IntersectionObserver: second cut.

third_party/WebKit/Source/core/dom/ElementIntersectionObserverData.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ElementIntersectionObserverData_h
+#define ElementIntersectionObserverData_h
+
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class Element;
+class IntersectionObservation;
+class IntersectionObserver;
+
+class ElementIntersectionObserverData : public GarbageCollectedFinalized<ElementIntersectionObserverData> {
+public:
+    DECLARE_TRACE();
+    ElementIntersectionObserverData();
+    ~ElementIntersectionObserverData();
+
+    bool hasIntersectionObserver() const;
+    bool hasIntersectionObservation() const;
+    IntersectionObservation* getObservationFor(IntersectionObserver&);
+    void addObservation(IntersectionObservation&);
+    void removeObservation(IntersectionObserver&);
+    void activateValidIntersectionObservers(Element&);
+    void deactivateAllIntersectionObservers(Element&);
+
+#if !ENABLE(OILPAN)
+    void dispose();
+#endif
+
+    WeakPtrWillBeRawPtr<Element> createWeakPtr(Element*);
+
+private:
+    // IntersectionObservers for which the Element owning this data is root.
+    HeapHashSet<WeakMember<IntersectionObserver>> m_intersectionObservers;
+    // IntersectionObservations for which the Element owning this data is target.
+    HeapHashMap<Member<IntersectionObserver>, Member<IntersectionObservation>> m_intersectionObservations;
+
+#if !ENABLE(OILPAN)
+    OwnPtr<WeakPtrFactory<Element>> m_weakPointerFactory;
+#endif
+};
+
+} // namespace blink
+
+#endif // ElementIntersectionObserverData_h