java JavaFX | VBox 类

JavaFX | VBox 类

原文:https://www.geeksforgeeks.org/javafx-vbox-class/

VBox 是 JavaFX 的一部分。VBox 以垂直列的形式布局其子代。如果 vbox 设置了边框和/或填充，那么内容将在这些插页中显示。VBox 类扩展了窗格类。

该类的构造函数:

VBox() :创建间距= 0 且在 TOP_LEFT 对齐的 VBox 布局。
VBox(双 s) :创建一个新的 VBox，在子对象之间有指定的间距。
VBox(double s，Node… c) :用指定的节点和节点之间的间距创建一个新的 VBox。
VBox(Node… c) :创建间距= 0 的 VBox 布局。

常用方法:

方法	说明
getAlignment()	返回属性对齐的值。
getSpacing()	返回其子对象之间的间距。
设置对齐(位置值)	设置 VBox 的对齐方式。
getChildren()	返回 VBox 中的节点。

下面的程序说明了 VBox 类的使用:

Java Program to create a VBox and add it to the stage: In this program we will create a VBox named vbox. We will create a label and add it to the vbox. We will also create some buttons and add them to the VBox using the getChildren().add() function. Now create a scene and add the vbox to the scene and add the scene to the stage and call show() function to display the final results.

```java // Java Program to create a VBox // and add it to the stage import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.; import javafx.scene.layout.; import javafx.stage.Stage; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.canvas.; import javafx.scene.web.; import javafx.scene.Group;

public class VBOX_1 extends Application {

// launch the application     public void start(Stage stage)     {

try {

// set title for the stage             stage.setTitle("VBox");

// create a VBox             VBox vbox = new VBox();

// create a label             Label label = new Label("this is VBox example");

// add label to vbox             vbox.getChildren().add(label);

// add buttons to VBox             for (int i = 0; i < 10; i++)             {                 vbox.getChildren().add(new Button("Button " + (int)(i + 1)));             }

// create a scene             Scene scene = new Scene(vbox, 300, 300);

// set the scene             stage.setScene(scene);

stage.show();         }

catch (Exception e) {

System.out.println(e.getMessage());         }     }

// Main Method     public static void main(String args[])     {

// launch the application         launch(args);     } } ```

输出:
Java Program to create a VBox, add spaces between its elements and add it to the stage: In this program we will create a VBox named vbox. We will set the spacing by passing a double value of space as an argument to the constructor. Now create a label and add it to the vbox. To add some buttons to the VBox use the getChildren().add() function. Finally, create a scene and add the vbox to the scene and add the scene to the stage and call show() function to display the final results.

```java // Java Program to create a VBox, add // spaces between its elements and add // it to the stage import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.; import javafx.scene.layout.; import javafx.stage.Stage; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.canvas.; import javafx.scene.web.; import javafx.scene.Group;

public class VBOX_2 extends Application {

// launch the application     public void start(Stage stage)     {

try {

// set title for the stage             stage.setTitle("VBox");

// create a VBox             VBox vbox = new VBox(10);

// create a label             Label label = new Label("this is VBox example");

// add label to vbox             vbox.getChildren().add(label);

// add buttons to VBox             for (int i = 0; i < 5; i++)             {                 vbox.getChildren().add(new Button("Button " + (int)(i + 1)));             }

// create a scene             Scene scene = new Scene(vbox, 300, 300);

// set the scene             stage.setScene(scene);

stage.show();         }

catch (Exception e) {

System.out.println(e.getMessage());         }     }

// Main Method     public static void main(String args[])     {

// launch the application         launch(args);     } } ```

输出:
Java Program to create a VBox, add spaces between its elements, set an alignment and add it to the stage: In this program we will create a VBox named vbox. We will set the spacing by passing a double value of space as an argument to the constructor. Set the alignment of the VBox using the setAlignment() function. Then create a label and add it to the vbox. Add some buttons to the VBox using the getChildren().add() function. Finally, create a scene and add the vbox to the scene and add the scene to the stage and call show() function to display the final results.

```java // Java Program to create a VBox, add spaces // between its elements, set an alignment // and add it to the stage import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.; import javafx.scene.layout.; import javafx.stage.Stage; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.Group; import javafx.geometry.Pos;

public class VBOX_3 extends Application {

// launch the application     public void start(Stage stage)     {

try {

// set title for the stage             stage.setTitle("VBox");

// create a VBox             VBox vbox = new VBox(10);

// create a label             Label label = new Label("this is VBox example");

// add label to vbox             vbox.getChildren().add(label);

// set alignment             vbox.setAlignment(Pos.CENTER);

// add buttons to VBox             for (int i = 0; i < 5; i++)             {                 vbox.getChildren().add(new Button("Button " + (int)(i + 1)));             }

// create a scene             Scene scene = new Scene(vbox, 300, 300);

// set the scene             stage.setScene(scene);

stage.show();         }

catch (Exception e) {

System.out.println(e.getMessage());         }     }

// Main Method     public static void main(String args[])     {

// launch the application         launch(args);     } } ```

输出: