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LibWeb: Resolve custom properties

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The way to get the custom properties is pretty weird and this code is
as far from optimized as it gets but somehow it works :^)
This commit is contained in:
Tobias Christiansen 2021-05-24 23:02:58 +02:00 • committed by Linus Groh
parent bf9c5ffb3f
commit fd6b04055c
2 changed files with 48 additions and 1 deletions
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42
Userland/Libraries/LibWeb/CSS/StyleResolver.cpp
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@ -765,6 +765,37 @@ static void set_property_expanding_shorthands(StyleProperties& style, CSS::Prope
style.set_property(property_id, value);
}
StyleResolver::CustomPropertyResolutionTuple StyleResolver::resolve_custom_property_with_specificity(const DOM::Element& element, const String& custom_property_name) const
{
auto parent_element = element.parent_element();
CustomPropertyResolutionTuple parent_resolved {};
if (parent_element)
parent_resolved = resolve_custom_property_with_specificity(*parent_element, custom_property_name);
auto matching_rules = collect_matching_rules(element);
sort_matching_rules(matching_rules);
for (int i = matching_rules.size() - 1; i >= 0; --i) {
auto& match = matching_rules[i];
if (match.specificity < parent_resolved.specificity)
continue;
auto custom_property_style = match.rule->declaration().custom_property(custom_property_name);
if (custom_property_style.has_value()) {
return { custom_property_style.value(), match.specificity };
}
}
return parent_resolved;
}
Optional<StyleProperty> StyleResolver::resolve_custom_property(const DOM::Element& element, const String& custom_property_name) const
{
auto resolved_with_specificity = resolve_custom_property_with_specificity(element, custom_property_name);
return resolved_with_specificity.style;
}
NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const DOM::Element& element) const
{
auto style = StyleProperties::create();
@ -783,7 +814,16 @@ NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const DOM::Element&
for (auto& match : matching_rules) {
for (auto& property : match.rule->declaration().properties()) {
set_property_expanding_shorthands(style, property.property_id, property.value, m_document);
auto property_value = property.value;
if (property.value->is_custom_property()) {
auto prop = reinterpret_cast<const CSS::CustomStyleValue*>(property.value.ptr());
auto custom_prop_name = prop->custom_property_name();
auto resolved = resolve_custom_property(element, custom_prop_name);
if (resolved.has_value()) {
property_value = resolved.value().value;
}
}
set_property_expanding_shorthands(style, property.property_id, property_value, m_document);
}
}