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 | |
30 | namespace WebCore { |
31 | |
32 | class NavigationDisabler { |
33 | public: |
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 | |
60 | private: |
61 | RefPtr<Frame> m_frame; |
62 | |
63 | static unsigned s_globalNavigationDisableCount; |
64 | }; |
65 | |
66 | } |
67 | |