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LibWeb: Implement stub for ElementInternals

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This implements a stub ElementInternals object which implements the
shadowRoot getter only.

Also implement attachInternals function.
This commit is contained in:
Luke Warlow
2024-06-24 21:54:42 +01:00
committed by Andreas Kling
parent ce8d3d17c4
commit a65f1ecc37
13 changed files with 193 additions and 1 deletions
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37
Userland/Libraries/LibWeb/HTML/HTMLElement.cpp
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@@ -13,7 +13,9 @@
#include <LibWeb/DOM/LiveNodeList.h>
#include <LibWeb/DOM/ShadowRoot.h>
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/HTML/CustomElements/CustomElementDefinition.h>
#include <LibWeb/HTML/DOMStringMap.h>
#include <LibWeb/HTML/ElementInternals.h>
#include <LibWeb/HTML/EventHandler.h>
#include <LibWeb/HTML/Focus.h>
#include <LibWeb/HTML/HTMLAnchorElement.h>
@@ -60,6 +62,7 @@ void HTMLElement::visit_edges(Cell::Visitor& visitor)
Base::visit_edges(visitor);
visitor.visit(m_dataset);
visitor.visit(m_labels);
visitor.visit(m_attached_internals);
}
JS::NonnullGCPtr<DOMStringMap> HTMLElement::dataset()
@@ -608,6 +611,40 @@ TokenizedFeature::NoOpener HTMLElement::get_an_elements_noopener(StringView targ
return TokenizedFeature::NoOpener::No;
}
WebIDL::ExceptionOr<JS::NonnullGCPtr<ElementInternals>> HTMLElement::attach_internals()
{
// 1. If this's is value is not null, then throw a "NotSupportedError" DOMException.
if (is_value().has_value())
return WebIDL::NotSupportedError::create(realm(), "ElementInternals cannot be attached to a customized build-in element"_fly_string);
// 2. Let definition be the result of looking up a custom element definition given this's node document, its namespace, its local name, and null as the is value.
auto definition = document().lookup_custom_element_definition(namespace_uri(), local_name(), is_value());
// 3. If definition is null, then throw an "NotSupportedError" DOMException.
if (!definition)
return WebIDL::NotSupportedError::create(realm(), "ElementInternals cannot be attached to an element that is not a custom element"_fly_string);
// 4. If definition's disable internals is true, then throw a "NotSupportedError" DOMException.
if (definition->disable_internals())
return WebIDL::NotSupportedError::create(realm(), "ElementInternals are disabled for this custom element"_fly_string);
// 5. If this's attached internals is non-null, then throw an "NotSupportedError" DOMException.
if (m_attached_internals)
return WebIDL::NotSupportedError::create(realm(), "ElementInternals already attached"_fly_string);
// 6. If this's custom element state is not "precustomized" or "custom", then throw a "NotSupportedError" DOMException.
if (!first_is_one_of(custom_element_state(), DOM::CustomElementState::Precustomized, DOM::CustomElementState::Custom))
return WebIDL::NotSupportedError::create(realm(), "Custom element is in an invalid state to attach ElementInternals"_fly_string);
// 7. Set this's attached internals to a new ElementInternals instance whose target element is this.
auto internals = ElementInternals::create(realm(), *this);
m_attached_internals = internals;
// 8. Return this's attached internals.
return { internals };
}
void HTMLElement::did_receive_focus()
{
if (m_content_editable_state != ContentEditableState::True)