animation_player.h

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

#include <memory>
#include <optional>
#include <unordered_map>
#include <vector>

#include "flutter/fml/hash_combine.h"
#include "flutter/fml/macros.h"
#include "flutter/fml/time/time_delta.h"
#include "impeller/base/timing.h"
#include "impeller/geometry/matrix.h"
#include "impeller/scene/animation/animation_clip.h"

namespace impeller {
namespace scene {

class Node;

class AnimationPlayer final {
 public:
  AnimationPlayer();
  ~AnimationPlayer();

  AnimationPlayer(AnimationPlayer&&);
  AnimationPlayer& operator=(AnimationPlayer&&);

  AnimationClip& AddAnimation(std::shared_ptr<Animation> animation,
                              Node* bind_target);

  /// @brief  Advanced all clips and updates animated properties in the scene.
  void Update();

  /// @brief  Reset all bound animation target transforms.
  void Reset();

 private:
  std::unordered_map<Node*, Matrix> default_target_transforms_;

  std::vector<AnimationClip> clips_;

  std::optional<TimePoint> previous_time_;

  FML_DISALLOW_COPY_AND_ASSIGN(AnimationPlayer);
};

}  // namespace scene
}  // namespace impeller