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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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21
Userland/Libraries/LibWeb/DOM/Element.cpp
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@ -1784,4 +1784,25 @@ bool Element::id_reference_exists(DeprecatedString const& id_reference) const
return document().get_element_by_id(id_reference);
}
void Element::register_intersection_observer(Badge<IntersectionObserver::IntersectionObserver>, IntersectionObserver::IntersectionObserverRegistration registration)
{
m_registered_intersection_observers.append(move(registration));
}
void Element::unregister_intersection_observer(Badge<IntersectionObserver::IntersectionObserver>, JS::NonnullGCPtr<IntersectionObserver::IntersectionObserver> observer)
{
m_registered_intersection_observers.remove_first_matching([&observer](IntersectionObserver::IntersectionObserverRegistration const& entry) {
return entry.observer == observer;
});
}
IntersectionObserver::IntersectionObserverRegistration& Element::get_intersection_observer_registration(Badge<DOM::Document>, IntersectionObserver::IntersectionObserver const& observer)
{
auto registration_iterator = m_registered_intersection_observers.find_if([&observer](IntersectionObserver::IntersectionObserverRegistration const& entry) {
return entry.observer.ptr() == &observer;
});
VERIFY(!registration_iterator.is_end());
return *registration_iterator;
}
}