/*
 * @(#)BasicSliderUI.java	1.75 01/11/29
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.swing.plaf.basic;

import java.awt.Component;
import java.awt.Container;
import java.awt.Adjustable;
import java.awt.event.*;
import java.awt.Graphics;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Point;
import java.awt.Insets;
import java.awt.Color;
import java.awt.IllegalComponentStateException;
import java.awt.Polygon;
import java.beans.*;
import java.util.*;

import javax.swing.border.AbstractBorder;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;


/**
 * A Basic L&F implementation of SliderUI.
 *
 * @version 1.75 11/29/01
 * @author Tom Santos
 */
public class BasicSliderUI extends SliderUI{
    public final int POSITIVE_SCROLL = +1;
    public final int NEGATIVE_SCROLL = -1;
    public final int MIN_SCROLL = -2;
    public final int MAX_SCROLL = +2;

    protected Timer scrollTimer;
    protected JSlider slider;

    protected Insets focusInsets = null;
    protected Insets insetCache = null;
    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 static final Dimension PREFERRED_HORIZONTAL_SIZE = new Dimension(200, 21);
    private static final Dimension PREFERRED_VERTICAL_SIZE = new Dimension(21, 200);
    private static final Dimension MINIMUM_HORIZONTAL_SIZE = new Dimension(36, 21);
    private static final Dimension MINIMUM_VERTICAL_SIZE = new Dimension(21, 36);

    private transient boolean isDragging;

    protected TrackListener trackListener;
    protected ChangeListener changeListener;
    protected ComponentListener componentListener;
    protected FocusListener focusListener;
    protected ScrollListener scrollListener;
    protected PropertyChangeListener propertyChangeListener;

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


    protected Color getShadowColor() {
        return shadowColor;
    }

    protected Color getHighlightColor() {
        return highlightColor;
    }

    protected Color getFocusColor() {
        return focusColor;
    }

    /////////////////////////////////////////////////////////////////////////////
    // 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;

        slider.setEnabled(slider.isEnabled());
        slider.setOpaque(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();
	focusRect = new Rectangle();
	contentRect = new Rectangle();
	labelRect = new Rectangle();
	tickRect = new Rectangle();
	trackRect = new Rectangle();
	thumbRect = new Rectangle();

	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 + ".");

        LookAndFeel.uninstallBorder(slider);

        scrollTimer.stop();
        scrollTimer = null;

	uninstallListeners( slider );
	uninstallKeyboardActions(slider);

	focusInsets = null;
	insetCache = null;
	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.installColors(slider, "Slider.background", "Slider.foreground");
        highlightColor = UIManager.getColor("Slider.highlight");

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

	focusInsets = (Insets)UIManager.get( "Slider.focusInsets" );
    }

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

    protected ChangeListener createChangeListener( JSlider slider ) {
        return new ChangeHandler();
    }

    protected ComponentListener createComponentListener( JSlider slider ) {
        return new ComponentHandler();
    }

    protected FocusListener createFocusListener( JSlider slider ) {
        return new FocusHandler();
    }

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

    protected PropertyChangeListener createPropertyChangeListener( JSlider slider ) {
        return new PropertyChangeHandler();
    }

    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);
    }

    protected void installKeyboardActions( JSlider slider ) {
        slider.registerKeyboardAction(new ActionScroller(slider, POSITIVE_SCROLL, false),
                                      KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT,0), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, POSITIVE_SCROLL, false),
                                      KeyStroke.getKeyStroke("KP_RIGHT"), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, NEGATIVE_SCROLL, false),
                                      KeyStroke.getKeyStroke(KeyEvent.VK_DOWN,0), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, NEGATIVE_SCROLL, false),
                                      KeyStroke.getKeyStroke("KP_DOWN"), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, NEGATIVE_SCROLL, true),
                                      KeyStroke.getKeyStroke(KeyEvent.VK_PAGE_DOWN,0), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, NEGATIVE_SCROLL, false),
                                      KeyStroke.getKeyStroke(KeyEvent.VK_LEFT,0), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, NEGATIVE_SCROLL, false),
                                      KeyStroke.getKeyStroke("KP_LEFT"), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, POSITIVE_SCROLL, false),
                                      KeyStroke.getKeyStroke(KeyEvent.VK_UP,0), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, POSITIVE_SCROLL, false),
                                      KeyStroke.getKeyStroke("KP_UP"), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, POSITIVE_SCROLL, true),
                                      KeyStroke.getKeyStroke(KeyEvent.VK_PAGE_UP,0), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, MIN_SCROLL, true),
                                      KeyStroke.getKeyStroke(KeyEvent.VK_HOME,0), 
                                      JComponent.WHEN_FOCUSED);

