render_object.cpp

konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版本源码包.

        static_cast<const RenderBox*>(this)->relativePositionOffset(x, y);
    }

    RenderObject* offsetPar = offsetParent();
    for( RenderObject* curr = parent();
         curr && curr != offsetPar;
         curr = curr->parent() )
        x += curr->xPos();

    if ( offsetPar && offsetPar->isBody() && style()->htmlHacks() )
        x += offsetPar->xPos();

    return x;
}

int RenderObject::offsetTop() const
{
    if ( isPositioned() )
        return yPos();

    if ( isBody() && style()->htmlHacks() )
        return 0;

    int y = yPos();
    if (isRelPositioned()) {
        int x = 0;
        static_cast<const RenderBox*>(this)->relativePositionOffset(x, y);
    }
    RenderObject* offsetPar = offsetParent();
    for( RenderObject* curr = parent();
         curr && curr != offsetPar;
         curr = curr->parent() )
        y += curr->yPos();

    if ( offsetPar && offsetPar->isBody() && style()->htmlHacks() )
        y += offsetPar->yPos();

    return y;
}

RenderObject* RenderObject::offsetParent() const
{
    bool skipTables = isPositioned() || isRelPositioned();
    bool strict = !style()->htmlHacks();
    RenderObject* curr = parent();
    while (curr && !curr->isPositioned() && !curr->isRelPositioned() && 
                   !(strict && skipTables ? curr->isRoot() : curr->isBody())) {
        if (!skipTables && (curr->isTableCell() || curr->isTable()))
            break;
        curr = curr->parent();
    }
    return curr;
}

// IE extensions.
// clientWidth and clientHeight represent the interior of an object
short RenderObject::clientWidth() const
{
    return width() - borderLeft() - borderRight() -
        (layer() ? layer()->verticalScrollbarWidth() : 0);
}

int RenderObject::clientHeight() const
{
    return height() - borderTop() - borderBottom() -
      (layer() ? layer()->horizontalScrollbarHeight() : 0);
}

// scrollWidth/scrollHeight is the size including the overflow area
short RenderObject::scrollWidth() const
{
    return (style()->hidesOverflow() && layer()) ? layer()->scrollWidth() : overflowWidth();
}

int RenderObject::scrollHeight() const
{
    return (style()->hidesOverflow() && layer()) ? layer()->scrollHeight() : overflowHeight();
}

bool RenderObject::hasStaticX() const
{
    return (style()->left().isVariable() && style()->right().isVariable()) ||
            style()->left().isStatic() ||
            style()->right().isStatic();
}

bool RenderObject::hasStaticY() const
{
    return (style()->top().isVariable() && style()->bottom().isVariable()) || style()->top().isStatic();
}

void RenderObject::setPixmap(const QPixmap&, const QRect& /*r*/, CachedImage* image)
{
    //repaint bg when it finished loading
    if(image && parent() && style() && style()->backgroundImage() == image
       && image->valid_rect().size() == image->pixmap_size() ) {
        isBody() ? canvas()->repaint() : repaint();
    }
}

void RenderObject::setNeedsLayout(bool b, bool markParents)
{
    bool alreadyNeededLayout = m_needsLayout;
    m_needsLayout = b;
    if (b) {
        if (!alreadyNeededLayout && markParents) {
            dirtyFormattingContext( false );
            markContainingBlocksForLayout();
        }
    }
    else {
        m_posChildNeedsLayout = false;
        m_normalChildNeedsLayout = false;
    }
}

void RenderObject::setChildNeedsLayout(bool b, bool markParents)
{
    bool alreadyNeededLayout = m_normalChildNeedsLayout;
    m_normalChildNeedsLayout = b;
    if (b) {
        if (!alreadyNeededLayout && markParents)
            markContainingBlocksForLayout();
    }
    else {
        m_posChildNeedsLayout = false;
        m_normalChildNeedsLayout = false;
    }
}

void RenderObject::markContainingBlocksForLayout()
{
    RenderObject *o = container();
    RenderObject *last = this;

    while (o) {
        if (!last->isText() && (last->style()->position() == FIXED || last->style()->position() == ABSOLUTE)) {
            if (o->m_posChildNeedsLayout)
                return;
            o->m_posChildNeedsLayout = true;
        }
        else {
            if (o->m_normalChildNeedsLayout)
                return;
            o->m_normalChildNeedsLayout = true;
        }

        last = o;
        o = o->container();
    }

    last->scheduleRelayout();
}

RenderBlock *RenderObject::containingBlock() const
{
    if(isTableCell())
        return static_cast<RenderBlock*>( parent()->parent()->parent() );
    if (isCanvas())
        return const_cast<RenderBlock*>( static_cast<const RenderBlock*>(this) );

