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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.
72 lines
2.3 KiB
C++
72 lines
2.3 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/NonnullOwnPtr.h>
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#include <AK/RefCounted.h>
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#include <LibWeb/CSS/BooleanExpression.h>
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#include <LibWeb/CSS/FeatureQuery.h>
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namespace Web::CSS {
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enum class SizeFeatureID : u8 {
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AspectRatio,
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BlockSize,
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Height,
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InlineSize,
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Orientation,
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Width,
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};
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// https://drafts.csswg.org/css-conditional-5/#size-container
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class SizeFeature final : public FeatureQuery<SizeFeature, SizeFeatureID> {
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public:
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using Base = FeatureQuery<SizeFeature, SizeFeatureID>;
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virtual MatchResult evaluate(BooleanExpressionEvaluationContext const&) const override;
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virtual void collect_container_query_feature_requirements(ContainerQueryFeatureRequirements&) const override;
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virtual void dump(StringBuilder&, int indent_levels = 0) const override;
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static StringView serialize_feature_id(SizeFeatureID);
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static bool keyword_is_falsey(SizeFeatureID, Keyword);
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private:
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friend Base;
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SizeFeature(Type type, SizeFeatureID id, Variant<Empty, FeatureValue, Range> value = {})
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: Base(type, id, move(value))
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{
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}
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};
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// https://drafts.csswg.org/css-conditional-5/#container-rule
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class WEB_API ContainerQuery final : public RefCounted<ContainerQuery> {
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public:
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static NonnullRefPtr<ContainerQuery> create(NonnullOwnPtr<BooleanExpression>&&);
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bool matches() const { return m_matches; }
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ContainerQueryFeatureRequirements const& feature_requirements() const { return m_feature_requirements; }
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bool contains_size_feature() const { return m_feature_requirements.contains_size_feature(); }
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MatchResult evaluate(DOM::AbstractElement const&, Optional<FlyString> const& container_name) const;
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String to_string() const;
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void dump(StringBuilder&, int indent_levels = 0) const;
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private:
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explicit ContainerQuery(NonnullOwnPtr<BooleanExpression>&&);
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NonnullOwnPtr<BooleanExpression> m_condition;
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ContainerQueryFeatureRequirements m_feature_requirements;
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bool m_matches { false };
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};
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Optional<SizeFeatureID> size_feature_id_from_string(StringView);
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StringView string_from_size_feature_id(SizeFeatureID);
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bool size_feature_type_is_range(SizeFeatureID);
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bool container_name_matches(DOM::Element const&, Optional<FlyString> const& container_name);
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}
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