        slider.registerKeyboardAction(new ActionScroller(slider, MAX_SCROLL, true),
                                      KeyStroke.getKeyStroke(KeyEvent.VK_END,0), 
                                      JComponent.WHEN_FOCUSED);
    }

    protected void uninstallKeyboardActions( JSlider slider ) {
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( KeyEvent.VK_RIGHT, 0 ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( "KP_RIGHT" ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( KeyEvent.VK_DOWN, 0 ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( "KP_DOWN" ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( KeyEvent.VK_PAGE_DOWN, 0 ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( KeyEvent.VK_LEFT, 0 ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( "KP_LEFT" ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( KeyEvent.VK_UP, 0 ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( "KP_UP" ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( KeyEvent.VK_PAGE_UP, 0 ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( KeyEvent.VK_HOME, 0 ) );
        slider.unregisterKeyboardAction( KeyStroke.getKeyStroke( KeyEvent.VK_END, 0 ) );
    }

    public Dimension getPreferredHorizontalSize() {
        return PREFERRED_HORIZONTAL_SIZE;
    }

    public Dimension getPreferredVerticalSize() {
        return PREFERRED_VERTICAL_SIZE;
    }

    public Dimension getMinimumHorizontalSize() {
        return MINIMUM_HORIZONTAL_SIZE;
    }

    public Dimension getMinimumVerticalSize() {
        return MINIMUM_VERTICAL_SIZE;
    }

    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);
    }

    protected void calculateThumbLocation() {
        if ( slider.getSnapToTicks() ) {
	    int sliderValue = slider.getValue();
	    int snappedValue = sliderValue; 
	    int majorTickSpacing = slider.getMajorTickSpacing();
	    int minorTickSpacing = slider.getMinorTickSpacing();
	    int tickSpacing = 0;
	    
	    if ( minorTickSpacing > 0 ) {
	        tickSpacing = minorTickSpacing;
	    }
	    else if ( majorTickSpacing > 0 ) {
	        tickSpacing = majorTickSpacing;
	    }

	    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 );
		    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() {
        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
	    trackRect.x = contentRect.x + trackBuffer;
	    trackRect.y = contentRect.y;
	    trackRect.width = contentRect.width - (trackBuffer * 2);
	    trackRect.height = thumbRect.height;
	}
	else {
	    trackRect.x = contentRect.x;
	    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().
     */
    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 = getTickLength();
	    
	    if ( !slider.getPaintTicks() ) {
	        --tickRect.y;
		tickRect.height = 0;
	    }
	}
	else {
	    tickRect.x = trackRect.x + trackRect.width;
	    tickRect.y = trackRect.y;
	    tickRect.width = getTickLength();
	    tickRect.height = trackRect.height;

	    if ( !slider.getPaintTicks() ) {
	        --tickRect.x;
		tickRect.width = 0;
	    }
	}
    }

    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 {
	        labelRect.x = tickRect.x + tickRect.width;
		labelRect.y = tickRect.y - trackBuffer;
                labelRect.width = getWidthOfWidestLabel();
		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 {
	        labelRect.x = tickRect.x + tickRect.width;
		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 {
        public void propertyChange( PropertyChangeEvent e ) {
	    String propertyName = e.getPropertyName();
             if (propertyName.equals( "orientation" ) ||
                 propertyName.equals( "inverted" ) ||
		 propertyName.equals( "labelTable" )  ||
		 propertyName.equals( "majorTickSpacing" )  ||
		 propertyName.equals( "minorTickSpacing" )  ||
		 propertyName.equals( "paintTicks" )  ||
		 propertyName.equals( "paintTrack" )  ||
		 propertyName.equals( "paintLabels" ) ) {
	      
	        calculateGeometry();
	    }
	    else if ( propertyName.equals( "model" ) ) {
	        ((BoundedRangeModel)e.getOldValue()).removeChangeListener( changeListener );
		((BoundedRangeModel)e.getNewValue()).addChangeListener( changeListener );
	        calculateThumbLocation();
		slider.repaint();
	    }
	}
    }

    protected int getWidthOfWidestLabel() {
        Dictionary dictionary = slider.getLabelTable();
        int widest = 0;
        if ( dictionary != null ) {
            Enumeration keys = dictionary.keys();
            while ( keys.hasMoreElements() ) {
                Component label = (Component)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() ) {
                Component label = (Component)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;
    }

