Refactor ElementShadow by separating v0 related features as ElementShadowV0

third_party/WebKit/Source/core/dom/shadow/ElementShadowV0.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
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  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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-#ifndef ElementShadow_h
-#define ElementShadow_h
+#ifndef ElementShadowV0_h
+#define ElementShadowV0_h
 
 #include "core/CoreExport.h"
 #include "core/dom/shadow/InsertionPoint.h"
 #include "core/dom/shadow/SelectRuleFeatureSet.h"
-#include "core/dom/shadow/ShadowRoot.h"
 #include "platform/heap/Handle.h"
-#include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
-class CORE_EXPORT ElementShadow final : public GarbageCollectedFinalized<ElementShadow> {
-    WTF_MAKE_NONCOPYABLE(ElementShadow);
+class CORE_EXPORT ElementShadowV0 final : public GarbageCollectedFinalized<ElementShadowV0> {
+    WTF_MAKE_NONCOPYABLE(ElementShadowV0);
 public:
-    static ElementShadow* create();
-    ~ElementShadow();
+    static ElementShadowV0* create(ElementShadow&);
+    ~ElementShadowV0();
 
-    Element& host() const;
-    ShadowRoot& youngestShadowRoot() const;
-    ShadowRoot& oldestShadowRoot() const { DCHECK(m_shadowRoot); return *m_shadowRoot; }
-    ElementShadow* containingShadow() const;
-
-    ShadowRoot& addShadowRoot(Element& shadowHost, ShadowRootType);
-
-    bool hasSameStyles(const ElementShadow*) const;
-
-    void attach(const Node::AttachContext&);
-    void detach(const Node::AttachContext&);
-
-    void distributeIfNeeded();
-    void setNeedsDistributionRecalc();
-    bool needsDistributionRecalc() const { return m_needsDistributionRecalc; }
-
-    bool isV1() const { return youngestShadowRoot().isV1(); };
-    bool isOpenOrV0() const { return youngestShadowRoot().isOpenOrV0(); };
-
-    // For only v0
     void willAffectSelector();
     const SelectRuleFeatureSet& ensureSelectFeatureSet();
 
     const InsertionPoint* finalDestinationInsertionPointFor(const Node*) const;
     const DestinationInsertionPoints* destinationInsertionPointsFor(const Node*) const;
 
+    void distribute();
     void didDistributeNode(const Node*, InsertionPoint*);
+    void clearDistribution();
 
     DECLARE_TRACE();
     DECLARE_TRACE_WRAPPERS();
 
 private:
-    ElementShadow();
+    explicit ElementShadowV0(ElementShadow&);
 
-    void appendShadowRoot(ShadowRoot&);
+    ShadowRoot& youngestShadowRoot() const;
+    ShadowRoot& oldestShadowRoot() const;
 
-    void distribute();
-    void clearDistributionV0();
-
-    void distributeV0();
-    void distributeV1();
-
-    void collectSelectFeatureSetFrom(ShadowRoot&);
     void distributeNodeChildrenTo(InsertionPoint*, ContainerNode*);
 
+    void collectSelectFeatureSetFrom(const ShadowRoot&);
     bool needsSelectFeatureSet() const { return m_needsSelectFeatureSet; }
     void setNeedsSelectFeatureSet() { m_needsSelectFeatureSet = true; }
 
-    Member<ShadowRoot> m_shadowRoot;
-    bool m_needsDistributionRecalc;
-
-    // For only v0
+    Member<ElementShadow> m_elementShadow;
     using NodeToDestinationInsertionPoints = HeapHashMap<Member<const Node>, Member<DestinationInsertionPoints>>;
     NodeToDestinationInsertionPoints m_nodeToInsertionPoints;
     SelectRuleFeatureSet m_selectFeatures;
     bool m_needsSelectFeatureSet;
 };
 
-inline Element& ElementShadow::host() const
-{
-    DCHECK(m_shadowRoot);
-    return m_shadowRoot->host();
-}
-
-inline ShadowRoot* Node::youngestShadowRoot() const
-{
-    if (!isElementNode())
-        return 0;
-    return toElement(this)->youngestShadowRoot();
-}
-
-inline ShadowRoot* Element::youngestShadowRoot() const
-{
-    if (ElementShadow* shadow = this->shadow())
-        return &shadow->youngestShadowRoot();
-    return 0;
-}
-
-inline ElementShadow* ElementShadow::containingShadow() const
-{
-    if (ShadowRoot* parentRoot = host().containingShadowRoot())
-        return parentRoot->owner();
-    return 0;
-}
-
-inline void ElementShadow::distributeIfNeeded()
-{
-    if (m_needsDistributionRecalc)
-        distribute();
-    m_needsDistributionRecalc = false;
-}
-
 } // namespace blink
 
 #endif