render_container.cpp

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    if (!newContentWanted)
        return;

    if (isInlineFlow() && pseudo->display() != INLINE)
        // According to the CSS2 spec (the end of section 12.1), the only allowed
        // display values for the pseudo style are NONE and INLINE.  Since we already
        // determined that the pseudo is not display NONE, any display other than
        // inline should be mutated to INLINE.
        pseudo->setDisplay(INLINE);
    
    if (oldContentPresent) {
        if (child && child->style()->styleType() == type) {
            // We have generated content present still.  We want to walk this content and update our
            // style information with the new pseudo style.
            child->setStyle(pseudo);

            // Note that if we ever support additional types of generated content (which should be way off
            // in the future), this code will need to be patched.
            for (RenderObject* genChild = child->firstChild(); genChild; genChild = genChild->nextSibling()) {
                if (genChild->isText())
                    // Generated text content is a child whose style also needs to be set to the pseudo
                    // style.
                    genChild->setStyle(pseudo);
                else {
                    // Images get an empty style that inherits from the pseudo.
                    RenderStyle* style = new (renderArena()) RenderStyle();
                    style->inheritFrom(pseudo);
                    genChild->setStyle(style);
                }
            }
        }
        return; // We've updated the generated content. That's all we needed to do.
    }
    
    RenderObject* insertBefore = (type == RenderStyle::BEFORE) ? child : 0;

    // Generated content consists of a single container that houses multiple children (specified
    // by the content property).  This pseudo container gets the pseudo style set on it.
    RenderObject* pseudoContainer = 0;
    
    // Now walk our list of generated content and create render objects for every type
    // we encounter.
    for (ContentData* contentData = pseudo->contentData();
         contentData; contentData = contentData->_nextContent) {
        if (!pseudoContainer)
            pseudoContainer = RenderFlow::createAnonymousFlow(document(), pseudo); /* anonymous box */
        
        if (contentData->contentType() == CONTENT_TEXT)
        {
            RenderText* t = new (renderArena()) RenderTextFragment(document() /*anonymous object */, contentData->contentText());
            t->setStyle(pseudo);
            pseudoContainer->addChild(t);
        }
        else if (contentData->contentType() == CONTENT_OBJECT)
        {
            RenderImage* img = new (renderArena()) RenderImage(document()); /* Anonymous object */
            RenderStyle* style = new (renderArena()) RenderStyle();
            style->inheritFrom(pseudo);
            img->setStyle(style);
            img->setContentObject(contentData->contentObject());
            pseudoContainer->addChild(img);
        }
    }

    if (pseudoContainer) {
        // Add the pseudo after we've installed all our content, so that addChild will be able to find the text
        // inside the inline for e.g., first-letter styling.
        addChild(pseudoContainer, insertBefore);
    }
}


void RenderContainer::appendChildNode(RenderObject* newChild)
{
    KHTMLAssert(newChild->parent() == 0);

    newChild->setParent(this);
    RenderObject* lChild = lastChild();

    if(lChild)
    {
        newChild->setPreviousSibling(lChild);
        lChild->setNextSibling(newChild);
    }
    else
        setFirstChild(newChild);

    setLastChild(newChild);
    
    // Keep our layer hierarchy updated.  Optimize for the common case where we don't have any children
    // and don't have a layer attached to ourselves.
    if (newChild->firstChild() || newChild->layer()) {
        RenderLayer* layer = enclosingLayer();
        newChild->addLayers(layer, newChild);
    }
    
    newChild->setNeedsLayoutAndMinMaxRecalc(); // Goes up the containing block hierarchy.
    if (!normalChildNeedsLayout())
        setChildNeedsLayout(true); // We may supply the static position for an absolute positioned child.
    
    if (!newChild->isFloatingOrPositioned() && childrenInline())
        dirtyLinesFromChangedChild(newChild);
    
#if APPLE_CHANGES
    if (KWQAccObjectCache::accessibilityEnabled())
        document()->getAccObjectCache()->childrenChanged(this);
#endif
}

void RenderContainer::insertChildNode(RenderObject* child, RenderObject* beforeChild)
{
    if(!beforeChild) {
        appendChildNode(child);
        return;
    }

    KHTMLAssert(!child->parent());
    while ( beforeChild->parent() != this && beforeChild->parent()->isAnonymousBlock() )
	beforeChild = beforeChild->parent();
    KHTMLAssert(beforeChild->parent() == this);

    if(beforeChild == firstChild())
        setFirstChild(child);

