render_flow.cpp

khtml在gtk上的移植版本

            return lh.minWidth(s->font().pixelSize());
        return lh.value;
    }

    if (m_lineHeight == -1)
        m_lineHeight = RenderObject::lineHeight(false);
    return m_lineHeight;
}

void RenderFlow::dirtyLineBoxes(bool fullLayout, bool isRootLineBox)
{
    if (!isRootLineBox && isReplaced())
        return RenderBox::dirtyLineBoxes(isRootLineBox);
    
    if (fullLayout)
        deleteLineBoxes();
    else {
        for (InlineRunBox* curr = firstLineBox(); curr; curr = curr->nextLineBox())
            curr->dirtyLineBoxes();
    }
}

InlineBox* RenderFlow::createInlineBox(bool makePlaceHolderBox, bool isRootLineBox, bool isOnlyRun)
{
    if (!isRootLineBox &&
	(isReplaced() || makePlaceHolderBox))                     // Inline tables and inline blocks
        return RenderBox::createInlineBox(false, isRootLineBox);  // (or positioned element placeholders).

    InlineFlowBox* flowBox = 0;
    if (isInlineFlow())
        flowBox = new (renderArena()) InlineFlowBox(this);
    else
        flowBox = new (renderArena()) RootInlineBox(this);
    
    if (!m_firstLineBox)
        m_firstLineBox = m_lastLineBox = flowBox;
    else {
        m_lastLineBox->setNextLineBox(flowBox);
        flowBox->setPreviousLineBox(m_lastLineBox);
        m_lastLineBox = flowBox;
    }

    return flowBox;
}

void RenderFlow::paintLineBoxBackgroundBorder(PaintInfo& i, int _tx, int _ty)
{
    if (!shouldPaintWithinRoot(i))
        return;

    if (!firstLineBox())
        return;
 
    if (style()->visibility() == VISIBLE && i.phase == PaintActionForeground) {
        // We can check the first box and last box and avoid painting if we don't
        // intersect.
        int yPos = _ty + firstLineBox()->yPos();
        int h = lastLineBox()->yPos() + lastLineBox()->height() - firstLineBox()->yPos();
        if( (yPos >= i.r.y() + i.r.height()) || (yPos + h <= i.r.y()))
            return;

        // See if our boxes intersect with the dirty rect.  If so, then we paint
        // them.  Note that boxes can easily overlap, so we can't make any assumptions
        // based off positions of our first line box or our last line box.
        int xOffsetWithinLineBoxes = 0;
        for (InlineRunBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
            yPos = _ty + curr->yPos();
            h = curr->height();
            if ((yPos < i.r.y() + i.r.height()) && (yPos + h > i.r.y()))
                curr->paintBackgroundAndBorder(i, _tx, _ty, xOffsetWithinLineBoxes);
            xOffsetWithinLineBoxes += curr->width();
        }
    }
}

void RenderFlow::paintLineBoxDecorations(PaintInfo& i, int _tx, int _ty, bool paintedChildren)
{
    if (!shouldPaintWithinRoot(i))
        return;

    // We only paint line box decorations in strict or almost strict mode.
    // Otherwise we let the InlineTextBoxes paint their own decorations.
    if (style()->htmlHacks() || !firstLineBox())
        return;

    if (style()->visibility() == VISIBLE && i.phase == PaintActionForeground) {
        // We can check the first box and last box and avoid painting if we don't
        // intersect.
        int yPos = _ty + firstLineBox()->yPos();;
        int h = lastLineBox()->yPos() + lastLineBox()->height() - firstLineBox()->yPos();
        if( (yPos >= i.r.y() + i.r.height()) || (yPos + h <= i.r.y()))
            return;

        // See if our boxes intersect with the dirty rect.  If so, then we paint
        // them.  Note that boxes can easily overlap, so we can't make any assumptions
        // based off positions of our first line box or our last line box.
        for (InlineRunBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
            yPos = _ty + curr->yPos();
            h = curr->height();
            if ((yPos < i.r.y() + i.r.height()) && (yPos + h > i.r.y()))
                curr->paintDecorations(i, _tx, _ty, paintedChildren);
        }
    }
}

QRect RenderFlow::getAbsoluteRepaintRect()
{
    if (isInlineFlow()) {
        // Find our leftmost position.
        int left = 0;
        int top = firstLineBox() ? firstLineBox()->yPos() : 0;
        for (InlineRunBox* curr = firstLineBox(); curr; curr = curr->nextLineBox())
            if (curr == firstLineBox() || curr->xPos() < left)
                left = curr->xPos();

        // Now invalidate a rectangle.
        int ow = style() ? style()->outlineSize() : 0;
        if (isCompact())
            left -= m_x;
        if (style()->position() == RELATIVE && m_layer)
            m_layer->relativePositionOffset(left, top);

