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LibWeb: Implement the attribute-change-steps extension

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This is similar to the run activation behavior in that elements may
define these steps themselves. HTMLSlotElement is one such element. The
existing (ad-hoc) Element::attribute_changed() method is not sufficient
there as the steps require knowledge of the attribute's old value and
its namespace, which this extension provides.

Unlike the run activation behavior, we store these steps in a list. An
element may end up defining multiple attribute change steps. For example
all DOM elements must define steps to handle the "slot" attribute, and
HTMLSlotElement must define steps to handle the "name" attribute.
This commit is contained in:
Timothy Flynn 2023-09-01 17:45:22 -04:00 • committed by Andreas Kling
parent 54b5a431a3
commit b85a252753
2 changed files with 13 additions and 3 deletions
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11
Userland/Libraries/LibWeb/DOM/Element.cpp
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@ -409,10 +409,15 @@ CSS::CSSStyleDeclaration const* Element::inline_style() const
return m_inline_style.ptr();
}
void Element::run_attribute_change_steps(DeprecatedFlyString const& local_name, DeprecatedString const&, DeprecatedString const& value, DeprecatedFlyString const&)
void Element::add_attribute_change_steps(AttributeChangeSteps steps)
{
// FIXME: Implement the element's attribute change steps:
// https://dom.spec.whatwg.org/#concept-element-attributes-change-ext
m_attribute_change_steps.append(move(steps));
}
void Element::run_attribute_change_steps(DeprecatedFlyString const& local_name, DeprecatedString const& old_value, DeprecatedString const& value, DeprecatedFlyString const& namespace_)
{
for (auto const& attribute_change_steps : m_attribute_change_steps)
attribute_change_steps(local_name, old_value, value, namespace_);
// AD-HOC: Run our own internal attribute change handler.
attribute_changed(local_name, value);