LibWeb: Implement the SVGGeometryElement.pathLength attribute

Author: https://github.com/tcl3
Commit: caf45f2317
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5410
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWeb/SVG/SVGGeometryElement.cpp

@@ -22,6 +22,12 @@ void SVGGeometryElement::initialize(JS::Realm& realm)
     Base::initialize(realm);
 }
 
+void SVGGeometryElement::visit_edges(Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_path_length);
+}
+
 GC::Ptr<Layout::Node> SVGGeometryElement::create_layout_node(GC::Ref<CSS::ComputedProperties> style)
 {
     return heap().allocate<Layout::SVGGeometryBox>(document(), *this, move(style));
@@ -38,4 +44,11 @@ GC::Ref<Geometry::DOMPoint> SVGGeometryElement::get_point_at_length(float distan
     return Geometry::DOMPoint::construct_impl(realm(), 0, 0, 0, 0);
 }
 
+GC::Ref<SVGAnimatedNumber> SVGGeometryElement::path_length()
+{
+    if (!m_path_length)
+        m_path_length = SVGAnimatedNumber::create(realm(), *this, AttributeNames::pathLength, 0.f);
+    return *m_path_length;
+}
+
 }

Libraries/LibWeb/SVG/SVGGeometryElement.h

@@ -23,10 +23,16 @@ public:
     float get_total_length();
     GC::Ref<Geometry::DOMPoint> get_point_at_length(float distance);
 
+    GC::Ref<SVGAnimatedNumber> path_length();
+
 protected:
     SVGGeometryElement(DOM::Document& document, DOM::QualifiedName qualified_name);
 
     virtual void initialize(JS::Realm&) override;
+    virtual void visit_edges(Cell::Visitor&) override;
+
+private:
+    GC::Ptr<SVGAnimatedNumber> m_path_length;
 };
 
 }

Libraries/LibWeb/SVG/SVGGeometryElement.idl

@@ -5,7 +5,7 @@
 // https://svgwg.org/svg2-draft/types.html#InterfaceSVGGeometryElement
 [Exposed=Window]
 interface SVGGeometryElement : SVGGraphicsElement {
-    [FIXME, SameObject] readonly attribute SVGAnimatedNumber pathLength;
+    [SameObject] readonly attribute SVGAnimatedNumber pathLength;
 
     [FIXME] boolean isPointInFill(optional DOMPointInit point = {});
     [FIXME] boolean isPointInStroke(optional DOMPointInit point = {});