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 are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef OrderIterator_h
32#define OrderIterator_h
33
34#include "wtf/Noncopyable.h"
35
36#include <set>
37
38namespace blink {
39
40class RenderBox;
41
42class OrderIterator {
43    WTF_MAKE_NONCOPYABLE(OrderIterator);
44public:
45    friend class OrderIteratorPopulator;
46
47    OrderIterator(const RenderBox*);
48
49    RenderBox* currentChild() const { return m_currentChild; }
50    RenderBox* first();
51    RenderBox* next();
52    void reset();
53
54private:
55    const RenderBox* m_containerBox;
56
57    RenderBox* m_currentChild;
58
59    typedef std::set<int> OrderValues;
60    OrderValues m_orderValues;
61    OrderValues::const_iterator m_orderValuesIterator;
62    bool m_isReset;
63};
64
65class OrderIteratorPopulator {
66public:
67    explicit OrderIteratorPopulator(OrderIterator& iterator)
68        : m_iterator(iterator)
69    {
70        m_iterator.m_orderValues.clear();
71    }
72
73    ~OrderIteratorPopulator();
74
75    void collectChild(const RenderBox*);
76
77private:
78    OrderIterator& m_iterator;
79};
80
81} // namespace blink
82
83#endif //  OrderIterator_h
84