JavaFX FXML控制器密钥处理程序代码不起作用

Question

我有FXML和keyPress处理程序的问题.

我尝试设置按键简单测试,但不调用键处理程序.鼠标处理等工作正常,但键处理没有.

我尝试在Pane上设置KeyHandler,圆圈(在Pane中)和场景.

public class Controller implements Initializable {
    public Pane canvas;
    public Label yDisplay;
    public Label xDisplay;
    public Circle circle;

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        canvas.setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent keyEvent) {
                System.out.println("Test");
            }
        });
    }
}

尊重Dil,thx为你的答案,但我想做一些"游戏",在窗格上的简单圆圈,通过按键在键盘上移动.当然,专注于compmonent会起作用.但没有专注.也许必须在窗口或场景上设置关键监听器？我为目的模糊而道歉.

我尝试按下按钮,但初始化中的场景为空.

public class Controller implements Initializable {
    @FXML private Pane canvas;
    @FXML private Label yDisplay;
    @FXML private Label xDisplay;
    @FXML private Circle circle;

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        canvas.getScene().setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent keyEvent) {
                System.out.println("Work");
            }
        });
        canvas.setOnMousePressed(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent mouseEvent) {
                canvas.getChildren().add(new Bullet(150.0, 150.0, mouseEvent.getX(), mouseEvent.getY()));
            }
        });
    }
}

这是逻辑,我试图在Apllication类中设置.在Application上设置密钥处理程序,它的工作正常!但是,如何获得Circle和场景的其他组件,因为他们在controlle.class中使用了kepp

  @Override
    public void start(Stage primaryStage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root));
        primaryStage.getScene().setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent keyEvent) {
                System.out.println("HEY");
            }
        });
        primaryStage.show();
    }

现在我把它与查看场景/父根相关联

是! 查找Parent是有效的.我只需按#+"id"搜索

 @Override
    public void start(Stage primaryStage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root));
        primaryStage.getScene().setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent keyEvent) {
                System.out.println("HEY");
                Circle myCirecle = (Circle) root.lookup("#circle");
                myCirecle.setTranslateY(10.0);
            }
        });
        primaryStage.show();
    }

Answer 1

您的代码没有问题.我测试了这段代码,它对我没有任何改变.问题可能与您的使用有关.为什么要将KeyPress监听器添加到整个窗格而不是某些组件？除非未选择容器/窗格,否则无法识别按键.如果按下键按下,则在fxml中添加一个TextField

 @FXML
private TextField testTextField;

并在initialize()函数中添加以下代码

testTextField.setOnKeyPressed(new EventHandler<KeyEvent>() {

        @Override
        public void handle(KeyEvent arg0) {
            // TODO Auto-generated method stub
            System.out
                    .println("MyController.initialize().new EventHandler() {...}.handle()");

        }
    });

注意:您还应该在fxml中添加文本字段,而不仅仅是在控制器中添加上面的代码.