8sa1-gcc/libjava/javax/swing/plaf/basic/BasicProgressBarUI.java

/* BasicProgressBarUI.java --
   Copyright (C) 2004, 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package javax.swing.plaf.basic;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.JComponent;
import javax.swing.JProgressBar;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.UIDefaults;
import javax.swing.UIManager;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.ProgressBarUI;

/**
 * The Basic Look and Feel UI delegate for the 
 * JProgressBar.
 */
public class BasicProgressBarUI extends ProgressBarUI
{
  /**
   * A helper class that listens for ChangeEvents 
   * from the progressBar's model.
   */
  protected class ChangeHandler implements ChangeListener
  {
    /**
     * Called every time the state of the model changes.
     *
     * @param e The ChangeEvent given by the model.
     */
    public void stateChanged(ChangeEvent e)
    {
      // Nothing to do but repaint.
      progressBar.repaint();
    }
  }

  /**
   * This helper class is used to listen for 
   * PropertyChangeEvents from the progressBar.
   */
  private class PropertyChangeHandler implements PropertyChangeListener
  {
    /**
     * Called every time the properties of the 
     * progressBar change.
     *
     * @param e The PropertyChangeEvent given by the progressBar.
     */
    public void propertyChange(PropertyChangeEvent e)
    {
      // Only need to listen for indeterminate changes.
      // All other things are done on a repaint.
      if (e.getPropertyName().equals("inderterminate"))
	if (((Boolean) e.getNewValue()).booleanValue())
	  startAnimationTimer();
	else
	  stopAnimationTimer();
      else
        progressBar.repaint();
    }
  }

  /**
   * This helper class is used to listen for 
   * the animationTimer's intervals. On every interval,
   * the bouncing box should move.
   */
  private class Animator implements ActionListener
  {
    /**
     * Called every time the animationTimer reaches
     * its interval.
     *
     * @param e The ActionEvent given by the timer.
     */
    public void actionPerformed(ActionEvent e)
    {
      // Incrementing the animation index will cause
      // a repaint.
      incrementAnimationIndex();
    }
  }

  /** The timer used to move the bouncing box. */
  private transient Timer animationTimer;

  // The total number of frames must be an even number.
  // The total number of frames is calculated from
  // the cycleTime and repaintInterval given by
  // the basic Look and Feel defaults.
  //
  // +-----------------------------------------------+
  // | frame0 | frame1 | frame2 | frame 3 | frame 4  |
  // |        | frame7 | frame6 | frame 5 |          |
  // +-----------------------------------------------+
  
  /** The current animation index. */
  private transient int animationIndex;

  /** The total number of frames.*/
  private transient int numFrames;

  /** The helper that moves the bouncing box. */
  private transient Animator animation;

  /** The helper that listens for property change events. */
  private transient PropertyChangeHandler propertyListener;

  /** The Listener for the model. */
  protected ChangeListener changeListener;

  /** The progressBar for this UI. */
  protected JProgressBar progressBar;

  /** The length of the cell. The cell is the painted part. */
  private transient int cellLength;

  /** The gap between cells. */
  private transient int cellSpacing;

  /** The color of the text when the bar is not over it.*/
  private transient Color selectionBackground;

  /** The color of the text when the bar is over it. */
  private transient Color selectionForeground;

  /**
   * Creates a new BasicProgressBarUI object.
   */
  public BasicProgressBarUI()
  {
    super();
  }

  /**
   * Creates a new BasicProgressBarUI for the component.
   *
   * @param x The JComponent to create the UI for.
   *
   * @return A new BasicProgressBarUI.
   */
  public static ComponentUI createUI(JComponent x)
  {
    return new BasicProgressBarUI();
  }

  /**
   * This method returns the length of the bar (from the minimum)
   * in pixels (or units that the Graphics object draws in) based
   * on the progressBar's getPercentComplete() value.
   *
   * @param b The insets of the progressBar.
   * @param width The width of the progressBar.
   * @param height The height of the progressBar.
   *
   * @return The length of the bar that should be painted in pixels.
   */
  protected int getAmountFull(Insets b, int width, int height)
  {
    double percentDone = progressBar.getPercentComplete();
    if (progressBar.getOrientation() == JProgressBar.HORIZONTAL)
      return (int) (percentDone * (width - b.left - b.right));
    else
      return (int) (percentDone * (height - b.top - b.bottom));
  }

  /**
   * The current animation index.
   *
   * @return The current animation index.
   */
  protected int getAnimationIndex()
  {
    return animationIndex;
  }

  /**
   * This method returns the size and position of the bouncing box
   * for the current animation index. It stores the values in the 
   * given rectangle and returns it. It returns null if no box should
   * be drawn.
   *
   * @param r The bouncing box rectangle.
   *
   * @return The bouncing box rectangle.
   */
  protected Rectangle getBox(Rectangle r)
  {
    if (!progressBar.isIndeterminate())
      return null;
    //numFrames has to be an even number as defined by spec.
    int iterations = numFrames / 2 + 1;

    double boxDependent;
    double boxIndependent;

    if (progressBar.getOrientation() == JProgressBar.HORIZONTAL)
      {
	Dimension dims = getPreferredInnerHorizontal();
	boxDependent = (double) dims.width / iterations;
	boxIndependent = dims.height;
      }
    else
      {
	Dimension dims = getPreferredInnerVertical();
	boxDependent = (double) dims.height / iterations;
	boxIndependent = dims.width;
      }

    Rectangle vr = new Rectangle();
    SwingUtilities.calculateInnerArea(progressBar, vr);

    int index = getAnimationIndex();
    if (animationIndex > (numFrames + 1) / 2)
      index = numFrames - getAnimationIndex();

    if (progressBar.getOrientation() == JProgressBar.HORIZONTAL)
      {
	r.x = vr.x + (int) (index * boxDependent);
	r.y = vr.y;
	r.width = (int) boxDependent;
	r.height = (int) boxIndependent;
      }
    else
      {
	index++;
	r.x = vr.x;
	r.y = vr.height - (int) (index * boxDependent) + vr.y;
	r.width = (int) boxIndependent;
	r.height = (int) boxDependent;
      }

    return r;
  }

  /**
   * This method returns the length of the cells.
   *
   * @return The cell length.
   */
  protected int getCellLength()
  {
    return cellLength;
  }

  /**
   * This method returns the spacing between cells.
   *
   * @return The cell gap.
   */
  protected int getCellSpacing()
  {
    return cellSpacing;
  }

  /**
   * This method returns the maximum size of the JComponent.
   * If it returns null, it is up to the LayoutManager
   * to give it a size.
   *
   * @param c The component to find a maximum size for.
   *
   * @return The maximum size.
   */
  public Dimension getMaximumSize(JComponent c)
  {
    return getPreferredSize(c);
  }

  /**
   * This method returns the minimum size of the JComponent.
   * If it returns null, it is up to the LayoutManager to
   * give it a size.
   *
   * @param c The component to find a minimum size for.
   *
   * @return The minimum size.
   */
  public Dimension getMinimumSize(JComponent c)
  {
    return getPreferredSize(c);
  }

  /**
   * This method returns the preferred size of the inner
   * rectangle (the bounds without the insets) if the
   * progressBar is horizontal.
   *
   * @return The preferred size of the progressBar minus 
   *         insets if it's horizontal.
   */
  protected Dimension getPreferredInnerHorizontal()
  {
    Rectangle vr = new Rectangle();

    SwingUtilities.calculateInnerArea(progressBar, vr);

    return new Dimension(vr.width, vr.height);
  }

  /**
   * This method returns the preferred size of the inner
   * rectangle (the bounds without insets) if the 
   * progressBar is vertical.
   *
   * @return The preferred size of the progressBar minus
   *         insets if it's vertical.
   */
  protected Dimension getPreferredInnerVertical()
  {
    Rectangle vr = new Rectangle();

    SwingUtilities.calculateInnerArea(progressBar, vr);

    return new Dimension(vr.width, vr.height);
  }

  /**
   * This method returns the preferred size of the 
   * given JComponent. If it returns null, then it
   * is up to the LayoutManager to give it a size.
   *
   * @param c The component to find the preferred size for.
   *
   * @return The preferred size of the component.
   */
  public Dimension getPreferredSize(JComponent c)
  {
    // The only thing we need to worry about is
    // the text size.
    Graphics g = progressBar.getGraphics();

