关于esc的JavaFx关闭窗口？

Question

我在我的程序中调用了一个新阶段,我希望在按下escape时关闭.我这样做了,它给了我一个NullPointerException:

    scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
        @Override
        public void handle(KeyEvent t) {
            KeyCode key = t.getCode();
            if (key == KeyCode.ESCAPE){
                stage.close();
            }
        }
    });

Answer 1

试试这个..

  scene.addEventHandler(KeyEvent.KEY_PRESSED, new EventHandler<KeyEvent>
  () {

        @Override
        public void handle(KeyEvent t) {
          if(t.getCode()==KeyCode.ESCAPE)
          {
              System.out.println("click on escape");
           Stage sb = (Stage)label.getScene().getWindow();//use any one object
           sb.close();
          }
        }
    });

Answer 2

将事件处理程序添加到要在ESC上关闭的阶段/窗口.

JavaFX 8风格:

    stage.addEventHandler(KeyEvent.KEY_RELEASED, (KeyEvent event) -> {
        if (KeyCode.ESCAPE == event.getCode()) {
            stage.close();
        }
    });

Answer 3

为什么你不向我们展示更多你的代码？不过，试试这个：

public class Login extends Application {

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

@Override
public void start(final Stage primaryStage) {
    primaryStage.setTitle("JavaFX Welcome");
    GridPane grid = new GridPane();
    grid.setAlignment(Pos.CENTER);
    grid.setHgap(10);
    grid.setVgap(10);
    grid.setPadding(new Insets(25, 25, 25, 25));

    Text scenetitle = new Text("Welcome");
    scenetitle.setId("welcome-text");
    grid.add(scenetitle, 0, 0, 2, 1);

    Label userName = new Label("User Name:");
    grid.add(userName, 0, 1);

    TextField userTextField = new TextField();
    grid.add(userTextField, 1, 1);

    Label pw = new Label("Password:");
    grid.add(pw, 0, 2);

    PasswordField pwBox = new PasswordField();
    grid.add(pwBox, 1, 2);

    Button btn = new Button("Sign in");
    HBox hbBtn = new HBox(10);
    hbBtn.setAlignment(Pos.BOTTOM_RIGHT);
    hbBtn.getChildren().add(btn);
    grid.add(hbBtn, 1, 4);

    Scene scene = new Scene(grid, 660, 300);
    scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
        public void handle(KeyEvent ke) {
            if (ke.getCode() == KeyCode.ESCAPE) {
                System.out.println("Key Pressed: " + ke.getCode());
                primaryStage.close();
            }
        }
    });
    //primaryStage.setFullScreen(true);
    primaryStage.setScene(scene);
    primaryStage.show();
}
}

完毕。