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30 
31 #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_INERT_EFFECT_H_
32 #define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_INERT_EFFECT_H_
33 
34 #include "third_party/blink/renderer/core/animation/animation_effect.h"
35 #include "third_party/blink/renderer/core/animation/keyframe_effect_model.h"
36 #include "third_party/blink/renderer/core/core_export.h"
37 
38 namespace blink {
39 
40 // Lightweight subset of KeyframeEffect.
41 // Used to transport data for deferred KeyframeEffect construction and one off
42 // Interpolation sampling.
43 class CORE_EXPORT InertEffect final : public AnimationEffect {
44  public:
45   InertEffect(KeyframeEffectModelBase*,
46               const Timing&,
47               bool paused,
48               base::Optional<double> inherited_time,
49               base::Optional<TimelinePhase> inherited_phase);
50 
51   void Sample(HeapVector<Member<Interpolation>>&) const;
Model()52   KeyframeEffectModelBase* Model() const { return model_.Get(); }
Paused()53   bool Paused() const { return paused_; }
54 
IsInertEffect()55   bool IsInertEffect() const final { return true; }
56 
57   void Trace(Visitor*) const override;
58 
59  protected:
UpdateChildrenAndEffects()60   void UpdateChildrenAndEffects() const override {}
61   AnimationTimeDelta CalculateTimeToEffectChange(
62       bool forwards,
63       base::Optional<double> inherited_time,
64       AnimationTimeDelta time_to_next_iteration) const override;
65 
66  private:
67   Member<KeyframeEffectModelBase> model_;
68   bool paused_;
69   base::Optional<double> inherited_time_;
70   base::Optional<TimelinePhase> inherited_phase_;
71 };
72 
73 template <>
74 struct DowncastTraits<InertEffect> {
75   static bool AllowFrom(const AnimationEffect& animationEffect) {
76     return animationEffect.IsInertEffect();
77   }
78 };
79 
80 }  // namespace blink
81 
82 #endif
83