ZoomExample.java Source code

Introduction

Here is the source code for ZoomExample.java

Source

import javafx.application.Application;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.ScrollEvent;
import javafx.stage.Stage;

/**
 * 
 * @author O.J. Sousa Rodrigues (office at halbgasse.at)
 */
public class ZoomExample extends Application {

    private ImageView imageView = new ImageView();
    private ScrollPane scrollPane = new ScrollPane();
    final DoubleProperty zoomProperty = new SimpleDoubleProperty(200);

    @Override
    public void start(Stage stage) throws Exception {

        zoomProperty.addListener(new InvalidationListener() {
            @Override
            public void invalidated(Observable arg0) {
                imageView.setFitWidth(zoomProperty.get() * 4);
                imageView.setFitHeight(zoomProperty.get() * 3);
            }
        });

        scrollPane.addEventFilter(ScrollEvent.ANY, new EventHandler<ScrollEvent>() {
            @Override
            public void handle(ScrollEvent event) {
                if (event.getDeltaY() > 0) {
                    zoomProperty.set(zoomProperty.get() * 1.1);
                } else if (event.getDeltaY() < 0) {
                    zoomProperty.set(zoomProperty.get() / 1.1);
                }
            }
        });

        imageView.setImage(new Image("http://yourImageURL"));
        imageView.preserveRatioProperty().set(true);
        scrollPane.setContent(imageView);

        stage.setScene(new Scene(scrollPane, 400, 300));
        stage.show();

    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        launch(args);
    }
}