Intersection Observer first draft

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003-2011, 2013, 2014 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 38 matching lines @@
 class ClientRect;
 class ClientRectList;
 class CustomElementDefinition;
 class DOMStringMap;
 class DOMTokenList;
 class Dictionary;
 class ElementRareData;
 class ElementShadow;
 class ExceptionState;
 class Image;
+class IntersectionObserver;
 class IntSize;
 class Locale;
 class MutableStylePropertySet;
 class PropertySetCSSStyleDeclaration;
 class PseudoElement;
 class ScrollState;
 class ScrollToOptions;
 class ShadowRoot;
 class ShadowRootInit;
 class StylePropertySet;
@@ skipping 11 matching lines @@
     ContainsFullScreenElement = 1 << 3,
     IsInTopLayer = 1 << 4,
     HasPendingResources = 1 << 5,
 
     NumberOfElementFlags = 6, // Required size of bitfield used to store the flags.
 };
 
 enum class ShadowRootType;
 
 typedef WillBeHeapVector<RefPtrWillBeMember<Attr>> AttrNodeList;
+typedef WillBeHeapVector<RawPtrWillBeMember<IntersectionObserver>> IntersectionObserverList;
 
 class CORE_EXPORT Element : public ContainerNode {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<Element> create(const QualifiedName&, Document*);
     ~Element() override;
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(beforecopy);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(beforecut);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(beforepaste);
@@ skipping 408 matching lines @@
     void setTabIndex(int);
     short tabIndex() const override;
 
     void incrementProxyCount();
     void decrementProxyCount();
 
     DECLARE_VIRTUAL_TRACE();
 
     SpellcheckAttributeState spellcheckAttributeState() const;
 
+    void registerIntersectionObserver(IntersectionObserver*);
+    void unregisterIntersectionObserver(IntersectionObserver*);
+    bool hasIntersectionObserver() const override { return m_intersectionObservers.size() > 0; }
+    IntersectionObserverList& intersectionObservers() { return m_intersectionObservers; }
+
 protected:
     Element(const QualifiedName& tagName, Document*, ConstructionType);
 
     const ElementData* elementData() const { return m_elementData.get(); }
     UniqueElementData& ensureUniqueElementData();
 
     void addPropertyToPresentationAttributeStyle(MutableStylePropertySet*, CSSPropertyID, CSSValueID identifier);
     void addPropertyToPresentationAttributeStyle(MutableStylePropertySet*, CSSPropertyID, double value, CSSPrimitiveValue::UnitType);
     void addPropertyToPresentationAttributeStyle(MutableStylePropertySet*, CSSPropertyID, const String& value);
 
@@ skipping 126 matching lines @@
 
     AttrNodeList& ensureAttrNodeList();
     void removeAttrNodeList();
     void detachAllAttrNodesFromElement();
     void detachAttrNodeFromElementWithValue(Attr*, const AtomicString& value);
     void detachAttrNodeAtIndex(Attr*, size_t index);
 
     v8::Local<v8::Object> wrapCustomElement(v8::Isolate*, v8::Local<v8::Object> creationContext);
 
     RefPtrWillBeMember<ElementData> m_elementData;
+    IntersectionObserverList m_intersectionObservers;
 };
 
 DEFINE_NODE_TYPE_CASTS(Element, isElementNode());
 template <typename T> bool isElementOfType(const Node&);
 template <> inline bool isElementOfType<const Element>(const Node& node) { return node.isElementNode(); }
 template <typename T> inline bool isElementOfType(const Element& element) { return isElementOfType<T>(static_cast<const Node&>(element)); }
 template <> inline bool isElementOfType<const Element>(const Element&) { return true; }
 
 // Type casting.
 template<typename T> inline T& toElement(Node& node)
@@ skipping 222 matching lines @@
     static PassRefPtrWillBeRawPtr<T> create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     PassRefPtrWillBeRawPtr<T> T::create(const QualifiedName& tagName, Document& document) \
     { \
         return adoptRefWillBeNoop(new T(tagName, document)); \
     }
 
 } // namespace
 
 #endif // Element_h