Box, Row and the rest return descriptors, and BoxNode is exported as a type only — so a
descriptor is the only one of these a consumer outside the package can actually build. The chart
appends the result to a live tree, and builds a descriptor into a node on the way.
What a chart's item callbacks may hand back.
Box,Rowand the rest return descriptors, andBoxNodeis exported as a type only — so a descriptor is the only one of these a consumer outside the package can actually build. The chart appends the result to a live tree, and builds a descriptor into a node on the way.