text: /*
   * Copyright (C) 2011 Google Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef SKY_ENGINE_CORE_DOM_MUTATIONOBSERVER_H_
  #define SKY_ENGINE_CORE_DOM_MUTATIONOBSERVER_H_
  
  #include "sky/engine/tonic/dart_wrappable.h"
  #include "sky/engine/platform/heap/Handle.h"
  #include "sky/engine/wtf/HashSet.h"
  #include "sky/engine/wtf/PassOwnPtr.h"
  #include "sky/engine/wtf/PassRefPtr.h"
  #include "sky/engine/wtf/RefCounted.h"
  #include "sky/engine/wtf/RefPtr.h"
  #include "sky/engine/wtf/Vector.h"
  
  namespace blink {
  
  class ExceptionState;
  class MutationCallback;
  class MutationObserver;
  class MutationObserverRegistration;
  class MutationRecord;
  class Node;
  
  typedef unsigned char MutationObserverOptions;
  typedef unsigned char MutationRecordDeliveryOptions;
  
  typedef HashSet<RefPtr<MutationObserver> > MutationObserverSet;
  typedef HashSet<RawPtr<MutationObserverRegistration> > MutationObserverRegistrationSet;
  typedef Vector<RefPtr<MutationObserver> > MutationObserverVector;
  typedef Vector<RefPtr<MutationRecord> > MutationRecordVector;
  
  class MutationObserver final : public RefCounted<MutationObserver> {
  public:
      enum MutationType {
          ChildList = 1 << 0,
          Attributes = 1 << 1,
          CharacterData = 1 << 2,
  
          AllMutationTypes = ChildList | Attributes | CharacterData
      };
  
      enum ObservationFlags  {
          Subtree = 1 << 3,
          AttributeFilter = 1 << 4
      };
  
      enum DeliveryFlags {
          AttributeOldValue = 1 << 5,
          CharacterDataOldValue = 1 << 6,
      };
  
      static PassRefPtr<MutationObserver> create(PassOwnPtr<MutationCallback>);
      static void resumeSuspendedObservers();
      static void deliverMutations();
  
      ~MutationObserver();
  
      void observe(Node*, ExceptionState&);
      Vector<RefPtr<MutationRecord> > takeRecords();
      void disconnect();
      void observationStarted(MutationObserverRegistration*);
      void observationEnded(MutationObserverRegistration*);
      void enqueueMutationRecord(PassRefPtr<MutationRecord>);
      void setHasTransientRegistration();
      bool canDeliver();
  
      HashSet<RawPtr<Node> > getObservedNodes() const;
  
  private:
      struct ObserverLessThan;
  
      explicit MutationObserver(PassOwnPtr<MutationCallback>);
      void deliver();
  
      OwnPtr<MutationCallback> m_callback;
      MutationRecordVector m_records;
      MutationObserverRegistrationSet m_registrations;
      unsigned m_priority;
  };
  
  } // namespace blink
  
  #endif  // SKY_ENGINE_CORE_DOM_MUTATIONOBSERVER_H_
  