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The JGoodies Looks make your Swing applications and applets look better. They have been optimized for readability, precise micro-design and usability. And they simplify the multi-platform support by using similar widget dimensions. In addition, many people have reviewed them as elegant.
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/*
 * Copyright (c) 2001-2012 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  o Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  o Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 *  o Neither the name of JGoodies Karsten Lentzsch nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jgoodies.looks.plastic;

import java.awt.Component;
import java.awt.Insets;
import java.awt.LayoutManager;

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicSpinnerUI;

import com.jgoodies.looks.common.ExtBasicSpinnerLayout;


/**
 * The JGoodies Plastic Look&Feel implementation of {@code SpinnerUI}.
 * Configures the default editor to adjust font baselines and component
 * bounds. Also, changes the border of the buttons and the size of the arrows.
 *
 * @author Karsten Lentzsch
 * @version $Revision: 1.13 $
 */
public class PlasticSpinnerUI extends BasicSpinnerUI {


	public static ComponentUI createUI(JComponent b) {
		return new PlasticSpinnerUI();
	}


    protected Component createArrowButton(int direction) {
        return new SpinnerArrowButton(direction);
    }


    /**
     * Create a {@code LayoutManager} that manages the {@code editor},
     * {@code nextButton}, and {@code previousButton} children
     * of the JSpinner. These three children must be added with a constraint
     * that identifies their role: "Editor", "Next", and "Previous". The
     * default layout manager can handle the absence of any of these children.
     *
     * @return a LayoutManager for the editor, next button, and previous
     *         button.
     * @see #createNextButton
     * @see #createPreviousButton
     * @see #createEditor
     */
    @Override
    protected LayoutManager createLayout() {
        return new ExtBasicSpinnerLayout();
    }


    /**
     * This method is called by installUI to get the editor component
     * of the {@code JSpinner}.  By default it just returns
     * {@code JSpinner.getEditor()}.  Subclasses can override
     * {@code createEditor} to return a component that contains
     * the spinner's editor or null, if they're going to handle adding
     * the editor to the {@code JSpinner} in an
     * {@code installUI} override.
     * 
     * Typically this method would be overridden to wrap the editor
     * with a container with a custom border, since one can't assume
     * that the editors border can be set directly.
     * 

     * The {@code replaceEditor} method is called when the spinners
     * editor is changed with {@code JSpinner.setEditor}.  If you've
     * overriden this method, then you'll probably want to override
     * {@code replaceEditor} as well.
     *
     * @return the JSpinners editor JComponent, spinner.getEditor() by default
     * @see #installUI
     * @see #replaceEditor
     * @see JSpinner#getEditor
     */
    @Override
    protected JComponent createEditor() {
		JComponent editor = spinner.getEditor();
		configureEditorBorder(editor);
		return editor;
    }

    /**
     * Called by the {@code PropertyChangeListener} when the
     * {@code JSpinner} editor property changes.  It's the responsibility
     * of this method to remove the old editor and add the new one.  By
     * default this operation is just:
     * 
     * spinner.remove(oldEditor);
     * spinner.add(newEditor, "Editor");
     * 
     * The implementation of {@code replaceEditor} should be coordinated
     * with the {@code createEditor} method.
     *
     * @see #createEditor
     * @see #createPropertyChangeListener
     */
    @Override
    protected void replaceEditor(JComponent oldEditor, JComponent newEditor) {
		spinner.remove(oldEditor);
		configureEditorBorder(newEditor);
		spinner.add(newEditor, "Editor");
    }


    /**
     * Sets an empty border with the default text insets.
     */
    private static void configureEditorBorder(JComponent editor) {
        if (editor instanceof JSpinner.DefaultEditor) {
            JSpinner.DefaultEditor defaultEditor = (JSpinner.DefaultEditor) editor;
            JTextField editorField = defaultEditor.getTextField();
            Insets insets = UIManager.getInsets("Spinner.defaultEditorInsets");
            editorField.setBorder(new EmptyBorder(insets));
        } else if (   editor instanceof JPanel
                && editor.getBorder() == null
                && editor.getComponentCount() > 0) {
            JComponent editorField = (JComponent) editor.getComponent(0);
            Insets insets = UIManager.getInsets("Spinner.defaultEditorInsets");
            editorField.setBorder(new EmptyBorder(insets));
        }
    }

    /**
     * It differs from its superclass in that it uses the same formula as JDK
     * to calculate the arrow height.
     */
    private static final class SpinnerArrowButton extends PlasticArrowButton {
        private SpinnerArrowButton(int direction) {
            super(direction, UIManager.getInt("ScrollBar.width"), true);
        }

        @Override
        protected int calculateArrowHeight(int height, int width) {
            int arrowHeight = Math.min((height - 4) / 3, (width - 4) / 3);
            return Math.max(arrowHeight, 3);
        }

        @Override
        protected int calculateArrowOffset() {
            return 1;
        }

        @Override
        protected boolean isPaintingNorthBottom() {
            return true;
        }

   }

}