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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.
105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <andreas@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 <LibCore/Forward.h>
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#include <LibGfx/Forward.h>
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#include <LibWeb/HTML/FormAssociatedElement.h>
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#include <LibWeb/HTML/HTMLElement.h>
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#include <LibWeb/HTML/NavigableContainer.h>
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#include <LibWeb/Layout/ImageProvider.h>
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namespace Web::HTML {
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class HTMLObjectElement final
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: public NavigableContainer
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, public FormAssociatedElement
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, public Layout::ImageProvider {
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WEB_PLATFORM_OBJECT(HTMLObjectElement, NavigableContainer)
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GC_DECLARE_ALLOCATOR(HTMLObjectElement);
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FORM_ASSOCIATED_ELEMENT(NavigableContainer, HTMLObjectElement)
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enum class Representation {
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Unknown,
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Image,
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ContentNavigable,
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Children,
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};
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public:
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virtual ~HTMLObjectElement() override;
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virtual void form_associated_element_attribute_changed(FlyString const& name, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
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virtual void form_associated_element_was_removed(DOM::Node*) override;
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String data() const;
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void set_data(String const& data) { MUST(set_attribute(HTML::AttributeNames::data, data)); }
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String type() const { return get_attribute_value(HTML::AttributeNames::type); }
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// ^FormAssociatedElement
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// https://html.spec.whatwg.org/multipage/forms.html#category-listed
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virtual bool is_listed() const override { return true; }
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virtual void visit_edges(Cell::Visitor&) override;
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private:
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HTMLObjectElement(DOM::Document&, DOM::QualifiedName);
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virtual bool is_html_object_element() const override { return true; }
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virtual void initialize(JS::Realm&) override;
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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 GC::Ptr<Layout::Node> create_layout_node(GC::Ref<CSS::ComputedProperties>) override;
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virtual void adjust_computed_style(CSS::ComputedProperties&) override;
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bool has_ancestor_media_element_or_object_element_not_showing_fallback_content() const;
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void queue_element_task_to_run_object_representation_steps();
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void run_object_representation_handler_steps(Fetch::Infrastructure::Response const&, MimeSniff::MimeType const&, ReadonlyBytes);
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void run_object_representation_completed_steps(Representation);
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void run_object_representation_fallback_steps();
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void load_image();
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void update_layout_and_child_objects(Representation);
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void resource_did_load(Fetch::Infrastructure::Response const&, ReadonlyBytes);
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void resource_did_fail();
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// ^DOM::Element
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virtual i32 default_tab_index_value() const override;
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// ^Layout::ImageProvider
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virtual bool is_image_available() const override;
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virtual Optional<CSSPixels> intrinsic_width() const override;
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virtual Optional<CSSPixels> intrinsic_height() const override;
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virtual Optional<CSSPixelFraction> intrinsic_aspect_ratio() const override;
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virtual RefPtr<Gfx::ImmutableBitmap> current_image_bitmap(Gfx::IntSize = {}) const override;
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virtual void set_visible_in_viewport(bool) override;
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virtual GC::Ref<DOM::Element const> to_html_element() const override { return *this; }
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GC::Ptr<DecodedImageData> image_data() const;
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Representation m_representation { Representation::Unknown };
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GC::Ptr<SharedResourceRequest> m_resource_request;
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GC::Ptr<DOM::DocumentObserver> m_document_observer;
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Optional<DOM::DocumentLoadEventDelayer> m_document_load_event_delayer_for_object_representation_task;
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Optional<DOM::DocumentLoadEventDelayer> m_document_load_event_delayer_for_resource_load;
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};
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}
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namespace Web::DOM {
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template<>
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inline bool Node::fast_is<HTML::HTMLObjectElement>() const { return is_html_object_element(); }
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}
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