UIHierarchy is a library that facilitates creation of user interfaces. The main idea is to enforce the mental picture of the containment hierarchy of GUI components by writing the code in the same logical way. Code gets much easier to understand, much shorter, and easy to maintain. Additionaly, UIHierarchy can manipulate resulting components hierarchies in a powerful way.

It greatly simplifies the use of layout managers and exposes the containment hierarchy in the code as a hierarchy.

Due to the hierarchical nature of UIHierarchy, the library provides ways to manipulate the levels of the resulting hierarchies, like adding/removing new levels or enabling/disabling many components at once.
It also adds capabilities like the use of units (centimeters, dlus, etc.) in addition to traditional pixel handling.

The license terms are LGPL 2.1.