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package javax.swing.plaf.basic;

import sun.swing.SwingUtilities2;
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;
import sun.swing.DefaultLookup;


A Basic L&F implementation of ProgressBarUI.

Author:Michael C. Albers, Kathy Walrath
/**
 * A Basic L&F implementation of ProgressBarUI.
 *
 * @author Michael C. Albers
 * @author Kathy Walrath
 */
public class BasicProgressBarUI extends ProgressBarUI {
    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 Animator animator;

    
The instance of JProgressBar. 
/**
     * The instance of {@code JProgressBar}.
     */
    protected JProgressBar progressBar;
    
The instance of ChangeListener. 
/**
     * The instance of {@code ChangeListener}.
     */
    protected ChangeListener changeListener;
    private Handler handler;

    
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.

/**
     * 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.

/**
     * 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.

/**
     * 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.

/**
     * 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

    
Used to hold the location and size of the bouncing box (returned
by getBox) to be painted.

Since:1.5
/**
     * Used to hold the location and size of the bouncing box (returned
     * by getBox) to be painted.
     *
     * @since 1.5
     */
    protected 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.

/**
     * 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. 
/** 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. 
/** 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

    
Returns a new instance of BasicProgressBarUI. 
Params:
  • x – a component
Returns:a new instance of BasicProgressBarUI
/**
     * Returns a new instance of {@code BasicProgressBarUI}.
     *
     * @param x a component
     * @return a new instance of {@code BasicProgressBarUI}
     */
    public static ComponentUI createUI(JComponent x) {
        return new BasicProgressBarUI();
    }

    public void installUI(JComponent c) {
        progressBar = (JProgressBar)c;
        installDefaults();
        installListeners();
        if (progressBar.isIndeterminate()) {
            initIndeterminateValues();
        }
    }

    public void uninstallUI(JComponent c) {
        if (progressBar.isIndeterminate()) {
            cleanUpIndeterminateValues();
        }
        uninstallDefaults();
        uninstallListeners();
        progressBar = null;
    }

    
Installs default properties.

/**
     * Installs default properties.
     */
    protected void installDefaults() {
        LookAndFeel.installProperty(progressBar, "opaque", Boolean.TRUE);
        LookAndFeel.installBorder(progressBar,"ProgressBar.border");
        LookAndFeel.installColorsAndFont(progressBar,
                                         "ProgressBar.background",
                                         "ProgressBar.foreground",
                                         "ProgressBar.font");
        cellLength = UIManager.getInt("ProgressBar.cellLength");
        if (cellLength == 0) cellLength = 1;
        cellSpacing = UIManager.getInt("ProgressBar.cellSpacing");
        selectionForeground = UIManager.getColor("ProgressBar.selectionForeground");
        selectionBackground = UIManager.getColor("ProgressBar.selectionBackground");
    }

    
Unintalls default properties.

/**
     * Unintalls default properties.
     */
    protected void uninstallDefaults() {
        LookAndFeel.uninstallBorder(progressBar);
    }

    
Registers listeners.

/**
     * Registers listeners.
     */
    protected void installListeners() {
        //Listen for changes in the progress bar's data.
        changeListener = getHandler();
        progressBar.addChangeListener(changeListener);

        //Listen for changes between determinate and indeterminate state.
        progressBar.addPropertyChangeListener(getHandler());
    }

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

    
Starts the animation thread, creating and initializing
it if necessary. This method is invoked when an
indeterminate progress bar should start animating.
Reasons for this may include:

    
   
  • The progress bar is determinate and becomes displayable
   
  • The progress bar is displayable and becomes determinate
   
  • The progress bar is displayable and determinate and this
       UI is installed


If you implement your own animation thread,
you must override this method.

See Also:
Since:1.4
/**
     * Starts the animation thread, creating and initializing
     * it if necessary. This method is invoked when an
     * indeterminate progress bar should start animating.
     * Reasons for this may include:
     * <ul>
     *    <li>The progress bar is determinate and becomes displayable
     *    <li>The progress bar is displayable and becomes determinate
     *    <li>The progress bar is displayable and determinate and this
     *        UI is installed
     * </ul>
     * If you implement your own animation thread,
     * you must override this method.
     *
     * @since 1.4
     * @see #stopAnimationTimer
     */
    protected void startAnimationTimer() {
        if (animator == null) {
            animator = new Animator();
        }

        animator.start(getRepaintInterval());
    }

    
Stops the animation thread.
This method is invoked when the indeterminate
animation should be stopped. Reasons for this may include:

    
   
  • The progress bar changes to determinate
   
  • The progress bar is no longer part of a displayable hierarchy
   
  • This UI in uninstalled


If you implement your own animation thread,
you must override this method.

