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 "CSSStyleSelector.h" 24#include "Document.h" 25#include "Element.h" 26#include "FrameView.h" 27#include "MediaList.h" 28#include "MediaQueryEvaluator.h" 29#include "MediaQueryList.h" 30#include "MediaQueryListListener.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 69String MediaQueryMatcher::mediaType() const 70{ 71 if (!m_document || !m_document->frame() || !m_document->frame()->view()) 72 return String(); 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 0; 81 82 Element* documentElement = m_document->documentElement(); 83 if (!documentElement) 84 return 0; 85 86 CSSStyleSelector* styleSelector = m_document->styleSelector(); 87 if (!styleSelector) 88 return 0; 89 90 RefPtr<RenderStyle> rootStyle = styleSelector->styleForElement(documentElement, 0 /*defaultParent*/, false /*allowSharing*/, true /*resolveForRootDefault*/); 91 92 return adoptPtr(new MediaQueryEvaluator(mediaType(), m_document->frame(), rootStyle.get())); 93} 94 95bool MediaQueryMatcher::evaluate(MediaList* media) 96{ 97 if (!media) 98 return false; 99 100 OwnPtr<MediaQueryEvaluator> evaluator(prepareEvaluator()); 101 return evaluator && evaluator->eval(media); 102} 103 104PassRefPtr<MediaQueryList> MediaQueryMatcher::matchMedia(const String& query) 105{ 106 if (!m_document) 107 return 0; 108 109 RefPtr<MediaList> media = MediaList::create(query, false); 110 return MediaQueryList::create(this, media, evaluate(media.get())); 111} 112 113void MediaQueryMatcher::addListener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<MediaQueryList> query) 114{ 115 if (!m_document) 116 return; 117 118 for (size_t i = 0; i < m_listeners.size(); ++i) { 119 if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query) 120 return; 121 } 122 123 m_listeners.append(new Listener(listener, query)); 124} 125 126void MediaQueryMatcher::removeListener(MediaQueryListListener* listener, MediaQueryList* query) 127{ 128 if (!m_document) 129 return; 130 131 for (size_t i = 0; i < m_listeners.size(); ++i) { 132 if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query) { 133 m_listeners.remove(i); 134 return; 135 } 136 } 137} 138 139void MediaQueryMatcher::styleSelectorChanged() 140{ 141 ASSERT(m_document); 142 143 ScriptState* scriptState = mainWorldScriptState(m_document->frame()); 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