trackeditor.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 "TrackEditor.h"
#include <qlayout.h>
#include <kapplication.h>

#include <klocale.h>
#include <kconfig.h>
#include <kstddirs.h>
#include "misc/Debug.h"
#include "document/ConfigGroups.h"
#include "gui/application/RosegardenDCOP.h"
#include "gui/seqmanager/SequenceManager.h"
#include "gui/rulers/StandardRuler.h"
#include "base/Composition.h"
#include "base/MidiProgram.h"
#include "base/RealTime.h"
#include "base/RulerScale.h"
#include "base/Segment.h"
#include "base/Selection.h"
#include "commands/segment/AddTracksCommand.h"
#include "commands/segment/DeleteTracksCommand.h"
#include "commands/segment/SegmentEraseCommand.h"
#include "commands/segment/SegmentInsertCommand.h"
#include "commands/segment/SegmentRepeatToCopyCommand.h"
#include "segmentcanvas/CompositionModel.h"
#include "segmentcanvas/CompositionModelImpl.h"
#include "segmentcanvas/CompositionView.h"
#include "document/MultiViewCommandHistory.h"
#include "document/RosegardenGUIDoc.h"
#include "gui/application/RosegardenGUIApp.h"
#include "gui/rulers/ChordNameRuler.h"
#include "gui/rulers/TempoRuler.h"
#include "gui/rulers/LoopRuler.h"
#include "gui/widgets/ProgressDialog.h"
#include "gui/widgets/QDeferScrollView.h"
#include "sound/AudioFile.h"
#include "TrackButtons.h"
#include "TrackEditorIface.h"
#include <dcopobject.h>
#include <kcommand.h>
#include <kglobal.h>
#include <kmessagebox.h>
#include <qapplication.h>
#include <qcursor.h>
#include <qfont.h>
#include <qpixmap.h>
#include <qpoint.h>
#include <qscrollview.h>
#include <qstring.h>
#include <qstringlist.h>
#include <qstrlist.h>
#include <qwidget.h>
#include <qvalidator.h>
#include <qdragobject.h>
#include <qtextstream.h>


namespace Rosegarden
{

TrackEditor::TrackEditor(RosegardenGUIDoc* doc,
                         QWidget* rosegardenguiview,
                         RulerScale *rulerScale,
                         bool showTrackLabels,
                         double initialUnitsPerPixel,
                         QWidget* parent, const char* name,
                         WFlags) :
        DCOPObject("TrackEditorIface"),
        QWidget(parent, name),
        m_doc(doc),
        m_rulerScale(rulerScale),
        m_topStandardRuler(0),
        m_bottomStandardRuler(0),
        m_trackButtons(0),
        m_segmentCanvas(0),
        m_trackButtonScroll(0),
        m_showTrackLabels(showTrackLabels),
        m_canvasWidth(0),
        m_compositionRefreshStatusId(doc->getComposition().getNewRefreshStatusId()),
        m_playTracking(true),
        m_initialUnitsPerPixel(initialUnitsPerPixel)
{
    // accept dnd
    setAcceptDrops(true);

    init(rosegardenguiview);
    slotReadjustCanvasSize();
}

TrackEditor::~TrackEditor()
{
    delete m_chordNameRuler;
    delete m_compositionModel;
}

void
TrackEditor::init(QWidget* rosegardenguiview)
{
    QGridLayout *grid = new QGridLayout(this, 4, 2);

    int trackLabelWidth = 230;
    int barButtonsHeight = 25;

    m_chordNameRuler = new ChordNameRuler(m_rulerScale,
                                          m_doc,
                                          0.0,
                                          20,
                                          this);
    grid->addWidget(m_chordNameRuler, 0, 1);

    m_tempoRuler = new TempoRuler(m_rulerScale,
                                  m_doc,
                                  RosegardenGUIApp::self(),
                                  0.0,
                                  24,
                                  true,
                                  this);

    grid->addWidget(m_tempoRuler, 1, 1);

    m_tempoRuler->connectSignals();

