LibWeb: Sketch out basic support for SVG <foreignObject> elements

This patch adds basic DOM construction and IDL bindings for foreign
objects in SVG trees.

1 files changed, 81 insertions, 0 deletions

diff --git a/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.cpp
new file mode 100644
index 0000000000..75bd7a2c00
--- /dev/null
+++ b/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.cpp
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/HTML/Parser/HTMLParser.h>
+#include <LibWeb/Layout/BlockContainer.h>
+#include <LibWeb/SVG/AttributeNames.h>
+#include <LibWeb/SVG/SVGAnimatedLength.h>
+#include <LibWeb/SVG/SVGForeignObjectElement.h>
+#include <LibWeb/SVG/SVGLength.h>
+
+namespace Web::SVG {
+
+SVGForeignObjectElement::SVGForeignObjectElement(DOM::Document& document, DOM::QualifiedName qualified_name)
+    : SVGGraphicsElement(document, move(qualified_name))
+{
+    set_prototype(&Bindings::cached_web_prototype(realm(), "SVGForeignObjectElement"));
+}
+
+SVGForeignObjectElement::~SVGForeignObjectElement() = default;
+
+void SVGForeignObjectElement::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+
+    // FIXME: These never actually get updated!
+    m_x = SVGAnimatedLength::create(realm, SVGLength::create(realm, 0, 0), SVGLength::create(realm, 0, 0));
+    m_y = SVGAnimatedLength::create(realm, SVGLength::create(realm, 0, 0), SVGLength::create(realm, 0, 0));
+    m_width = SVGAnimatedLength::create(realm, SVGLength::create(realm, 0, 0), SVGLength::create(realm, 0, 0));
+    m_height = SVGAnimatedLength::create(realm, SVGLength::create(realm, 0, 0), SVGLength::create(realm, 0, 0));
+}
+
+void SVGForeignObjectElement::visit_edges(Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_x);
+    visitor.visit(m_y);
+    visitor.visit(m_width);
+    visitor.visit(m_height);
+}
+
+JS::GCPtr<Layout::Node> SVGForeignObjectElement::create_layout_node(NonnullRefPtr<CSS::StyleProperties> style)
+{
+    return heap().allocate_without_realm<Layout::BlockContainer>(document(), this, move(style));
+}
+
+void SVGForeignObjectElement::apply_presentational_hints(CSS::StyleProperties& style) const
+{
+    Base::apply_presentational_hints(style);
+
+    if (auto width_value = HTML::parse_dimension_value(attribute(SVG::AttributeNames::width)))
+        style.set_property(CSS::PropertyID::Width, width_value.release_nonnull());
+
+    if (auto height_value = HTML::parse_dimension_value(attribute(SVG::AttributeNames::height)))
+        style.set_property(CSS::PropertyID::Height, height_value.release_nonnull());
+}
+
+JS::NonnullGCPtr<SVG::SVGAnimatedLength> SVGForeignObjectElement::x()
+{
+    return *m_x;
+}
+
+JS::NonnullGCPtr<SVG::SVGAnimatedLength> SVGForeignObjectElement::y()
+{
+    return *m_y;
+}
+
+JS::NonnullGCPtr<SVG::SVGAnimatedLength> SVGForeignObjectElement::width()
+{
+    return *m_width;
+}
+
+JS::NonnullGCPtr<SVG::SVGAnimatedLength> SVGForeignObjectElement::height()
+{
+    return *m_height;
+}
+
+}