    /**
     * Returns the label that corresponds to the highest slider value in the label table.
     * @see JSlider#setLabelTable
     */
    protected Component getLowestValueLabel() {
        Dictionary dictionary = slider.getLabelTable();
        Component label = null;

        if ( dictionary != null ) {
            Enumeration keys = dictionary.keys();
            if ( keys.hasMoreElements() ) {
                int lowestValue = ((Integer)keys.nextElement()).intValue();

                while ( keys.hasMoreElements() ) {
                    int value = ((Integer)keys.nextElement()).intValue();
                    lowestValue = Math.min( value, lowestValue );
                }

                label = (Component)dictionary.get( new Integer( lowestValue ) );
            }
        }

        return label;
    }

    /**
     * Returns the label that corresponds to the lowest slider value in the label table.
     * @see JSlider#setLabelTable
     */
    protected Component getHighestValueLabel() {
        Dictionary dictionary = slider.getLabelTable();
        Component label = null;

        if ( dictionary != null ) {
            Enumeration keys = dictionary.keys();
            if ( keys.hasMoreElements() ) {
                int highestValue = ((Integer)keys.nextElement()).intValue();

                while ( keys.hasMoreElements() ) {
                    int value = ((Integer)keys.nextElement()).intValue();
                    highestValue = Math.max( value, highestValue );
                }

                label = (Component)dictionary.get( new Integer( highestValue ) );
            }
        }

        return label;
    }

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

	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();
	}
    }

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

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

    public void paintTrack(Graphics g)  {        
        int cx, cy, cw, ch;
        int pad;

        Rectangle trackBounds = trackRect;

        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            pad = trackBuffer;
            cx = pad;
            cy = (trackBounds.height / 2) - 2;
            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 {
            pad = trackBuffer;
            cx = (trackBounds.width / 2) - 2;
            cy = pad;
            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;
        int i;
        int maj, min, max;
        int w = tickBounds.width;
        int h = tickBounds.height;
        int centerEffect, tickHeight;

        g.setColor(slider.getBackground());
        g.fillRect(tickBounds.x, tickBounds.y, tickBounds.width, tickBounds.height);  
        g.setColor(Color.black);

        maj = slider.getMajorTickSpacing();
        min = slider.getMinorTickSpacing();

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

            int value = slider.getMinimum();
            int xPos = 0;

            if ( slider.getMinorTickSpacing() > 0 ) {
                while ( value <= slider.getMaximum() ) {
                    xPos = xPositionForValue( value );
                    paintMinorTickForHorizSlider( g, tickBounds, xPos );
                    value += slider.getMinorTickSpacing();
                }
            }

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

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

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

            int value = slider.getMinimum();
            int yPos = 0;

            if ( slider.getMinorTickSpacing() > 0 ) {
                while ( value <= slider.getMaximum() ) {
                    yPos = yPositionForValue( value );
                    paintMinorTickForVertSlider( g, tickBounds, yPos );
                    value += slider.getMinorTickSpacing();
                }
            }

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

                while ( value <= slider.getMaximum() ) {
                    yPos = yPositionForValue( value );
                    paintMajorTickForVertSlider( g, tickBounds, yPos );
                    value += slider.getMajorTickSpacing();
                }
            }
            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();
            while ( keys.hasMoreElements() ) {
                Integer key = (Integer)keys.nextElement();
                Component label = (Component)dictionary.get( key );

                if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
		    g.translate( 0, labelBounds.y );
                    paintHorizontalLabel( g, key.intValue(), label );
		    g.translate( 0, -labelBounds.y );
                }
                else {
		    g.translate( labelBounds.x, 0 );
                    paintVerticalLabel( g, key.intValue(), label );
		    g.translate( -labelBounds.x, 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 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 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());
        }

        if ( !slider.getPaintTicks() ) {
            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 {
            int cw = h / 2;
            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);
            g.drawLine(1, 0, w-1-cw, 0);
            g.drawLine(w-cw-1, 0, w-1, cw); 

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

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

        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 oldValue = slider.getValue();
            int blockIncrement = slider.getMaximum() / 10;
            int delta = blockIncrement * ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);

            slider.setValue(oldValue + delta);          
        }
    }

    public void scrollByUnit(int direction) {
        synchronized(slider)    {

            int oldValue = slider.getValue();
            int delta = 1 * ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);

            slider.setValue(oldValue + 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.
     */
    protected void scrollDueToClickInTrack( int dir ) {
        scrollByBlock( dir );
    }

