Nodes that apply layout constraints to their children should override this method and do the layout there.
This method gets called whenever Piccolo determines that this node's children may need to be re-layed out. This occurs when the bounds of this node or a descendent node change. This method may also be invoked indirectly when LayoutChildren is called on an ancestor node, since typically you will modify the bounds of the children there.
PNode Class | UMD.HCIL.Piccolo Namespace