    //
    // Top Bar Buttons
    //
    m_topStandardRuler = new StandardRuler(m_doc,
                                     m_rulerScale,
                                     0,
                                     barButtonsHeight,
                                     false,
                                     this, "topbarbuttons");
    m_topStandardRuler->connectRulerToDocPointer(m_doc);

    grid->addWidget(m_topStandardRuler, 2, 1);

    //
    // Segment Canvas
    //
    m_compositionModel = new CompositionModelImpl(m_doc->getComposition(),
                         m_doc->getStudio(),
                         m_rulerScale, getTrackCellHeight());

    connect(rosegardenguiview, SIGNAL(instrumentParametersChanged(InstrumentId)),
            m_compositionModel, SLOT(slotInstrumentParametersChanged(InstrumentId)));
    connect(rosegardenguiview->parent(), SIGNAL(instrumentParametersChanged(InstrumentId)),
            m_compositionModel, SLOT(slotInstrumentParametersChanged(InstrumentId)));

    m_segmentCanvas = new CompositionView(m_doc, m_compositionModel, this);

    kapp->config()->setGroup(GeneralOptionsConfigGroup);
    if (kapp->config()->readBoolEntry("backgroundtextures", true)) {
        QPixmap background;
        QString pixmapDir = KGlobal::dirs()->findResource("appdata", "pixmaps/");
        if (background.load(QString("%1/misc/bg-segmentcanvas.xpm").
                            arg(pixmapDir))) {
            m_segmentCanvas->setBackgroundPixmap(background);
            m_segmentCanvas->viewport()->setBackgroundPixmap(background);
        }
    }

    //
    // Bottom Bar Buttons
    //
    m_bottomStandardRuler = new StandardRuler(m_doc,
                                        m_rulerScale,
                                        0,
                                        barButtonsHeight,
                                        true,
                                        m_segmentCanvas, "bottombarbuttons");
    m_bottomStandardRuler->connectRulerToDocPointer(m_doc);

    m_segmentCanvas->setBottomFixedWidget(m_bottomStandardRuler);

    grid->addWidget(m_segmentCanvas, 3, 1);

    grid->setColStretch(1, 10); // to make sure the seg canvas doesn't leave a "blank" grey space when
    // loading a file which has a low zoom factor

    // Track Buttons
    //
    // (must be put in a QScrollView)
    //
    m_trackButtonScroll = new QDeferScrollView(this);
    grid->addWidget(m_trackButtonScroll, 3, 0);

    int canvasHeight = getTrackCellHeight() *
                       std::max(40u, m_doc->getComposition().getNbTracks());

    m_trackButtons = new TrackButtons(m_doc,
                                      getTrackCellHeight(),
                                      trackLabelWidth,
                                      m_showTrackLabels,
                                      canvasHeight,
                                      m_trackButtonScroll->viewport());
    m_trackButtonScroll->addChild(m_trackButtons);
    m_trackButtonScroll->setHScrollBarMode(QScrollView::AlwaysOff);
    m_trackButtonScroll->setVScrollBarMode(QScrollView::AlwaysOff);
    m_trackButtonScroll->setResizePolicy(QScrollView::AutoOneFit);
    m_trackButtonScroll->setBottomMargin(m_bottomStandardRuler->height() +
                                         m_segmentCanvas->horizontalScrollBar()->height());

    connect(m_trackButtons, SIGNAL(widthChanged()),
            this, SLOT(slotTrackButtonsWidthChanged()));

    connect(m_trackButtons, SIGNAL(trackSelected(int)),
            rosegardenguiview, SLOT(slotSelectTrackSegments(int)));

    connect(m_trackButtons, SIGNAL(instrumentSelected(int)),
            rosegardenguiview, SLOT(slotUpdateInstrumentParameterBox(int)));

    connect(this, SIGNAL(stateChange(QString, bool)),
            rosegardenguiview, SIGNAL(stateChange(QString, bool)));

    connect(m_trackButtons, SIGNAL(modified()),
            m_doc, SLOT(slotDocumentModified()));

    connect(m_trackButtons, SIGNAL(muteButton(TrackId, bool)),
            rosegardenguiview, SLOT(slotSetMuteButton(TrackId, bool)));

