path: root/javax/swing/ImageIcon.java

/* ImageIcon.java --
   Copyright (C) 2002, 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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 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
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this exception to your version of the library, but you are not
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package javax.swing;

import java.awt.Component;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.image.ImageObserver;
import java.io.Serializable;
import java.net.URL;
import java.util.Locale;

import javax.accessibility.Accessible;
import javax.accessibility.AccessibleContext;
import javax.accessibility.AccessibleIcon;
import javax.accessibility.AccessibleRole;
import javax.accessibility.AccessibleStateSet;

/**
 * An {@link Icon} implementation that is backed by an {@link Image}.
 *
 * @author original author unknown
 */
public class ImageIcon
  implements Icon, Serializable, Accessible
{
  /**
   * Accessibility support for ImageIcon.
   */
  protected class AccessibleImageIcon
    extends AccessibleContext
    implements AccessibleIcon, Serializable
  {
    private static final long serialVersionUID = 2113430526551336564L;

    /**
     * Creates a new instance of AccessibleImageIcon.
     */
    protected AccessibleImageIcon()
    {
    }

    /**
     * Returns the AccessibleRole of ImageIcon, which is
     * {@link AccessibleRole#ICON}.
     *
     * @return {@link AccessibleRole#ICON}
     */
    public AccessibleRole getAccessibleRole()
    {
      return AccessibleRole.ICON;
    }

    /**
     * Returns the accessible state of this ImageIcon.
     *
     * @return the accessible state of this ImageIcon
     */
    public AccessibleStateSet getAccessibleStateSet()
    {
      // TODO: which state information from ImageIcon is returned here??
      return new AccessibleStateSet();
    }

    /**
     * Returns the accessible parent of this object, which is <code>null</code>
     * in this case, because ImageIcons have no parent.
     *
     * @return <code>null</code>, because ImageIcons have no parent
     */
    public Accessible getAccessibleParent()
    {
      // TODO: ImageIcons have no parent, have they ??
      return null;
    }

    /**
     * Returns the index of this object in its accessible parent, which is
     * -1 here, because ImageIcons have no accessible parent.
     *
     * @return -1 because ImageIcons have no parent
     */
    public int getAccessibleIndexInParent()
    {
      // TODO: do ImageIcons have parents??
      return -1;
    }

    /**
     * Returns the number of accessible children of this component,
     * which is 0, because ImageIcons have no children.
     *
     * @return 0 because ImageIcons have no children
     */
    public int getAccessibleChildrenCount()
    {
      return 0;
    }

    /**
     * Returns the accessible child at index <code>i</code>, which is
     * <code>null</code> in this case because ImageIcons have no children.
     *
     * @param i the index of the child to be fetched
     *
     * @return <code>null</code> because ImageIcons have no children
     */
    public Accessible getAccessibleChild(int i)
    {
      return null;
    }

    /**
     * Returns the locale of this object. This returns the default locale
     * that is set for the current VM.
     *
     * @return the locale of this object
     */
    public Locale getLocale()
    {
      return Locale.getDefault();
    }

    /**
     * Returns the accessible Icon description. This returns the
     * actual 'description' property of the ImageIcon.
     *
     * @return the accessible Icon description
     */
    public String getAccessibleIconDescription()
    {
      return getDescription();
    }

    /**
     * Sets the accessible Icon description. This sets the
     * actual 'description' property of the ImageIcon.
     *
     * @param newDescr the description to be set
     */
    public void setAccessibleIconDescription(String newDescr)
    {
      setDescription(newDescr);
    }

    /**
     * Returns the icon height. This returns the iconHeight property of
     * the underlying Icon.
     *
     * @return the icon height
     */
    public int getAccessibleIconHeight()
    {
      return getIconHeight();
    }
    
    /**
     * Returns the icon width. This returns the iconWidth property of
     * the underlying Icon.
     *
     * @return the icon width
     */
    public int getAccessibleIconWidth()
    {
      return getIconWidth();
    }
  } // AccessibleIcon

  private static final long serialVersionUID = 532615968316031794L;

  /** A dummy Component that is used in the MediaTracker. */
  protected static Component component = new Component(){};

  /** The MediaTracker used to monitor the loading of images. */
  protected static MediaTracker tracker = new MediaTracker(component);

  /** The ID that is used in the tracker. */
  private static int id;

  Image image;
  String description;
  ImageObserver observer;

  /** The image loading status. */
  private int loadStatus;

  /** The AccessibleContext of this ImageIcon. */
  private AccessibleContext accessibleContext;

  public ImageIcon()
  {
  }
  
  public ImageIcon(String file)
  {
    this(file, file);
  }

  public ImageIcon(String file, String description)
  {
    this(Toolkit.getDefaultToolkit().getImage(file), description);
  }

  public ImageIcon(byte[] imageData)
  {
    this(imageData, null);
  }
  
  public ImageIcon(byte[] imageData, String description)
  {
    this(Toolkit.getDefaultToolkit().createImage(imageData), description);
  }

  public ImageIcon(URL url)
  {
    this(url, null);
  }

  public ImageIcon(URL url, String description)
  {
    this(Toolkit.getDefaultToolkit().getImage(url), description);
  }

  public ImageIcon(Image image)
  {
    this(image, null);
  }

  public ImageIcon(Image image, String description)
  {
    setImage(image);
    setDescription(description);
  }
    
  public ImageObserver getImageObserver()
  {
    return observer;
  }
  
  public void setImageObserver(ImageObserver newObserver)
  {
    observer = newObserver;
  }

  public Image getImage()
  {
    return image;
  }

  public void setImage(Image image)
  {
    loadImage(image);
    this.image = image;
  }

  public String getDescription()
  {
    return description;
  }

  public void setDescription(String description)
  {
    this.description = description;
  }

  public int getIconHeight()
  {
    return image.getHeight(observer);
  }

  public int getIconWidth()
  {
    return image.getWidth(observer);
  }

  public void paintIcon(Component c, Graphics g, int x, int y)
  {
    g.drawImage(image, x, y, observer != null ? observer : c);
  }

  /**
   * Loads the image and blocks until the loading operation is finished.
   *
   * @param image the image to be loaded
   */
  protected void loadImage(Image image)
  {
    try
      {
        tracker.addImage(image, id);
        id++;
        tracker.waitForID(id - 1);
      }
    catch (InterruptedException ex)
      {
        ; // ignore this for now
      }
    finally
      {
        loadStatus = tracker.statusID(id - 1, false);
      }
  }

  /**
   * Returns the load status of the icon image.
   *
   * @return the load status of the icon image
   *
   * @see MediaTracker#COMPLETE
   * @see MediaTracker#ABORTED
   * @see MediaTracker#ERRORED
   */
  public int getImageLoadStatus()
  {
    return loadStatus;
  }

  /**
   * Returns the AccessibleContext for this ImageIcon.
   *
   * @return the AccessibleContext for this ImageIcon
   */
  public AccessibleContext getAccessibleContext()
  {
    if (accessibleContext == null)
      accessibleContext = new AccessibleImageIcon();
    return accessibleContext;
  }
}