File: ProgrammaticScrollAnimator.h

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// Copyright 2014 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.

#ifndef ProgrammaticScrollAnimator_h
#define ProgrammaticScrollAnimator_h

#include "platform/heap/Handle.h"
#include "platform/scroll/ScrollAnimatorCompositorCoordinator.h"
#include "wtf/Allocator.h"
#include "wtf/Noncopyable.h"
#include <memory>

namespace blink {

class ScrollableArea;
class CompositorAnimationTimeline;
class CompositorScrollOffsetAnimationCurve;

// Animator for fixed-destination scrolls, such as those triggered by
// CSSOM View scroll APIs.
class ProgrammaticScrollAnimator : public ScrollAnimatorCompositorCoordinator {
  WTF_MAKE_NONCOPYABLE(ProgrammaticScrollAnimator);

 public:
  static ProgrammaticScrollAnimator* create(ScrollableArea* scrollableArea) {
    return new ProgrammaticScrollAnimator(scrollableArea);
  }

  virtual ~ProgrammaticScrollAnimator();

  void scrollToOffsetWithoutAnimation(const ScrollOffset&);
  void animateToOffset(const ScrollOffset&);

  // ScrollAnimatorCompositorCoordinator implementation.
  void resetAnimationState() override;
  void cancelAnimation() override;
  void takeOverCompositorAnimation() override{};
  ScrollableArea* getScrollableArea() const override {
    return m_scrollableArea;
  }
  void tickAnimation(double monotonicTime) override;
  void updateCompositorAnimations() override;
  void notifyCompositorAnimationFinished(int groupId) override;
  void notifyCompositorAnimationAborted(int groupId) override{};
  void layerForCompositedScrollingDidChange(
      CompositorAnimationTimeline*) override;

  DECLARE_TRACE();

 private:
  explicit ProgrammaticScrollAnimator(ScrollableArea*);

  void notifyOffsetChanged(const ScrollOffset&);

  Member<ScrollableArea> m_scrollableArea;
  std::unique_ptr<CompositorScrollOffsetAnimationCurve> m_animationCurve;
  ScrollOffset m_targetOffset;
  double m_startTime;
};

}  // namespace blink

#endif  // ProgrammaticScrollAnimator_h