在stage.show（）之后向窗格添加子级

Question

我正在用JavaFX编写一个简单的游戏应用程序，并试图实现重启游戏功能。我最初的想法是拿走gameView窗格，移除它的孩子，然后重新添加干净的。出于某种原因，这行不通。在舞台已经显示后，是否有其他方法在场景中的窗格中添加/移除儿童？

public void start(Stage primaryStage) {
    guessedLetters = new ArrayList<>();
    wrongGuesses = new ArrayList<>();

    gameView = getPane();

    primaryStage.setTitle("Hangman");
    Scene scene = new Scene(gameView);
    primaryStage.setScene(scene);
    //primaryStage.setResizable(false);
    primaryStage.show();
    primaryStage.setMinHeight(scene.getHeight());
    primaryStage.setMinWidth(scene.getWidth());
    primaryStage.sizeToScene();
}

 private void reset() {
            numMistakes = 0;
            guessedLetters.clear();
            wrongGuesses.clear();
            gameView.getChildren().clear();
            gameView = getPane();
            // ToDo: figure out how to reset pane
        }

private BorderPane getPane() {
    // Text-input section
    lblInput = new Label("Guess a letter: ");
    tfInput = new TextField();

    tfInput.setOnAction(e -> play());
    guessInput = new HBox();
    guessInput.getChildren().addAll(lblInput, tfInput);
    guessInput.setAlignment(Pos.CENTER);


    gallows = new Gallows();
    gameBoard = buildGameBoard();
    centerScreen = new VBox();
    centerScreen.getChildren().addAll(gallows, gameBoard, guessInput);
    centerScreen.setSpacing(10);
    centerScreen.setAlignment(Pos.CENTER);
    centerScreen.setPadding(new Insets(5, 5, 5, 5));
    lblOutput = new Label();
    lblOutput.setFont(Font.font("Georgia", 15));

    gameView = new BorderPane();
    gameView.setCenter(centerScreen);
    gameView.setBottom(lblOutput);
    BorderPane.setAlignment(lblOutput, Pos.CENTER);

    return gameView;
}

欢迎提出任何建议。

Answer 1

试试这个

Stage stage = (Stage) gameView.getScene().getWindow();
gameView = getPane();
stage.setScene(gameView);

边问：为什么getpane返回gameview，尽管gameview似乎是该方法的成员变量而不是局部变量？