VBox布局将子节点堆叠在垂直列中。新添加的子节点被放置在上一个子节点的下面。默认情况下，VBox尊重子节点的首选宽度和高度。

当父节点不可调整大小时，例如Group节点，最大垂直列的宽度基于具有最大优选宽度的节点。
默认情况下，每个子节点与左上(Pos.TOP_LEFT)位置对齐。

示例

以下代码将TextArea控件设置为在调整父VBox的高度时垂直增长：

TextArea  myTextArea = new TextArea();
//设置后跟随外边框增长
VBox.setHgrow(myTextArea,  Priority.ALWAYS);

完整的代码如下所示

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        TextArea myTextArea = new TextArea();
        VBox hbox = new VBox();
        hbox.getChildren().add(myTextArea);
        //设置以后跟随外边框增长
        VBox.setVgrow(myTextArea, Priority.ALWAYS);
        
        Scene scene = new Scene(hbox, 320, 112, Color.rgb(0, 0, 0, 0));
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}

示例

下面的代码使用四个矩形来演示VBox的使用。

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        Group root = new Group();
        Scene scene = new Scene(root, 300, 250);
        // 5 pixels space between child nodes
        VBox vbox = new VBox(5);
        // 1 pixel padding between child nodes only
        vbox.setPadding(new Insets(1));
        Rectangle r1 = new Rectangle(10, 10);
        Rectangle r2 = new Rectangle(20, 100);
        Rectangle r3 = new Rectangle(50, 20);
        Rectangle r4 = new Rectangle(20, 50);
        
        VBox.setMargin(r1, new Insets(2, 2, 2, 2));
        
        vbox.getChildren().addAll(r1, r2, r3, r4);
        root.getChildren().add(vbox);
        
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}

VBox间距

VBox vbox = new VBox(8); // spacing = 8
vbox.getChildren().addAll(new Button("Cut"), new Button("Copy"), new Button("Paste"));

完整的实现代码如下所示

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {
    
    @Override
    public void start(final Stage stage) {
        stage.setTitle("HTML");
        stage.setWidth(500);
        stage.setHeight(500);
        Scene scene = new Scene(new Group());
        
        VBox vbox = new VBox(8); // spacing = 8
        vbox.getChildren().addAll(new Button("Cut"), new Button("Copy"), new Button("Paste"));
        
        scene.setRoot(vbox);
        
        stage.setScene(scene);
        stage.show();
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}

设置填充和间距

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
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("VBox Test");
        
        // VBox
        VBox vb = new VBox();
        vb.setPadding(new Insets(10, 50, 50, 50));
        vb.setSpacing(10);
        
        Label lbl = new Label("VBox");
        lbl.setFont(Font.font("Amble CN", FontWeight.BOLD, 24));
        vb.getChildren().add(lbl);
        
        // Buttons
        Button btn1 = new Button();
        btn1.setText("Button1");
        vb.getChildren().add(btn1);
        
        Button btn2 = new Button();
        btn2.setText("Button2");
        vb.getChildren().add(btn2);
        
        Button btn3 = new Button();
        btn3.setText("Button3");
        vb.getChildren().add(btn3);
        
        Button btn4 = new Button();
        btn4.setText("Button4");
        vb.getChildren().add(btn4);
        
        // Adding VBox to the scene
        Scene scene = new Scene(vb);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}