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 MutationObserver_h 32 #define MutationObserver_h 33 34 #include "bindings/v8/ScriptWrappable.h" 35 #include "wtf/HashSet.h" 36 #include "wtf/PassRefPtr.h" 37 #include "wtf/RefCounted.h" 38 #include "wtf/RefPtr.h" 39 #include "wtf/Vector.h" 40 41 namespace WebCore { 42 43 class Dictionary; 44 class ExceptionState; 45 class MutationCallback; 46 class MutationObserverRegistration; 47 class MutationRecord; 48 class Node; 49 50 typedef unsigned char MutationObserverOptions; 51 typedef unsigned char MutationRecordDeliveryOptions; 52 53 class MutationObserver : public RefCounted<MutationObserver>, public ScriptWrappable { 54 public: 55 enum MutationType { 56 ChildList = 1 << 0, 57 Attributes = 1 << 1, 58 CharacterData = 1 << 2, 59 60 AllMutationTypes = ChildList | Attributes | CharacterData 61 }; 62 63 enum ObservationFlags { 64 Subtree = 1 << 3, 65 AttributeFilter = 1 << 4 66 }; 67 68 enum DeliveryFlags { 69 AttributeOldValue = 1 << 5, 70 CharacterDataOldValue = 1 << 6, 71 }; 72 73 static PassRefPtr<MutationObserver> create(PassOwnPtr<MutationCallback>); 74 static void deliverAllMutations(); 75 76 ~MutationObserver(); 77 78 void observe(Node*, const Dictionary&, ExceptionState&); 79 Vector<RefPtr<MutationRecord> > takeRecords(); 80 void disconnect(); 81 void observationStarted(MutationObserverRegistration*); 82 void observationEnded(MutationObserverRegistration*); 83 void enqueueMutationRecord(PassRefPtr<MutationRecord>); 84 void setHasTransientRegistration(); 85 bool canDeliver(); 86 87 HashSet<Node*> getObservedNodes() const; 88 89 private: 90 struct ObserverLessThan; 91 92 explicit MutationObserver(PassOwnPtr<MutationCallback>); 93 void deliver(); 94 95 OwnPtr<MutationCallback> m_callback; 96 Vector<RefPtr<MutationRecord> > m_records; 97 HashSet<MutationObserverRegistration*> m_registrations; 98 unsigned m_priority; 99 }; 100 101 } 102 103 #endif // MutationObserver_h 104