JavaFX-¿Cómo usar un método en un controlador desde otro controlador?

controller javafx-8

Question

Trabajando con SceneBuilder. Tengo 2 etapas, cada una con un controlador:
stage1Controller ,
stage2Controller .
Stage1Controller:

public class Stage1Controller {
@FXML
private MenuItem translate;
@FXML
private Menu file;
@FXML
private Menu edit;
@FXML
private Menu help;
@FXML
private void handleTranslate (ActionEvent event){
translateFirstStage();
//HOW TO ACCESS THE stage2Controller setLabel()??
}
private void translateFirstStage(){
file.setText("Fichier");
edit.setText("Modifier");
help.setText("Aide");
}
}

Stage2Controller:

public class Stage2Controller {
@FXML
private Label lb;
private void setLabel(String string){
lb.setText("string");
}
}

Así es como se cargan ambos archivos fxml en la clase Main.java usando 2 métodos
(llamado en el método Start(Stage primaryStage) ):

public void firstStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage1.fxml"));
rootLayout = (BorderPane) loader.load();
// Show the scene containing the root layout.
Scene scene = new Scene(rootLayout);
primaryStage.setScene(scene);
primaryStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
public void secondStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage2.fxml"));
XD = (AnchorPane) loader.load();
// Show the scene containing the root layout.
Scene scene = new Scene(XD);
Stage stage = new Stage();
stage.setScene(scene);
stage.show();
} catch (IOException e) {
e.printStackTrace();
}
}

• El handleTranslate(ActionEvent event) se utiliza como un método OnAction para la MenuItem translate en la primera etapa, traduce la vista en ambas etapas.
  

¿Cómo puedo poner setLabel en el método handleTranslate ? Gracias

Answer 1

La forma "rápida y sucia" es darle al Stage1Controller una referencia al Stage2Controller :

public class Stage1Controller {
private final Stage2Controller stage2Controller ;
public void setStage2Controller(Stage2Controller stage2Controller) {
this.stage2Controller = stage2Controller ;
}
// ...
@FXML
private void handleTranslate (ActionEvent event){
translateFirstStage();
stage2Controller.setLabel(...);
}
// other code as before ...
}

Ahora en tu aplicación principal:

public class MainApp extends Application {
private Stage1Controller stage1Controller ;
private Stage2Controller stage2Controller ;
@Override
public void start(Stage primaryStage) {
firstStage();
secondStage();
stage1Controller.setStage2Controller(stage2Controller);
// ...
}
public void firstStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage1.fxml"));
rootLayout = (BorderPane) loader.load();
stage1Controller = loader.getController();
// Show the scene containing the root layout.
Scene scene = new Scene(rootLayout);
primaryStage.setScene(scene);
primaryStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
public void secondStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage2.fxml"));
XD = (AnchorPane) loader.load();
stage2Controller = loader.getController();
// Show the scene containing the root layout.
Scene scene = new Scene(XD);
Stage stage = new Stage();
stage.setScene(scene);
stage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
// ...
}

Sin embargo, un enfoque más sólido para esto es permitir que ambos controladores accedan a una clase de modelo compartida, almacenando los datos. Si representa los datos utilizando propiedades observables JavaFX, los controladores pueden escuchar los cambios en las propiedades que les interesan. Por ejemplo:

public class Model {
private final StringProperty text = new SimpleStringProperty("Initial text...");
public StringProperty textProperty() {
return text ;
}
public final void setText(String text) {
textProperty().set(text);
}
public final String getText() {
return textProperty().get();
}
// other properties as needed...
}

Ahora sus controladores se verán así:

public class Stage1Controller {
private Model model ;
public void setModel(Model model) {
this.model = model ;
}
@FXML
private void handleTranslate (ActionEvent event){
translateFirstStage();
model.setText(...); // value will appear in stage2 controller''s label!
}
// ...
}

y

public class Stage2Controller {
@FXML
private Label lb ;
private Model model ;
public void setModel(Model model) {
lb.textProperty().unbind();
this.model = model ;
lb.textProperty().bind(model.textProperty());
}
// ...
}

Y en este caso su aplicación principal se ve así:

public class MainApp extends Application {
private final Model = new Model();
@Override
public void start(Stage primaryStage) {
// ...
}
public void firstStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage1.fxml"));
rootLayout = (BorderPane) loader.load();
Stage1Controller controller = loader.getController();
controller.setModel(model);
// Show the scene containing the root layout.
Scene scene = new Scene(rootLayout);
primaryStage.setScene(scene);
primaryStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
public void secondStage() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(Main.class.getResource("view/stage2.fxml"));
XD = (AnchorPane) loader.load();
Stage2Controller controller = loader.getController();
controller.setModel(model);
// Show the scene containing the root layout.
Scene scene = new Scene(XD);
Stage stage = new Stage();
stage.setScene(scene);
stage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
}