1 /* 2 * Copyright (C) 2005 Allan Sandfeld Jensen (kde (at) carewolf.com) 3 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 * 20 */ 21 22 #ifndef CounterNode_h 23 #define CounterNode_h 24 25 #include "wtf/Forward.h" 26 #include "wtf/Noncopyable.h" 27 #include "wtf/RefCounted.h" 28 29 // This implements a counter tree that is used for finding parents in counters() lookup, 30 // and for propagating count changes when nodes are added or removed. 31 32 // Parents represent unique counters and their scope, which are created either explicitly 33 // by "counter-reset" style rules or implicitly by referring to a counter that is not in scope. 34 // Such nodes are tagged as "reset" nodes, although they are not all due to "counter-reset". 35 36 // Not that render tree children are often counter tree siblings due to counter scoping rules. 37 38 namespace WebCore { 39 40 class RenderObject; 41 class RenderCounter; 42 43 class CounterNode : public RefCounted<CounterNode> { 44 public: 45 static PassRefPtr<CounterNode> create(RenderObject&, bool isReset, int value); 46 ~CounterNode(); 47 bool actsAsReset() const { return m_hasResetType || !m_parent; } 48 bool hasResetType() const { return m_hasResetType; } 49 int value() const { return m_value; } 50 int countInParent() const { return m_countInParent; } 51 RenderObject& owner() const { return m_owner; } 52 void addRenderer(RenderCounter*); 53 void removeRenderer(RenderCounter*); 54 55 // Invalidates the text in the renderers of this counter, if any. 56 void resetRenderers(); 57 58 CounterNode* parent() const { return m_parent; } 59 CounterNode* previousSibling() const { return m_previousSibling; } 60 CounterNode* nextSibling() const { return m_nextSibling; } 61 CounterNode* firstChild() const { return m_firstChild; } 62 CounterNode* lastChild() const { return m_lastChild; } 63 CounterNode* lastDescendant() const; 64 CounterNode* previousInPreOrder() const; 65 CounterNode* nextInPreOrder(const CounterNode* stayWithin = 0) const; 66 CounterNode* nextInPreOrderAfterChildren(const CounterNode* stayWithin = 0) const; 67 68 void insertAfter(CounterNode* newChild, CounterNode* beforeChild, const AtomicString& identifier); 69 70 // identifier must match the identifier of this counter. 71 void removeChild(CounterNode*); 72 73 private: 74 CounterNode(RenderObject&, bool isReset, int value); 75 int computeCountInParent() const; 76 // Invalidates the text in the renderer of this counter, if any, 77 // and in the renderers of all descendants of this counter, if any. 78 void resetThisAndDescendantsRenderers(); 79 void recount(); 80 81 bool m_hasResetType; 82 int m_value; 83 int m_countInParent; 84 RenderObject& m_owner; 85 RenderCounter* m_rootRenderer; 86 87 CounterNode* m_parent; 88 CounterNode* m_previousSibling; 89 CounterNode* m_nextSibling; 90 CounterNode* m_firstChild; 91 CounterNode* m_lastChild; 92 }; 93 94 } // namespace WebCore 95 96 #ifndef NDEBUG 97 // Outside the WebCore namespace for ease of invocation from gdb. 98 void showCounterTree(const WebCore::CounterNode*); 99 #endif 100 101 #endif // CounterNode_h 102
