Extending Builders: Layout Builders

[Tom Eugelink]

> And I have a working proposal for the constraints-for-multiple-different-layout-managers in the JFXtras versions: each layout holds the contraints in a WeakHashmap<Node, Constaint>. As soon as a Node is no longer referenced, all its constraints are cleared. And this has another advantage: you can have different constaints; so a node can be left aligned in one layout and right aligned in the other.

Naturally this weak reference is only used in the multiple layout use case. Normally the constraint is removed immediately when the node is removed from the children.

Tom