third_party/WebKit/Source/core/css/resolver/ElementResolveContext.cpp

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
 * All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "core/css/resolver/ElementResolveContext.h"

#include "core/dom/LayoutTreeBuilderTraversal.h"
#include "core/dom/Node.h"
#include "core/dom/NodeComputedStyle.h"
#include "core/dom/V0InsertionPoint.h"
#include "core/dom/VisitedLinkState.h"

namespace blink {

ElementResolveContext::ElementResolveContext(const Document& document)
    : element_(nullptr),
      parent_node_(nullptr),
      layout_parent_(nullptr),
      root_element_style_(document.documentElement()
                              ? document.documentElement()->GetComputedStyle()
                              : document.GetComputedStyle()),
      element_link_state_(EInsideLink::kNotInsideLink),
      distributed_to_insertion_point_(false) {}

ElementResolveContext::ElementResolveContext(Element& element)
    : element_(&element),
      element_link_state_(
          element.GetDocument().GetVisitedLinkState().DetermineLinkState(
              element)),
      distributed_to_insertion_point_(false) {
  LayoutTreeBuilderTraversal::ParentDetails parent_details;
  if (element.CanParticipateInFlatTree()) {
    parent_node_ = LayoutTreeBuilderTraversal::Parent(element);
    layout_parent_ =
        LayoutTreeBuilderTraversal::LayoutParent(element, &parent_details);
  } else {
    parent_node_ = nullptr;
    layout_parent_ = nullptr;
  }
  distributed_to_insertion_point_ = parent_details.GetInsertionPoint();

  const Document& document = element.GetDocument();
  Node* document_element = document.documentElement();
  const ComputedStyle* document_style = document.GetComputedStyle();
  root_element_style_ = document_element && element != document_element
                            ? document_element->GetComputedStyle()
                            : document_style;
  if (!root_element_style_)
    root_element_style_ = document_style;
}

}  // namespace blink