JavaFX: Handling ScrollPane events

By adding change listener to ScrollPane, you can handle the events on scroll pane.

Ex

scrollPane1.vvalueProperty().addListener((ObservableValue<? extends Number> ov, Number old_val, Number new_val) -> {

         label.setText("Scroll pane 1 changed from " + old_val + " to " + new_val);

});

Find the below working example.

ScrollPaneApp.java

package com.sample.demos;

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

import javafx.application.Application;
import javafx.beans.value.ObservableValue;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.ScrollPane.ScrollBarPolicy;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class ScrollPaneApp extends Application {

 private static final String imageFilePath = "C:\\Users\\krishna\\Documents\\Study\\javaFX\\flowers.jpg";

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

  ScrollPane scrollPane1 = new ScrollPane();
  scrollPane1.setHbarPolicy(ScrollBarPolicy.ALWAYS);
  scrollPane1.setVbarPolicy(ScrollBarPolicy.ALWAYS);

  ScrollPane scrollPane2 = new ScrollPane();
  scrollPane2.setHbarPolicy(ScrollBarPolicy.ALWAYS);
  scrollPane2.setVbarPolicy(ScrollBarPolicy.ALWAYS);

  InputStream is = new FileInputStream(imageFilePath);
  Image image = new Image(is);

  scrollPane1.setContent(new ImageView(image));
  scrollPane2.setContent(new ImageView(image));
  
  Label label = new Label();
  label.setTextFill(Color.RED);
  label.setWrapText(true);
  label.maxWidth(100);

  HBox hBox = new HBox(30, scrollPane1, scrollPane2, label);

  Scene scene = new Scene(hBox, 800, 200);

  scrollPane1.vvalueProperty().addListener((ObservableValue<? extends Number> ov, Number old_val, Number new_val) -> {
   label.setText("Scroll pane 1 changed from " + old_val + " to " + new_val);
  });
  
  scrollPane2.vvalueProperty().addListener((ObservableValue<? extends Number> ov, Number old_val, Number new_val) -> {
   label.setText("Scroll pane 2 changed from " + old_val + " to " + new_val);
  });

  /* Set the scene to primaryStage, and call the show method */
  primaryStage.setTitle("JavaFX scroll pane 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(ScrollPaneApp.class, args);
 }
}

Previous                                                 Next                                                 Home