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

        if ( !slider.getInverted() ) {
            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 )  {
        int min = slider.getMinimum();
        int max = slider.getMaximum();
        int trackLength = trackRect.height; 
        int valueRange = slider.getMaximum() - slider.getMinimum();
        double pixelsPerValue = (double)trackLength / (double)valueRange;
        int trackTop = trackRect.y;
        int trackBottom = trackRect.y + (trackRect.height - 1);
        int yPosition;

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

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

        return yPosition;
    }

    /**
     * Returns a value give a y position.  If yPos is past the track at the top or the
     * bottom it will set the value to the min or max of the slider, depending 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 = slider.getInverted() ? minValue : maxValue;
	}
	else if ( yPos >= trackBottom ) {
	    value = slider.getInverted() ? maxValue : minValue;
	}
	else {
	    int distanceFromTrackTop = yPos - trackTop;
	    int valueRange = maxValue - minValue;
	    double valuePerPixel = (double)valueRange / (double)trackLength;
	    int valueFromTrackTop = (int)Math.round( distanceFromTrackTop * valuePerPixel );

	    value = slider.getInverted() ? minValue + valueFromTrackTop : maxValue - valueFromTrackTop;
	}
	
	return value;
    }
  
    /**
     * Returns a value give an x position.  If xPos is past the track at the left or the
     * right it will set the value to the min or max of the slider, depending 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 = slider.getInverted() ? maxValue : minValue;
	}
	else if ( xPos >= trackRight ) {
	    value = slider.getInverted() ? minValue : maxValue;
	}
	else {
	    int distanceFromTrackLeft = xPos - trackLeft;
	    int valueRange = maxValue - minValue;
	    double valuePerPixel = (double)valueRange / (double)trackLength;
	    int valueFromTrackLeft = (int)Math.round( distanceFromTrackLeft * valuePerPixel );
	    
	    value = slider.getInverted() ? maxValue - valueFromTrackLeft :
	      minValue + valueFromTrackLeft;
	}
	
	return value;
    }

    /////////////////////////////////////////////////////////////////////////
    /// Model Listener Class
    /////////////////////////////////////////////////////////////////////////        
    /**
     * Data model listener.
     *
     * This inner class is marked "public" due to a compiler bug.
     * This class should be treated as a "protected" inner class.
     * Instantiate it only within subclasses of <Foo>.
     */
    public class ChangeHandler implements ChangeListener {
        public void stateChanged(ChangeEvent e)                {
	    if ( !isDragging ) {
	        calculateThumbLocation();
		slider.repaint();
	    }
        }
    }

    /////////////////////////////////////////////////////////////////////////
    /// Track Listener Class
    /////////////////////////////////////////////////////////////////////////        
    /**
     * Track mouse movements.
     *
     * This inner class is marked "public" due to a compiler bug.
     * This class should be treated as a "protected" inner class.
     * Instantiate it only within subclasses of <Foo>.
     */
    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();

            // This is the way we have to determine snap-to-ticks.  It's hard to explain
            // but since ChangeEvents don't give us any idea what has changed we don't
            // have a way to stop the thumb bounds from being recalculated.  Recalculating
            // the thumb bounds moves the thumb over the current value (i.e., snapping
            // to the ticks).
            if ( slider.getSnapToTicks() /*|| slider.getSnapToValue()*/ ) {
                isDragging = false;
                slider.setValueIsAdjusting(false);
            }
            else {
                slider.setValueIsAdjusting(false);
                isDragging = 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.
        */
        public void mousePressed(MouseEvent e)                {

            if ( !slider.isEnabled() )
                return;

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

            slider.requestFocus();

