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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 "core/css/MediaQueryMatcher.h"
#include "core/css/MediaList.h"
#include "core/css/MediaQueryEvaluator.h"
#include "core/css/MediaQueryList.h"
#include "core/css/MediaQueryListListener.h"
#include "core/css/resolver/StyleResolver.h"
#include "core/dom/Document.h"
#include "core/frame/FrameView.h"
#include "core/frame/LocalFrame.h"
namespace WebCore {
MediaQueryMatcher::Listener::Listener(PassRefPtrWillBeRawPtr<MediaQueryListListener> listener, PassRefPtrWillBeRawPtr<MediaQueryList> query)
: m_listener(listener)
, m_query(query)
{
}
void MediaQueryMatcher::Listener::evaluate(MediaQueryEvaluator* evaluator)
{
if (m_query->evaluate(evaluator))
m_listener->queryChanged(m_query.get());
}
void MediaQueryMatcher::Listener::trace(Visitor* visitor)
{
visitor->trace(m_listener);
visitor->trace(m_query);
}
MediaQueryMatcher::MediaQueryMatcher(Document* document)
: m_document(document)
, m_evaluationRound(1)
{
ASSERT(m_document);
}
DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MediaQueryMatcher)
void MediaQueryMatcher::documentDestroyed()
{
m_listeners.clear();
m_document = nullptr;
}
AtomicString MediaQueryMatcher::mediaType() const
{
if (!m_document || !m_document->frame() || !m_document->frame()->view())
return nullAtom;
return m_document->frame()->view()->mediaType();
}
PassOwnPtr<MediaQueryEvaluator> MediaQueryMatcher::prepareEvaluator() const
{
if (!m_document || !m_document->frame())
return nullptr;
return adoptPtr(new MediaQueryEvaluator(mediaType(), m_document->frame()));
}
bool MediaQueryMatcher::evaluate(const MediaQuerySet* media)
{
if (!media)
return false;
OwnPtr<MediaQueryEvaluator> evaluator(prepareEvaluator());
return evaluator && evaluator->eval(media);
}
PassRefPtrWillBeRawPtr<MediaQueryList> MediaQueryMatcher::matchMedia(const String& query)
{
if (!m_document)
return nullptr;
RefPtrWillBeRawPtr<MediaQuerySet> media = MediaQuerySet::create(query);
// Add warning message to inspector whenever dpi/dpcm values are used for "screen" media.
reportMediaQueryWarningIfNeeded(m_document, media.get());
return MediaQueryList::create(this, media, evaluate(media.get()));
}
void MediaQueryMatcher::addListener(PassRefPtrWillBeRawPtr<MediaQueryListListener> listener, PassRefPtrWillBeRawPtr<MediaQueryList> query)
{
if (!m_document)
return;
for (size_t i = 0; i < m_listeners.size(); ++i) {
if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query)
return;
}
m_listeners.append(adoptPtrWillBeNoop(new Listener(listener, query)));
}
void MediaQueryMatcher::removeListener(MediaQueryListListener* listener, MediaQueryList* query)
{
if (!m_document)
return;
for (size_t i = 0; i < m_listeners.size(); ++i) {
if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query) {
m_listeners.remove(i);
return;
}
}
}
void MediaQueryMatcher::styleResolverChanged()
{
if (!m_document)
return;
++m_evaluationRound;
OwnPtr<MediaQueryEvaluator> evaluator = prepareEvaluator();
if (!evaluator)
return;
for (size_t i = 0; i < m_listeners.size(); ++i)
m_listeners[i]->evaluate(evaluator.get());
}
void MediaQueryMatcher::trace(Visitor* visitor)
{
visitor->trace(m_document);
// We don't support tracing of vectors of OwnPtrs (ie. Vector<OwnPtr<Listener> >).
// Since this is a transitional object we are just ifdef'ing it out when oilpan is not enabled.
#if ENABLE(OILPAN)
visitor->trace(m_listeners);
#endif
}
}
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