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* Copyright (C) 2005 Allan Sandfeld Jensen (
* Copyright (C) 2006, 2007 Apple 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
* 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 CounterNode_h
#define CounterNode_h
#include "wtf/Forward.h"
#include "wtf/Noncopyable.h"
#include "wtf/RefCounted.h"
// This implements a counter tree that is used for finding parents in counters() lookup,
// and for propagating count changes when nodes are added or removed.
// Parents represent unique counters and their scope, which are created either explicitly
// by "counter-reset" style rules or implicitly by referring to a counter that is not in scope.
// Such nodes are tagged as "reset" nodes, although they are not all due to "counter-reset".
// Not that render tree children are often counter tree siblings due to counter scoping rules.
namespace blink {
class RenderObject;
class RenderCounter;
class CounterNode : public RefCounted<CounterNode> {
static PassRefPtr<CounterNode> create(RenderObject&, bool isReset, int value);
bool actsAsReset() const { return m_hasResetType || !m_parent; }
bool hasResetType() const { return m_hasResetType; }
int value() const { return m_value; }
int countInParent() const { return m_countInParent; }
RenderObject& owner() const { return m_owner; }
void addRenderer(RenderCounter*);
void removeRenderer(RenderCounter*);
// Invalidates the text in the renderers of this counter, if any.
void resetRenderers();
CounterNode* parent() const { return m_parent; }
CounterNode* previousSibling() const { return m_previousSibling; }
CounterNode* nextSibling() const { return m_nextSibling; }
CounterNode* firstChild() const { return m_firstChild; }
CounterNode* lastChild() const { return m_lastChild; }
CounterNode* lastDescendant() const;
CounterNode* previousInPreOrder() const;
CounterNode* nextInPreOrder(const CounterNode* stayWithin = 0) const;
CounterNode* nextInPreOrderAfterChildren(const CounterNode* stayWithin = 0) const;
void insertAfter(CounterNode* newChild, CounterNode* beforeChild, const AtomicString& identifier);
// identifier must match the identifier of this counter.
void removeChild(CounterNode*);
CounterNode(RenderObject&, bool isReset, int value);
int computeCountInParent() const;
// Invalidates the text in the renderer of this counter, if any,
// and in the renderers of all descendants of this counter, if any.
void resetThisAndDescendantsRenderers();
void recount();
bool m_hasResetType;
int m_value;
int m_countInParent;
RenderObject& m_owner;
RenderCounter* m_rootRenderer;
CounterNode* m_parent;
CounterNode* m_previousSibling;
CounterNode* m_nextSibling;
CounterNode* m_firstChild;
CounterNode* m_lastChild;
} // namespace blink
#ifndef NDEBUG
// Outside the WebCore namespace for ease of invocation from gdb.
void showCounterTree(const blink::CounterNode*);
#endif // CounterNode_h