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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.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * 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 ChildListMutationScope_h
#define ChildListMutationScope_h
#if ENABLE(MUTATION_OBSERVERS)
#include "Document.h"
#include "Node.h"
#include "WebKitMutationObserver.h"
#include <wtf/HashMap.h>
#include <wtf/Noncopyable.h>
#include <wtf/OwnPtr.h>
namespace WebCore {
class ChildListMutationScope {
WTF_MAKE_NONCOPYABLE(ChildListMutationScope);
public:
ChildListMutationScope(Node* target)
: m_target(target->document()->hasMutationObserversOfType(WebKitMutationObserver::ChildList) ? target : 0)
{
if (m_target)
MutationAccumulationRouter::instance()->incrementScopingLevel(m_target);
}
~ChildListMutationScope()
{
if (m_target)
MutationAccumulationRouter::instance()->decrementScopingLevel(m_target);
}
void childAdded(Node* child)
{
if (m_target)
MutationAccumulationRouter::instance()->childAdded(m_target, child);
}
void willRemoveChild(Node* child)
{
if (m_target)
MutationAccumulationRouter::instance()->willRemoveChild(m_target, child);
}
private:
class MutationAccumulator;
class MutationAccumulationRouter {
WTF_MAKE_NONCOPYABLE(MutationAccumulationRouter);
public:
~MutationAccumulationRouter();
static MutationAccumulationRouter* instance();
void incrementScopingLevel(Node*);
void decrementScopingLevel(Node*);
void childAdded(Node* target, Node* child);
void willRemoveChild(Node* target, Node* child);
private:
MutationAccumulationRouter();
static void initialize();
typedef HashMap<Node*, unsigned> ScopingLevelMap;
ScopingLevelMap m_scopingLevels;
HashMap<Node*, OwnPtr<MutationAccumulator> > m_accumulations;
static MutationAccumulationRouter* s_instance;
};
Node* m_target;
};
} // namespace WebCore
#endif // ENABLE(MUTATION_OBSERVERS)
#endif // ChildListMutationScope_h
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