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.
84 lines
3 KiB
C++
84 lines
3 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/HashMap.h>
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#include <AK/NonnullRefPtr.h>
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#include <LibGfx/Font.h>
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#include <LibGfx/Forward.h>
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#include <LibWeb/CSS/StyleValue.h>
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namespace Web {
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class StyleProperties : public RefCounted<StyleProperties> {
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public:
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StyleProperties();
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explicit StyleProperties(const StyleProperties&);
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static NonnullRefPtr<StyleProperties> create() { return adopt(*new StyleProperties); }
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NonnullRefPtr<StyleProperties> clone() const;
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template<typename Callback>
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inline void for_each_property(Callback callback) const
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{
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for (auto& it : m_property_values)
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callback((CSS::PropertyID)it.key, *it.value);
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}
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void set_property(CSS::PropertyID, NonnullRefPtr<StyleValue> value);
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Optional<NonnullRefPtr<StyleValue>> property(CSS::PropertyID) const;
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Length length_or_fallback(CSS::PropertyID, const Length& fallback) const;
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Length length_or_fallback(CSS::PropertyID, const Length& fallback, float reference_for_percentages) const;
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String string_or_fallback(CSS::PropertyID, const StringView& fallback) const;
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Color color_or_fallback(CSS::PropertyID, const Document&, Color fallback) const;
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const Gfx::Font& font() const
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{
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if (!m_font)
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load_font();
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return *m_font;
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}
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float line_height(const LayoutNode&) const;
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bool operator==(const StyleProperties&) const;
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bool operator!=(const StyleProperties& other) const { return !(*this == other); }
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CSS::Position position() const;
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private:
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HashMap<unsigned, NonnullRefPtr<StyleValue>> m_property_values;
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void load_font() const;
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mutable RefPtr<Gfx::Font> m_font;
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};
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}
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