presentationwidget.cpp.svn-base

okular

        m_pagesEdit->setValidator( validator );
        m_topBar->addWidget( m_pagesEdit );
        connect( m_pagesEdit, SIGNAL( returnPressed() ), this, SLOT( slotPageChanged() ) );
        m_topBar->addAction( KIcon("1rightarrow"), i18n("Next Page"), this, SLOT( slotNextPage() ) );
        QWidget *spacer = new QWidget(m_topBar);
        spacer->setSizePolicy( QSizePolicy::Expanding, QSizePolicy::MinimumExpanding );
        m_topBar->addWidget( spacer );
        m_topBar->addAction( KIcon("exit"), i18n("Exit Presentation Mode"), this, SLOT( close() ) );
        m_topBar->setGeometry( 0, 0, m_width, 32 + 10 );
        m_topBar->hide();
        // change topbar background color
        QPalette p = m_topBar->palette();
        p.setColor( QPalette::Active, QPalette::Button, Qt::gray );
        p.setColor( QPalette::Active, QPalette::Background, Qt::darkGray );
        m_topBar->setPalette( p );

        // register this observer in document. events will come immediately
        m_document->addObserver( this );

        // show summary if requested
        if ( KpdfSettings::slidesShowSummary() )
            generatePage();
    }

    // check painting rect consistancy
    QRect r = pe->rect().intersect( geometry() );
    if ( r.isNull() || m_lastRenderedPixmap.isNull() )
        return;

    // blit the pixmap to the screen
    QVector<QRect> allRects = pe->region().rects();
    uint numRects = allRects.count();
    QPainter painter( this );
    for ( uint i = 0; i < numRects; i++ )
    {
        const QRect & r = allRects[i];
        if ( !r.isValid() )
            continue;
#ifdef ENABLE_PROGRESS_OVERLAY
        if ( KpdfSettings::slidesShowProgress() && r.intersects( m_overlayGeometry ) )
        {
            // backbuffer the overlay operation
            QPixmap backPixmap( r.size() );
            QPainter pixPainter( &backPixmap );

            // first draw the background on the backbuffer
            pixPainter.drawPixmap( QPoint(0,0), m_lastRenderedPixmap, r );

            // then blend the overlay (a piece of) over the background
            QRect ovr = m_overlayGeometry.intersect( r );
            pixPainter.drawPixmap( ovr.left() - r.left(), ovr.top() - r.top(),
                m_lastRenderedOverlay, ovr.left() - m_overlayGeometry.left(),
                ovr.top() - m_overlayGeometry.top(), ovr.width(), ovr.height() );

            // finally blit the pixmap to the screen
            pixPainter.end();
            painter.drawPixmap( r.topLeft(), backPixmap, backPixmap.rect() );
        } else
#endif
        // copy the rendered pixmap to the screen
        painter.drawPixmap( r.topLeft(), m_lastRenderedPixmap, r );
    }
    painter.end();
}
// </widget events>


const KPDFLink * PresentationWidget::getLink( int x, int y, QRect * geometry ) const
{
    // no links on invalid pages
    if ( geometry && !geometry->isNull() )
        geometry->setRect( 0, 0, 0, 0 );
    if ( m_frameIndex < 0 || m_frameIndex >= (int)m_frames.size() )
        return 0;

    // get frame, page and geometry
    const PresentationFrame * frame = m_frames[ m_frameIndex ];
    const KPDFPage * page = frame->page;
    const QRect & frameGeometry = frame->geometry;

    // compute normalized x and y
    double nx = (double)(x - frameGeometry.left()) / (double)frameGeometry.width();
    double ny = (double)(y - frameGeometry.top()) / (double)frameGeometry.height();

    // no links outside the pages
    if ( nx < 0 || nx > 1 || ny < 0 || ny > 1 )
        return 0;

    // check if 1) there is an object and 2) it's a link
    const ObjectRect * object = page->getObjectRect( ObjectRect::Link, nx, ny );
    if ( !object )
        return 0;

    // compute link geometry if destination rect present
    if ( geometry )
    {
        *geometry = object->boundingRect( frameGeometry.width(), frameGeometry.height() );
        geometry->translate( frameGeometry.left(), frameGeometry.top() );
    }

    // return the link pointer
    return (KPDFLink *)object->pointer();
}

void PresentationWidget::testCursorOnLink( int x, int y )
{
    const KPDFLink * link = getLink( x, y, 0 );

    // only react on changes (in/out from a link)
    if ( (link && !m_handCursor) || (!link && m_handCursor) )
    {
        // change cursor shape
        m_handCursor = link != 0;
        setCursor( m_handCursor ? KCursor::handCursor() : KCursor::arrowCursor() );
    }
}

void PresentationWidget::overlayClick( const QPoint & position )
{
    // clicking the progress indicator
    int xPos = position.x() - m_overlayGeometry.x() - m_overlayGeometry.width() / 2,
        yPos = m_overlayGeometry.height() / 2 - position.y();
    if ( !xPos && !yPos )
        return;

