Rewrite Shadow DOM distribution engine to support partial synchronous distribution for v1

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 60 matching lines @@
 #include "core/dom/ScriptableDocumentParser.h"
 #include "core/dom/SelectorQuery.h"
 #include "core/dom/StyleChangeReason.h"
 #include "core/dom/StyleEngine.h"
 #include "core/dom/Text.h"
 #include "core/dom/custom/V0CustomElement.h"
 #include "core/dom/custom/V0CustomElementRegistrationContext.h"
 #include "core/dom/shadow/InsertionPoint.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/dom/shadow/ShadowRootInit.h"
+#include "core/dom/shadow/SlotAssignment.h"
 #include "core/editing/EditingUtilities.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/iterators/TextIterator.h"
 #include "core/editing/serializers/Serialization.h"
 #include "core/events/EventDispatcher.h"
 #include "core/events/FocusEvent.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/HostsUsingFeatures.h"
 #include "core/frame/LocalDOMWindow.h"
@@ skipping 1047 matching lines @@
         return value.lowerASCII();
     return value;
 }
 
 void Element::attributeChanged(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& newValue, AttributeModificationReason reason)
 {
     if (ElementShadow* parentElementShadow = shadowWhereNodeCanBeDistributed(*this)) {
         if (shouldInvalidateDistributionWhenAttributeChanged(parentElementShadow, name, newValue))
             parentElementShadow->setNeedsDistributionRecalc();
     }
-    if (name == HTMLNames::slotAttr && isChildOfV1ShadowHost()) {
-        parentElementShadow()->setNeedsDistributionRecalc();
-        if (oldValue != newValue)
-            parentElement()->shadowRootIfV1()->assignV1();
+    if (name == HTMLNames::slotAttr && oldValue != newValue) {
+        if (ShadowRoot* root = v1ShadowRootOfParent())
+            root->ensureSlotAssignment().hostChildSlotNameChanged(oldValue, newValue);
     }
 
     parseAttribute(name, oldValue, newValue);
 
     document().incDOMTreeVersion();
 
     if (name == HTMLNames::idAttr) {
         AtomicString oldId = elementData()->idForStyleResolution();
         AtomicString newId = makeIdForStyleResolution(newValue, document().inQuirksMode());
         if (newId != oldId) {
@@ skipping 338 matching lines @@
 
         if (ElementAnimations* elementAnimations = data->elementAnimations())
             elementAnimations->cssAnimations().cancel();
 
         if (data->intersectionObserverData())
             data->intersectionObserverData()->deactivateAllIntersectionObservers(*this);
     }
 
     if (document().frame())
         document().frame()->eventHandler().elementRemoved(this);
-
-    if (HTMLSlotElement* slot = assignedSlot()) {
-        ShadowRoot* root = slot->containingShadowRoot();
-        if (root && root->isV1())
-            root->assignV1();
-    }
 }
 
 void Element::attach(const AttachContext& context)
 {
     DCHECK(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() && getStyleChangeType() == NeedsReattachStyleChange) {
         ElementRareData* data = elementRareData();
@@ skipping 555 matching lines @@
 }
 
 void Element::childrenChanged(const ChildrenChange& change)
 {
     ContainerNode::childrenChanged(change);
 
     checkForEmptyStyleChange();
     if (!change.byParser && change.isChildElementChange())
         checkForSiblingStyleChanges(change.type == ElementRemoved ? SiblingElementRemoved : SiblingElementInserted, change.siblingBeforeChange, change.siblingAfterChange);
 
-    if (ElementShadow* shadow = this->shadow()) {
+    // TODO(hayato): Confirm that we can skip this if a shadow tree is v1.
+    if (ElementShadow* shadow = this->shadow())
         shadow->setNeedsDistributionRecalc();
-        if (document().shadowCascadeOrder() == ShadowCascadeOrder::ShadowCascadeV1) {
-            ShadowRoot* root = isShadowHost(*this) && shadowRoot()->isV1() ? shadowRootIfV1() : isHTMLSlotElement(*this) ? containingShadowRoot() : nullptr;
-            if (root && root->isV1())
-                root->assignV1();
-        }
-    }
 }
 
 void Element::finishParsingChildren()
 {
     setIsFinishedParsingChildren(true);
     checkForEmptyStyleChange();
     checkForSiblingStyleChanges(FinishedParsingChildren, lastChild(), nullptr);
 }
 
 #ifndef NDEBUG
@@ skipping 1606 matching lines @@
 
 DEFINE_TRACE_WRAPPERS(Element)
 {
     if (hasRareData()) {
         visitor->traceWrappers(elementRareData());
     }
     ContainerNode::traceWrappers(visitor);
 }
 
 } // namespace blink