/*
 * @(#)BasicProgressBarUI.java	1.58 01/12/03
 *
 * 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.*;
import java.awt.geom.AffineTransform;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
import java.io.Serializable;

//PENDING (kwalrath): Convert to logging, add assertions.
//PENDING (kwalrath): Make sure vertical is handled.
//PENDING (kwalrath): Should right-to-left indeterminate progress bar be
//                    handled differently?
//PENDING (kwalrath): Make sure method overriding is safe (esp. for ivars).
//PENDING (kwalrath): Support program-driven frame incrementation?

/**
 * A Basic L&F implementation of ProgressBarUI.
 *
 * @version 1.58 12/03/01
 * @author Michael C. Albers
 * @author Kathy Walrath
 */
public class BasicProgressBarUI extends ProgressBarUI {
    
    private static final Dimension PREFERRED_INNER_HORIZONTAL = new Dimension(146, 12);
    private static final Dimension PREFERRED_INNER_VERTICAL = new Dimension(12, 146);
    private int cachedPercent;
    private int cellLength, cellSpacing;
    // The "selectionForeground" is the color of the text when it is painted
    // over a filled area of the progress bar. The "selectionBackground"
    // is for the text over the unfilled progress bar area.
    private Color selectionForeground, selectionBackground;
    private boolean isIndeterminate = false;

    private Animator animator; 
    private PropertyChangeListener propertyListener;

    protected JProgressBar progressBar;
    protected ChangeListener changeListener;

    /** 
     * The current state of the indeterminate animation's cycle.
     * 0, the initial value, means paint the first frame.
     * When the progress bar is indeterminate and showing,
     * the default animation thread updates this variable
     * by invoking incrementAnimationIndex()
     * every repaintInterval milliseconds.
     */
    private int animationIndex = 0;

    /**
     * The number of frames per cycle. Under the default implementation,
     * this depends on the cycleTime and repaintInterval.  It
     * must be an even number for the default painting algorithm.  This
     * value is set in the initIndeterminateValues method.
     */
    private int numFrames;   //0 1|numFrames-1 ... numFrames/2

    /**
     * Interval (in ms) between repaints of the indeterminate progress bar.
     * The value of this method is set 
     * (every time the progress bar changes to indeterminate mode)
     * using the 
     * "ProgressBar.repaintInterval" key in the defaults table.
     */
    private int repaintInterval;

    /**
     * The number of milliseconds until the animation cycle repeats.
     * The value of this method is set 
     * (every time the progress bar changes to indeterminate mode)
     * using the 
     * "ProgressBar.cycleTime" key in the defaults table.
     */
    private int cycleTime;  //must be repaintInterval*2*aPositiveInteger

    //performance stuff
    private static boolean ADJUSTTIMER = true; //makes a BIG difference;
    					       //make this false for
					       //performance tests

    //debugging; PENDING (kwalrath): convert to logging API 
    private static boolean DEBUGALL = false;  //severe performance impact
    private static boolean DEBUGTIMER = false;  //severe performance impact
    private static boolean BASICDEBUG = false;

    //performance data collection
    private static boolean LOGSTATS = false;
    private long startTime = 0;
    private long lastLoopTime = 0;
    private int numLoops = 0;

    /**                                                             
     * Used to hold the location and size of the bouncing box (returned
     * by getBox) to be painted.  
     */                                                             
    private Rectangle boxRect;
                                                                    
    /**                                                             
     * The rectangle to be updated the next time the         
     * animation thread calls repaint.  For bouncing-box            
     * animation this rect should include the union of    
     * the currently displayed box (which needs to be erased)       
     * and the box to be displayed next.
     * This rectangle's values are set in 
     * the setAnimationIndex method.
     */                                                             
    private Rectangle nextPaintRect;
                                                                    
    //cache
    /** The component's painting area, not including the border. */
    private Rectangle componentInnards;    //the current painting area
    private Rectangle oldComponentInnards; //used to see if the size changed

    /** For bouncing-box animation, the change in position per frame. */
    private double delta = 0.0;

    private int maxPosition = 0; //maximum X (horiz) or Y box location

    
    public static ComponentUI createUI(JComponent x) {
	return new BasicProgressBarUI();
    }
    
    public void installUI(JComponent c) {
	progressBar = (JProgressBar)c;
	installDefaults();
	installListeners();
    }
    
    public void uninstallUI(JComponent c) {
	uninstallDefaults();
	uninstallListeners();
	stopAnimationTimer();
	progressBar = null;
    }
    
    protected void installDefaults() {
	progressBar.setOpaque(true);
 	LookAndFeel.installBorder(progressBar,"ProgressBar.border");	
	LookAndFeel.installColorsAndFont(progressBar,
					 "ProgressBar.background",
					 "ProgressBar.foreground",
					 "ProgressBar.font");
	cellLength = UIManager.getInt("ProgressBar.cellLength");
	cellSpacing = UIManager.getInt("ProgressBar.cellSpacing");
	selectionForeground = UIManager.getColor("ProgressBar.selectionForeground");
	selectionBackground = UIManager.getColor("ProgressBar.selectionBackground");
    }
    
    protected void uninstallDefaults() {
 	LookAndFeel.uninstallBorder(progressBar);	
    }
    
    protected void installListeners() {
	//Listen for changes in the progress bar's data.
	changeListener = new ChangeHandler();
	progressBar.addChangeListener(changeListener);

	//Listen for changes between determinate and indeterminate state.
	propertyListener = new PropertyChangeHandler();
	progressBar.addPropertyChangeListener(propertyListener);
    }	
    
    /**
     * Starts the animation thread, creating and initializing
     * it if necessary.  This method is invoked when
     * the progress bar changes to indeterminate mode. 
     * If you implement your own animation thread,
     * you must override this method.
     *
     * @since 1.4
     */
    protected void startAnimationTimer() {
        if (animator == null) {
	    animator = new Animator(); 
        }

        animator.start(getRepaintInterval());
    }

    /**
     * Stops the animation thread.  This method is invoked when
     * the progress bar changes from 
     * indeterminate to determinate mode
     * and when this UI is uninstalled.
     * If you implement your own animation thread,
     * you must override this method.
     *
     * @since 1.4
     */
    protected void stopAnimationTimer() {
	if (animator != null) {
            animator.stop();
	}
    }

    /**
     * Removes all listeners installed by this object.
     */
    protected void uninstallListeners() {
	progressBar.removeChangeListener(changeListener);
	progressBar.removePropertyChangeListener(propertyListener);
    }

    
    // Many of the Basic*UI components have the following methods.
    // This component does not have these methods because *ProgressBarUI
    //  is not a compound component and does not accept input.
    //
    // protected void installComponents()
    // protected void uninstallComponents()
    // protected void installKeyboardActions()
    // protected void uninstallKeyboardActions()

    protected Dimension getPreferredInnerHorizontal() {
	return PREFERRED_INNER_HORIZONTAL;
    }
    
    protected Dimension getPreferredInnerVertical() {
	return PREFERRED_INNER_VERTICAL;
    }
    
    /**
     * The "selectionForeground" is the color of the text when it is painted
     * over a filled area of the progress bar.
     */
    protected Color getSelectionForeground() {
	return selectionForeground;
    }
    
    /**
     * The "selectionBackground" is the color of the text when it is painted
     * over an unfilled area of the progress bar.
     */
    protected Color getSelectionBackground() {
	return selectionBackground;
    }
    
    private int getCachedPercent() {
	return cachedPercent;
    }
    
    private void setCachedPercent(int cachedPercent) {
	this.cachedPercent = cachedPercent;
    }
    
    /**
     * Returns the width (if HORIZONTAL) or height (if VERTICAL)
     * of each of the indivdual cells/units to be rendered in the
     * progress bar. However, for text rendering simplification and 
     * aesthetic considerations, this function will return 1 when
     * the progress string is being rendered.
     *
     * @return the value representing the spacing between cells
     * @see    #setCellLength
     * @see    JProgressBar#isStringPainted
     */
    protected int getCellLength() {
	if (progressBar.isStringPainted()) {
	    return 1;
	} else {
	    return cellLength;
	}
    }
    
    protected void setCellLength(int cellLen) {
	this.cellLength = cellLen;
    }
    
    /**
     * Returns the spacing between each of the cells/units in the
     * progress bar. However, for text rendering simplification and 
     * aesthetic considerations, this function will return 0 when
     * the progress string is being rendered.
     *
     * @return the value representing the spacing between cells
     * @see    #setCellSpacing
     * @see    JProgressBar#isStringPainted
     */
    protected int getCellSpacing() {
	if (progressBar.isStringPainted()) {
	    return 0;
	} else {
	    return cellSpacing;
	}
    }
    
    protected void setCellSpacing(int cellSpace) {
	this.cellSpacing = cellSpace;
    }
    
    /**
     * This determines the amount of the progress bar that should be filled
     * based on the percent done gathered from the model. This is a common
     * operation so it was abstracted out. It assumes that your progress bar
     * is linear. That is, if you are making a circular progress indicator,
     * you will want to override this method.
     */
    protected int getAmountFull(Insets b, int width, int height) {
	int amountFull = 0;
	BoundedRangeModel model = progressBar.getModel();
	
	if ( (model.getMaximum() - model.getMinimum()) != 0) {
	    if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
	        amountFull = (int)Math.round(width *
					     progressBar.getPercentComplete());
	    } else {
	        amountFull = (int)Math.round(height *
					     progressBar.getPercentComplete());
	    }
	}
	return amountFull;
    }
    
