third_party/WebKit/Source/core/animation/InertEffect.h

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#ifndef InertEffect_h
#define InertEffect_h

#include "base/memory/scoped_refptr.h"
#include "core/CoreExport.h"
#include "core/animation/AnimationEffectReadOnly.h"
#include "core/animation/KeyframeEffectModel.h"

namespace blink {

// Lightweight subset of KeyframeEffect.
// Used to transport data for deferred KeyframeEffect construction and one off
// Interpolation sampling.
class CORE_EXPORT InertEffect final : public AnimationEffectReadOnly {
 public:
  static InertEffect* Create(KeyframeEffectModelBase*,
                             const Timing&,
                             bool paused,
                             double inherited_time);
  void Sample(Vector<scoped_refptr<Interpolation>>&) const;
  KeyframeEffectModelBase* Model() const { return model_.Get(); }
  bool Paused() const { return paused_; }

  bool IsInertEffect() const final { return true; }

  void Trace(blink::Visitor*) override;

 protected:
  void UpdateChildrenAndEffects() const override {}
  double CalculateTimeToEffectChange(
      bool forwards,
      double inherited_time,
      double time_to_next_iteration) const override;

 private:
  InertEffect(KeyframeEffectModelBase*,
              const Timing&,
              bool paused,
              double inherited_time);
  Member<KeyframeEffectModelBase> model_;
  bool paused_;
  double inherited_time_;
};

DEFINE_TYPE_CASTS(InertEffect,
                  AnimationEffectReadOnly,
                  animationEffect,
                  animationEffect->IsInertEffect(),
                  animationEffect.IsInertEffect());

}  // namespace blink

#endif