ladybird/Userland/Libraries/LibWeb/SVG/SVGElement.cpp

/*
 * Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
 * Copyright (c) 2023, Preston Taylor <95388976+PrestonLTaylor@users.noreply.github.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/ShadowRoot.h>
#include <LibWeb/HTML/DOMStringMap.h>
#include <LibWeb/SVG/SVGElement.h>
#include <LibWeb/SVG/SVGUseElement.h>

namespace Web::SVG {

SVGElement::SVGElement(DOM::Document& document, DOM::QualifiedName qualified_name)
    : Element(document, move(qualified_name))
{
}

JS::ThrowCompletionOr<void> SVGElement::initialize(JS::Realm& realm)
{
    MUST_OR_THROW_OOM(Base::initialize(realm));
    set_prototype(&Bindings::ensure_web_prototype<Bindings::SVGElementPrototype>(realm, "SVGElement"));

    m_dataset = TRY(Bindings::throw_dom_exception_if_needed(realm.vm(), [&]() {
        return HTML::DOMStringMap::create(*this);
    }));

    return {};
}

void SVGElement::visit_edges(Cell::Visitor& visitor)
{
    Base::visit_edges(visitor);
    visitor.visit(m_dataset);
}

void SVGElement::attribute_changed(DeprecatedFlyString const& name, DeprecatedString const& value)
{
    Base::attribute_changed(name, value);

    update_use_elements_that_reference_this();
}

void SVGElement::inserted()
{
    Base::inserted();

    update_use_elements_that_reference_this();
}

void SVGElement::children_changed()
{
    Base::children_changed();

    update_use_elements_that_reference_this();
}

void SVGElement::update_use_elements_that_reference_this()
{
    if (is<SVGUseElement>(this)
        // If this element is in a shadow root, it already represents a clone and is not itself referenced.
        || is<DOM::ShadowRoot>(this->root())
        // If this does not have an id it cannot be referenced, no point in searching the entire DOM tree.
        || !this->has_attribute(HTML::AttributeNames::id)
        // An unconnected node cannot have valid references.
        // This also prevents searches for elements that are in the process of being constructed - as clones.
        || !this->is_connected()
        // Each use element already listens for the completely_loaded event and then clones its referece,
        // we do not have to also clone it in the process of initial DOM building.
        || !document().is_completely_loaded()) {

        return;
    }

    document().for_each_in_subtree_of_type<SVGUseElement>([this](SVGUseElement& use_element) {
        use_element.svg_element_changed(*this);
        return IterationDecision::Continue;
    });
}

void SVGElement::removed_from(Node* parent)
{
    Base::removed_from(parent);

    remove_from_use_element_that_reference_this();
}

void SVGElement::remove_from_use_element_that_reference_this()
{
    if (is<SVGUseElement>(this) || !this->has_attribute(HTML::AttributeNames::id)) {
        return;
    }

    document().for_each_in_subtree_of_type<SVGUseElement>([this](SVGUseElement& use_element) {
        use_element.svg_element_removed(*this);
        return IterationDecision::Continue;
    });
}

}