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41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
/*
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* Copyright (c) 2020, Luke Wilde <lukew@serenityos.org>
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* Copyright (c) 2024, circl <circl.lastname@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/DOM/EventTarget.h>
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#include <LibWeb/DOM/Node.h>
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#include <LibWeb/DOM/ShadowRoot.h>
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#include <LibWeb/DOM/Utils.h>
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namespace Web::DOM {
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// https://dom.spec.whatwg.org/#retarget
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EventTarget* retarget(EventTarget* a, EventTarget* b)
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{
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// To retarget an object A against an object B, repeat these steps until they return an object:
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for (;;) {
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// 1. If one of the following is true then return A.
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// - A is not a node
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if (!is<Node>(a))
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return a;
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// - A’s root is not a shadow root
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auto* a_node = verify_cast<Node>(a);
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auto& a_root = a_node->root();
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if (!is<ShadowRoot>(a_root))
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return a;
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// - B is a node and A’s root is a shadow-including inclusive ancestor of B
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if (is<Node>(b) && a_root.is_shadow_including_inclusive_ancestor_of(verify_cast<Node>(*b)))
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return a;
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// 2. Set A to A’s root’s host.
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auto& a_shadow_root = verify_cast<ShadowRoot>(a_root);
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a = a_shadow_root.host();
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}
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}
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}
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