MediaQueryList.cpp [plain text]
#include "config.h"
#include "MediaQueryList.h"
#include "MediaList.h"
#include "MediaQueryEvaluator.h"
#include "MediaQueryListListener.h"
#include "MediaQueryMatcher.h"
namespace WebCore {
PassRefPtr<MediaQueryList> MediaQueryList::create(PassRefPtr<MediaQueryMatcher> vector, PassRefPtr<MediaQuerySet> media, bool matches)
{
return adoptRef(new MediaQueryList(vector, media, matches));
}
MediaQueryList::MediaQueryList(PassRefPtr<MediaQueryMatcher> vector, PassRefPtr<MediaQuerySet> media, bool matches)
: m_matcher(vector)
, m_media(media)
, m_evaluationRound(m_matcher->evaluationRound())
, m_changeRound(m_evaluationRound - 1) , m_matches(matches)
{
}
MediaQueryList::~MediaQueryList()
{
}
String MediaQueryList::media() const
{
return m_media->mediaText();
}
void MediaQueryList::addListener(PassRefPtr<MediaQueryListListener> listener)
{
if (!listener)
return;
m_matcher->addListener(listener, this);
}
void MediaQueryList::removeListener(PassRefPtr<MediaQueryListListener> listener)
{
if (!listener)
return;
m_matcher->removeListener(listener.get(), this);
}
void MediaQueryList::evaluate(MediaQueryEvaluator* evaluator, bool& notificationNeeded)
{
if (m_evaluationRound != m_matcher->evaluationRound() && evaluator)
setMatches(evaluator->eval(m_media.get()));
notificationNeeded = m_changeRound == m_matcher->evaluationRound();
}
void MediaQueryList::setMatches(bool newValue)
{
m_evaluationRound = m_matcher->evaluationRound();
if (newValue == m_matches)
return;
m_matches = newValue;
m_changeRound = m_evaluationRound;
}
bool MediaQueryList::matches()
{
if (m_evaluationRound != m_matcher->evaluationRound())
setMatches(m_matcher->evaluate(m_media.get()));
return m_matches;
}
}