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 "core/css/MediaQueryMatcher.h" 22 23#include "core/css/MediaList.h" 24#include "core/css/MediaQueryEvaluator.h" 25#include "core/css/MediaQueryList.h" 26#include "core/css/MediaQueryListListener.h" 27#include "core/css/resolver/StyleResolver.h" 28#include "core/dom/Document.h" 29#include "core/frame/Frame.h" 30#include "core/frame/FrameView.h" 31 32namespace WebCore { 33 34MediaQueryMatcher::Listener::Listener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<MediaQueryList> query) 35 : m_listener(listener) 36 , m_query(query) 37{ 38} 39 40MediaQueryMatcher::Listener::~Listener() 41{ 42} 43 44void MediaQueryMatcher::Listener::evaluate(ScriptState* state, MediaQueryEvaluator* evaluator) 45{ 46 bool notify; 47 m_query->evaluate(evaluator, notify); 48 if (notify) 49 m_listener->queryChanged(state, m_query.get()); 50} 51 52MediaQueryMatcher::MediaQueryMatcher(Document* document) 53 : m_document(document) 54 , m_evaluationRound(1) 55{ 56 ASSERT(m_document); 57} 58 59MediaQueryMatcher::~MediaQueryMatcher() 60{ 61} 62 63void MediaQueryMatcher::documentDestroyed() 64{ 65 m_listeners.clear(); 66 m_document = 0; 67} 68 69AtomicString MediaQueryMatcher::mediaType() const 70{ 71 if (!m_document || !m_document->frame() || !m_document->frame()->view()) 72 return nullAtom; 73 74 return m_document->frame()->view()->mediaType(); 75} 76 77PassOwnPtr<MediaQueryEvaluator> MediaQueryMatcher::prepareEvaluator() const 78{ 79 if (!m_document || !m_document->frame()) 80 return nullptr; 81 82 Element* documentElement = m_document->documentElement(); 83 if (!documentElement) 84 return nullptr; 85 86 StyleResolver& styleResolver = m_document->ensureStyleResolver(); 87 RefPtr<RenderStyle> rootStyle = styleResolver.styleForElement(documentElement, 0 /*defaultParent*/, DisallowStyleSharing, MatchOnlyUserAgentRules); 88 89 return adoptPtr(new MediaQueryEvaluator(mediaType(), m_document->frame(), rootStyle.get())); 90} 91 92bool MediaQueryMatcher::evaluate(const MediaQuerySet* media) 93{ 94 if (!media) 95 return false; 96 97 OwnPtr<MediaQueryEvaluator> evaluator(prepareEvaluator()); 98 return evaluator && evaluator->eval(media); 99} 100 101PassRefPtr<MediaQueryList> MediaQueryMatcher::matchMedia(const String& query) 102{ 103 if (!m_document) 104 return 0; 105 106 RefPtr<MediaQuerySet> media = MediaQuerySet::create(query); 107 // Add warning message to inspector whenever dpi/dpcm values are used for "screen" media. 108 reportMediaQueryWarningIfNeeded(m_document, media.get()); 109 return MediaQueryList::create(this, media, evaluate(media.get())); 110} 111 112void MediaQueryMatcher::addListener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<MediaQueryList> query) 113{ 114 if (!m_document) 115 return; 116 117 for (size_t i = 0; i < m_listeners.size(); ++i) { 118 if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query) 119 return; 120 } 121 122 m_listeners.append(adoptPtr(new Listener(listener, query))); 123} 124 125void MediaQueryMatcher::removeListener(MediaQueryListListener* listener, MediaQueryList* query) 126{ 127 if (!m_document) 128 return; 129 130 for (size_t i = 0; i < m_listeners.size(); ++i) { 131 if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query) { 132 m_listeners.remove(i); 133 return; 134 } 135 } 136} 137 138void MediaQueryMatcher::styleResolverChanged() 139{ 140 if (!m_document) 141 return; 142 143 ScriptState* scriptState = m_document->frame() ? mainWorldScriptState(m_document->frame()) : 0; 144 if (!scriptState) 145 return; 146 147 ++m_evaluationRound; 148 OwnPtr<MediaQueryEvaluator> evaluator = prepareEvaluator(); 149 if (!evaluator) 150 return; 151 152 for (size_t i = 0; i < m_listeners.size(); ++i) 153 m_listeners[i]->evaluate(scriptState, evaluator.get()); 154} 155 156} 157