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- /*
- * Copyright (c) 2023, Preston Taylor <95388976+PrestonLTaylor@users.noreply.github.com>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <LibWeb/Bindings/Intrinsics.h>
- #include <LibWeb/DOM/Document.h>
- #include <LibWeb/DOM/ElementFactory.h>
- #include <LibWeb/DOM/Event.h>
- #include <LibWeb/DOM/ShadowRoot.h>
- #include <LibWeb/Layout/Box.h>
- #include <LibWeb/Namespace.h>
- #include <LibWeb/SVG/AttributeNames.h>
- #include <LibWeb/SVG/SVGSVGElement.h>
- #include <LibWeb/SVG/SVGUseElement.h>
- namespace Web::SVG {
- SVGUseElement::SVGUseElement(DOM::Document& document, DOM::QualifiedName qualified_name)
- : SVGGraphicsElement(document, qualified_name)
- {
- }
- void SVGUseElement::initialize(JS::Realm& realm)
- {
- Base::initialize(realm);
- set_prototype(&Bindings::ensure_web_prototype<Bindings::SVGUseElementPrototype>(realm, "SVGUseElement"));
- // The shadow tree is open (inspectable by script), but read-only.
- auto shadow_root = heap().allocate<DOM::ShadowRoot>(realm, document(), *this, Bindings::ShadowRootMode::Open);
- // The user agent must create a use-element shadow tree whose host is the ‘use’ element itself
- set_shadow_root(shadow_root);
- m_document_observer = realm.heap().allocate<DOM::DocumentObserver>(realm, realm, document());
- m_document_observer->set_document_completely_loaded([this]() {
- clone_element_tree_as_our_shadow_tree(referenced_element());
- });
- }
- void SVGUseElement::visit_edges(Cell::Visitor& visitor)
- {
- Base::visit_edges(visitor);
- visitor.visit(m_document_observer);
- }
- void SVGUseElement::attribute_changed(DeprecatedFlyString const& name, DeprecatedString const& value)
- {
- Base::attribute_changed(name, value);
- // https://svgwg.org/svg2-draft/struct.html#UseLayout
- if (name == SVG::AttributeNames::x) {
- m_x = AttributeParser::parse_coordinate(value);
- } else if (name == SVG::AttributeNames::y) {
- m_y = AttributeParser::parse_coordinate(value);
- } else if (name == SVG::AttributeNames::href) {
- // FIXME: Support the xlink:href attribute as a fallback
- m_referenced_id = parse_id_from_href(value);
- clone_element_tree_as_our_shadow_tree(referenced_element());
- }
- }
- Optional<StringView> SVGUseElement::parse_id_from_href(DeprecatedString const& href)
- {
- auto id_seperator = href.find('#');
- if (!id_seperator.has_value()) {
- return {};
- }
- return href.substring_view(id_seperator.value() + 1);
- }
- Gfx::AffineTransform SVGUseElement::element_transform() const
- {
- // The x and y properties define an additional transformation (translate(x,y), where x and y represent the computed value of the corresponding property)
- // to be applied to the ‘use’ element, after any transformations specified with other properties
- return Base::element_transform().translate(m_x.value_or(0), m_y.value_or(0));
- }
- void SVGUseElement::inserted()
- {
- Base::inserted();
- }
- void SVGUseElement::svg_element_changed(SVGElement& svg_element)
- {
- auto to_clone = referenced_element();
- if (!to_clone) {
- return;
- }
- // NOTE: We need to check the ancestor because attribute_changed of a child doesn't call children_changed on the parent(s)
- if (to_clone == &svg_element || to_clone->is_ancestor_of(svg_element)) {
- clone_element_tree_as_our_shadow_tree(to_clone);
- }
- }
- void SVGUseElement::svg_element_removed(SVGElement& svg_element)
- {
- if (!m_referenced_id.has_value()) {
- return;
- }
- if (svg_element.deprecated_attribute("id"sv).matches(m_referenced_id.value())) {
- shadow_root()->remove_all_children();
- }
- }
- JS::GCPtr<DOM::Element> SVGUseElement::referenced_element()
- {
- if (!m_referenced_id.has_value()) {
- return nullptr;
- }
- // FIXME: Support loading of external svg documents
- return document().get_element_by_id(m_referenced_id.value());
- }
- // https://svgwg.org/svg2-draft/struct.html#UseShadowTree
- void SVGUseElement::clone_element_tree_as_our_shadow_tree(Element* to_clone) const
- {
- shadow_root()->remove_all_children();
- if (to_clone && is_valid_reference_element(to_clone)) {
- // The ‘use’ element references another element, a copy of which is rendered in place of the ‘use’ in the document.
- auto cloned_reference_node = to_clone->clone_node(nullptr, true);
- shadow_root()->append_child(cloned_reference_node).release_value_but_fixme_should_propagate_errors();
- }
- }
- bool SVGUseElement::is_valid_reference_element(Element* reference_element) const
- {
- // If the referenced element that results from resolving the URL is not an SVG element, then the reference is invalid and the ‘use’ element is in error.
- // If the referenced element is a (shadow-including) ancestor of the ‘use’ element, then this is an invalid circular reference and the ‘use’ element is in error.
- return reference_element->is_svg_element() && !reference_element->is_ancestor_of(*this);
- }
- // https://www.w3.org/TR/SVG11/shapes.html#RectElementXAttribute
- JS::NonnullGCPtr<SVGAnimatedLength> SVGUseElement::x() const
- {
- // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
- // FIXME: Create a proper animated value when animations are supported.
- auto base_length = SVGLength::create(realm(), 0, m_x.value_or(0));
- auto anim_length = SVGLength::create(realm(), 0, m_x.value_or(0));
- return SVGAnimatedLength::create(realm(), move(base_length), move(anim_length));
- }
- // https://www.w3.org/TR/SVG11/shapes.html#RectElementYAttribute
- JS::NonnullGCPtr<SVGAnimatedLength> SVGUseElement::y() const
- {
- // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
- // FIXME: Create a proper animated value when animations are supported.
- auto base_length = SVGLength::create(realm(), 0, m_y.value_or(0));
- auto anim_length = SVGLength::create(realm(), 0, m_y.value_or(0));
- return SVGAnimatedLength::create(realm(), move(base_length), move(anim_length));
- }
- JS::NonnullGCPtr<SVGAnimatedLength> SVGUseElement::width() const
- {
- TODO();
- }
- JS::NonnullGCPtr<SVGAnimatedLength> SVGUseElement::height() const
- {
- TODO();
- }
- // https://svgwg.org/svg2-draft/struct.html#TermInstanceRoot
- JS::GCPtr<SVGElement> SVGUseElement::instance_root() const
- {
- return shadow_root()->first_child_of_type<SVGElement>();
- }
- JS::GCPtr<SVGElement> SVGUseElement::animated_instance_root() const
- {
- return instance_root();
- }
- JS::GCPtr<Layout::Node> SVGUseElement::create_layout_node(NonnullRefPtr<CSS::StyleProperties> style)
- {
- return heap().allocate_without_realm<Layout::Box>(document(), this, move(style));
- }
- }
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