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LibWeb: Implement the CSS revert keyword

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This is a universal value like `initial` and `inherit` and works by
reverting the current value to whatever we had at the start of the
current cascade origin.

The implementation is somewhat inefficient as we make a copy of all
current values at the start of each origin. I'm sure we can come up with
a way to make this faster eventually.
This commit is contained in:
Andreas Kling 2023-07-29 17:14:18 +02:00
parent 13d5d47b56
commit 8f29bdb62c
8 changed files with 257 additions and 187 deletions
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12
Userland/Libraries/LibWeb/CSS/StyleProperties.h
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@ -35,6 +35,12 @@ public:
}
}
struct StyleAndSourceDeclaration {
NonnullRefPtr<StyleValue const> style;
CSS::CSSStyleDeclaration const* declaration = nullptr;
};
using PropertyValues = Array<Optional<StyleAndSourceDeclaration>, to_underlying(CSS::last_property_id) + 1>;
auto& properties() { return m_property_values; }
auto const& properties() const { return m_property_values; }
@ -138,11 +144,7 @@ public:
private:
friend class StyleComputer;
struct StyleAndSourceDeclaration {
NonnullRefPtr<StyleValue const> style;
CSS::CSSStyleDeclaration const* declaration = nullptr;
};
Array<Optional<StyleAndSourceDeclaration>, to_underlying(CSS::last_property_id) + 1> m_property_values;
PropertyValues m_property_values;
Optional<CSS::Overflow> overflow(CSS::PropertyID) const;
Vector<CSS::ShadowData> shadow(CSS::PropertyID, Layout::Node const&) const;