chromium/cc/animation/scroll_timeline.h

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_ANIMATION_SCROLL_TIMELINE_H_
#define CC_ANIMATION_SCROLL_TIMELINE_H_

#include <optional>
#include <vector>

#include "base/time/time.h"
#include "cc/animation/animation_export.h"
#include "cc/animation/animation_timeline.h"
#include "cc/animation/keyframe_model.h"
#include "cc/paint/element_id.h"

namespace cc {

class ScrollTree;

// A ScrollTimeline is an animation timeline that bases its current time on the
// progress of scrolling in some scroll container.
//
// This is the compositor-side representation of the web concept expressed in
// https://wicg.github.io/scroll-animations/#scrolltimeline-interface.
class CC_ANIMATION_EXPORT ScrollTimeline : public AnimationTimeline { … };

inline ScrollTimeline* ToScrollTimeline(AnimationTimeline* timeline) { … }

inline const ScrollTimeline* ToScrollTimeline(
    const AnimationTimeline* timeline) { … }

}  // namespace cc

#endif  // CC_ANIMATION_SCROLL_TIMELINE_H_