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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2003, 2008, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef HTMLLinkElement_h
#define HTMLLinkElement_h
#include "core/css/CSSStyleSheet.h"
#include "core/dom/IconURL.h"
#include "core/html/DOMSettableTokenList.h"
#include "core/html/HTMLElement.h"
#include "core/html/LinkRelAttribute.h"
#include "core/html/LinkResource.h"
#include "core/loader/LinkLoader.h"
#include "core/loader/LinkLoaderClient.h"
#include "core/loader/cache/ResourcePtr.h"
#include "core/loader/cache/StyleSheetResourceClient.h"
namespace WebCore {
class DocumentFragment;
class HTMLLinkElement;
class KURL;
class LinkImport;
template<typename T> class EventSender;
typedef EventSender<HTMLLinkElement> LinkEventSender;
//
// LinkStyle handles dynaically change-able link resources, which is
// typically @rel="stylesheet".
//
// It could be @rel="shortcut icon" or soething else though. Each of
// types might better be handled by a separate class, but dynamically
// changing @rel makes it harder to move such a design so we are
// sticking current way so far.
//
class LinkStyle FINAL : public LinkResource, StyleSheetResourceClient {
WTF_MAKE_FAST_ALLOCATED;
public:
static PassRefPtr<LinkStyle> create(HTMLLinkElement* owner);
explicit LinkStyle(HTMLLinkElement* owner);
virtual ~LinkStyle();
virtual Type type() const OVERRIDE { return Style; }
virtual void process() OVERRIDE;
virtual void ownerRemoved() OVERRIDE;
virtual bool hasLoaded() const OVERRIDE { return m_loadedSheet; }
void startLoadingDynamicSheet();
void notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred);
bool sheetLoaded();
void setDisabledState(bool);
void setSheetTitle(const String&);
bool styleSheetIsLoading() const;
bool hasSheet() const { return m_sheet; }
bool isDisabled() const { return m_disabledState == Disabled; }
bool isEnabledViaScript() const { return m_disabledState == EnabledViaScript; }
bool isUnset() const { return m_disabledState == Unset; }
CSSStyleSheet* sheet() const { return m_sheet.get(); }
private:
// From ResourceClient
virtual void setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource*);
enum DisabledState {
Unset,
EnabledViaScript,
Disabled
};
enum PendingSheetType {
None,
NonBlocking,
Blocking
};
enum RemovePendingSheetNotificationType {
RemovePendingSheetNotifyImmediately,
RemovePendingSheetNotifyLater
};
void clearSheet();
void addPendingSheet(PendingSheetType);
void removePendingSheet(RemovePendingSheetNotificationType = RemovePendingSheetNotifyImmediately);
Document* document();
ResourcePtr<CSSStyleSheetResource> m_resource;
RefPtr<CSSStyleSheet> m_sheet;
DisabledState m_disabledState;
PendingSheetType m_pendingSheetType;
bool m_loading;
bool m_firedLoad;
bool m_loadedSheet;
};
class HTMLLinkElement FINAL : public HTMLElement, public LinkLoaderClient {
public:
static PassRefPtr<HTMLLinkElement> create(const QualifiedName&, Document*, bool createdByParser);
virtual ~HTMLLinkElement();
KURL href() const;
String rel() const;
String media() const { return m_media; }
String typeValue() const { return m_type; }
const LinkRelAttribute& relAttribute() const { return m_relAttribute; }
virtual String target() const;
String type() const;
IconType iconType() const;
// the icon size string as parsed from the HTML attribute
String iconSizes() const;
CSSStyleSheet* sheet() const { return linkStyle() ? linkStyle()->sheet() : 0; }
Document* import() const;
bool styleSheetIsLoading() const;
bool isDisabled() const { return linkStyle() && linkStyle()->isDisabled(); }
bool isEnabledViaScript() const { return linkStyle() && linkStyle()->isEnabledViaScript(); }
void setSizes(const String&);
DOMSettableTokenList* sizes() const;
void dispatchPendingEvent(LinkEventSender*);
void scheduleEvent();
static void dispatchPendingLoadEvents();
// From LinkLoaderClient
virtual bool shouldLoadLink() OVERRIDE;
// For LinkStyle
bool loadLink(const String& type, const KURL& url) { return m_linkLoader.loadLink(m_relAttribute, type, url, document()); }
bool isAlternate() const { return linkStyle()->isUnset() && m_relAttribute.isAlternate(); }
bool shouldProcessStyle() { return linkResourceToProcess() && linkStyle(); }
private:
virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
LinkStyle* linkStyle() const;
LinkImport* linkImport() const;
LinkResource* linkResourceToProcess();
void process();
static void processCallback(Node*);
// From Node and subclassses
virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
virtual void removedFrom(ContainerNode*) OVERRIDE;
virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
virtual bool sheetLoaded() OVERRIDE;
virtual void notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred) OVERRIDE;
virtual void startLoadingDynamicSheet() OVERRIDE;
virtual void addSubresourceAttributeURLs(ListHashSet<KURL>&) const OVERRIDE;
virtual void finishParsingChildren();
// From LinkLoaderClient
virtual void linkLoaded() OVERRIDE;
virtual void linkLoadingErrored() OVERRIDE;
virtual void didStartLinkPrerender() OVERRIDE;
virtual void didStopLinkPrerender() OVERRIDE;
virtual void didSendLoadForLinkPrerender() OVERRIDE;
virtual void didSendDOMContentLoadedForLinkPrerender() OVERRIDE;
private:
HTMLLinkElement(const QualifiedName&, Document*, bool createdByParser);
RefPtr<LinkResource> m_link;
LinkLoader m_linkLoader;
String m_type;
String m_media;
RefPtr<DOMSettableTokenList> m_sizes;
LinkRelAttribute m_relAttribute;
bool m_createdByParser;
bool m_isInShadowTree;
int m_beforeLoadRecurseCount;
};
inline HTMLLinkElement* toHTMLLinkElement(Node* node)
{
ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(HTMLNames::linkTag));
return static_cast<HTMLLinkElement*>(node);
}
} //namespace
#endif
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