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#include "config.h"
32#include "core/rendering/OrderIterator.h"
33
34#include "core/rendering/RenderBox.h"
35
36namespace blink {
37
38OrderIterator::OrderIterator(const RenderBox* containerBox)
39    : m_containerBox(containerBox)
40    , m_currentChild(0)
41    , m_isReset(false)
42{
43}
44
45RenderBox* OrderIterator::first()
46{
47    reset();
48    return next();
49}
50
51RenderBox* OrderIterator::next()
52{
53    do {
54        if (!m_currentChild) {
55            if (m_orderValuesIterator == m_orderValues.end())
56                return 0;
57
58            if (!m_isReset) {
59                ++m_orderValuesIterator;
60                if (m_orderValuesIterator == m_orderValues.end())
61                    return 0;
62            } else {
63                m_isReset = false;
64            }
65
66            m_currentChild = m_containerBox->firstChildBox();
67        } else {
68            m_currentChild = m_currentChild->nextSiblingBox();
69        }
70    } while (!m_currentChild || m_currentChild->style()->order() != *m_orderValuesIterator);
71
72    return m_currentChild;
73}
74
75void OrderIterator::reset()
76{
77    m_currentChild = 0;
78    m_orderValuesIterator = m_orderValues.begin();
79    m_isReset = true;
80}
81
82OrderIteratorPopulator::~OrderIteratorPopulator()
83{
84    m_iterator.reset();
85}
86
87void OrderIteratorPopulator::collectChild(const RenderBox* child)
88{
89    m_iterator.m_orderValues.insert(child->style()->order());
90}
91
92} // namespace blink
93