1/* 2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org) 3 * (C) 1999 Antti Koivisto (koivisto@kde.org) 4 * (C) 2001 Dirk Mueller (mueller@kde.org) 5 * Copyright (C) 2003, 2010 Apple Inc. All rights reserved. 6 * (C) 2007 Rob Buis (buis@kde.org) 7 * 8 * This library is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Library General Public 10 * License as published by the Free Software Foundation; either 11 * version 2 of the License, or (at your option) any later version. 12 * 13 * This library is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Library General Public License for more details. 17 * 18 * You should have received a copy of the GNU Library General Public License 19 * along with this library; see the file COPYING.LIB. If not, write to 20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 21 * Boston, MA 02110-1301, USA. 22 */ 23 24#include "config.h" 25#include "core/html/HTMLStyleElement.h" 26 27#include "HTMLNames.h" 28#include "core/css/MediaList.h" 29#include "core/css/StyleSheetContents.h" 30#include "core/dom/ContextFeatures.h" 31#include "core/dom/Document.h" 32#include "core/events/Event.h" 33#include "core/events/EventSender.h" 34#include "core/dom/StyleEngine.h" 35#include "core/dom/shadow/ShadowRoot.h" 36 37namespace WebCore { 38 39using namespace HTMLNames; 40 41static StyleEventSender& styleLoadEventSender() 42{ 43 DEFINE_STATIC_LOCAL(StyleEventSender, sharedLoadEventSender, (EventTypeNames::load)); 44 return sharedLoadEventSender; 45} 46 47inline HTMLStyleElement::HTMLStyleElement(Document& document, bool createdByParser) 48 : HTMLElement(styleTag, document) 49 , StyleElement(&document, createdByParser) 50 , m_firedLoad(false) 51 , m_loadedSheet(false) 52 , m_scopedStyleRegistrationState(NotRegistered) 53{ 54 ScriptWrappable::init(this); 55} 56 57HTMLStyleElement::~HTMLStyleElement() 58{ 59 // During tear-down, willRemove isn't called, so m_scopedStyleRegistrationState may still be RegisteredAsScoped or RegisteredInShadowRoot here. 60 // Therefore we can't ASSERT(m_scopedStyleRegistrationState == NotRegistered). 61 StyleElement::clearDocumentData(document(), this); 62 63 styleLoadEventSender().cancelEvent(this); 64} 65 66PassRefPtr<HTMLStyleElement> HTMLStyleElement::create(Document& document, bool createdByParser) 67{ 68 return adoptRef(new HTMLStyleElement(document, createdByParser)); 69} 70 71void HTMLStyleElement::parseAttribute(const QualifiedName& name, const AtomicString& value) 72{ 73 if (name == titleAttr && m_sheet) { 74 m_sheet->setTitle(value); 75 } else if (name == scopedAttr && ContextFeatures::styleScopedEnabled(&document())) { 76 scopedAttributeChanged(!value.isNull()); 77 } else if (name == mediaAttr && inDocument() && document().isActive() && m_sheet) { 78 m_sheet->setMediaQueries(MediaQuerySet::create(value)); 79 // FIXME: This shold be RecalcStyleDeferred. 80 document().modifiedStyleSheet(m_sheet.get(), RecalcStyleImmediately); 81 } else { 82 HTMLElement::parseAttribute(name, value); 83 } 84} 85 86void HTMLStyleElement::scopedAttributeChanged(bool scoped) 87{ 88 ASSERT(ContextFeatures::styleScopedEnabled(&document())); 89 90 if (!inDocument()) 91 return; 92 93 if (scoped) { 94 if (m_scopedStyleRegistrationState == RegisteredAsScoped) 95 return; 96 97 // As any <style> in a shadow tree is treated as "scoped", 98 // need to remove the <style> from its shadow root. 99 ContainerNode* scopingNode = 0; 100 if (m_scopedStyleRegistrationState == RegisteredInShadowRoot) { 101 scopingNode = containingShadowRoot(); 102 unregisterWithScopingNode(scopingNode); 103 } 104 document().styleEngine()->removeStyleSheetCandidateNode(this, scopingNode); 105 registerWithScopingNode(true); 106 107 document().styleEngine()->addStyleSheetCandidateNode(this, false); 108 document().modifiedStyleSheet(sheet()); 109 return; 110 } 111 112 // If the <style> was scoped, need to remove the <style> from the scoping 113 // element, i.e. the parent node. 114 if (m_scopedStyleRegistrationState != RegisteredAsScoped) 115 return; 116 117 unregisterWithScopingNode(parentNode()); 118 document().styleEngine()->removeStyleSheetCandidateNode(this, parentNode()); 119 120 // As any <style> in a shadow tree is treated as "scoped", 121 // need to add the <style> to its shadow root. 122 if (isInShadowTree()) 123 registerWithScopingNode(false); 124 125 document().styleEngine()->addStyleSheetCandidateNode(this, false); 126 // FIXME: currently need to use FullStyleUpdate here. 127 // Because ShadowTreeStyleSheetCollection doesn't know old scoping node. 128 // So setNeedsStyleRecalc for old scoping node is not invoked. 129 document().modifiedStyleSheet(sheet()); 130} 131 132void HTMLStyleElement::finishParsingChildren() 133{ 134 StyleElement::finishParsingChildren(this); 135 HTMLElement::finishParsingChildren(); 136} 137 138void HTMLStyleElement::registerWithScopingNode(bool scoped) 139{ 140 // Note: We cannot rely on the 'scoped' element already being present when this method is invoked. 