third_party/blink/renderer/core/page/scrolling/root_scroller_util.cc

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/core/page/scrolling/root_scroller_util.h"

#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/dom/node.h"
#include "third_party/blink/renderer/core/frame/local_frame_view.h"
#include "third_party/blink/renderer/core/layout/layout_box.h"
#include "third_party/blink/renderer/core/layout/layout_box_model_object.h"
#include "third_party/blink/renderer/core/layout/layout_view.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/core/page/scrolling/root_scroller_controller.h"
#include "third_party/blink/renderer/core/page/scrolling/top_document_root_scroller_controller.h"
#include "third_party/blink/renderer/core/paint/paint_layer.h"
#include "third_party/blink/renderer/core/paint/paint_layer_scrollable_area.h"

namespace blink {

namespace root_scroller_util {

PaintLayer* PaintLayerForRootScroller(const Node* node) {
  if (!node)
    return nullptr;

  if (!node->GetLayoutObject() || !node->GetLayoutObject()->IsBox())
    return nullptr;

  LayoutBox* box = ToLayoutBox(node->GetLayoutObject());
  return box->Layer();
}

}  // namespace root_scroller_util

}  // namespace blink