java JavaFX |组类

JavaFX |组类

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

Group 类是 JavaFX 的一部分。组包含节点的数量。组将采用其子代的集体边界，并且不能直接调整大小。组类继承父类。

该类的构造函数:

组():构建一个新的组。
组(集合子代) :构造一个具有指定节点的新组。
组(节点… c) :用指定的节点构建一个新的组。

常用方法:

方法	说明
getChildren()	返回组的子代。
isAutoSizeChildren()	获取属性 autoSizeChildren 的值。
明八(双宽)	返回用于布局计算的节点最小高度。
最小宽度(双倍高度)	返回用于布局计算的节点最小宽度。
预高(双倍宽)	组将首选高度简单地定义为其布局边界的高度。
预宽度(双倍高度)	组将首选宽度简单地定义为其布局边界的宽度。
setautosizeren(boolean v)	设置属性 autoSizeChildren 的值。

以下程序说明了组类的使用:

Java Program to create a Group and add it to the stage: In this program we are creating a Label named label, and a Circle named circle. Now create a Group name group and add the label and circle to it by using the getChildren().add() function. Create a scene and add the group to the scene. Add the scene to the stage and display the stage to view the final results.

```java // Java Program to create a Group // 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; import javafx.scene.shape.*;

public class Group_1 extends Application {

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

try {

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

// create a Group             Group group = new Group();

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

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

// circle             Circle c = new Circle(100, 100, 30);

// add Circle to Group             group.getChildren().add(c);

// create a scene             Scene scene = new Scene(group, 400, 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 Group, set auto resize to true and add it to the stage: In this program we are creating a Label named label and a Circle named circle. Then we will create a Group name group and add the label and circle to it by using the getChildren().add() function. Set the auto size children to true using the setAutoSize() function. Create a scene and add the group to the scene. Add the scene to the stage and display the stage to view the final results.

```java // Java Program to create a Group, // set auto resize to true // 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; import javafx.scene.shape.*;

public class Group_2 extends Application {

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

try {

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

// create a Group             Group group = new Group();

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

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

// circle             Circle c = new Circle(50, 50, 30);

// set auto resize             group.setAutoSizeChildren(true);

// add Circle to Group             group.getChildren().add(c);

// create a scene             Scene scene = new Scene(group, 400, 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: