segmenterasecommand.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 "SegmentEraseCommand.h"

#include <klocale.h>
#include "misc/Debug.h"
#include "base/Composition.h"
#include "base/Segment.h"
#include "sound/AudioFile.h"
#include "sound/AudioFileManager.h"


namespace Rosegarden
{

SegmentEraseCommand::SegmentEraseCommand(Segment *segment) :
        KNamedCommand(i18n("Erase Segment")),
        m_composition(segment->getComposition()),
        m_segment(segment),
        m_mgr(0),
        m_audioFileName(""),
        m_detached(false)
{
    // nothing else
}

SegmentEraseCommand::SegmentEraseCommand(Segment *segment,
        AudioFileManager *mgr) :
        KNamedCommand(i18n("Erase Segment")),
        m_composition(segment->getComposition()),
        m_segment(segment),
        m_mgr(mgr),
        m_detached(false)
{
    // If this is an audio segment, we want to make a note of
    // its associated file name in case we need to undo and restore
    // the file.
    if (m_segment->getType() == Segment::Audio) {
        unsigned int id = m_segment->getAudioFileId();
        AudioFile *file = mgr->getAudioFile(id);
        if (file)
            m_audioFileName = file->getFilename();
    }
}

SegmentEraseCommand::~SegmentEraseCommand()
{
    // This is the only place in this command that the Segment can
    // safely be deleted, and then only if it is not in the
    // Composition (i.e. if we executed more recently than we
    // unexecuted).  Can't safely call through the m_segment pointer
    // here; someone else might have got to it first

    if (m_detached) {
        delete m_segment;
    }
}

void
SegmentEraseCommand::execute()
{
    m_composition->detachSegment(m_segment);
    m_detached = true;
}

void
SegmentEraseCommand::unexecute()
{
    m_composition->addSegment(m_segment);
    m_detached = false;

    if (m_segment->getType() == Segment::Audio &&
            m_audioFileName != "" &&
            m_mgr) {
        int id = m_mgr->fileExists(m_audioFileName);

        RG_DEBUG << "SegmentEraseCommand::unexecute: file is " << m_audioFileName << endl;

        if (id == -1)
            id = (int)m_mgr->addFile(m_audioFileName);
        m_segment->setAudioFileId(id);
    }
}

}