ScrollBar visibleAmountProperty JavaFX 2.1.1 and 2.2.0-beta

Hi,
I'm new to JavaFX. I tried the JavaFX examples provided by Oracle. In the Ensemble.jar there is an example called "Display Shelf" where several images are loaded and at the bottom you can see a scrollbar.
I have a question to the setVisibleAmount method of a ScrollBar. If I understood properly, the visibleAmountProperty specifies the size of the scroll bar's thumb. When I start the "Display Shelf" example with only 2 images (see the code below), the thumb of the scrollbar fills the complete scrollbar. My expectation was that the thumb only fills half of the available space. That is the reason why I played with the visibleAmountProperty and found out that scrollBar.setVisibleAmount(0.5) works fine for 2 images. But I don't understand why and how this property works. My understanding was:
If I load 2 images and setVisibleAmount is set to 1, the size of the thumb should be 1/2 of the scrollbar's size;
if I load 14 images and setVisibleAmount is set to 1, the size of the thumb should be 1/14 of the scrollbar's size.
If I set the visibleAmountProperty to 0, I understand that the thumb's size is not adjusted. But I don't want to use 0 because it is too small for my application. The thumb's size should be adjusted depending on the number of loaded images.
Can you explain me how setVisibleAmount works and to which value it should be set? (Is there a bug?)
Here is the slightly modified "Display Shelf" example:
* Copyright (c) 2008, 2012 Oracle and/or its affiliates.
* All rights reserved. Use is subject to license terms.
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.animation.Interpolator;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Parent;
import javafx.scene.control.ScrollBar;
import javafx.scene.effect.PerspectiveTransform;
import javafx.scene.effect.ReflectionBuilder;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Region;
import javafx.scene.shape.Rectangle;
import javafx.util.Duration;
* A display shelf of images using the PerspectiveTransform effect.
* @see javafx.scene.effect.PerspectiveTransform
* @see javafx.scene.effect.Reflection
* @see javafx.scene.control.ScrollBar
* @see javafx.scene.input.MouseEvent
* @see javafx.scene.input.KeyEvent
* @resource animal1.jpg
* @resource animal2.jpg
* @resource animal3.jpg
* @resource animal4.jpg
* @resource animal5.jpg
* @resource animal6.jpg
* @resource animal7.jpg
* @resource animal8.jpg
* @resource animal9.jpg
* @resource animal10.jpg
* @resource animal11.jpg
* @resource animal12.jpg
* @resource animal13.jpg
* @resource animal14.jpg
public class DisplayShelfSample extends Application {
    private static final double WIDTH = 450, HEIGHT = 300;
    private void init(Stage primaryStage) {
        Group root = new Group();
        primaryStage.setResizable(false);
        primaryStage.setScene(new Scene(root, 495,300));
        // load images
//        Image[] images = new Image[14];
//        for (int i = 0; i < 14; i++) {
//            images[i] = new Image( DisplayShelfSample.class.getResource("animal"+(i+1)+".jpg").toExternalForm(),false);
/*start of my modification: load only 2 images instead of 14*/
        Class<DisplayShelfSample> clazz = DisplayShelfSample.class;
        ClassLoader cl = clazz.getClassLoader();
        Image[] images = new Image[2];
        for (int i = 0; i < 2; i++) {
            images[i] = new Image(cl.getResource("smallimage"+(i+1)+".jpg").toExternalForm(),false);
/*end of my modification*/
        // create display shelf
        DisplayShelf displayShelf = new DisplayShelf(images);
        displayShelf.setPrefSize(WIDTH, HEIGHT);
        root.getChildren().add(displayShelf);
     * A ui control which displays a browsable display shelf of images
    public static class DisplayShelf extends Region {
        private static final Duration DURATION = Duration.millis(500);
        private static final Interpolator INTERPOLATOR = Interpolator.EASE_BOTH;
        private static final double SPACING = 50;
        private static final double LEFT_OFFSET = -110;
        private static final double RIGHT_OFFSET = 110;
        private static final double SCALE_SMALL = 0.7;
        private PerspectiveImage[] items;
        private Group centered = new Group();
        private Group left = new Group();
        private Group center = new Group();
        private Group right = new Group();
        private int centerIndex = 0;
        private Timeline timeline;
        private ScrollBar scrollBar = new ScrollBar();
        private boolean localChange = false;
        private Rectangle clip = new Rectangle();
        public DisplayShelf(Image[] images) {
            // set clip
            setClip(clip);
            // set background gradient using css
            setStyle("-fx-background-color: linear-gradient(to bottom," +
                    " black 60, #141414 60.1%, black 100%);");
            // style scroll bar color
            scrollBar.setStyle("-fx-base: #202020; -fx-background: #202020;");
            // create items
            items = new PerspectiveImage[images.length];
            for (int i=0; i<images.length; i++) {
                final PerspectiveImage item =
                        items[i] = new PerspectiveImage(images);
final double index = i;
item.setOnMouseClicked(new EventHandler<MouseEvent>() {
public void handle(MouseEvent me) {
localChange = true;
scrollBar.setValue(index);
localChange = false;
shiftToCenter(item);
// setup scroll bar
scrollBar.setMax(items.length-1);
scrollBar.setVisibleAmount(0.5);
scrollBar.setUnitIncrement(1);
scrollBar.setBlockIncrement(1);
scrollBar.valueProperty().addListener(new InvalidationListener() {
public void invalidated(Observable ov) {
if(!localChange)
shiftToCenter(items[(int)scrollBar.getValue()]);
// create content
centered.getChildren().addAll(left, right, center);
getChildren().addAll(centered,scrollBar);
// listen for keyboard events
setFocusTraversable(true);
setOnKeyPressed(new EventHandler<KeyEvent>() {
public void handle(KeyEvent ke) {
if (ke.getCode() == KeyCode.LEFT) {
shift(1);
localChange = true;
scrollBar.setValue(centerIndex);
localChange = false;
} else if (ke.getCode() == KeyCode.RIGHT) {
shift(-1);
localChange = true;
scrollBar.setValue(centerIndex);
localChange = false;
// update
update();
@Override protected void layoutChildren() {
// update clip to our size
clip.setWidth(getWidth());
clip.setHeight(getHeight());
// keep centered centered
centered.setLayoutY((getHeight() - PerspectiveImage.HEIGHT) / 2);
centered.setLayoutX((getWidth() - PerspectiveImage.WIDTH) / 2);
// position scroll bar at bottom
scrollBar.setLayoutX(10);
scrollBar.setLayoutY(getHeight()-25);
scrollBar.resize(getWidth()-20,15);
private void update() {
// move items to new homes in groups
left.getChildren().clear();
center.getChildren().clear();
right.getChildren().clear();
for (int i = 0; i < centerIndex; i++) {
left.getChildren().add(items[i]);
center.getChildren().add(items[centerIndex]);
for (int i = items.length - 1; i > centerIndex; i--) {
right.getChildren().add(items[i]);
// stop old timeline if there is one running
if (timeline!=null) timeline.stop();
// create timeline to animate to new positions
timeline = new Timeline();
// add keyframes for left items
final ObservableList<KeyFrame> keyFrames = timeline.getKeyFrames();
for (int i = 0; i < left.getChildren().size(); i++) {
final PerspectiveImage it = items[i];
double newX = -left.getChildren().size() *
SPACING + SPACING * i + LEFT_OFFSET;
keyFrames.add(new KeyFrame(DURATION,
new KeyValue(it.translateXProperty(), newX, INTERPOLATOR),
new KeyValue(it.scaleXProperty(), SCALE_SMALL, INTERPOLATOR),
new KeyValue(it.scaleYProperty(), SCALE_SMALL, INTERPOLATOR),
new KeyValue(it.angle, 45.0, INTERPOLATOR)));
// add keyframe for center item
final PerspectiveImage centerItem = items[centerIndex];
keyFrames.add(new KeyFrame(DURATION,
new KeyValue(centerItem.translateXProperty(), 0, INTERPOLATOR),
new KeyValue(centerItem.scaleXProperty(), 1.0, INTERPOLATOR),
new KeyValue(centerItem.scaleYProperty(), 1.0, INTERPOLATOR),
new KeyValue(centerItem.angle, 90.0, INTERPOLATOR)));
// add keyframes for right items
for (int i = 0; i < right.getChildren().size(); i++) {
final PerspectiveImage it = items[items.length - i - 1];
final double newX = right.getChildren().size() *
SPACING - SPACING * i + RIGHT_OFFSET;
keyFrames.add(new KeyFrame(DURATION,
new KeyValue(it.translateXProperty(), newX, INTERPOLATOR),
new KeyValue(it.scaleXProperty(), SCALE_SMALL, INTERPOLATOR),
new KeyValue(it.scaleYProperty(), SCALE_SMALL, INTERPOLATOR),
new KeyValue(it.angle, 135.0, INTERPOLATOR)));
// play animation
timeline.play();
private void shiftToCenter(PerspectiveImage item) {
for (int i = 0; i < left.getChildren().size(); i++) {
if (left.getChildren().get(i) == item) {
int shiftAmount = left.getChildren().size() - i;
shift(shiftAmount);
return;
if (center.getChildren().get(0) == item) {
return;
for (int i = 0; i < right.getChildren().size(); i++) {
if (right.getChildren().get(i) == item) {
int shiftAmount = -(right.getChildren().size() - i);
shift(shiftAmount);
return;
public void shift(int shiftAmount) {
if (centerIndex <= 0 && shiftAmount > 0) return;
if (centerIndex >= items.length - 1 && shiftAmount < 0) return;
centerIndex -= shiftAmount;
update();
* A Node that displays a image with some 2.5D perspective rotation around the Y axis.
