VisitedLinkState.cpp [plain text]
#include "config.h"
#include "VisitedLinkState.h"
#include "Frame.h"
#include "HTMLAnchorElement.h"
#include "HTMLNames.h"
#include "NodeTraversal.h"
#include "Page.h"
#include "PageGroup.h"
#include "PlatformStrategies.h"
#include "VisitedLinkStrategy.h"
namespace WebCore {
using namespace HTMLNames;
inline static const AtomicString* linkAttribute(Element* element)
{
if (!element->isLink())
return 0;
if (element->isHTMLElement())
return &element->fastGetAttribute(HTMLNames::hrefAttr);
if (element->isSVGElement())
return &element->getAttribute(XLinkNames::hrefAttr);
return 0;
}
PassOwnPtr<VisitedLinkState> VisitedLinkState::create(Document* document)
{
return adoptPtr(new VisitedLinkState(document));
}
VisitedLinkState::VisitedLinkState(Document* document)
: m_document(document)
{
}
void VisitedLinkState::invalidateStyleForAllLinks()
{
if (m_linksCheckedForVisitedState.isEmpty())
return;
for (Element* element = ElementTraversal::firstWithin(m_document); element; element = ElementTraversal::next(element)) {
if (element->isLink())
element->setNeedsStyleRecalc();
}
}
inline static LinkHash linkHashForElement(Document* document, Element* element)
{
if (element->hasTagName(aTag))
return static_cast<HTMLAnchorElement*>(element)->visitedLinkHash();
if (const AtomicString* attribute = linkAttribute(element))
return WebCore::visitedLinkHash(document->baseURL(), *attribute);
return 0;
}
void VisitedLinkState::invalidateStyleForLink(LinkHash linkHash)
{
if (!m_linksCheckedForVisitedState.contains(linkHash))
return;
for (Element* element = ElementTraversal::firstWithin(m_document); element; element = ElementTraversal::next(element)) {
if (linkHashForElement(m_document, element) == linkHash)
element->setNeedsStyleRecalc();
}
}
EInsideLink VisitedLinkState::determineLinkStateSlowCase(Element* element)
{
ASSERT(element->isLink());
const AtomicString* attribute = linkAttribute(element);
if (!attribute || attribute->isNull())
return NotInsideLink;
if (attribute->isEmpty())
return InsideVisitedLink;
LinkHash hash;
if (element->hasTagName(aTag))
hash = static_cast<HTMLAnchorElement*>(element)->visitedLinkHash();
else
hash = WebCore::visitedLinkHash(element->document()->baseURL(), *attribute);
if (!hash)
return InsideUnvisitedLink;
Frame* frame = element->document()->frame();
if (!frame)
return InsideUnvisitedLink;
Page* page = frame->page();
if (!page)
return InsideUnvisitedLink;
m_linksCheckedForVisitedState.add(hash);
return platformStrategies()->visitedLinkStrategy()->isLinkVisited(page, hash, element->document()->baseURL(), *attribute) ? InsideVisitedLink : InsideUnvisitedLink;
}
}