141 // Therefore we cannot rely on scoped()! 142 ASSERT(m_scopedStyleRegistrationState == NotRegistered); 143 ASSERT(inDocument()); 144 if (m_scopedStyleRegistrationState != NotRegistered) 145 return; 146 147 ContainerNode* scope = scoped ? parentNode() : containingShadowRoot(); 148 if (!scope) 149 return; 150 if (!scope->isElementNode() && !scope->isShadowRoot()) { 151 // DocumentFragment nodes should never be inDocument, 152 // <style> should not be a child of Document, PI or some such. 153 ASSERT_NOT_REACHED(); 154 return; 155 } 156 scope->registerScopedHTMLStyleChild(); 157 m_scopedStyleRegistrationState = scoped ? RegisteredAsScoped : RegisteredInShadowRoot; 158} 159 160void HTMLStyleElement::unregisterWithScopingNode(ContainerNode* scope) 161{ 162 ASSERT(m_scopedStyleRegistrationState != NotRegistered || !ContextFeatures::styleScopedEnabled(&document())); 163 if (!isRegisteredAsScoped()) 164 return; 165 166 ASSERT(scope); 167 if (scope) { 168 ASSERT(scope->hasScopedHTMLStyleChild()); 169 scope->unregisterScopedHTMLStyleChild(); 170 } 171 172 m_scopedStyleRegistrationState = NotRegistered; 173} 174 175Node::InsertionNotificationRequest HTMLStyleElement::insertedInto(ContainerNode* insertionPoint) 176{ 177 HTMLElement::insertedInto(insertionPoint); 178 if (insertionPoint->inDocument()) { 179 if (m_scopedStyleRegistrationState == NotRegistered && (scoped() || isInShadowTree())) 180 registerWithScopingNode(scoped()); 181 } 182 return InsertionShouldCallDidNotifySubtreeInsertions; 183} 184 185void HTMLStyleElement::removedFrom(ContainerNode* insertionPoint) 186{ 187 HTMLElement::removedFrom(insertionPoint); 188 189 // In the current implementation, <style scoped> is only registered if the node is in the document. 190 // That is, because willRemove() is also called if an ancestor is removed from the document. 191 // Now, if we want to register <style scoped> even if it's not inDocument, 192 // we'd need to find a way to discern whether that is the case, or whether <style scoped> itself is about to be removed. 193 ContainerNode* scope = 0; 194 if (m_scopedStyleRegistrationState != NotRegistered) { 195 if (m_scopedStyleRegistrationState == RegisteredInShadowRoot) { 196 scope = containingShadowRoot(); 197 if (!scope) 198 scope = insertionPoint->containingShadowRoot(); 199 } else 200 scope = parentNode() ? parentNode() : insertionPoint; 201 unregisterWithScopingNode(scope); 202 } 203 204 if (insertionPoint->inDocument()) 205 StyleElement::removedFromDocument(document(), this, scope); 206} 207 208void HTMLStyleElement::didNotifySubtreeInsertionsToDocument() 209{ 210 StyleElement::processStyleSheet(document(), this); 211} 212 213void HTMLStyleElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta) 214{ 215 HTMLElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta); 216 StyleElement::childrenChanged(this); 217} 218 219const AtomicString& HTMLStyleElement::media() const 220{ 221 return getAttribute(mediaAttr); 222} 223 224const AtomicString& HTMLStyleElement::type() const 225{ 226 return getAttribute(typeAttr); 227} 228 229bool HTMLStyleElement::scoped() const 230{ 231 return fastHasAttribute(scopedAttr) && ContextFeatures::styleScopedEnabled(&document()); 232} 233 234void HTMLStyleElement::setScoped(bool scopedValue) 235{ 236 setBooleanAttribute(scopedAttr, scopedValue); 237} 238 239ContainerNode* HTMLStyleElement::scopingNode() 240{ 241 if (!inDocument()) 242 return 0; 243 244 if (!isRegisteredAsScoped()) 245 return &document(); 246 247 if (isRegisteredInShadowRoot()) 248 return containingShadowRoot(); 249 250 return parentNode(); 251} 252 253void HTMLStyleElement::dispatchPendingLoadEvents() 254{ 255 styleLoadEventSender().dispatchPendingEvents(); 256} 257 258void HTMLStyleElement::dispatchPendingEvent(StyleEventSender* eventSender) 259{ 260 ASSERT_UNUSED(eventSender, eventSender == &styleLoadEventSender()); 261 dispatchEvent(Event::create(m_loadedSheet ? EventTypeNames::load : EventTypeNames::error)); 262} 263 264void HTMLStyleElement::notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred) 265{ 266 if (m_firedLoad) 267 return; 268 m_loadedSheet = !errorOccurred; 269 styleLoadEventSender().dispatchEventSoon(this); 270 m_firedLoad = true; 271} 272 273void HTMLStyleElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const 274{ 275 HTMLElement::addSubresourceAttributeURLs(urls); 276 277 if (CSSStyleSheet* styleSheet = const_cast<HTMLStyleElement*>(this)->sheet()) 278 styleSheet->contents()->addSubresourceStyleURLs(urls); 279} 280 281bool HTMLStyleElement::disabled() const 282{ 283 if (!m_sheet) 284 return false; 285 286 return m_sheet->disabled(); 287} 288 289void HTMLStyleElement::setDisabled(bool setDisabled) 290{ 291 if (CSSStyleSheet* styleSheet = sheet()) 292 styleSheet->setDisabled(setDisabled); 293} 294 295} 296