Javafx MVC how to signal new threaded result from one controller to another - javafx

Question

I have a Javafx MVC Structure where Controller 1, 2, 3... are in charge of updating the UI elementes, and Super Controller executes whatever job is passed to it from them, and returns the result.
I have a Button Btn1 in Controller1 which when pressed will be disabled and show a processing symbol while the main job is done in other thread whose function is present in Super Controller. Once that thread completes its job, it'll notify the calling function that job is done, so that Btn1 will be enabled again, and processing symbol removed.
CONTROLLER1
#FXML
Button Btn1;
private ProgressIndicator loading;
private SUPERCONTROLLER con;
#Override
public void initialize(URL url, ResourceBundle rb){
loading=new javafx.scene.control.ProgressIndicator();
loading.setProgress(javafx.scene.control.ProgressIndicator.INDETERMINATE_PROGRESS);
}
#FXML
private void press(MouseEvent evt){
Btn1.setDisable(true);
Btn1.setGraphic(loading);
Task<Integer>t=this.con.Action();
new Thread(t).start();
t.setOnSuceeded(e->{
if(t.getValue()==0){
System.out.println("Success");
}else{
System.out.println("falure");
}
Btn1.setDisable(false);
Btn1.setGraphic(null);
});
}
private void inject(SUPERCONTROLLER c){
this.con=c;
}
SUPERCONTROLLER
#FXML
private VBox sidePane;
#Override
public void initialize(URL url,ResourceBundle rb){
var fxml=new FXMLLoader(getClass().getResource("CONTROLLER1.fxml");
Pane childPanel=fxml.load();
sidePane.getChildren().add(childPanel);
CONTROLLER1 childPanel.getController();
CONTROLLER1.inject(this);
}
protected Task<Integer> Action(){
Task<Integer>task=new Task<>(){
#Override protected Integer call(){
Thread.currentThread.wait(3000); //Imitate long task
return 0;
}
}
return task;
}
However, I want the thread concept to stay in Super Controller itself. i.e., Instead of setting suceeded operation in Controller1, I want to move it to Super Controller and Controller1 should just re-enable the button when Super Controller tells it.