MeasurePolicy
How a container measures and places its children.
A policy is handed one Measurable per child and the Constraints the container was given, measures each child under constraints of its own working out, and answers with the extent it occupies and the placement of what it measured.
Functions
The height beyond which growing measurables no longer reduces their width at width.
The width beyond which growing measurables no longer reduces their height at height.
Measures measurables under constraints and answers the extent this container occupies, along with where each measured child goes inside it.
The smallest height that lets measurables paint correctly when they are width wide.
The smallest width that lets measurables paint correctly when they are height tall.