import javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.shape.Circle; import javafx.stage.Stage; public class ...
However is it possible to change the :root without using state? If the stage, which is a fn-fx.diff.Component was instead a map then this would be possible: (swap! (atom {:scene {:root nil}}) assoc-in ...