    // connect loop rulers' follow-scroll signals
    connect(m_topStandardRuler->getLoopRuler(), SIGNAL(startMouseMove(int)),
            m_segmentCanvas, SLOT(startAutoScroll(int)));
    connect(m_topStandardRuler->getLoopRuler(), SIGNAL(stopMouseMove()),
            m_segmentCanvas, SLOT(stopAutoScroll()));
    connect(m_bottomStandardRuler->getLoopRuler(), SIGNAL(startMouseMove(int)),
            m_segmentCanvas, SLOT(startAutoScroll(int)));
    connect(m_bottomStandardRuler->getLoopRuler(), SIGNAL(stopMouseMove()),
            m_segmentCanvas, SLOT(stopAutoScroll()));

    connect(m_segmentCanvas, SIGNAL(contentsMoving(int, int)),
            this, SLOT(slotCanvasScrolled(int, int)));

    // Synchronize bar buttons' scrollview with segment canvas' scrollbar
    //
    connect(m_segmentCanvas->verticalScrollBar(), SIGNAL(valueChanged(int)),
            this, SLOT(slotVerticalScrollTrackButtons(int)));

    connect(m_segmentCanvas->verticalScrollBar(), SIGNAL(sliderMoved(int)),
            this, SLOT(slotVerticalScrollTrackButtons(int)));

    // scrolling with mouse wheel
    connect(m_trackButtonScroll, SIGNAL(gotWheelEvent(QWheelEvent*)),
            m_segmentCanvas, SLOT(slotExternalWheelEvent(QWheelEvent*)));

    // Connect horizontal scrollbar
    //
    connect(m_segmentCanvas->horizontalScrollBar(), SIGNAL(valueChanged(int)),
            m_topStandardRuler, SLOT(slotScrollHoriz(int)));
    connect(m_segmentCanvas->horizontalScrollBar(), SIGNAL(sliderMoved(int)),
            m_topStandardRuler, SLOT(slotScrollHoriz(int)));

    connect(m_segmentCanvas->horizontalScrollBar(), SIGNAL(valueChanged(int)),
            m_bottomStandardRuler, SLOT(slotScrollHoriz(int)));
    connect(m_segmentCanvas->horizontalScrollBar(), SIGNAL(sliderMoved(int)),
            m_bottomStandardRuler, SLOT(slotScrollHoriz(int)));

    connect(m_segmentCanvas->horizontalScrollBar(), SIGNAL(valueChanged(int)),
            m_tempoRuler, SLOT(slotScrollHoriz(int)));
    connect(m_segmentCanvas->horizontalScrollBar(), SIGNAL(sliderMoved(int)),
            m_tempoRuler, SLOT(slotScrollHoriz(int)));

    connect(m_segmentCanvas->horizontalScrollBar(), SIGNAL(valueChanged(int)),
            m_chordNameRuler, SLOT(slotScrollHoriz(int)));
    connect(m_segmentCanvas->horizontalScrollBar(), SIGNAL(sliderMoved(int)),
            m_chordNameRuler, SLOT(slotScrollHoriz(int)));

    connect(this, SIGNAL(needUpdate()), m_segmentCanvas, SLOT(slotUpdateSegmentsDrawBuffer()));

    connect(m_segmentCanvas->getModel(),
            SIGNAL(selectedSegments(const SegmentSelection &)),
            rosegardenguiview,
            SLOT(slotSelectedSegments(const SegmentSelection &)));

    connect(m_segmentCanvas, SIGNAL(zoomIn()),
            RosegardenGUIApp::self(), SLOT(slotZoomIn()));
    connect(m_segmentCanvas, SIGNAL(zoomOut()),
            RosegardenGUIApp::self(), SLOT(slotZoomOut()));

    connect(getCommandHistory(), SIGNAL(commandExecuted()),
            this, SLOT(update()));

    connect(m_doc, SIGNAL(pointerPositionChanged(timeT)),
            this, SLOT(slotSetPointerPosition(timeT)));

