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      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 #include "config.h"
     27 #include "core/frame/FrameDestructionObserver.h"
     28 
     29 #include "core/frame/Frame.h"
     30 
     31 namespace WebCore {
     32 
     33 FrameDestructionObserver::FrameDestructionObserver(Frame* frame)
     34     : m_frame(0)
     35 {
     36     observeFrame(frame);
     37 }
     38 
     39 FrameDestructionObserver::~FrameDestructionObserver()
     40 {
     41     observeFrame(0);
     42 
     43 }
     44 
     45 void FrameDestructionObserver::observeFrame(Frame* frame)
     46 {
     47     if (m_frame)
     48         m_frame->removeDestructionObserver(this);
     49 
     50     m_frame = frame;
     51 
     52     if (m_frame)
     53         m_frame->addDestructionObserver(this);
     54 }
     55 
     56 void FrameDestructionObserver::frameDestroyed()
     57 {
     58     m_frame = 0;
     59 }
     60 
     61 void FrameDestructionObserver::willDetachPage()
     62 {
     63     // Subclasses should override this function to handle this notification.
     64 }
     65 
     66 }
     67