System/Library/PrivateFrameworks/Silex.framework

SXArticleScrollEvent.h

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1. NSObject
2. >
3. SXAnalyticsEvent

@interface SXArticleScrollEvent : SXAnalyticsEvent

@property (nonatomic) double startPosition;
@property (nonatomic) double endPosition;
@property (nonatomic) double targetPosition;
@property (nonatomic) double velocity;

@end