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LibWeb: Add initial implementation of IntersectionObserver

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The main missing features are rootMargin, proper nested browsing
context support and content clip/clip-path support.

This makes images appear on some sites, such as YouTube and
howstuffworks.com.
This commit is contained in:
Luke Wilde 2023-07-06 23:44:07 +01:00 • committed by Andreas Kling
parent 6f8afd8cd9
commit 165abafb80
16 changed files with 664 additions and 22 deletions
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9
Userland/Libraries/LibWeb/DOM/Element.h
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@ -22,6 +22,7 @@
#include <LibWeb/HTML/ScrollOptions.h>
#include <LibWeb/HTML/TagNames.h>
#include <LibWeb/HTML/Window.h>
#include <LibWeb/IntersectionObserver/IntersectionObserver.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
namespace Web::DOM {
@ -309,6 +310,10 @@ public:
void scroll(HTML::ScrollToOptions const&);
void scroll(double x, double y);
void register_intersection_observer(Badge<IntersectionObserver::IntersectionObserver>, IntersectionObserver::IntersectionObserverRegistration);
void unregister_intersection_observer(Badge<IntersectionObserver::IntersectionObserver>, JS::NonnullGCPtr<IntersectionObserver::IntersectionObserver>);
IntersectionObserver::IntersectionObserverRegistration& get_intersection_observer_registration(Badge<DOM::Document>, IntersectionObserver::IntersectionObserver const&);
protected:
Element(Document&, DOM::QualifiedName);
virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
@ -358,6 +363,10 @@ private:
// https://dom.spec.whatwg.org/#concept-element-is-value
Optional<String> m_is_value;
// https://www.w3.org/TR/intersection-observer/#dom-element-registeredintersectionobservers-slot
// Element objects have an internal [[RegisteredIntersectionObservers]] slot, which is initialized to an empty list.
Vector<IntersectionObserver::IntersectionObserverRegistration> m_registered_intersection_observers;
};
template<>