    /**
     * Delegates painting to one of two methods:
     * paintDeterminate or paintIndeterminate.
     */
    public void paint(Graphics g, JComponent c) {
        if (isIndeterminate) {
            paintIndeterminate(g, c);
        } else {
            paintDeterminate(g, c);
        }
    }

    /**
     * Stores the position and size of
     * the bouncing box that would be painted for the current animation index
     * in <code>r</code> and returns <code>r</code>.
     * Subclasses that add to the painting performed
     * in this class's implementation of <code>paintIndeterminate</code> --
     * to draw an outline around the bouncing box, for example --
     * can use this method to get the location of the bouncing
     * box that was just painted.
     * By overriding this method,
     * you have complete control over the size and position 
     * of the bouncing box,
     * without having to reimplement <code>paintIndeterminate</code>.
     *
     * @param r  the Rectangle instance to be modified;
     *           may be <code>null</code>
     * @return   <code>null</code> if no box should be drawn;
     *           otherwise, returns the passed-in rectangle
     *           (if non-null)
     *           or a new rectangle
     *
     * @see #setAnimationIndex
     * @since 1.4
     */
    protected Rectangle getBox(Rectangle r) {
        int currentFrame = getAnimationIndex();
        int middleFrame = numFrames/2;

        if (DEBUGALL) {
            System.out.println("----begin getBox----");
            System.out.println("    getBox argument: " + r);
            System.out.println("    currentFrame = " + currentFrame);
            System.out.println("    middleFrame = " + middleFrame);
        }

        if (sizeChanged() || delta == 0.0 || maxPosition == 0.0) {
            updateSizes();
        }

        r = getGenericBox(r); 

        if (r == null) {
            if (DEBUGALL) {
                System.out.println("    Exiting because r is null");
            }
            return null;
        }
        if (middleFrame <= 0) {
            if (DEBUGALL) {
                System.out.println("    Exiting because middleFrame <= 0.");
            }
            return null;
        }

        //assert currentFrame >= 0 && currentFrame < numFrames
        if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
            if (currentFrame < middleFrame) {
                r.x = componentInnards.x
                      + (int)Math.round(delta * (double)currentFrame);
            } else {
                r.x = maxPosition
                      - (int)Math.round(delta * 
                                        (currentFrame - middleFrame));
            }
        } else { //VERTICAL indeterminate progress bar
            if (currentFrame < middleFrame) {
                r.y = componentInnards.y
                      + (int)Math.round(delta * currentFrame);
            } else {
                r.y = maxPosition
                      - (int)Math.round(delta *
                                        (currentFrame - middleFrame));
            }
        }

        if (DEBUGALL) {
            System.out.println("    getBox return value: " + r);
            System.out.println("----end getBox----");
        }
        return r;
    }

    /**
     * Updates delta, max position.
     * Assumes componentInnards is correct (e.g. call after sizeChanged()).
     */
    private void updateSizes() {
        if (DEBUGALL) {
            System.out.println("----begin updateSizes----");
        }

        int length = 0;

        if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
            length = getBoxLength(componentInnards.width,
                                  componentInnards.height);
            maxPosition = componentInnards.x + componentInnards.width
                          - length;

        } else { //VERTICAL progress bar
            length = getBoxLength(componentInnards.height,
                                  componentInnards.width);
            maxPosition = componentInnards.y + componentInnards.height
                          - length;
        }

        //If we're doing bouncing-box animation, update delta.
        if (DEBUGALL) {
            System.out.println("    Updating delta.");
        }

        delta = 2.0 * (double)maxPosition/(double)numFrames;

        if (BASICDEBUG) {
            System.out.println("    delta: " + delta);
            System.out.println("    maxPosition: " + maxPosition);
        }
        if (DEBUGALL) {
            System.out.println("----end updateSizes----");
        }

        return; 
    }

    /**
     * Assumes that the component innards, max position, etc. are up-to-date.
     */
    private Rectangle getGenericBox(Rectangle r) {
        if (DEBUGALL) {
            System.out.println("----begin getGenericBox----");
            System.out.println("    argument: " + r);
        }

        if (r == null) {
            r = new Rectangle();
        }

        if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
            r.width = getBoxLength(componentInnards.width,
                                   componentInnards.height);
            if (r.width < 0) {
                r = null;
            } else {
                r.height = componentInnards.height;
                r.y = componentInnards.y;
            }
          // end of HORIZONTAL

        } else { //VERTICAL progress bar
            r.height = getBoxLength(componentInnards.height,
                                    componentInnards.width);
            if (r.height < 0) {
                r = null;
            } else {
                r.width = componentInnards.width;
                r.x = componentInnards.x;
            }
        } // end of VERTICAL

        if (DEBUGALL) {
            System.out.println("    getGenericBox returns: " + r);
            System.out.println("----end getGenericBox----");
        }
        return r;
    }

