1/* 2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org) 3 * (C) 1999 Antti Koivisto (koivisto@kde.org) 4 * Copyright (C) 2003, 2008, 2010 Apple Inc. All rights reserved. 5 * Copyright (C) 2011 Google Inc. All rights reserved. 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Library General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Library General Public License for more details. 16 * 17 * You should have received a copy of the GNU Library General Public License 18 * along with this library; see the file COPYING.LIB. If not, write to 19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 20 * Boston, MA 02110-1301, USA. 21 * 22 */ 23 24#ifndef HTMLLinkElement_h 25#define HTMLLinkElement_h 26 27#include "CSSStyleSheet.h" 28#include "CachedStyleSheetClient.h" 29#include "CachedResourceHandle.h" 30#include "DOMSettableTokenList.h" 31#include "HTMLElement.h" 32#include "IconURL.h" 33#include "LinkLoader.h" 34#include "LinkLoaderClient.h" 35#include "LinkRelAttribute.h" 36#include "Timer.h" 37 38namespace WebCore { 39 40class HTMLLinkElement; 41class KURL; 42 43template<typename T> class EventSender; 44typedef EventSender<HTMLLinkElement> LinkEventSender; 45 46class HTMLLinkElement FINAL : public HTMLElement, public CachedStyleSheetClient, public LinkLoaderClient { 47public: 48 static PassRefPtr<HTMLLinkElement> create(const QualifiedName&, Document*, bool createdByParser); 49 virtual ~HTMLLinkElement(); 50 51 KURL href() const; 52 String rel() const; 53 54 virtual String target() const; 55 56 String type() const; 57 58 IconType iconType() const; 59 60 // the icon size string as parsed from the HTML attribute 61 String iconSizes() const; 62 63 CSSStyleSheet* sheet() const { return m_sheet.get(); } 64 65 bool styleSheetIsLoading() const; 66 67 bool isDisabled() const { return m_disabledState == Disabled; } 68 bool isEnabledViaScript() const { return m_disabledState == EnabledViaScript; } 69 void setSizes(const String&); 70 DOMSettableTokenList* sizes() const; 71 72 void dispatchPendingEvent(LinkEventSender*); 73 static void dispatchPendingLoadEvents(); 74 75private: 76 virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE; 77 78 virtual bool shouldLoadLink(); 79 void process(); 80 static void processCallback(Node*); 81 void clearSheet(); 82 83 virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE; 84 virtual void removedFrom(ContainerNode*) OVERRIDE; 85 86 // from CachedResourceClient 87 virtual void setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CachedCSSStyleSheet* sheet); 88 virtual bool sheetLoaded(); 89 virtual void notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred); 90 virtual void startLoadingDynamicSheet(); 91 92 virtual void linkLoaded() OVERRIDE; 93 virtual void linkLoadingErrored() OVERRIDE; 94 95 bool isAlternate() const { return m_disabledState == Unset && m_relAttribute.m_isAlternate; } 96 97 void setDisabledState(bool); 98 99 virtual bool isURLAttribute(const Attribute&) const OVERRIDE; 100 101private: 102 virtual void addSubresourceAttributeURLs(ListHashSet<KURL>&) const; 103 104 virtual void finishParsingChildren(); 105 106 enum PendingSheetType { Unknown, ActiveSheet, InactiveSheet }; 107 void addPendingSheet(PendingSheetType); 108 109 enum RemovePendingSheetNotificationType { 110 RemovePendingSheetNotifyImmediately, 111 RemovePendingSheetNotifyLater 112 }; 113 114 void removePendingSheet(RemovePendingSheetNotificationType = RemovePendingSheetNotifyImmediately); 115 116#if ENABLE(MICRODATA) 117 virtual String itemValueText() const OVERRIDE; 118 virtual void setItemValueText(const String&, ExceptionCode&) OVERRIDE; 119#endif 120 121private: 122 HTMLLinkElement(const QualifiedName&, Document*, bool createdByParser); 123 124 LinkLoader m_linkLoader; 125 CachedResourceHandle<CachedCSSStyleSheet> m_cachedSheet; 126 RefPtr<CSSStyleSheet> m_sheet; 127 enum DisabledState { 128 Unset, 129 EnabledViaScript, 130 Disabled 131 }; 132 133 String m_type; 134 String m_media; 135 RefPtr<DOMSettableTokenList> m_sizes; 136 DisabledState m_disabledState; 137 LinkRelAttribute m_relAttribute; 138 bool m_loading; 139 bool m_createdByParser; 140 bool m_isInShadowTree; 141 bool m_firedLoad; 142 bool m_loadedSheet; 143 144 PendingSheetType m_pendingSheetType; 145}; 146 147} //namespace 148 149#endif 150