AnchorPane

锚点窗格允许子节点的边缘锚定到锚点窗格边缘的偏移量。 如果锚窗格具有边框和/或填充集，则将从这些插图的内边缘测量偏移。

如果我们在应用程序中使用Anchor窗格，则其中的节点将锚定在距窗格特定距离处。

包javafx.scene.layout名为AnchorPane的类表示Anchor窗格。 添加节点后，您需要从窗格的所有方向（顶部，底部，右侧和左侧）设置锚点。 要设置锚点，此类提供四种方法，即 - setBottomAnchor(), setTopAnchor(), setLeftAnchor(), setRightAnchor() 。 对于这些方法，您需要传递表示锚点的double值。

例子 (Example)

以下程序是Anchor Pane布局的示例。 在此，我们在锚窗格中插入旋转圆柱体。 与此同时，我们将它设置在距离所有方向（顶部，左侧，右侧，底部）的窗格50个单元的位置。

将此代码保存在名为AnchorPaneExample.java的文件中。

import javafx.animation.RotateTransition; 
import javafx.collections.ObservableList; 
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane; 
import javafx.scene.paint.Color; 
import javafx.scene.paint.PhongMaterial; 
import javafx.scene.shape.Cylinder; 
import javafx.scene.transform.Rotate; 
import javafx.stage.Stage; 
import javafx.util.Duration;          
public class AnchorPaneExample extends Application { 
   @Override 
   public void start(Stage stage) {                     
      //Drawing a Cylinder 
      Cylinder cylinder = new Cylinder();        
      //Setting the properties of the Cylinder 
      cylinder.setHeight(180.0f); 
      cylinder.setRadius(100.0f);     
      //Preparing the phong material of type diffuse color 
      PhongMaterial material = new PhongMaterial();  
      material.setDiffuseColor(Color.BLANCHEDALMOND); 
      //Setting the diffuse color material to Cylinder5 
      cylinder.setMaterial(material);  
      //Setting rotation transition for the cylinder 
      RotateTransition rotateTransition = new RotateTransition(); 
      //Setting the duration for the transition 
      rotateTransition.setDuration(Duration.millis(1000)); 
      //Setting the node for the transition 
      rotateTransition.setNode(cylinder);       
      //Setting the axis of the rotation 
      rotateTransition.setAxis(Rotate.X_AXIS);  
      //Setting the angle of the rotation 
      rotateTransition.setByAngle(360);
      //Setting the cycle count for the transition 
      rotateTransition.setCycleCount(RotateTransition.INDEFINITE); 
      //Setting auto reverse value to false 
      rotateTransition.setAutoReverse(false); 
      //playing the animation 
      rotateTransition.play(); 
      //Creating an Anchor Pane  
      AnchorPane anchorPane = new AnchorPane();  
      //Setting the anchor to the cylinder      
      AnchorPane.setTopAnchor(cylinder, 50.0); 
      AnchorPane.setLeftAnchor(cylinder, 50.0); 
      AnchorPane.setRightAnchor(cylinder, 50.0); 
      AnchorPane.setBottomAnchor(cylinder, 50.0); 
      //Retrieving the observable list of the Anchor Pane 
      ObservableList list = anchorPane.getChildren();  
      //Adding cylinder to the pane 
      list.addAll(cylinder);        
      //Creating a scene object 
      Scene scene = new Scene(anchorPane);  
      //Setting title to the Stage 
      stage.setTitle("Anchor Pane Example"); 
      //Adding scene to the stage 
      stage.setScene(scene); 
      //Displaying the contents of the stage 
      stage.show(); 
   } 
   public static void main(String args[]){ 
      launch(args); 
   } 
}

使用以下命令从命令提示符编译并执行保存的java文件。

javac AnchorPaneExample.java 
java AnchorPaneExample

执行时，上面的程序生成一个JavaFX窗口，如下所示。