See Also:
Since:1.4
/**
     * Stops the animation thread.
     * This method is invoked when the indeterminate
     * animation should be stopped. Reasons for this may include:
     * <ul>
     *    <li>The progress bar changes to determinate
     *    <li>The progress bar is no longer part of a displayable hierarchy
     *    <li>This UI in uninstalled
     * </ul>
     * If you implement your own animation thread,
     * you must override this method.
     *
     * @since 1.4
     * @see #startAnimationTimer
     */
    protected void stopAnimationTimer() {
        if (animator != null) {
            animator.stop();
        }
    }

    
Removes all listeners installed by this object.

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


    
Returns the baseline.

Throws:
See Also:
Since:1.6
/**
     * Returns the baseline.
     *
     * @throws NullPointerException {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public int getBaseline(JComponent c, int width, int height) {
        super.getBaseline(c, width, height);
        if (progressBar.isStringPainted() &&
                progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
            FontMetrics metrics = progressBar.
                    getFontMetrics(progressBar.getFont());
            Insets insets = progressBar.getInsets();
            int y = insets.top;
            height = height - insets.top - insets.bottom;
            return y + (height + metrics.getAscent() -
                        metrics.getLeading() -
                        metrics.getDescent()) / 2;
        }
        return -1;
    }

    
Returns an enum indicating how the baseline of the component
changes as the size changes.

Throws:
  • NullPointerException – {@inheritDoc}
See Also:
Since:1.6
/**
     * Returns an enum indicating how the baseline of the component
     * changes as the size changes.
     *
     * @throws NullPointerException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public Component.BaselineResizeBehavior getBaselineResizeBehavior(
            JComponent c) {
        super.getBaselineResizeBehavior(c);
        if (progressBar.isStringPainted() &&
                progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
            return Component.BaselineResizeBehavior.CENTER_OFFSET;
        }
        return Component.BaselineResizeBehavior.OTHER;
    }

    // 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()

    
Returns preferred size of the horizontal JProgressBar. 
Returns:preferred size of the horizontal JProgressBar
/**
     * Returns preferred size of the horizontal {@code JProgressBar}.
     *
     * @return preferred size of the horizontal {@code JProgressBar}
     */
    protected Dimension getPreferredInnerHorizontal() {
        Dimension horizDim = (Dimension)DefaultLookup.get(progressBar, this,
            "ProgressBar.horizontalSize");
        if (horizDim == null) {
            horizDim = new Dimension(146, 12);
        }
        return horizDim;
    }

    
Returns preferred size of the vertical JProgressBar. 
Returns:preferred size of the vertical JProgressBar
/**
     * Returns preferred size of the vertical {@code JProgressBar}.
     *
     * @return preferred size of the vertical {@code JProgressBar}
     */
    protected Dimension getPreferredInnerVertical() {
        Dimension vertDim = (Dimension)DefaultLookup.get(progressBar, this,
            "ProgressBar.verticalSize");
        if (vertDim == null) {
            vertDim = new Dimension(12, 146);
        }
        return vertDim;
    }

    
The "selectionForeground" is the color of the text when it is painted
over a filled area of the progress bar.

Returns:the color of the selected foreground
/**
     * The "selectionForeground" is the color of the text when it is painted
     * over a filled area of the progress bar.
     *
     * @return the color of the selected foreground
     */
    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.

Returns:the color of the selected background
/**
     * The "selectionBackground" is the color of the text when it is painted
     * over an unfilled area of the progress bar.
     *
     * @return the color of the selected background
     */
    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 individual 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.

See Also:
Returns:the value representing the spacing between cells
/**
     * Returns the width (if HORIZONTAL) or height (if VERTICAL)
     * of each of the individual 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;
        }
    }

    
Sets the cell length.

Params:
  • cellLen – a new cell length
/**
     * Sets the cell length.
     *
     * @param cellLen a new cell length
     */
    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.

See Also:
Returns:the value representing the spacing between cells
/**
     * 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;
        }
    }

    
Sets the cell spacing.

Params:
  • cellSpace – a new cell spacing
/**
     * Sets the cell spacing.
     *
     * @param cellSpace a new cell spacing
     */
    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.

