diff options
Diffstat (limited to 'WebCore/css/MediaQueryMatcher.cpp')
-rw-r--r-- | WebCore/css/MediaQueryMatcher.cpp | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/WebCore/css/MediaQueryMatcher.cpp b/WebCore/css/MediaQueryMatcher.cpp new file mode 100644 index 0000000..e076837 --- /dev/null +++ b/WebCore/css/MediaQueryMatcher.cpp @@ -0,0 +1,156 @@ +/* + * 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 "MediaQueryMatcher.h" + +#include "CSSStyleSelector.h" +#include "Document.h" +#include "Element.h" +#include "FrameView.h" +#include "MediaList.h" +#include "MediaQueryEvaluator.h" +#include "MediaQueryList.h" +#include "MediaQueryListListener.h" + +namespace WebCore { + +MediaQueryMatcher::Listener::Listener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<MediaQueryList> query) + : m_listener(listener) + , m_query(query) +{ +} + +MediaQueryMatcher::Listener::~Listener() +{ +} + +void MediaQueryMatcher::Listener::evaluate(ScriptState* state, MediaQueryEvaluator* evaluator) +{ + bool notify; + m_query->evaluate(evaluator, notify); + if (notify) + m_listener->queryChanged(state, m_query.get()); +} + +MediaQueryMatcher::MediaQueryMatcher(Document* document) + : m_document(document) + , m_evaluationRound(1) +{ + ASSERT(m_document); +} + +MediaQueryMatcher::~MediaQueryMatcher() +{ +} + +void MediaQueryMatcher::documentDestroyed() +{ + m_listeners.clear(); + m_document = 0; +} + +String MediaQueryMatcher::mediaType() const +{ + if (!m_document || !m_document->frame() || !m_document->frame()->view()) + return String(); + + return m_document->frame()->view()->mediaType(); +} + +PassOwnPtr<MediaQueryEvaluator> MediaQueryMatcher::prepareEvaluator() const +{ + if (!m_document || !m_document->frame()) + return 0; + + Element* documentElement = m_document->documentElement(); + if (!documentElement) + return 0; + + CSSStyleSelector* styleSelector = m_document->styleSelector(); + if (!styleSelector) + return 0; + + RefPtr<RenderStyle> rootStyle = styleSelector->styleForElement(documentElement, 0 /*defaultParent*/, false /*allowSharing*/, true /*resolveForRootDefault*/); + + return adoptPtr(new MediaQueryEvaluator(mediaType(), m_document->frame(), rootStyle.get())); +} + +bool MediaQueryMatcher::evaluate(MediaList* media) +{ + if (!media) + return false; + + OwnPtr<MediaQueryEvaluator> evaluator(prepareEvaluator()); + return evaluator && evaluator->eval(media); +} + +PassRefPtr<MediaQueryList> MediaQueryMatcher::matchMedia(const String& query) +{ + if (!m_document) + return 0; + + RefPtr<MediaList> media = MediaList::create(query, false); + return MediaQueryList::create(this, media, evaluate(media.get())); +} + +void MediaQueryMatcher::addListener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<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(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::styleSelectorChanged() +{ + ASSERT(m_document); + + ScriptState* scriptState = mainWorldScriptState(m_document->frame()); + if (!scriptState) + return; + + ++m_evaluationRound; + OwnPtr<MediaQueryEvaluator> evaluator = prepareEvaluator(); + if (!evaluator) + return; + + for (size_t i = 0; i < m_listeners.size(); ++i) + m_listeners[i]->evaluate(scriptState, evaluator.get()); +} + +} |