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LibWeb: Obtain theme-color on meta element removal and modification

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Gingeh 2025-01-04 09:59:57 +11:00 • committed by Sam Atkins
commit 4a0ac312cc
Notes: github-actions[bot] 2025-01-08 11:19:28 +00:00
3 changed files with 55 additions and 35 deletions
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47
Libraries/LibWeb/DOM/Document.cpp
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@ -1471,6 +1471,53 @@ void Document::obtain_supported_color_schemes()
// 3. Return null.
}
// https://html.spec.whatwg.org/multipage/semantics.html#meta-theme-color
void Document::obtain_theme_color()
{
Color theme_color = Color::Transparent;
// 1. Let candidate elements be the list of all meta elements that meet the following criteria, in tree order:
for_each_in_subtree_of_type<HTML::HTMLMetaElement>([&](HTML::HTMLMetaElement& element) {
// * the element is in a document tree;
// * the element has a name attribute, whose value is an ASCII case-insensitive match for theme-color; and
// * the element has a content attribute.
// 2. For each element in candidate elements:
auto content = element.attribute(HTML::AttributeNames::content);
if (element.name().has_value() && element.name()->equals_ignoring_ascii_case("theme-color"sv) && content.has_value()) {
// 1. If element has a media attribute and the value of element's media attribute does not match the environment, then continue.
auto context = CSS::Parser::ParsingContext { document() };
auto media = element.attribute(HTML::AttributeNames::media);
if (media.has_value()) {
auto query = parse_media_query(context, media.value());
if (window() && !query->evaluate(*window()))
return TraversalDecision::Continue;
}
// 2. Let value be the result of stripping leading and trailing ASCII whitespace from the value of element's content attribute.
auto value = content->bytes_as_string_view().trim(Infra::ASCII_WHITESPACE);
// 3. Let color be the result of parsing value.
auto css_value = parse_css_value(context, value, CSS::PropertyID::Color);
// 4. If color is not failure, then return color.
if (!css_value.is_null() && css_value->is_color()) {
Optional<Layout::NodeWithStyle const&> root_node;
if (html_element())
root_node = *html_element()->layout_node();
theme_color = css_value->to_color(root_node);
return TraversalDecision::Break;
}
}
return TraversalDecision::Continue;
});
// 3. Return nothing(the page has no theme color).
document().page().client().page_did_change_theme_color(theme_color);
}
Layout::Viewport const* Document::layout_node() const
{
return static_cast<Layout::Viewport const*>(Node::layout_node());