cacheExtentStyle property
final
Controls how the cacheExtent is interpreted.
If set to CacheExtentStyle.pixel, the cacheExtent will be treated as a logical pixels, and the default cacheExtent is RenderAbstractViewport.defaultCacheExtent.
If set to CacheExtentStyle.viewport, the cacheExtent will be treated as a multiplier for the main axis extent of the viewport. In this case there is no default cacheExtent; it must be explicitly specified.
Implementation
final CacheExtentStyle cacheExtentStyle;