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/*
* Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* 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
* 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.
*
*/
#pragma once
#include <wtf/CheckedPtr.h>
#include <wtf/Forward.h>
#include <wtf/OptionSet.h>
#include <wtf/RefCounted.h>
#include <wtf/WeakPtr.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 WebCore {
class RenderCounter;
class RenderElement;
class CounterNode : public RefCounted<CounterNode>, public CanMakeSingleThreadWeakPtr<CounterNode> {
public:
enum class Type : uint8_t { Increment, Reset, Set };
static Ref<CounterNode> create(RenderElement&, OptionSet<Type>, int value);
~CounterNode();
bool actsAsReset() const { return hasResetType() || !m_parent; }
bool hasResetType() const { return m_type.contains(Type::Reset); }
bool hasSetType() const { return m_type.contains(Type::Set); }
int value() const { return m_value; }
int countInParent() const { return m_countInParent; }
RenderElement& owner() const;
void addRenderer(RenderCounter&);
void removeRenderer(RenderCounter&);
// Invalidates the text in the renderers of this counter, if any.
void resetRenderers();
CounterNode* parent() const { return const_cast<CounterNode*>(m_parent.get()); }
CounterNode* previousSibling() const { return const_cast<CounterNode*>(m_previousSibling.get()); }
CounterNode* nextSibling() const { return const_cast<CounterNode*>(m_nextSibling.get()); }
CounterNode* firstChild() const { return const_cast<CounterNode*>(m_firstChild.get()); }
CounterNode* lastChild() const { return const_cast<CounterNode*>(m_lastChild.get()); }
CounterNode* lastDescendant() const;
CounterNode* previousInPreOrder() const;
CounterNode* nextInPreOrder(const CounterNode* stayWithin = nullptr) const;
CounterNode* nextInPreOrderAfterChildren(const CounterNode* stayWithin = nullptr) const;
void insertAfter(CounterNode& newChild, CounterNode* beforeChild, const AtomString& identifier);
// identifier must match the identifier of this counter.
void removeChild(CounterNode&);
private:
CounterNode(RenderElement&, OptionSet<Type>, 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();
OptionSet<Type> m_type { };
int m_value;
int m_countInParent { 0 };
SingleThreadWeakRef<RenderElement> m_owner;
SingleThreadWeakPtr<RenderCounter> m_rootRenderer;
SingleThreadWeakPtr<CounterNode> m_parent;
SingleThreadWeakPtr<CounterNode> m_previousSibling;
SingleThreadWeakPtr<CounterNode> m_nextSibling;
SingleThreadWeakPtr<CounterNode> m_firstChild;
SingleThreadWeakPtr<CounterNode> m_lastChild;
};
} // namespace WebCore
#if ENABLE(TREE_DEBUGGING)
// Outside the WebCore namespace for ease of invocation from the debugger.
void showCounterTree(const WebCore::CounterNode*);
#endif
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