chromium/content/browser/renderer_host/overscroll_controller.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_H_
#define CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_H_

#include <optional>

#include "base/time/time.h"
#include "cc/input/overscroll_behavior.h"
#include "content/common/content_export.h"
#include "third_party/blink/public/common/input/web_gesture_event.h"
#include "third_party/blink/public/common/input/web_input_event.h"
#include "ui/events/blink/did_overscroll_params.h"

namespace content {

class OverscrollControllerDelegate;
class OverscrollControllerTest;
class RenderWidgetHostViewAuraOverscrollTest;

// Indicates the direction that the scroll is heading in relative to the screen,
// with the top being NORTH.
enum OverscrollMode { … };

// Indicates the source device that was used to trigger the overscroll gesture.
enum class OverscrollSource { … };

// When a page is scrolled beyond the scrollable region, it will trigger an
// overscroll gesture. This controller receives the events that are dispatched
// to the renderer, and the ACKs of events, and updates the overscroll gesture
// status accordingly.
// Exported for testing.
class CONTENT_EXPORT OverscrollController { … };

}  // namespace content

#endif  // CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_H_