| /* |
| * 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. |
| * |
| */ |
| |
| #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 layout tree children are often counter tree siblings due to counter |
| // scoping rules. |
| |
| namespace blink { |
| |
| class LayoutObject; |
| class LayoutCounter; |
| |
| class CounterNode : public RefCounted<CounterNode> { |
| public: |
| static PassRefPtr<CounterNode> create(LayoutObject&, bool isReset, int value); |
| ~CounterNode(); |
| 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; } |
| LayoutObject& owner() const { return m_owner; } |
| void addLayoutObject(LayoutCounter*); |
| void removeLayoutObject(LayoutCounter*); |
| |
| // Invalidates the text in the layoutObjects of this counter, if any. |
| void resetLayoutObjects(); |
| |
| 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 = nullptr) const; |
| CounterNode* nextInPreOrderAfterChildren( |
| const CounterNode* stayWithin = nullptr) const; |
| |
| void insertAfter(CounterNode* newChild, |
| CounterNode* beforeChild, |
| const AtomicString& identifier); |
| |
| // identifier must match the identifier of this counter. |
| void removeChild(CounterNode*); |
| |
| private: |
| CounterNode(LayoutObject&, bool isReset, int value); |
| int computeCountInParent() const; |
| // Invalidates the text in the layoutObject of this counter, if any, |
| // and in the layoutObjects of all descendants of this counter, if any. |
| void resetThisAndDescendantsLayoutObjects(); |
| void recount(); |
| |
| bool m_hasResetType; |
| int m_value; |
| int m_countInParent; |
| LayoutObject& m_owner; |
| LayoutCounter* m_rootLayoutObject; |
| |
| 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 |
| |
| #endif // CounterNode_h |