    RenderObject *o = parent();
    if(m_style->position() == FIXED) {
        while ( o && !o->isCanvas() )
            o = o->parent();
    }
    else if(m_style->position() == ABSOLUTE) {
        while (o &&
               ( o->style()->position() == STATIC || ( o->isInline() && !o->isReplaced() ) ) && !o->isCanvas())
            o = o->parent();
    } else {
        while(o && ( ( o->isInline() && !o->isReplaced() ) || o->isTableRow() || o->isTableSection() ||
                       o->isTableCol() || o->isFrameSet() ) )
            o = o->parent();
    }
    // this is just to make sure we return a valid element.
    // the case below should never happen...
    if(!o || !o->isRenderBlock()) {
        if(!isCanvas()) {
#ifndef NDEBUG
            kdDebug( 6040 ) << this << ": " << renderName() << "(RenderObject): No containingBlock!" << endl;
            kdDebug( 6040 ) << kdBacktrace() << endl;
            const RenderObject* p = this;
            while (p->parent()) p = p->parent();
            p->printTree();
#endif
        }
        return 0L;
    }

    return static_cast<RenderBlock*>( o );
}

short RenderObject::containingBlockWidth() const
{
    // ###
    return containingBlock()->contentWidth();
}

int RenderObject::containingBlockHeight() const
{
    // ###
    return containingBlock()->contentHeight();
}

bool RenderObject::sizesToMaxWidth() const
{
    // Marquees in WinIE are like a mixture of blocks and inline-blocks.  They size as though they're blocks,
    // but they allow text to sit on the same line as the marquee.
    if (isFloating() || isCompact() ||
        (isInlineBlockOrInlineTable() && !isHTMLMarquee()) ||
        (element() && (element()->id() == ID_BUTTON || element()->id() == ID_LEGEND)))
        return true;

    // Children of a horizontal marquee do not fill the container by default.
    // FIXME: Need to deal with MAUTO value properly.  It could be vertical.
    if (parent()->style()->overflow() == OMARQUEE) {
        EMarqueeDirection dir = parent()->style()->marqueeDirection();
        if (dir == MAUTO || dir == MFORWARD || dir == MBACKWARD || dir == MLEFT || dir == MRIGHT)
            return true;
    }

#ifdef APPLE_CHANGES	// ### what the heck is a flexbox?
    // Flexible horizontal boxes lay out children at their maxwidths.  Also vertical boxes
    // that don't stretch their kids lay out their children at their maxwidths.
    if (parent()->isFlexibleBox() &&
        (parent()->style()->boxOrient() == HORIZONTAL || parent()->style()->boxAlign() != BSTRETCH))
        return true;
#endif

    return false;
}

// from Mozilla's nsCSSColorUtils.cpp
static int brightness(int red, int green, int blue)
{

  int intensity = (red + green + blue) / 3;

  int luminosity =
    ((RED_LUMINOSITY * red) / 100) +
    ((GREEN_LUMINOSITY * green) / 100) +
    ((BLUE_LUMINOSITY * blue) / 100);

  return ((intensity * INTENSITY_FACTOR) +
          (luminosity * LUMINOSITY_FACTOR)) / 100;
}

static void calc3DColor(QColor &color, bool darken)
{
  int rb = color.red();
  int gb = color.green();
  int bb = color.blue();

  int brightness_ = brightness(rb,gb,bb);

  int f0, f1;
  if (brightness_ < COLOR_DARK_THRESHOLD) {
    f0 = COLOR_DARK_BS_FACTOR;
    f1 = COLOR_DARK_TS_FACTOR;
  } else if (brightness_ > COLOR_LIGHT_THRESHOLD) {
    f0 = COLOR_LITE_BS_FACTOR;
    f1 = COLOR_LITE_TS_FACTOR;
  } else {
    f0 = COLOR_DARK_BS_FACTOR +
      (brightness_ *
       (COLOR_LITE_BS_FACTOR - COLOR_DARK_BS_FACTOR) / MAX_COLOR);
    f1 = COLOR_DARK_TS_FACTOR +
      (brightness_ *
       (COLOR_LITE_TS_FACTOR - COLOR_DARK_TS_FACTOR) / MAX_COLOR);
  }