Params:
  • b – insets
  • width – a width
  • height – a height
Returns:the amount of the progress bar that should be filled
/**
     * 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.
     *
     * @param b insets
     * @param width a width
     * @param height a height
     * @return the amount of the progress bar that should be filled
     */
    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.

/**
     * Delegates painting to one of two methods:
     * paintDeterminate or paintIndeterminate.
     */
    public void paint(Graphics g, JComponent c) {
        if (progressBar.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 r and returns r.
Subclasses that add to the painting performed
in this class's implementation of paintIndeterminate --
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 paintIndeterminate.

Params:
  • r –  the Rectangle instance to be modified;
          may be null
See Also:
Returns:  null if no box should be drawn;
          otherwise, returns the passed-in rectangle
          (if non-null)
          or a new rectangle
Since:1.4
/**
     * 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 (sizeChanged() || delta == 0.0 || maxPosition == 0.0) {
            updateSizes();
        }

        r = getGenericBox(r);

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

    
Updates delta, max position.
Assumes componentInnards is correct (e.g. call after sizeChanged()).

/**
     * Updates delta, max position.
     * Assumes componentInnards is correct (e.g. call after sizeChanged()).
     */
    private void 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.
        delta = 2.0 * (double)maxPosition/(double)numFrames;
    }

    
Assumes that the component innards, max position, etc. are up-to-date.

/**
     * Assumes that the component innards, max position, etc. are up-to-date.
     */
    private Rectangle getGenericBox(Rectangle 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

        return r;
    }

    
Returns the length
of the "bouncing box" to be painted.
This method is invoked by the
default implementation of paintIndeterminate
to get the width (if the progress bar is horizontal)
or height (if vertical) of the box.
For example:



boxRect.width = getBoxLength(componentInnards.width,
                            componentInnards.height);





Params:
  • 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)
  • 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
See Also:
Returns:the size of the box dimension being determined;
        must be no larger than availableLength
Since:1.5
/**
     * 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>
     *
     * @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 1.5
     */
    protected 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.

Params:
  • g – an instance of Graphics
  • c – a component
See Also:
Since:1.4
/**
     * 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.
     *
     * @param g an instance of {@code Graphics}
     * @param c a component
     * @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);

        if (barRectWidth <= 0 || barRectHeight <= 0) {
            return;
        }

        Graphics2D g2 = (Graphics2D)g;

        // Paint the bouncing box.
        boxRect = getBox(boxRect);
        if (boxRect != null) {
            g2.setColor(progressBar.getForeground());
            g2.fillRect(boxRect.x, boxRect.y,
                       boxRect.width, boxRect.height);
        }

        // Deal with possible text painting
        if (progressBar.isStringPainted()) {
            if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
                paintString(g2, b.left, b.top,
                            barRectWidth, barRectHeight,
                            boxRect.x, boxRect.width, b);
            }
            else {
                paintString(g2, b.left, b.top,
                            barRectWidth, barRectHeight,
                            boxRect.y, boxRect.height, 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.

Params:
  • g – an instance of Graphics
  • c – a component
See Also:
Since:1.4
/**
     * 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.
     *
     * @param g an instance of {@code Graphics}
     * @param c a component
     * @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);

        if (barRectWidth <= 0 || barRectHeight <= 0) {
            return;
        }

        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);
        }
    }

    
Paints the progress string.

Params:
  • g – an instance of Graphics
  • x – X location of bounding box
  • y – Y location of bounding box
  • width – width of bounding box
  • height – height of bounding box
  • amountFull – size of the fill region, either width or height
       depending upon orientation.
  • b – Insets of the progress bar.
/**
     * Paints the progress string.
     *
     * @param g an instance of {@code Graphics}
     * @param x X location of bounding box
     * @param y Y location of bounding box
     * @param width width of bounding box
     * @param height height of bounding box
     * @param amountFull size of the fill region, either width or height
     *        depending upon orientation.
     * @param b Insets of the progress bar.
     */
    protected void paintString(Graphics g, int x, int y,
                               int width, int height,
                               int amountFull, Insets b) {
        if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
            if (BasicGraphicsUtils.isLeftToRight(progressBar)) {
                if (progressBar.isIndeterminate()) {
                    boxRect = getBox(boxRect);
                    paintString(g, x, y, width, height,
                            boxRect.x, boxRect.width, b);
                } else {
                    paintString(g, x, y, width, height, x, amountFull, b);
                }
            }
            else {
                paintString(g, x, y, width, height, x + width - amountFull,
                            amountFull, b);
            }
        }
        else {
            if (progressBar.isIndeterminate()) {
                boxRect = getBox(boxRect);
                paintString(g, x, y, width, height,
                        boxRect.y, boxRect.height, b);
            } else {
                paintString(g, x, y, width, height, y + height - amountFull,
                        amountFull, b);
            }
        }
    }

    
Paints the progress string.