            // Clicked in the Thumb area?
            if ( thumbRect.contains(currentMouseX, currentMouseY) ) {
                switch ( slider.getOrientation() ) {
                case JSlider.VERTICAL:
                    offset = currentMouseY - thumbRect.y;
                    break;
                case JSlider.HORIZONTAL:
                    offset = currentMouseX - thumbRect.x;
                    break;
                }
                isDragging = true;
                slider.setValueIsAdjusting(true);
                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 ( !slider.getInverted() ) {
                        direction = (currentMouseY < scrollbarCenter) ? POSITIVE_SCROLL : NEGATIVE_SCROLL;
                    }
                    else {
                        direction = (currentMouseY < scrollbarCenter) ? NEGATIVE_SCROLL : POSITIVE_SCROLL;
                    }
                }
                else {
                    int thumbY = thumbRect.y;
                    if ( !slider.getInverted() ) {
                        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 ( !slider.getInverted() ) {
                        direction = (currentMouseX < scrollbarCenter) ? NEGATIVE_SCROLL : POSITIVE_SCROLL;
                    }
                    else {
                        direction = (currentMouseX < scrollbarCenter) ? POSITIVE_SCROLL : NEGATIVE_SCROLL;
                    }
                }
                else {
                    int thumbX = thumbRect.x;
                    if ( !slider.getInverted() ) {
                        direction = (currentMouseX < thumbX) ? NEGATIVE_SCROLL : POSITIVE_SCROLL;
                    }
                    else {
                        direction = (currentMouseX < thumbX) ? POSITIVE_SCROLL : NEGATIVE_SCROLL;
                    }
                }
                break;
            }
            scrollDueToClickInTrack(direction);
            Rectangle r = thumbRect;
            if ( !r.contains(currentMouseX, currentMouseY) ) {
                if ( shouldScroll(direction) ) {
                    scrollTimer.stop();
                    scrollListener.setDirection(direction);
                    scrollTimer.start();
                }
            }
        }

        public boolean shouldScroll(int direction) {
            Rectangle r = thumbRect;
            if ( slider.getOrientation() == JSlider.VERTICAL ) {
                if ( slider.getInverted() ? direction < 0 : direction > 0 ) {
                    if ( r.y + r.height  <= currentMouseY ) {
                        return false;
                    }
                }
                else if ( r.y >= currentMouseY ) {
                    return false;
                }
            }
            else {
                if ( slider.getInverted() ? 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.
        */
        public void mouseDragged( MouseEvent e ) {                    
            BasicScrollBarUI ui;
            int thumbMiddle = 0;

            if ( !slider.isEnabled() )
                return;

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

            if ( !isDragging )
                return;

            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);

                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);

                thumbLeft = Math.max( thumbLeft, trackLeft - halfThumbWidth );
                thumbLeft = Math.min( thumbLeft, trackRight - halfThumbWidth );

                setThumbLocation( thumbLeft, thumbRect.y);

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

        public void mouseMoved(MouseEvent e)    {}     

    }

    /**
     * Scroll-event listener.
     *
     * This inner class is marked "public" due to a compiler bug.
     * This class should be treated as a "protected" inner class.
     * Instantiate it only within subclasses of <Foo>.
     */
    public class ScrollListener implements ActionListener {
        // changed this class to public to avoid bogus IllegalAccessException bug i
        // 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.
     * <p>
     * This inner class is marked "public" due to a compiler bug.
     * This class should be treated as a "protected" inner class.
     * Instantiate it only within subclasses of <Foo>.
     */
    public class ComponentHandler extends ComponentAdapter {
        public void componentResized(ComponentEvent e)  {
	    calculateGeometry();
	    slider.repaint();
        }
    };  

    /**
     * Focus-change listener.
     * <p>
     * This inner class is marked "public" due to a compiler bug.
     * This class should be treated as a "protected" inner class.
     * Instantiate it only within subclasses of <Foo>.
     */
    public class FocusHandler implements FocusListener {
        public void focusGained(FocusEvent e) { slider.repaint();} 
        public void focusLost(FocusEvent e) { slider.repaint();}
    };

    /**
     * Defines the action to take when scrolled.
     * <p>
     * This inner class is marked "public" due to a compiler bug.
     * This class should be treated as a "protected" inner class.
     * Instantiate it only within subclasses of <Foo>.
     */
    public class ActionScroller extends AbstractAction {
        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) {
	    if ( dir == NEGATIVE_SCROLL || dir == POSITIVE_SCROLL ) {
		int realDir = dir;
		if ( slider.getInverted() ) {
		    realDir = dir == NEGATIVE_SCROLL ? POSITIVE_SCROLL : NEGATIVE_SCROLL;
		}
		
		if ( block )
		    scrollByBlock(realDir);
		else
		    scrollByUnit(realDir);
	    }
	    else {
		if ( slider.getInverted() ) {
		    if ( dir == MIN_SCROLL )
			slider.setValue(slider.getMaximum());
		    else if ( dir == MAX_SCROLL )
			slider.setValue(slider.getMinimum());
		}
		else {
		    if ( dir == MIN_SCROLL )
			slider.setValue(slider.getMinimum());
		    else if ( dir == MAX_SCROLL )
			slider.setValue(slider.getMaximum());
		}       
	    }
	}
	public boolean isEnabled() { 
	    boolean b = true;
	    if (slider != null) {
		b = slider.isEnabled();
	    }
	    return b;
	}

    };

}