    // compute angle relative to indicator (note coord transformation)
    float angle = 0.5 + 0.5 * atan2( -xPos, -yPos ) / M_PI;
    int pageIndex = (int)( angle * ( m_frames.count() - 1 ) + 0.5 );

    // go to selected page
    changePage( pageIndex );
}

void PresentationWidget::changePage( int newPage )
{
    if ( m_frameIndex == newPage )
        return;

    // check if pixmap exists or else request it
    m_frameIndex = newPage;
    PresentationFrame * frame = m_frames[ m_frameIndex ];
    int pixW = frame->geometry.width();
    int pixH = frame->geometry.height();
    int rot = frame->page->orientation();

    bool signalsBlocked = m_pagesEdit->signalsBlocked();
    m_pagesEdit->blockSignals( true );
    m_pagesEdit->setText( QString::number( m_frameIndex + 1 ) );
    m_pagesEdit->blockSignals( signalsBlocked );

    // if pixmap not inside the KPDFPage we request it and wait for
    // notifyPixmapChanged call or else we can proceed to pixmap generation
    if ( !frame->page->hasPixmap( PRESENTATION_ID, pixW, pixH ) )
    {
        // operation will take long: set busy cursor
        QApplication::setOverrideCursor( KCursor::workingCursor() );
        // request the pixmap
        QLinkedList< PixmapRequest * > request;
        request.push_back( new PixmapRequest( PRESENTATION_ID, m_frameIndex, pixW, pixH, rot, PRESENTATION_PRIO ) );
        m_document->requestPixmaps( request );
        // restore cursor
        QApplication::restoreOverrideCursor();
    }
    else
    {
        // make the background pixmap
        generatePage();
    }
}

void PresentationWidget::generatePage()
{
    if ( m_lastRenderedPixmap.isNull() )
        m_lastRenderedPixmap = QPixmap( m_width, m_height );

    // opens the painter over the pixmap
    QPainter pixmapPainter;
    pixmapPainter.begin( &m_lastRenderedPixmap );
    // generate welcome page
    if ( m_frameIndex == -1 )
        generateIntroPage( pixmapPainter );
    // generate a normal pixmap with extended margin filling
    if ( m_frameIndex >= 0 && m_frameIndex < (int)m_document->pages() )
        generateContentsPage( m_frameIndex, pixmapPainter );
    pixmapPainter.end();

    // generate the top-right corner overlay
#ifdef ENABLE_PROGRESS_OVERLAY
    if ( KpdfSettings::slidesShowProgress() && m_frameIndex != -1 )
        generateOverlay();
#endif

    // start transition on pages that have one
    const KPDFPageTransition * transition = m_frameIndex != -1 ?
        m_frames[ m_frameIndex ]->page->getTransition() : 0;
    if ( transition )
        initTransition( transition );
    else {
        KPDFPageTransition trans = defaultTransition();
        initTransition( &trans );
    }

    // update cursor + tooltip
    if ( KpdfSettings::slidesCursor() != KpdfSettings::EnumSlidesCursor::Hidden )
    {
        QPoint p = mapFromGlobal( QCursor::pos() );
        testCursorOnLink( p.x(), p.y() );
    }
}

void PresentationWidget::generateIntroPage( QPainter & p )
{
    // use a vertical gray gradient background
    int blend1 = m_height / 10,
        blend2 = 9 * m_height / 10;
    int baseTint = QColor(Qt::gray).red();
    for ( int i = 0; i < m_height; i++ )
    {
        int k = baseTint;
        if ( i < blend1 )
            k -= (int)( baseTint * (i-blend1)*(i-blend1) / (float)(blend1 * blend1) );
        if ( i > blend2 )
            k += (int)( (255-baseTint) * (i-blend2)*(i-blend2) / (float)(blend1 * blend1) );
        p.fillRect( 0, i, m_width, 1, QColor( k, k, k ) );
    }

    // draw okular logo in the four corners
    QPixmap logo = DesktopIcon( "okular", 64 );
    if ( !logo.isNull() )
    {
        p.drawPixmap( 5, 5, logo );
        p.drawPixmap( m_width - 5 - logo.width(), 5, logo );
        p.drawPixmap( m_width - 5 - logo.width(), m_height - 5 - logo.height(), logo );
        p.drawPixmap( 5, m_height - 5 - logo.height(), logo );
    }