    /**
     * Returns the length
     * of the "bouncing box" to be painted.
     * This method is invoked by the 
     * default implementation of <code>paintIndeterminate</code>
     * to get the width (if the progress bar is horizontal)
     * or height (if vertical) of the box.
     * For example:
     * <blockquote>
     * <pre>
     *boxRect.width = getBoxLength(componentInnards.width,
     *                             componentInnards.height);
     * </pre>
     * </blockquote>
     *
     * <p>
     * By default, this method returns the available length
     * divided by 6.  Another possibility might
     * be to make the bouncing box a square, 
     * which you could implement by overriding this method as follows:
     * <blockquote>
     * <pre>
     *protected double getBoxLength(int availableLength,
     *                              int otherDimension) {
     *    return Math.min(availableLength, otherDimension);
     *}
     * </blockquote>
     * </pre>
     *
     * @param availableLength  the amount of space available
     *                         for the bouncing box to move in;
     *                         for a horizontal progress bar,
     *                         for example,
     *                         this should be
     *                         the inside width of the progress bar
     *                         (the component width minus borders)
     * @param otherDimension   for a horizontal progress bar, this should be
     *                         the inside height of the progress bar; this
     *                         value might be used to constrain or determine
     *                         the return value 
     *
     * @return the size of the box dimension being determined; 
     *         must be no larger than <code>availableLength</code>
     *
     * @see javax.swing.SwingUtilities#calculateInnerArea
     * @since 1.4
     */
    private int getBoxLength(int availableLength, int otherDimension) {
        return (int)Math.round(availableLength/6.0);
    }

    /**
     * All purpose paint method that should do the right thing for all
     * linear bouncing-box progress bars. 
     * Override this if you are making another kind of 
     * progress bar.
     *
     * @see #paintDeterminate
     *
     * @since 1.4
     */
    protected void paintIndeterminate(Graphics g, JComponent c) {
        if (!(g instanceof Graphics2D)) {
            return;
        }

	Insets b = progressBar.getInsets(); // area for border
	int barRectWidth = progressBar.getWidth() - (b.right + b.left);
	int barRectHeight = progressBar.getHeight() - (b.top + b.bottom);

        Graphics2D g2 = (Graphics2D)g;
        if (DEBUGALL) {
            System.out.println();
            System.out.println("basic: paintIndeterminate");
        }

        // Paint the bouncing box.
        boxRect = getBox(boxRect);
        if (boxRect != null) {
            g2.setColor(progressBar.getForeground());
            g2.fillRect(boxRect.x, boxRect.y,
                       boxRect.width, boxRect.height);
        } else if (DEBUGALL) {
            //we're not initialized yet
            System.out.println("boxRect == null; returning");
        }

	// Deal with possible text painting
	if (progressBar.isStringPainted()) {
	    paintString(g2, b.left, b.top,
			barRectWidth, barRectHeight,
			0, b);
	}
    }


    /**
     * All purpose paint method that should do the right thing for almost
     * all linear, determinate progress bars. By setting a few values in
     * the defaults
     * table, things should work just fine to paint your progress bar.
     * Naturally, override this if you are making a circular or
     * semi-circular progress bar.
     * 
     * @see #paintIndeterminate
     *
     * @since 1.4
     */
    protected void paintDeterminate(Graphics g, JComponent c) {
        if (!(g instanceof Graphics2D)) {
            return;
        }

	Insets b = progressBar.getInsets(); // area for border
	int barRectWidth = progressBar.getWidth() - (b.right + b.left);
	int barRectHeight = progressBar.getHeight() - (b.top + b.bottom);

        int cellLength = getCellLength();
        int cellSpacing = getCellSpacing();
	// amount of progress to draw
	int amountFull = getAmountFull(b, barRectWidth, barRectHeight);
	
        Graphics2D g2 = (Graphics2D)g;
	g2.setColor(progressBar.getForeground());

	if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
	    // draw the cells
	    if (cellSpacing == 0 && amountFull > 0) {
                // draw one big Rect because there is no space between cells
                g2.setStroke(new BasicStroke((float)barRectHeight,
                        BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
	    } else {
                // draw each individual cell
                g2.setStroke(new BasicStroke((float)barRectHeight,
                        BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL,
                        0.f, new float[] { cellLength, cellSpacing }, 0.f));
            }

            if (BasicGraphicsUtils.isLeftToRight(c)) {
                g2.drawLine(b.left, (barRectHeight/2) + b.top,
                        amountFull + b.left, (barRectHeight/2) + b.top);
            } else {
                g2.drawLine((barRectWidth + b.left),
                        (barRectHeight/2) + b.top,
                        barRectWidth + b.left - amountFull,
                        (barRectHeight/2) + b.top);
            }
            
