1/*
2 * Copyright (C) 2017 Apple 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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "Frame.h"
29
30namespace WebCore {
31
32class NavigationDisabler {
33public:
34 NavigationDisabler(Frame* frame)
35 : m_frame(frame)
36 {
37 if (frame)
38 ++frame->mainFrame().m_navigationDisableCount;
39 else // Disable all navigations when destructing a frame-less document.
40 ++s_globalNavigationDisableCount;
41 }
42
43 ~NavigationDisabler()
44 {
45 if (m_frame) {
46 auto& mainFrame = m_frame->mainFrame();
47 ASSERT(mainFrame.m_navigationDisableCount);
48 --mainFrame.m_navigationDisableCount;
49 } else {
50 ASSERT(s_globalNavigationDisableCount);
51 --s_globalNavigationDisableCount;
52 }
53 }
54
55 static bool isNavigationAllowed(Frame& frame)
56 {
57 return !frame.mainFrame().m_navigationDisableCount && !s_globalNavigationDisableCount;
58 }
59
60private:
61 RefPtr<Frame> m_frame;
62
63 static unsigned s_globalNavigationDisableCount;
64};
65
66}
67