    Insets insets = c.getInsets();

    FontMetrics fm = g.getFontMetrics(c.getFont());

    int textW = fm.stringWidth(progressBar.getString());
    int textH = fm.getHeight();

    g.dispose();

    if (progressBar.getOrientation() == JProgressBar.HORIZONTAL)
      {
	if (textH < 20)
	  textH = 20;
	if (textW < 200)
	  textW = 200;
      }
    else
      {
	if (textH < 200)
	  textH = 200;
	if (textW < 20)
	  textW = 20;
      }
    textW += insets.left + insets.right;
    textH += insets.top + insets.bottom;
    return new Dimension(textW, textH);
  }

  /**
   * This method returns the Color that the text is shown in when the bar is
   * not over the text.
   *
   * @return The color of the text when the bar is not over it.
   */
  protected Color getSelectionBackground()
  {
    return selectionBackground;
  }

  /**
   * This method returns the Color that the text is shown in  when the bar is
   * over the text.
   *
   * @return The color of the text when the bar is over it.
   */
  protected Color getSelectionForeground()
  {
    return selectionForeground;
  }

  /**
   * This method returns the point (the top left of the bounding box)
   * where the text should be painted. 
   *
   * @param g The Graphics object to measure FontMetrics with.
   * @param progressString The string to paint.
   * @param x The x coordinate of the overall bounds box.
   * @param y The y coordinate of the overall bounds box.
   * @param width The width of the overall bounds box.
   * @param height The height of the overall bounds box.
   *
   * @return The top left of the bounding box where text should be painted.
   */
  protected Point getStringPlacement(Graphics g, String progressString, int x,
                                     int y, int width, int height)
  {
    Rectangle tr = new Rectangle();
    Rectangle vr = new Rectangle(x, y, width, height);
    Rectangle ir = new Rectangle();

    Font f = g.getFont();
    FontMetrics fm = g.getFontMetrics(f);

    SwingUtilities.layoutCompoundLabel(progressBar, fm, progressString, null,
                                       SwingConstants.CENTER,
                                       SwingConstants.CENTER,
                                       SwingConstants.CENTER,
                                       SwingConstants.CENTER, vr, ir, tr, 0);
    return new Point(tr.x, tr.y);
  }

  /**
   * This method increments the animation index.
   */
  protected void incrementAnimationIndex()
  {
    animationIndex++;
    //numFrames is like string length, it should be named numFrames or something
    if (animationIndex >= numFrames)
      animationIndex = 0;
    progressBar.repaint();
  }

  /**
   * This method paints the progressBar. It delegates its responsibilities
   * to paintDeterminate and paintIndeterminate.
   *
   * @param g The Graphics object to paint with.
   * @param c The JComponent to paint.
   */
  public void paint(Graphics g, JComponent c)
  {
    if (! progressBar.isIndeterminate())
      paintDeterminate(g, c);
    else
      paintIndeterminate(g, c);
      
    if (progressBar.isBorderPainted())
      progressBar.getBorder().paintBorder(progressBar, g, 0, 0,
                                          progressBar.getWidth(),
					  progressBar.getHeight());
  }

  /**
   * This method is called if the painting to be done is 
   * for a determinate progressBar.
   *
   * @param g The Graphics object to paint with.
   * @param c The JComponent to paint.
   */
  protected void paintDeterminate(Graphics g, JComponent c)
  {
    Color saved = g.getColor();
    int space = getCellSpacing();
    int len = getCellLength();
    int max = progressBar.getMaximum();
    int min = progressBar.getMinimum();
    int value = progressBar.getValue();

    Rectangle vr = new Rectangle();
    SwingUtilities.calculateInnerArea(c, vr);

    Rectangle or = c.getBounds();

    Insets insets = c.getInsets();

    int amountFull = getAmountFull(insets, or.width, or.height);

    g.setColor(c.getBackground());
    g.fill3DRect(vr.x, vr.y, vr.width, vr.height, false);

    if (max != min && len != 0 && value > min)
      {
	int iterations = value / (space + len);

	if (progressBar.getOrientation() == JProgressBar.HORIZONTAL)
	  {
	    double spaceInUnits = space * (double) vr.width / (max - min);
	    double lenInUnits = len * (double) vr.width / (max - min);
	    double currX = vr.x;

	    g.setColor(c.getForeground());
	    g.fill3DRect(vr.x, vr.y, amountFull, vr.height, true);

	    g.setColor(c.getBackground());
	    if (spaceInUnits != 0)
	      {
		for (int i = 0; i < iterations; i++)
		  {
		    currX += lenInUnits;
		    g.fill3DRect((int) currX, vr.y, (int) spaceInUnits,
		                 vr.height, true);
		    currX += spaceInUnits;
		  }
	      }
	  }
	else
	  {
	    double currY = vr.y;
	    double spaceInUnits = space * (double) vr.height / (max - min);
	    double lenInUnits = len * (double) vr.height / (max - min);

	    g.setColor(c.getForeground());
	    g.fill3DRect(vr.x, vr.y + vr.height - amountFull, vr.width,
	                 amountFull, true);

	    g.setColor(c.getBackground());

	    if (spaceInUnits != 0)
	      {
		for (int i = 0; i < iterations; i++)
		  {
		    currY -= lenInUnits + spaceInUnits;
		    g.fill3DRect(vr.x, (int) currY, vr.width,
		                 (int) spaceInUnits, true);
		  }
	      }
	  }
      }

    if (progressBar.isStringPainted() && !progressBar.getString().equals(""))
      paintString(g, 0, 0, or.width, or.height, amountFull, insets);
    g.setColor(saved);
  }

  /**
   * This method is called if the painting to be done is for
   * an indeterminate progressBar.
   *
   * @param g The Graphics object to paint with.
   * @param c The JComponent to paint.
   */
  protected void paintIndeterminate(Graphics g, JComponent c)
  {
    //need to paint the box at it's current position. no text is painted since
    //all we're doing is bouncing back and forth
    Color saved = g.getColor();
    Insets insets = c.getInsets();

    Rectangle or = c.getBounds();
    Rectangle vr = new Rectangle();
    SwingUtilities.calculateInnerArea(c, vr);

    g.setColor(c.getBackground());
    g.fill3DRect(vr.x, vr.y, vr.width, vr.height, false);

    Rectangle box = new Rectangle();
    getBox(box);

    g.setColor(c.getForeground());
    g.fill3DRect(box.x, box.y, box.width, box.height, true);

    if (progressBar.isStringPainted() && !progressBar.getString().equals(""))
      paintString(g, 0, 0, or.width, or.height,
                  getAmountFull(insets, or.width, or.height), insets);

    g.setColor(saved);
  }

  /**
   * This method paints the string for the progressBar.
   *
   * @param g The Graphics object to paint with.
   * @param x The x coordinate of the progressBar.
   * @param y The y coordinate of the progressBar.
   * @param width The width of the progressBar.
   * @param height The height of the progressBar.
   * @param amountFull The amount of the progressBar that has its bar filled.
   * @param b The insets of the progressBar.
   */
  protected void paintString(Graphics g, int x, int y, int width, int height,
                             int amountFull, Insets b)
  {
    // We want to place in the exact center of the bar.
    Point placement = getStringPlacement(g, progressBar.getString(),
                                         x + b.left, y + b.top,
                                         width - b.left - b.right,
                                         height - b.top - b.bottom);
    Color saved = g.getColor();

    // FIXME: The Color of the text should use selectionForeground and selectionBackground
    // but that can't be done right now, so we'll use white in the mean time.
    g.setColor(Color.WHITE);

    FontMetrics fm = g.getFontMetrics(progressBar.getFont());

    g.drawString(progressBar.getString(), placement.x,
                 placement.y + fm.getAscent());

    g.setColor(saved);
  }

  /**
   * This method sets the current animation index. If the index
   * is greater than the number of frames, it resets to 0.
   *
   * @param newValue The new animation index.
   */
  protected void setAnimationIndex(int newValue)
  {
    animationIndex = (newValue <= numFrames) ? newValue : 0;
    progressBar.repaint();
  }

  /**
   * This method sets the cell length.
   *
   * @param cellLen The cell length.
   */
  protected void setCellLength(int cellLen)
  {
    cellLength = cellLen;
  }