    // draw metadata text (the last line is 'click to begin')
    int strNum = m_metaStrings.count(),
        strHeight = m_height / ( strNum + 4 ),
        fontHeight = 2 * strHeight / 3;
    QFont font( p.font() );
    font.setPixelSize( fontHeight );
    QFontMetrics metrics( font );
    for ( int i = 0; i < strNum; i++ )
    {
        // set a font to fit text width
        float wScale = (float)metrics.boundingRect( m_metaStrings[i] ).width() / (float)m_width;
        QFont f( font );
        if ( wScale > 1.0 )
            f.setPixelSize( (int)( (float)fontHeight / (float)wScale ) );
        p.setFont( f );

        // text shadow
        p.setPen( Qt::darkGray );
        p.drawText( 2, m_height / 4 + strHeight * i + 2, m_width, strHeight,
                    Qt::AlignHCenter | Qt::AlignVCenter, m_metaStrings[i] );
        // text body
        p.setPen( 128 + (127 * i) / strNum );
        p.drawText( 0, m_height / 4 + strHeight * i, m_width, strHeight,
                    Qt::AlignHCenter | Qt::AlignVCenter, m_metaStrings[i] );
    }
}

void PresentationWidget::generateContentsPage( int pageNum, QPainter & p )
{
    PresentationFrame * frame = m_frames[ pageNum ];

    // translate painter and contents rect
    QRect geom( frame->geometry );
    p.translate( geom.left(), geom.top() );
    geom.translate( -geom.left(), -geom.top() );

    // draw the page using the shared PagePainter class
    int flags = PagePainter::Accessibility;
    PagePainter::paintPageOnPainter( &p, frame->page, PRESENTATION_ID, flags,
                                     geom.width(), geom.height(), geom );

    // restore painter
    p.translate( -frame->geometry.left(), -frame->geometry.top() );

    // fill unpainted areas with background color
    QRegion unpainted( QRect( 0, 0, m_width, m_height ) );
    QVector<QRect> rects = unpainted.subtract( frame->geometry ).rects();
    for ( int i = 0; i < rects.count(); i++ )
    {
        const QRect & r = rects[i];
        p.fillRect( r, KpdfSettings::slidesBackgroundColor() );
    }
}

// from Arthur - Qt4 - (is defined elsewhere as 'qt_div_255' to not break final compilation)
inline int qt_div255(int x) { return (x + (x>>8) + 0x80) >> 8; }
void PresentationWidget::generateOverlay()
{
#ifdef ENABLE_PROGRESS_OVERLAY
    // calculate overlay geometry and resize pixmap if needed
    int side = m_width / 16;
    m_overlayGeometry.setRect( m_width - side - 4, 4, side, side );

    // note: to get a sort of antialiasing, we render the pixmap double sized
    // and the resulting image is smoothly scaled down. So here we open a
    // painter on the double sized pixmap.
    side *= 2;
    QPixmap doublePixmap( side, side );
    doublePixmap.fill( Qt::black );
    QPainter pixmapPainter( &doublePixmap );

    // draw PIE SLICES in blue levels (the levels will then be the alpha component)
    int pages = m_document->pages();
    if ( pages > 28 )
    {   // draw continuous slices
        int degrees = (int)( 360 * (float)(m_frameIndex + 1) / (float)pages );
        pixmapPainter.setPen( 0x05 );
        pixmapPainter.setBrush( QColor( 0x40 ) );
        pixmapPainter.drawPie( 2, 2, side - 4, side - 4, 90*16, (360-degrees)*16 );
        pixmapPainter.setPen( 0x40 );
        pixmapPainter.setBrush( QColor( 0xF0 ) );
        pixmapPainter.drawPie( 2, 2, side - 4, side - 4, 90*16, -degrees*16 );
    }
    else
    {   // draw discrete slices
        float oldCoord = -90;
        for ( int i = 0; i < pages; i++ )
        {
            float newCoord = -90 + 360 * (float)(i + 1) / (float)pages;
            pixmapPainter.setPen( i <= m_frameIndex ? 0x40 : 0x05 );
            pixmapPainter.setBrush( QColor( i <= m_frameIndex ? 0xF0 : 0x40 ) );
            pixmapPainter.drawPie( 2, 2, side - 4, side - 4,
                                   (int)( -16*(oldCoord + 1) ), (int)( -16*(newCoord - (oldCoord + 2)) ) );
            oldCoord = newCoord;
        }
    }
    int circleOut = side / 4;
    pixmapPainter.setPen( Qt::black );
    pixmapPainter.setBrush( Qt::black );
    pixmapPainter.drawEllipse( circleOut, circleOut, side - 2*circleOut, side - 2*circleOut );

    // draw TEXT using maximum opacity
    QFont f( pixmapPainter.font() );
    f.setPixelSize( side / 4 );