128 lines
3.4 KiB
C++
128 lines
3.4 KiB
C++
/*
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* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "MediaQueryList.h"
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#include "AddEventListenerOptions.h"
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#include "EventNames.h"
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#include <wtf/IsoMallocInlines.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(MediaQueryList);
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MediaQueryList::MediaQueryList(Document& document, MediaQueryMatcher& matcher, Ref<MediaQuerySet>&& media, bool matches)
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: ActiveDOMObject(&document)
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, m_matcher(&matcher)
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, m_media(WTFMove(media))
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, m_evaluationRound(matcher.evaluationRound())
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, m_changeRound(m_evaluationRound - 1) // Any value that is not the same as m_evaluationRound would do.
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, m_matches(matches)
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{
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matcher.addMediaQueryList(*this);
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}
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Ref<MediaQueryList> MediaQueryList::create(Document& document, MediaQueryMatcher& matcher, Ref<MediaQuerySet>&& media, bool matches)
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{
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auto list = adoptRef(*new MediaQueryList(document, matcher, WTFMove(media), matches));
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list->suspendIfNeeded();
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return list;
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}
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MediaQueryList::~MediaQueryList()
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{
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if (m_matcher)
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m_matcher->removeMediaQueryList(*this);
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}
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void MediaQueryList::detachFromMatcher()
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{
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m_matcher = nullptr;
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}
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String MediaQueryList::media() const
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{
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return m_media->mediaText();
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}
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void MediaQueryList::addListener(RefPtr<EventListener>&& listener)
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{
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if (!listener)
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return;
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addEventListener(eventNames().changeEvent, listener.releaseNonNull(), { });
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}
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void MediaQueryList::removeListener(RefPtr<EventListener>&& listener)
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{
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if (!listener)
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return;
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removeEventListener(eventNames().changeEvent, *listener, { });
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}
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void MediaQueryList::evaluate(MediaQueryEvaluator& evaluator, bool& notificationNeeded)
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{
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if (!m_matcher) {
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notificationNeeded = false;
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return;
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}
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if (m_evaluationRound != m_matcher->evaluationRound())
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setMatches(evaluator.evaluate(m_media.get()));
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notificationNeeded = m_changeRound == m_matcher->evaluationRound();
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}
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void MediaQueryList::setMatches(bool newValue)
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{
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ASSERT(m_matcher);
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m_evaluationRound = m_matcher->evaluationRound();
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if (newValue == m_matches)
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return;
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m_matches = newValue;
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m_changeRound = m_evaluationRound;
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}
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bool MediaQueryList::matches()
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{
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if (m_matcher && m_evaluationRound != m_matcher->evaluationRound())
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setMatches(m_matcher->evaluate(m_media.get()));
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return m_matches;
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}
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void MediaQueryList::eventListenersDidChange()
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{
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m_hasChangeEventListener = hasEventListeners(eventNames().changeEvent);
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}
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const char* MediaQueryList::activeDOMObjectName() const
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{
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return "MediaQueryList";
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}
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bool MediaQueryList::virtualHasPendingActivity() const
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{
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return m_hasChangeEventListener && m_matcher;
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}
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}
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