playlistitem.cpp

来自「Amarok是一款在LINUX或其他类UNIX操作系统中运行的音频播放器软件。 」· C++ 代码 · 共 1,153 行 · 第 1/3 页

    static const QPixmap pixstop   = Amarok::getPNG(  "currenttrack_stop_small"  ),
                         pixrepeat = Amarok::getPNG( "currenttrack_repeat_small" );

    //figure out if we are in the actual physical first column
    if( column == listView()->m_firstColumn && num )
    {
        //margin, height
        const uint m = 2, h = height() - m;

        const QString str = QString::number( queue );

        const uint qw = painter->fontMetrics().width( str ), sw = pixstop.width(),  rw = pixrepeat.width(),
                   qh = painter->fontMetrics().height(),     sh = pixstop.height(), rh = pixrepeat.height();

        //maxwidth
        const uint mw = kMax( qw, kMax( rw, sw ) );

        //width of first & second column of pixmaps
        const uint w1 = ( num == 3 ) ? kMax( qw, rw )
                      : ( num == 2 && isCurrent ) ? kMax( repeat ? rw : 0, kMax( stop ? sw : 0, queue ? qw : 0 ) )
                      : ( num == 2 ) ? qw
                      : queue ? qw : repeat ? rw : stop ? sw : 0,
                   w2 = ( num == 3 ) ? sw
                      : ( num == 2 && !isCurrent ) ? sw
                      : 0; //phew

        //ellipse width, total width
        const uint ew = 16, tw = w1 + w2 + m * ( w2 ? 2 : 1 );
        p.setBrush( cg.highlight() );
        p.setPen( cg.highlight().dark() ); //TODO blend with background color
        p.drawEllipse( width - tw - ew/2, m / 2, ew, h );
        p.drawRect( width - tw, m / 2, tw, h );
        p.setPen( cg.highlight() );
        p.drawLine( width - tw, m/2 + 1, width - tw, h - m/2 );

        int x = width - m - mw, y = height() / 2, tmp = 0;
        const bool multi = ( isCurrent && num >= 2 );
        if( queue )
        {
            //draw the shadowed inner text
            //NOTE we can't set an arbituary font size or family, these settings are already optional
            //and user defaults should also take presidence if no playlist font has been selected
            //const QFont smallFont( "Arial", (playNext > 9) ? 9 : 12 );
            //p->setFont( smallFont );
            //TODO the shadow is hard to do well when using a dark font color
            //TODO it also looks cluttered for small font sizes
            //p->setPen( cg.highlightedText().dark() );
            //p->drawText( width - w + 2, 3, w, h-1, Qt::AlignCenter, str );

            if( !multi )
                tmp = -(qh / 2);
            y += tmp;
            p.setPen( cg.highlightedText() );
            p.drawText( x, y, -x + width, multi ? h/2 : qh, Qt::AlignCenter, str );
            y -= tmp;
            if( isCurrent )
                y -= height() / 2;
            else
                x -= m + w2;
        }
        if( repeat )
        {
            if( multi )
                tmp = (h/2 - rh)/2 + ( num == 2 && stop ? 0 : 1 );
            else
                tmp = -(rh / 2);
            y += tmp;
            p.drawPixmap( x, y, pixrepeat );
            y -= tmp;
            if( num == 3 )
            {
                x -= m + w2 + 2;
                y = height() / 2;
            }
            else
                y -= height() / 2;
        }
        if( stop )
        {
            if( multi && num != 3 )
                tmp = m + (h/2 - sh)/2;
            else
                tmp = -(sh / 2);
            y += tmp;
            p.drawPixmap( x, y, pixstop );
            y -= tmp;
        }
    }

    if( this != listView()->currentTrack() && !isSelected() )
    {
        p.setPen( QPen( cg.mid(), 0, Qt::SolidLine ) );
        p.drawLine( width - 1, 0, width - 1, height() - 1 );
    }

    p.end();
    painter->drawPixmap( 0, 0, buf );
}

void PlaylistItem::drawRating( QPainter *p )
{
    int gray = 0;
    if( this == listView()->m_hoveredRating || ( isSelected() && listView()->m_selCount > 1 &&
        listView()->m_hoveredRating && listView()->m_hoveredRating->isSelected() ) )
    {
        const int pos = listView()->viewportToContents( listView()->viewport()->mapFromGlobal( QCursor::pos() ) ).x();
        gray = ratingAtPoint( pos );
    }

