chromium/third_party/blink/renderer/platform/graphics/paint/scroll_paint_property_node.h

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

#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_PAINT_SCROLL_PAINT_PROPERTY_NODE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_PAINT_SCROLL_PAINT_PROPERTY_NODE_H_

#include <algorithm>
#include <optional>

#include "base/dcheck_is_on.h"
#include "base/notreached.h"
#include "cc/input/main_thread_scrolling_reason.h"
#include "cc/input/overscroll_behavior.h"
#include "cc/input/scroll_snap_data.h"
#include "third_party/blink/renderer/platform/graphics/compositor_element_id.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_property_node.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"

namespace blink {

class ClipPaintPropertyNode;

MainThreadScrollingReasons;

enum class CompositedScrollingPreference : uint8_t { … };

// A scroll node contains auxiliary scrolling information which includes how far
// an area can be scrolled, main thread scrolling reasons, etc. Scroll nodes
// are referenced by TransformPaintPropertyNodes that are used for the scroll
// offset translation, though scroll offset translation can exist without a
// scroll node (e.g., overflow: hidden).
//
// Main thread scrolling reasons force scroll updates to go to the main thread
// and can have dependencies on other nodes. For example, all parents of a
// scroll node with background attachment fixed set should also have it set.
//
// The scroll tree differs from the other trees because it does not affect
// geometry directly.
class PLATFORM_EXPORT ScrollPaintPropertyNode final
    : public PaintPropertyNodeBase<ScrollPaintPropertyNode,
                                   ScrollPaintPropertyNode> { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_PAINT_SCROLL_PAINT_PROPERTY_NODE_H_