1 /* 2 * Copyright (C) 2011 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef OrderIterator_h 32 #define OrderIterator_h 33 34 #include "wtf/Noncopyable.h" 35 #include "wtf/Vector.h" 36 37 #include <set> 38 39 namespace WebCore { 40 41 class RenderBox; 42 43 class OrderIterator { 44 WTF_MAKE_NONCOPYABLE(OrderIterator); 45 public: 46 friend class OrderIteratorPopulator; 47 48 OrderIterator(const RenderBox*); 49 currentChild()50 RenderBox* currentChild() const { return m_currentChild; } 51 RenderBox* first(); 52 RenderBox* next(); 53 void reset(); 54 55 private: 56 RenderBox* firstChildBox(); 57 RenderBox* nextSiblingBox(); 58 59 // If |m_children| is not empty, we will use it to iterate over this fixed subset. 60 const RenderBox* m_containerBox; 61 Vector<RenderBox*> m_children; 62 63 RenderBox* m_currentChild; 64 size_t m_childIndex; 65 66 typedef std::set<int> OrderValues; 67 OrderValues m_orderValues; 68 OrderValues::const_iterator m_orderValuesIterator; 69 bool m_isReset; 70 }; 71 72 class OrderIteratorPopulator { 73 public: OrderIteratorPopulator(OrderIterator & iterator)74 explicit OrderIteratorPopulator(OrderIterator& iterator) 75 : m_iterator(iterator) 76 { 77 m_iterator.m_orderValues.clear(); 78 } 79 80 ~OrderIteratorPopulator(); 81 82 void storeChild(RenderBox*); 83 void collectChild(const RenderBox*); 84 85 private: 86 OrderIterator& m_iterator; 87 }; 88 89 } // namespace WebCore 90 91 #endif // OrderIterator_h 92