1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/layout/ng/ng_block_child_iterator.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/renderer/core/layout/ng/ng_block_break_token.h"
#include "third_party/blink/renderer/core/layout/ng/ng_block_node.h"
#include "third_party/blink/renderer/core/layout/ng/ng_layout_test.h"
namespace blink {
namespace {
using NGBlockChildIteratorTest = NGLayoutTest;
TEST_F(NGBlockChildIteratorTest, NullFirstChild) {
NGBlockChildIterator iterator(nullptr, nullptr);
ASSERT_EQ(NGBlockChildIterator::Entry(nullptr, nullptr),
iterator.NextChild());
}
TEST_F(NGBlockChildIteratorTest, NoBreakToken) {
SetBodyInnerHTML(R"HTML(
<div id='child1'></div>
<div id='child2'></div>
<div id='child3'></div>
)HTML");
NGLayoutInputNode node1 =
NGBlockNode(ToLayoutBox(GetLayoutObjectByElementId("child1")));
NGLayoutInputNode node2 = node1.NextSibling();
NGLayoutInputNode node3 = node2.NextSibling();
// The iterator should loop through three children.
NGBlockChildIterator iterator(node1, nullptr);
ASSERT_EQ(NGBlockChildIterator::Entry(node1, nullptr), iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node2, nullptr), iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node3, nullptr), iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(nullptr, nullptr),
iterator.NextChild());
}
TEST_F(NGBlockChildIteratorTest, BreakTokens) {
SetBodyInnerHTML(R"HTML(
<div id='container'>
<div id='child1'></div>
<div id='child2'></div>
<div id='child3'></div>
<div id='child4'></div>
</div>
)HTML");
NGBlockNode container =
NGBlockNode(ToLayoutBox(GetLayoutObjectByElementId("container")));
NGLayoutInputNode node1 = container.FirstChild();
NGLayoutInputNode node2 = node1.NextSibling();
NGLayoutInputNode node3 = node2.NextSibling();
NGLayoutInputNode node4 = node3.NextSibling();
NGBreakTokenVector empty_tokens_list;
scoped_refptr<NGBreakToken> child_token1 = NGBlockBreakToken::Create(
node1, LayoutUnit(), 0, empty_tokens_list, kBreakAppealPerfect,
/* has_seen_all_children */ false);
scoped_refptr<NGBreakToken> child_token2 = NGBlockBreakToken::Create(
node2, LayoutUnit(), 0, empty_tokens_list, kBreakAppealPerfect,
/* has_seen_all_children */ false);
scoped_refptr<NGBreakToken> child_token3 = NGBlockBreakToken::Create(
node3, LayoutUnit(), 0, empty_tokens_list, kBreakAppealPerfect,
/* has_seen_all_children */ false);
NGBreakTokenVector child_break_tokens;
child_break_tokens.push_back(child_token1);
scoped_refptr<NGBlockBreakToken> parent_token = NGBlockBreakToken::Create(
container, LayoutUnit(), 0, child_break_tokens, kBreakAppealPerfect,
/* has_seen_all_children */ false);
NGBlockChildIterator iterator(node1, parent_token.get());
ASSERT_EQ(NGBlockChildIterator::Entry(node1, child_token1.get()),
iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node2, nullptr), iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node3, nullptr), iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node4, nullptr), iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(nullptr, nullptr),
iterator.NextChild());
child_break_tokens.clear();
child_break_tokens.push_back(child_token1);
child_break_tokens.push_back(child_token2);
parent_token = NGBlockBreakToken::Create(
container, LayoutUnit(), 0, child_break_tokens, kBreakAppealPerfect,
/* has_seen_all_children */ false);
iterator = NGBlockChildIterator(node1, parent_token.get());
ASSERT_EQ(NGBlockChildIterator::Entry(node1, child_token1.get()),
iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node2, child_token2.get()),
iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node3, nullptr), iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node4, nullptr), iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(nullptr, nullptr),
iterator.NextChild());
child_break_tokens.clear();
child_break_tokens.push_back(child_token2);
child_break_tokens.push_back(child_token3);
parent_token = NGBlockBreakToken::Create(
container, LayoutUnit(), 0, child_break_tokens, kBreakAppealPerfect,
/* has_seen_all_children */ false);
iterator = NGBlockChildIterator(node1, parent_token.get());
ASSERT_EQ(NGBlockChildIterator::Entry(node2, child_token2.get()),
iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node3, child_token3.get()),
iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node4, nullptr), iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(nullptr, nullptr),
iterator.NextChild());
child_break_tokens.clear();
child_break_tokens.push_back(child_token1);
child_break_tokens.push_back(child_token3);
parent_token = NGBlockBreakToken::Create(
container, LayoutUnit(), 0, child_break_tokens, kBreakAppealPerfect,
/* has_seen_all_children */ false);
iterator = NGBlockChildIterator(node1, parent_token.get());
ASSERT_EQ(NGBlockChildIterator::Entry(node1, child_token1.get()),
iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node3, child_token3.get()),
iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(node4, nullptr), iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(nullptr, nullptr),
iterator.NextChild());
}
TEST_F(NGBlockChildIteratorTest, SeenAllChildren) {
SetBodyInnerHTML(R"HTML(
<div id='container'>
<div id='child1'></div>
<div id='child2'></div>
</div>
)HTML");
NGBlockNode container =
NGBlockNode(ToLayoutBox(GetLayoutObjectByElementId("container")));
NGLayoutInputNode node1 = container.FirstChild();
NGBreakTokenVector empty_tokens_list;
scoped_refptr<NGBreakToken> child_token1 = NGBlockBreakToken::Create(
node1, LayoutUnit(), 0, empty_tokens_list, kBreakAppealPerfect,
/* has_seen_all_children */ false);
NGBreakTokenVector child_break_tokens;
child_break_tokens.push_back(child_token1);
scoped_refptr<NGBlockBreakToken> parent_token = NGBlockBreakToken::Create(
container, LayoutUnit(), 0, child_break_tokens, kBreakAppealPerfect,
/* has_seen_all_children */ true);
// We have a break token for #child1, but have seen all children. This happens
// e.g. when #child1 has overflow into a new fragmentainer, while #child2 was
// finished in an earlier fragmentainer.
NGBlockChildIterator iterator(node1, parent_token.get());
ASSERT_EQ(NGBlockChildIterator::Entry(node1, child_token1.get()),
iterator.NextChild());
ASSERT_EQ(NGBlockChildIterator::Entry(nullptr, nullptr),
iterator.NextChild());
child_break_tokens.clear();
parent_token = NGBlockBreakToken::Create(
container, LayoutUnit(), 0, child_break_tokens, kBreakAppealPerfect,
/* has_seen_all_children */ true);
// We have no break tokens, but have seen all children. This happens e.g. when
// we have a large container with fixed block-size, with empty space at the
// end, not occupied by any children.
iterator = NGBlockChildIterator(node1, parent_token.get());
ASSERT_EQ(NGBlockChildIterator::Entry(nullptr, nullptr),
iterator.NextChild());
}
} // namespace
} // namespace blink
|
