1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef UI_COMPOSITOR_LAYER_ANIMATOR_COLLECTION_H_
6#define UI_COMPOSITOR_LAYER_ANIMATOR_COLLECTION_H_
7
8#include <set>
9
10#include "base/callback.h"
11#include "base/memory/ref_counted.h"
12#include "base/time/time.h"
13#include "ui/compositor/compositor_animation_observer.h"
14#include "ui/compositor/compositor_export.h"
15
16namespace ui {
17
18class Compositor;
19class LayerAnimator;
20
21// A collection of LayerAnimators that should be updated at each animation step
22// in the compositor.
23class COMPOSITOR_EXPORT LayerAnimatorCollection
24    : public CompositorAnimationObserver {
25 public:
26  explicit LayerAnimatorCollection(Compositor* compositor);
27  virtual ~LayerAnimatorCollection();
28
29  void StartAnimator(scoped_refptr<LayerAnimator> animator);
30  void StopAnimator(scoped_refptr<LayerAnimator> animator);
31
32  bool HasActiveAnimators() const;
33
34  base::TimeTicks last_tick_time() const { return last_tick_time_; }
35
36  // CompositorAnimationObserver:
37  virtual void OnAnimationStep(base::TimeTicks timestamp) OVERRIDE;
38
39 private:
40  Compositor* compositor_;
41  base::TimeTicks last_tick_time_;
42  std::set<scoped_refptr<LayerAnimator> > animators_;
43
44  DISALLOW_COPY_AND_ASSIGN(LayerAnimatorCollection);
45};
46
47}  // namespace ui
48
49#endif  // UI_COMPOSITOR_LAYER_ANIMATOR_COLLECTION_H_
50