MediaQueryList.cpp [plain text]
#include "config.h"
#include "MediaQueryList.h"
#include "EventNames.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(MediaQueryList);
MediaQueryList::MediaQueryList(Document& document, MediaQueryMatcher& matcher, Ref<MediaQuerySet>&& media, bool matches)
: ActiveDOMObject(&document)
, m_matcher(&matcher)
, m_media(WTFMove(media))
, m_evaluationRound(matcher.evaluationRound())
, m_changeRound(m_evaluationRound - 1) , m_matches(matches)
{
matcher.addMediaQueryList(*this);
}
Ref<MediaQueryList> MediaQueryList::create(Document& document, MediaQueryMatcher& matcher, Ref<MediaQuerySet>&& media, bool matches)
{
auto list = adoptRef(*new MediaQueryList(document, matcher, WTFMove(media), matches));
list->suspendIfNeeded();
return list;
}
MediaQueryList::~MediaQueryList()
{
if (m_matcher)
m_matcher->removeMediaQueryList(*this);
}
void MediaQueryList::detachFromMatcher()
{
m_matcher = nullptr;
}
String MediaQueryList::media() const
{
return m_media->mediaText();
}
void MediaQueryList::addListener(RefPtr<EventListener>&& listener)
{
if (!listener)
return;
addEventListener(eventNames().changeEvent, listener.releaseNonNull());
}
void MediaQueryList::removeListener(RefPtr<EventListener>&& listener)
{
if (!listener)
return;
removeEventListener(eventNames().changeEvent, *listener);
}
void MediaQueryList::evaluate(MediaQueryEvaluator& evaluator, bool& notificationNeeded)
{
if (!m_matcher) {
notificationNeeded = false;
return;
}
if (m_evaluationRound != m_matcher->evaluationRound())
setMatches(evaluator.evaluate(m_media.get()));
notificationNeeded = m_changeRound == m_matcher->evaluationRound();
}
void MediaQueryList::setMatches(bool newValue)
{
ASSERT(m_matcher);
m_evaluationRound = m_matcher->evaluationRound();
if (newValue == m_matches)
return;
m_matches = newValue;
m_changeRound = m_evaluationRound;
}
bool MediaQueryList::matches()
{
if (m_matcher && m_evaluationRound != m_matcher->evaluationRound())
setMatches(m_matcher->evaluate(m_media.get()));
return m_matches;
}
void MediaQueryList::eventListenersDidChange()
{
m_hasChangeEventListener = hasEventListeners(eventNames().changeEvent);
}
const char* MediaQueryList::activeDOMObjectName() const
{
return "MediaQueryList";
}
bool MediaQueryList::virtualHasPendingActivity() const
{
return m_hasChangeEventListener && m_matcher;
}
}