Intersection Observer first draft

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 106 matching lines @@
 class HTMLElement;
 class HTMLFrameOwnerElement;
 class HTMLHeadElement;
 class HTMLImportLoader;
 class HTMLImportsController;
 class HTMLLinkElement;
 class HTMLScriptElement;
 class HitTestRequest;
 class IdleRequestCallback;
 class InputDeviceCapabilities;
+class IntersectionObserver;
 class LayoutPoint;
 class LiveNodeListBase;
 class Locale;
 class LocalFrame;
 class Location;
 class MainThreadTaskRunner;
 class MediaQueryListListener;
 class MediaQueryMatcher;
 class NodeFilter;
 class NodeIterator;
@@ skipping 28 matching lines @@
 class TreeWalker;
 class VisitedLinkState;
 class WebGLRenderingContext;
 
 struct AnnotatedRegionValue;
 struct IconURL;
 
 using MouseEventWithHitTestResults = EventWithHitTestResults<PlatformMouseEvent>;
 using ExceptionCode = int;
 
+using IntersectionObservers = WillBeHeapListHashSet<RefPtrWillBeMember<IntersectionObserver>>;
+
 enum StyleResolverUpdateMode {
     // Discards the StyleResolver and rebuilds it.
     FullStyleUpdate,
     // Attempts to use StyleInvalidationAnalysis to avoid discarding the entire StyleResolver.
     AnalyzedStyleUpdate
 };
 
 enum NodeListInvalidationType {
     DoNotInvalidateOnAttributeChanges = 0,
     InvalidateOnClassAttrChange,
@@ skipping 485 matching lines @@
     bool hasListenerType(ListenerType listenerType) const { return (m_listenerTypes & listenerType); }
     void addListenerTypeIfNeeded(const AtomicString& eventType);
 
     bool hasMutationObserversOfType(MutationObserver::MutationType type) const
     {
         return m_mutationObserverTypes & type;
     }
     bool hasMutationObservers() const { return m_mutationObserverTypes; }
     void addMutationObserverTypes(MutationObserverOptions types) { m_mutationObserverTypes |= types; }
 
+    void activateIntersectionObserver(IntersectionObserver&);
+    void resumeSuspendedIntersectionObservers();
+
     void updateViewportDescription();
     void processReferrerPolicy(const String& policy);
 
     // Returns the owning element in the parent document.
     // Returns nullptr if this is the top level document.
     HTMLFrameOwnerElement* ownerElement() const;
 
     // Returns true if this document belongs to a frame that the parent document
     // made invisible (for instance by setting as style display:none).
     bool isInInvisibleSubframe() const;
@@ skipping 363 matching lines @@
 #if !ENABLE(OILPAN)
     void dispose() override;
 #endif
 
     virtual PassRefPtrWillBeRawPtr<Document> cloneDocumentWithoutChildren();
 
     bool importContainerNodeChildren(ContainerNode* oldContainerNode, PassRefPtrWillBeRawPtr<ContainerNode> newContainerNode, ExceptionState&);
     void lockCompatibilityMode() { m_compatibilityModeLocked = true; }
     ParserSynchronizationPolicy parserSynchronizationPolicy() const { return m_parserSyncPolicy; }
 
+    void deliverIntersectionObservationsTimerFired(Timer<Document>*);
+
 private:
     friend class IgnoreDestructiveWriteCountIncrementer;
     friend class NthIndexCache;
 
     bool isDocumentFragment() const = delete; // This will catch anyone doing an unnecessary check.
     bool isDocumentNode() const = delete; // This will catch anyone doing an unnecessary check.
     bool isElementNode() const = delete; // This will catch anyone doing an unnecessary check.
 
     ScriptedAnimationController& ensureScriptedAnimationController();
     ScriptedIdleTaskController& ensureScriptedIdleTaskController();
@@ skipping 245 matching lines @@
     WeakPtrWillBeWeakMember<Document> m_contextDocument;
 
     bool m_hasFullscreenSupplement; // For early return in Fullscreen::fromIfExists()
 
     WillBeHeapVector<RefPtrWillBeMember<Element>> m_topLayerElements;
 
     int m_loadEventDelayCount;
     Timer<Document> m_loadEventDelayTimer;
     Timer<Document> m_pluginLoadingTimer;
 
+    Timer<Document> m_deliverIntersectionObservationsTimer;
+    IntersectionObservers m_activeIntersectionObservers;
+    IntersectionObservers m_suspendedIntersectionObservers;
+
     ViewportDescription m_viewportDescription;
     ViewportDescription m_legacyViewportDescription;
     Length m_viewportDefaultMinWidth;
 
     ReferrerPolicy m_referrerPolicy;
 
     DocumentTiming m_documentTiming;
     RefPtrWillBeMember<MediaQueryMatcher> m_mediaQueryMatcher;
     bool m_writeRecursionIsTooDeep;
     unsigned m_writeRecursionDepth;
@@ skipping 90 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h