IntersectionObserver: second cut.

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

+// Copyright 2015 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 "core/dom/IntersectionObservation.h"

[esprehn, 2015/12/17 01:40:28]

you can forward declare IntersectionObservation if you put the
constructor/destructor out of line

[szager1, 2015/12/17 20:27:25]

Yep, it works, done.

+#include "core/dom/IntersectionObserver.h"

[esprehn, 2015/12/17 01:40:28]

ditto

[szager1, 2015/12/17 20:27:25]

Done.

+
+namespace blink {
+
+class ElementIntersectionObserverData : public GarbageCollectedFinalized<ElementIntersectionObserverData> {
+public:
+    DECLARE_TRACE();
+    ElementIntersectionObserverData() { }

[esprehn, 2015/12/17 01:40:28]

can we put both the constructor and the destructor out of line?

This is putting all the code for the HashMap and HashSet below inline.

[szager1, 2015/12/17 20:27:25]

Done.

+
+    bool hasIntersectionObserver() const;
+    bool hasIntersectionObservation() const;
+    bool hasObservationFor(IntersectionObserver&) const;
+    void addObservation(IntersectionObservation&);
+    void removeObservation(IntersectionObserver&);
+    void activateValidIntersectionObservers(Element&);
+    void deactivateAllIntersectionObservers(Element&);
+
+#if !ENABLE(OILPAN)
+    void dispose();
+#endif
+
+    WeakPtr<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)
+    OwnPtrWillBeMember<WeakPtrFactory<Element>> m_weakPointerFactory;
+#endif
+};
+
+} // namespace blink {
+
+#endif // ElementIntersectionObserverData_h