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91 lines
3.9 KiB
C++
91 lines
3.9 KiB
C++
/*
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* Copyright (c) 2021, 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 <LibJS/Heap/Handle.h>
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#include <LibWeb/Bindings/PlatformObject.h>
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#include <LibWeb/IntersectionObserver/IntersectionObserverEntry.h>
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#include <LibWeb/PixelUnits.h>
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namespace Web::IntersectionObserver {
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struct IntersectionObserverInit {
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Optional<Variant<JS::Handle<DOM::Element>, JS::Handle<DOM::Document>>> root;
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String root_margin { "0px"_string };
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Variant<double, Vector<double>> threshold { 0 };
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};
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// https://www.w3.org/TR/intersection-observer/#intersectionobserverregistration
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struct IntersectionObserverRegistration {
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserverregistration-observer
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// [A]n observer property holding an IntersectionObserver.
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JS::NonnullGCPtr<IntersectionObserver> observer;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserverregistration-observer
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// NOTE: Optional is used in place of the spec using -1 to indicate no previous index.
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// [A] previousThresholdIndex property holding a number between -1 and the length of the observer’s thresholds property (inclusive).
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Optional<size_t> previous_threshold_index;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserverregistration-previousisintersecting
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// [A] previousIsIntersecting property holding a boolean.
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bool previous_is_intersecting { false };
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};
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// https://w3c.github.io/IntersectionObserver/#intersection-observer-interface
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class IntersectionObserver final : public Bindings::PlatformObject {
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WEB_PLATFORM_OBJECT(IntersectionObserver, Bindings::PlatformObject);
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JS_DECLARE_ALLOCATOR(IntersectionObserver);
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public:
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static WebIDL::ExceptionOr<JS::NonnullGCPtr<IntersectionObserver>> construct_impl(JS::Realm&, JS::GCPtr<WebIDL::CallbackType> callback, IntersectionObserverInit const& options = {});
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virtual ~IntersectionObserver() override;
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void observe(DOM::Element& target);
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void unobserve(DOM::Element& target);
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void disconnect();
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Vector<JS::Handle<IntersectionObserverEntry>> take_records();
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Vector<JS::NonnullGCPtr<DOM::Element>> const& observation_targets() const { return m_observation_targets; }
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Variant<JS::Handle<DOM::Element>, JS::Handle<DOM::Document>, Empty> root() const;
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Vector<double> const& thresholds() const { return m_thresholds; }
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Variant<JS::Handle<DOM::Element>, JS::Handle<DOM::Document>> intersection_root() const;
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CSSPixelRect root_intersection_rectangle() const;
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void queue_entry(Badge<DOM::Document>, JS::NonnullGCPtr<IntersectionObserverEntry>);
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WebIDL::CallbackType& callback() { return *m_callback; }
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private:
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explicit IntersectionObserver(JS::Realm&, JS::GCPtr<WebIDL::CallbackType> callback, Optional<Variant<JS::Handle<DOM::Element>, JS::Handle<DOM::Document>>> const& root, Vector<double>&& thresholds);
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(JS::Cell::Visitor&) override;
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virtual void finalize() override;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-callback-slot
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JS::GCPtr<WebIDL::CallbackType> m_callback;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-root
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JS::GCPtr<DOM::Node> m_root;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-thresholds
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Vector<double> m_thresholds;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-queuedentries-slot
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Vector<JS::NonnullGCPtr<IntersectionObserverEntry>> m_queued_entries;
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// https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-observationtargets-slot
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Vector<JS::NonnullGCPtr<DOM::Element>> m_observation_targets;
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// AD-HOC: This is the document where we've registered the IntersectionObserver.
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WeakPtr<DOM::Document> m_document;
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};
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}
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