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
|
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2022-2023, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/NonnullOwnPtr.h>
#include <AK/Variant.h>
#include <LibGfx/Font/Font.h>
#include <LibGfx/Rect.h>
#include <LibWeb/CSS/Length.h>
#include <LibWeb/CSS/Percentage.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/HTML/HTMLHtmlElement.h>
namespace Web::CSS {
Length::Length(int value, Type type)
: m_type(type)
, m_value(value)
{
}
Length::Length(float value, Type type)
: m_type(type)
, m_value(value)
{
}
Length::~Length() = default;
Length Length::make_auto()
{
return Length(0, Type::Auto);
}
Length Length::make_px(CSSPixels value)
{
return Length(value.value(), Type::Px);
}
Length Length::percentage_of(Percentage const& percentage) const
{
if (is_auto()) {
dbgln("Attempting to get percentage of an auto length, this seems wrong? But for now we just return the original length.");
return *this;
}
return Length { percentage.as_fraction() * raw_value(), m_type };
}
Length Length::resolved(Layout::Node const& layout_node) const
{
if (is_relative())
return make_px(to_px(layout_node));
if (!isfinite(m_value))
return make_auto();
return *this;
}
CSSPixels Length::relative_length_to_px(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
{
switch (m_type) {
case Type::Ex:
return m_value * font_metrics.x_height;
case Type::Em:
return m_value * font_size;
case Type::Ch:
// FIXME: Use layout_node.font().pixel_size() when writing-mode is not horizontal-tb (it has to be implemented first)
return m_value * (font_metrics.advance_of_ascii_zero + font_metrics.glyph_spacing);
case Type::Rem:
return m_value * root_font_size;
case Type::Vw:
return viewport_rect.width() * (m_value / 100);
case Type::Vh:
return viewport_rect.height() * (m_value / 100);
case Type::Vmin:
return min(viewport_rect.width(), viewport_rect.height()) * (m_value / 100);
case Type::Vmax:
return max(viewport_rect.width(), viewport_rect.height()) * (m_value / 100);
case Type::Lh:
return m_value * line_height;
case Type::Rlh:
return m_value * root_line_height;
default:
VERIFY_NOT_REACHED();
}
}
CSSPixels Length::to_px(Layout::Node const& layout_node) const
{
if (is_absolute())
return absolute_length_to_px();
if (!layout_node.document().browsing_context())
return 0;
auto const& viewport_rect = layout_node.document().browsing_context()->viewport_rect();
auto* root_element = layout_node.document().document_element();
if (!root_element || !root_element->layout_node())
return 0;
return to_px(viewport_rect, layout_node.font().pixel_metrics(), layout_node.computed_values().font_size(), root_element->layout_node()->computed_values().font_size(), layout_node.line_height(), root_element->layout_node()->line_height());
}
ErrorOr<String> Length::to_string() const
{
if (is_auto())
return "auto"_string;
return String::formatted("{}{}", m_value, unit_name());
}
char const* Length::unit_name() const
{
switch (m_type) {
case Type::Cm:
return "cm";
case Type::In:
return "in";
case Type::Px:
return "px";
case Type::Pt:
return "pt";
case Type::Mm:
return "mm";
case Type::Q:
return "Q";
case Type::Pc:
return "pc";
case Type::Ex:
return "ex";
case Type::Em:
return "em";
case Type::Ch:
return "ch";
case Type::Rem:
return "rem";
case Type::Auto:
return "auto";
case Type::Vh:
return "vh";
case Type::Vw:
return "vw";
case Type::Vmax:
return "vmax";
case Type::Vmin:
return "vmin";
case Type::Lh:
return "lh";
case Type::Rlh:
return "rlh";
}
VERIFY_NOT_REACHED();
}
Optional<Length::Type> Length::unit_from_name(StringView name)
{
if (name.equals_ignoring_ascii_case("px"sv)) {
return Length::Type::Px;
} else if (name.equals_ignoring_ascii_case("pt"sv)) {
return Length::Type::Pt;
} else if (name.equals_ignoring_ascii_case("pc"sv)) {
return Length::Type::Pc;
} else if (name.equals_ignoring_ascii_case("mm"sv)) {
return Length::Type::Mm;
} else if (name.equals_ignoring_ascii_case("rem"sv)) {
return Length::Type::Rem;
} else if (name.equals_ignoring_ascii_case("em"sv)) {
return Length::Type::Em;
} else if (name.equals_ignoring_ascii_case("ex"sv)) {
return Length::Type::Ex;
} else if (name.equals_ignoring_ascii_case("ch"sv)) {
return Length::Type::Ch;
} else if (name.equals_ignoring_ascii_case("vw"sv)) {
return Length::Type::Vw;
} else if (name.equals_ignoring_ascii_case("vh"sv)) {
return Length::Type::Vh;
} else if (name.equals_ignoring_ascii_case("vmax"sv)) {
return Length::Type::Vmax;
} else if (name.equals_ignoring_ascii_case("vmin"sv)) {
return Length::Type::Vmin;
} else if (name.equals_ignoring_ascii_case("cm"sv)) {
return Length::Type::Cm;
} else if (name.equals_ignoring_ascii_case("in"sv)) {
return Length::Type::In;
} else if (name.equals_ignoring_ascii_case("Q"sv)) {
return Length::Type::Q;
} else if (name.equals_ignoring_ascii_case("lh"sv)) {
return Length::Type::Lh;
} else if (name.equals_ignoring_ascii_case("rlh"sv)) {
return Length::Type::Rlh;
}
return {};
}
Optional<Length> Length::absolutize(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
{
if (is_px())
return {};
if (is_absolute() || is_relative()) {
auto px = to_px(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
return CSS::Length::make_px(px);
}
return {};
}
Length Length::absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
{
return absolutize(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(*this);
}
}
|
