mirror of
https://github.com/RGBCube/serenity
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498845ea2f
These are pretty rare, but they do come up in some places and it's not hard to support. The Gfx::Font information is approximate (and bad) but we can fix that separately.
130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/String.h>
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#include <LibWeb/Forward.h>
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namespace Web::CSS {
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class Length {
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public:
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enum class Type {
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Undefined,
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Percentage,
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Auto,
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Px,
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Pt,
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Ex,
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Em,
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Rem,
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};
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Length() { }
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Length(int value, Type type)
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: m_type(type)
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, m_value(value)
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{
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}
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Length(float value, Type type)
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: m_type(type)
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, m_value(value)
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{
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}
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static Length make_auto() { return Length(0, Type::Auto); }
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static Length make_px(float value) { return Length(value, Type::Px); }
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Length resolved(const Length& fallback_for_undefined, const LayoutNode& layout_node, float reference_for_percent) const
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{
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if (is_undefined())
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return fallback_for_undefined;
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if (is_percentage())
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return make_px(raw_value() / 100.0 * reference_for_percent);
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if (is_relative())
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return make_px(to_px(layout_node));
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return *this;
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}
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Length resolved_or_auto(const LayoutNode& layout_node, float reference_for_percent) const
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{
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return resolved(make_auto(), layout_node, reference_for_percent);
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}
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Length resolved_or_zero(const LayoutNode& layout_node, float reference_for_percent) const
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{
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return resolved(make_px(0), layout_node, reference_for_percent);
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}
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bool is_undefined_or_auto() const { return m_type == Type::Undefined || m_type == Type::Auto; }
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bool is_undefined() const { return m_type == Type::Undefined; }
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bool is_percentage() const { return m_type == Type::Percentage; }
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bool is_auto() const { return m_type == Type::Auto; }
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bool is_absolute() const { return m_type == Type::Px || m_type == Type::Pt; }
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bool is_relative() const { return m_type == Type::Ex || m_type == Type::Em || m_type == Type::Rem; }
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float raw_value() const { return m_value; }
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ALWAYS_INLINE float to_px(const LayoutNode& layout_node) const
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{
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if (is_relative())
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return relative_length_to_px(layout_node);
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switch (m_type) {
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case Type::Auto:
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return 0;
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case Type::Px:
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return m_value;
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case Type::Pt:
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return m_value * 1.33333333f;
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case Type::Undefined:
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case Type::Percentage:
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default:
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ASSERT_NOT_REACHED();
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}
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}
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String to_string() const
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{
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if (is_auto())
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return "[auto]";
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return String::format("[%g %s]", m_value, unit_name());
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}
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private:
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float relative_length_to_px(const LayoutNode&) const;
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const char* unit_name() const;
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Type m_type { Type::Undefined };
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float m_value { 0 };
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};
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inline const LogStream& operator<<(const LogStream& stream, const Length& value)
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{
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return stream << value.to_string();
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}
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}
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