/* * Copyright (C) 2016 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ #pragma once #if ENABLE(INTERSECTION_OBSERVER) #include "IntersectionObserverCallback.h" #include "IntersectionObserverEntry.h" #include <wtf/RefCounted.h> #include <wtf/Variant.h> #include <wtf/text/WTFString.h> namespace WebCore { class Element; class IntersectionObserver : public RefCounted<IntersectionObserver> { public: struct Init { RefPtr<Element> root; String rootMargin; Variant<double, Vector<double>> threshold; }; static Ref<IntersectionObserver> create(Ref<IntersectionObserverCallback>&& callback, Init&& init) { return adoptRef(*new IntersectionObserver(WTFMove(callback), WTFMove(init))); } Element* root() const { return m_root.get(); } String rootMargin() const { return m_rootMargin; } const Vector<double>& thresholds() const { return m_thresholds; } void observe(Element&); void unobserve(Element&); void disconnect(); Vector<RefPtr<IntersectionObserverEntry>> takeRecords(); private: IntersectionObserver(Ref<IntersectionObserverCallback>&&, Init&&); RefPtr<Element> m_root; String m_rootMargin; Vector<double> m_thresholds; Ref<IntersectionObserverCallback> m_callback; }; } // namespace WebCore #endif // ENABLE(INTERSECTION_OBSERVER)