EventPathWalker.cpp   [plain text]

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#include "config.h"
#include "EventPathWalker.h"

#include "ContentDistributor.h"
#include "InsertionPoint.h"
#include "ShadowRoot.h"

namespace WebCore {

EventPathWalker::EventPathWalker(const Node* node)
    : m_node(node)
    , m_distributedNode(node)
    , m_isVisitingInsertionPointInReprojection(false)
{
    ASSERT(node);
}

Node* EventPathWalker::parent(const Node* node)
{
    EventPathWalker walker(node);
    walker.moveToParent();
    return walker.node();
}

void EventPathWalker::moveToParent()
{
    ASSERT(m_node);
    ASSERT(m_distributedNode);
    if (ElementShadow* shadow = shadowOfParent(m_node)) {
        if (InsertionPoint* insertionPoint = shadow->distributor().findInsertionPointFor(m_distributedNode)) {
            m_node = insertionPoint;
            m_isVisitingInsertionPointInReprojection = true;
            return;
        }
    }
    if (!m_node->isShadowRoot()) {
        m_node = m_node->parentNode();
        m_isVisitingInsertionPointInReprojection = false;
        return;
    }
    m_node = toShadowRoot(m_node)->host();
    m_distributedNode = m_node;
    m_isVisitingInsertionPointInReprojection = false;
}

} // namespace