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 ChildListMutationScope_h 32 #define ChildListMutationScope_h 33 34 #include "core/dom/Document.h" 35 #include "core/dom/MutationObserver.h" 36 #include "core/dom/Node.h" 37 #include "wtf/Noncopyable.h" 38 #include "wtf/OwnPtr.h" 39 #include "wtf/RefCounted.h" 40 41 namespace WebCore { 42 43 class MutationObserverInterestGroup; 44 45 // ChildListMutationAccumulator is not meant to be used directly; ChildListMutationScope is the public interface. 46 class ChildListMutationAccumulator : public RefCounted<ChildListMutationAccumulator> { 47 public: 48 static PassRefPtr<ChildListMutationAccumulator> getOrCreate(Node&); 49 ~ChildListMutationAccumulator(); 50 51 void childAdded(PassRefPtr<Node>); 52 void willRemoveChild(PassRefPtr<Node>); 53 hasObservers()54 bool hasObservers() const { return m_observers; } 55 56 private: 57 ChildListMutationAccumulator(PassRefPtr<Node>, PassOwnPtr<MutationObserverInterestGroup>); 58 59 void enqueueMutationRecord(); 60 bool isEmpty(); 61 bool isAddedNodeInOrder(Node*); 62 bool isRemovedNodeInOrder(Node*); 63 64 RefPtr<Node> m_target; 65 66 Vector<RefPtr<Node> > m_removedNodes; 67 Vector<RefPtr<Node> > m_addedNodes; 68 RefPtr<Node> m_previousSibling; 69 RefPtr<Node> m_nextSibling; 70 Node* m_lastAdded; 71 72 OwnPtr<MutationObserverInterestGroup> m_observers; 73 }; 74 75 class ChildListMutationScope { 76 WTF_MAKE_NONCOPYABLE(ChildListMutationScope); 77 public: ChildListMutationScope(Node & target)78 explicit ChildListMutationScope(Node& target) 79 { 80 if (target.document().hasMutationObserversOfType(MutationObserver::ChildList)) 81 m_accumulator = ChildListMutationAccumulator::getOrCreate(target); 82 } 83 childAdded(Node & child)84 void childAdded(Node& child) 85 { 86 if (m_accumulator && m_accumulator->hasObservers()) 87 m_accumulator->childAdded(PassRefPtr<Node>(child)); 88 } 89 willRemoveChild(Node & child)90 void willRemoveChild(Node& child) 91 { 92 if (m_accumulator && m_accumulator->hasObservers()) 93 m_accumulator->willRemoveChild(PassRefPtr<Node>(child)); 94 } 95 96 private: 97 RefPtr<ChildListMutationAccumulator> m_accumulator; 98 }; 99 100 } // namespace WebCore 101 102 #endif // ChildListMutationScope_h 103