JavaFX类控制器阶段/窗口引用

Question

Is there any way of getting the Stage/Window object of an FXML loaded file from the associated class controller?

Particularly, I have a controller for a modal window and I need the Stage to close it.

Answer 1

I could not find an elegant solution to the problem. But I found these two alternatives:

• Getting the window reference from a Node in the Scene

   @FXML private Button closeButton ; public void handleCloseButton() { Scene scene = closeButton.getScene(); if (scene != null) { Window window = scene.getWindow(); if (window != null) { window.hide(); } } } 

• Passing the Window as an argument to the controller when the FXML is loaded.

   String resource = "/modalWindow.fxml"; URL location = getClass().getResource(resource); FXMLLoader fxmlLoader = new FXMLLoader(); fxmlLoader.setLocation(location); fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory()); Parent root = (Parent) fxmlLoader.load(); controller = (FormController) fxmlLoader.getController(); dialogStage = new Stage(); controller.setStage(dialogStage); ... 

  And FormController must implement the setStage method.

Answer 2

@FXML
private Button closeBtn;
Stage currentStage = (Stage)closeBtn.getScene().getWindow();
currentStage.close();

Another way is define a static getter for the Stage and Access it

Main Class

public class Main extends Application {
    private static Stage primaryStage; // **Declare static Stage**

    private void setPrimaryStage(Stage stage) {
        Main.primaryStage = stage;
    }

    static public Stage getPrimaryStage() {
        return Main.primaryStage;
    }

    @Override
    public void start(Stage primaryStage) throws Exception{
        setPrimaryStage(primaryStage); // **Set the Stage**
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root, 300, 275));
        primaryStage.show();
    }
}

Now you Can access this stage by calling

Main.getPrimaryStage()

In Controller Class

public class Controller {
public void onMouseClickAction(ActionEvent e) {
    Stage s = Main.getPrimaryStage();
    s.close();
}
}