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b981e6f7bc
Many times, attribute mutation doesn't necessitate a full style invalidation on the element. However, the conditions are pretty elaborate, so this first version has a lot of false positives. We only need to invalidate style when any of these things apply: 1. The change may affect the match state of a selector somewhere. 2. The change may affect presentational hints applied to the element. For (1) in this first version, we have a fixed list of attribute names that may affect selectors. We also collect all names referenced by attribute selectors anywhere in the document. For (2), we add a new Element::is_presentational_hint() virtual that tells us whether a given attribute name is a presentational hint. This drastically reduces style work on many websites. As an example, https://cnn.com/ is once again browseable.
51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
/*
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* Copyright (c) 2023, Preston Taylor <95388976+PrestonLTaylor@users.noreply.github.com>
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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 <LibWeb/SVG/SVGGraphicsElement.h>
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#include <LibWeb/SVG/SVGViewport.h>
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namespace Web::SVG {
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class SVGSymbolElement final : public SVGGraphicsElement
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, public SVGViewport {
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WEB_PLATFORM_OBJECT(SVGSymbolElement, SVGGraphicsElement);
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GC_DECLARE_ALLOCATOR(SVGSymbolElement);
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public:
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virtual ~SVGSymbolElement() override = default;
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virtual bool is_presentational_hint(FlyString const&) const override;
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virtual void apply_presentational_hints(GC::Ref<CSS::CascadedProperties>) const override;
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virtual Optional<ViewBox> view_box() const override { return m_view_box; }
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virtual Optional<PreserveAspectRatio> preserve_aspect_ratio() const override
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{
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// FIXME: Support the `preserveAspectRatio` attribute on <symbol>.
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return {};
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}
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GC::Ref<SVGAnimatedRect> view_box_for_bindings() { return *m_view_box_for_bindings; }
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private:
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SVGSymbolElement(DOM::Document&, DOM::QualifiedName);
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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 GC::Ptr<Layout::Node> create_layout_node(GC::Ref<CSS::ComputedProperties>) override;
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bool is_direct_child_of_use_shadow_tree() const;
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virtual void attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
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Optional<ViewBox> m_view_box;
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GC::Ptr<SVGAnimatedRect> m_view_box_for_bindings;
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};
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}
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