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 "FrameDestructionObserver.h"
28
29#include "Frame.h"
30
31namespace WebCore {
32
33FrameDestructionObserver::FrameDestructionObserver(Frame* frame)
34 : m_frame(nullptr)
35{
36 observeFrame(frame);
37}
38
39FrameDestructionObserver::~FrameDestructionObserver()
40{
41 observeFrame(nullptr);
42
43}
44
45void 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
56void FrameDestructionObserver::frameDestroyed()
57{
58 m_frame = nullptr;
59}
60
61void FrameDestructionObserver::willDetachPage()
62{
63 // Subclasses should override this function to handle this notification.
64}
65
66}
67