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
36 namespace WebCore {
37
OrderIterator(const RenderBox * containerBox)38 OrderIterator::OrderIterator(const RenderBox* containerBox)
39 : m_containerBox(containerBox)
40 , m_currentChild(0)
41 , m_isReset(false)
42 {
43 }
44
first()45 RenderBox* OrderIterator::first()
46 {
47 reset();
48 return next();
49 }
50
next()51 RenderBox* 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 = firstChildBox();
67 } else {
68 m_currentChild = nextSiblingBox();
69 }
70 } while (!m_currentChild || m_currentChild->style()->order() != *m_orderValuesIterator);
71
72 return m_currentChild;
73 }
74
reset()75 void OrderIterator::reset()
76 {
77 m_currentChild = 0;
78 m_orderValuesIterator = m_orderValues.begin();
79 m_isReset = true;
80 }
81
firstChildBox()82 RenderBox* OrderIterator::firstChildBox()
83 {
84 if (m_children.isEmpty())
85 return m_containerBox->firstChildBox();
86
87 m_childIndex = 0;
88 return m_children[0];
89 }
90
nextSiblingBox()91 RenderBox* OrderIterator::nextSiblingBox()
92 {
93 if (m_children.isEmpty())
94 return m_currentChild->nextSiblingBox();
95
96 if (m_childIndex >= m_children.size() - 1)
97 return 0;
98
99 return m_children[++m_childIndex];
100 }
101
~OrderIteratorPopulator()102 OrderIteratorPopulator::~OrderIteratorPopulator()
103 {
104 m_iterator.reset();
105 }
106
storeChild(RenderBox * child)107 void OrderIteratorPopulator::storeChild(RenderBox* child)
108 {
109 m_iterator.m_children.append(child);
110
111 collectChild(child);
112 }
113
collectChild(const RenderBox * child)114 void OrderIteratorPopulator::collectChild(const RenderBox* child)
115 {
116 m_iterator.m_orderValues.insert(child->style()->order());
117 }
118
119 } // namespace WebCore
120