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LibWeb: Extract shared lazy-loading behavior into a base class

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`<iframe>` and `<img>` tags share the same spec for several aspects of
lazy-loading: how the `loading` attribute works, the "will lazy load
element" steps, and a member for storing the lazy-load resumption
steps. So let's share the implementation by using a base class.

This mostly involves moving things around. However, we also change the
`start_intersection_observing_a_lazy_loading_element()` method to take
a LazyLoadingElement, and operate on one, instead of always casting to
HTMLImageElement.

We do unfortunately have to do some shenanigans to make the cast work,
by adding a virtual function stub in DOM::Element.
This commit is contained in:
Sam Atkins 2023-11-21 18:50:09 +00:00 • committed by Andreas Kling
parent cc2008ea0d
commit cc633123ca
7 changed files with 111 additions and 56 deletions
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Userland/Libraries/LibWeb/DOM/Node.h
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@ -105,6 +105,7 @@ public:
virtual bool is_html_button_element() const { return false; }
virtual bool is_html_slot_element() const { return false; }
virtual bool is_navigable_container() const { return false; }
virtual bool is_lazy_loading() const { return false; }
WebIDL::ExceptionOr<JS::NonnullGCPtr<Node>> pre_insert(JS::NonnullGCPtr<Node>, JS::GCPtr<Node>);
WebIDL::ExceptionOr<JS::NonnullGCPtr<Node>> pre_remove(JS::NonnullGCPtr<Node>);