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
|
/*
* Copyright (c) 2018-2023, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Utf8View.h>
#include <LibWeb/DOM/Range.h>
#include <LibWeb/Layout/LayoutState.h>
#include <LibWeb/Layout/LineBoxFragment.h>
#include <LibWeb/Layout/TextNode.h>
#include <LibWeb/Layout/Viewport.h>
#include <ctype.h>
namespace Web::Layout {
bool LineBoxFragment::ends_in_whitespace() const
{
auto text = this->text();
if (text.is_empty())
return false;
return isspace(text[text.length() - 1]);
}
bool LineBoxFragment::is_justifiable_whitespace() const
{
return text() == " ";
}
StringView LineBoxFragment::text() const
{
if (!is<TextNode>(layout_node()))
return {};
return verify_cast<TextNode>(layout_node()).text_for_rendering().substring_view(m_start, m_length);
}
CSSPixelRect const LineBoxFragment::absolute_rect() const
{
CSSPixelRect rect { {}, size() };
rect.set_location(m_layout_node->containing_block()->paint_box()->absolute_position());
rect.translate_by(offset());
return rect;
}
int LineBoxFragment::text_index_at(CSSPixels x) const
{
if (!is<TextNode>(layout_node()))
return 0;
auto& layout_text = verify_cast<TextNode>(layout_node());
auto& font = layout_text.font();
Utf8View view(text());
CSSPixels relative_x = x - absolute_x();
float glyph_spacing = font.glyph_spacing();
if (relative_x < 0)
return 0;
CSSPixels width_so_far = 0;
for (auto it = view.begin(); it != view.end(); ++it) {
auto previous_it = it;
CSSPixels glyph_width = font.glyph_or_emoji_width(it);
if ((width_so_far + (glyph_width + glyph_spacing) / 2) > relative_x)
return m_start + view.byte_offset_of(previous_it);
width_so_far += glyph_width + glyph_spacing;
}
return m_start + m_length;
}
CSSPixelRect LineBoxFragment::selection_rect(Gfx::Font const& font) const
{
if (layout_node().selection_state() == Node::SelectionState::None)
return {};
if (layout_node().selection_state() == Node::SelectionState::Full)
return absolute_rect();
if (!is<TextNode>(layout_node()))
return {};
auto selection = layout_node().root().selection();
if (!selection)
return {};
auto range = selection->range();
if (!range)
return {};
// FIXME: m_start and m_length should be unsigned and then we won't need these casts.
auto const start_index = static_cast<unsigned>(m_start);
auto const end_index = static_cast<unsigned>(m_start) + static_cast<unsigned>(m_length);
auto text = this->text();
if (layout_node().selection_state() == Node::SelectionState::StartAndEnd) {
// we are in the start/end node (both the same)
if (start_index > range->end_offset())
return {};
if (end_index < range->start_offset())
return {};
if (range->start_offset() == range->end_offset())
return {};
auto selection_start_in_this_fragment = max(0, range->start_offset() - m_start);
auto selection_end_in_this_fragment = min(m_length, range->end_offset() - m_start);
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
rect.set_width(pixel_width_of_selection);
return rect;
}
if (layout_node().selection_state() == Node::SelectionState::Start) {
// we are in the start node
if (end_index < range->start_offset())
return {};
auto selection_start_in_this_fragment = max(0, range->start_offset() - m_start);
auto selection_end_in_this_fragment = m_length;
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
rect.set_width(pixel_width_of_selection);
return rect;
}
if (layout_node().selection_state() == Node::SelectionState::End) {
// we are in the end node
if (start_index > range->end_offset())
return {};
auto selection_start_in_this_fragment = 0;
auto selection_end_in_this_fragment = min(range->end_offset() - m_start, m_length);
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
rect.set_width(pixel_width_of_selection);
return rect;
}
return {};
}
bool LineBoxFragment::is_atomic_inline() const
{
return layout_node().is_replaced_box() || (layout_node().display().is_inline_outside() && !layout_node().display().is_flow_inside());
}
}
|