	} else { // VERTICAL
	    // draw the cells
	    if (cellSpacing == 0 && amountFull > 0) {
                // draw one big Rect because there is no space between cells
                g2.setStroke(new BasicStroke((float)barRectWidth,
                        BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
	    } else {
                // draw each individual cell
                g2.setStroke(new BasicStroke((float)barRectWidth,
                        BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL,
                        0f, new float[] { cellLength, cellSpacing }, 0f));
	    }

            g2.drawLine(barRectWidth/2 + b.left,
                    b.top + barRectHeight,
                    barRectWidth/2 + b.left,
                    b.top + barRectHeight - amountFull);
	}
	
	// Deal with possible text painting
	if (progressBar.isStringPainted()) {
	    paintString(g, b.left, b.top,
			barRectWidth, barRectHeight,
			amountFull, b);
	}
    }


    protected void paintString(Graphics g, int x, int y,
			       int width, int height,
			       int amountFull, Insets b) {
        if (!(g instanceof Graphics2D)) {
            return;
        }

        Graphics2D g2 = (Graphics2D)g;
	String progressString = progressBar.getString();
	g2.setFont(progressBar.getFont());
	Point renderLocation = getStringPlacement(g2, progressString,
						  x, y, width, height);
	Rectangle oldClip = g2.getClipBounds();
	
	if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
	    g2.setColor(getSelectionForeground());
	    g2.drawString(progressString, renderLocation.x, renderLocation.y);
	    g2.setColor(getSelectionBackground());
            if( BasicGraphicsUtils.isLeftToRight(progressBar) ) {
                g2.setClip(x+amountFull, y, width-amountFull, height);
            } else {
                g2.setClip(x, y, width-amountFull, height);
            }
	    g.drawString(progressString, renderLocation.x, renderLocation.y);
	} else { // VERTICAL
	    g2.setColor(getSelectionBackground());
            AffineTransform rotate =
                    AffineTransform.getRotateInstance(Math.PI/2);
            g2.setFont(progressBar.getFont().deriveFont(rotate));
	    renderLocation = getStringPlacement(g2, progressString,
						  x, y, width, height);
	    g2.drawString(progressString, renderLocation.x, renderLocation.y);
	    g2.setColor(getSelectionForeground());
	    g2.setClip(x, height-amountFull+b.top, width, height);
	    g2.drawString(progressString, renderLocation.x, renderLocation.y);
	}
	g2.setClip(oldClip);
    }
    
    
    /**
     * Designate the place where the progress string will be painted.
     * This implementation places it at the center of the progress
     * bar (in both x and y). Override this if you want to right,
     * left, top, or bottom align the progress string or if you need
     * to nudge it around for any reason.
     */
    protected Point getStringPlacement(Graphics g, String progressString,
				       int x,int y,int width,int height) {
	FontMetrics fontSizer = progressBar.getFontMetrics(
	                                    progressBar.getFont());
	int stringWidth = fontSizer.stringWidth(progressString);

	if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
	    return new Point(x + Math.round(width/2 - stringWidth/2),
			     y + ((height +
                                 fontSizer.getAscent() -
                                 fontSizer.getLeading() -
                                 fontSizer.getDescent()) / 2));
	} else { // VERTICAL
            return new Point(x + ((width - fontSizer.getAscent() +
                    fontSizer.getLeading() + fontSizer.getDescent()) / 2),
		    y + Math.round(height/2 - stringWidth/2));
	}
    }
    
    
    public Dimension getPreferredSize(JComponent c) {
	Dimension	size;
	Insets		border = progressBar.getInsets();
	FontMetrics     fontSizer = progressBar.getFontMetrics(
         	                                  progressBar.getFont());
	
	if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
	    size = new Dimension(getPreferredInnerHorizontal());
	    // Ensure that the progress string will fit
	    if (progressBar.isStringPainted()) {
		// I'm doing this for completeness.
		String progString = progressBar.getString();
		int stringWidth = fontSizer.stringWidth(progString);
		if (stringWidth > size.width) {
		    size.width = stringWidth;
		}
		// This uses both Height and Descent to be sure that 
		// there is more than enough room in the progress bar
		// for everything.
		// This does have a strange dependency on 
		// getStringPlacememnt() in a funny way.
		int stringHeight = fontSizer.getHeight() +
		                   fontSizer.getDescent();
		if (stringHeight > size.height) {
		    size.height = stringHeight;
		}
	    }
	} else {
	    size = new Dimension(getPreferredInnerVertical());
	    // Ensure that the progress string will fit.
	    if (progressBar.isStringPainted()) {
		String progString = progressBar.getString();
		int stringHeight = fontSizer.getHeight() +
                        fontSizer.getDescent();
		if (stringHeight > size.width) {
		    size.width = stringHeight;
		}
		// This is also for completeness.
		int stringWidth = fontSizer.stringWidth(progString);
		if (stringWidth > size.height) {
		    size.height = stringWidth;
		}
	    }
	}

	size.width += border.left + border.right;
	size.height += border.top + border.bottom;
	return size;
    }

