Working with SceneBuilder. I have 2 stages, each one with a controller:
stage1Controller
,stage2Controller
.
Stage1Controller
The "quick and dirty" way is to give the Stage1Controller
a reference to the 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 ...
}
Now in your main app:
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();
}
}
// ...
}
A more robust approach to this, though, is to let both controllers access a shared model class, storing the data. If you represent the data using JavaFX observable properties, the controllers can listen for changes on the properties they care about. For example:
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...
}
Now your controllers will look like this:
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!
}
// ...
}
and
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());
}
// ...
}
And in this case your main app looks like:
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();
}
}
}