1/* 2 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 */ 19 20#include "config.h" 21#include "MediaQueryMatcher.h" 22 23#include "Document.h" 24#include "Element.h" 25#include "Frame.h" 26#include "FrameView.h" 27#include "MediaList.h" 28#include "MediaQueryEvaluator.h" 29#include "MediaQueryList.h" 30#include "MediaQueryListListener.h" 31#include "NodeRenderStyle.h" 32#include "StyleResolver.h" 33 34namespace WebCore { 35 36MediaQueryMatcher::Listener::Listener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<MediaQueryList> query) 37 : m_listener(listener) 38 , m_query(query) 39{ 40} 41 42MediaQueryMatcher::Listener::~Listener() 43{ 44} 45 46void MediaQueryMatcher::Listener::evaluate(MediaQueryEvaluator* evaluator) 47{ 48 bool notify; 49 m_query->evaluate(evaluator, notify); 50 if (notify) 51 m_listener->queryChanged(m_query.get()); 52} 53 54MediaQueryMatcher::MediaQueryMatcher(Document* document) 55 : m_document(document) 56 , m_evaluationRound(1) 57{ 58 ASSERT(m_document); 59} 60 61MediaQueryMatcher::~MediaQueryMatcher() 62{ 63} 64 65void MediaQueryMatcher::documentDestroyed() 66{ 67 m_listeners.clear(); 68 m_document = 0; 69} 70 71String MediaQueryMatcher::mediaType() const 72{ 73 if (!m_document || !m_document->frame() || !m_document->frame()->view()) 74 return String(); 75 76 return m_document->frame()->view()->mediaType(); 77} 78 79std::unique_ptr<MediaQueryEvaluator> MediaQueryMatcher::prepareEvaluator() const 80{ 81 if (!m_document || !m_document->frame()) 82 return nullptr; 83 84 Element* documentElement = m_document->documentElement(); 85 if (!documentElement) 86 return nullptr; 87 88 RefPtr<RenderStyle> rootStyle = m_document->ensureStyleResolver().styleForElement(documentElement, m_document->renderStyle(), DisallowStyleSharing, MatchOnlyUserAgentRules); 89 90 return std::make_unique<MediaQueryEvaluator>(mediaType(), m_document->frame(), rootStyle.get()); 91} 92 93bool MediaQueryMatcher::evaluate(const MediaQuerySet* media) 94{ 95 if (!media) 96 return false; 97 98 std::unique_ptr<MediaQueryEvaluator> evaluator = prepareEvaluator(); 99 return evaluator && evaluator->eval(media); 100} 101 102PassRefPtr<MediaQueryList> MediaQueryMatcher::matchMedia(const String& query) 103{ 104 if (!m_document) 105 return 0; 106 107 RefPtr<MediaQuerySet> media = MediaQuerySet::create(query); 108#if ENABLE(RESOLUTION_MEDIA_QUERY) 109 // Add warning message to inspector whenever dpi/dpcm values are used for "screen" media. 110 reportMediaQueryWarningIfNeeded(m_document, media.get()); 111#endif 112 return MediaQueryList::create(this, media, evaluate(media.get())); 113} 114 115void MediaQueryMatcher::addListener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<MediaQueryList> query) 116{ 117 if (!m_document) 118 return; 119 120 for (size_t i = 0; i < m_listeners.size(); ++i) { 121 if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query) 122 return; 123 } 124 125 m_listeners.append(std::make_unique<Listener>(listener, query)); 126} 127 128void MediaQueryMatcher::removeListener(MediaQueryListListener* listener, MediaQueryList* query) 129{ 130 if (!m_document) 131 return; 132 133 for (size_t i = 0; i < m_listeners.size(); ++i) { 134 if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query) { 135 m_listeners.remove(i); 136 return; 137 } 138 } 139} 140 141void MediaQueryMatcher::styleResolverChanged() 142{ 143 ASSERT(m_document); 144 145 ++m_evaluationRound; 146 std::unique_ptr<MediaQueryEvaluator> evaluator = prepareEvaluator(); 147 if (!evaluator) 148 return; 149 150 for (size_t i = 0; i < m_listeners.size(); ++i) 151 m_listeners[i]->evaluate(evaluator.get()); 152} 153 154} // namespace WebCore 155