basicprogressbarui.java

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		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;
    }

    /**
     * Returns the number of frames for the complete animation loop
     * used by an indeterminate JProgessBar. The progress chunk will go
     * from one end to the other and back during the entire loop. This
     * visual behavior may be changed by subclasses in other Look and Feels.
     * 
     * @return the number of frames
     * @since 1.6
     */
    protected final int getFrameCount() {
        return numFrames;
    }

    /**
     * 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 (animationIndex != newValue) {
            if (sizeChanged()) { 
                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);

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

        if (nextPaintRect != null) {
            progressBar.repaint(nextPaintRect);
        } else {
            progressBar.repaint();
        }
    }

    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 (newValue < numFrames) {
            setAnimationIndex(newValue);
        } else {
            setAnimationIndex(0);
        }
    }

    /**
     * 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 = DefaultLookup.getInt(progressBar,
                this, "ProgressBar.repaintInterval", 50);
        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 = DefaultLookup.getInt(progressBar, this,
                "ProgressBar.cycleTime", 3000);
        return cycleTime;
    }


    /** Initialize cycleTime, repaintInterval, numFrames, animationIndex. */
    private void 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;
        } else {
            // Force cycleTime to be a even multiple of repaintInterval.
            int factor = (int)Math.ceil(
                                 ((double)cycleTime)
                               / ((double)repaintInterval*2));
            cycleTime = repaintInterval*factor*2;
        }
    }

    /**
     * Invoked by PropertyChangeHandler.
     *
     *  NOTE: This might not be invoked until after the first
     *  paintIndeterminate call.
     */
    private void initIndeterminateValues() {
        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();

        // we only bother installing the HierarchyChangeListener if we
        // are indeterminate
        progressBar.addHierarchyListener(getHandler());

        // start the animation thread if necessary
        if (progressBar.isDisplayable()) {
            startAnimationTimer();
        }
    }

    /** Invoked by PropertyChangeHandler. */
    private void cleanUpIndeterminateValues() {
        // stop the animation thread if necessary
        if (progressBar.isDisplayable()) {
            stopAnimationTimer();
        }

        cycleTime = repaintInterval = 0;
        numFrames = animationIndex = 0;
        maxPosition = 0;
        delta = 0.0;

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

        progressBar.removeHierarchyListener(getHandler());
    }

    // 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;
                }
                timer.start();
                lastCall = time;
            }

	    incrementAnimationIndex(); //paint next frame
	}
    }


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


    private class Handler implements ChangeListener, PropertyChangeListener, HierarchyListener {
        // 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();
	    }
	}

        // PropertyChangeListener
	public void propertyChange(PropertyChangeEvent e) {
	    String prop = e.getPropertyName();
	    if ("indeterminate" == prop) {
		if (progressBar.isIndeterminate()) {
                    initIndeterminateValues();
	        } else {
                    //clean up
                    cleanUpIndeterminateValues();
                }
                progressBar.repaint();
            }
        }
        
        // we don't want the animation to keep running if we're not displayable
        public void hierarchyChanged(HierarchyEvent he) {
            if ((he.getChangeFlags() & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0) {
                if (progressBar.isIndeterminate()) {
                    if (progressBar.isDisplayable()) {
                        startAnimationTimer();
                    } else {
                        stopAnimationTimer();
                    }
                }
            }
        }
    }
}