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LibWeb: Start fleshing out support for relative CSS units

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This patch introduces support for more than just "absolute px" units in
our Length class. It now also supports "em" and "rem", which are units
relative to the font-size of the current layout node and the <html>
element's layout node respectively.
This commit is contained in:
Andreas Kling 2020-06-07 17:55:46 +02:00
parent d93bf78346
commit 731685468a
16 changed files with 163 additions and 92 deletions
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64
Libraries/LibWeb/CSS/Length.cpp Normal file
View file

@ -0,0 +1,64 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibWeb/CSS/Length.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/HTMLHtmlElement.h>
namespace Web {
float Length::to_px(const LayoutNode& layout_node) const
{
switch (m_type) {
case Type::Auto:
return 0;
case Type::Px:
return m_value;
case Type::Em:
return m_value * layout_node.font_size();
case Type::Rem:
return m_value * layout_node.document().document_element()->layout_node()->font_size();
default:
ASSERT_NOT_REACHED();
}
}
const char* Length::unit_name() const
{
switch (m_type) {
case Type::Px:
return "px";
case Type::Em:
return "em";
case Type::Rem:
return "rem";
case Type::Auto:
return "auto";
}
ASSERT_NOT_REACHED();
}
}

27
Libraries/LibWeb/CSS/Length.h
View file

@ -27,6 +27,7 @@
#pragma once
#include <AK/String.h>
#include <LibWeb/Forward.h>
namespace Web {
@ -34,10 +35,12 @@ class Length {
public:
enum class Type {
Auto,
Absolute,
Px,
Em,
Rem,
};
Length() {}
Length() { }
Length(int value, Type type)
: m_type(type)
, m_value(value)
@ -48,28 +51,24 @@ public:
, m_value(value)
{
}
~Length() {}
bool is_auto() const { return m_type == Type::Auto; }
bool is_absolute() const { return m_type == Type::Absolute; }
bool is_absolute() const { return m_type == Type::Px; }
bool is_relative() const { return m_type == Type::Em || m_type == Type::Rem; }
float value() const { return m_value; }
float raw_value() const { return m_value; }
float to_px(const LayoutNode&) const;
String to_string() const
{
if (is_auto())
return "[Length/auto]";
return String::format("%g [Length/px]", m_value);
}
float to_px() const
{
if (is_auto())
return 0;
return m_value;
return "[auto]";
return String::format("[%g %s]", m_value, unit_name());
}
private:
const char* unit_name() const;
Type m_type { Type::Auto };
float m_value { 0 };
};

4
Libraries/LibWeb/CSS/StyleProperties.cpp
View file

@ -172,11 +172,11 @@ void StyleProperties::load_font() const
return;
}
float StyleProperties::line_height() const
float StyleProperties::line_height(const LayoutNode& layout_node) const
{
auto line_height_length = length_or_fallback(CSS::PropertyID::LineHeight, {});
if (line_height_length.is_absolute())
return (float)line_height_length.to_px();
return (float)line_height_length.to_px(layout_node);
return (float)font().glyph_height() * 1.4f;
}

2
Libraries/LibWeb/CSS/StyleProperties.h
View file

@ -66,7 +66,7 @@ public:
return *m_font;
}
float line_height() const;
float line_height(const LayoutNode&) const;
bool operator==(const StyleProperties&) const;
bool operator!=(const StyleProperties& other) const { return !(*this == other); }

2
Libraries/LibWeb/CSS/StyleResolver.cpp
View file

@ -190,7 +190,7 @@ static void set_property_expanding_shorthands(StyleProperties& style, CSS::Prope
if (auto value = parse_line_style(parts[0])) {
set_property_border_style(style, value.release_nonnull());
set_property_border_color(style, ColorStyleValue::create(Gfx::Color::Black));
set_property_border_width(style, LengthStyleValue::create(Length(3, Length::Type::Absolute)));
set_property_border_width(style, LengthStyleValue::create(Length(3, Length::Type::Px)));
return;
}
}

2
Libraries/LibWeb/CSS/StyleValue.h
View file

@ -212,7 +212,7 @@ public:
virtual String to_string() const override { return String::format("%g%%", m_percentage); }
Length to_length(float reference) const { return Length((m_percentage / 100.0f) * reference, Length::Type::Absolute); }
Length to_length(float reference) const { return Length((m_percentage / 100.0f) * reference, Length::Type::Px); }
private:
virtual Length to_length() const override { return {}; }