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      1 /*
      2  * Copyright (C) 2013 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  *     * Neither the name of Google Inc. nor the names of its
     11  * contributors may be used to endorse or promote products derived from
     12  * this software without specific prior written permission.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     15  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     16  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     17  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     18  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     19  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     20  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "core/dom/EventPathWalker.h"
     29 
     30 #include "core/dom/shadow/ContentDistributor.h"
     31 #include "core/dom/shadow/InsertionPoint.h"
     32 #include "core/dom/shadow/ShadowRoot.h"
     33 
     34 namespace WebCore {
     35 
     36 EventPathWalker::EventPathWalker(const Node* node)
     37     : m_node(node)
     38     , m_distributedNode(node)
     39     , m_isVisitingInsertionPointInReprojection(false)
     40 {
     41     ASSERT(node);
     42     // FIXME: It's not clear if we need this document check, but I think we do
     43     // since DocType nodes from document.implementation.createDocumentType
     44     // don't have a document().
     45     if (Document* document = node->document())
     46         document->updateDistributionForNodeIfNeeded(const_cast<Node*>(node));
     47 }
     48 
     49 Node* EventPathWalker::parent(const Node* node)
     50 {
     51     EventPathWalker walker(node);
     52     walker.moveToParent();
     53     return walker.node();
     54 }
     55 
     56 void EventPathWalker::moveToParent()
     57 {
     58     ASSERT(m_node);
     59     ASSERT(m_distributedNode);
     60     if (ElementShadow* shadow = shadowOfParent(m_node)) {
     61         if (InsertionPoint* insertionPoint = shadow->distributor().findInsertionPointFor(m_distributedNode)) {
     62             m_node = insertionPoint;
     63             m_isVisitingInsertionPointInReprojection = true;
     64             return;
     65         }
     66     }
     67     if (!m_node->isShadowRoot()) {
     68         m_node = m_node->parentNode();
     69         if (!(m_node && m_node->isShadowRoot() && toShadowRoot(m_node)->insertionPoint()))
     70             m_distributedNode = m_node;
     71         m_isVisitingInsertionPointInReprojection = false;
     72         return;
     73     }
     74 
     75     const ShadowRoot* shadowRoot = toShadowRoot(m_node);
     76     if (InsertionPoint* insertionPoint = shadowRoot->insertionPoint()) {
     77         m_node = insertionPoint;
     78         m_isVisitingInsertionPointInReprojection = true;
     79         return;
     80     }
     81     m_node = shadowRoot->host();
     82     m_distributedNode = m_node;
     83     m_isVisitingInsertionPointInReprojection = false;
     84 }
     85 
     86 } // namespace
     87