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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
// 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/inline/ng_physical_line_box_fragment.h"
#include "third_party/blink/renderer/core/editing/editing_utilities.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_inline_break_token.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_inline_fragment_traversal.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_line_box_fragment_builder.h"
#include "third_party/blink/renderer/core/layout/ng/ng_fragment.h"
#include "third_party/blink/renderer/core/layout/ng/ng_relative_utils.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
namespace blink {
namespace {
struct SameSizeAsNGPhysicalLineBoxFragment : NGPhysicalContainerFragment {
NGLineHeightMetrics metrics;
};
static_assert(sizeof(NGPhysicalLineBoxFragment) ==
sizeof(SameSizeAsNGPhysicalLineBoxFragment),
"NGPhysicalLineBoxFragment should stay small");
bool IsInlineLeaf(const NGPhysicalFragment& fragment) {
if (fragment.IsText())
return true;
return fragment.IsBox() && fragment.IsAtomicInline();
}
bool IsEditableFragment(const NGPhysicalFragment& fragment) {
if (!fragment.GetNode())
return false;
return HasEditableStyle(*fragment.GetNode());
}
} // namespace
scoped_refptr<const NGPhysicalLineBoxFragment>
NGPhysicalLineBoxFragment::Create(NGLineBoxFragmentBuilder* builder) {
// We store the children list inline in the fragment as a flexible
// array. Therefore, we need to make sure to allocate enough space for
// that array here, which requires a manual allocation + placement new.
// The initialization of the array is done by NGPhysicalContainerFragment;
// we pass the buffer as a constructor argument.
void* data = ::WTF::Partitions::FastMalloc(
sizeof(NGPhysicalLineBoxFragment) +
builder->children_.size() * sizeof(NGLink),
::WTF::GetStringWithTypeName<NGPhysicalLineBoxFragment>());
new (data) NGPhysicalLineBoxFragment(builder);
return base::AdoptRef(static_cast<NGPhysicalLineBoxFragment*>(data));
}
NGPhysicalLineBoxFragment::NGPhysicalLineBoxFragment(
NGLineBoxFragmentBuilder* builder)
: NGPhysicalContainerFragment(builder,
builder->GetWritingMode(),
children_,
kFragmentLineBox,
builder->line_box_type_),
metrics_(builder->metrics_) {
// A line box must have a metrics unless it's an empty line box.
DCHECK(!metrics_.IsEmpty() || IsEmptyLineBox());
base_direction_ = static_cast<unsigned>(builder->base_direction_);
has_hanging_ = builder->hang_inline_size_ != 0;
has_propagated_descendants_ = has_floating_descendants_ ||
HasOutOfFlowPositionedDescendants() ||
builder->unpositioned_list_marker_;
}
NGLineHeightMetrics NGPhysicalLineBoxFragment::BaselineMetrics(
FontBaseline) const {
// TODO(kojii): Computing other baseline types than the used one is not
// implemented yet.
// TODO(kojii): We might need locale/script to look up OpenType BASE table.
return metrics_;
}
PhysicalRect NGPhysicalLineBoxFragment::ScrollableOverflow(
const LayoutObject* container,
const ComputedStyle* container_style,
PhysicalSize container_physical_size) const {
WritingMode container_writing_mode = container_style->GetWritingMode();
TextDirection container_direction = container_style->Direction();
PhysicalRect overflow({}, Size());
for (const auto& child : Children()) {
PhysicalRect child_scroll_overflow =
child->ScrollableOverflowForPropagation(container);
child_scroll_overflow.offset += child.Offset();
// Chop the hanging part from scrollable overflow. Children overflow in
// inline direction should hang, which should not cause scroll.
// TODO(kojii): Should move to text fragment to make this more accurate.
if (UNLIKELY(has_hanging_ && !child->IsFloatingOrOutOfFlowPositioned())) {
if (IsHorizontalWritingMode(container_writing_mode)) {
if (child_scroll_overflow.offset.left < 0)
child_scroll_overflow.offset.left = LayoutUnit();
if (child_scroll_overflow.Right() > Size().width)
child_scroll_overflow.ShiftRightEdgeTo(Size().width);
} else {
if (child_scroll_overflow.offset.top < 0)
child_scroll_overflow.offset.top = LayoutUnit();
if (child_scroll_overflow.Bottom() > Size().height)
child_scroll_overflow.ShiftBottomEdgeTo(Size().height);
}
}
// If child has the same style as parent, parent will compute relative
// offset.
