How to know if an instance of a class has been brought to the stage?

Question

Java

Kind
How to check if an instance of a class, for example, Label, has been added to the display?

Answer 1

You can subscribe to the Node#sceneProperty property - the combination of values ​​newValue != null && oldValue == null will indicate that the entire graph of controls is displayed on the screen (BorderPane->FlowPane(center)->VBox(#3)->Label, Button just subscribe to BorderPane#sceneProperty)