HBox 和 VBox 中的中心对象 (JavaFx)

Center objects in HBox and VBox (JavaFx)

我正在为我的一项作业制作一个简单的 GUI。我创建了一个裸机界面,但目前遇到了一些问题。该程序显示一切正常,只是我想让对象居中,这样看起来更整洁。我尝试的是将按钮(属于底部)放在 borderPane 上,并使用 setCetner 方法将其与中心对齐,但这什么也没做。有没有其他方法可以尝试将我的所有对象置于窗格的中心?

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Main extends Application {

    private TextField startDate;
    private Text start;
    private Text end;
    private TextField endDate;
    private Button count;

    @Override
    public void start(Stage primaryStage) {

        start = new Text("Start Date: ");
        end = new Text("End Date: ");

        startDate = new TextField("1/1/2000");
        endDate = new TextField(getDate());

        count = new Button("Count");

        HBox startLine = new HBox(10);
        startLine.getChildren().addAll(start, startDate);


        HBox endLine = new HBox(10);
        endLine.getChildren().addAll(end, endDate);

        HBox button = new HBox();
        button.getChildren().add(count);
        BorderPane borderPane = new BorderPane();
        borderPane.setCenter(button);


        VBox vbox = new VBox(10);
        vbox.getChildren().addAll(startLine, endLine, button);


        Pane root = new Pane();

        root.getChildren().addAll(vbox);

        Scene scene = new Scene(root, 400, 300);
        primaryStage.setTitle("Date Counter");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public String getDate(){
        DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
        Date date = new Date();
        return dateFormat.format(date);
    }

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

}

为了让 UI 看起来更好,我更喜欢 GridPane(例如 Text 字段对齐)

// set the "coordinates" of the nodes
GridPane.setConstraints(start, 0, 0);
GridPane.setConstraints(startDate, 1, 0);
GridPane.setConstraints(end, 0, 1);
GridPane.setConstraints(endDate, 1, 1);
// center button here
GridPane.setConstraints(count, 0, 2, 2, 1, HPos.CENTER, VPos.CENTER);

// some spacing, otherwise the nodes stick together
Insets spacing = new Insets(3d);
GridPane.setMargin(start, spacing);
GridPane.setMargin(startDate, spacing);
GridPane.setMargin(end, spacing);
GridPane.setMargin(endDate, spacing);
GridPane.setMargin(count, spacing);

// nodes to the grid
GridPane grid = new GridPane();
grid.getChildren().addAll(start, startDate, end, endDate, count);

Scene scene = new Scene(grid, 400, 300);

如果要使整个网格居中,则必须添加 grid.setAlignment(Pos.TOP_CENTER);