JavaFX | AnchorPane Class

AnchorPane class is a part of JavaFX. AnchorPane allows the edges of child nodes to be anchored to an offset from the anchor pane’s edges. If the anchor pane has a border and/or padding set, the offsets will be measured from the inside edge of those insets. AnchorPane inherits Pane class.

Constructors of the class:

1. AnchorPane(): Creates a new AnchorPane.
2. AnchorPane(Node… c): Creates a AnchorPane with specified nodes.

Commonly Used Methods:

Method	Explanation
getBottomAnchor(Node c)	Returns the child’s bottom anchor.
getLeftAnchor(Node c)	Returns the child’s left anchor.
getRightAnchor(Node c)	Returns the child’s right anchor.
getTopAnchor(Node c)	Returns the child’s top anchor.
setBottomAnchor(Node c, Double v)	Sets the child’s bottom anchor.
setLeftAnchor(Node c, Double v)	Sets the child’s left anchor.
setRightAnchor(Node c, Double v)	Sets the child’s right anchor.
setTopAnchor(Node c, Double v)	Sets the child’s top anchor.

Below programs illustrate the use of the AnchorPane Class:

1. Java Program to create a AnchorPane and add label to it and add label to the stage: In this program we will create a AnchorPane named anchor_pane. Add a Label named label to the anchor_pane and set the top, bottom, left, right using the setTopAnchor(), setBottomAnchor(), setLeftAnchor(), setRightAnchor() functions respectively. Now add the anchor_pane to the Scene. Then finally add the scene to the stage and call the show() function to display the results.

   // Java Program to create a AnchorPane and
   // add label to it and add label 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.layout.AnchorPane;
   import javafx.scene.shape.*;
   
   public class AnchorPane_1 extends Application {
   
       // launch the application
       public void start(Stage stage)
       {
   
           try {
   
               // set title for the stage
               stage.setTitle("AnchorPane");
   
               // create a label
               Label label = new Label("this is AnchorPane example");
   
               // create a AnchorPane
               AnchorPane anchor_pane = new AnchorPane(label);
   
               // anchor to the label
               AnchorPane.setTopAnchor(label, 10.0);
               AnchorPane.setLeftAnchor(label, 10.0);
               AnchorPane.setRightAnchor(label, 10.0);
               AnchorPane.setBottomAnchor(label, 10.0);
   
               // create a scene
               Scene scene = new Scene(anchor_pane, 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);
       }
   }

   Output:

   

2. Java Program to create a AnchorPane, adding label and button to it and also setting the min height and width of AnchorPane then add it to the stage: In this program we will create a AnchorPane named anchor_pane. Add a Label named label to the anchor_pane. Also add a Button named button and set the top, bottom, left, right anchor using the setTopAnchor(), setBottomAnchor(), setLeftAnchor(), setRightAnchor() functions respectively. Set the min height and width using the setMinHeight() and setMinWidth() function. Add the anchor_pane to the Scene. Finally, add the scene to the stage and call the show() function to display the results.

   // Java Program to create a AnchorPane, adding
   // label and button to it and also setting the
   // min height and width of AnchorPane then 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.layout.AnchorPane;
   import javafx.scene.shape.*;
   
   public class AnchorPane_2 extends Application {
   
       // launch the application
       public void start(Stage stage)
       {
   
           try {
   
               // set title for the stage
               stage.setTitle("AnchorPane");
   
               // create a label
               Label label = new Label("this is AnchorPane example");
   
               // create a AnchorPane
               AnchorPane anchor_pane = new AnchorPane(label);
   
               // anchor to the label
               AnchorPane.setTopAnchor(label, 120.0);
               AnchorPane.setLeftAnchor(label, 10.0);
               AnchorPane.setRightAnchor(label, 230.0);
               AnchorPane.setBottomAnchor(label, 120.0);
   
               Button button = new Button("button ");
   
               // anchor to the button
               AnchorPane.setTopAnchor(button, 125.0);
               AnchorPane.setLeftAnchor(button, 220.0);
               AnchorPane.setRightAnchor(button, 110.0);
               AnchorPane.setBottomAnchor(button, 125.0);
   
               anchor_pane.getChildren().add(button);
   
               anchor_pane.setMinHeight(400);
               anchor_pane.setMinWidth(400);
   
               // create a scene
               Scene scene = new Scene(anchor_pane, 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);
       }
   }

   Output:

   

Note: The above programs might not run in an online IDE please use an offline compiler.

Reference: https://docs.oracle.com/javase/8/javafx/api/javafx/scene/layout/AnchorPane.html