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LibWeb: Introduce the slottable concept for DOM elements and text nodes
A slottable is either a DOM element or a DOM text node. They may be assigned to slots (HTMLSlotElement) either automatically or manually. Automatic assignment occurs by matching a slot's `name` attribute to a slottable's `slot` attribute. Manual assignment occurs by using the slot's (not yet implemented) `assign` API. This commit does not perform the above assignments. It just sets up the slottable concept via IDL and hooks the slottable mixin into the element and text nodes.
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Userland/Libraries/LibWeb/DOM/Slottable.h
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Userland/Libraries/LibWeb/DOM/Slottable.h
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/*
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* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
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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 <AK/String.h>
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#include <AK/Variant.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibJS/Heap/GCPtr.h>
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#include <LibWeb/Forward.h>
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namespace Web::DOM {
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// https://dom.spec.whatwg.org/#concept-slotable
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using Slottable = Variant<JS::NonnullGCPtr<Element>, JS::NonnullGCPtr<Text>>;
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// https://dom.spec.whatwg.org/#mixin-slotable
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class SlottableMixin {
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public:
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virtual ~SlottableMixin();
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String const& slottable_name() const { return m_name; } // Not called `name` to distinguish from `Element::name`.
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void set_slottable_name(String name) { m_name = move(name); }
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JS::GCPtr<HTML::HTMLSlotElement> assigned_slot();
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JS::GCPtr<HTML::HTMLSlotElement> assigned_slot_internal() const { return m_assigned_slot; }
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void set_assigned_slot(JS::GCPtr<HTML::HTMLSlotElement> assigned_slot) { m_assigned_slot = assigned_slot; }
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JS::GCPtr<HTML::HTMLSlotElement> manual_slot_assignment() { return m_manual_slot_assignment; }
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void set_manual_slot_assignment(JS::GCPtr<HTML::HTMLSlotElement> manual_slot_assignment) { m_manual_slot_assignment = manual_slot_assignment; }
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protected:
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void visit_edges(JS::Cell::Visitor&);
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private:
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// https://dom.spec.whatwg.org/#slotable-name
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String m_name;
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// https://dom.spec.whatwg.org/#slotable-assigned-slot
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JS::GCPtr<HTML::HTMLSlotElement> m_assigned_slot;
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// https://dom.spec.whatwg.org/#slottable-manual-slot-assignment
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JS::GCPtr<HTML::HTMLSlotElement> m_manual_slot_assignment;
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};
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}
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