JavaFX: Handling scrollbar events

By adding change listner to scroll bar, you can catch the events of scroll bar.

Ex

scrollBar.valueProperty().addListener((ObservableValue<? extends Number> ov, Number old_val, Number new_val) -> {

         label.setText("Scrollbar value changed from " + old_val + " to " + new_val);

});

Find the below working application.

ScrollBarApp.java

package com.sample.demos;

import java.io.FileNotFoundException;
import java.net.MalformedURLException;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Orientation;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollBar;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class ScrollBarApp extends Application {

 @Override
 public void start(Stage primaryStage) throws FileNotFoundException, MalformedURLException {

  ScrollBar scrollBar = new ScrollBar();
  scrollBar.setMin(0);
  scrollBar.setOrientation(Orientation.VERTICAL);
  scrollBar.setPrefHeight(180);
  scrollBar.setMax(360);
  scrollBar.setUnitIncrement(30);
  scrollBar.setBlockIncrement(35);

  Label label = new Label();
  label.setTextFill(Color.RED);

  HBox hBox = new HBox(30, scrollBar, label);

  Group root = new Group();
  root.getChildren().addAll(hBox);

  Scene scene = new Scene(root, 500, 300);

  scrollBar.valueProperty().addListener((ObservableValue<? extends Number> ov, Number old_val, Number new_val) -> {
   label.setText("Scrollbar value changed from " + old_val + " to " + new_val);
  });

  /* Set the scene to primaryStage, and call the show method */
  primaryStage.setTitle("JavaFX scroll bar app Example");
  primaryStage.setScene(scene);
  primaryStage.show();
 }

}

TestFX.java

package com.sample.demos;

import javafx.application.Application;

public class TestFX {
 public static void main(String args[]) {
  Application.launch(ScrollBarApp.class, args);
 }
}

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