EventListenerMap.cpp [plain text]
#include "config.h"
#include "EventListenerMap.h"
#include "Event.h"
#include "EventException.h"
#include <wtf/MainThread.h>
#include <wtf/StdLibExtras.h>
#include <wtf/Vector.h>
#ifndef NDEBUG
#include <wtf/Threading.h>
#endif
using namespace WTF;
namespace WebCore {
#ifndef NDEBUG
static Mutex& activeIteratorCountMutex()
{
DEFINE_STATIC_LOCAL(Mutex, mutex, ());
return mutex;
}
void EventListenerMap::assertNoActiveIterators()
{
MutexLocker locker(activeIteratorCountMutex());
ASSERT(!m_activeIteratorCount);
}
#endif
EventListenerMap::EventListenerMap()
#ifndef NDEBUG
: m_activeIteratorCount(0)
#endif
{
}
bool EventListenerMap::isEmpty() const
{
if (m_hashMap)
return m_hashMap->isEmpty();
return !m_singleEventListenerVector;
}
bool EventListenerMap::contains(const AtomicString& eventType) const
{
if (m_hashMap)
return m_hashMap->contains(eventType);
return m_singleEventListenerType == eventType;
}
void EventListenerMap::clear()
{
assertNoActiveIterators();
if (m_hashMap)
m_hashMap.clear();
else {
m_singleEventListenerType = nullAtom;
m_singleEventListenerVector.clear();
}
}
Vector<AtomicString> EventListenerMap::eventTypes() const
{
Vector<AtomicString> types;
if (m_hashMap) {
EventListenerHashMap::iterator it = m_hashMap->begin();
EventListenerHashMap::iterator end = m_hashMap->end();
for (; it != end; ++it)
types.append(it->first);
} else if (m_singleEventListenerVector)
types.append(m_singleEventListenerType);
return types;
}
static bool addListenerToVector(EventListenerVector* vector, PassRefPtr<EventListener> listener, bool useCapture)
{
RegisteredEventListener registeredListener(listener, useCapture);
if (vector->find(registeredListener) != notFound)
return false;
vector->append(registeredListener);
return true;
}
bool EventListenerMap::add(const AtomicString& eventType, PassRefPtr<EventListener> listener, bool useCapture)
{
assertNoActiveIterators();
if (m_singleEventListenerVector && m_singleEventListenerType != eventType) {
ASSERT(!m_hashMap);
m_hashMap = adoptPtr(new EventListenerHashMap);
m_hashMap->add(m_singleEventListenerType, m_singleEventListenerVector.release());
m_singleEventListenerType = nullAtom;
}
if (m_hashMap) {
EventListenerHashMap::AddResult result = m_hashMap->add(eventType, nullptr);
if (result.isNewEntry)
result.iterator->second = adoptPtr(new EventListenerVector);
return addListenerToVector(result.iterator->second.get(), listener, useCapture);
}
if (!m_singleEventListenerVector) {
m_singleEventListenerType = eventType;
m_singleEventListenerVector = adoptPtr(new EventListenerVector);
}
ASSERT(m_singleEventListenerType == eventType);
return addListenerToVector(m_singleEventListenerVector.get(), listener, useCapture);
}
static bool removeListenerFromVector(EventListenerVector* listenerVector, EventListener* listener, bool useCapture, size_t& indexOfRemovedListener)
{
RegisteredEventListener registeredListener(listener, useCapture);
indexOfRemovedListener = listenerVector->find(registeredListener);
if (indexOfRemovedListener == notFound)
return false;
listenerVector->remove(indexOfRemovedListener);
return true;
}
bool EventListenerMap::remove(const AtomicString& eventType, EventListener* listener, bool useCapture, size_t& indexOfRemovedListener)
{
assertNoActiveIterators();
if (!m_hashMap) {
if (m_singleEventListenerType != eventType)
return false;
bool wasRemoved = removeListenerFromVector(m_singleEventListenerVector.get(), listener, useCapture, indexOfRemovedListener);
if (m_singleEventListenerVector->isEmpty()) {
m_singleEventListenerVector.clear();
m_singleEventListenerType = nullAtom;
}
return wasRemoved;
}
EventListenerHashMap::iterator it = m_hashMap->find(eventType);
if (it == m_hashMap->end())
