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/*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#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<MediaList> media, bool matches)
{
return adoptRef(new MediaQueryList(vector, media, matches));
}
MediaQueryList::MediaQueryList(PassRefPtr<MediaQueryMatcher> vector, PassRefPtr<MediaList> media, bool matches)
: m_matcher(vector)
, m_media(media)
, m_evaluationRound(m_matcher->evaluationRound())
, m_changeRound(m_evaluationRound - 1) // m_evaluationRound and m_changeRound initial values must be different.
, 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;
}
}
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