1 | /* |
2 | * Copyright (C) 2015 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 "RenderElement.h" |
29 | #include "RenderFragmentedFlow.h" |
30 | #include "RenderText.h" |
31 | #include "RenderView.h" |
32 | |
33 | namespace WebCore { |
34 | |
35 | class RenderTreePosition { |
36 | public: |
37 | explicit RenderTreePosition(RenderElement& parent) |
38 | : m_parent(parent) |
39 | { |
40 | } |
41 | RenderTreePosition(RenderElement& parent, RenderObject* nextSibling) |
42 | : m_parent(parent) |
43 | , m_nextSibling(makeWeakPtr(nextSibling)) |
44 | , m_hasValidNextSibling(true) |
45 | { |
46 | } |
47 | |
48 | RenderElement& parent() const { return m_parent; } |
49 | RenderObject* nextSibling() const { ASSERT(m_hasValidNextSibling); return m_nextSibling.get(); } |
50 | |
51 | void computeNextSibling(const Node&); |
52 | void moveToLastChild(); |
53 | void invalidateNextSibling() { m_hasValidNextSibling = false; } |
54 | void invalidateNextSibling(const RenderObject&); |
55 | |
56 | RenderObject* nextSiblingRenderer(const Node&) const; |
57 | |
58 | private: |
59 | RenderElement& m_parent; |
60 | WeakPtr<RenderObject> m_nextSibling { nullptr }; |
61 | bool m_hasValidNextSibling { false }; |
62 | #if !ASSERT_DISABLED |
63 | unsigned m_assertionLimitCounter { 0 }; |
64 | #endif |
65 | }; |
66 | |
67 | inline void RenderTreePosition::moveToLastChild() |
68 | { |
69 | m_nextSibling = nullptr; |
70 | m_hasValidNextSibling = true; |
71 | } |
72 | |
73 | } // namespace WebCore |
74 | |