return false;
bool wasRemoved = removeListenerFromVector(it->second.get(), listener, useCapture, indexOfRemovedListener);
if (it->second->isEmpty())
m_hashMap->remove(it);
return wasRemoved;
}
EventListenerVector* EventListenerMap::find(const AtomicString& eventType)
{
assertNoActiveIterators();
if (m_hashMap) {
EventListenerHashMap::iterator it = m_hashMap->find(eventType);
if (it == m_hashMap->end())
return 0;
return it->second.get();
}
if (m_singleEventListenerType == eventType)
return m_singleEventListenerVector.get();
return 0;
}
#if ENABLE(SVG)
static void removeFirstListenerCreatedFromMarkup(EventListenerVector* listenerVector)
{
bool foundListener = false;
for (size_t i = 0; i < listenerVector->size(); ++i) {
if (!listenerVector->at(i).listener->wasCreatedFromMarkup())
continue;
foundListener = true;
listenerVector->remove(i);
break;
}
ASSERT_UNUSED(foundListener, foundListener);
}
void EventListenerMap::removeFirstEventListenerCreatedFromMarkup(const AtomicString& eventType)
{
assertNoActiveIterators();
if (m_hashMap) {
EventListenerHashMap::iterator result = m_hashMap->find(eventType);
ASSERT(result != m_hashMap->end());
EventListenerVector* listenerVector = result->second.get();
ASSERT(listenerVector);
removeFirstListenerCreatedFromMarkup(listenerVector);
if (listenerVector->isEmpty())
m_hashMap->remove(result);
return;
}
ASSERT(m_singleEventListenerVector);
ASSERT(m_singleEventListenerType == eventType);
removeFirstListenerCreatedFromMarkup(m_singleEventListenerVector.get());
if (m_singleEventListenerVector->isEmpty()) {
m_singleEventListenerVector.clear();
m_singleEventListenerType = nullAtom;
}
}
static void copyListenersNotCreatedFromMarkupToTarget(const AtomicString& eventType, EventListenerVector* listenerVector, EventTarget* target)
{
for (size_t i = 0; i < listenerVector->size(); ++i) {
if ((*listenerVector)[i].listener->wasCreatedFromMarkup())
continue;
target->addEventListener(eventType, (*listenerVector)[i].listener, (*listenerVector)[i].useCapture);
}
}
void EventListenerMap::copyEventListenersNotCreatedFromMarkupToTarget(EventTarget* target)
{
assertNoActiveIterators();
if (m_hashMap) {
EventListenerHashMap::iterator end = m_hashMap->end();
for (EventListenerHashMap::iterator it = m_hashMap->begin(); it != end; ++it)
copyListenersNotCreatedFromMarkupToTarget(it->first, it->second.get(), target);
return;
}
if (!m_singleEventListenerVector)
return;
copyListenersNotCreatedFromMarkupToTarget(m_singleEventListenerType, m_singleEventListenerVector.get(), target);
}
#endif // ENABLE(SVG)
EventListenerIterator::EventListenerIterator()
: m_map(0)
, m_index(0)
{
}
EventListenerIterator::EventListenerIterator(EventTarget* target)
: m_map(0)
, m_index(0)
{
ASSERT(target);
EventTargetData* data = target->eventTargetData();
if (!data)
return;
m_map = &data->eventListenerMap;
#ifndef NDEBUG
{
MutexLocker locker(activeIteratorCountMutex());
m_map->m_activeIteratorCount++;
}
#endif
if (m_map->m_hashMap) {
m_mapIterator = m_map->m_hashMap->begin();
m_mapEnd = m_map->m_hashMap->end();
}
}
#ifndef NDEBUG
EventListenerIterator::~EventListenerIterator()
{
if (m_map) {
MutexLocker locker(activeIteratorCountMutex());
m_map->m_activeIteratorCount--;
}
}
#endif
EventListener* EventListenerIterator::nextListener()
{
if (!m_map)
return 0;
if (m_map->m_hashMap) {
for (; m_mapIterator != m_mapEnd; ++m_mapIterator) {
EventListenerVector& listeners = *m_mapIterator->second;
if (m_index < listeners.size())
return listeners[m_index++].listener.get();
m_index = 0;
}
return 0;
}
if (!m_map->m_singleEventListenerVector)
return 0;
EventListenerVector& listeners = *m_map->m_singleEventListenerVector;
if (m_index < listeners.size())
return listeners[m_index++].listener.get();
return 0;
}
}