| /* |
| * 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 |
| } |
| |
| } |