JavaFX 19. Bidirectional Binding and using Slider

1. Main.java

package application;
    
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
 
 
public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("/application/Main.fxml"));
            Scene scene = new Scene(root);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}
 

2. Main.fxml

<?xml version="1.0" encoding="UTF-8"?>
 
<?import javafx.scene.control.Slider?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
 
 
<AnchorPane prefHeight="500.0" prefWidth="500.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.60" fx:controller="application.MainController">
   <children>
      <Slider fx:id="slider" layoutX="27.0" layoutY="31.0" prefHeight="55.0" prefWidth="436.0" />
      <TextField fx:id="field" layoutX="27.0" layoutY="101.0" prefHeight="29.0" prefWidth="436.0" />
   </children>
</AnchorPane>
 

3. MainController.java

package application;
 
import java.net.URL;
import java.text.NumberFormat;
import java.util.ResourceBundle;
 
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Slider;
import javafx.scene.control.TextField;
 
public class MainController implements Initializable {
 
    @FXML
    private Slider slider;
    
    @FXML
    private TextField field;
    
    private static final double INIT_VALUE = 50;
    @Override
    public void initialize(URL location, ResourceBundle resources) {
        slider.setValue(INIT_VALUE);
        field.setText(new Double(INIT_VALUE).toString());
        field.textProperty().bindBidirectional(slider.valueProperty(), NumberFormat.getNumberInstance());
    }
 
}
 

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