Support the essential part of Shadow DOM v1

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 61 matching lines @@
 #include "core/events/PointerEvent.h"
 #include "core/events/TextEvent.h"
 #include "core/events/TouchEvent.h"
 #include "core/events/UIEvent.h"
 #include "core/events/WheelEvent.h"
 #include "core/frame/EventHandlerRegistry.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLDialogElement.h"
 #include "core/html/HTMLFrameOwnerElement.h"
+#include "core/html/HTMLSlotElement.h"
 #include "core/input/EventHandler.h"
 #include "core/layout/LayoutBox.h"
 #include "core/page/ContextMenuController.h"
 #include "core/page/Page.h"
 #include "core/svg/graphics/SVGImage.h"
 #include "platform/EventDispatchForbiddenScope.h"
 #include "platform/TraceEvent.h"
 #include "platform/TracedValue.h"
 #include "wtf/HashSet.h"
 #include "wtf/Partitions.h"
@@ skipping 861 matching lines @@
         // but if the element is draggable then dragging should take priority over selection.
         if (style.userDrag() == DRAG_ELEMENT && style.userSelect() == SELECT_NONE)
             return false;
     }
     ContainerNode* parent = ComposedTreeTraversal::parent(*this);
     return parent ? parent->canStartSelection() : true;
 }
 
 bool Node::canParticipateInComposedTree() const
 {
-    return !isShadowRoot() && !isActiveInsertionPoint(*this);
+    return !isShadowRoot() && !isSlotOrActiveInsertionPoint();
+}
+
+bool Node::isSlotOrActiveInsertionPoint() const
+{
+    return isHTMLSlotElement(*this) || isActiveInsertionPoint(*this);
 }
 
 Element* Node::shadowHost() const
 {
     if (ShadowRoot* root = containingShadowRoot())
         return root->host();
     return nullptr;
 }
 
 ShadowRoot* Node::containingShadowRoot() const
@@ skipping 1222 matching lines @@
     for (size_t i = 0; i < insertionPoints.size(); ++i) {
         InsertionPoint* insertionPoint = insertionPoints[i];
         ASSERT(insertionPoint->containingShadowRoot());
         if (!insertionPoint->containingShadowRoot()->isOpen())
             break;
         filteredInsertionPoints.append(insertionPoint);
     }
     return StaticNodeList::adopt(filteredInsertionPoints);
 }
 
+HTMLSlotElement* Node::assignedSlot() const
+{
+    ASSERT(!needsDistributionRecalc());
+    Element* parent = parentElement();
+    if (!parent)
+        return nullptr;
+    if (ElementShadow* shadow = parent->shadow()) {
+        if (shadow->isV1())
+            return shadow->assignedSlotFor(*this);
+    }
+    return nullptr;
+}
+
 void Node::setFocus(bool flag)
 {
     document().userActionElements().setFocused(this, flag);
 }
 
 void Node::setActive(bool flag)
 {
     document().userActionElements().setActive(this, flag);
 }
 
@@ skipping 135 matching lines @@
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
     else
         fprintf(stderr, "Cannot showNodePath for (nil)\n");
 }
 
 #endif