问如何为视频播放器中的按钮留下底部空间（JavaFX）？

EN

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaView;
import javafx.stage.Stage;

// Removed implementation of EventHandler as it's not needed
public class VideoTest extends Application {

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

    @Override
    public void start(Stage primaryStage) throws Exception {

        // Create the overall container that will hold everything else
        VBox rootPane = new VBox(5);        // Separates all children by 5px
        rootPane.setAlignment(Pos.CENTER);
        rootPane.setPadding(new Insets(5)); // Adds 5px padding around the window
        rootPane.setStyle("-fx-background-color: black");

        // Create the control buttons
        Button btnPlay = new Button(">");
        Button btnPause = new Button("||");

        // Create the container for the video itself
        VBox paneVideo = new VBox();

        // Create the media player and media player view
        MediaPlayer player = new MediaPlayer(
                new Media(getClass().getResource("movie.mp4").toExternalForm())
        );
        MediaView mediaView = new MediaView(player);

        // Bind the player to the bounds of the window; there is no need to do this in a separate method
        mediaView.fitWidthProperty().bind(primaryStage.widthProperty());
        mediaView.fitHeightProperty().bind(primaryStage.heightProperty());

        // Add the media player to the video pane
        paneVideo.getChildren().add(mediaView);

        // Setup the actions for the buttons. These should point to their own methods instead of
        // trying to determine which button was clicked later.
        btnPlay.setOnAction(e -> player.play());
        btnPause.setOnAction(e -> player.pause());

        // Create the HBox to hold the buttons
        HBox paneControlButtons = new HBox(10);
        paneControlButtons.setAlignment(Pos.CENTER);    // Centers the buttons in the scene
        paneControlButtons.setPadding(new Insets(5));

        // Add the buttons to their container
        paneControlButtons.getChildren().addAll(btnPlay, btnPause);

        // Add the buttons pane to the video pane so they appear when in fullscreen as well
        paneVideo.getChildren().add(paneControlButtons);

        // Add all the elements to the layout
        rootPane.getChildren().addAll(
                paneVideo
        );

        // Build the scene
        Scene scene = new Scene(rootPane, 700, 600);

        // Assemble the stage and show it
        primaryStage.setScene(scene);
        primaryStage.setFullScreen(true);   // Starts the player in fullscreen mode
        primaryStage.show();

        // I am omitting the slider for this example and also removing your second call to show
        // the primaryStage.
    }

}

// Create the control buttons
        Button btnPlay = new Button(">");
        btnPlay.setStyle("-fx-opacity: 0.4");
        Button btnPause = new Button("||");
        btnPause.setStyle("-fx-opacity: 0.4");

        // Style the buttons to be dim until moused over
        btnPlay.setOnMouseEntered(mouseEvent -> btnPlay.setStyle("-fx-opacity: 1.0"));
        btnPlay.setOnMouseExited(mouseEvent -> btnPlay.setStyle("-fx-opacity: 0.4"));
        btnPause.setOnMouseEntered(mouseEvent -> btnPause.setStyle("-fx-opacity: 1.0"));
        btnPause.setOnMouseExited(mouseEvent -> btnPause.setStyle("-fx-opacity: 0.4"));