Slider value property change listener : Slider « JavaFX « Java

1. Java
2. JavaFX
3. Slider

Slider value property change listener

 

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class Main extends Application {

    final Slider opacityLevel = new Slider(0, 1, 1);    
    final Label opacityCaption = new Label("Opacity Level:");
    final Label opacityValue = new Label(Double.toString(opacityLevel.getValue()));

    @Override
    public void start(Stage stage) {
        Group root = new Group();
        Scene scene = new Scene(root, 600, 400);
        stage.setScene(scene);
        stage.setTitle("Slider Sample");
    

        GridPane grid = new GridPane();
        grid.setPadding(new Insets(10, 10, 10, 10));
        grid.setVgap(10);
        grid.setHgap(70);

        scene.setRoot(grid);

        GridPane.setConstraints(opacityCaption, 0, 1);
        grid.getChildren().add(opacityCaption);
        

        opacityLevel.valueProperty().addListener(new ChangeListener<Number>() {
            public void changed(ObservableValue<? extends Number> ov,
                Number old_val, Number new_val) {
                    System.out.println(new_val.doubleValue());
                    opacityValue.setText(String.format("%.2f", new_val));
            }
        });

        GridPane.setConstraints(opacityLevel, 1, 1);
        grid.getChildren().add(opacityLevel);


        GridPane.setConstraints(opacityValue, 2, 1);
        grid.getChildren().add(opacityValue);

        stage.show();
    }
    public static void main(String[] args) {
        launch(args);
    }
}

   
  

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