    RenderObject* prev = beforeChild->previousSibling();
    child->setNextSibling(beforeChild);
    beforeChild->setPreviousSibling(child);
    if(prev) prev->setNextSibling(child);
    child->setPreviousSibling(prev);

    child->setParent(this);
    
    // Keep our layer hierarchy updated.
    RenderLayer* layer = enclosingLayer();
    child->addLayers(layer, child);

    child->setNeedsLayoutAndMinMaxRecalc();
    if (!normalChildNeedsLayout())
        setChildNeedsLayout(true); // We may supply the static position for an absolute positioned child.
    
    if (!child->isFloatingOrPositioned() && childrenInline())
        dirtyLinesFromChangedChild(child);
    
#if APPLE_CHANGES
    if (KWQAccObjectCache::accessibilityEnabled())
        document()->getAccObjectCache()->childrenChanged(this);
#endif    
}

void RenderContainer::layout()
{
    KHTMLAssert( needsLayout() );
    KHTMLAssert( minMaxKnown() );

    RenderObject *child = firstChild();
    while( child ) {
        child->layoutIfNeeded();
        child = child->nextSibling();
    }
    setNeedsLayout(false);
}

void RenderContainer::removeLeftoverAnonymousBoxes()
{
    // we have to go over all child nodes and remove anonymous boxes, that do _not_
    // have inline children to keep the tree flat
    RenderObject *child = firstChild();
    while( child ) {
	RenderObject *next = child->nextSibling();
	
	if ( child->isRenderBlock() && child->isAnonymousBlock() && !child->continuation() && !child->childrenInline() && !child->isTableCell() ) {
	    RenderObject *firstAnChild = child->firstChild();
	    RenderObject *lastAnChild = child->lastChild();
	    if ( firstAnChild ) {
		RenderObject *o = firstAnChild;
		while( o ) {
		    o->setParent( this );
		    o = o->nextSibling();
		}
		firstAnChild->setPreviousSibling( child->previousSibling() );
		lastAnChild->setNextSibling( child->nextSibling() );
		if ( child->previousSibling() )
		    child->previousSibling()->setNextSibling( firstAnChild );
		if ( child->nextSibling() )
		    child->nextSibling()->setPreviousSibling( lastAnChild );
	    } else {
		if ( child->previousSibling() )
		    child->previousSibling()->setNextSibling( child->nextSibling() );
		if ( child->nextSibling() )
		    child->nextSibling()->setPreviousSibling( child->previousSibling() );
		
	    }
	    if ( child == firstChild() )
		m_first = firstAnChild;
	    if ( child == lastChild() )
		m_last = lastAnChild;
	    child->setParent( 0 );
	    child->setPreviousSibling( 0 );
	    child->setNextSibling( 0 );
	    if ( !child->isText() ) {
		RenderContainer *c = static_cast<RenderContainer *>(child);
		c->m_first = 0;
		c->m_next = 0;
	    }
	    child->detach();
	}
	child = next;
    }
    if ( parent() )
	parent()->removeLeftoverAnonymousBoxes();
}

VisiblePosition RenderContainer::positionForCoordinates(int _x, int _y)
{
    // no children...return this render object's element, if there is one, and offset 0
    if (!firstChild())
        return VisiblePosition(element(), 0, DOWNSTREAM);

    // look for the geometrically-closest child and pass off to that child
    int min = INT_MAX;
    RenderObject *closestRenderer = 0;
    for (RenderObject *renderer = firstChild(); renderer; renderer = renderer->nextSibling()) {
        if (!renderer->firstChild() && !renderer->isInline() && !renderer->isBlockFlow())
            continue;

        int absx, absy;
        renderer->absolutePosition(absx, absy);
        
        int top = absy + borderTop() + paddingTop();
        int bottom = top + renderer->contentHeight();
        int left = absx + borderLeft() + paddingLeft();
        int right = left + renderer->contentWidth();
        
        int cmp;
        cmp = abs(_y - top);    if (cmp < min) { closestRenderer = renderer; min = cmp; }
        cmp = abs(_y - bottom); if (cmp < min) { closestRenderer = renderer; min = cmp; }
        cmp = abs(_x - left);   if (cmp < min) { closestRenderer = renderer; min = cmp; }
        cmp = abs(_x - right);  if (cmp < min) { closestRenderer = renderer; min = cmp; }
    }
    
    if (closestRenderer)
        return closestRenderer->positionForCoordinates(_x, _y);
    
    return VisiblePosition(element(), 0, DOWNSTREAM);
}
    
#undef DEBUG_LAYOUT