    /**
     * The Minimum size for this component is 10. The rationale here 
     * is that there should be at least one pixel per 10 percent.
     */
    public Dimension getMinimumSize(JComponent c) {
	Dimension pref = getPreferredSize(progressBar);
	if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
	    pref.width = 10;
	} else {
	    pref.height = 10;
	}
	return pref;
    }

    public Dimension getMaximumSize(JComponent c) {
	Dimension pref = getPreferredSize(progressBar);
	if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
	    pref.width = Short.MAX_VALUE;
	} else {
	    pref.height = Short.MAX_VALUE;
	}
	return pref;
    }

    /**
     * Gets the index of the current animation frame.
     *
     * @since 1.4
     */
    protected int getAnimationIndex() {
	return animationIndex;
    }

    /**
     * Sets the index of the current animation frame
     * to the specified value and requests that the
     * progress bar be repainted.
     * Subclasses that don't use the default painting code
     * might need to override this method
     * to change the way that the <code>repaint</code> method
     * is invoked.
     *
     * @param newValue the new animation index; no checking
     *                 is performed on its value
     * @see incrementAnimationIndex
     *
     * @since 1.4
     */
    protected void setAnimationIndex(int newValue) {
        if (DEBUGALL) {
            System.out.println("----begin setAnimationIndex----");
            System.out.println("    argument = " + newValue);
        }

        if (animationIndex != newValue) {
            if (DEBUGALL) {
                System.out.println("    Changing animation index from "
                                   + animationIndex + " to "
                                   + newValue);
            }
            
            if (sizeChanged()) { 
                if (DEBUGALL) {
                    System.out.println("    size changed; resetting maxPosition, delta");
                }
                animationIndex = newValue;
                maxPosition = 0;  //needs to be recalculated
                delta = 0.0;      //needs to be recalculated
                progressBar.repaint();
                return;
            }

            //Get the previous box drawn.
            nextPaintRect = getBox(nextPaintRect);

            if (DEBUGALL) {
                System.out.println("    previous paint rect =  "
                                        + nextPaintRect);
                System.out.println("    before setting, boxRect =  "
                                        + boxRect);
            }

            //Update the frame number.
            animationIndex = newValue;
                
            //Get the next box to draw.
            if (nextPaintRect != null) {
                boxRect = getBox(boxRect);
                if (boxRect != null) {
                    nextPaintRect.add(boxRect);
                }
            }

            if (DEBUGALL) {
                System.out.println("    after setting, boxRect =  "
                                        + boxRect);
                System.out.println("    after setting, nextPaintRect =  "
                                        + nextPaintRect);
            }
        } else { //animationIndex == newValue
            if (DEBUGALL) {
                System.out.println("    No change in value");
                System.out.println("----end setAnimationIndex----");
            }
            return;
        }

        if (nextPaintRect != null) {
            progressBar.repaint(nextPaintRect);
        } else {
            progressBar.repaint();
            if (DEBUGALL) {
                System.out.println("    repaint without args");
            }
        }

        if (DEBUGALL) {
            System.out.println("----end setAnimationIndex----");
        }
    }

    private boolean sizeChanged() {
        if ((oldComponentInnards == null) || (componentInnards == null)) {
	    return true;
	}

        oldComponentInnards.setRect(componentInnards);
        componentInnards = SwingUtilities.calculateInnerArea(progressBar,
	                                                     componentInnards);
        return !oldComponentInnards.equals(componentInnards);
    }

    /**
     * Sets the index of the current animation frame,
     * to the next valid value,
     * which results in the progress bar being repainted.
     * The next valid value is, by default,
     * the current animation index plus one.
     * If the new value would be too large, 
     * this method sets the index to 0.
     * Subclasses might need to override this method
     * to ensure that the index does not go over
     * the number of frames needed for the particular 
     * progress bar instance.
     * This method is invoked by the default animation thread
     * every <em>X</em> milliseconds, 
     * where <em>X</em> is specified by the "ProgressBar.repaintInterval"
     * UI default.
     *
     * @see setAnimationIndex
     * @since 1.4
     */
    protected void incrementAnimationIndex() {
        int newValue = getAnimationIndex() + 1;
        if (DEBUGALL) {
            System.out.println();
            System.out.println("----begin incrementAnimationIndex----");
            System.out.println("    newValue = " + newValue);
            System.out.println("    numFrames = " + numFrames);
        }

        if (newValue < numFrames) {
            setAnimationIndex(newValue);
        } else {
            setAnimationIndex(0);
            if (LOGSTATS) {
                numLoops++;
                long time = System.currentTimeMillis();
                System.out.println("Loop #" + numLoops + ": "
                                   + (time - lastLoopTime)
                                   + " (" + (time - startTime)
                                   + " total)");
                lastLoopTime = time;
            }
        }
        if (DEBUGALL) {
            System.out.println("----end incrementAnimationIndex----");
        }
    }

