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71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
/*
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* Copyright (c) 2021-2022, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2023, Luke Wilde <lukew@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/Function.h>
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#include <LibJS/Heap/GCPtr.h>
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#include <LibWeb/Bindings/PlatformObject.h>
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#include <LibWeb/Forward.h>
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namespace Web::DOM {
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// NOTE: HTMLCollection is in the DOM namespace because it's part of the DOM specification.
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// This class implements a live, filtered view of a DOM subtree.
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// When constructing an HTMLCollection, you provide a root node + a filter.
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// The filter is a simple Function object that answers the question
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// "is this Element part of the collection?"
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class HTMLCollection : public Bindings::PlatformObject {
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WEB_PLATFORM_OBJECT(HTMLCollection, Bindings::PlatformObject);
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JS_DECLARE_ALLOCATOR(HTMLCollection);
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public:
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enum class Scope {
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Children,
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Descendants,
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};
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[[nodiscard]] static JS::NonnullGCPtr<HTMLCollection> create(ParentNode& root, Scope, ESCAPING Function<bool(Element const&)> filter);
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virtual ~HTMLCollection() override;
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size_t length() const;
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Element* item(size_t index) const;
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Element* named_item(FlyString const& key) const;
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JS::MarkedVector<JS::NonnullGCPtr<Element>> collect_matching_elements() const;
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virtual WebIDL::ExceptionOr<JS::Value> item_value(size_t index) const override;
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virtual WebIDL::ExceptionOr<JS::Value> named_item_value(FlyString const& name) const override;
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virtual Vector<FlyString> supported_property_names() const override;
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virtual bool is_supported_property_index(u32) const override;
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protected:
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HTMLCollection(ParentNode& root, Scope, ESCAPING Function<bool(Element const&)> filter);
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virtual void initialize(JS::Realm&) override;
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JS::NonnullGCPtr<ParentNode> root() { return *m_root; }
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JS::NonnullGCPtr<ParentNode const> root() const { return *m_root; }
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private:
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virtual void visit_edges(Cell::Visitor&) override;
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void update_cache_if_needed() const;
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mutable u64 m_cached_dom_tree_version { 0 };
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mutable Vector<JS::NonnullGCPtr<Element>> m_cached_elements;
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JS::NonnullGCPtr<ParentNode> m_root;
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Function<bool(Element const&)> m_filter;
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Scope m_scope { Scope::Descendants };
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};
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}
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