   <[e-mail]>,
        Chris Cannam        <[e-mail]>,
        Richard Bown        <[e-mail]>

    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
    Bown to claim authorship of this work have been asserted.

    Other copyrights also apply to some parts of this work.  Please
    see the AUTHORS file and individual file headers for details.

    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.
*/

#include "Chord.h"
#include "base/Event.h"

#include <qstring.h>

namespace Rosegarden
{

namespace Guitar
{
const std::string Chord::EventType              = "guitarchord";
const short Chord::EventSubOrdering             = -60;
const PropertyName Chord::RootPropertyName      = "root";
const PropertyName Chord::ExtPropertyName       = "ext";
const PropertyName Chord::FingeringPropertyName = "fingering";


Chord::Chord()
    : m_isUserChord(false)
{
}

Chord::Chord(const QString& root, const QString& ext)
    : m_root(root),
      m_ext(ext),
      m_isUserChord(false)
{
    if (m_ext.isEmpty())
        m_ext = QString::null;
}

Chord::Chord(const Event& e)
    : m_isUserChord(false)
{
    std::string f;
    bool ok;

    ok = e.get<String>(RootPropertyName, f);
    if (ok)
        m_root = f;

    ok = e.get<String>(ExtPropertyName, f);
    if (ok) {
        if (f.length() == 0)
            m_ext = QString::null;
        else
            m_ext = f;
    }
    
    ok = e.get<String>(FingeringPropertyName, f);
    if (ok) {
        QString qf(f);
        QString errString;
    
        Fingering fingering = Fingering::parseFingering(qf, errString);    
        setFingering(fingering);
    }
}

Event* Chord::getAsEvent(timeT absoluteTime) const
{
    Event *e = new Event(EventType, absoluteTime, 0, EventSubOrdering);
    e->set<String>(RootPropertyName, m_root);
    e->set<String>(ExtPropertyName, m_ext);
    e->set<String>(FingeringPropertyName, getFingering().toString());
    return e;
}

const QRegExp Chord::ALT_BASS_REGEXP("/[A-G]");

bool operator<(const Chord& a, const Chord& b)
{
    if (a.m_root != b.m_root) {
        return a.m_root < b.m_root;
    } else if (a.m_ext != b.m_ext) {
        if (a.m_ext.isEmpty()) // chords with no ext need to be stored first
            return true;
        if (b.m_ext.isEmpty())
            return false;
        return a.m_ext < b.m_ext;
    } else {
        return a.m_fingering < b.m_fingering;
    }

}

}

}