ui/compositor/layer_animator_collection.h

   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
  16 namespace ui {
  17
  18 class Compositor;
  19 class LayerAnimator;
  20
  21 // A collection of LayerAnimators that should be updated at each animation step
  22 // in the compositor.
  23 class COMPOSITOR_EXPORT LayerAnimatorCollection
  24     : public CompositorAnimationObserver {
  25  public:
  26   explicit LayerAnimatorCollection(Compositor* compositor);
  27   ~LayerAnimatorCollection() override;
  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   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_