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 MutationObserverRegistration_h 32 #define MutationObserverRegistration_h 33 34 #include "core/dom/MutationObserver.h" 35 #include "wtf/HashSet.h" 36 #include "wtf/text/AtomicString.h" 37 #include "wtf/text/AtomicStringHash.h" 38 39 namespace WebCore { 40 41 class QualifiedName; 42 43 class MutationObserverRegistration { 44 public: 45 static PassOwnPtr<MutationObserverRegistration> create(PassRefPtr<MutationObserver>, Node*, MutationObserverOptions, const HashSet<AtomicString>& attributeFilter); 46 ~MutationObserverRegistration(); 47 48 void resetObservation(MutationObserverOptions, const HashSet<AtomicString>& attributeFilter); 49 void observedSubtreeNodeWillDetach(Node*); 50 void clearTransientRegistrations(); 51 bool hasTransientRegistrations() const { return m_transientRegistrationNodes && !m_transientRegistrationNodes->isEmpty(); } 52 void unregister(); 53 54 bool shouldReceiveMutationFrom(Node*, MutationObserver::MutationType, const QualifiedName* attributeName) const; 55 bool isSubtree() const { return m_options & MutationObserver::Subtree; } 56 57 MutationObserver* observer() const { return m_observer.get(); } 58 MutationRecordDeliveryOptions deliveryOptions() const { return m_options & (MutationObserver::AttributeOldValue | MutationObserver::CharacterDataOldValue); } 59 MutationObserverOptions mutationTypes() const { return m_options & MutationObserver::AllMutationTypes; } 60 61 void addRegistrationNodesToSet(HashSet<Node*>&) const; 62 63 private: 64 MutationObserverRegistration(PassRefPtr<MutationObserver>, Node*, MutationObserverOptions, const HashSet<AtomicString>& attributeFilter); 65 66 RefPtr<MutationObserver> m_observer; 67 Node* m_registrationNode; 68 RefPtr<Node> m_registrationNodeKeepAlive; 69 typedef HashSet<RefPtr<Node> > NodeHashSet; 70 OwnPtr<NodeHashSet> m_transientRegistrationNodes; 71 72 MutationObserverOptions m_options; 73 HashSet<AtomicString> m_attributeFilter; 74 }; 75 76 } // namespace WebCore 77 78 #endif // MutationObserverRegistration_h 79
