C++ RenderObject::continuation方法代码示例

bool WMLAElement::isKeyboardFocusable(KeyboardEvent* event) const
{
    if (!isFocusable())
        return false;
    
    if (!document()->frame())
        return false;

    if (!document()->frame()->eventHandler()->tabsToLinks(event))
        return false;

    // Before calling absoluteRects, check for the common case where the renderer
    // or one of the continuations is non-empty, since this is a faster check and
    // almost always returns true.
    for (RenderObject* r = renderer(); r; r = r->continuation())
        if (r->width() > 0 && r->height() > 0)
            return true;

    Vector<IntRect> rects;
    FloatPoint absPos = renderer()->localToAbsolute();
    renderer()->absoluteRects(rects, absPos.x(), absPos.y());
    size_t n = rects.size();
    for (size_t i = 0; i < n; ++i)
        if (!rects[i].isEmpty())
            return true;

    return false;
}

bool HTMLAnchorElement::isFocusable() const
{
    if (isContentEditable())
        return HTMLElement::isFocusable();

    // FIXME: Even if we are not visible, we might have a child that is visible.
    // Dave wants to fix that some day with a "has visible content" flag or the like.
    if (!(m_isLink && renderer() && renderer()->style()->visibility() == VISIBLE))
        return false;

    // Before calling absoluteRects, check for the common case where the renderer
    // or one of the continuations is non-empty, since this is a faster check and
    // almost always returns true.
    for (RenderObject* r = renderer(); r; r = r->continuation())
        if (r->width() > 0 && r->height() > 0)
            return true;

    Vector<IntRect> rects;
    int x, y;
    renderer()->absolutePosition(x, y);
    renderer()->absoluteRects(rects, x, y);
    size_t n = rects.size();
    for (size_t i = 0; i < n; ++i)
        if (!rects[i].isEmpty())
            return true;

    return false;
}

Position RenderInline::positionForCoordinates(int x, int y)
{
    for (RenderObject *c = continuation(); c; c = c->continuation()) {
        if (c->isInline() || c->firstChild())
            return c->positionForCoordinates(x, y);
    }

    return RenderFlow::positionForCoordinates(x, y);
}

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 RenderInline::positionForCoordinates(int x, int y)
{
    // Translate the coords from the pre-anonymous block to the post-anonymous block.
    RenderBlock* cb = containingBlock();
    int parentBlockX = cb->xPos() + x;
    int parentBlockY = cb->yPos() + y;
    for (RenderObject* c = continuation(); c; c = c->continuation()) {
        RenderObject* contBlock = c;
        if (c->isInline())
            contBlock = c->containingBlock();
        if (c->isInline() || c->firstChild())
            return c->positionForCoordinates(parentBlockX - contBlock->xPos(), parentBlockY - contBlock->yPos());
    }

    return RenderFlow::positionForCoordinates(x, y);
}