    //
    // pointer and loop drag signals from top and bottom bar buttons (loop rulers actually)
    //
    connect(m_topStandardRuler, SIGNAL(dragPointerToPosition(timeT)),
            this, SLOT(slotPointerDraggedToPosition(timeT)));
    connect(m_bottomStandardRuler, SIGNAL(dragPointerToPosition(timeT)),
            this, SLOT(slotPointerDraggedToPosition(timeT)));

    connect(m_topStandardRuler, SIGNAL(dragLoopToPosition(timeT)),
            this, SLOT(slotLoopDraggedToPosition(timeT)));
    connect(m_bottomStandardRuler, SIGNAL(dragLoopToPosition(timeT)),
            this, SLOT(slotLoopDraggedToPosition(timeT)));

    connect(m_doc, SIGNAL(loopChanged(timeT,
                                      timeT)),
            this, SLOT(slotSetLoop(timeT, timeT)));
}

void TrackEditor::slotReadjustCanvasSize()
{
    m_segmentCanvas->slotUpdateSize();
}

void TrackEditor::slotTrackButtonsWidthChanged()
{
    // We need to make sure the trackButtons geometry is fully updated
    //
    ProgressDialog::processEvents();

    m_trackButtonScroll->setMinimumWidth(m_trackButtons->width());
    m_doc->slotDocumentModified();
}

int TrackEditor::getTrackCellHeight() const
{
    int size;
    static QFont defaultFont;

    // do some scrabbling around for a reasonable size
    //
    size = defaultFont.pixelSize();

    if (size < 8) {
        if (QApplication::font(this).pixelSize() < 8)
            size = 12;
        else
            size = QApplication::font(this).pixelSize();
    }

    return size + 12;
}

bool TrackEditor::isCompositionModified()
{
    return m_doc->getComposition().getRefreshStatus
           (m_compositionRefreshStatusId).needsRefresh();
}

void TrackEditor::setCompositionModified(bool c)
{
    m_doc->getComposition().getRefreshStatus
    (m_compositionRefreshStatusId).setNeedsRefresh(c);
}

void TrackEditor::updateRulers()
{
    if (getTempoRuler() != 0)
        getTempoRuler()->update();

    if (getChordNameRuler() != 0)
        getChordNameRuler()->update();

    getTopStandardRuler()->update();
    getBottomStandardRuler()->update();
}

void TrackEditor::paintEvent(QPaintEvent* e)
{
    if (isCompositionModified()) {

        RG_DEBUG << "TrackEditor::paintEvent: composition is modified, update everything\n";

        slotReadjustCanvasSize();
        m_trackButtons->slotUpdateTracks();
        m_segmentCanvas->clearSegmentRectsCache(true);
        m_segmentCanvas->updateContents();

        Composition &composition = m_doc->getComposition();

        if (composition.getNbSegments() == 0) {
            emit stateChange("have_segments", false); // no segments : reverse state
            emit stateChange("have_selection", false); // no segments : reverse state
        } else {
            emit stateChange("have_segments", true);
            if (m_segmentCanvas->haveSelection())
                emit stateChange("have_selection", true);
            else
                emit stateChange("have_selection", false); // no selection : reverse state
        }

        setCompositionModified(false);
    }

    QWidget::paintEvent(e);
}

void TrackEditor::slotAddTracks(unsigned int nbNewTracks,