third_party/WebKit/Source/core/html/HTMLShadowElement.cpp

   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,
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  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  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 nullptr;
  59
  60     updateDistribution();
  61
  62     ShadowRoot* older = containingRoot->olderShadowRoot();
  63     if (!older || !older->isOpen() || older->shadowInsertionPointOfYoungerShadowRoot() != this)
  64         return nullptr;
  65
  66     ASSERT(older->isOpen());
  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