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51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
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/*
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* Copyright (c) 2024, circl <circl.lastname@gmail.com>
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* Copyright (c) 2025, Feng Yu <f3n67u@outlook.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Utils.h>
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namespace Web::DOM {
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template<typename T>
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concept DocumentOrShadowRoot = OneOf<T, Document, ShadowRoot>;
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// https://html.spec.whatwg.org/multipage/interaction.html#dom-documentorshadowroot-activeelement
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template<DocumentOrShadowRoot T>
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GC::Ptr<Element> calculate_active_element(T& self)
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{
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// 1. Let candidate be this's node document's focused area's DOM anchor.
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Node* candidate = self.document().focused_area();
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// 2. Set candidate to the result of retargeting candidate against this.
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candidate = as<Node>(retarget(candidate, &self));
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// 3. If candidate's root is not this, then return null.
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if (&candidate->root() != &self)
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return nullptr;
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// 4. If candidate is not a Document object, then return candidate.
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if (!is<Document>(candidate))
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return as<Element>(candidate);
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auto* candidate_document = as_if<Document>(candidate);
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// 5. If candidate has a body element, then return that body element.
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if (auto* body = candidate_document->body())
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return body;
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// 6. If candidate's document element is non-null, then return that document element.
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if (auto* document_element = candidate_document->document_element())
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return document_element;
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// 7. Return null.
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return nullptr;
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}
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}
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