JavaFX BorderPane

JavaFX教程 - JavaFX BorderPane

BorderPane布局顶，底，左，右或中心区域中的子节点。每个区域只能有一个节点。

BorderPane的顶部和底部区域允许可调整大小的节点占用所有可用宽度。

左边界区域和右边界区域占据顶部和底部边界之间的可用垂直空间。

默认情况下，所有边界区域尊重孩子们的首选宽度和高度。

放置在顶部，底部，左，右和中心区域中的节点的默认对齐方式如下:

• Top: Pos.TOP_LEFT
• Bottom: Pos.BOTTOM_LEFT
• Left: Pos.TOP_LEFT
• Right: Pos.TOP_RIGHT
• Center: Pos.CENTER

例子

将按钮添加到BorderPane

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

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

  @Override
  public void start(Stage primaryStage) {
    primaryStage.setTitle("BorderPane Test");
    BorderPane bp = new BorderPane();
    bp.setPadding(new Insets(10, 20, 10, 20));

    Button btnTop = new Button("Top");
    bp.setTop(btnTop);

    Button btnLeft = new Button("Left");
    bp.setLeft(btnLeft);

    Button btnCenter = new Button("Center");
    bp.setCenter(btnCenter);

    Button btnRight = new Button("Right");
    bp.setRight(btnRight);

    Button btnBottom = new Button("Bottom");
    bp.setBottom(btnBottom);

    Scene scene = new Scene(bp, 300, 200);
    primaryStage.setScene(scene);
    primaryStage.show();
  }
}

上面的代码生成以下结果。

实施例2

将BorderPane宽度和高度与场景绑定

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.layout.BorderPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class Main extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Title");
        Group root = new Group();
        Scene scene = new Scene(root, 400, 250, Color.WHITE);

        MenuBar menuBar = new MenuBar();
        EventHandler<ActionEvent> action = changeTabPlacement();

        Menu menu = new Menu("Direction");
        MenuItem left = new MenuItem("Left");

        left.setOnAction(action);
        menu.getItems().add(left);

        MenuItem right = new MenuItem("Right");
        right.setOnAction(action);
        menu.getItems().add(right);

        MenuItem top = new MenuItem("Top");
        top.setOnAction(action);
        menu.getItems().add(top);

        MenuItem bottom = new MenuItem("Bottom");
        bottom.setOnAction(action);
        menu.getItems().add(bottom);

        menuBar.getMenus().add(menu);

        BorderPane borderPane = new BorderPane();

        borderPane.prefHeightProperty().bind(scene.heightProperty());
        borderPane.prefWidthProperty().bind(scene.widthProperty());
        
        borderPane.setTop(menuBar);
        
        root.getChildren().add(borderPane);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private EventHandler<ActionEvent> changeTabPlacement() {
        return new EventHandler<ActionEvent>() {

            public void handle(ActionEvent event) {
                MenuItem mItem = (MenuItem) event.getSource();
                String side = mItem.getText();
                if ("left".equalsIgnoreCase(side)) {
                    System.out.println("left");
                } else if ("right".equalsIgnoreCase(side)) {
                    System.out.println("right");
                } else if ("top".equalsIgnoreCase(side)) {
                    System.out.println("top");
                } else if ("bottom".equalsIgnoreCase(side)) {
                    System.out.println("bottom");
                }
            }
        };
    }
}

上面的代码生成以下结果。