    /**
     * Returns the desired number of milliseconds between repaints.
     * This value is meaningful
     * only if the progress bar is in indeterminate mode.
     * The repaint interval determines how often the 
     * default animation thread's timer is fired.
     * It's also used by the default indeterminate progress bar
     * painting code when determining
     * how far to move the bouncing box per frame.
     * The repaint interval is specified by
     * the "ProgressBar.repaintInterval" UI default.
     * 
     * @return  the repaint interval, in milliseconds
     */
    private int getRepaintInterval() {
        return repaintInterval;
    }

    private int initRepaintInterval() {
        repaintInterval = UIManager.getInt("ProgressBar.repaintInterval");
        if (BASICDEBUG) {
            System.out.println("    value of ProgressBar.repaintInterval is "
                                   + repaintInterval);
        }
        return repaintInterval;
    }

    /**
     * Returns the number of milliseconds per animation cycle.
     * This value is meaningful
     * only if the progress bar is in indeterminate mode.
     * The cycle time is used by the default indeterminate progress bar
     * painting code when determining
     * how far to move the bouncing box per frame.
     * The cycle time is specified by
     * the "ProgressBar.cycleTime" UI default
     * and adjusted, if necessary,
     * by the initIndeterminateDefaults method.
     * 
     * @return  the cycle time, in milliseconds
     */
    private int getCycleTime() {
        return cycleTime;
    }

    private int initCycleTime() {
        cycleTime = UIManager.getInt("ProgressBar.cycleTime");
        if (BASICDEBUG) {
            System.out.println("    value of ProgressBar.cycleTime is "
                                   + cycleTime);
        }
        return cycleTime;
    }


    /** Initialize cycleTime, repaintInterval, numFrames, animationIndex. */
    private void initIndeterminateDefaults() {
        if (DEBUGALL) {
            System.out.println("----begin initIndeterminateDefaults----");
        }
        initRepaintInterval(); //initialize repaint interval
        initCycleTime();       //initialize cycle length

        // Make sure repaintInterval is reasonable.
        if (repaintInterval <= 0) {
            repaintInterval = 100;
        }

        // Make sure cycleTime is reasonable.
        if (repaintInterval > cycleTime) {
            cycleTime = repaintInterval * 20;
            if (DEBUGALL) {
                System.out.println("cycleTime changed to " + cycleTime);
            }
        } else {
            // Force cycleTime to be a even multiple of repaintInterval.
            int factor = (int)Math.ceil(
                                 ((double)cycleTime)
                               / ((double)repaintInterval*2));
            if (DEBUGALL) {
                int newCycleTime = repaintInterval*factor*2; 
                if (cycleTime != newCycleTime) {
                    System.out.println("cycleTime being changed to "
                                       + newCycleTime);
                }
            }
    
            cycleTime = repaintInterval*factor*2;
        }

        if (BASICDEBUG) {
            System.out.println("    cycle length: " + cycleTime);
            System.out.println("    repaint interval: " + repaintInterval);
        }
        if (DEBUGALL) {
            System.out.println("----end initIndeterminateDefaults----");
        }
    }

    /**
     * Invoked by PropertyChangeHandler before startAnimationTimer().
     *
     *  NOTE: This might not be invoked until after the first
     *  paintIndeterminate call.
     */
    private void initIndeterminateValues() {
        if (DEBUGALL) {
            System.out.println();
            System.out.println("----begin initIndeterminateValues----");
        }
        if (LOGSTATS) {
            startTime = lastLoopTime = System.currentTimeMillis();
            numLoops = 0;
        }
                                                                            
        if (BASICDEBUG) {
            System.out.println("ADJUSTTIMER = " + ADJUSTTIMER);
        }
    
        initIndeterminateDefaults();
        //assert cycleTime/repaintInterval is a whole multiple of 2.
        numFrames = cycleTime/repaintInterval;
        initAnimationIndex();
            
        boxRect = new Rectangle();
        nextPaintRect = new Rectangle();
        componentInnards = new Rectangle();
        oldComponentInnards = new Rectangle();

        if (BASICDEBUG) {
            System.out.println("    numFrames: " + numFrames);
        }
        if (DEBUGALL) {
            System.out.println("----end initIndeterminateValues----");
        }
    }

