How to get label.getWidth() in javafx

Question

always when i try to get the width of an Array in Java it just returns 0 and i dont know why. Can somebody explain to me how it is done right?

Answer 1

To get the width you need to call prefWidth(-1) and prefHeight(-1) the layout bounds are only set once the control is layouted through resizeRelocate

To get the correct width before the stage is shown you also need to call impl_processCSS(true) which is an NONE public API but there's nothing better at the moment IIRC

 HBox h = new HBox();
 Label l = new Label("Hello");
 h.getChildren().add(l);
 Scene s = new Scene(h);
 l.impl_processCSS(true);
 System.err.println(l.prefWidth(-1)+"/"+l.prefHeight(-1));