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585849fcf0
e.g., `@container (width >= 300px) {}` and similar.
During style computation, flag any elements whose style depends on a
size container. Then re-evaluate their style after the initial layout
has been computed and size containers have a size. This may take
multiple passes, as these may have further descendants that depend on
their size, etc. We limit this to 8 passes currently.
SizeFeature itself is very similar to MediaFeature, but queries the
container element instead. There are only 6 size features specified, so
they're hard-coded instead of generated from JSON.
Also add a counter test for the narrower restyle path.
68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/*
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* Copyright (c) 2026, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/FlyString.h>
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#include <AK/Optional.h>
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#include <LibWeb/CSS/CSSConditionRule.h>
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#include <LibWeb/Forward.h>
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namespace Web::CSS {
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// https://drafts.csswg.org/css-conditional-5/#dictdef-csscontainercondition
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struct CSSContainerCondition {
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String name;
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String query;
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};
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// https://drafts.csswg.org/css-conditional-5/#the-csscontainerrule-interface
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class CSSContainerRule final : public CSSConditionRule {
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WEB_PLATFORM_OBJECT(CSSContainerRule, CSSConditionRule);
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GC_DECLARE_ALLOCATOR(CSSContainerRule);
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public:
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struct Condition {
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Optional<FlyString> container_name;
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RefPtr<ContainerQuery> container_query;
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};
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[[nodiscard]] static GC::Ref<CSSContainerRule> create(JS::Realm&, Vector<Condition>&&, CSSRuleList&);
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virtual ~CSSContainerRule() override;
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virtual String condition_text() const override;
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virtual bool condition_matches() const override;
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bool matches(DOM::AbstractElement const&) const;
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bool contains_size_feature() const;
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String container_name() const;
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String container_query() const;
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// FIXME: Should be FrozenArray
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Vector<CSSContainerCondition> conditions() const;
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virtual void for_each_effective_rule(TraversalOrder, Function<void(CSSRule const&)> const& callback) const override;
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private:
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CSSContainerRule(JS::Realm&, Vector<Condition>&&, CSSRuleList&);
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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virtual void clear_caches() override;
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virtual String serialized() const override;
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CSSContainerRule const* find_parent_container_rule() const;
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bool conditions_match(DOM::AbstractElement const&) const;
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Vector<Condition> m_conditions;
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mutable GC::Ptr<CSSContainerRule const> m_cached_parent_container_rule;
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mutable bool m_parent_container_rule_cache_valid { false };
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};
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template<>
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inline bool CSSRule::fast_is<CSSContainerRule>() const { return type() == CSSRule::Type::Container; }
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}
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