java JavaFX 类控制器舞台/窗口参考

JavaFX Class controller Stage/Window reference

提问by nailujed

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

有没有办法从关联的类控制器获取 FXML 加载文件的 Stage/Window 对象？

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

特别是，我有一个用于模态窗口的控制器，我需要舞台来关闭它。

回答by nailujed

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

我找不到这个问题的优雅解决方案。但我找到了这两种选择：

• 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.

• 从场景中的节点获取窗口引用

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

• 在加载 FXML 时将 Window 作为参数传递给控制器​​。

  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);
  
  ...
  

  并且 FormController 必须实现 setStage 方法。

回答by Jinu P C

@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

另一种方法是为舞台定义一个静态 getter 并访问它

Main Class

主班

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

现在您可以通过调用访问此阶段

Main.getPrimaryStage()

Main.getPrimaryStage()

In Controller Class

在控制器类中

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