在控制器中调用视图方法

Question

我想在控制器中调用视图方法,但我不知道如何:)我寻求的例子,但我没有找到它.我可以在这段代码中执行此操作吗？我是否必须重新建造它？我使用javafx和fxml技术(构建用户界面).

我的视图文件(它有gotoRegister()和gotoLogin()方法(我想调用它们))

public class FXMLExampleMVC extends Application{

    protected Parent root;
    @Override
    public void start(Stage stage) throws Exception {
        gotoLogin();

        Scene scene = new Scene(root);

        stage.setScene(scene);
        stage.setTitle("JavaFX Welcome!");
        scene.getStylesheets().add(FXMLExampleMVC.class.getResource("cssforapp.css").toExternalForm());

        stage.show();
    }

    public void gotoRegister() throws IOException{
        root = FXMLLoader.load(getClass().getResource("RegisterFXML.fxml"));  
    }
    public void gotoLogin() throws IOException{
        root = FXMLLoader.load(getClass().getResource("Sample.fxml"));
    }

    public static void main(String[] args) {
      launch(args);  
    }
}

我的控制器(这里我想调用gotoRegister()方法)

public class SampleController {

    public SampleModel model = new SampleModel();
    @FXML
    protected Text actiontarget;
    @FXML
    protected PasswordField passwordField;
    @FXML
    protected TextField loginField;

    @FXML protected void handleSubmitButtonAction(){
        if((loginField.getText().equals(model.returnLogin()))&&(passwordField.getText().equals(model.returnPass())) ){
            actiontarget.setText("You have access !");
        } else {
           actiontarget.setText("Wrong data !"); 
        }

    }
    @FXML protected void handleSubmitButtonRegister() throws IOException{
        // 
       //Here I want to invoke gotoRegister
      //
    }
}

我的问题:我可以调用gotoRegister吗？或者,也许是改变fxml文件(从控制器)的其他方式？

Answer 1

将此代码放在FXMLExampleMVC.java中

private static FXMLExampleMVC instance;
public FXMLExampleMVC() {
           instance = this;
}
// static method to get instance of view
public static FXMLExampleMVC getInstance() {
        return instance;
}

现在你可以像这样在控制器中调用你的视图方法

  @FXML protected void handleSubmitButtonRegister() throws IOException{
        // 
       //Here I want to invoke gotoRegister
        FXMLExampleMVC.getInstance().gotoRegister();
    }