MutationObserverRegistration.cpp [plain text]
#include "config.h"
#include "MutationObserverRegistration.h"
#include "Document.h"
#include "QualifiedName.h"
namespace WebCore {
MutationObserverRegistration::MutationObserverRegistration(PassRefPtr<MutationObserver> observer, Node* registrationNode, MutationObserverOptions options, const HashSet<AtomicString>& attributeFilter)
: m_observer(observer)
, m_registrationNode(registrationNode)
, m_options(options)
, m_attributeFilter(attributeFilter)
{
m_observer->observationStarted(*this);
}
MutationObserverRegistration::~MutationObserverRegistration()
{
clearTransientRegistrations();
m_observer->observationEnded(*this);
}
void MutationObserverRegistration::resetObservation(MutationObserverOptions options, const HashSet<AtomicString>& attributeFilter)
{
clearTransientRegistrations();
m_options = options;
m_attributeFilter = attributeFilter;
}
void MutationObserverRegistration::observedSubtreeNodeWillDetach(Node* node)
{
if (!isSubtree())
return;
node->registerTransientMutationObserver(this);
m_observer->setHasTransientRegistration();
if (!m_transientRegistrationNodes) {
m_transientRegistrationNodes = std::make_unique<NodeHashSet>();
ASSERT(!m_registrationNodeKeepAlive);
m_registrationNodeKeepAlive = m_registrationNode; }
m_transientRegistrationNodes->add(node);
}
void MutationObserverRegistration::clearTransientRegistrations()
{
if (!m_transientRegistrationNodes) {
ASSERT(!m_registrationNodeKeepAlive);
return;
}
for (auto& node : *m_transientRegistrationNodes)
node->unregisterTransientMutationObserver(this);
m_transientRegistrationNodes = nullptr;
ASSERT(m_registrationNodeKeepAlive);
m_registrationNodeKeepAlive = nullptr; }
void MutationObserverRegistration::unregisterAndDelete(MutationObserverRegistration* registry)
{
RefPtr<Node> registrationNode(registry->m_registrationNode);
registrationNode->unregisterMutationObserver(registry);
}
bool MutationObserverRegistration::shouldReceiveMutationFrom(Node* node, MutationObserver::MutationType type, const QualifiedName* attributeName) const
{
ASSERT((type == MutationObserver::Attributes && attributeName) || !attributeName);
if (!(m_options & type))
return false;
if (m_registrationNode != node && !isSubtree())
return false;
if (type != MutationObserver::Attributes || !(m_options & MutationObserver::AttributeFilter))
return true;
if (!attributeName->namespaceURI().isNull())
return false;
return m_attributeFilter.contains(attributeName->localName());
}
void MutationObserverRegistration::addRegistrationNodesToSet(HashSet<Node*>& nodes) const
{
nodes.add(m_registrationNode);
if (!m_transientRegistrationNodes)
return;
for (auto& node : *m_transientRegistrationNodes)
nodes.add(node.get());
}
}