JavaFX detect when scrollbar movement is complete - javafx

Question

Swing provided java.awt.event.AdjustmentEvent.getValueIsAdjusting() which could be used to detect when a JScrollBar movement was completed. This was used in a legacy application so that it only requested data once rather than on every little scroll movement.
JFrame frame = new JFrame();
JScrollBar comp = new JScrollBar();
comp.addAdjustmentListener(e -> {
if (!e.getValueIsAdjusting()) {
System.out.println("Finished " + e.getValue());
}
});
frame.add(comp);
comp.setPreferredSize(new Dimension(25, 300));
frame.pack();
frame.setVisible(true);
I'm looking for an equivalent method in JavaFX with ScrollBar. It appears that ScrollBar only has a way of monitoring the current value. I've reviewed the code in com.sun.javafx.scene.control.behavior.ScrollBarBehavior but can see no obvious way to do this.
My workaround for now is fairly ugly. It uses a pair of event listeners to drag if the mouse is pressed, this state is used to maintain another valueProperty() which is only updated when the mouse is released.
Is there a better/easier way to do this?
#Override
public void start(Stage primaryStage) throws Exception {
ScrollBar scrollbar = new ScrollBar();
new ScrollBarFinishedAdjusting(scrollbar).valueProperty().addListener((obs, oldValue, newValue) -> {
System.out.println("Finished " + newValue);
});
primaryStage.setScene(new Scene(scrollbar));
primaryStage.show();
}
private class ScrollBarFinishedAdjusting {
private boolean mouseDown;
private DoubleProperty value = new SimpleDoubleProperty();
private ScrollBar scrollbar;
public ScrollBarFinishedAdjusting(ScrollBar scrollbar) {
this.scrollbar = scrollbar;
scrollbar.valueProperty().addListener((obs, oldValue, newValue) -> {
if (!mouseDown) {
update();
}
});
scrollbar.addEventFilter(MouseEvent.MOUSE_PRESSED, event -> {
mouseDown = true;
});
scrollbar.addEventFilter(MouseEvent.MOUSE_RELEASED, event -> {
mouseDown = false;
update();
});
update();
}
private void update() {
value.set(scrollbar.getValue());
}
public ReadOnlyDoubleProperty valueProperty() {
return value;
}
}