        QRect r(-ow+left, -ow+top, width()+ow*2, height()+ow*2);
        containingBlock()->computeAbsoluteRepaintRect(r);
        if (ow) {
            for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling()) {
                if (!curr->isText()) {
                    QRect childRect = curr->getAbsoluteRepaintRectWithOutline(ow);
                    r = r.unite(childRect);
                }
            }
            
            if (continuation() && !continuation()->isInline()) {
                QRect contRect = continuation()->getAbsoluteRepaintRectWithOutline(ow);
                r = r.unite(contRect);
            }
        }

        return r;
    }
    else {
        if (firstLineBox() && firstLineBox()->topOverflow() < 0) {
            int ow = style() ? style()->outlineSize() : 0;
            QRect r(-ow, -ow+firstLineBox()->topOverflow(),
                    overflowWidth(false)+ow*2,
                    overflowHeight(false)+ow*2-firstLineBox()->topOverflow());
            computeAbsoluteRepaintRect(r);
            return r;
        }
    }

    return RenderBox::getAbsoluteRepaintRect();
}

int
RenderFlow::lowestPosition(bool includeOverflowInterior, bool includeSelf) const
{
    int bottom = RenderBox::lowestPosition(includeOverflowInterior, includeSelf);
    if (!includeOverflowInterior && hasOverflowClip())
        return bottom;

    // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids.
    // For now, we have to descend into all the children, since we may have a huge abs div inside
    // a tiny rel div buried somewhere deep in our child tree.  In this case we have to get to
    // the abs div.
    for (RenderObject *c = firstChild(); c; c = c->nextSibling()) {
        if (!c->isFloatingOrPositioned() && !c->isText()) {
            int lp = c->yPos() + c->lowestPosition(false);
            bottom = kMax(bottom, lp);
        }
    }
    
    return bottom;
}

int RenderFlow::rightmostPosition(bool includeOverflowInterior, bool includeSelf) const
{
    int right = RenderBox::rightmostPosition(includeOverflowInterior, includeSelf);
    if (!includeOverflowInterior && hasOverflowClip())
        return right;

    // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids.
    // For now, we have to descend into all the children, since we may have a huge abs div inside
    // a tiny rel div buried somewhere deep in our child tree.  In this case we have to get to
    // the abs div.
    for (RenderObject *c = firstChild(); c; c = c->nextSibling()) {
        if (!c->isFloatingOrPositioned() && !c->isText()) {
            int rp = c->xPos() + c->rightmostPosition(false);
            right = kMax(right, rp);
        }
    }
    
    return right;
}

int RenderFlow::leftmostPosition(bool includeOverflowInterior, bool includeSelf) const
{
    int left = RenderBox::leftmostPosition(includeOverflowInterior, includeSelf);
    if (!includeOverflowInterior && hasOverflowClip())
        return left;
    
    // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids.
    // For now, we have to descend into all the children, since we may have a huge abs div inside
    // a tiny rel div buried somewhere deep in our child tree.  In this case we have to get to
    // the abs div.
    for (RenderObject *c = firstChild(); c; c = c->nextSibling()) {
        if (!c->isFloatingOrPositioned() && !c->isText()) {
            int lp = c->xPos() + c->leftmostPosition(false);
            left = kMin(left, lp);
        }
    }
    
    return left;
}

void RenderFlow::caretPos(int offset, bool override, int &_x, int &_y, int &width, int &height)
{
    if (firstChild() || style()->display() == INLINE) {
        // Do the normal calculation
        RenderBox::caretPos(offset, override, _x, _y, width, height);
        return;
    }

    // This is a special case:
    // The element is not an inline element, and it's empty. So we have to
    // calculate a fake position to indicate where objects are to be inserted.
    
    // EDIT FIXME: this does neither take into regard :first-line nor :first-letter
    // However, as soon as some content is entered, the line boxes will be
    // constructed properly and this kludge is not called any more. So only
    // the caret size of an empty :first-line'd block is wrong, but I think we
    // can live with that.
    RenderStyle *currentStyle = style(true);
    //height = currentStyle->fontMetrics().height();
    height = lineHeight(true);
    width = 1;

    // EDIT FIXME: This needs to account for text direction
    int w = this->width();
    switch (currentStyle->textAlign()) {
        case LEFT:
        case KHTML_LEFT:
        case TAAUTO:
        case JUSTIFY:
            _x = 0;
            break;
        case CENTER:
        case KHTML_CENTER:
            _x = w / 2;
        break;
        case RIGHT:
        case KHTML_RIGHT:
            _x = w;
        break;
    }
    
    _y = 0;
    
    int absx, absy;
    absolutePosition(absx, absy, false);
    _x += absx + paddingLeft() + borderLeft();
    _y += absy + paddingTop() + borderTop();
}