Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\scene\control\behavior\SpinnerBehavior.java

/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
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 *
 *
 *
 *
 *
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 */
package com.sun.javafx.scene.control.behavior;

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.control.Spinner;
import javafx.scene.control.SpinnerValueFactory;
import javafx.util.Duration;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import static javafx.scene.input.KeyCode.*;

public class SpinnerBehavior<T> extends BehaviorBase<Spinner<T>> {

// this specifies how long the mouse has to be pressed on a button
    // before the value steps. As the mouse is held down longer, we begin
    // to cut down the duration of subsequent steps (and also increase the
    // step size)
    private static final double INITIAL_DURATION_MS = 750;

private final int STEP_AMOUNT = 1;

private boolean isIncrementing = false;

private Timeline timeline;

final EventHandler<ActionEvent> spinningKeyFrameEventHandler = event -> {
        final SpinnerValueFactory<T> valueFactory = getControl().getValueFactory();
        if (valueFactory == null) {
            return;
        }

if (isIncrementing) {
            increment(STEP_AMOUNT);
        } else {
            decrement(STEP_AMOUNT);
        }
    };

/***************************************************************************
     *                                                                         *
     * Constructors                                                            *
     *                                                                         *
     **************************************************************************/

public SpinnerBehavior(Spinner<T> spinner) {
        super(spinner, SPINNER_BINDINGS);
    }

/***************************************************************************
     *                                                                         *
     * Key event handling                                                      *
     *                                                                         *
     **************************************************************************/

/**
     * Indicates that a keyboard key has been pressed which represents the
     * event (this could be space bar for example). As long as keyDown is true,
     * we are also armed, and will ignore mouse events related to arming.
     * Note this is made package private solely for the sake of testing.
     */
    private boolean keyDown;

protected static final List<KeyBinding> SPINNER_BINDINGS = new ArrayList<KeyBinding>();
    static {
        SPINNER_BINDINGS.add(new KeyBinding(UP, "increment-up"));
        SPINNER_BINDINGS.add(new KeyBinding(RIGHT, "increment-right"));
        SPINNER_BINDINGS.add(new KeyBinding(LEFT, "decrement-left"));
        SPINNER_BINDINGS.add(new KeyBinding(DOWN, "decrement-down"));
    }

@Override protected void callAction(String name) {
        boolean vertical = arrowsAreVertical();

switch (name) {
            case "increment-up": {
                if (vertical) increment(1); else traverseUp(); break;
            }
            case "increment-right": {
                if (! vertical) increment(1); else traverseRight(); break;
            }
            case "decrement-down": {
                if (vertical) decrement(1); else traverseDown(); break;
            }
            case "decrement-left": {
                if (! vertical) decrement(1); else traverseLeft(); break;
            }
            default: super.callAction(name); break;
        }
    }

/***************************************************************************
     *                                                                         *
     * API                                                                     *
     *                                                                         *
     **************************************************************************/

public void increment(int steps) {
        getControl().increment(steps);
    }

public void decrement(int steps) {
        getControl().decrement(steps);
    }

public void startSpinning(boolean increment) {
        isIncrementing = increment;

if (timeline != null) {
            timeline.stop();
        }
        timeline = new Timeline();
        timeline.setCycleCount(Timeline.INDEFINITE);
        final KeyFrame kf = new KeyFrame(Duration.millis(INITIAL_DURATION_MS), spinningKeyFrameEventHandler);
        timeline.getKeyFrames().setAll(kf);
        timeline.playFromStart();
        timeline.play();
        spinningKeyFrameEventHandler.handle(null);
    }

public void stopSpinning() {
        if (timeline != null) {
            timeline.stop();
        }
    }

/***************************************************************************
     *                                                                         *
     * Implementation                                                          *
     *                                                                         *
     **************************************************************************/

private boolean arrowsAreVertical() {
        final List<String> styleClass = getControl().getStyleClass();

return ! (styleClass.contains(Spinner.STYLE_CLASS_ARROWS_ON_LEFT_HORIZONTAL)  ||
                  styleClass.contains(Spinner.STYLE_CLASS_ARROWS_ON_RIGHT_HORIZONTAL) ||
                  styleClass.contains(Spinner.STYLE_CLASS_SPLIT_ARROWS_HORIZONTAL));
    }
}

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