1/*
2 * Copyright (C) 2009 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 COMPUTER, 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 COMPUTER, 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#ifndef RenderObjectChildList_h
27#define RenderObjectChildList_h
28
29#include "platform/heap/Handle.h"
30#include "wtf/Forward.h"
31
32namespace blink {
33
34class RenderObject;
35
36class RenderObjectChildList {
37    DISALLOW_ALLOCATION();
38public:
39    RenderObjectChildList()
40        : m_firstChild(nullptr)
41        , m_lastChild(nullptr)
42    {
43    }
44    void trace(Visitor*);
45
46    RenderObject* firstChild() const { return m_firstChild.get(); }
47    RenderObject* lastChild() const { return m_lastChild.get(); }
48
49    // FIXME: Temporary while RenderBox still exists. Eventually this will just happen during insert/append/remove methods on the child list, and nobody
50    // will need to manipulate firstChild or lastChild directly.
51    void setFirstChild(RenderObject* child) { m_firstChild = child; }
52    void setLastChild(RenderObject* child) { m_lastChild = child; }
53
54    void destroyLeftoverChildren();
55
56    RenderObject* removeChildNode(RenderObject* owner, RenderObject*, bool notifyRenderer = true);
57    void insertChildNode(RenderObject* owner, RenderObject* newChild, RenderObject* beforeChild, bool notifyRenderer = true);
58    void appendChildNode(RenderObject* owner, RenderObject* newChild, bool notifyRenderer = true)
59    {
60        insertChildNode(owner, newChild, 0, notifyRenderer);
61    }
62
63private:
64    void invalidatePaintOnRemoval(const RenderObject& oldChild);
65
66    RawPtrWillBeMember<RenderObject> m_firstChild;
67    RawPtrWillBeMember<RenderObject> m_lastChild;
68};
69
70} // namespace blink
71
72#endif // RenderObjectChildList_h
73