IntersectionObserver: second cut.

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * 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)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 36 matching lines @@
 #include "core/css/resolver/StyleResolver.h"
 #include "core/css/resolver/StyleResolverParentScope.h"
 #include "core/css/resolver/StyleResolverStats.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/Attr.h"
 #include "core/dom/CSSSelectorWatch.h"
 #include "core/dom/ClientRect.h"
 #include "core/dom/ClientRectList.h"
 #include "core/dom/DatasetDOMStringMap.h"
 #include "core/dom/ElementDataCache.h"
+#include "core/dom/ElementIntersectionObserverData.h"
 #include "core/dom/ElementRareData.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/FirstLetterPseudoElement.h"
 #include "core/dom/Fullscreen.h"
 #include "core/dom/LayoutTreeBuilder.h"
 #include "core/dom/MutationObserverInterestGroup.h"
 #include "core/dom/MutationRecord.h"
 #include "core/dom/NamedNodeMap.h"
 #include "core/dom/NodeComputedStyle.h"
@@ skipping 1379 matching lines @@
     ContainerNode::insertedInto(insertionPoint);
 
     if (containsFullScreenElement() && parentElement() && !parentElement()->containsFullScreenElement())
         setContainsFullScreenElementOnAncestorsCrossingFrameBoundaries(true);
 
     ASSERT(!hasRareData() || !elementRareData()->hasPseudoElements());
 
     if (!insertionPoint->isInTreeScope())
         return InsertionDone;
 
-    if (hasRareData())
-        elementRareData()->clearClassListValueForQuirksMode();
+    if (hasRareData()) {
+        ElementRareData* rareData = elementRareData();
+        rareData->clearClassListValueForQuirksMode();
+        if (rareData->intersectionObserverData())
+            rareData->intersectionObserverData()->activateValidIntersectionObservers(*this);
+    }
 
     if (isUpgradedCustomElement() && inDocument())
         CustomElement::didAttach(this, document());
 
     TreeScope& scope = insertionPoint->treeScope();
     if (scope != treeScope())
         return InsertionDone;
 
     const AtomicString& idValue = getIdAttribute();
     if (!idValue.isNull())
@@ skipping 57 matching lines @@
 
     clearElementFlag(IsInCanvasSubtree);
 
     if (hasRareData()) {
         ElementRareData* data = elementRareData();
 
         data->clearRestyleFlags();
 
         if (ElementAnimations* elementAnimations = data->elementAnimations())
             elementAnimations->cssAnimations().cancel();
+
+        if (data->intersectionObserverData())
+            data->intersectionObserverData()->deactivateAllIntersectionObservers(*this);
     }
 }
 
 void Element::attach(const AttachContext& context)
 {
     ASSERT(document().inStyleRecalc());
 
     // We've already been through detach when doing an attach, but we might
     // need to clear any state that's been added since then.
     if (hasRareData() && styleChangeType() == NeedsReattachStyleChange) {
@@ skipping 1030 matching lines @@
             if (!exceptionState.hadException())
                 return newChild;
         }
         return nullptr;
     }
 
     exceptionState.throwDOMException(SyntaxError, "The value provided ('" + where + "') is not one of 'beforeBegin', 'afterBegin', 'beforeEnd', or 'afterEnd'.");
     return nullptr;
 }
 
+ElementIntersectionObserverData* Element::intersectionObserverData() const
+{
+    if (elementRareData())
+        return elementRareData()->intersectionObserverData();
+    return nullptr;
+}
+
+ElementIntersectionObserverData& Element::ensureIntersectionObserverData()
+{
+    return ensureElementRareData().ensureIntersectionObserverData();
+}
+
 // Step 1 of http://domparsing.spec.whatwg.org/#insertadjacenthtml()
 static Element* contextElementForInsertion(const String& where, Element* element, ExceptionState& exceptionState)
 {
     if (equalIgnoringCase(where, "beforeBegin") || equalIgnoringCase(where, "afterEnd")) {
         Element* parent = element->parentElement();
         if (!parent) {
             exceptionState.throwDOMException(NoModificationAllowedError, "The element has no parent.");
             return nullptr;
         }
         return parent;
@@ skipping 1025 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink