/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.swing.plaf.basic;

import java.awt.event.*;
import java.awt.*;
import java.beans.*;
import java.util.Dictionary;
import java.util.Enumeration;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import sun.swing.DefaultLookup;
import sun.swing.UIAction;


A Basic L&F implementation of SliderUI.
Author:
Tom Santos/**
 * A Basic L&F implementation of SliderUI.
 *
 * @author Tom Santos
 */
public class BasicSliderUI extends SliderUI{
    // Old actions forward to an instance of this.
    private static final Actions SHARED_ACTION = new Actions();

    public static final int POSITIVE_SCROLL = +1;
    public static final int NEGATIVE_SCROLL = -1;
    public static final int MIN_SCROLL = -2;
    public static final int MAX_SCROLL = +2;

    protected Timer scrollTimer;
    protected JSlider slider;

    protected Insets focusInsets = null;
    protected Insets insetCache = null;
    protected boolean leftToRightCache = true;
    protected Rectangle focusRect = null;
    protected Rectangle contentRect = null;
    protected Rectangle labelRect = null;
    protected Rectangle tickRect = null;
    protected Rectangle trackRect = null;
    protected Rectangle thumbRect = null;

    protected int trackBuffer = 0;  // The distance that the track is from the side of the control

    private transient boolean isDragging;

    protected TrackListener trackListener;
    protected ChangeListener changeListener;
    protected ComponentListener componentListener;
    protected FocusListener focusListener;
    protected ScrollListener scrollListener;
    protected PropertyChangeListener propertyChangeListener;
    private Handler handler;
    private int lastValue;

    // Colors
    private Color shadowColor;
    private Color highlightColor;
    private Color focusColor;

    
Whther or not sameLabelBaselines is up to date.
/**
     * Whther or not sameLabelBaselines is up to date.
     */
    private boolean checkedLabelBaselines;
    
Whether or not all the entries in the labeltable have the same
baseline.
/**
     * Whether or not all the entries in the labeltable have the same
     * baseline.
     */
    private boolean sameLabelBaselines;


    protected Color getShadowColor() {
        return shadowColor;
    }

    protected Color getHighlightColor() {
        return highlightColor;
    }

    protected Color getFocusColor() {
        return focusColor;
    }

    
Returns true if the user is dragging the slider.
Returns:
true if the user is dragging the slider
Since:
1.5/**
     * Returns true if the user is dragging the slider.
     *
     * @return true if the user is dragging the slider
     * @since 1.5
     */
    protected boolean isDragging() {
        return isDragging;
    }

    /////////////////////////////////////////////////////////////////////////////
    // ComponentUI Interface Implementation methods
    /////////////////////////////////////////////////////////////////////////////
    public static ComponentUI createUI(JComponent b)    {
        return new BasicSliderUI((JSlider)b);
    }

    public BasicSliderUI(JSlider b)   {
    }

    public void installUI(JComponent c)   {
        slider = (JSlider) c;

        checkedLabelBaselines = false;

        slider.setEnabled(slider.isEnabled());
        LookAndFeel.installProperty(slider, "opaque", Boolean.TRUE);

        isDragging = false;
        trackListener = createTrackListener( slider );
        changeListener = createChangeListener( slider );
        componentListener = createComponentListener( slider );
        focusListener = createFocusListener( slider );
        scrollListener = createScrollListener( slider );
        propertyChangeListener = createPropertyChangeListener( slider );

        installDefaults( slider );
        installListeners( slider );
        installKeyboardActions( slider );

        scrollTimer = new Timer( 100, scrollListener );
        scrollTimer.setInitialDelay( 300 );

        insetCache = slider.getInsets();
        leftToRightCache = BasicGraphicsUtils.isLeftToRight(slider);
        focusRect = new Rectangle();
        contentRect = new Rectangle();
        labelRect = new Rectangle();
        tickRect = new Rectangle();
        trackRect = new Rectangle();
        thumbRect = new Rectangle();
        lastValue = slider.getValue();

        calculateGeometry(); // This figures out where the labels, ticks, track, and thumb are.
    }

    public void uninstallUI(JComponent c) {
        if ( c != slider )
            throw new IllegalComponentStateException(
                                                    this + " was asked to deinstall() "
                                                    + c + " when it only knows about "
                                                    + slider + ".");

        scrollTimer.stop();
        scrollTimer = null;

        uninstallDefaults(slider);
        uninstallListeners( slider );
        uninstallKeyboardActions(slider);

        insetCache = null;
        leftToRightCache = true;
        focusRect = null;
        contentRect = null;
        labelRect = null;
        tickRect = null;
        trackRect = null;
        thumbRect = null;
        trackListener = null;
        changeListener = null;
        componentListener = null;
        focusListener = null;
        scrollListener = null;
        propertyChangeListener = null;
        slider = null;
    }

    protected void installDefaults( JSlider slider ) {
        LookAndFeel.installBorder(slider, "Slider.border");
        LookAndFeel.installColorsAndFont(slider, "Slider.background",
                                         "Slider.foreground", "Slider.font");
        highlightColor = UIManager.getColor("Slider.highlight");

        shadowColor = UIManager.getColor("Slider.shadow");
        focusColor = UIManager.getColor("Slider.focus");

        focusInsets = (Insets)UIManager.get( "Slider.focusInsets" );
        // use default if missing so that BasicSliderUI can be used in other
        // LAFs like Nimbus
        if (focusInsets == null) focusInsets = new InsetsUIResource(2,2,2,2);
    }

    protected void uninstallDefaults(JSlider slider) {
        LookAndFeel.uninstallBorder(slider);

        focusInsets = null;
    }

    protected TrackListener createTrackListener(JSlider slider) {
        return new TrackListener();
    }

    protected ChangeListener createChangeListener(JSlider slider) {
        return getHandler();
    }

    protected ComponentListener createComponentListener(JSlider slider) {
        return getHandler();
    }

    protected FocusListener createFocusListener(JSlider slider) {
        return getHandler();
    }

    protected ScrollListener createScrollListener( JSlider slider ) {
        return new ScrollListener();
    }

    protected PropertyChangeListener createPropertyChangeListener(
            JSlider slider) {
        return getHandler();
    }

    private Handler getHandler() {
        if (handler == null) {
            handler = new Handler();
        }
        return handler;
    }

    protected void installListeners( JSlider slider ) {
        slider.addMouseListener(trackListener);
        slider.addMouseMotionListener(trackListener);
        slider.addFocusListener(focusListener);
        slider.addComponentListener(componentListener);
        slider.addPropertyChangeListener( propertyChangeListener );
        slider.getModel().addChangeListener(changeListener);
    }

    protected void uninstallListeners( JSlider slider ) {
        slider.removeMouseListener(trackListener);
        slider.removeMouseMotionListener(trackListener);
        slider.removeFocusListener(focusListener);
        slider.removeComponentListener(componentListener);
        slider.removePropertyChangeListener( propertyChangeListener );
        slider.getModel().removeChangeListener(changeListener);
        handler = null;
    }

    protected void installKeyboardActions( JSlider slider ) {
        InputMap km = getInputMap(JComponent.WHEN_FOCUSED, slider);
        SwingUtilities.replaceUIInputMap(slider, JComponent.WHEN_FOCUSED, km);
        LazyActionMap.installLazyActionMap(slider, BasicSliderUI.class,
                "Slider.actionMap");
    }

    InputMap getInputMap(int condition, JSlider slider) {
        if (condition == JComponent.WHEN_FOCUSED) {
            InputMap keyMap = (InputMap)DefaultLookup.get(slider, this,
                  "Slider.focusInputMap");
            InputMap rtlKeyMap;

            if (slider.getComponentOrientation().isLeftToRight() ||
                ((rtlKeyMap = (InputMap)DefaultLookup.get(slider, this,
                          "Slider.focusInputMap.RightToLeft")) == null)) {
                return keyMap;
            } else {
                rtlKeyMap.setParent(keyMap);
                return rtlKeyMap;
            }
        }
        return null;
    }

    
Populates ComboBox's actions.
/**
     * Populates ComboBox's actions.
     */
    static void loadActionMap(LazyActionMap map) {
        map.put(new Actions(Actions.POSITIVE_UNIT_INCREMENT));
        map.put(new Actions(Actions.POSITIVE_BLOCK_INCREMENT));
        map.put(new Actions(Actions.NEGATIVE_UNIT_INCREMENT));
        map.put(new Actions(Actions.NEGATIVE_BLOCK_INCREMENT));
        map.put(new Actions(Actions.MIN_SCROLL_INCREMENT));
        map.put(new Actions(Actions.MAX_SCROLL_INCREMENT));
    }

    protected void uninstallKeyboardActions( JSlider slider ) {
        SwingUtilities.replaceUIActionMap(slider, null);
        SwingUtilities.replaceUIInputMap(slider, JComponent.WHEN_FOCUSED,
                                         null);
    }


    
Returns the baseline.
Throws:
NullPointerException – {@inheritDoc}
IllegalArgumentException – {@inheritDoc}
See Also:
JComponent.getBaseline(int, int)
Since:
1.6/**
     * Returns the baseline.
     *
     * @throws NullPointerException {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public int getBaseline(JComponent c, int width, int height) {
        super.getBaseline(c, width, height);
        if (slider.getPaintLabels() && labelsHaveSameBaselines()) {
            FontMetrics metrics = slider.getFontMetrics(slider.getFont());
            Insets insets = slider.getInsets();
            Dimension thumbSize = getThumbSize();
            if (slider.getOrientation() == JSlider.HORIZONTAL) {
                int tickLength = getTickLength();
                int contentHeight = height - insets.top - insets.bottom -
                    focusInsets.top - focusInsets.bottom;
                int thumbHeight = thumbSize.height;
                int centerSpacing = thumbHeight;
                if (slider.getPaintTicks()) {
                    centerSpacing += tickLength;
                }
                // Assume uniform labels.
                centerSpacing += getHeightOfTallestLabel();
                int trackY = insets.top + focusInsets.top +
                    (contentHeight - centerSpacing - 1) / 2;
                int trackHeight = thumbHeight;
                int tickY = trackY + trackHeight;
                int tickHeight = tickLength;
                if (!slider.getPaintTicks()) {
                    tickHeight = 0;
                }
                int labelY = tickY + tickHeight;
                return labelY + metrics.getAscent();
            }
            else { // vertical
                boolean inverted = slider.getInverted();
                Integer value = inverted ? getLowestValue() :
                                           getHighestValue();
                if (value != null) {
                    int thumbHeight = thumbSize.height;
                    int trackBuffer = Math.max(metrics.getHeight() / 2,
                                               thumbHeight / 2);
                    int contentY = focusInsets.top + insets.top;
                    int trackY = contentY + trackBuffer;
                    int trackHeight = height - focusInsets.top -
                        focusInsets.bottom - insets.top - insets.bottom -
                        trackBuffer - trackBuffer;
                    int yPosition = yPositionForValue(value, trackY,
                                                      trackHeight);
                    return yPosition - metrics.getHeight() / 2 +
                        metrics.getAscent();
                }
            }
        }
        return 0;
    }

    
Returns an enum indicating how the baseline of the component
changes as the size changes.
Throws:
NullPointerException – {@inheritDoc}
See Also:
JComponent.getBaseline(int, int)
Since:
1.6/**
     * Returns an enum indicating how the baseline of the component
     * changes as the size changes.
     *
     * @throws NullPointerException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public Component.BaselineResizeBehavior getBaselineResizeBehavior(
            JComponent c) {
        super.getBaselineResizeBehavior(c);
        // NOTE: BasicSpinner really provides for CENTER_OFFSET, but
        // the default min/pref size is smaller than it should be
        // so that getBaseline() doesn't implement the contract
        // for CENTER_OFFSET as defined in Component.
        return Component.BaselineResizeBehavior.OTHER;
    }

    
Returns true if all the labels from the label table have the same
baseline.
Returns:
true if all the labels from the label table have the
        same baseline
Since:
1.6/**
     * Returns true if all the labels from the label table have the same
     * baseline.
     *
     * @return true if all the labels from the label table have the
     *         same baseline
     * @since 1.6
     */
    protected boolean labelsHaveSameBaselines() {
        if (!checkedLabelBaselines) {
            checkedLabelBaselines = true;
            Dictionary dictionary = slider.getLabelTable();
            if (dictionary != null) {
                sameLabelBaselines = true;
                Enumeration elements = dictionary.elements();
                int baseline = -1;
                while (elements.hasMoreElements()) {
                    JComponent label = (JComponent) elements.nextElement();
                    Dimension pref = label.getPreferredSize();
                    int labelBaseline = label.getBaseline(pref.width,
                                                          pref.height);
                    if (labelBaseline >= 0) {
                        if (baseline == -1) {
                            baseline = labelBaseline;
                        }
                        else if (baseline != labelBaseline) {
                            sameLabelBaselines = false;
                            break;
                        }
                    }
                    else {
                        sameLabelBaselines = false;
                        break;
                    }
                }
            }
            else {
                sameLabelBaselines = false;
            }
        }
        return sameLabelBaselines;
    }

    public Dimension getPreferredHorizontalSize() {
        Dimension horizDim = (Dimension)DefaultLookup.get(slider,
                this, "Slider.horizontalSize");
        if (horizDim == null) {
            horizDim = new Dimension(200, 21);
        }
        return horizDim;
    }

    public Dimension getPreferredVerticalSize() {
        Dimension vertDim = (Dimension)DefaultLookup.get(slider,
                this, "Slider.verticalSize");
        if (vertDim == null) {
            vertDim = new Dimension(21, 200);
        }
        return vertDim;
    }

    public Dimension getMinimumHorizontalSize() {
        Dimension minHorizDim = (Dimension)DefaultLookup.get(slider,
                this, "Slider.minimumHorizontalSize");
        if (minHorizDim == null) {
            minHorizDim = new Dimension(36, 21);
        }
        return minHorizDim;
    }

    public Dimension getMinimumVerticalSize() {
        Dimension minVertDim = (Dimension)DefaultLookup.get(slider,
                this, "Slider.minimumVerticalSize");
        if (minVertDim == null) {
            minVertDim = new Dimension(21, 36);
        }
        return minVertDim;
    }

    public Dimension getPreferredSize(JComponent c)    {
        recalculateIfInsetsChanged();
        Dimension d;
        if ( slider.getOrientation() == JSlider.VERTICAL ) {
            d = new Dimension(getPreferredVerticalSize());
            d.width = insetCache.left + insetCache.right;
            d.width += focusInsets.left + focusInsets.right;
            d.width += trackRect.width + tickRect.width + labelRect.width;
        }
        else {
            d = new Dimension(getPreferredHorizontalSize());
            d.height = insetCache.top + insetCache.bottom;
            d.height += focusInsets.top + focusInsets.bottom;
            d.height += trackRect.height + tickRect.height + labelRect.height;
        }

        return d;
    }

    public Dimension getMinimumSize(JComponent c)  {
        recalculateIfInsetsChanged();
        Dimension d;

        if ( slider.getOrientation() == JSlider.VERTICAL ) {
            d = new Dimension(getMinimumVerticalSize());
            d.width = insetCache.left + insetCache.right;
            d.width += focusInsets.left + focusInsets.right;
            d.width += trackRect.width + tickRect.width + labelRect.width;
        }
        else {
            d = new Dimension(getMinimumHorizontalSize());
            d.height = insetCache.top + insetCache.bottom;
            d.height += focusInsets.top + focusInsets.bottom;
            d.height += trackRect.height + tickRect.height + labelRect.height;
        }

        return d;
    }

    public Dimension getMaximumSize(JComponent c) {
        Dimension d = getPreferredSize(c);
        if ( slider.getOrientation() == JSlider.VERTICAL ) {
            d.height = Short.MAX_VALUE;
        }
        else {
            d.width = Short.MAX_VALUE;
        }

        return d;
    }

    protected void calculateGeometry() {
        calculateFocusRect();
        calculateContentRect();
        calculateThumbSize();
        calculateTrackBuffer();
        calculateTrackRect();
        calculateTickRect();
        calculateLabelRect();
        calculateThumbLocation();
    }

    protected void calculateFocusRect() {
        focusRect.x = insetCache.left;
        focusRect.y = insetCache.top;
        focusRect.width = slider.getWidth() - (insetCache.left + insetCache.right);
        focusRect.height = slider.getHeight() - (insetCache.top + insetCache.bottom);
    }

    protected void calculateThumbSize() {
        Dimension size = getThumbSize();
        thumbRect.setSize( size.width, size.height );
    }

    protected void calculateContentRect() {
        contentRect.x = focusRect.x + focusInsets.left;
        contentRect.y = focusRect.y + focusInsets.top;
        contentRect.width = focusRect.width - (focusInsets.left + focusInsets.right);
        contentRect.height = focusRect.height - (focusInsets.top + focusInsets.bottom);
    }

    private int getTickSpacing() {
        int majorTickSpacing = slider.getMajorTickSpacing();
        int minorTickSpacing = slider.getMinorTickSpacing();

        int result;

        if (minorTickSpacing > 0) {
            result = minorTickSpacing;
        } else if (majorTickSpacing > 0) {
            result = majorTickSpacing;
        } else {
            result = 0;
        }

        return result;
    }

    protected void calculateThumbLocation() {
        if ( slider.getSnapToTicks() ) {
            int sliderValue = slider.getValue();
            int snappedValue = sliderValue;
            int tickSpacing = getTickSpacing();

            if ( tickSpacing != 0 ) {
                // If it's not on a tick, change the value
                if ( (sliderValue - slider.getMinimum()) % tickSpacing != 0 ) {
                    float temp = (float)(sliderValue - slider.getMinimum()) / (float)tickSpacing;
                    int whichTick = Math.round( temp );

                    // This is the fix for the bug #6401380
                    if (temp - (int)temp == .5 && sliderValue < lastValue) {
                      whichTick --;
                    }
                    snappedValue = slider.getMinimum() + (whichTick * tickSpacing);
                }

                if( snappedValue != sliderValue ) {
                    slider.setValue( snappedValue );
                }
            }
        }

        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            int valuePosition = xPositionForValue(slider.getValue());

            thumbRect.x = valuePosition - (thumbRect.width / 2);
            thumbRect.y = trackRect.y;
        }
        else {
            int valuePosition = yPositionForValue(slider.getValue());

            thumbRect.x = trackRect.x;
            thumbRect.y = valuePosition - (thumbRect.height / 2);
        }
    }

    protected void calculateTrackBuffer() {
        if ( slider.getPaintLabels() && slider.getLabelTable()  != null ) {
            Component highLabel = getHighestValueLabel();
            Component lowLabel = getLowestValueLabel();

            if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
                trackBuffer = Math.max( highLabel.getBounds().width, lowLabel.getBounds().width ) / 2;
                trackBuffer = Math.max( trackBuffer, thumbRect.width / 2 );
            }
            else {
                trackBuffer = Math.max( highLabel.getBounds().height, lowLabel.getBounds().height ) / 2;
                trackBuffer = Math.max( trackBuffer, thumbRect.height / 2 );
            }
        }
        else {
            if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
                trackBuffer = thumbRect.width / 2;
            }
            else {
                trackBuffer = thumbRect.height / 2;
            }
        }
    }


    protected void calculateTrackRect() {
        int centerSpacing; // used to center sliders added using BorderLayout.CENTER (bug 4275631)
        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            centerSpacing = thumbRect.height;
            if ( slider.getPaintTicks() ) centerSpacing += getTickLength();
            if ( slider.getPaintLabels() ) centerSpacing += getHeightOfTallestLabel();
            trackRect.x = contentRect.x + trackBuffer;
            trackRect.y = contentRect.y + (contentRect.height - centerSpacing - 1)/2;
            trackRect.width = contentRect.width - (trackBuffer * 2);
            trackRect.height = thumbRect.height;
        }
        else {
            centerSpacing = thumbRect.width;
            if (BasicGraphicsUtils.isLeftToRight(slider)) {
                if ( slider.getPaintTicks() ) centerSpacing += getTickLength();
                if ( slider.getPaintLabels() ) centerSpacing += getWidthOfWidestLabel();
            } else {
                if ( slider.getPaintTicks() ) centerSpacing -= getTickLength();
                if ( slider.getPaintLabels() ) centerSpacing -= getWidthOfWidestLabel();
            }
            trackRect.x = contentRect.x + (contentRect.width - centerSpacing - 1)/2;
            trackRect.y = contentRect.y + trackBuffer;
            trackRect.width = thumbRect.width;
            trackRect.height = contentRect.height - (trackBuffer * 2);
        }

    }

    
Gets the height of the tick area for horizontal sliders and the width of the
tick area for vertical sliders.  BasicSliderUI uses the returned value to
determine the tick area rectangle.  If you want to give your ticks some room,
make this larger than you need and paint your ticks away from the sides in paintTicks().
/**
     * Gets the height of the tick area for horizontal sliders and the width of the
     * tick area for vertical sliders.  BasicSliderUI uses the returned value to
     * determine the tick area rectangle.  If you want to give your ticks some room,
     * make this larger than you need and paint your ticks away from the sides in paintTicks().
     */
    protected int getTickLength() {
        return 8;
    }

    protected void calculateTickRect() {
        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            tickRect.x = trackRect.x;
            tickRect.y = trackRect.y + trackRect.height;
            tickRect.width = trackRect.width;
            tickRect.height = (slider.getPaintTicks()) ? getTickLength() : 0;
        }
        else {
            tickRect.width = (slider.getPaintTicks()) ? getTickLength() : 0;
            if(BasicGraphicsUtils.isLeftToRight(slider)) {
                tickRect.x = trackRect.x + trackRect.width;
            }
            else {
                tickRect.x = trackRect.x - tickRect.width;
            }
            tickRect.y = trackRect.y;
            tickRect.height = trackRect.height;
        }
    }

    protected void calculateLabelRect() {
        if ( slider.getPaintLabels() ) {
            if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
                labelRect.x = tickRect.x - trackBuffer;
                labelRect.y = tickRect.y + tickRect.height;
                labelRect.width = tickRect.width + (trackBuffer * 2);
                labelRect.height = getHeightOfTallestLabel();
            }
            else {
                if(BasicGraphicsUtils.isLeftToRight(slider)) {
                    labelRect.x = tickRect.x + tickRect.width;
                    labelRect.width = getWidthOfWidestLabel();
                }
                else {
                    labelRect.width = getWidthOfWidestLabel();
                    labelRect.x = tickRect.x - labelRect.width;
                }
                labelRect.y = tickRect.y - trackBuffer;
                labelRect.height = tickRect.height + (trackBuffer * 2);
            }
        }
        else {
            if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
                labelRect.x = tickRect.x;
                labelRect.y = tickRect.y + tickRect.height;
                labelRect.width = tickRect.width;
                labelRect.height = 0;
            }
            else {
                if(BasicGraphicsUtils.isLeftToRight(slider)) {
                    labelRect.x = tickRect.x + tickRect.width;
                }
                else {
                    labelRect.x = tickRect.x;
                }
                labelRect.y = tickRect.y;
                labelRect.width = 0;
                labelRect.height = tickRect.height;
            }
        }
    }

    protected Dimension getThumbSize() {
        Dimension size = new Dimension();

        if ( slider.getOrientation() == JSlider.VERTICAL ) {
            size.width = 20;
            size.height = 11;
        }
        else {
            size.width = 11;
            size.height = 20;
        }

        return size;
    }

    public class PropertyChangeHandler implements PropertyChangeListener {
        // NOTE: This class exists only for backward compatibility. All
        // its functionality has been moved into Handler. If you need to add
        // new functionality add it to the Handler, but make sure this
        // class calls into the Handler.
        public void propertyChange( PropertyChangeEvent e ) {
            getHandler().propertyChange(e);
        }
    }

    protected int getWidthOfWidestLabel() {
        Dictionary dictionary = slider.getLabelTable();
        int widest = 0;
        if ( dictionary != null ) {
            Enumeration keys = dictionary.keys();
            while ( keys.hasMoreElements() ) {
                JComponent label = (JComponent) dictionary.get(keys.nextElement());
                widest = Math.max( label.getPreferredSize().width, widest );
            }
        }
        return widest;
    }

    protected int getHeightOfTallestLabel() {
        Dictionary dictionary = slider.getLabelTable();
        int tallest = 0;
        if ( dictionary != null ) {
            Enumeration keys = dictionary.keys();
            while ( keys.hasMoreElements() ) {
                JComponent label = (JComponent) dictionary.get(keys.nextElement());
                tallest = Math.max( label.getPreferredSize().height, tallest );
            }
        }
        return tallest;
    }

    protected int getWidthOfHighValueLabel() {
        Component label = getHighestValueLabel();
        int width = 0;

        if ( label != null ) {
            width = label.getPreferredSize().width;
        }

        return width;
    }

    protected int getWidthOfLowValueLabel() {
        Component label = getLowestValueLabel();
        int width = 0;

        if ( label != null ) {
            width = label.getPreferredSize().width;
        }

        return width;
    }

    protected int getHeightOfHighValueLabel() {
        Component label = getHighestValueLabel();
        int height = 0;

        if ( label != null ) {
            height = label.getPreferredSize().height;
        }

        return height;
    }

    protected int getHeightOfLowValueLabel() {
        Component label = getLowestValueLabel();
        int height = 0;

        if ( label != null ) {
            height = label.getPreferredSize().height;
        }

        return height;
    }

    protected boolean drawInverted() {
        if (slider.getOrientation()==JSlider.HORIZONTAL) {
            if(BasicGraphicsUtils.isLeftToRight(slider)) {
                return slider.getInverted();
            } else {
                return !slider.getInverted();
            }
        } else {
            return slider.getInverted();
        }
    }

    
Returns the biggest value that has an entry in the label table.
Returns:
biggest value that has an entry in the label table, or
        null.
Since:
1.6/**
     * Returns the biggest value that has an entry in the label table.
     *
     * @return biggest value that has an entry in the label table, or
     *         null.
     * @since 1.6
     */
    protected Integer getHighestValue() {
        Dictionary dictionary = slider.getLabelTable();

        if (dictionary == null) {
            return null;
        }

        Enumeration keys = dictionary.keys();

        Integer max = null;

        while (keys.hasMoreElements()) {
            Integer i = (Integer) keys.nextElement();

            if (max == null || i > max) {
                max = i;
            }
        }

        return max;
    }

    
Returns the smallest value that has an entry in the label table.
Returns:
smallest value that has an entry in the label table, or
        null.
Since:
1.6/**
     * Returns the smallest value that has an entry in the label table.
     *
     * @return smallest value that has an entry in the label table, or
     *         null.
     * @since 1.6
     */
    protected Integer getLowestValue() {
        Dictionary dictionary = slider.getLabelTable();

        if (dictionary == null) {
            return null;
        }

        Enumeration keys = dictionary.keys();

        Integer min = null;

        while (keys.hasMoreElements()) {
            Integer i = (Integer) keys.nextElement();

            if (min == null || i < min) {
                min = i;
            }
        }

        return min;
    }


    
Returns the label that corresponds to the highest slider value in the label table.
See Also:
setLabelTable.setLabelTable/**
     * Returns the label that corresponds to the highest slider value in the label table.
     * @see JSlider#setLabelTable
     */
    protected Component getLowestValueLabel() {
        Integer min = getLowestValue();
        if (min != null) {
            return (Component)slider.getLabelTable().get(min);
        }
        return null;
    }

    
Returns the label that corresponds to the lowest slider value in the label table.
See Also:
setLabelTable.setLabelTable/**
     * Returns the label that corresponds to the lowest slider value in the label table.
     * @see JSlider#setLabelTable
     */
    protected Component getHighestValueLabel() {
        Integer max = getHighestValue();
        if (max != null) {
            return (Component)slider.getLabelTable().get(max);
        }
        return null;
    }

    public void paint( Graphics g, JComponent c )   {
        recalculateIfInsetsChanged();
        recalculateIfOrientationChanged();
        Rectangle clip = g.getClipBounds();

        if ( !clip.intersects(trackRect) && slider.getPaintTrack())
            calculateGeometry();

        if ( slider.getPaintTrack() && clip.intersects( trackRect ) ) {
            paintTrack( g );
        }
        if ( slider.getPaintTicks() && clip.intersects( tickRect ) ) {
            paintTicks( g );
        }
        if ( slider.getPaintLabels() && clip.intersects( labelRect ) ) {
            paintLabels( g );
        }
        if ( slider.hasFocus() && clip.intersects( focusRect ) ) {
            paintFocus( g );
        }
        if ( clip.intersects( thumbRect ) ) {
            paintThumb( g );
        }
    }

    protected void recalculateIfInsetsChanged() {
        Insets newInsets = slider.getInsets();
        if ( !newInsets.equals( insetCache ) ) {
            insetCache = newInsets;
            calculateGeometry();
        }
    }

    protected void recalculateIfOrientationChanged() {
        boolean ltr = BasicGraphicsUtils.isLeftToRight(slider);
        if ( ltr!=leftToRightCache ) {
            leftToRightCache = ltr;
            calculateGeometry();
        }
    }

    public void paintFocus(Graphics g)  {
        g.setColor( getFocusColor() );

        BasicGraphicsUtils.drawDashedRect( g, focusRect.x, focusRect.y,
                                           focusRect.width, focusRect.height );
    }

    public void paintTrack(Graphics g)  {

        Rectangle trackBounds = trackRect;

        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            int cy = (trackBounds.height / 2) - 2;
            int cw = trackBounds.width;

            g.translate(trackBounds.x, trackBounds.y + cy);

            g.setColor(getShadowColor());
            g.drawLine(0, 0, cw - 1, 0);
            g.drawLine(0, 1, 0, 2);
            g.setColor(getHighlightColor());
            g.drawLine(0, 3, cw, 3);
            g.drawLine(cw, 0, cw, 3);
            g.setColor(Color.black);
            g.drawLine(1, 1, cw-2, 1);

            g.translate(-trackBounds.x, -(trackBounds.y + cy));
        }
        else {
            int cx = (trackBounds.width / 2) - 2;
            int ch = trackBounds.height;

            g.translate(trackBounds.x + cx, trackBounds.y);

            g.setColor(getShadowColor());
            g.drawLine(0, 0, 0, ch - 1);
            g.drawLine(1, 0, 2, 0);
            g.setColor(getHighlightColor());
            g.drawLine(3, 0, 3, ch);
            g.drawLine(0, ch, 3, ch);
            g.setColor(Color.black);
            g.drawLine(1, 1, 1, ch-2);

            g.translate(-(trackBounds.x + cx), -trackBounds.y);
        }
    }

    public void paintTicks(Graphics g)  {
        Rectangle tickBounds = tickRect;

        g.setColor(DefaultLookup.getColor(slider, this, "Slider.tickColor", Color.black));

        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            g.translate(0, tickBounds.y);

            if (slider.getMinorTickSpacing() > 0) {
                int value = slider.getMinimum();

                while ( value <= slider.getMaximum() ) {
                    int xPos = xPositionForValue(value);
                    paintMinorTickForHorizSlider( g, tickBounds, xPos );

                    // Overflow checking
                    if (Integer.MAX_VALUE - slider.getMinorTickSpacing() < value) {
                        break;
                    }

                    value += slider.getMinorTickSpacing();
                }
            }

            if (slider.getMajorTickSpacing() > 0) {
                int value = slider.getMinimum();

                while ( value <= slider.getMaximum() ) {
                    int xPos = xPositionForValue(value);
                    paintMajorTickForHorizSlider( g, tickBounds, xPos );

                    // Overflow checking
                    if (Integer.MAX_VALUE - slider.getMajorTickSpacing() < value) {
                        break;
                    }

                    value += slider.getMajorTickSpacing();
                }
            }

            g.translate( 0, -tickBounds.y);
        } else {
            g.translate(tickBounds.x, 0);

            if (slider.getMinorTickSpacing() > 0) {
                int offset = 0;
                if(!BasicGraphicsUtils.isLeftToRight(slider)) {
                    offset = tickBounds.width - tickBounds.width / 2;
                    g.translate(offset, 0);
                }

                int value = slider.getMinimum();

                while (value <= slider.getMaximum()) {
                    int yPos = yPositionForValue(value);
                    paintMinorTickForVertSlider( g, tickBounds, yPos );

                    // Overflow checking
                    if (Integer.MAX_VALUE - slider.getMinorTickSpacing() < value) {
                        break;
                    }

                    value += slider.getMinorTickSpacing();
                }

                if(!BasicGraphicsUtils.isLeftToRight(slider)) {
                    g.translate(-offset, 0);
                }
            }

            if (slider.getMajorTickSpacing() > 0) {
                if(!BasicGraphicsUtils.isLeftToRight(slider)) {
                    g.translate(2, 0);
                }

                int value = slider.getMinimum();

                while (value <= slider.getMaximum()) {
                    int yPos = yPositionForValue(value);
                    paintMajorTickForVertSlider( g, tickBounds, yPos );

                    // Overflow checking
                    if (Integer.MAX_VALUE - slider.getMajorTickSpacing() < value) {
                        break;
                    }

                    value += slider.getMajorTickSpacing();
                }

                if(!BasicGraphicsUtils.isLeftToRight(slider)) {
                    g.translate(-2, 0);
                }
            }
            g.translate(-tickBounds.x, 0);
        }
    }

    protected void paintMinorTickForHorizSlider( Graphics g, Rectangle tickBounds, int x ) {
        g.drawLine( x, 0, x, tickBounds.height / 2 - 1 );
    }

    protected void paintMajorTickForHorizSlider( Graphics g, Rectangle tickBounds, int x ) {
        g.drawLine( x, 0, x, tickBounds.height - 2 );
    }

    protected void paintMinorTickForVertSlider( Graphics g, Rectangle tickBounds, int y ) {
        g.drawLine( 0, y, tickBounds.width / 2 - 1, y );
    }

    protected void paintMajorTickForVertSlider( Graphics g, Rectangle tickBounds, int y ) {
        g.drawLine( 0, y,  tickBounds.width - 2, y );
    }

    public void paintLabels( Graphics g ) {
        Rectangle labelBounds = labelRect;

        Dictionary dictionary = slider.getLabelTable();
        if ( dictionary != null ) {
            Enumeration keys = dictionary.keys();
            int minValue = slider.getMinimum();
            int maxValue = slider.getMaximum();
            boolean enabled = slider.isEnabled();
            while ( keys.hasMoreElements() ) {
                Integer key = (Integer)keys.nextElement();
                int value = key.intValue();
                if (value >= minValue && value <= maxValue) {
                    JComponent label = (JComponent) dictionary.get(key);
                    label.setEnabled(enabled);

                    if (label instanceof JLabel) {
                        Icon icon = label.isEnabled() ? ((JLabel) label).getIcon() : ((JLabel) label).getDisabledIcon();

                        if (icon instanceof ImageIcon) {
                            // Register Slider as an image observer. It allows to catch notifications about
                            // image changes (e.g. gif animation)
                            Toolkit.getDefaultToolkit().checkImage(((ImageIcon) icon).getImage(), -1, -1, slider);
                        }
                    }

                    if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
                        g.translate( 0, labelBounds.y );
                        paintHorizontalLabel( g, value, label );
                        g.translate( 0, -labelBounds.y );
                    }
                    else {
                        int offset = 0;
                        if (!BasicGraphicsUtils.isLeftToRight(slider)) {
                            offset = labelBounds.width -
                                label.getPreferredSize().width;
                        }
                        g.translate( labelBounds.x + offset, 0 );
                        paintVerticalLabel( g, value, label );
                        g.translate( -labelBounds.x - offset, 0 );
                    }
                }
            }
        }

    }

    
Called for every label in the label table.  Used to draw the labels for horizontal sliders.
The graphics have been translated to labelRect.y already.
See Also:
setLabelTable.setLabelTable/**
     * Called for every label in the label table.  Used to draw the labels for horizontal sliders.
     * The graphics have been translated to labelRect.y already.
     * @see JSlider#setLabelTable
     */
    protected void paintHorizontalLabel( Graphics g, int value, Component label ) {
        int labelCenter = xPositionForValue( value );
        int labelLeft = labelCenter - (label.getPreferredSize().width / 2);
        g.translate( labelLeft, 0 );
        label.paint( g );
        g.translate( -labelLeft, 0 );
    }

    
Called for every label in the label table.  Used to draw the labels for vertical sliders.
The graphics have been translated to labelRect.x already.
See Also:
setLabelTable.setLabelTable/**
     * Called for every label in the label table.  Used to draw the labels for vertical sliders.
     * The graphics have been translated to labelRect.x already.
     * @see JSlider#setLabelTable
     */
    protected void paintVerticalLabel( Graphics g, int value, Component label ) {
        int labelCenter = yPositionForValue( value );
        int labelTop = labelCenter - (label.getPreferredSize().height / 2);
        g.translate( 0, labelTop );
        label.paint( g );
        g.translate( 0, -labelTop );
    }

    public void paintThumb(Graphics g)  {
        Rectangle knobBounds = thumbRect;
        int w = knobBounds.width;
        int h = knobBounds.height;

        g.translate(knobBounds.x, knobBounds.y);

        if ( slider.isEnabled() ) {
            g.setColor(slider.getBackground());
        }
        else {
            g.setColor(slider.getBackground().darker());
        }

        Boolean paintThumbArrowShape =
            (Boolean)slider.getClientProperty("Slider.paintThumbArrowShape");

        if ((!slider.getPaintTicks() && paintThumbArrowShape == null) ||
            paintThumbArrowShape == Boolean.FALSE) {

            // "plain" version
            g.fillRect(0, 0, w, h);

            g.setColor(Color.black);
            g.drawLine(0, h-1, w-1, h-1);
            g.drawLine(w-1, 0, w-1, h-1);

            g.setColor(highlightColor);
            g.drawLine(0, 0, 0, h-2);
            g.drawLine(1, 0, w-2, 0);

            g.setColor(shadowColor);
            g.drawLine(1, h-2, w-2, h-2);
            g.drawLine(w-2, 1, w-2, h-3);
        }
        else if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            int cw = w / 2;
            g.fillRect(1, 1, w-3, h-1-cw);
            Polygon p = new Polygon();
            p.addPoint(1, h-cw);
            p.addPoint(cw-1, h-1);
            p.addPoint(w-2, h-1-cw);
            g.fillPolygon(p);

            g.setColor(highlightColor);
            g.drawLine(0, 0, w-2, 0);
            g.drawLine(0, 1, 0, h-1-cw);
            g.drawLine(0, h-cw, cw-1, h-1);

            g.setColor(Color.black);
            g.drawLine(w-1, 0, w-1, h-2-cw);
            g.drawLine(w-1, h-1-cw, w-1-cw, h-1);

            g.setColor(shadowColor);
            g.drawLine(w-2, 1, w-2, h-2-cw);
            g.drawLine(w-2, h-1-cw, w-1-cw, h-2);
        }
        else {  // vertical
            int cw = h / 2;
            if(BasicGraphicsUtils.isLeftToRight(slider)) {
                  g.fillRect(1, 1, w-1-cw, h-3);
                  Polygon p = new Polygon();
                  p.addPoint(w-cw-1, 0);
                  p.addPoint(w-1, cw);
                  p.addPoint(w-1-cw, h-2);
                  g.fillPolygon(p);

                  g.setColor(highlightColor);
                  g.drawLine(0, 0, 0, h - 2);                  // left
                  g.drawLine(1, 0, w-1-cw, 0);                 // top
                  g.drawLine(w-cw-1, 0, w-1, cw);              // top slant

                  g.setColor(Color.black);
                  g.drawLine(0, h-1, w-2-cw, h-1);             // bottom
                  g.drawLine(w-1-cw, h-1, w-1, h-1-cw);        // bottom slant

                  g.setColor(shadowColor);
                  g.drawLine(1, h-2, w-2-cw,  h-2 );         // bottom
                  g.drawLine(w-1-cw, h-2, w-2, h-cw-1 );     // bottom slant
            }
            else {
                  g.fillRect(5, 1, w-1-cw, h-3);
                  Polygon p = new Polygon();
                  p.addPoint(cw, 0);
                  p.addPoint(0, cw);
                  p.addPoint(cw, h-2);
                  g.fillPolygon(p);

                  g.setColor(highlightColor);
                  g.drawLine(cw-1, 0, w-2, 0);             // top
                  g.drawLine(0, cw, cw, 0);                // top slant

                  g.setColor(Color.black);
                  g.drawLine(0, h-1-cw, cw, h-1 );         // bottom slant
                  g.drawLine(cw, h-1, w-1, h-1);           // bottom

                  g.setColor(shadowColor);
                  g.drawLine(cw, h-2, w-2,  h-2 );         // bottom
                  g.drawLine(w-1, 1, w-1,  h-2 );          // right
            }
        }

        g.translate(-knobBounds.x, -knobBounds.y);
    }

    // Used exclusively by setThumbLocation()
    private static Rectangle unionRect = new Rectangle();

    public void setThumbLocation(int x, int y)  {
        unionRect.setBounds( thumbRect );

        thumbRect.setLocation( x, y );

