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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ShadowRoot_h
#define ShadowRoot_h
#include "DocumentFragment.h"
#include "ExceptionCode.h"
#include "TreeScope.h"
#include <wtf/DoublyLinkedList.h>
namespace WebCore {
class Document;
class HTMLContentElement;
class HTMLContentSelector;
class ShadowRoot : public DocumentFragment, public TreeScope, public DoublyLinkedListNode<ShadowRoot> {
friend class WTF::DoublyLinkedListNode<ShadowRoot>;
public:
static PassRefPtr<ShadowRoot> create(Element*, ExceptionCode&);
// FIXME: We will support multiple shadow subtrees, however current implementation does not work well
// if a shadow root is dynamically created. So we prohibit multiple shadow subtrees
// in several elements for a while.
// See https://bugs.webkit.org/show_bug.cgi?id=77503 and related bugs.
enum ShadowRootCreationPurpose {
CreatingUserAgentShadowRoot,
CreatingAuthorShadowRoot,
};
static PassRefPtr<ShadowRoot> create(Element*, ShadowRootCreationPurpose, ExceptionCode& = ASSERT_NO_EXCEPTION);
void recalcShadowTreeStyle(StyleChange);
void setNeedsReattachHostChildrenAndShadow();
void clearNeedsReattachHostChildrenAndShadow();
bool needsReattachHostChildrenAndShadow();
HTMLContentElement* insertionPointFor(Node*) const;
void hostChildrenChanged();
bool isSelectorActive() const;
virtual void attach();
void reattachHostChildrenAndShadow();
virtual bool applyAuthorSheets() const;
void setApplyAuthorSheets(bool);
Element* host() const { return shadowHost(); }
HTMLContentSelector* selector() const;
HTMLContentSelector* ensureSelector();
ShadowRoot* youngerShadowRoot() const { return prev(); }
ShadowRoot* olderShadowRoot() const { return next(); }
private:
ShadowRoot(Document*);
virtual ~ShadowRoot();
virtual String nodeName() const;
virtual PassRefPtr<Node> cloneNode(bool deep);
virtual bool childTypeAllowed(NodeType) const;
bool hasContentElement() const;
ShadowRoot* m_prev;
ShadowRoot* m_next;
bool m_applyAuthorSheets : 1;
bool m_needsRecalculateContent : 1;
OwnPtr<HTMLContentSelector> m_selector;
};
inline void ShadowRoot::clearNeedsReattachHostChildrenAndShadow()
{
m_needsRecalculateContent = false;
}
inline bool ShadowRoot::needsReattachHostChildrenAndShadow()
{
return m_needsRecalculateContent || hasContentElement();
}
inline ShadowRoot* toShadowRoot(Node* node)
{
ASSERT(!node || node->isShadowRoot());
return static_cast<ShadowRoot*>(node);
}
} // namespace
#endif
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