public static class PerspectiveImage extends Parent {
private static final double REFLECTION_SIZE = 0.25;
private static final double WIDTH = 200;
private static final double HEIGHT = WIDTH + (WIDTH*REFLECTION_SIZE);
private static final double RADIUS_H = WIDTH / 2;
private static final double BACK = WIDTH / 10;
private PerspectiveTransform transform = new PerspectiveTransform();
/** Angle Property */
private final DoubleProperty angle = new SimpleDoubleProperty(45) {
@Override protected void invalidated() {
// when angle changes calculate new transform
double lx = (RADIUS_H - Math.sin(Math.toRadians(angle.get())) * RADIUS_H - 1);
double rx = (RADIUS_H + Math.sin(Math.toRadians(angle.get())) * RADIUS_H + 1);
double uly = (-Math.cos(Math.toRadians(angle.get())) * BACK);
double ury = -uly;
transform.setUlx(lx);
transform.setUly(uly);
transform.setUrx(rx);
transform.setUry(ury);
transform.setLrx(rx);
transform.setLry(HEIGHT + uly);
transform.setLlx(lx);
transform.setLly(HEIGHT + ury);
public final double getAngle() { return angle.getValue(); }
public final void setAngle(double value) { angle.setValue(value); }
public final DoubleProperty angleModel() { return angle; }
public PerspectiveImage(Image image) {
ImageView imageView = new ImageView(image);
imageView.setEffect(ReflectionBuilder.create().fraction(REFLECTION_SIZE).build());
setEffect(transform);
getChildren().addAll(imageView);
public double getSampleWidth() { return 495; }
public double getSampleHeight() { return 300; }
@Override public void start(Stage primaryStage) throws Exception {
init(primaryStage);
primaryStage.show();
public static void main(String[] args) { launch(args); }

Hi Kaylee,
From my point of view, the Official Oracle example have 2 bugs. First of all use truncate: http://mindprod.com/jgloss/round.html#TRUNCATE to get the value and then the behaviour its not correct. This is the code of the example: shiftToCenter(items[(int)scrollBar.getValue()]); And the results would be (with just 3 images):
Scrollbar range: 0 - 2
Images values: 0, 1, 2
Scrollbar value: 0.0 shiftToCenterValue:0
Scrollbar value: 0.4 shiftToCenterValue:0
Scrollbar value: 0.5 shiftToCenterValue:0
Scrollbar value: 0.9 shiftToCenterValue:0
Scrollbar value: 1.0 shiftToCenterValue:1
Scrollbar value: 1.4 shiftToCenterValue:1
Scrollbar value: 1.5 shiftToCenterValue:1
Scrollbar value: 1.9 shiftToCenterValue:1
Scrollbar value: 2.0 shiftToCenterValue:2
So the ranges are:
Image 0: 0,0 - 0,999
Image 1: 1,0-1,999
Image 2: 2,0
If we rounded the value: shiftToCenter(items[(int)(scrollBar.getValue()+0.5)]); (there are different ways to round a value, this is the fastest one)
Scrollbar value: 0.0 shiftToCenterValue:0
Scrollbar value: 0.4 shiftToCenterValue:0
Scrollbar value: 0.5 shiftToCenterValue:1
Scrollbar value: 0.9 shiftToCenterValue:1
Scrollbar value: 1.0 shiftToCenterValue:1
Scrollbar value: 1.4 shiftToCenterValue:1
Scrollbar value: 1.5 shiftToCenterValue:2
Scrollbar value: 1.9 shiftToCenterValue:2
Scrollbar value: 2.0 shiftToCenterValue:2
So the ranges are:
Image 0: 0,0 - 0,4999
Image 1: 0,5-1,4999
Image 2: 1,5-2,0
Much better. But there is also another error, and this if the one that will let you show just 2 images. Change the code: scrollBar.setVisibleAmount(0.5); to scrollBar.setVisibleAmount(1); and then it doesn't deppend on the number of images it always let you navigate through the images. With 10 iamges works, and with 2 images too.
Maybe the JavaFx team could change these two errors on their example.
Have a nice week.
Edited by: ciruman on 06.08.2012 00:41
Edited by: ciruman on 06.08.2012 00:47

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