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
|
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/NonnullOwnPtr.h>
#include <AK/Variant.h>
#include <LibGfx/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() = default;
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::make_auto()
{
return Length(0, Type::Auto);
}
Length Length::make_px(float value)
{
return Length(value, Type::Px);
}
Length Length::make_calculated(NonnullRefPtr<CalculatedStyleValue> calculated_style_value)
{
Length length { 0, Type::Calculated };
length.m_calculated_style = move(calculated_style_value);
return length;
}
Length Length::percentage_of(Percentage const& percentage) const
{
if (is_undefined_or_auto()) {
dbgln("Attempting to get percentage of an undefined or 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(Length const& fallback_for_undefined, Layout::Node const& layout_node) const
{
if (is_undefined())
return fallback_for_undefined;
if (is_calculated())
return m_calculated_style->resolve_length(layout_node).release_value();
if (is_relative())
return make_px(to_px(layout_node));
return *this;
}
Length Length::resolved_or_auto(Layout::Node const& layout_node) const
{
return resolved(make_auto(), layout_node);
}
Length Length::resolved_or_zero(Layout::Node const& layout_node) const
{
return resolved(make_px(0), layout_node);
}
float Length::relative_length_to_px(Gfx::IntRect const& viewport_rect, Gfx::FontMetrics const& font_metrics, float root_font_size) const
{
switch (m_type) {
case Type::Ex:
return m_value * font_metrics.x_height;
case Type::Em:
return m_value * font_metrics.size;
case Type::Ch:
// FIXME: Use layout_node.font().glyph_height() when writing-mode is not horizontal-tb (it has to be implemented first)
return m_value * (font_metrics.glyph_width + 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);
default:
VERIFY_NOT_REACHED();
}
}
float Length::to_px(Layout::Node const& layout_node) const
{
if (!layout_node.document().browsing_context())
return 0;
auto 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().metrics('M'), root_element->layout_node()->font().presentation_size());
}
const char* 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::Undefined:
return "undefined";
case Type::Vh:
return "vh";
case Type::Vw:
return "vw";
case Type::Vmax:
return "vmax";
case Type::Vmin:
return "vmin";
case Type::Calculated:
return "calculated";
}
VERIFY_NOT_REACHED();
}
}
|
