131 lines
4.7 KiB
C++
131 lines
4.7 KiB
C++
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(INTERSECTION_OBSERVER)
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#include "GCReachableRef.h"
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#include "IntersectionObserverCallback.h"
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#include "IntersectionObserverEntry.h"
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#include "LengthBox.h"
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#include <wtf/RefCounted.h>
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#include <wtf/Variant.h>
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#include <wtf/WeakPtr.h>
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#include <wtf/text/WTFString.h>
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namespace JSC {
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class AbstractSlotVisitor;
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}
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namespace WebCore {
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class Document;
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class Element;
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class ContainerNode;
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struct IntersectionObserverRegistration {
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WeakPtr<IntersectionObserver> observer;
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std::optional<size_t> previousThresholdIndex;
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};
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struct IntersectionObserverData {
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WTF_MAKE_STRUCT_FAST_ALLOCATED;
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// IntersectionObservers for which the node that owns this IntersectionObserverData is the root.
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// An IntersectionObserver is only owned by a JavaScript wrapper. ActiveDOMObject::virtualHasPendingActivity
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// is overridden to keep this wrapper alive while the observer has ongoing observations.
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Vector<WeakPtr<IntersectionObserver>> observers;
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// IntersectionObserverRegistrations for which the node that owns this IntersectionObserverData is the target.
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Vector<IntersectionObserverRegistration> registrations;
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};
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class IntersectionObserver : public RefCounted<IntersectionObserver>, public CanMakeWeakPtr<IntersectionObserver> {
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public:
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struct Init {
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std::optional<Variant<RefPtr<Element>, RefPtr<Document>>> root;
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String rootMargin;
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Variant<double, Vector<double>> threshold;
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};
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static ExceptionOr<Ref<IntersectionObserver>> create(Document&, Ref<IntersectionObserverCallback>&&, Init&&);
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~IntersectionObserver();
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Document* trackingDocument() const { return m_root ? &m_root->document() : m_implicitRootDocument.get(); }
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ContainerNode* root() const { return m_root.get(); }
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String rootMargin() const;
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const LengthBox& rootMarginBox() const { return m_rootMargin; }
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const Vector<double>& thresholds() const { return m_thresholds; }
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const Vector<WeakPtr<Element>>& observationTargets() const { return m_observationTargets; }
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bool hasObservationTargets() const { return m_observationTargets.size(); }
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bool isObserving(const Element&) const;
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void observe(Element&);
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void unobserve(Element&);
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void disconnect();
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struct TakenRecords {
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Vector<Ref<IntersectionObserverEntry>> records;
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Vector<GCReachableRef<Element>> pendingTargets;
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};
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TakenRecords takeRecords();
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void targetDestroyed(Element&);
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void rootDestroyed();
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std::optional<ReducedResolutionSeconds> nowTimestamp() const;
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void appendQueuedEntry(Ref<IntersectionObserverEntry>&&);
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void notify();
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IntersectionObserverCallback* callbackConcurrently() { return m_callback.get(); }
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bool isReachableFromOpaqueRoots(JSC::AbstractSlotVisitor&) const;
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private:
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IntersectionObserver(Document&, Ref<IntersectionObserverCallback>&&, ContainerNode* root, LengthBox&& parsedRootMargin, Vector<double>&& thresholds);
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bool removeTargetRegistration(Element&);
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void removeAllTargets();
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WeakPtr<Document> m_implicitRootDocument;
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WeakPtr<ContainerNode> m_root;
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LengthBox m_rootMargin;
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Vector<double> m_thresholds;
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RefPtr<IntersectionObserverCallback> m_callback;
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Vector<WeakPtr<Element>> m_observationTargets;
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Vector<GCReachableRef<Element>> m_pendingTargets;
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Vector<Ref<IntersectionObserverEntry>> m_queuedEntries;
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};
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} // namespace WebCore
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#endif // ENABLE(INTERSECTION_OBSERVER)
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