Params:
  • g – Graphics used for drawing.
  • x – x location of bounding box
  • y – y location of bounding box
  • width – width of bounding box
  • height – height of bounding box
  • fillStart – start location, in x or y depending on orientation,
       of the filled portion of the progress bar.
  • amountFull – size of the fill region, either width or height
       depending upon orientation.
  • b – Insets of the progress bar.
/**
     * Paints the progress string.
     *
     * @param g Graphics used for drawing.
     * @param x x location of bounding box
     * @param y y location of bounding box
     * @param width width of bounding box
     * @param height height of bounding box
     * @param fillStart start location, in x or y depending on orientation,
     *        of the filled portion of the progress bar.
     * @param amountFull size of the fill region, either width or height
     *        depending upon orientation.
     * @param b Insets of the progress bar.
     */
    private void paintString(Graphics g, int x, int y, int width, int height,
                             int fillStart, 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(getSelectionBackground());
            SwingUtilities2.drawString(progressBar, g2, progressString,
                                       renderLocation.x, renderLocation.y);
            g2.setColor(getSelectionForeground());
            g2.clipRect(fillStart, y, amountFull, height);
            SwingUtilities2.drawString(progressBar, g2, 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);
            SwingUtilities2.drawString(progressBar, g2, progressString,
                                       renderLocation.x, renderLocation.y);
            g2.setColor(getSelectionForeground());
            g2.clipRect(x, fillStart, width, amountFull);
            SwingUtilities2.drawString(progressBar, g2, 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.

Params:
  • g – an instance of Graphics
  • progressString – a text
  • x – an X coordinate
  • y – an Y coordinate
  • width – a width
  • height – a height
Returns:the place where the progress string will be painted
/**
     * 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.
     *
     * @param g an instance of {@code Graphics}
     * @param progressString a text
     * @param x an X coordinate
     * @param y an Y coordinate
     * @param width a width
     * @param height a height
     * @return the place where the progress string will be painted
     */
    protected Point getStringPlacement(Graphics g, String progressString,
                                       int x,int y,int width,int height) {
        FontMetrics fontSizer = SwingUtilities2.getFontMetrics(progressBar, g,
                                            progressBar.getFont());
        int stringWidth = SwingUtilities2.stringWidth(progressBar, fontSizer,
                                                      progressString);

        if (progressBar.getOrientation() == JProgressBar.HORIZONTAL) {
            return new Point(x + (int)Math.round(width/2.0 - stringWidth/2.0),
                             y + ((height +
                                 fontSizer.getAscent() -
                                 fontSizer.getLeading() -
                                 fontSizer.getDescent()) / 2));
        } else { // VERTICAL
            return new Point(x + ((width - fontSizer.getAscent() +
                    fontSizer.getLeading() + fontSizer.getDescent()) / 2),
                    y + (int)Math.round(height/2.0 - stringWidth/2.0));
        }
    }


    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 = SwingUtilities2.stringWidth(
                          progressBar, fontSizer, 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 = SwingUtilities2.stringWidth(
                                       progressBar, fontSizer, 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.

/**
     * 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.

Returns:the index of the current animation frame
Since:1.4
/**
     * Gets the index of the current animation frame.
     *
     * @return 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.

Returns:the number of frames
Since:1.6
/**
     * 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 repaint method
is invoked.

Params:
  • newValue – the new animation index; no checking
                is performed on its value
See Also:
Since:1.4
/**
     * 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 X milliseconds,
where X is specified by the "ProgressBar.repaintInterval"
UI default.

See Also:
  • setAnimationIndex
Since:1.4
/**
     * 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.

Returns: the repaint interval, in milliseconds
/**
     * 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.

Returns: the cycle time, in milliseconds
/**
     * 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. 
/** 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.

/**
     * 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. 
/** 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.

/**
     * 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.

/**
         * 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.

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

        
Reacts to the timer's action events.

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


    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();
                    }
                }
            }
        }
    }
}