  /**
   * This method sets the cell spacing.
   *
   * @param cellSpace The cell spacing.
   */
  protected void setCellSpacing(int cellSpace)
  {
    cellSpacing = cellSpace;
  }

  /**
   * This method starts the animation timer. It is called
   * when the propertyChangeListener detects that the progressBar
   * has changed to indeterminate mode.
   *
   * @since 1.4
   */
  protected void startAnimationTimer()
  {
    if (animationTimer != null)
      animationTimer.start();
  }

  /**
   * This method stops the animation timer. It is called when
   * the propertyChangeListener detects that the progressBar
   * has changed to determinate mode.
   *
   * @since 1.4
   */
  protected void stopAnimationTimer()
  {
    if (animationTimer != null)
      animationTimer.stop();
    setAnimationIndex(0);
  }

  /**
   * This method changes the settings for the progressBar to
   * the defaults provided by the current Look and Feel.
   */
  protected void installDefaults()
  {
    UIDefaults defaults = UIManager.getLookAndFeelDefaults();

    progressBar.setFont(defaults.getFont("ProgressBar.font"));
    progressBar.setForeground(defaults.getColor("ProgressBar.foreground"));
    progressBar.setBackground(defaults.getColor("ProgressBar.background"));
    progressBar.setBorder(defaults.getBorder("ProgressBar.border"));
    progressBar.setOpaque(true);

    selectionForeground = defaults.getColor("ProgressBar.selectionForeground");
    selectionBackground = defaults.getColor("ProgressBar.selectionBackground");
    cellLength = defaults.getInt("ProgressBar.cellLength");
    cellSpacing = defaults.getInt("ProgressBar.cellSpacing");

    int repaintInterval = defaults.getInt("ProgressBar.repaintInterval");
    int cycleTime = defaults.getInt("ProgressBar.cycleTime");

    if (cycleTime % repaintInterval != 0
        && (cycleTime / repaintInterval) % 2 != 0)
      {
	int div = (cycleTime / repaintInterval) + 2;
	div /= 2;
	div *= 2;
	cycleTime = div * repaintInterval;
      }
    setAnimationIndex(0);
    numFrames = cycleTime / repaintInterval;
    animationTimer.setDelay(repaintInterval);
  }

  /**
   * The method uninstalls any defaults that were
   * set by the current Look and Feel.
   */
  protected void uninstallDefaults()
  {
    progressBar.setFont(null);
    progressBar.setForeground(null);
    progressBar.setBackground(null);

    selectionForeground = null;
    selectionBackground = null;
  }

  /**
   * This method registers listeners to all the 
   * components that this UI delegate needs to listen to.
   */
  protected void installListeners()
  {
    changeListener = new ChangeHandler();
    propertyListener = new PropertyChangeHandler();
    animation = new Animator();

    progressBar.addChangeListener(changeListener);
    progressBar.addPropertyChangeListener(propertyListener);
    animationTimer.addActionListener(animation);
  }

  /**
   * This method unregisters listeners to all the 
   * components that were listened to.
   */
  protected void uninstallListeners()
  {
    progressBar.removeChangeListener(changeListener);
    progressBar.removePropertyChangeListener(propertyListener);
    animationTimer.removeActionListener(animation);

    changeListener = null;
    propertyListener = null;
    animation = null;
  }

  /**
   * This method installs the UI for the given JComponent.
   * This includes setting up defaults and listeners as
   * well as initializing any values or objects that
   * the UI may need.
   *
   * @param c The JComponent that is having this UI installed.
   */
  public void installUI(JComponent c)
  {
    super.installUI(c);
    if (c instanceof JProgressBar)
      {
	progressBar = (JProgressBar) c;

	animationTimer = new Timer(200, null);
	animationTimer.setRepeats(true);

	installDefaults();
	installListeners();
      }
  }

  /**
   * This method removes the UI for the given JComponent.
   * This includes removing any listeners or defaults
   * that the installUI may have set up.
   *
   * @param c The JComponent that is having this UI uninstalled.
   */
  public void uninstallUI(JComponent c)
  {
    super.uninstallUI(c);
    uninstallListeners();
    uninstallDefaults();

    animationTimer = null;
    progressBar = null;
  }
}