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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/html/shadow/HTMLShadowElement.h"
     33 
     34 #include "HTMLNames.h"
     35 #include "core/dom/shadow/ShadowRoot.h"
     36 
     37 namespace WebCore {
     38 
     39 class Document;
     40 
     41 inline HTMLShadowElement::HTMLShadowElement(const QualifiedName& tagName, Document* document)
     42     : InsertionPoint(tagName, document)
     43 {
     44     ASSERT(hasTagName(HTMLNames::shadowTag));
     45     ScriptWrappable::init(this);
     46 }
     47 
     48 PassRefPtr<HTMLShadowElement> HTMLShadowElement::create(const QualifiedName& tagName, Document* document)
     49 {
     50     return adoptRef(new HTMLShadowElement(tagName, document));
     51 }
     52 
     53 HTMLShadowElement::~HTMLShadowElement()
     54 {
     55 }
     56 
     57 ShadowRoot* HTMLShadowElement::olderShadowRoot()
     58 {
     59     ShadowRoot* containingRoot = containingShadowRoot();
     60     if (!containingRoot)
     61         return 0;
     62 
     63     document()->updateDistributionForNodeIfNeeded(this);
     64 
     65     ShadowRoot* older = containingRoot->olderShadowRoot();
     66     if (!older || !older->shouldExposeToBindings() || older->insertionPoint() != this)
     67         return 0;
     68 
     69     ASSERT(older->shouldExposeToBindings());
     70     return older;
     71 }
     72 
     73 static inline Element* hostForOldestAuthorShadowRoot(ShadowRoot* root)
     74 {
     75     return root && root->isOldestAuthorShadowRoot() ? root->host() : 0;
     76 }
     77 
     78 bool HTMLShadowElement::shouldSelect() const
     79 {
     80     Element* host = hostForOldestAuthorShadowRoot(containingShadowRoot());
     81     return !host || host->supportsShadowElementForUserAgentShadow();
     82 }
     83 
     84 Node::InsertionNotificationRequest HTMLShadowElement::insertedInto(ContainerNode* insertionPoint)
     85 {
     86     if (insertionPoint->inDocument() && !shouldSelect()) {
     87         String message = String::format("<shadow> doesn't work for %s element host.", containingShadowRoot()->host()->nodeName().utf8().data());
     88         document()->addConsoleMessage(RenderingMessageSource, WarningMessageLevel, message);
     89     }
     90     return InsertionPoint::insertedInto(insertionPoint);
     91 }
     92 
     93 } // namespace WebCore
     94 
     95