    drawRating( p, ( rating() + 1 ) / 2, gray / 2, rating() % 2 );
}

void PlaylistItem::drawRating( QPainter *p, int stars, int greystars, bool half )
{
    int i = 1, x = 1;
    const int y = height() / 2 - StarManager::instance()->getGreyStar()->height() / 2;
    if( half )
        i++;
    //We use multiple pre-colored stars instead of coloring here to keep things speedy
    for(; i <= stars; ++i )
    {
        bitBlt( p->device(), x, y, StarManager::instance()->getStar( stars ) );
        x += StarManager::instance()->getGreyStar()->width() + listView()->itemMargin();
    }
    if( half )
    {
        bitBlt( p->device(), x, y, StarManager::instance()->getHalfStar( stars ) );
        x += StarManager::instance()->getGreyStar()->width() + listView()->itemMargin();
    }
    for(; i <= greystars; ++i )
    {
        bitBlt( p->device(), x, y, StarManager::instance()->getGreyStar() );
        x += StarManager::instance()->getGreyStar()->width() + listView()->itemMargin();
    }
}

#define MOODBAR_SPACING 2  // The distance from the moodbar pixmap to each side

void PlaylistItem::drawMood( QPainter *p, int width, int height )
{
    // In theory, if AmarokConfig::showMoodbar() == false, then the
    // moodbar column should be hidden and we shouldn't be here.
    if( !AmarokConfig::showMoodbar() )
      return;

    // Due to the logic of the calling code, this should always return true
    if( moodbar().dataExists() )
      {
        QPixmap mood = moodbar().draw( width - MOODBAR_SPACING*2,
                                       height - MOODBAR_SPACING*2 );
        p->drawPixmap( MOODBAR_SPACING, MOODBAR_SPACING, mood );
      }

    else
      moodbar().load();  // This only has any effect the first time it's run

    // We don't have to listen for the jobEvent() signal since we
    // inherit MetaBundle, and the moodbar lets the MetaBundle know
    // about new data directly via moodbarJobEvent() below.
}

// This is run when a job starts or finishes
void PlaylistItem::moodbarJobEvent( int newState )
{
    (void) newState;  // want to redraw nomatter what the new state is
    if( AmarokConfig::showMoodbar() )
      repaint();
    // Don't automatically resort because it's annoying
}


void PlaylistItem::setup()
{
    KListViewItem::setup();

    // We make the current track item a bit taller than ordinary items
    if( this == listView()->currentTrack() )
        setHeight( int( float( listView()->fontMetrics().height() ) * 1.53 ) );
}


void PlaylistItem::paintFocus( QPainter* p, const QColorGroup& cg, const QRect& r )
{
    if( this != listView()->currentTrack() )
        KListViewItem::paintFocus( p, cg, r );
}

const QString &PlaylistItem::editingText()
{
    static const QString text = i18n( "Writing tag..." );
    return text;
}


/**
 * Changes the transparency (alpha component) of an image.
 * @param image Image to be manipulated. Must be true color (8 bit per channel).
 * @param factor > 1.0 == more transparency, < 1.0 == less transparency.
 */
void PlaylistItem::imageTransparency( QImage& image, float factor ) //static
{
    uint *data = reinterpret_cast<unsigned int *>( image.bits() );
    const int pixels = image.width() * image.height();
    uint table[256];
    register int c;

    // Precalculate lookup table
    for( int i = 0; i < 256; ++i ) {
        c = int( double( i ) * factor );
        if( c > 255 ) c = 255;
        table[i] = c;
    }

    // Process all pixels. Highly optimized.
    for( int i = 0; i < pixels; ++i ) {
        c = data[i]; // Memory access is slow, so do it only once
        data[i] = qRgba( qRed( c ), qGreen( c ), qBlue( c ), table[qAlpha( c )] );
    }
}

AtomicString PlaylistItem::artist_album() const
{
    static const AtomicString various_artist = QString( "Various Artists (INTERNAL) [ASDF!]" );
    if( compilation() == CompilationYes )
        return various_artist;
    else
        return artist();
}

void PlaylistItem::refAlbum()
{
    if( Amarok::entireAlbums() )
    {
        if( listView()->m_albums[artist_album()].find( album() ) == listView()->m_albums[artist_album()].end() )
            listView()->m_albums[artist_album()][album()] = new PlaylistAlbum;
        m_album = listView()->m_albums[artist_album()][album()];
        m_album->refcount++;
    }
}

void PlaylistItem::derefAlbum()
{
    if( Amarok::entireAlbums() && m_album )
    {
        m_album->refcount--;
        if( !m_album->refcount )
        {
            if (!listView()->m_prevAlbums.removeRef( m_album ))
		warning() << "Unable to remove album reference from "
		          << "listView.m_prevAlbums" << endl;
            listView()->m_albums[artist_album()].remove( album() );
            if( listView()->m_albums[artist_album()].isEmpty() )
                listView()->m_albums.remove( artist_album() );
            delete m_album;
        }
    }
}

