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LibWeb: Add Angle::from_style_value

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This method takes a `AngleStyleValue`, `PercentageStyleValue` or
fully-simplified `CalculatedStyleValue` with a numeric type of angle, as
well as a percentage basis and produces the equivalent `Angle` value.

This saves us having to reimplement this logic in multiple places
This commit is contained in:
Callum Law 2025-11-18 21:10:26 +13:00 • committed by Jelle Raaijmakers
parent 2f0cd9f739
commit b262902b02
Notes: github-actions[bot] 2025-11-23 08:45:00 +00:00
2 changed files with 27 additions and 0 deletions
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26
Libraries/LibWeb/CSS/Angle.cpp
View file

@ -8,7 +8,9 @@
#include <LibWeb/CSS/Angle.h>
#include <LibWeb/CSS/Percentage.h>
#include <LibWeb/CSS/Serialize.h>
#include <LibWeb/CSS/StyleValues/AngleStyleValue.h>
#include <LibWeb/CSS/StyleValues/CalculatedStyleValue.h>
#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
namespace Web::CSS {
@ -56,6 +58,30 @@ double Angle::to_radians() const
return ratio_between_units(m_unit, AngleUnit::Rad) * m_value;
}
Angle Angle::from_style_value(NonnullRefPtr<StyleValue const> const& style_value, Optional<Angle> percentage_basis)
{
if (style_value->is_angle())
return style_value->as_angle().angle();
if (style_value->is_calculated()) {
CalculationResolutionContext::PercentageBasis resolved_percentage_basis;
if (percentage_basis.has_value()) {
resolved_percentage_basis = percentage_basis.value();
}
return style_value->as_calculated().resolve_angle({ .percentage_basis = resolved_percentage_basis }).value();
}
if (style_value->is_percentage()) {
VERIFY(percentage_basis.has_value());
return percentage_basis.value().percentage_of(style_value->as_percentage().percentage());
}
VERIFY_NOT_REACHED();
}
Angle Angle::resolve_calculated(NonnullRefPtr<CalculatedStyleValue const> const& calculated, Layout::Node const& layout_node, Angle const& reference_value)
{
CalculationResolutionContext context {

1
Libraries/LibWeb/CSS/Angle.h
View file

@ -45,6 +45,7 @@ public:
return 0;
}
static Angle from_style_value(NonnullRefPtr<StyleValue const> const&, Optional<Angle> percentage_basis);
static Angle resolve_calculated(NonnullRefPtr<CalculatedStyleValue const> const&, Layout::Node const&, Angle const& reference_value);
private: