basicprogressbarui.java

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/* 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
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
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
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


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);
  }