render_container.cpp

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

    bool newContentWanted = pseudo && pseudo->display() != NONE;

    // For <q><p/></q>, if this object is the inline continuation of the <q>,
    // we only want to generate ::after content and not ::before content.
    if (type == RenderStyle::BEFORE && isInlineContinuation())
        newContentWanted = false;

    // Similarly, if we're the beginning of a <q>, and there's an inline continuation for
    // our object, then we don't generate the :after content.
    if (type == RenderStyle::AFTER && isRenderInline() && continuation())
        newContentWanted = false;

    // No generated content
    if (!oldContentPresent && !newContentWanted)
        return;

    // Whether or not we want the same old content.
    bool sameOldContent = oldContentPresent && newContentWanted
                       && (child->style()->contentDataEquivalent(pseudo));

    // No change in content, update style
    if( sameOldContent ) {
        child->setStyle(pseudo);
        return;
    }

    // If we don't want generated content any longer, or if we have generated content,
    // but it's no longer identical to the new content data we want to build
    // render objects for, then we nuke all of the old generated content.
    if (oldContentPresent && (!newContentWanted || !sameOldContent))
    {
        // The child needs to be removed.
        oldContentPresent = false;
        removeChild(child);
        child = (type == RenderStyle::BEFORE) ? firstChild() : lastChild();
    }

    // If we have no pseudo-style or if the pseudo's display type is NONE, then we
    // have no generated content and can now return.
    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);

    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.
    RenderContainer* pseudoContainer = 0;
    pseudoContainer = RenderFlow::createFlow(element(), pseudo, renderArena());
    pseudoContainer->setIsAnonymous( true );
    pseudoContainer->createCSSContent();

    // Only add the container if it had content
    if (pseudoContainer->firstChild()) {
        // 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);
        pseudoContainer->close();
    }
}

void RenderContainer::createCSSContent()
{
    RenderStyle* pseudo = style();
    RenderStyle* style = new RenderStyle();
    style->ref();
    style->inheritFrom(pseudo);

    // 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 (contentData->_contentType == CONTENT_TEXT)
        {
            RenderText* t = new (renderArena()) RenderText( node(), 0);
            t->setIsAnonymous( true );
            t->setStyle(style);
            t->setText(contentData->contentText());
            addChild(t);
        }
        else if (contentData->_contentType == CONTENT_OBJECT)
        {
            RenderImage* img = new (renderArena()) RenderImage(node());
            img->setIsAnonymous( true );
            img->setStyle(style);
            img->setContentObject(contentData->contentObject());
            addChild(img);
        }
        else if (contentData->_contentType == CONTENT_COUNTER)
        {
            RenderCounter* t = new (renderArena()) RenderCounter( node(), contentData->contentCounter() );
            t->setIsAnonymous( true );
            t->setStyle(style);
            addChild(t);
        }
        else if (contentData->_contentType == CONTENT_QUOTE)
        {
            RenderQuote* t = new (renderArena()) RenderQuote( node(), contentData->contentQuote() );
            t->setIsAnonymous( true );
            t->setStyle(style);
            addChild(t);
        }
    }
    style->deref();
}

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.
}

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.
}


void RenderContainer::layout()
{
    KHTMLAssert( needsLayout() );
    KHTMLAssert( minMaxKnown() );
    const bool pagedMode = canvas()->pagedMode();
    RenderObject *child = firstChild();
    while( child ) {
        if (pagedMode) child->setNeedsLayout(true);
        child->layoutIfNeeded();
        if (child->containsPageBreak()) setContainsPageBreak(true);
        if (child->needsPageClear()) setNeedsPageClear(true);
        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();
}

#undef DEBUG_LAYOUT