third_party/WebKit/Source/core/dom/IdTargetObserver.h

   1 /*
   2  * Copyright (C) 2012 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
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef IdTargetObserver_h
  27 #define IdTargetObserver_h
  28
  29 #include "platform/heap/Handle.h"
  30 #include "wtf/text/AtomicString.h"
  31
  32 namespace blink {
  33
  34 class IdTargetObserverRegistry;
  35
  36 class IdTargetObserver : public NoBaseWillBeGarbageCollectedFinalized<IdTargetObserver> {
  37 public:
  38     virtual ~IdTargetObserver();
  39     DECLARE_VIRTUAL_TRACE();
  40     virtual void idTargetChanged() = 0;
  41     virtual void unregister();
  42
  43 protected:
  44     IdTargetObserver(IdTargetObserverRegistry&, const AtomicString& id);
  45
  46 private:
  47     IdTargetObserverRegistry& registry() { return *m_registry; }
  48
  49     RawPtrWillBeMember<IdTargetObserverRegistry> m_registry;
  50     AtomicString m_id;
  51 };
  52
  53 } // namespace blink
  54
  55 #endif // IdTargetObserver_h