731685468a
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.
81 lines
2.4 KiB
C++
81 lines
2.4 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 {
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class Length {
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public:
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enum class Type {
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Auto,
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Px,
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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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bool is_auto() const { return m_type == Type::Auto; }
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bool is_absolute() const { return m_type == Type::Px; }
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bool is_relative() const { return m_type == Type::Em || m_type == Type::Rem; }
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float raw_value() const { return m_value; }
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float to_px(const LayoutNode&) const;
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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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const char* unit_name() const;
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Type m_type { Type::Auto };
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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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