        SwingUtilities.computeUnion( thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height, unionRect );
        slider.repaint( unionRect.x, unionRect.y, unionRect.width, unionRect.height );
    }

    public void scrollByBlock(int direction)    {
        synchronized(slider)    {
            int blockIncrement =
                (slider.getMaximum() - slider.getMinimum()) / 10;
            if (blockIncrement == 0) {
                blockIncrement = 1;
            }

            if (slider.getSnapToTicks()) {
                int tickSpacing = getTickSpacing();

                if (blockIncrement < tickSpacing) {
                    blockIncrement = tickSpacing;
                }
            }

            int delta = blockIncrement * ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);
            slider.setValue(slider.getValue() + delta);
        }
    }

    public void scrollByUnit(int direction) {
        synchronized(slider)    {
            int delta = ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);

            if (slider.getSnapToTicks()) {
                delta *= getTickSpacing();
            }

            slider.setValue(slider.getValue() + delta);
        }
    }

    
This function is called when a mousePressed was detected in the track, not
in the thumb.  The default behavior is to scroll by block.  You can
 override this method to stop it from scrolling or to add additional behavior.
/**
     * This function is called when a mousePressed was detected in the track, not
     * in the thumb.  The default behavior is to scroll by block.  You can
     *  override this method to stop it from scrolling or to add additional behavior.
     */
    protected void scrollDueToClickInTrack( int dir ) {
        scrollByBlock( dir );
    }

    protected int xPositionForValue( int value )    {
        int min = slider.getMinimum();
        int max = slider.getMaximum();
        int trackLength = trackRect.width;
        double valueRange = (double)max - (double)min;
        double pixelsPerValue = (double)trackLength / valueRange;
        int trackLeft = trackRect.x;
        int trackRight = trackRect.x + (trackRect.width - 1);
        int xPosition;

        if ( !drawInverted() ) {
            xPosition = trackLeft;
            xPosition += Math.round( pixelsPerValue * ((double)value - min) );
        }
        else {
            xPosition = trackRight;
            xPosition -= Math.round( pixelsPerValue * ((double)value - min) );
        }

        xPosition = Math.max( trackLeft, xPosition );
        xPosition = Math.min( trackRight, xPosition );

        return xPosition;
    }

    protected int yPositionForValue( int value )  {
        return yPositionForValue(value, trackRect.y, trackRect.height);
    }

    
Returns the y location for the specified value.  No checking is
done on the arguments.  In particular if trackHeight is
negative undefined results may occur.
Params:
value – the slider value to get the location for
trackY – y-origin of the track
trackHeight – the height of the track
Since:
1.6/**
     * Returns the y location for the specified value.  No checking is
     * done on the arguments.  In particular if <code>trackHeight</code> is
     * negative undefined results may occur.
     *
     * @param value the slider value to get the location for
     * @param trackY y-origin of the track
     * @param trackHeight the height of the track
     * @since 1.6
     */
    protected int yPositionForValue(int value, int trackY, int trackHeight) {
        int min = slider.getMinimum();
        int max = slider.getMaximum();
        double valueRange = (double)max - (double)min;
        double pixelsPerValue = (double)trackHeight / valueRange;
        int trackBottom = trackY + (trackHeight - 1);
        int yPosition;

        if ( !drawInverted() ) {
            yPosition = trackY;
            yPosition += Math.round( pixelsPerValue * ((double)max - value ) );
        }
        else {
            yPosition = trackY;
            yPosition += Math.round( pixelsPerValue * ((double)value - min) );
        }

        yPosition = Math.max( trackY, yPosition );
        yPosition = Math.min( trackBottom, yPosition );

        return yPosition;
    }

    
Returns the value at the y position. If yPos is beyond the track at the the bottom or the top, this method sets the value to either the minimum or maximum value of the slider, depending on if the slider is inverted or not. /**
     * Returns the value at the y position. If {@code yPos} is beyond the
     * track at the the bottom or the top, this method sets the value to either
     * the minimum or maximum value of the slider, depending on if the slider
     * is inverted or not.
     */
    public int valueForYPosition( int yPos ) {
        int value;
        final int minValue = slider.getMinimum();
        final int maxValue = slider.getMaximum();
        final int trackLength = trackRect.height;
        final int trackTop = trackRect.y;
        final int trackBottom = trackRect.y + (trackRect.height - 1);

        if ( yPos <= trackTop ) {
            value = drawInverted() ? minValue : maxValue;
        }
        else if ( yPos >= trackBottom ) {
            value = drawInverted() ? maxValue : minValue;
        }
        else {
            int distanceFromTrackTop = yPos - trackTop;
            double valueRange = (double)maxValue - (double)minValue;
            double valuePerPixel = valueRange / (double)trackLength;
            int valueFromTrackTop = (int)Math.round( distanceFromTrackTop * valuePerPixel );

            value = drawInverted() ? minValue + valueFromTrackTop : maxValue - valueFromTrackTop;
        }

        return value;
    }

    
Returns the value at the x position. If xPos is beyond the track at the left or the right, this method sets the value to either the minimum or maximum value of the slider, depending on if the slider is inverted or not. /**
     * Returns the value at the x position.  If {@code xPos} is beyond the
     * track at the left or the right, this method sets the value to either the
     * minimum or maximum value of the slider, depending on if the slider is
     * inverted or not.
     */
    public int valueForXPosition( int xPos ) {
        int value;
        final int minValue = slider.getMinimum();
        final int maxValue = slider.getMaximum();
        final int trackLength = trackRect.width;
        final int trackLeft = trackRect.x;
        final int trackRight = trackRect.x + (trackRect.width - 1);

        if ( xPos <= trackLeft ) {
            value = drawInverted() ? maxValue : minValue;
        }
        else if ( xPos >= trackRight ) {
            value = drawInverted() ? minValue : maxValue;
        }
        else {
            int distanceFromTrackLeft = xPos - trackLeft;
            double valueRange = (double)maxValue - (double)minValue;
            double valuePerPixel = valueRange / (double)trackLength;
            int valueFromTrackLeft = (int)Math.round( distanceFromTrackLeft * valuePerPixel );

            value = drawInverted() ? maxValue - valueFromTrackLeft :
              minValue + valueFromTrackLeft;
        }

        return value;
    }


    private class Handler implements ChangeListener,
            ComponentListener, FocusListener, PropertyChangeListener {
        // Change Handler
        public void stateChanged(ChangeEvent e) {
            if (!isDragging) {
                calculateThumbLocation();
                slider.repaint();
            }
            lastValue = slider.getValue();
        }

        // Component Handler
        public void componentHidden(ComponentEvent e) { }
        public void componentMoved(ComponentEvent e) { }
        public void componentResized(ComponentEvent e) {
            calculateGeometry();
            slider.repaint();
        }
        public void componentShown(ComponentEvent e) { }

        // Focus Handler
        public void focusGained(FocusEvent e) { slider.repaint(); }
        public void focusLost(FocusEvent e) { slider.repaint(); }

        // Property Change Handler
        public void propertyChange(PropertyChangeEvent e) {
            String propertyName = e.getPropertyName();
            if (propertyName == "orientation" ||
                    propertyName == "inverted" ||
                    propertyName == "labelTable" ||
                    propertyName == "majorTickSpacing" ||
                    propertyName == "minorTickSpacing" ||
                    propertyName == "paintTicks" ||
                    propertyName == "paintTrack" ||
                    propertyName == "font" ||
                    propertyName == "paintLabels" ||
                    propertyName == "Slider.paintThumbArrowShape") {
                checkedLabelBaselines = false;
                calculateGeometry();
                slider.repaint();
            } else if (propertyName == "componentOrientation") {
                calculateGeometry();
                slider.repaint();
                InputMap km = getInputMap(JComponent.WHEN_FOCUSED, slider);
                SwingUtilities.replaceUIInputMap(slider,
                    JComponent.WHEN_FOCUSED, km);
            } else if (propertyName == "model") {
                ((BoundedRangeModel)e.getOldValue()).removeChangeListener(
                    changeListener);
                ((BoundedRangeModel)e.getNewValue()).addChangeListener(
                    changeListener);
                calculateThumbLocation();
                slider.repaint();
            }
        }
    }

    /////////////////////////////////////////////////////////////////////////
    /// Model Listener Class
    /////////////////////////////////////////////////////////////////////////
    
Data model listener.
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * Data model listener.
     *
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class ChangeHandler implements ChangeListener {
        // NOTE: This class exists only for backward compatibility. All
        // its functionality has been moved into Handler. If you need to add
        // new functionality add it to the Handler, but make sure this
        // class calls into the Handler.
        public void stateChanged(ChangeEvent e) {
            getHandler().stateChanged(e);
        }
    }

    /////////////////////////////////////////////////////////////////////////
    /// Track Listener Class
    /////////////////////////////////////////////////////////////////////////
    
Track mouse movements.
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * Track mouse movements.
     *
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class TrackListener extends MouseInputAdapter {
        protected transient int offset;
        protected transient int currentMouseX, currentMouseY;

        public void mouseReleased(MouseEvent e) {
            if (!slider.isEnabled()) {
                return;
            }

            offset = 0;
            scrollTimer.stop();

            isDragging = false;
            slider.setValueIsAdjusting(false);
            slider.repaint();
        }

        
If the mouse is pressed above the "thumb" component
then reduce the scrollbars value by one page ("page up"),
otherwise increase it by one page.  If there is no
thumb then page up if the mouse is in the upper half
of the track.
/**
        * If the mouse is pressed above the "thumb" component
        * then reduce the scrollbars value by one page ("page up"),
        * otherwise increase it by one page.  If there is no
        * thumb then page up if the mouse is in the upper half
        * of the track.
        */
        public void mousePressed(MouseEvent e) {
            if (!slider.isEnabled()) {
                return;
            }

            // We should recalculate geometry just before
            // calculation of the thumb movement direction.
            // It is important for the case, when JSlider
            // is a cell editor in JTable. See 6348946.
            calculateGeometry();

            currentMouseX = e.getX();
            currentMouseY = e.getY();

            if (slider.isRequestFocusEnabled()) {
                slider.requestFocus();
            }

            // Clicked in the Thumb area?
            if (thumbRect.contains(currentMouseX, currentMouseY)) {
                if (UIManager.getBoolean("Slider.onlyLeftMouseButtonDrag")
                        && !SwingUtilities.isLeftMouseButton(e)) {
                    return;
                }

                switch (slider.getOrientation()) {
                case JSlider.VERTICAL:
                    offset = currentMouseY - thumbRect.y;
                    break;
                case JSlider.HORIZONTAL:
                    offset = currentMouseX - thumbRect.x;
                    break;
                }
                isDragging = true;
                return;
            }

            if (!SwingUtilities.isLeftMouseButton(e)) {
                return;
            }

            isDragging = false;
            slider.setValueIsAdjusting(true);

            Dimension sbSize = slider.getSize();
            int direction = POSITIVE_SCROLL;

            switch (slider.getOrientation()) {
            case JSlider.VERTICAL:
                if ( thumbRect.isEmpty() ) {
                    int scrollbarCenter = sbSize.height / 2;
                    if ( !drawInverted() ) {
                        direction = (currentMouseY < scrollbarCenter) ?
                            POSITIVE_SCROLL : NEGATIVE_SCROLL;
                    }
                    else {
                        direction = (currentMouseY < scrollbarCenter) ?
                            NEGATIVE_SCROLL : POSITIVE_SCROLL;
                    }
                }
                else {
                    int thumbY = thumbRect.y;
                    if ( !drawInverted() ) {
                        direction = (currentMouseY < thumbY) ?
                            POSITIVE_SCROLL : NEGATIVE_SCROLL;
                    }
                    else {
                        direction = (currentMouseY < thumbY) ?
                            NEGATIVE_SCROLL : POSITIVE_SCROLL;
                    }
                }
                break;
            case JSlider.HORIZONTAL:
                if ( thumbRect.isEmpty() ) {
                    int scrollbarCenter = sbSize.width / 2;
                    if ( !drawInverted() ) {
                        direction = (currentMouseX < scrollbarCenter) ?
                            NEGATIVE_SCROLL : POSITIVE_SCROLL;
                    }
                    else {
                        direction = (currentMouseX < scrollbarCenter) ?
                            POSITIVE_SCROLL : NEGATIVE_SCROLL;
                    }
                }
                else {
                    int thumbX = thumbRect.x;
                    if ( !drawInverted() ) {
                        direction = (currentMouseX < thumbX) ?
                            NEGATIVE_SCROLL : POSITIVE_SCROLL;
                    }
                    else {
                        direction = (currentMouseX < thumbX) ?
                            POSITIVE_SCROLL : NEGATIVE_SCROLL;
                    }
                }
                break;
            }

            if (shouldScroll(direction)) {
                scrollDueToClickInTrack(direction);
            }
            if (shouldScroll(direction)) {
                scrollTimer.stop();
                scrollListener.setDirection(direction);
                scrollTimer.start();
            }
        }

        public boolean shouldScroll(int direction) {
            Rectangle r = thumbRect;
            if (slider.getOrientation() == JSlider.VERTICAL) {
                if (drawInverted() ? direction < 0 : direction > 0) {
                    if (r.y  <= currentMouseY) {
                        return false;
                    }
                }
                else if (r.y + r.height >= currentMouseY) {
                    return false;
                }
            }
            else {
                if (drawInverted() ? direction < 0 : direction > 0) {
                    if (r.x + r.width  >= currentMouseX) {
                        return false;
                    }
                }
                else if (r.x <= currentMouseX) {
                    return false;
                }
            }

            if (direction > 0 && slider.getValue() + slider.getExtent() >=
                    slider.getMaximum()) {
                return false;
            }
            else if (direction < 0 && slider.getValue() <=
                    slider.getMinimum()) {
                return false;
            }

            return true;
        }

        
Set the models value to the position of the top/left
of the thumb relative to the origin of the track.
/**
        * Set the models value to the position of the top/left
        * of the thumb relative to the origin of the track.
        */
        public void mouseDragged(MouseEvent e) {
            int thumbMiddle;

            if (!slider.isEnabled()) {
                return;
            }

            currentMouseX = e.getX();
            currentMouseY = e.getY();

            if (!isDragging) {
                return;
            }

            slider.setValueIsAdjusting(true);

            switch (slider.getOrientation()) {
            case JSlider.VERTICAL:
                int halfThumbHeight = thumbRect.height / 2;
                int thumbTop = e.getY() - offset;
                int trackTop = trackRect.y;
                int trackBottom = trackRect.y + (trackRect.height - 1);
                int vMax = yPositionForValue(slider.getMaximum() -
                                            slider.getExtent());

                if (drawInverted()) {
                    trackBottom = vMax;
                }
                else {
                    trackTop = vMax;
                }
                thumbTop = Math.max(thumbTop, trackTop - halfThumbHeight);
                thumbTop = Math.min(thumbTop, trackBottom - halfThumbHeight);

