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 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 GOOGLE 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 FrameDestructionObserver_h 27 #define FrameDestructionObserver_h 28 29 #include "platform/heap/Handle.h" 30 31 namespace blink { 32 33 class LocalFrame; 34 35 class FrameDestructionObserver : public WillBeGarbageCollectedMixin { 36 public: 37 explicit FrameDestructionObserver(LocalFrame*); 38 39 #if !ENABLE(OILPAN) 40 // Oilpan: there is no known need for directly observing 41 // frameDestroyed() with Oilpan enabled, as its clearing is 42 // handled by keeping a weak reference. 43 // 44 // A weak callback version of frameDestroyed() can be reintroduced 45 // later, should the need arise. 46 virtual void frameDestroyed(); 47 #endif 48 virtual void willDetachFrameHost(); 49 50 LocalFrame* frame() const { return m_frame; } 51 52 virtual void trace(Visitor*); 53 54 protected: 55 #if !ENABLE(OILPAN) 56 virtual ~FrameDestructionObserver(); 57 #endif 58 59 void observeFrame(LocalFrame*); 60 61 RawPtrWillBeWeakMember<LocalFrame> m_frame; 62 }; 63 64 } 65 66 #endif 67