    /** Invoked by PropertyChangeHandler after stopAnimationTimer(). */
    private void cleanUpIndeterminateValues() {
        if (DEBUGALL) {
            System.out.println();
            System.out.println("----begin cleanUpIndeterminateValues----");
        }
                                                                            
        cycleTime = repaintInterval = 0;
        numFrames = animationIndex = 0;
        maxPosition = 0;
        delta = 0.0;

        boxRect = nextPaintRect = null;
        componentInnards = oldComponentInnards = null;

        if (LOGSTATS) {
            startTime = lastLoopTime = numLoops = 0;
        }

        if (DEBUGALL) {
            System.out.println("----end cleanUpIndeterminateValues----");
        }
    }

    // Called from initIndeterminateValues to initialize the animation index.
    // This assumes that numFrames is set to a correct value.
    private void initAnimationIndex() {
        if ((progressBar.getOrientation() == JProgressBar.HORIZONTAL) &&
            (BasicGraphicsUtils.isLeftToRight(progressBar))) {
            // If this is a left-to-right progress bar,
	    // start at the first frame.
            setAnimationIndex(0);
        } else {
            // If we go right-to-left or vertically, start at the right/bottom.
            setAnimationIndex(numFrames/2);
        }
    }

    //
    // Animation Thread
    //
    /**
     * Implements an animation thread that invokes repaint
     * at a fixed rate.  If ADJUSTTIMER is true, this thread
     * will continuously adjust the repaint interval to 
     * try to make the actual time between repaints match
     * the requested rate.  
     */
    private class Animator implements ActionListener {
        private Timer timer;
        private long previousDelay; //used to tune the repaint interval
        private int interval; //the fixed repaint interval
        private long lastCall; //the last time actionPerformed was called
        private int MINIMUM_DELAY = 5;

	/**
	 * Creates a timer if one doesn't already exist, 
	 * then starts the timer thread.
	 */
        private void start(int interval) {
            previousDelay = interval;
            lastCall = 0;

	    if (timer == null) {
                timer = new Timer(interval, this);
	    } else {
                timer.setDelay(interval);
	    }

	    if (ADJUSTTIMER) {
		timer.setRepeats(false);
                timer.setCoalesce(false);
	    }

	    timer.start();
	}

	/**
	 * Stops the timer thread.
	 */
	private void stop() {
	    timer.stop();
	}

	/**
	 * Reacts to the timer's action events.
	 */
	public void actionPerformed(ActionEvent e) {
            if (ADJUSTTIMER) {
                long time = System.currentTimeMillis();

                if (lastCall > 0) { //adjust nextDelay
                //XXX maybe should cache this after a while
                    //actual = time - lastCall
                    //difference = actual - interval
                    //nextDelay = previousDelay - difference
                    //          = previousDelay - (time - lastCall - interval)
                   int nextDelay = (int)(previousDelay
                                          - time + lastCall
                                          + getRepaintInterval());
                    if (nextDelay < MINIMUM_DELAY) {
                        nextDelay = MINIMUM_DELAY;
                    }
                    timer.setInitialDelay(nextDelay);
                    previousDelay = nextDelay;
                    if (DEBUGTIMER) {
                        System.out.println("---------------------");
                        System.out.println("actual delay = "
                                           + (time - lastCall));
                        System.out.println("next delay = " + nextDelay);
                    }
                }
                timer.start();
                lastCall = time;
            }

	    incrementAnimationIndex(); //paint next frame
	}
    }


    //
    // Property Change Events
    //
    /**
     * [PENDING: add doc here]
     * [PENDING: make this static?]
     */
    private class PropertyChangeHandler implements PropertyChangeListener {
	public void propertyChange(PropertyChangeEvent e) {
	    String prop = e.getPropertyName();
	    if ("indeterminate".equals(prop)) {
		isIndeterminate = progressBar.isIndeterminate();
    
		if (isIndeterminate) {
                    initIndeterminateValues();

		    //start the animation thread
		    startAnimationTimer();
	        } else {
	            //stop the animation thread
	            stopAnimationTimer();

                    //clean up
                    cleanUpIndeterminateValues();
                }
    
                progressBar.repaint();
            }
        }
    }


    //
    // Change Events
    //
    /**
     * This inner class is marked &quot;public&quot; due to a compiler bug.
     * This class should be treated as a &quot;protected&quot; inner class.
     * Instantiate it only within subclasses of BasicProgressBarUI.
     */
    public class ChangeHandler implements ChangeListener {
	public void stateChanged(ChangeEvent e) {
	    BoundedRangeModel model = progressBar.getModel();
	    int newRange = model.getMaximum() - model.getMinimum();
	    int newPercent;
	    int oldPercent = getCachedPercent();
	    
	    if (newRange > 0) {
		newPercent = (int)((100 * (long)model.getValue()) / newRange);
	    } else {
		newPercent = 0;
	    }
	    
	    if (newPercent != oldPercent) {
		setCachedPercent(newPercent);
		progressBar.repaint();
	    }
	}
    }
}