if (&child->Style() != container_style) {
child_scroll_overflow.offset +=
ComputeRelativeOffset(child->Style(), container_writing_mode,
container_direction, container_physical_size);
}
overflow.Unite(child_scroll_overflow);
}
return overflow;
}
const NGPhysicalFragment* NGPhysicalLineBoxFragment::FirstLogicalLeaf() const {
if (Children().empty())
return nullptr;
// TODO(xiaochengh): This isn't correct for mixed Bidi. Fix it. Besides, we
// should compute and store it during layout.
const TextDirection direction = Style().Direction();
const NGPhysicalFragment* runner = this;
while (const auto* runner_as_container =
DynamicTo<NGPhysicalContainerFragment>(runner)) {
if (runner->IsBlockFormattingContextRoot())
break;
if (runner_as_container->Children().empty())
break;
runner = direction == TextDirection::kLtr
? runner_as_container->Children().front().get()
: runner_as_container->Children().back().get();
}
DCHECK_NE(runner, this);
return runner;
}
const NGPhysicalFragment* NGPhysicalLineBoxFragment::LastLogicalLeaf() const {
if (Children().empty())
return nullptr;
// TODO(xiaochengh): This isn't correct for mixed Bidi. Fix it. Besides, we
// should compute and store it during layout.
const TextDirection direction = Style().Direction();
const NGPhysicalFragment* runner = this;
while (const auto* runner_as_container =
DynamicTo<NGPhysicalContainerFragment>(runner)) {
if (runner->IsBlockFormattingContextRoot())
break;
if (runner_as_container->Children().empty())
break;
runner = direction == TextDirection::kLtr
? runner_as_container->Children().back().get()
: runner_as_container->Children().front().get();
}
DCHECK_NE(runner, this);
return runner;
}
bool NGPhysicalLineBoxFragment::HasSoftWrapToNextLine() const {
const auto& break_token = To<NGInlineBreakToken>(*BreakToken());
return !break_token.IsFinished() && !break_token.IsForcedBreak();
}
PhysicalOffset NGPhysicalLineBoxFragment::LineStartPoint() const {
const LogicalOffset logical_start; // (0, 0)
const PhysicalSize pixel_size(LayoutUnit(1), LayoutUnit(1));
return logical_start.ConvertToPhysical(Style().GetWritingMode(),
BaseDirection(), Size(), pixel_size);
}
PhysicalOffset NGPhysicalLineBoxFragment::LineEndPoint() const {
const LayoutUnit inline_size =
NGFragment(Style().GetWritingMode(), *this).InlineSize();
const LogicalOffset logical_end(inline_size, LayoutUnit());
const PhysicalSize pixel_size(LayoutUnit(1), LayoutUnit(1));
return logical_end.ConvertToPhysical(Style().GetWritingMode(),
BaseDirection(), Size(), pixel_size);
}
const LayoutObject* NGPhysicalLineBoxFragment::ClosestLeafChildForPoint(
const PhysicalOffset& point,
bool only_editable_leaves) const {
const PhysicalSize unit_square(LayoutUnit(1), LayoutUnit(1));
const LogicalOffset logical_point = point.ConvertToLogical(
Style().GetWritingMode(), BaseDirection(), Size(), unit_square);
const LayoutUnit inline_offset = logical_point.inline_offset;
const NGPhysicalFragment* closest_leaf_child = nullptr;
LayoutUnit closest_leaf_distance;
for (const auto& descendant :
NGInlineFragmentTraversal::DescendantsOf(*this)) {
const NGPhysicalFragment& fragment = *descendant.fragment;
if (!fragment.GetLayoutObject())
continue;
if (!IsInlineLeaf(fragment) || fragment.IsListMarker())
continue;
if (only_editable_leaves && !IsEditableFragment(fragment))
continue;
const LogicalSize fragment_logical_size =
fragment.Size().ConvertToLogical(Style().GetWritingMode());
const LogicalOffset fragment_logical_offset =
descendant.offset_to_container_box.ConvertToLogical(
Style().GetWritingMode(), BaseDirection(), Size(), fragment.Size());
const LayoutUnit inline_min = fragment_logical_offset.inline_offset;
const LayoutUnit inline_max = fragment_logical_offset.inline_offset +
fragment_logical_size.inline_size;
if (inline_offset >= inline_min && inline_offset < inline_max)
return fragment.GetLayoutObject();
const LayoutUnit distance =
inline_offset < inline_min ? inline_min - inline_offset
: inline_offset - inline_max + LayoutUnit(1);
if (!closest_leaf_child || distance < closest_leaf_distance) {
closest_leaf_child = &fragment;
closest_leaf_distance = distance;
}
}
if (!closest_leaf_child)
return nullptr;
return closest_leaf_child->GetLayoutObject();
}
} // namespace blink
|