void PlaylistItem::incrementTotals()
{
    if( Amarok::entireAlbums() && m_album )
    {
        const uint prevCount = m_album->tracks.count();
        // Multiple tracks with same track number are possible; 
        // e.g. with "various_artist" albums or albums with multiple disks.
        // We are trying to keep m_album->tracks sorted first by discNumber() and then by track().
        // It seems that the following assumption is made for the following: 
        // ``Either all the tracks in an album have their track()'s set (to nonzero) or none of them have.''
        if( !track() || !m_album->tracks.count() ||
	    ( m_album->tracks.getLast()->track() &&
	      ( ( m_album->tracks.getLast()->discNumber() < discNumber() ) || 
		( m_album->tracks.getLast()->discNumber() == discNumber() && m_album->tracks.getLast()->track() < track() ) ) ) )
            m_album->tracks.append( this );
        else
            for( int i = 0, n = m_album->tracks.count(); i < n; ++i )
                if(!m_album->tracks.at(i)->track() || m_album->tracks.at(i)->discNumber() > discNumber() ||
		   ( m_album->tracks.at(i)->discNumber() == discNumber() && m_album->tracks.at(i)->track() > track() ) )
                {
                    m_album->tracks.insert( i, this );
                    break;
                }
        const Q_INT64 prevTotal = m_album->total;
        Q_INT64 total = m_album->total * prevCount;
        total += totalIncrementAmount();
        m_album->total = Q_INT64( double( total + 0.5 ) / m_album->tracks.count() );
        if( listView()->m_prevAlbums.findRef( m_album ) == -1 )
            listView()->m_total = listView()->m_total - prevTotal + m_album->total;
    }
    else if( listView()->m_prevTracks.findRef( this ) == -1 )
        listView()->m_total += totalIncrementAmount();
}

void PlaylistItem::decrementTotals()
{
    if( Amarok::entireAlbums() && m_album )
    {
        const Q_INT64 prevTotal = m_album->total;
        Q_INT64 total = m_album->total * m_album->tracks.count();
        if (!m_album->tracks.removeRef( this ))
	    warning() << "Unable to remove myself from m_album" << endl;
        total -= totalIncrementAmount();
        m_album->total = Q_INT64( double( total + 0.5 ) / m_album->tracks.count() );
        if( listView()->m_prevAlbums.findRef( m_album ) == -1 )
            listView()->m_total = listView()->m_total - prevTotal + m_album->total;
    }
    else if( listView()->m_prevTracks.findRef( this ) == -1 )
        listView()->m_total -= totalIncrementAmount();
}

int PlaylistItem::totalIncrementAmount() const
{
    switch( AmarokConfig::favorTracks() )
    {
        case AmarokConfig::EnumFavorTracks::Off: return 0;
        case AmarokConfig::EnumFavorTracks::HigherScores: return score() > 0.f ? static_cast<int>( score() ) : 50;
        case AmarokConfig::EnumFavorTracks::HigherRatings: return rating() ? rating() : 5; // 2.5
        case AmarokConfig::EnumFavorTracks::LessRecentlyPlayed:
        {
            if( lastPlay() )
                return listView()->m_startupTime_t - lastPlay();
            else if( listView()->m_oldestTime_t )
                return ( listView()->m_startupTime_t - listView()->m_oldestTime_t ) * 2;
            else
                return listView()->m_startupTime_t - 1058652000; //july 20, 2003, when Amarok was first released.
        }
        default: return 0;
    }
}

void PlaylistItem::incrementCounts()
{
    listView()->m_totalCount++;
    if( isSelected() )
    {
        listView()->m_selCount++;
    }
    if( isVisible() )
    {
        listView()->m_visCount++;
        incrementTotals();
    }
}

void PlaylistItem::decrementCounts()
{
    listView()->m_totalCount--;
    if( isSelected() )
    {
        listView()->m_selCount--;
    }
    if( isVisible() )
    {
        listView()->m_visCount--;
        decrementTotals();
    }
}

void PlaylistItem::incrementLengths()
{
    listView()->m_totalLength += length();
    if( isSelected() )
    {
        listView()->m_selLength += length();
    }
    if( isVisible() )
    {
        listView()->m_visLength += length();
    }
}

void PlaylistItem::decrementLengths()
{
    listView()->m_totalLength -= length();
    if( isSelected() )
    {
        listView()->m_selLength -= length();
    }
    if( isVisible() )
    {
        listView()->m_visLength -= length();
    }
}