Source/core/html/shadow/HTMLShadowElement.cpp

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * in the documentation and/or other materials provided with the
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#include "config.h"
#include "core/html/shadow/HTMLShadowElement.h"

#include "HTMLNames.h"
#include "core/dom/shadow/ShadowRoot.h"

namespace WebCore {

class Document;

inline HTMLShadowElement::HTMLShadowElement(const QualifiedName& tagName, Document& document)
    : InsertionPoint(tagName, document)
{
    ASSERT(hasTagName(HTMLNames::shadowTag));
    ScriptWrappable::init(this);
}

PassRefPtr<HTMLShadowElement> HTMLShadowElement::create(const QualifiedName& tagName, Document& document)
{
    return adoptRef(new HTMLShadowElement(tagName, document));
}

HTMLShadowElement::~HTMLShadowElement()
{
}

ShadowRoot* HTMLShadowElement::olderShadowRoot()
{
    ShadowRoot* containingRoot = containingShadowRoot();
    if (!containingRoot)
        return 0;

    document().updateDistributionForNodeIfNeeded(this);

    ShadowRoot* older = containingRoot->olderShadowRoot();
    if (!older || !older->shouldExposeToBindings() || older->shadowInsertionPointOfYoungerShadowRoot() != this)
        return 0;

    ASSERT(older->shouldExposeToBindings());
    return older;
}

Node::InsertionNotificationRequest HTMLShadowElement::insertedInto(ContainerNode* insertionPoint)
{
    if (insertionPoint->inDocument()) {
        // Warn if trying to reproject between user agent and author shadows.
        ShadowRoot* root = containingShadowRoot();
        if (root && root->olderShadowRoot() && root->type() != root->olderShadowRoot()->type()) {
            String message = String::format("<shadow> doesn't work for %s element host.", root->host()->tagName().utf8().data());
            document().addConsoleMessage(RenderingMessageSource, WarningMessageLevel, message);
        }
    }
    return InsertionPoint::insertedInto(insertionPoint);
}

} // namespace WebCore