97 lines
3.7 KiB
C++
97 lines
3.7 KiB
C++
/*
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* Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
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* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#pragma once
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#include <wtf/Forward.h>
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#include <wtf/RefCounted.h>
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// This implements a counter tree that is used for finding parents in counters() lookup,
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// and for propagating count changes when nodes are added or removed.
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// Parents represent unique counters and their scope, which are created either explicitly
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// by "counter-reset" style rules or implicitly by referring to a counter that is not in scope.
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// Such nodes are tagged as "reset" nodes, although they are not all due to "counter-reset".
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// Not that render tree children are often counter tree siblings due to counter scoping rules.
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namespace WebCore {
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class RenderCounter;
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class RenderElement;
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class CounterNode : public RefCounted<CounterNode> {
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public:
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static Ref<CounterNode> create(RenderElement&, bool isReset, int value);
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~CounterNode();
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bool actsAsReset() const { return m_hasResetType || !m_parent; }
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bool hasResetType() const { return m_hasResetType; }
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int value() const { return m_value; }
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int countInParent() const { return m_countInParent; }
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RenderElement& owner() const { return m_owner; }
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void addRenderer(RenderCounter&);
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void removeRenderer(RenderCounter&);
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// Invalidates the text in the renderers of this counter, if any.
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void resetRenderers();
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CounterNode* parent() const { return m_parent; }
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CounterNode* previousSibling() const { return m_previousSibling; }
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CounterNode* nextSibling() const { return m_nextSibling; }
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CounterNode* firstChild() const { return m_firstChild; }
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CounterNode* lastChild() const { return m_lastChild; }
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CounterNode* lastDescendant() const;
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CounterNode* previousInPreOrder() const;
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CounterNode* nextInPreOrder(const CounterNode* stayWithin = nullptr) const;
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CounterNode* nextInPreOrderAfterChildren(const CounterNode* stayWithin = nullptr) const;
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void insertAfter(CounterNode& newChild, CounterNode* beforeChild, const AtomString& identifier);
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// identifier must match the identifier of this counter.
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void removeChild(CounterNode&);
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private:
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CounterNode(RenderElement&, bool isReset, int value);
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int computeCountInParent() const;
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// Invalidates the text in the renderer of this counter, if any,
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// and in the renderers of all descendants of this counter, if any.
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void resetThisAndDescendantsRenderers();
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void recount();
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bool m_hasResetType;
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int m_value;
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int m_countInParent;
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RenderElement& m_owner;
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RenderCounter* m_rootRenderer { nullptr };
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CounterNode* m_parent { nullptr };
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CounterNode* m_previousSibling { nullptr };
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CounterNode* m_nextSibling { nullptr };
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CounterNode* m_firstChild { nullptr };
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CounterNode* m_lastChild { nullptr };
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};
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} // namespace WebCore
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#if ENABLE(TREE_DEBUGGING)
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// Outside the WebCore namespace for ease of invocation from the debugger.
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void showCounterTree(const WebCore::CounterNode*);
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#endif
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