  if (darken) {
    int r = rb - (f0 * rb / 100);
    int g = gb - (f0 * gb / 100);
    int b = bb - (f0 * bb / 100);
    if ((r == rb) && (g == gb) && (b == bb))
      color = (color == Qt::black) ? DARK_GRAY : Qt::black;
    else
      color.setRgb(r, g, b);
  } else {
    int r = kMin(rb + (f1 * (MAX_COLOR - rb) / 100), 255);
    int g = kMin(gb + (f1 * (MAX_COLOR - gb) / 100), 255);
    int b = kMin(bb + (f1 * (MAX_COLOR - bb) / 100), 255);
    if ((r == rb) && (g == gb) && (b == bb))
      color = (color == Qt::white) ? LIGHT_GRAY : Qt::white;
    else
      color.setRgb(r, g, b);
  }
}

void RenderObject::drawBorder(QPainter *p, int x1, int y1, int x2, int y2,
                              BorderSide s, QColor c, const QColor& textcolor, EBorderStyle style,
                              int adjbw1, int adjbw2, bool invalidisInvert)
{
    int width = (s==BSTop||s==BSBottom?y2-y1:x2-x1);

    if(style == DOUBLE && width < 3)
        style = SOLID;

    if(!c.isValid()) {
        if(invalidisInvert)
        {
            p->setRasterOp(Qt::XorROP);
            c = Qt::white;
        }
        else {
            if(style == INSET || style == OUTSET || style == RIDGE || style ==
            GROOVE)
                c = Qt::white;
            else
                c = textcolor;
        }
    }

    switch(style)
    {
    case BNATIVE:
    case BNONE:
    case BHIDDEN:
        // should not happen
        if(invalidisInvert && p->rasterOp() == Qt::XorROP)
            p->setRasterOp(Qt::CopyROP);

        return;
    case DOTTED:
        if ( width == 1 ) {
            // workaround Qt brokenness
            p->setPen(QPen(c, width, Qt::SolidLine));
            switch(s) {
            case BSBottom:
            case BSTop:
                for ( ; x1 < x2; x1 += 2 )
                    p->drawPoint( x1, y1 );
                break;
            case BSRight:
            case BSLeft:
                for ( ; y1 < y2; y1 += 2 )
                    p->drawPoint( x1, y1 );
            }
            break;
        }

        p->setPen(QPen(c, width, Qt::DotLine));
        /* nobreak; */
    case DASHED:
        if(style == DASHED)
            p->setPen(QPen(c, width == 1 ? 0 : width, width == 1 ? Qt::DotLine : Qt::DashLine));

        if (width > 0)
            switch(s) {
            case BSBottom:
            case BSTop:
                p->drawLine(x1, (y1+y2)/2, x2, (y1+y2)/2);
                break;
            case BSRight:
            case BSLeft:
                p->drawLine((x1+x2)/2, y1, (x1+x2)/2, y2);
                break;
            }

        break;
    case DOUBLE:
    {
        int third = (width+1)/3;

        if (adjbw1 == 0 && adjbw2 == 0)
        {
            p->setPen(Qt::NoPen);
            p->setBrush(c);
            switch(s)
            {
            case BSTop:
            case BSBottom:
                p->drawRect(x1, y1      , x2-x1, third);
                p->drawRect(x1, y2-third, x2-x1, third);
                break;
            case BSLeft:
                p->drawRect(x1      , y1+1, third, y2-y1-1);
                p->drawRect(x2-third, y1+1, third, y2-y1-1);
                break;
            case BSRight:
                p->drawRect(x1      , y1+1, third, y2-y1-1);
                p->drawRect(x2-third, y1+1, third, y2-y1-1);
                break;
            }
        }
        else
        {
            int adjbw1bigthird;
            if (adjbw1>0) adjbw1bigthird = adjbw1+1;
            else adjbw1bigthird = adjbw1 - 1;
            adjbw1bigthird /= 3;

            int adjbw2bigthird;
            if (adjbw2>0) adjbw2bigthird = adjbw2 + 1;
            else adjbw2bigthird = adjbw2 - 1;
            adjbw2bigthird /= 3;