                setThumbLocation(thumbRect.x, thumbTop);

                thumbMiddle = thumbTop + halfThumbHeight;
                slider.setValue( valueForYPosition( thumbMiddle ) );
                break;
            case JSlider.HORIZONTAL:
                int halfThumbWidth = thumbRect.width / 2;
                int thumbLeft = e.getX() - offset;
                int trackLeft = trackRect.x;
                int trackRight = trackRect.x + (trackRect.width - 1);
                int hMax = xPositionForValue(slider.getMaximum() -
                                            slider.getExtent());

                if (drawInverted()) {
                    trackLeft = hMax;
                }
                else {
                    trackRight = hMax;
                }
                thumbLeft = Math.max(thumbLeft, trackLeft - halfThumbWidth);
                thumbLeft = Math.min(thumbLeft, trackRight - halfThumbWidth);

                setThumbLocation(thumbLeft, thumbRect.y);

                thumbMiddle = thumbLeft + halfThumbWidth;
                slider.setValue(valueForXPosition(thumbMiddle));
                break;
            }
        }

        public void mouseMoved(MouseEvent e) { }
    }

    
Scroll-event listener.
This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * Scroll-event listener.
     *
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class ScrollListener implements ActionListener {
        // changed this class to public to avoid bogus IllegalAccessException
        // bug in InternetExplorer browser.  It was protected.  Work around
        // for 4109432
        int direction = POSITIVE_SCROLL;
        boolean useBlockIncrement;

        public ScrollListener() {
            direction = POSITIVE_SCROLL;
            useBlockIncrement = true;
        }

        public ScrollListener(int dir, boolean block)   {
            direction = dir;
            useBlockIncrement = block;
        }

        public void setDirection(int direction) {
            this.direction = direction;
        }

        public void setScrollByBlock(boolean block) {
            this.useBlockIncrement = block;
        }

        public void actionPerformed(ActionEvent e) {
            if (useBlockIncrement) {
                scrollByBlock(direction);
            }
            else {
                scrollByUnit(direction);
            }
            if (!trackListener.shouldScroll(direction)) {
                ((Timer)e.getSource()).stop();
            }
        }
    }

    
Listener for resizing events.

This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * Listener for resizing events.
     * <p>
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class ComponentHandler extends ComponentAdapter {
        // NOTE: This class exists only for backward compatibility. All
        // its functionality has been moved into Handler. If you need to add
        // new functionality add it to the Handler, but make sure this
        // class calls into the Handler.
        public void componentResized(ComponentEvent e)  {
            getHandler().componentResized(e);
        }
    }

    
Focus-change listener.

This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * Focus-change listener.
     * <p>
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class FocusHandler implements FocusListener {
        // NOTE: This class exists only for backward compatibility. All
        // its functionality has been moved into Handler. If you need to add
        // new functionality add it to the Handler, but make sure this
        // class calls into the Handler.
        public void focusGained(FocusEvent e) {
            getHandler().focusGained(e);
        }

        public void focusLost(FocusEvent e) {
            getHandler().focusLost(e);
        }
    }

    
As of Java 2 platform v1.3 this undocumented class is no longer used.
The recommended approach to creating bindings is to use a
combination of an ActionMap, to contain the action,
and an InputMap to contain the mapping from KeyStroke
to action description. The InputMap is is usually described in the
LookAndFeel tables.

Please refer to the key bindings specification for further details.

This class should be treated as a "protected" inner class.
Instantiate it only within subclasses of Foo.
/**
     * As of Java 2 platform v1.3 this undocumented class is no longer used.
     * The recommended approach to creating bindings is to use a
     * combination of an <code>ActionMap</code>, to contain the action,
     * and an <code>InputMap</code> to contain the mapping from KeyStroke
     * to action description. The InputMap is is usually described in the
     * LookAndFeel tables.
     * <p>
     * Please refer to the key bindings specification for further details.
     * <p>
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of <code>Foo</code>.
     */
    public class ActionScroller extends AbstractAction {
        // NOTE: This class exists only for backward compatibility. All
        // its functionality has been moved into Actions. If you need to add
        // new functionality add it to the Actions, but make sure this
        // class calls into the Actions.
        int dir;
        boolean block;
        JSlider slider;

        public ActionScroller( JSlider slider, int dir, boolean block) {
            this.dir = dir;
            this.block = block;
            this.slider = slider;
        }

        public void actionPerformed(ActionEvent e) {
            SHARED_ACTION.scroll(slider, BasicSliderUI.this, dir, block);
        }

        public boolean isEnabled() {
            boolean b = true;
            if (slider != null) {
                b = slider.isEnabled();
            }
            return b;
        }

    }


    
A static version of the above.
/**
     * A static version of the above.
     */
    static class SharedActionScroller extends AbstractAction {
        // NOTE: This class exists only for backward compatibility. All
        // its functionality has been moved into Actions. If you need to add
        // new functionality add it to the Actions, but make sure this
        // class calls into the Actions.
        int dir;
        boolean block;

        public SharedActionScroller(int dir, boolean block) {
            this.dir = dir;
            this.block = block;
        }

        public void actionPerformed(ActionEvent evt) {
            JSlider slider = (JSlider)evt.getSource();
            BasicSliderUI ui = (BasicSliderUI)BasicLookAndFeel.getUIOfType(
                    slider.getUI(), BasicSliderUI.class);
            if (ui == null) {
                return;
            }
            SHARED_ACTION.scroll(slider, ui, dir, block);
        }
    }

    private static class Actions extends UIAction {
        public static final String POSITIVE_UNIT_INCREMENT =
            "positiveUnitIncrement";
        public static final String POSITIVE_BLOCK_INCREMENT =
            "positiveBlockIncrement";
        public static final String NEGATIVE_UNIT_INCREMENT =
            "negativeUnitIncrement";
        public static final String NEGATIVE_BLOCK_INCREMENT =
            "negativeBlockIncrement";
        public static final String MIN_SCROLL_INCREMENT = "minScroll";
        public static final String MAX_SCROLL_INCREMENT = "maxScroll";


        Actions() {
            super(null);
        }

        public Actions(String name) {
            super(name);
        }

        public void actionPerformed(ActionEvent evt) {
            JSlider slider = (JSlider)evt.getSource();
            BasicSliderUI ui = (BasicSliderUI)BasicLookAndFeel.getUIOfType(
                     slider.getUI(), BasicSliderUI.class);
            String name = getName();

            if (ui == null) {
                return;
            }
            if (POSITIVE_UNIT_INCREMENT == name) {
                scroll(slider, ui, POSITIVE_SCROLL, false);
            } else if (NEGATIVE_UNIT_INCREMENT == name) {
                scroll(slider, ui, NEGATIVE_SCROLL, false);
            } else if (POSITIVE_BLOCK_INCREMENT == name) {
                scroll(slider, ui, POSITIVE_SCROLL, true);
            } else if (NEGATIVE_BLOCK_INCREMENT == name) {
                scroll(slider, ui, NEGATIVE_SCROLL, true);
            } else if (MIN_SCROLL_INCREMENT == name) {
                scroll(slider, ui, MIN_SCROLL, false);
            } else if (MAX_SCROLL_INCREMENT == name) {
                scroll(slider, ui, MAX_SCROLL, false);
            }
        }

        private void scroll(JSlider slider, BasicSliderUI ui, int direction,
                boolean isBlock) {
            boolean invert = slider.getInverted();

            if (direction == NEGATIVE_SCROLL || direction == POSITIVE_SCROLL) {
                if (invert) {
                    direction = (direction == POSITIVE_SCROLL) ?
                        NEGATIVE_SCROLL : POSITIVE_SCROLL;
                }

                if (isBlock) {
                    ui.scrollByBlock(direction);
                } else {
                    ui.scrollByUnit(direction);
                }
            } else {  // MIN or MAX
                if (invert) {
                    direction = (direction == MIN_SCROLL) ?
                        MAX_SCROLL : MIN_SCROLL;
                }

                slider.setValue((direction == MIN_SCROLL) ?
                    slider.getMinimum() : slider.getMaximum());
            }
        }
    }
}