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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/HTMLShadowElement.h"
     33 
     34 #include "core/HTMLNames.h"
     35 #include "core/dom/Document.h"
     36 #include "core/dom/shadow/ShadowRoot.h"
     37 #include "core/inspector/ConsoleMessage.h"
     38 
     39 namespace blink {
     40 
     41 class Document;
     42 
     43 inline HTMLShadowElement::HTMLShadowElement(Document& document)
     44     : InsertionPoint(HTMLNames::shadowTag, document)
     45 {
     46 }
     47 
     48 DEFINE_NODE_FACTORY(HTMLShadowElement)
     49 
     50 HTMLShadowElement::~HTMLShadowElement()
     51 {
     52 }
     53 
     54 ShadowRoot* HTMLShadowElement::olderShadowRoot()
     55 {
     56     ShadowRoot* containingRoot = containingShadowRoot();
     57     if (!containingRoot)
     58         return 0;
     59 
     60     document().updateDistributionForNodeIfNeeded(this);
     61 
     62     ShadowRoot* older = containingRoot->olderShadowRoot();
     63     if (!older || !older->shouldExposeToBindings() || older->shadowInsertionPointOfYoungerShadowRoot() != this)
     64         return 0;
     65 
     66     ASSERT(older->shouldExposeToBindings());
     67     return older;
     68 }
     69 
     70 Node::InsertionNotificationRequest HTMLShadowElement::insertedInto(ContainerNode* insertionPoint)
     71 {
     72     if (insertionPoint->inDocument()) {
     73         // Warn if trying to reproject between user agent and author shadows.
     74         ShadowRoot* root = containingShadowRoot();
     75         if (root && root->olderShadowRoot() && root->type() != root->olderShadowRoot()->type()) {
     76             String message = String::format("<shadow> doesn't work for %s element host.", root->host()->tagName().utf8().data());
     77             document().addConsoleMessage(ConsoleMessage::create(RenderingMessageSource, WarningMessageLevel, message));
     78         }
     79     }
     80     return InsertionPoint::insertedInto(insertionPoint);
     81 }
     82 
     83 } // namespace blink
     84 
     85